WO2020080532A1 - Armrest, backrest, and chair - Google Patents

Armrest, backrest, and chair Download PDF

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Publication number
WO2020080532A1
WO2020080532A1 PCT/JP2019/041121 JP2019041121W WO2020080532A1 WO 2020080532 A1 WO2020080532 A1 WO 2020080532A1 JP 2019041121 W JP2019041121 W JP 2019041121W WO 2020080532 A1 WO2020080532 A1 WO 2020080532A1
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WO
WIPO (PCT)
Prior art keywords
main body
armrest
groove
armrest main
protruding piece
Prior art date
Application number
PCT/JP2019/041121
Other languages
French (fr)
Japanese (ja)
Inventor
益永　浩
俊介 石丸
Original Assignee
株式会社オカムラ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社オカムラ filed Critical 株式会社オカムラ
Publication of WO2020080532A1 publication Critical patent/WO2020080532A1/en

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/54—Supports for the arms

Definitions

  • the present invention relates to armrests, backrests and chairs.
  • the present application claims priority based on Japanese Patent Application No. 2018-197757 filed on October 19, 2018 in Japan, and the content thereof is incorporated herein.
  • an armrest of a chair As an armrest of a chair, an armrest having an armrest main body on which a seated person rests his / her arm, and an armrest main body support portion supported by a support structure of the chair and attached to the armrest main body so as to be able to move up and down is known (for example, See Patent Documents 1 and 2.
  • the armrest main body includes an elbow rest on which a seated person places an elbow, a vertically extending rod-shaped sliding member connected to a lower side of the elbow rest, and an armrest. And a tubular cover portion that is connected to the sliding member and that extends in the up-down direction and that covers the periphery of the sliding member.
  • the armrest main body support portion is provided on the outside of the cover portion and is attached to a support structure of a chair or a backrest, and the attachment member is provided inside the cover portion via a groove portion formed in the cover member.
  • a guide member to be connected The guide member is formed with a hole opening upward and extending in the vertical direction, into which the sliding member is vertically movable.
  • the guide member is configured to be able to lock the sliding member at a plurality of locations in the vertical direction.
  • the armrest main body has an elbow rest on which a seated person rests his elbow, and a sliding member connected to the rear side of the elbow rest.
  • the armrest body support part has a guide member attached to the backrest of the chair.
  • the guide member is formed with a groove portion which is opened laterally and extends in the vertical direction and into which the sliding member is vertically movable.
  • the guide member is configured to be able to lock the sliding member at a plurality of locations in the vertical direction.
  • the sliding member is similarly locked to the guide member regardless of whether the elbow rest is installed in the upper position or in the lower position.
  • the vertical dimension of the guide member is set larger than the vertical dimension of the sliding member, when the elbow rest is installed in the upper position, the lower side of the guide member is exposed and the elbow rest is If it is installed at the lower position, the upper side of the guide member may be exposed and the designability may be degraded.
  • the present invention provides an armrest, a backrest, and a chair in which the armrest main body supported by the armrest main body support portion so as to be able to move up and down is installed in a stable state at any height, and the designability can be improved.
  • the purpose is to provide.
  • an armrest according to a first aspect of the present invention is an armrest main body on which a seated person rests an elbow, and an armrest supported by a support structure of a chair so that the armrest main body can be vertically moved up and down.
  • a main body support portion, the armrest main body support portion includes a first engaging portion, and the armrest main body extends in the up-down direction and is located between the upper end portion and the lower end portion.
  • a second engaging portion that is locked to the first engaging portion so as to be slidable in the vertical direction, and the first engaging portion that locks the second engaging portion and the second engaging portion.
  • a cover portion that covers the joint portion.
  • a backrest according to a second aspect of the present invention includes a backrest body on which a seated person leans his back, and an armrest according to the first aspect, wherein the armrest body is the backrest body. It is arranged outside in the width direction.
  • the chair according to the third aspect of the present invention has the armrest of the first aspect.
  • the armrest main body when the armrest main body moves up and down with respect to the armrest main body support portion, the first engagement portion of the armrest main body engages with the second engagement portion of the armrest main body support portion.
  • the armrest main body support is always supported not only on the upper side and the lower side of the section but also in the entire vertical direction. Accordingly, the armrest main body can be installed in a stable state at any height with respect to the armrest main body support portion.
  • the first engaging portion and the second engaging portion are arranged inside the cover portion, the engaging portion between the first engaging portion and the second engaging portion is exposed to the outside of the cover portion. Can be prevented, safety can be improved without concern that a person or an object may contact the engaging portion between the first engaging portion and the second engaging portion, and designability can be improved. be able to.
  • the armrest according to the first aspect of the present invention has a height position fixing portion capable of fixing the second engaging portion at a plurality of vertical positions with respect to the first engaging portion,
  • the height position fixing portion may be arranged inside the cover portion.
  • the first engaging portion is a slide of the second engaging portion in which the first engaging portion is arranged between the upper end portion and the lower end portion of the second engaging portion.
  • An upper side restricting portion that restricts a movement above the movable range and a lower side restricting portion that restricts a movement of the second engaging portion below the slidable range;
  • the restriction part and the lower restriction part may be connected to the cover part.
  • the armrest main body supported by the armrest main body support portion so as to be able to move up and down is installed in a stable state at any height, and the designability can be improved.
  • FIG. 1 is a front view of a chair according to an embodiment of the present invention.
  • FIG. 3 is a rear view of the chair according to the embodiment of the present invention.
  • It is a perspective view showing a connecting structure of a backrest support portion and an outer peripheral frame portion.
  • It is a perspective view of a backrest support part.
  • FIG. 5 is a sectional view taken along line AA of FIG. 4.
  • FIG. 5 is a sectional view taken along line BB of FIG. 4.
  • FIG. 5 is a sectional view taken along line CC of FIG. 4.
  • FIG. 5 is a sectional view taken along the line DD of FIG. 4. It is the perspective view seen from the diagonal front of the peripheral frame part.
  • FIG. 19 is a sectional view taken along line HH of FIG. 18.
  • FIG. 13 is a sectional view taken along line II of FIG. 12. It is a figure explaining the mode that the rail member and the front side member and the back side member were connected. It is a figure which shows a mode that the lower inner plate part was attached. It is a figure which shows a mode that the main-body part of the cover was attached. It is a figure explaining the armrest main body in the uppermost position. It is a figure explaining the armrest main body in the uppermost position.
  • the chair 1 includes a support structure 2, a seat portion 3, and a backrest 4.
  • the direction in which a seated person sitting on the chair 1 faces forward is the front side
  • the opposite side is the rear side
  • the horizontal direction connecting the front side and the rear side is the front-back direction.
  • the horizontal direction orthogonal to the front-rear direction is the width direction.
  • the chair 1 has a shape symmetrical in the width direction.
  • widthwise outsides both widthwise ends of the entire chair 1 with respect to the center of the widthwise direction are referred to as “widthwise outsides”, and the widthwise center side with respect to the widthwise ends is referred to as “widthwise insides”.
  • widthwise insides Sometimes (see FIGS. 2 and 3).
  • the support structure 2 includes a leg 21, a pillar 22, a support base 23, and a backrest support portion 24.
  • the leg 21 has a plurality of leg rods 211 arranged radially in a plan view.
  • a caster 212 is provided at the tip of each leg rod 211 for grounding on the floor surface.
  • the pedestal 22 is erected at the center of the leg body 21.
  • the pedestal 22 is a telescopic type having a built-in gas spring, and has an outer cylinder 221 fixed to the leg 21 and an inner cylinder 222 inserted into the outer cylinder 221 and extending above the outer cylinder 221. There is.
  • the inner cylinder 222 is configured to be movable up and down with respect to the outer cylinder 221, and is configured to be rotatable relative to the outer cylinder 221.
  • the support base 23 is fixed to the upper end of the pedestal 22.
  • the seat portion 3 is arranged above the support base 23, and the backrest support portion 24 is arranged behind the support base 23.
  • the support base 23 tiltably (rotatably) supports a backrest support portion 24 that supports the backrest 4, and the seat portion 3 that forms a seating surface can be tilted in conjunction with the backrest support portion 24. I support you.
  • the backrest support portion 24 includes a lower frame 241 connected to the support base 23 (see FIGS. 1 to 3) and extending rearward from the support base 23, and a lower frame 241. And a rear frame 242 that extends upward from the rear end portion.
  • the lower frame 241 and the rear frame 242 are integrally formed.
  • the backrest support portion 24 has an L shape in a side view as seen from the width direction.
  • the lower frame 241 connects the pair of rear extending portions 243, which extend in the front-rear direction and are arranged at intervals in the width direction, and the middle portion of the pair of rear extending portions 243 in the front-rear direction, to each other. And a connecting portion 244.
  • the rear extending portion 243 on one side in the width direction of the pair of rear extending portions 243 has a front end portion connected to one side in the width direction of the support base 23, and the rear extending portion 243 on the other side in the width direction. Has a front end connected to the other side of the support base 23 in the width direction.
  • the rear frame 242 has a pair of upper extension portions 245 extending from the rear end portions of the pair of rear extension portions 243 toward the upper side in an upward direction and upper end portions of the pair of upper extension portions 245. And an upper coupling portion 246 that couples with each other.
  • the upper connecting portion 246 is curved so that the center in the width direction is recessed rearward over the entire width direction.
  • the pair of upward extending portions 245 are provided at intervals in the width direction.
  • One upper extension portion 245 of the pair of upper extension portions 245 is located closer to one side in the width direction than the center of the chair 1 in the width direction, and the other upper extension portion 245 is the width of the chair 1. It is located on the other side in the width direction than the center in the direction. Therefore, in the pair of upward extending portions 245, the sides facing each other are the inner sides in the width direction, and the sides separated from each other are the outer sides in the width direction.
  • the pair of upward extending portions 245 are formed in a rod shape extending from the lower side to the upper side in the direction toward the front side gradually, and the connecting portion 5 to which the backrest 4 is fixed, and the rear edge portion 57 of the connecting portion 5 from the width direction. And a projecting plate portion 26 projecting to the outside.
  • the connecting portion 5 is appropriately formed with a groove-shaped, concave-shaped, or hole-shaped lightening portion.
  • the outer peripheral surface of the connecting portion 5 has a connecting portion front surface 51 with a surface facing substantially forward, a connecting portion rear surface 52 with a surface facing substantially rearward, a connecting portion inner surface 53 with a surface facing generally inward in the width direction, and a substantially width direction.
  • the outer surface of the connecting portion is formed of the connecting portion outer surface 54.
  • the "face facing the ..” and the "face facing the .. direction” refer to faces whose normals extend in the ".. side" or "in the .. direction".
  • the connecting portion rear surface 52 is formed on a surface that gradually extends from the lower side to the upper side toward the front side and gradually extends from the outer side to the inner side in the width direction toward the rear side.
  • the rear surface 52 of the connecting portion is continuous with the rear surface of the upper connecting portion 246 without corners or steps.
  • the connecting portion front surface 51 is formed on a surface that gradually extends from the lower side to the upper side toward the front side and gradually extends from the outer side to the inner side in the width direction toward the rear side.
  • the front surface 51 of the connecting portion is substantially parallel to the rear surface 52 of the connecting portion.
  • the inner side surface 53 of the connecting portion is formed such that the vicinity of the rear end portion is slightly facing the inner side in the width direction, and the front portion thereof is formed in the surface facing the inner side in the width direction.
  • the connecting portion outer surface 54 is formed on a surface that gradually extends inward in the width direction from the rear side to the front side.
  • the connecting portion outer surface 54 is a surface that is substantially orthogonal to the connecting portion rear surface 52 and the connecting portion front surface 51. The size of the connecting portion 5 gradually decreases from the rear side to the front side.
  • Two first hole portions 55 into which the first bolts 61 (see FIGS. 6 and 7) for fixing the backrest body 41 of the backrest 4 are inserted, are formed in the connecting portion 5 at intervals in the vertical direction.
  • Two second hole portions 56 into which the second bolts 62 (see FIGS. 8 and 9) for fixing the armrest main body support portion 72 of the backrest 4 are inserted, are formed at intervals in the vertical direction.
  • the two second hole portions 56 are formed between the two first hole portions 55.
  • front concave portions 551 that open to the front and two concave portions that are located on the rear side of the front concave portions 551 and open to the rear side are provided at two places vertically spaced apart from each other.
  • a rear concave portion 552 which is formed.
  • the front concave portion 551 and the rear concave portion 552 are arranged side by side substantially in the front-rear direction with the intermediate plate portion 553 interposed therebetween.
  • the intermediate plate portion 553 is formed in a plate shape whose plate surface faces the front-rear direction, and has a hole portion penetrating in the front-rear direction in the central portion in a front view. This hole is the first hole 55.
  • the connecting portion 5 has a notch portion 554 formed in an upper portion of the front concave portion 551 located on the upper side, and the inside of the front concave portion 551 communicates with the upper portion of the connecting portion 5 via the notch portion 554. Is configured.
  • the notch 554 is located above the widthwise outer portion of the front recess 551.
  • two first hole portions 55 are provided at two places vertically spaced apart from each other, and are provided on the inner side in the width direction.
  • An inner concave portion 561 that opens is formed.
  • the inner concave portion 561 is also open rearward.
  • a bottom surface 562 of the inner recessed portion 561 is formed on a surface that gradually extends outward in the width direction from the front side toward the rear side.
  • a bottom surface 562 of the inner concave portion 561 is arranged in parallel with the connecting portion outer surface 54.
  • the connecting portion 5 is formed with a hole penetrating from the bottom surface 562 of the inner concave portion 561 to the connecting portion outer surface 54. This hole is the second hole 56.
  • the second hole portion 56 penetrates the connecting portion 5 in an oblique direction from the inner side to the outer side in the width direction and gradually toward the front side.
  • the penetrating direction of the second hole portion 56 is a direction along the connecting portion front surface 51 and the connecting portion rear surface 52, and is a first oblique direction that gradually advances from the inner side to the outer side in the width direction toward the front side.
  • the first diagonal direction indicates a direction from the inner side to the outer side in the width direction gradually toward the front side, and a direction opposite to the opposite direction from the outer side to the inner side in the width direction gradually toward the rear side.
  • the first diagonal direction is substantially horizontal.
  • the side that gradually progresses from the inner side to the outer side in the first diagonal direction toward the outer side is defined as the outer side, and the side that gradually faces the inner side from the outer side in the width direction toward the inner side toward the rear side is defined as the inner side.
  • the protruding plate portion 26 is formed in a plate shape protruding in the first oblique direction from the rear edge portion 57 of the connecting portion 5, and the surface thereof is curved to the upper connecting portion 246. It is a surface along.
  • the rear surface 261 of the projecting plate portion 26 is smoothly continuous with the rear surface 52 of the connecting portion without any step or bent portion 462.
  • the front surface 262 of the projecting plate portion 26 is located rearward of the second hole portion 56. Thereby, the projecting plate portion 26 is configured not to interfere with the second hole portion 56.
  • the projecting plate portion 26 has a shorter dimension that projects outward from the connecting portion 5 in the width direction from the upper side to the lower side, and the dimension of the plate surface in the width direction gradually decreases from the upper side to the lower side. It has a triangular shape.
  • the backrest 4 is disposed on the front side of the rear frame 242 of the backrest support portion 24.
  • the backrest 4 has a backrest main body 41 on which the seated person leans his back, and an armrest 7 arranged outside the backrest main body 41 in the width direction and on which the seated person rests his elbow.
  • the backrest main body 41 has a rectangular frame-shaped outer peripheral frame portion 42 having an opening 421 formed therein, and a face material 43 that covers the opening 421 and is locked to the outer peripheral frame portion 42 (see FIGS. 1 to 3). And have. In FIG. 4, the face material 43 is omitted.
  • the face material 43 is formed of a film-shaped member such as a mesh or a cloth, is formed to be larger than the front view shape of the outer peripheral frame portion 42 as viewed from the front side, and has an outer edge portion locked to the outer peripheral frame portion 42. .
  • the outer peripheral frame portion 42 has an upper frame portion 44, a lower frame portion 45, and a pair of vertical frame portions 46.
  • the pair of vertical frame portions 46 are provided at intervals in the width direction.
  • One vertical frame portion 46 of the pair of vertical frame portions 46 is located on one side in the width direction with respect to the widthwise center of the chair 1, and the other vertical frame portion 46 is the widthwise center of the chair 1. It is located on the other side in the width direction. Therefore, in the pair of vertical frame portions 46, the sides facing each other are the inside in the width direction, and the sides separated from each other are the outside in the width direction.
  • the upper frame portion 44 is a member that extends in the width direction, and extends over the entire width direction such that the center in the width direction projects upward in a front view and the center in the width direction projects rearward in a plan view seen from above. It is curved.
  • the upper frame portion 44 is formed with an upper frame surface material locking groove portion 441 that locks an upper edge portion of the surface material 43 (see FIGS. 1 to 3).
  • the upper frame surface material locking groove portion 441 is a groove portion that opens upward and is formed over the entire width direction of the upper frame portion 44.
  • the lower frame portion 45 is a member extending in the width direction, and is curved over the entire width direction such that the center in the width direction projects downward in a front view and the center in the width direction projects rearward in a plan view.
  • a lower frame surface material locking groove portion 451 that locks the lower edge portion of the surface material 43 is formed.
  • the lower frame surface material locking groove portion 451 is a groove portion that opens downward and is formed over the entire width direction of the lower frame portion 45.
  • the pair of vertical frame portions 46 has a bent portion 462 formed at an intermediate portion in the vertical direction.
  • the pair of vertical frame portions 46 in a side view seen from the width direction, a portion below the bending portion 462 extends in a direction from the lower side to the upper side gradually toward the front side, and a portion above the bending portion 462. Extends from the lower side to the upper side in a direction gradually toward the rear side.
  • the lower side of the bent portion 462 extends in a direction from the lower side to the upper side gradually toward the outer side in the width direction in a front view, and the upper side of the bent portion 462 extends from the lower side to the upper side.
  • the bent portion 462 is located below the vertical center of each of the pair of vertical frame portions 46.
  • the pair of vertical frame portions 46 are respectively formed with a face material locking portion 463 that locks the face material 43 and the face material locking portion 463, and is fixed to the backrest support portion 24. It has a portion 464 and a rib 465 protruding rearward from the surface material locking portion 463.
  • the face material locking portion 463 is provided over the entire vertical direction of the vertical frame portion 46, and the upper end portion is connected to the upper frame portion 44 and the lower end portion is connected to the lower frame portion 45.
  • the face material locking portion 463 of one vertical frame portion 46 of the pair of vertical frame portions 46 has an upper end portion connected to one end portion in the width direction of the upper frame portion 44, and a lower end portion being a lower frame portion. It is connected to one end portion of the width direction 45.
  • the face material locking portion 463 of the other vertical frame portion 46 of the pair of vertical frame portions 46 has an upper end portion connected to the other end portion in the width direction of the upper frame portion 44 and a lower end portion that is a lower frame portion. It is connected to the other end of the width direction 45.
  • a vertical frame surface material locking groove portion 461 for locking the side edge portion of the surface material 43 is formed in the surface material locking portion 463.
  • the vertical frame surface member locking groove portion 461 is a groove portion that opens inward in the width direction and is formed over the entire vertical direction.
  • the pair of vertical frame surface material locking groove portions 461 are respectively continuous with the upper frame surface material locking groove portion 441 and the lower frame surface material locking groove portion 451.
  • the outer peripheral frame portion 42 is formed with a groove portion for locking the face material 43 over the entire outer peripheral portion.
  • the backrest connecting portion 464 is provided in the entire portion of the vertical frame portion 46 below the bending portion 462.
  • the backrest connecting portion 464 is provided inside the face material locking portion 463 in the width direction.
  • the lower end of the backrest connecting portion 464 is connected to the lower frame portion 45.
  • the backrest connecting portion 464 includes a connecting plate portion 47 that gradually extends rearward inward in the width direction from a rear edge portion of a portion below the bending portion 462 of the face material locking portion 463, and a connecting plate portion 47.
  • a connecting protrusion 48 that protrudes to the rear side.
  • the connecting plate portion 47 is formed in an elongated shape extending in the vertical direction, and the lower end portion is connected to the lower frame portion 45.
  • the connecting plate part front surface 471 that faces the front is a surface that faces slightly inward in the width direction rather than the front side in the front-rear direction
  • the connecting plate part rear surface 472 that faces rearward is slightly in the width direction than the rear side in the front-rear direction. It is a surface that faces the outside of.
  • the connecting plate part 47 is formed in a shape along the lower frame part 45 in a plan view.
  • the connecting protrusion 48 has a tubular portion 481 protruding rearward from the connecting plate portion 47, and a tip plate connected to cover the tip portion (rear end portion) of the tubular portion 481. And a portion 482.
  • the tip plate portion 482 is formed in a flat plate shape with its plate surface facing the front-rear direction, and has a third hole portion 483 penetrating in the front-rear direction in the center of the plate surface.
  • the connecting protrusion 48 is formed in a shape that fits into the front recess 551 of the connecting portion 5 of the backrest support 24 from the front side.
  • the connecting protrusion 48 is set such that the third hole 483 overlaps with the first hole 55 of the front recess 551 in the front-rear direction when fitted into the front recess 551 of the connecting portion 5 of the backrest support 24. .
  • the rib 465 is provided in the vertical middle portion of the vertical frame portion 46 and in the portion including the bent portion 462 and the regions above and below the bent portion 462.
  • the rib 465 is formed in a plate shape whose plate surface faces the width direction.
  • the lower end of the rib 465 is connected to the side surface of the tubular portion 481 of the connecting protrusion 48 arranged on the upper side.
  • a cutout portion 466 that opens rearward and downward is formed on the lower side of the rib 465.
  • the surface material 43 is stretched on the front side of the vertical frame portion 46 so as to cover the inner side of the outer peripheral frame portion 42, and the upper frame portion 44, the lower frame portion 45 and the pair of vertical frame portions are provided.
  • the front surface of 46 is rolled up, and the outer edge portion is inserted into the surface material locking groove portions 441, 451 and 461 and locked to the outer peripheral frame portion 42.
  • the face member 43 is formed, and the face on which the seated person leans his back is referred to as a backrest face 431.
  • the backrest surface 431 is curved so that the center in the width direction is recessed more rearward than the outer end portion in the width direction.
  • the face material 43 stretched over the outer peripheral frame portion 42 is configured to be elastically deformable by the load applied from the front.
  • the outer peripheral frame portion 42 is also configured to be elastically deformable by the load acting on the face material 43.
  • the outer peripheral frame portion 42 is fixed to the backrest support portion 24 in a state where the face material 43 is stretched.
  • the outer peripheral frame portion 42 is fixed to the front side of the rear frame 242 of the backrest support portion 24.
  • the backrest connecting portion 464 of the pair of vertical frame portions 46 is arranged on the front side of the connecting portion 5 of the upper extension portion 245 in the rear frame 242.
  • the connecting plate portion 47 of the backrest connecting portion 464 the connecting plate portion rear surface 472 is in contact with the connecting portion front surface 51 of the connecting portion 5.
  • the connecting protrusion 48 of the backrest connecting portion 464 is inserted into the front recess 551 of the connecting portion 5.
  • the outer peripheral frame portion 42 is connected to the backrest support portion 24 by fastening the first bolt 61 inserted through the nut to the nut.
  • the ribs 465 of the pair of vertical frame portions 46 have lower end portions which are continuous with the upper connecting protrusions 48 and which are inserted into notch portions 554 formed on the upper side of the front concave portion 551 of the connecting portion 5, and which are lower than the lower end portions.
  • the upper portion is arranged above the connecting portion 5.
  • the face material 43 is attached to the outer peripheral frame portion 42.
  • the backrest connecting portion 464 of the pair of vertical frame portions 46 of the outer peripheral frame portion 42 is arranged on the front side of the connecting portion 5 of the upper extending portion 245 in the rear frame 242. Then, the connecting plate portion rear surface 472 of the connecting plate portion 47 of the backrest connecting portion 464 is brought into contact with the connecting portion front surface 51 of the connecting portion 5. Further, the connecting protrusion 48 of the backrest connecting portion 464 is inserted into the front recess 551 of the connecting portion 5.
  • the portion 55 overlaps with the front-rear direction, and the first bolt 61 is inserted into the first hole portion 55 and the third hole portion 483 and fastened with the nut 63.
  • the backrest body 41 is connected to the backrest support portion 24.
  • the nut 63 may be fixed inside the connecting protrusion 48.
  • a concave portion 27 is formed which is surrounded by the face material locking portion 463 of the vertical frame portion 46 of 41 and extends substantially in the vertical direction and which is open to the outside in the first diagonal direction.
  • the armrest main body support portion 72 of the armrest 7 is inserted into the recess 27.
  • the armrest 7 includes an armrest main body 71 on which a seated person rests his / her arm, an armrest main body support portion 72 fixed to the backrest support portion 24 to support the armrest main body 71 so that the armrest main body 71 can be lifted and lowered, And a cover member 73 that covers the main body support portion 72.
  • the armrest main body support portion 72 is a long block-shaped member that extends in the substantially vertical direction, and a long block-shaped member that extends in the substantially vertical direction. And a rear member 75 connected to the rear side of the front member 74.
  • the front member 74 and the rear member 75 are each formed of a metal such as an aluminum alloy, and are connected by a connecting tool (not shown) such as a bolt.
  • the front member 74 and the rear member 75 correspond to the first locking portion of the present invention.
  • the armrest main body support portion 72, to which the front member 74 and the rear member 75 are connected, has a shape extending in the first diagonal direction when viewed in the vertical direction.
  • the front member 74 includes a front connecting portion 741 located on the inner side in the first diagonal direction and a front side protruding from the front portion of the front connecting portion 741 toward the outer side in the first diagonal direction. And a projecting piece 742.
  • the front surface (referred to as the front surface 741a) of the front connecting portion 741 and the front surface (referred to as the front surface 742a) of the front protruding piece 742 are respectively formed on surfaces that are slightly inward in the width direction rather than the front side in the front-rear direction. Has been done.
  • the front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742 are formed on a surface along the first diagonal direction.
  • a direction orthogonal to the front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742, which is orthogonal to the first diagonal direction, is referred to as a second diagonal direction.
  • the side slightly inward in the width direction relative to the front side in the front-rear direction is defined as the front side
  • the opposite side to the side slightly outward in the width direction relative to the rear side in the front-rear direction is defined as the rear side.
  • the front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742 face the front side in the second diagonal direction.
  • the front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742 are arranged flush with each other.
  • a first step portion 741c is formed at an intermediate portion in the first oblique direction, and the first step portion 741c is formed at a position closer to the first step portion 741c.
  • the outer portion 741d which is the outer side in one diagonal direction, is located in front of the inner portion 741e, which is the inner side in the first diagonal direction, with respect to the first step portion 741c.
  • the outer portion 741d and the inner portion 741e on the rear surface 741b of the front connecting portion 741 are both formed on a surface facing the rear side in the second diagonal direction.
  • a rear-facing surface (referred to as a rear surface 742b) of the front protruding piece 742 is formed on a surface facing the rear side in the second diagonal direction.
  • the rear surface 742b of the front protruding piece 742 is located on the front side of the outer portion 741d on the rear surface of the front coupling portion 741.
  • a second step portion 742c is formed between the rear surface 742b of the front protruding piece 742 and the rear surface 741b of the front connecting portion 741.
  • the inner side surface of the front connecting portion 741 in the first diagonal direction (referred to as the first side surface 741f) is formed on the surface facing the inner side in the first diagonal direction.
  • the front connecting portion 741 is provided with a concave fourth hole portion 743 that is open inward in the first diagonal direction at a portion inside the first diagonal direction. Threads are formed on the peripheral surface of the fourth hole 743.
  • the fourth hole portions 743 are provided in two places at intervals in the vertical direction.
  • the rear member 75 has a flat plate shape.
  • the front surface of the rear member 75 (referred to as the front surface 75a) is formed on the front surface in the second diagonal direction.
  • the rear-facing surface of the rear member 75 (referred to as the rear surface 75b) is formed on the rear-facing surface in the second diagonal direction.
  • the rear member 75 has an inner end 75c in the first diagonal direction located on the first step 741c of the front member 74, and projects rearward in the first diagonal direction more than the front connecting portion 741 of the front member 74. Is located in.
  • the rear member 75 is disposed on the rear side of the front coupling portion 741 and is coupled to the front coupling portion 741, and the rear coupling portion 751 and the rear coupling portion 751.
  • the rear side protruding piece 752 that protrudes outward in the first diagonal direction from the portion 741 is included.
  • the inner edge of the rear connecting portion 751 in the first oblique direction is along the first step portion 741c of the front connecting portion 741 of the front member 74, and the rear connecting portion
  • the portion 751 is connected to the front member 74 in a state of being arranged outside the first step portion 741c in the first diagonal direction.
  • the front projecting piece 742 and the rear projecting piece 752 are arranged in parallel in the second diagonal direction with a space therebetween.
  • the armrest main body support portion 72 is formed with an up-and-down groove portion 744 sandwiched between the front side protruding piece 742 and the rear side protruding piece 752 outside the front side connecting portion 741 in the first oblique direction.
  • the front-side connecting portion 741 of the front-side member 74 and the rear-side connecting portion 751 of the rear-side member 75, which are connected, are combined to form a first base portion 721. Further, the front-side member 74 and the rear-side member 75 that are connected to each other are the portions that form the elevating / lowering groove portion 744 (the end surfaces of the front-side protruding piece 742, the rear-side protruding piece 752, and the front-side connecting portion 741 in the first diagonal direction). ) Are combined to form the up-and-down groove forming portion 723 (first engaging portion).
  • the front surface 721a of the first base portion 721 indicates the front surface 741a of the front connecting portion 741
  • the rear surface 721b of the first base portion 721 is the rear surface 751b of the inner portion 741e and the rear connecting portion 751 of the rear surface 741b of the front connecting portion 741
  • the upper surface 721c of the first base portion 721 shows the upper surfaces of the front connecting portion 741 and the rear connecting portion 751
  • the lower surface 721d of the first base portion 721 shows the lower surfaces of the front connecting portion 741 and the rear connecting portion 751.
  • the first side surface 721e on the inner side in the first diagonal direction of the first base portion 721 indicates the first side surface 741f of the front connecting portion 741.
  • the front surface 742b of the front protruding piece 742 is formed with a first front protruding piece groove portion 745 extending in the vertical direction and a second front protruding piece groove portion 746 extending in the vertical direction.
  • the first front protruding piece groove portion 745 and the second front protruding piece groove portion 746 are arranged such that the first front protruding piece groove portion 745 is spaced apart from the second front protruding piece groove portion 746 in the first diagonal direction.
  • the first front-side protruding piece groove portion 745 and the second front-side protruding piece groove portion 746 each open to the rear side in the second diagonal direction.
  • the first front-side protruding piece groove portion 745 is formed at two places with an interval in the vertical direction.
  • the two first front protruding piece groove portions 745 are formed in substantially the same shape.
  • the first front protruding piece groove portion 745 includes a round groove portion 745c that extends in the vertical direction, an upper groove portion 745d that is provided continuously to the upper end portion of the round groove portion 745c, and has a groove width larger than the groove width of the round groove portion 745c, and the round groove portion 745c.
  • a lower groove portion 745e which is provided continuously to the lower end portion of which has a groove width larger than the groove width of the round groove portion 745c.
  • the cross section of the round groove portion 745c is formed in a semicircular arc shape.
  • the upper groove portion 745d of the upper first front protruding piece groove portion 745 is located slightly below the upper end portion of the front protruding piece 742.
  • the lower end portion of the lower groove portion 745e of the lower first front protruding piece groove portion 745 is positioned above the lower end portion of the front protruding piece 742.
  • the lower groove portion 745e of the upper first front protruding piece groove portion 745 and the upper groove portion 745d of the lower first front protruding piece groove portion 745 are separated from each other in the vertical direction.
  • the downward end surface located at the upper end portion of the upper groove portion 745d is defined as the front protruding piece groove portion upper end surface 745a
  • the upward end surface located at the lower end portion of the lower groove portion 745e is defined as the front protruding piece groove portion lower end surface 745b.
  • the front protruding piece 742 is formed with a hole portion 747 penetrating in the second diagonal direction at a position overlapping the first front protruding piece groove portion 745 in the second diagonal direction.
  • the hole portion 747 is formed at a position overlapping the upper side and the lower side of the round groove portions 745c of the two first front side protruding piece groove portions 745 of the front side protruding piece 742, respectively.
  • the second front protruding piece groove portion 746 has a vertical groove portion 746a extending in the vertical direction and a plurality of protruding groove portions 746b protruding inward in the first diagonal direction from the vertical groove portion 746a.
  • the upper and lower groove portions 746a extend in the vertical direction over substantially the entire height of the front protruding piece 742.
  • the upper and lower groove portions 746a have their upper ends located slightly below the upper ends of the front protruding pieces 742, and their lower ends located slightly above the lower ends of the front protruding pieces 742.
  • a plurality of protruding groove portions 746b are formed at equal intervals in the vertical direction.
  • the second front protruding piece groove portion 746 shown in FIG. 15 is provided with eleven protruding groove portions 746b.
  • the plurality of protruding groove portions 746b are continuous with the upper and lower groove portions 746a, respectively, and are formed at substantially the same depth as the upper and lower groove portions 746a
  • a first sliding member 761 is attached to the outer end surface and the rear surface of the front protruding piece 742 in the first diagonal direction.
  • the first sliding member 761 is attached to a position where it does not interfere with the first front protruding piece groove portion 745.
  • the front surface 752a of the rear projecting piece 752 is formed with a first rear projecting piece groove portion 755 extending vertically and a second rear projecting piece groove portion 756 extending vertically.
  • the first rear projecting piece groove portion 755 and the second rear projecting piece groove portion 756 are arranged such that the first rear projecting piece groove portion 755 is spaced apart from the second rear projecting piece groove portion 756 in the first diagonal direction.
  • Each of the first rear protruding piece groove portion 755 and the second rear protruding piece groove portion 756 is open to the front side in the second diagonal direction.
  • the second rear-side protruding piece groove portion 756 is formed at two places with a space in the vertical direction.
  • the two second rear protruding piece groove portions 756 are formed to have substantially the same shape.
  • the second rear projecting piece groove portion 756 includes a round groove portion 755c extending in the up-down direction, an upper groove portion 755d which is provided continuously to the upper end portion of the round groove portion 755c and has a groove width larger than the groove width of the round groove portion 755c, and the round groove portion 755c.
  • a lower groove portion 755e which is continuously provided on the lower end portion of the 755c and has a groove width larger than the groove width of the round groove portion 755c.
  • the cross section of the round groove portion 755c is formed in a semicircular arc shape.
  • the upper groove portion 755d of the upper second rear protruding piece groove portion 756 is located slightly below the upper end portion of the rear protruding piece 752.
  • the lower end portion of the lower groove portion 755e of the second rear protruding piece groove portion 756 on the lower side is located above the lower end portion of the rear protruding piece 752.
  • the lower groove portion 755e of the upper second rear protruding piece groove portion 756 and the upper groove portion 755d of the lower second rear protruding piece groove portion 756 are vertically separated from each other.
  • the downward end surface located at the upper end portion of the upper groove portion 755d is referred to as a rear protruding piece groove portion upper end surface 755a
  • the upward end surface located at the lower end portion of the lower groove portion 755e is referred to as a rear protruding piece groove portion lower end surface 755b.
  • the rear projecting piece 752 has a hole 757 penetrating in the second diagonal direction at a position overlapping the second rear projecting piece groove 756 in the second diagonal direction.
  • the hole portion 757 is formed at a position overlapping the upper side and the lower side of the round groove portion 755c of each of the two second rear side protruding piece groove portions 756 in the rear side protruding piece 752.
  • the second rear protruding piece groove portion 756 has an up-down groove portion 756a extending in the up-down direction and a plurality of protruding groove portions 756b protruding from the up-down groove portion 756a to the outside in the first diagonal direction.
  • the upper and lower groove portions 756a extend in the vertical direction over substantially the entire height of the rear protruding piece 752.
  • the upper and lower groove portions 756a have their upper ends located slightly below the upper ends of the rear protruding pieces 752, and their lower ends located slightly above the lower ends of the rear protruding pieces 752.
  • the plurality of protruding groove portions 756b are formed at equal intervals in the vertical direction.
  • the second rear protruding piece groove portion 756 shown in FIG. 17 is provided with eleven protruding groove portions 756b.
  • the plurality of protruding groove portions 756b are continuous with the upper and lower groove portions 756a, respectively, and are formed at substantially the same depth as the upper and lower groove portions
  • a second sliding member 762 is attached to the outer end surface and the front surface of the rear protruding piece 752 in the first diagonal direction.
  • the second sliding member 762 is attached to a position where it does not interfere with the first rear protruding piece groove portion 755.
  • the armrest main body 71 is provided on the upper side and extends in the front-rear direction, and the armrest main body 71 is provided on the rear side and gradually extends from the rear end portion of the upper rod 711 to the lower side. It has a rear rod 712 extending in an oblique direction and an elbow rest 713 attached to the upper portion of the front portion of the upper rod 711.
  • the armrest main body 71 has an armrest main body cover portion 714 (cover portion) that covers the upper rod 711 and the rear rod 712.
  • the armrest main body 71 is disposed outside the armrest main body supporting portion 72 (see FIG. 13) in the width direction, and the rear rod 712 is attached to the armrest main body supporting portion 72 from the outside in the width direction.
  • the rear rod 712 is formed longer than the armrest main body supporting portion 72 in the up-down direction.
  • the armrest main body cover portion 714 includes a main body portion 781 that covers both sides and a lower side in the width direction of the upper rod 711, an outer side in the width direction of the rear rod 712, a front side, a rear side and a lower side, and an upper rod 711 and a rear rod 712.
  • the main body portion 781 is open upward.
  • the main body portion 781 is formed with an opening portion 781a which is opened inward and upward in the width direction and into which the inner plate portion 782 is fitted from above.
  • the inner plate portion 782 is formed in a flat plate shape, and is fitted into the opening 781a of the main body portion 781 from above with the plate surface facing the width direction.
  • the inner plate portion 782 is divided into upper and lower parts.
  • the lower side of the divided inner plate portions 782 is the lower inner plate portion 784, and the upper side is the upper inner plate portion 785.
  • the lower inner plate portion 784 and the upper inner plate portion 785 are arranged such that, after the lower inner plate portion 784 is fitted into the opening portion 781a of the main body portion 781 from above, the upper inner plate portion 785 is inserted into the opening portion 781a of the main body portion 781. It is fitted from the upper side and is in a state of being arranged vertically.
  • the lower inner plate portion 784 and the upper inner plate portion 785 are placed in contact with each other and arranged in the opening 781a, and the lower end of the lower inner plate 784 abuts the lower end of the opening 781a of the main body 781.
  • the upper end of the lower inner plate portion 784 is arranged at the same height as the upper end of the opening 781a of the main body 781 (the upper end of the main body 781).
  • the lower inner plate portion 784 is formed with two lower groove portions 784a that penetrate in the width direction and extend in the up and down direction and are spaced apart in the front-rear direction.
  • the upper ends of the two lower groove portions 784a reach the upper ends of the lower inner plate portions 784 and are open upward.
  • the lower end of the lower groove portion 784a is arranged above the lower end of the lower plate inner plate portion. Therefore, the lower groove portion 784a does not open downward.
  • a lower cutout portion 784b penetrating in the width direction and opening to the upper side is formed between the two lower groove portions 784a on the upper side of the lower inner plate portion 784.
  • the lower cutout portion 784b communicates with the two lower groove portions 784a.
  • the upper inner plate portion 785 is formed with two upper groove portions 785a that penetrate in the width direction and extend in the up-down direction and are spaced from each other in the front-rear direction.
  • the lower ends of the two upper groove portions 785a reach the upper ends of the upper inner plate portions 785 and are open downward.
  • the upper end of the upper groove 785a is arranged below the upper end of the upper plate inner plate. Therefore, the upper groove portion 785a does not open to the upper side.
  • an upper cutout portion 785b penetrating in the width direction and opening to the lower side is formed.
  • the upper cutout portion 785b communicates with the two upper groove portions 785a.
  • the upper inner plate portion 785 When the upper inner plate portion 785 is arranged on the upper side of the lower inner plate portion 784, the upper groove portion 785a is continuously arranged on the upper side of the lower groove portion 784a, and the upper cutout portion is formed on the upper side of the lower cutout portion 784b.
  • the parts 785b are continuously arranged.
  • two armrest main body cover groove portions 714a and 714b in which the two upper groove portions 785a and the two lower groove portions 784a are continuous are formed in the inner plate portion 782 at intervals in the front-rear direction.
  • the inner plate portion 782 is provided with an armrest main body cover cutout portion 714c in which a lower cutout portion 784b and an upper cutout portion 785b are continuous with each other at an intermediate portion in the vertical direction.
  • the two armrest main body cover groove portions 714a and 714b are configured so that the front side protruding piece 742 and the rear side protruding piece 752 of the armrest main body supporting portion 72 are inserted.
  • the front armrest body cover groove portion is the front armrest body cover groove portion 714a
  • the rear armrest body cover groove portion is the rear armrest body cover groove portion 714b.
  • the front protruding piece 742 of the front member 74 penetrates the front armrest main body cover groove portion 714a
  • the rear protruding piece 752 of the rear member 75 penetrates the rear armrest main body cover groove portion 714b.
  • the front protruding piece 742 that has penetrated the front armrest main body cover groove portion 714 a is arranged inside the rear rod 712.
  • the rear protruding piece 752 penetrating the rear armrest main body cover groove portion 714 b is arranged inside the rear rod 712.
  • the upper plate part 783 is attached to the upper part of the main body part 781 and the inner plate part 782.
  • the upper plate portion 783 is attached to the upper portion of the rear side portion of the upper rod 711, and is located on the rear side of the armrest portion 713.
  • the upper rod 711 has a sheet metal member 716 which is provided inside the armrest main body cover portion 714 and serves as a structural member.
  • the sheet metal member 716 is formed in a shape extending in the front-rear direction.
  • An elbow rest 713 is attached to the upper part of the front member of the sheet metal member 716.
  • the armrest 713 is supported by the sheet metal member 716 so as to be movable in the front-rear direction and the width direction.
  • An upper plate portion 783 is arranged above the rear member of the sheet metal member 716.
  • the rear rod 712 includes a rail member 77 (second engaging portion) that engages with the armrest main body support portion 72 so as to be relatively movable in the vertical direction, and the rail member 77 at a plurality of height positions with respect to the armrest main body support portion 72. And a height position restraining means 79 capable of restraining.
  • the rail member 77 is composed of a long member that extends in the vertical direction.
  • the rail member 77 is formed such that its vertical dimension is slightly smaller than the vertical dimension of the rear rod 712, and is housed inside the armrest main body cover section 714.
  • the vertical dimension of the rail member 77 is set to be longer than the vertical dimension of the armrest main body support portion 72.
  • An upper end portion of the rail member 77 is fixed to a rear end portion of the sheet metal member 716 of the upper rod 711.
  • the rail member 77 is made of metal, and the upper end portion of the second base portion 771 described later is welded to the sheet metal member 716.
  • the rail member 77 includes a rod-shaped second base portion 771 extending in the vertical direction and an upper protruding piece 773 (lower bottom portion) protruding from the upper end portion of the second base portion 771 inward in the first diagonal direction.
  • Side regulating portion a lower protruding piece 774 (upper regulating portion) protruding inward in the first diagonal direction from the lower end portion of the second base portion 771, and an upper protruding piece 773 and a lower protruding portion 774 of the second base portion 771.
  • a ridge portion 772 that protrudes inward in the first diagonal direction from the whole between.
  • the protruding portion 772 is inserted into the elevating groove portion 744 of the armrest main body supporting portion 72.
  • a portion of the outer peripheral surface of the second base portion 771 on the inner side in the width direction (referred to as the inner side surface 771a) is a surface along the second diagonal direction and faces the inner side in the first diagonal direction.
  • the upper projecting piece 773 projects inward in the first diagonal direction from each of the front portion and the rear portion of the inner surface 771a of the second base portion 771 excluding the intermediate portion in the second diagonal direction.
  • a gap 773b is formed between the front side upper protruding piece 773 and the rear side upper protruding piece 773.
  • a second base upper cutout portion 771b continuous to the outer side in the first diagonal direction of the gap 773b between the front side upper protrusion piece 773 and the rear side upper protrusion piece 773 is formed.
  • the lower protruding piece 774 projects inward in the first diagonal direction from the entire inner surface 771a of the second base portion 771 in the second diagonal direction.
  • the upper projecting piece 773 and the lower projecting piece 774 each have a projecting length that gradually increases from the front side to the rear side in the second diagonal direction, and the front end surfaces 773a and 774a are inside in the width direction along the front-rear direction. It is the surface facing.
  • the ridge portion 772 projects inward in the first diagonal direction from an intermediate portion of the inner side surface 771a of the second base portion 771 in the second diagonal direction.
  • the protruding portion 772 has a projecting length that gradually increases from the front side to the rear side in the second diagonal direction, and the front end surface 772e is a surface that faces the inner side in the width direction along the front-rear direction.
  • the front end surface 772e of the protruding portion 772 is flush with the front end surfaces 773a and 774a of the upper projecting piece 773 and the lower projecting piece 774.
  • a front surface (referred to as a front surface 772a) of the outer peripheral surface of the ridge portion 772 is formed on a front surface in the second diagonal direction.
  • a rear-facing surface (referred to as a rear surface 772b) of the outer peripheral surface of the ridge portion 772 is formed as a surface facing the front side in the second diagonal direction.
  • the front surface 772a and the rear surface 772b of the ridge portion 772 are parallel to each other.
  • the front surface 772a of the ridge 772 is formed with a ridge front groove 772c extending over substantially the entire vertical direction.
  • the cross section of the ridge front groove portion 772c is formed in an arc shape.
  • the rear surface 772b of the ridge portion 772 is formed with a ridge portion rear side groove portion 772d extending substantially over the entire vertical direction.
  • the cross section of the convex groove rear side groove portion 772d is formed in an arc shape.
  • the ridge portion 772 is formed with a ridge tip end side groove portion 775 that extends in the up-down direction and opens inward in the first diagonal direction (the side where the ridge portion 772 projects) in the upper portion.
  • the ridge portion front end side groove portion 775 reaches the upper end portion of the ridge portion 772 and is opened upward through a gap 773b between the front side upper protruding piece 773 and the rear side upper protruding piece 773.
  • the ridge portion front end side groove portion 775 is configured such that the height position restraining means 79 (height position fixing portion) is arranged.
  • the portions of the ridge portion 772 on both sides in the second oblique direction of the groove portion 775 on the tip side of the ridge portion are referred to as groove forming pieces 776a and 776b.
  • Each of the two groove forming pieces 776a and 776b has a groove forming piece protruding portion 777 on the lower side that protrudes inward in the first diagonal direction from the upper side.
  • the groove forming piece projecting portion 777 is formed with a groove forming piece cutout portion 777a that is opened inward in the first diagonal direction (the side on which the protruding portion 772 projects).
  • a portion of the groove forming piece 776 above the groove forming piece protruding portion 777 is defined as a groove forming piece upper portion 778.
  • a portion of the ridge portion 772 below the portion in which the ridge portion front end side groove portion 775 is formed is referred to as a ridge portion lower portion 779.
  • the groove forming piece protruding portion 777 protrudes inward in the first oblique direction with respect to the ridge lower portion 779.
  • the lower end of the groove forming piece projecting portion 777 and the upper end of the ridge lower portion 779 are vertically separated from each other.
  • the upper end surface 779a of the lower portion 779 of the protruding portion is formed as a flat surface that faces the direction (vertical direction) in which the groove portion 775 on the leading end side of the protruding portion extends.
  • the height position restraining means 79 is connected to an operating lever 715 (see FIG. 19) provided on the upper rod 711, and the rail member 77 is locked to the armrest main body supporting portion 72 by operating the operating lever 715. , Is configured to switch to the unlocked state.
  • the height position restraining means 79 is connected to the operating lever 715 and moves in the vertical direction by the operation of the operating lever 715, and a state in which the moving position 791 is locked to the armrest main body supporting portion 72 and locked. It has a pin 793 that switches between a released state and a spring 794 that biases the moving portion 791 upward.
  • the moving portion 791 includes a rod-shaped rod-shaped portion 795 that extends in the vertical direction, an operation lever connection portion 796 that is connected to an upper end portion of the rod-shaped portion 795 and projects outward in the first oblique direction from the rod-shaped portion 795, and a rod-shaped portion 795. It has a pin support portion 797 connected to the lower end portion and protruding inward in the first diagonal direction from the rod-shaped portion 795, and a guide piece 798 extending downward from the inside in the first diagonal direction of the pin support portion 797. .
  • a long hole portion 797a that penetrates in the second diagonal direction is formed in the pin support portion 797.
  • the elongated hole portion 797a extends in an oblique direction from the outer side to the inner side in the first oblique direction gradually toward the upper side when viewed from the second oblique direction (direction in which the elongated hole part 797a penetrates).
  • the rod-shaped portion 795 and the pin support portion 797 are arranged in the convex strip front end side groove portion 775 of the rail member 77, and the operation lever connection portion 796 includes the front side upper protruding piece 773 and the rear side upper protruding piece 773. And the second base upper cutout portion 771b, and the guide piece 798 is installed inside the convex lower portion 779 in the first diagonal direction.
  • the pin support portion 797 is arranged above the ridge lower portion 779.
  • a spring 794 is provided between the pin support portion 797 and the ridge lower portion 779. The spring 794 is configured to bias the pin support portion 797 upward so that the moving portion 791 is biased upward.
  • the long hole portion 797a of the pin support portion 797 overlaps the groove forming piece cutout portion 777a of the two groove forming piece projecting portions 777 in the second diagonal direction. It is located in a position.
  • the vertical dimension of the long hole portion 797a is set to be larger than the vertical dimension of the groove forming piece cutout portion 777a.
  • the dimension of the long hole portion 797a in the first diagonal direction is set to be substantially the same as the dimension of the groove forming piece cutout portion 777a in the first diagonal direction.
  • the pin 793 is inserted into the long hole portion 797a of the pin support portion 797 and the groove forming piece cutout portion 777a of the two groove forming piece protruding portions 777.
  • the pin 793 is formed in a cylindrical shape and is inserted into the long hole portion 797a in a direction extending in the second diagonal direction.
  • the guide piece 798 is in contact with the inner surface of the lower portion 779 of the ridge portion in the first diagonal direction (the tip surface 772e of the ridge portion 772).
  • the operation lever 715 is provided so as to penetrate the armrest main body cover portion 714 in the front-rear direction.
  • the operating lever 715 is disposed inside the armrest main body cover portion 714 (see FIG. 18) and is located above the operating lever connecting portion 796 of the moving portion 791, and the armrest main body cover portion. 714, which is disposed outside the 714 and is operable by a seated person.
  • the operation lever 715 has a pressing portion 715b provided on the rear side of the operation portion 715a, and is configured to be rotatable around the axis of a rotation shaft portion 715c extending in the width direction.
  • the rotating shaft portion 715c is arranged on the sheet metal member 716 of the upper rod 711.
  • the operation lever 715 is configured to be rotatable with respect to the sheet metal member 716.
  • the operation portion 715a is located below the armrest main body cover portion 714, and is configured to be operated by a seated person by pushing it from the lower side to the upper side.
  • the operating portion 715a When the operating portion 715a is pushed from below, the operating lever 715 rotates around the axis of the rotating shaft portion 715c, the pressing portion 715b moves downward, and pushes the moving portion 791 downward.
  • the moving portion 791 compresses the spring 794 and moves downward when pressed downward by the operation of the operation lever 715, and restores the restoring force of the spring 794 when the downward pressing is released by operation of the operation lever. Is configured to return to the upper side.
  • a state in which a downward load is applied to the moving portion 791 is an operating state, and a state in which a downward load is not applied is a normal state.
  • the lower end portion 797b of the long hole portion 797a overlaps the groove forming piece cutout portion 777a in the second diagonal direction.
  • the upper end portion 797c of the long hole portion 797a overlaps the groove forming piece cutout portion 777a in the second diagonal direction in the operating state.
  • the pin 793 penetrates the groove forming piece cutout portion 777a and the lower end portion 797b of the elongated hole portion 797a in the normal state, and in the operating state, the groove forming piece cutout portion 777a and the upper end portion 797c of the elongated hole portion 797a. Penetrates.
  • the groove forming piece cutout portion 777a extends in the first diagonal direction and has a vertical dimension set to be substantially the same as the outer shape of the pin 793.
  • the pin 793 penetrating the groove forming piece cutout portion 777a cannot move in the vertical direction relative to the rail member 77 in which the groove forming piece cutout portion 777a is formed, and thus the pin 793 does not move to the groove portion forming cutout portion 777a. It is configured to relatively move only along the first diagonal direction.
  • the upper end portion 797c of the long hole portion 797a is arranged inside the lower end portion 797b in the first diagonal direction. Therefore, when the pin 793 is in the operated state and penetrates the upper end portion 797c, the pin 793 is arranged on the inner side in the first diagonal direction from the normal state.
  • the guide piece 798 is in contact with the inner surface (the front end surface 772e of the ridge 772e) of the ridge lower part 779 in the first oblique direction in either of the normal state and the operating state, or makes a slight gap. Are facing each other.
  • the moving portion 791 that is displaced from the normal state to the operating state and from the operating state to the normal state is always displaced vertically along the ridge lower side portion 779 of the ridge 772, such as in the first diagonal direction. It is prevented from being displaced or rotated in the horizontal direction.
  • the rail member 77 and the height position restraint means 79 are arranged inside the armrest main body cover portion 714 and outside the inner plate portion 782 of the armrest main body cover portion 714 in the first oblique direction. It is installed in.
  • the ridge portion 772 of the rail member 77 is arranged at a position that overlaps between the front armrest main body cover groove portion 714a and the rear armrest main body cover groove portion 714b of the inner plate portion 782 in the first diagonal direction, and the tip of the ridge portion 772.
  • the surface 772e is in contact with the inner plate portion 782.
  • the lower inner plate portion 784 of the inner plate portion 782 is fixed to the ridge portion 772 by a fixture such as a screw.
  • the lower surface of the upper protruding piece 773 of the rail member 77 is arranged at the same height as the upper ends of the two upper groove portions 785a of the upper inner plate portion 785, and the upper surface of the lower protruding piece 774 of the rail member 77 is the lower side. It is arranged at the same height as the lower end portions of the two lower groove portions 784a of the inner plate portion 784.
  • the groove forming piece projecting portion 777 of the ridge portion 772, the pin supporting portion 797 of the moving portion 791 of the height position restraining means 79, the guide piece 798, and the pin 793 are provided in the armrest main body cover cutout portion 714c of the inner plate portion 782. It is arranged.
  • the groove forming piece projecting portion 777 of the ridge portion 772, the moving portion 791 pin supporting portion 797 and the guide piece 798 of the height position restraining means 79 project further inward in the first diagonal direction than the inner plate portion 782.
  • the pin 793 moves inward in the first diagonal direction
  • the pin 793 is arranged inward of the inner plate portion 782 in the first diagonal direction.
  • the ridge portion 772 penetrates through the front armrest main body cover groove portion 714a and the rear armrest main body cover groove portion 714b and protrudes from the front side of the armrest main body support portion 72 disposed inside the armrest main body cover portion 714. It is inserted in the elevating groove portion 744 between the piece 742 and the rear protruding piece 752.
  • the inner side surface 771a of the second base portion 771 is in contact with the front end surfaces of the front side protruding piece 742 and the rear side protruding piece 752 via the sliding members 761 and 762.
  • the front surface 772a of the protruding portion 772 faces the rear surface 742b of the front protruding piece 742 with a space therebetween.
  • the ridge front groove portion 772c of the front surface 772a of the ridge portion 772 faces each of the two first front protruding piece groove portions 745 of the rear surface 742b of the front protruding piece 742.
  • a columnar first retaining member 763 extending in the up-down direction is provided between the ridge front groove portion 772c and each of the two first front protruding piece groove portions 745.
  • the surface of the first retaining member 763 is a sliding surface.
  • the two first retaining members 763 are formed to have a length dimension slightly shorter than the lengthwise dimension of the first front protruding piece groove portion 745, and the front portion is inserted into each of the two first front protruding piece groove portions 745. Has been done.
  • the first retaining member 763 inserted into the first front protruding piece groove portion 745 is brought into contact with the front protruding piece groove upper end surface 745a and the front protruding piece groove lower end surface 745b of the first front protruding piece groove portion 745. Vertical displacement with respect to the protruding piece 742 is restricted.
  • the rear side portion of the first retaining member 763 is inserted into the ridge front groove portion 772c of the ridge portion 772.
  • the first retaining prevention member 763 inserted in the ridge front groove 772c is configured to be vertically displaceable relative to the ridge 772 along the ridge front groove 772c.
  • the rear surface 772b of the ridge 772 faces the front surface 752a of the rear protruding piece 752 with a space.
  • the ridge portion rear side groove portion 772d of the rear surface 772b of the ridge portion 772 faces each of the two first rear side protruding piece groove portions 755 of the front surface 752a of the rear side protruding piece 752.
  • a columnar second retaining member 764 extending in the up-down direction is provided between the ridge rear groove portion 772d and each of the two first rear protruding piece groove portions 755.
  • the surface of the second retaining member 764 is formed as a sliding surface.
  • a columnar second retaining member 764 extending in the up-down direction is provided between the ridge front groove portion 772c and each of the two first rear protruding piece groove portions 755.
  • the surface of the second retaining member 764 is formed as a sliding surface.
  • the second retaining member 764 is formed to have a length dimension slightly shorter than the dimension of the first rear side protruding piece groove portion 755 in the length direction, and the front portion is inserted into each of the two first rear side protruding piece groove portions 755. Has been done.
  • the second retaining member 764 inserted into the first rear projecting piece groove portion 755 is in contact with the rear projecting piece groove portion upper end surface 755a of the first rear projecting piece groove portion 755 and the rear projecting piece groove portion lower end surface 755b. By making contact with each other, displacement in the vertical direction with respect to the rear protruding piece 752 is restricted.
  • the rear side portions of the two second retaining prevention members 764 are inserted into the rear projection groove portions 772d of the projection portion 772.
  • the second retaining member 764 inserted in the rear projection groove portion 772d is configured to be vertically displaceable along the projection portion 772 and the rear projection groove portion 772d.
  • Such an armrest main body 71 is configured to be able to move up and down with respect to the armrest main body support portion 72 in a state where the ridge portion 772 of the rail member 77 is inserted into the elevating groove portion 744 of the armrest main body support portion 72. ing. Then, as described above, the ridge portion front side groove portion 772c and the first front side protruding piece groove portion 745 are integrally inserted between the ridge portion 772 of the rail member 77 and the front side protruding piece 742 of the armrest main body support portion 72.
  • the first retaining prevention member 763 is provided, and the ridge rear groove portion 772d and the first rear protruding piece groove portion are provided between the ridge portion 772 of the rail member 77 and the rear protruding piece 752 of the armrest main body supporting portion 72.
  • a second retaining member 764 that is integrally inserted in 755 is provided.
  • the ridge front groove 772c formed on the front protruding piece 742 of the armrest main body support 72, the ridge rear groove 772d formed on the rear protruding piece 752, and the ridge 772 of the rail member 77 are formed.
  • the protruding ridge front side groove 772c, the protruding ridge rear side groove 772d, the first retaining prevention member 763 and the second retaining prevention member 764 are the armrest main body 71 in which the protruding ridge 772 is inserted into the elevating groove 744.
  • the armrest main body supporting portion 72 constitutes a movement restricting portion that restricts movement of the armrest main body supporting portion 72 in the first diagonal direction away from each other.
  • the pin 793 of the height position restraining means 79 has one end (the end on the front side in the second diagonal direction) in the second front protruding piece groove portion 746 of the front protruding piece 742. The other end (the end on the rear side in the second diagonal direction) is inserted into the second rear protruding piece groove portion 756 of the rear protruding piece 752.
  • the pin 793 is provided in any one of the plurality of protruding groove portions 746b of the second front protruding piece groove portion 746 and in any one of the plurality of protruding groove portions 756b of the second rear protruding piece groove portion 756. Has been inserted.
  • the protruding groove portion 746b of the second front protruding piece groove portion 746 into which the pin 793 is inserted in the normal state and the protruding groove portion 756b of the second rear protruding piece groove portion 756 are located at the same height.
  • the pin 793 is inserted into the projecting groove portion 746b of the second front projecting piece groove portion 746 and the projecting groove portion 756b of the second rear projecting piece groove portion 756, the vertical movement is restricted.
  • the pin 793 When the moving portion 791 is pushed downward by the operation of the operation lever 715 to change from the normal state to the operation state, the pin 793 is arranged inside the position in the normal state in the first diagonal direction. Therefore, the pin 793 is inserted into the vertical groove portion 746a of the second front protruding piece groove portion 746 of the front protruding piece 742 and the vertical groove portion 756a of the second rear protruding piece groove portion 756 of the rear protruding piece 752. When the pin 793 is inserted into the vertical groove portions 746a and 756a, it can move in the vertical direction. In this state, when the seated person pulls up or pushes down the armrest main body 71, the armrest main body 71 moves up and down.
  • the moving portion 791 moves upward, and the pin 793 is arranged outside the position in the operating state in the first diagonal direction. Accordingly, when the pin 793 is inserted into the projecting groove portion 746b of the second front projecting piece groove portion 746 and the projecting groove portion 756b of the second rear projecting piece groove portion 756, the movement in the vertical direction is restrained.
  • the cover member 73 covers the first base portion 721 of the armrest main body support portion 72.
  • the cover member 73 is formed in a tubular shape, and is arranged so as to open in the first diagonal direction.
  • the cover member 73 includes a front plate portion 731 that covers the front surface 721a of the first base portion 721, a rear plate portion 732 that covers the rear surface 721b of the first base portion 721, an upper plate portion 733 that covers the upper surface 721c of the first base portion 721, and And a lower plate portion 734 that covers the lower surface 721d of the first base portion 721.
  • the front plate portion 731 has an upper end portion located above the upper surface 721c of the first base portion 721 and a lower end portion located below the lower surface 721d of the first base portion 721.
  • the inner end portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the first side surface 721e of the first base portion 721.
  • the outer edge portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the outer edge portion of the first base portion 721 in the first diagonal direction.
  • a front plate step portion 731b extending vertically is formed at an intermediate portion in the first diagonal direction.
  • an outer portion 731c on the outer side of the front plate step portion 731b in the first diagonal direction is located on the front side of an inner portion 731d on the inner side of the front plate step portion 731b in the first diagonal direction.
  • the rear plate 732 has an upper end located above the upper surface 721c of the first base 721 and a lower end located below the lower surface 721d of the first base 721.
  • the inner end portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the first side surface 721e of the first base portion 721.
  • the outer edge portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the outer edge portion of the first base portion 721 in the first diagonal direction.
  • a front edge portion of the upper plate portion 733 is connected to an upper edge portion of the front plate portion 731, and a rear edge portion thereof is connected to an upper edge portion of the rear plate portion 732.
  • the outer edge of the upper plate portion 733 in the first diagonal direction is arranged at a position overlapping the vicinity of the outer edge of the first base portion 721 in the first diagonal direction.
  • the upper plate portion 733 projects more inward in the width direction than the front plate portion 731 and the rear plate portion 732.
  • a portion of the upper plate portion 733 that projects inward in the width direction with respect to the front plate portion 731 and the rear plate portion 732 is referred to as a protruding plate portion 733b.
  • the projecting plate portion 733b projects further inward in the width direction than the first base portion 721.
  • a plurality of upper ribs 735 projecting downward from the lower surface of the upper plate portion 733 are formed below the upper plate portion 733.
  • the upper rib 735 is configured such that the lower end portion thereof contacts the upper surface 721c of the first base portion 721.
  • the lower plate portion 734 has a front edge portion connected to the lower edge portion of the front plate portion 731 and a rear edge portion connected to the lower edge portion of the rear plate portion 732.
  • the outer edge in the width direction of the lower plate portion 734 is arranged at a position overlapping the vicinity of the outer edge in the width direction of the first base portion 721.
  • the inner edge in the width direction of the lower plate portion 734 is arranged at a position overlapping the lower side of the first side surface 721e of the first base portion 721.
  • a plurality of lower ribs 736 protruding upward from the upper surface of the lower plate portion 734 and an inner plate portion 737 provided on the upper side of the lower rib 736 are provided on the upper side of the lower plate portion 734.
  • the plate surface of the inner plate portion 737 is oriented substantially vertically, the front edge portion is connected to the front plate portion 731, and the rear edge portion is connected to the rear plate portion 732.
  • the upper surface of the inner plate portion 737 is configured to contact the lower surface 721d of the first base portion 721.
  • the armrest main body 7 is connected to the armrest main body 71 and the armrest main body support portion 72, and the cover member 73 is attached to the first base 721 of the armrest main body support portion 72 connected to the armrest main body 71. 72 is fixed to the backrest support portion 24.
  • the sheet metal member 716 of the upper rod 711 and the rail member 77 are welded. Note that, in FIG. 19, the elbow rest 13 and the upper plate 783 are attached, but in the present embodiment, the elbow rest 13 and the upper plate 783 are attached in a later step.
  • the height position restraint means 79 is attached to the rail member 77, and the operation lever 715 is attached to the sheet metal member 716 so as to be rotatable.
  • the spring 794 of the height position restraining means 79 is installed on the upper portion of the lower ridge portion 779 of the rail member 77, and the moving portion 791 of the height position restraining means 79 is arranged in the groove portion 775 of the ridge portion of the rail member 77. To do.
  • the spring 794 is in a state of being sandwiched between the pin support portion 797 of the moving portion 791 and the ridge lower portion 779.
  • the pin 793 is inserted from the second diagonal direction into the long hole portion 797a of the pin support portion 797 of the moving portion 791 and the groove portion formation piece cutout portion 777a of the two groove portion formation piece protrusion portions 777 of the rail member 77.
  • the pressing portion 715b of the operation lever 715 is arranged above the operation lever connecting portion 796 of the moving portion 791.
  • the rail member 77 and the front side member 74 and the rear side member 75 of the armrest main body support portion 72 are connected.
  • the first retaining member 763 is installed in the first front protruding piece groove portion 745 of the front member 74 shown in FIG. 25, and the second retaining member 764 is installed in the first rear protruding piece groove portion 755 of the rear member 75.
  • the first sliding member 761 is attached to the outer end surface and the rear surface of the front projecting piece 742 of the front member 74 in the first diagonal direction, and the first slanting outer end surface of the rear projecting piece 752 of the rear member 75.
  • the second sliding member 762 is attached to the front surface.
  • the front protruding piece 742 of the front member 74 and the rear protruding piece 752 of the rear member sandwich the ridge portion 772 of the rail member 77 from the front-rear direction, so that the first retaining member 763 protrudes from the rail member 77.
  • the second retaining member 764 is disposed in the front groove portion 772c of the ridge portion, and the second retaining member 764 is disposed in the rear groove portion 772d of the ridge portion. Then, the front connecting portion 741 of the front member 74 and the rear connecting portion 751 of the rear member 75 are connected by a connecting tool such as a bolt.
  • the first sliding member 761 attached to the front protruding piece 742 is in contact with the inner side surface 771a of the second base portion 771 of the rail member 77 and the front surface 772a of the ridge portion 772.
  • the second sliding member 762 attached to the rear protruding piece 752 is in contact with the inner surface 771a of the second base portion 771 of the rail member 77 and the rear surface 772b of the ridge portion 772.
  • a sliding member may be attached to the rail member 77, and the front protruding piece 742 and the rear protruding piece 752 may slidably contact the sliding member.
  • the sheet metal member 716, the rail member 77, the height position restraining means 79, and the operation lever 715 installed as described above are referred to as an armrest inner member 717.
  • the members other than the upper plate portion 783 of the armrest main body cover portion 714 are attached to the armrest inner member 717.
  • the front member 74 and the rear member 75 of the armrest main body support portion 72 are moved to the upper side of the rail member 77, and the lower inner plate portion 784 of the armrest main body cover portion 714 is moved to the rail member 77.
  • the body part 781 of the armrest body cover part 714 is attached to the armrest inner member 717 from the lower side.
  • the lower inner plate portion 784 is fitted into the lower portion of the opening portion 781a of the main body portion 781.
  • the upper inner plate portion 785 of the armrest main body cover portion 714 shown in FIG. 18 is inserted into the opening portion 781a of the main body portion 781 from above and fitted. As a result, parts other than the armrest main body cover portion 714 upper plate portion 783 are attached to the armrest inner member 717.
  • the cover member 73 is attached to the first base portion 721 of the armrest main body support portion 72 connected to the armrest main body 71.
  • the cover member 73 is attached to the armrest main body support portion 72 from the inside in the first diagonal direction.
  • the elbow rest 713 is fixed to the sheet metal member 716.
  • the upper plate portion 783 of the armrest body cover portion 714 is attached to the upper portion of the body portion 781 of the armrest body cover portion 714 and the upper inner plate portion 785.
  • the armrest portion 713 may be fixed to the metal plate member 716 and the upper plate portion 783 of the armrest main body cover portion 714 may be fixed after the armrest 7 is fixed to the backrest support portion 24.
  • the lower protruding piece 774 and the upper protruding piece 773 of the rail member 77 engage with the armrest main body cover portion 714.
  • the armrest main body cover portion 714 are configured to be connected. This prevents the rail member 77 and the armrest body cover portion 714 from being displaced.
  • the rail member 77 of the armrest main body 71 and the front protruding piece 742 and the rear protruding piece 752 of the armrest main body supporting portion 72 slide with respect to each other in the vertical direction.
  • the relative displacement allows the armrest main body 71 to change its height with respect to the armrest main body support portion 72.
  • the armrest main body support portion 72 is located on the upper side of the rail member 77. As shown in FIG.
  • the armrest main body support portion 72 when the armrest main body 71 is at the uppermost position with respect to the armrest main body support portion 72, the armrest main body support portion 72 is located on the lower side of the rail member 77. Regardless of the position of the armrest main body 71, the armrest main body support portion 72 supports the armrest main body 71 in a state in which the rail member 77 is entirely locked in the height direction. As shown in FIG. 29, when the lower projecting piece 774 comes into contact with the lower end portions of the front projecting piece 742 and the rear projecting piece 752 of the armrest main body supporting portion 72, the rail member 77 is further armrest main body supporting portion 72. The upward movement with respect to is restricted.
  • the armrest 7 is in a state in which the armrest main body support portion 72 and the armrest main body 71 are connected as described above, and the cover member 73 is attached to the first base portion 721 of the armrest main body support portion 72.
  • the armrest 7 has an armrest body support portion 72 and a cover in a recess 27 between the backrest support portion 24 and the backrest body 41, which are connected to each other after the backrest body 41 is fixed to the backrest support portion 24.
  • the member 73 is inserted and fixed to the backrest support portion 24.
  • the recess 27 is surrounded by the protruding plate portion 26 of the backrest support portion 24, the connecting portion outer surface 54 of the connecting portion 5, and the face material locking portion 463 of the vertical frame portion 46 of the backrest body 41. Open in the first diagonal direction.
  • the inner portion of the armrest body support portion 72 in the first diagonal direction is inserted into the recess 27.
  • the armrest 7 is placed in the recess 27 so that the upper and lower second fourth hole portions 743 of the front member 74 of the armrest main body supporting portion 72 respectively overlap the upper and lower second hole portions 56 of the connecting portion 5 in the first diagonal direction. insert.
  • the first side surface 721e of the first base portion 721 is brought into contact with the connecting portion outer surface 54 of the connecting portion 5 of the backrest support portion 24, and the front plate portion 731, the rear plate portion 732, and the lower plate portion of the cover member 73 are formed.
  • Each of the edges 734 (see FIG. 13) on the inner side in the first diagonal direction is brought into contact with the outer surface 54 of the connecting portion.
  • the protruding plate portion 733b of the upper plate portion 733 of the cover member 73 is arranged above the connecting portion 5, and the lower surface of the protruding plate portion 733b and the upper surface of the connecting portion 5 are brought into contact with each other.
  • the inner portion 731d of the front surface 731a of the front plate portion 731 of the cover member 73 is brought into contact with the rear surface of the face material locking portion 463 of the vertical frame portion 46 of the backrest main body 41.
  • the connecting portion 5 and the armrest main body supporting portion 72 are located on the rear side of the face member 43, and the second hole portion 56 of the connecting portion 5 and the fourth hole portion 743 of the armrest main body supporting portion 72 are arranged from the outer side in the width direction. Also opens diagonally toward the front.
  • the opening direction of the second hole portion 56 and the fourth hole portion 743 is along the backrest body 41.
  • the opening direction of the second hole portion 56 and the fourth hole portion 743 is a direction that approaches the backrest surface 431 from the inner side to the outer side in the width direction.
  • the second bolt 62 is inserted into the second hole portion 56 and the fourth hole portion 743 from the inner side to the outer side in the width direction.
  • the second bolt 62 is inserted into the second hole portion 56 and the fourth hole portion 743 from the side separated from the backrest surface 431 toward the side close to the backrest surface 431. It is configured.
  • the front member 74 of the armrest main body supporting portion 72 is connected to the connecting portion 5, and the armrest. 7 is fixed to the backrest support portion 24.
  • the front surface 51 of the connecting portion and the inner portion 731d of the front surface 731a of the front plate portion 731 of the cover member 73 are arranged substantially flush with each other.
  • the armrest main body support portion 72 and the cover member 73 are sandwiched between the protruding plate portion 26 of the backrest support portion 24 and the face material locking portion 463 of the vertical frame portion 46 from the front and back, and the armrest main body support portion 72. Also, the connecting portion between the cover member 73 and the connecting portion 5 is covered.
  • the widthwise outer end of the face material locking portion 463 of the vertical frame portion 46 is arranged along the front plate step portion 731b of the front plate portion 731 of the cover member 73, and is arranged in the width direction of the front plate step portion 731b. It is in contact with the inside. Therefore, the cover member 73 and the vertical frame portion 46 are prevented from shifting in the width direction.
  • the armrest main body supporting portion 72 and the cover member 73 project outward in the width direction from the backrest main body 41, and the armrest main body 71 supported by the armrest main body supporting portion 72 corresponds to the backrest main body 41. They are separated from each other and are located outside the outer peripheral frame portion 42 in the width direction.
  • the upper rod 711 of the armrest main body 71 extends in the front-rear direction. Since the armrest portion 713 of the upper rod 711 of the armrest main body 71 is arranged on the front side of the backrest body 41, it is separated from the backrest body 41.
  • the armrest 7 may be fixed to the backrest support portion 24 and then the backrest body 41 may be fixed to the backrest support portion 24.
  • the armrest main body 71 moves up and down with respect to the armrest main body support portion 72, the armrest main body 71 is only on the upper side of the armrest main body support portion 72. Not only on the lower side, but also on the entire armrest main body supporting portion 72 in the height direction. As a result, the armrest main body 71 can be installed in a stable state at any height with respect to the armrest main body support portion 72.
  • the engaging portions (the ridges 772, the front protruding pieces 742, and the rear protruding pieces 752) between the armrest main body 71 and the armrest main body support portion 72 are arranged inside the armrest main body cover portion 714, It is possible to prevent the engaging portion between the armrest main body 71 and the armrest main body supporting portion 72 from being exposed, and there is no risk that a person or an object will come into contact with the engaging portion between the armrest main body 71 and the armrest main body supporting portion 72, which is safe. It is possible to improve not only the design but also the design.
  • the height position restraining means 79 capable of fixing the height position of the armrest main body 71 to the armrest main body supporting portion 72 in the vertical direction at a plurality of different vertical positions is provided.
  • Means 79 are located inside the armrest body cover 714.
  • a lower protruding piece 774 that restricts the movement of the armrest main body 71 above the slidable range and an upper protruding piece 773 that restricts the movement below the slidable range are provided.
  • the lower protruding piece 774 and the upper protruding piece 773 are connected to the armrest main body cover portion 714.
  • the lower protruding piece 774 and the upper protruding piece 773 are connected to the armrest main body cover portion 714, so that the vertical movement of the armrest main body 71 is restricted, so that the lower protruding piece 774 and the upper protruding piece 773 are attached.
  • the impact can also be borne by the armrest main body cover portion 714, and the armrest main body 71 can have a strong structure.
  • the armrest 7 has an armrest main body 71 on which a seated person rests his / her arm, and an armrest main body support part 72 supported by the support structure 2 of the chair 1 and attached to the armrest main body 71 so as to be vertically movable.
  • the support portion 72 has a lift groove forming portion 723 (first engaging portion), and the armrest main body 71 extends in the vertical direction and the lift groove forming portion 723 is arranged between the upper end portion and the lower end portion.
  • An armrest main body that covers the rail member 77 (second engaging portion) that is slidably locked in the up-and-down groove forming portion 723, the rail member 77, and the up-and-down groove forming portion 723 that locks the rail member 77.
  • the armrest 7 has height position restraining means 79 (height position fixing portion) capable of fixing the rail member 77 to a plurality of vertical positions with respect to the elevating groove forming portion 723, and the height position restraining means 79. Is arranged inside the armrest main body cover portion 714.
  • the armrest 7 has a lower protruding piece that restricts the lifting groove forming portion 723 from moving upward beyond the slidable range of the rail member 77 disposed between the upper end portion and the lower end portion of the rail member 77. 774 (upper side restricting portion) and an upper protruding piece 773 (lower side restricting portion) that restricts the movement of the rail member 77 below the slidable range.
  • the lower protruding piece 774 and the upper protruding portion are provided.
  • the piece 773 is connected to the armrest body cover portion 714.
  • the armrest 7 is slidable with the lower projecting piece 774 (upper side regulating portion) that regulates the movement of the rail member 77 to the upper side than the slidable range of the rail member 77 with respect to the elevating groove forming portion 723.
  • An upper projecting piece 773 (lower restricting portion) that restricts the movement of the rail member 77 below the range.
  • the backrest 4 has a backrest main body 41 on which a seated person leans his / her back, and an armrest 7, and an armrest main body 71 is arranged outside the backrest main body 41 in the width direction.
  • the chair 1 has an armrest 7.
  • the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit thereof.
  • the armrest 7 is arranged outside the backrest main body 41 in the width direction, but it is provided outside the widthwise outside of the backrest main body 41, such as the front side of the backrest main body 41.
  • the height position restraining means 79 capable of fixing the height position of the armrest main body 71 to the armrest main body supporting portion 72 in the vertical direction at a plurality of different vertical positions is provided.
  • the mechanism for adjusting the vertical position of the armrest body 71 relative to the armrest body support portion 72 may be other than the above, and the armrest body cover portion 714. Does not have to be placed inside.
  • the mechanism for restricting the movement of the armrest main body 71 above and below the slidable range is other than the above. Or may not be connected to the armrest main body cover portion 714.
  • the armrest main body support portion 72 is fixed to the backrest support portion 24, but it may be fixed to a part other than the backrest support portion 24, for example, the backrest body 41.
  • the armrest 7 is fixed to the backrest support 24 by connecting the front member 74 of the armrest main body support 72 to the connecting portion 5.
  • the rear member 75 of the armrest main body support portion 72 is configured to be connectable to the connecting portion 5, and the rear member 75 is connected to the connecting portion 5, so that the armrest 7 supports the backrest supporting portion 24. It may be fixed to.
  • one of the front side member 74 and the rear side member 75 of the armrest main body support portion 72 may be integrally provided on the backrest support portion 24. Further, one of the front side member 74 and the rear side member 75 of the armrest main body supporting portion 72 may be integrally provided on the backrest main body 41. For example, either the front side member 74 or the rear side member 75 of the armrest main body support portion 72 may be integrally provided on the outer peripheral frame portion 42 of the backrest main body 41.
  • the present invention can be applied to an armrest on which a seated person rests his / her arm, and a backrest and a chair having such an armrest. It can be installed in a stable state even in height, and the design of the armrest can be improved.

Landscapes

  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

An armrest (7) according to the present invention comprises an armrest body (71) on which a seated person rests his/her elbow, and an armrest body support portion (72) that is supported by a support structure of a chair and to which the armrest body is attached in a vertically movable manner, wherein the armrest body support portion includes a first engagement portion (723), and the armrest body extends vertically such that the first engagement portion is disposed between the upper end portion and the lower end portion of the armrest body, and includes a second engagement portion (77) that is locked to the first engagement portion in a vertically slidable manner, and a cover portion (714) that covers the second engagement portion and the first engagement portion to which the second engagement portion is locked.

Description

肘掛け、背凭れおよび椅子Armrests, backrests and chairs
　本発明は、肘掛け、背凭れおよび椅子に関する。
　本願は、２０１８年１０月１９日に日本に出願された特願２０１８－１９７７５７号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to armrests, backrests and chairs.
The present application claims priority based on Japanese Patent Application No. 2018-197757 filed on October 19, 2018 in Japan, and the content thereof is incorporated herein.
　椅子の肘掛けとして、着座者が肘を掛ける肘掛け本体と、椅子の支持構造体に支持されて肘掛け本体が昇降可能に取り付けられた肘掛け本体支持部と、を有する肘掛けが知られている（例えば、特許文献１および２参照）。 As an armrest of a chair, an armrest having an armrest main body on which a seated person rests his / her arm, and an armrest main body support portion supported by a support structure of the chair and attached to the armrest main body so as to be able to move up and down is known (for example, See Patent Documents 1 and 2.
　特許文献１に開示された肘掛けでは、肘掛け本体は、着座者が肘を置く肘置き部と、肘置き部の下側に連結された上下方向に延びる棒状の摺動部材と、肘置き部および摺動部材と連結され摺動部材の周囲を覆う上下方向に延びる筒状のカバー部と、を有している。
　肘掛け本体支持部は、カバー部の外側に設けられ、椅子の支持構造体や背凭れなどに取り付けられる取付部材と、カバー部の内側に設けられカバー部材に形成された溝部を介して取付部材と連結されるガイド部材と、を有している。ガイド部材には、上側に開口し上下方向に延びて、摺動部材が昇降可能に挿入される孔部が形成されている。ガイド部材は、上下方向の複数の箇所において摺動部材を係止できるように構成されている。 In the armrest disclosed in Patent Document 1, the armrest main body includes an elbow rest on which a seated person places an elbow, a vertically extending rod-shaped sliding member connected to a lower side of the elbow rest, and an armrest. And a tubular cover portion that is connected to the sliding member and that extends in the up-down direction and that covers the periphery of the sliding member.
The armrest main body support portion is provided on the outside of the cover portion and is attached to a support structure of a chair or a backrest, and the attachment member is provided inside the cover portion via a groove portion formed in the cover member. And a guide member to be connected. The guide member is formed with a hole opening upward and extending in the vertical direction, into which the sliding member is vertically movable. The guide member is configured to be able to lock the sliding member at a plurality of locations in the vertical direction.
　特許文献２に開示された肘掛けでは、肘掛け本体は、着座者が肘を置く肘置き部と、肘置き部の後側に連結された摺動部材と、を有している。
　肘掛け本体支持部は、椅子の背凭れに取り付けられたガイド部材を有している。ガイド部材には、側方に開口し上下方向に延びて、摺動部材が昇降可能に挿入される溝部が形成されている。ガイド部材は、上下方向の複数の箇所において摺動部材を係止できるように構成されている。 In the armrest disclosed in Patent Document 2, the armrest main body has an elbow rest on which a seated person rests his elbow, and a sliding member connected to the rear side of the elbow rest.
The armrest body support part has a guide member attached to the backrest of the chair. The guide member is formed with a groove portion which is opened laterally and extends in the vertical direction and into which the sliding member is vertically movable. The guide member is configured to be able to lock the sliding member at a plurality of locations in the vertical direction.
日本国特表２０１０－５０５５０７号公報Japanese special table 2010-505507 独国特許出願公開第１０２０１５２１９５４６号明細書German Patent Application Publication No. 102015219546
　特許文献１に開示された肘掛けでは、肘置き部を下位置に設置するために摺動部材を下降させると、摺動部材の下端部がガイド部材の下部側に位置し、摺動部材の上下方向の略全体がガイド部材の上下方向の略全体に係止された状態となる。
　これに対し、肘置き部を上位置に設置するために摺動部材を上昇させると、摺動部材の下端部がガイド部材の上部側に位置し、摺動部材の下部側がガイド部材の上部側のみに係止された状態となる。このため、肘置き部を上位置に設置する場合の方が、肘置き部を下位置に設置する場合と比べて安定性が低くなる虞がある。 In the armrest disclosed in Patent Document 1, when the sliding member is lowered to set the elbow rest at the lower position, the lower end of the sliding member is located on the lower side of the guide member, and The substantially entire direction is in a state of being locked to substantially the entire vertical direction of the guide member.
On the other hand, when the sliding member is raised to install the elbow rest on the upper position, the lower end of the sliding member is located on the upper side of the guide member and the lower side of the sliding member is on the upper side of the guide member. It will be locked only on. Therefore, when the elbow rest is installed in the upper position, the stability may be lower than when the elbow rest is installed in the lower position.
　特許文献２に開示された肘掛けでは、肘置き部が上位置に設置された場合も、下位置に設置された場合も摺動部材はガイド部材に同様に係止されている。しかしながら、ガイド部材の上下方向の寸法が摺動部材の上下方向の寸法よりも大きく設定されているため、肘置き部が上位置に設置されるとガイド部材の下部側が露出し、肘置き部が下位置に設置されるとガイド部材の上部側が露出してしまい意匠性が低下する虞がある。 In the armrest disclosed in Patent Document 2, the sliding member is similarly locked to the guide member regardless of whether the elbow rest is installed in the upper position or in the lower position. However, since the vertical dimension of the guide member is set larger than the vertical dimension of the sliding member, when the elbow rest is installed in the upper position, the lower side of the guide member is exposed and the elbow rest is If it is installed at the lower position, the upper side of the guide member may be exposed and the designability may be degraded.
　そこで、本発明は、肘掛け本体支持部に昇降可能に支持された肘掛け本体が、いずれの高さにおいても安定した状態で設置されるとともに、意匠性を向上させることができる肘掛け、背凭れおよび椅子を提供することを目的とする。 Therefore, the present invention provides an armrest, a backrest, and a chair in which the armrest main body supported by the armrest main body support portion so as to be able to move up and down is installed in a stable state at any height, and the designability can be improved. The purpose is to provide.
　上記目的を達成するため、本発明の第１の態様に係る肘掛けは、着座者が肘を掛ける肘掛け本体と、椅子の支持構造体に支持され前記肘掛け本体が上下方向に昇降可能に取り付けられる肘掛け本体支持部と、を有し、前記肘掛け本体支持部は、第１係合部を有し、前記肘掛け本体は、上下方向に延びて上端部と下端部との間に前記第１係合部が配され、前記第１係合部に上下方向に摺動可能に係止される第２係合部と、前記第２係合部および前記第２係合部を係止する前記第１係合部を覆うカバー部と、を有する。 In order to achieve the above object, an armrest according to a first aspect of the present invention is an armrest main body on which a seated person rests an elbow, and an armrest supported by a support structure of a chair so that the armrest main body can be vertically moved up and down. A main body support portion, the armrest main body support portion includes a first engaging portion, and the armrest main body extends in the up-down direction and is located between the upper end portion and the lower end portion. And a second engaging portion that is locked to the first engaging portion so as to be slidable in the vertical direction, and the first engaging portion that locks the second engaging portion and the second engaging portion. And a cover portion that covers the joint portion.
　また、本発明の第２の態様に係る背凭れは、着座者が背を凭せ掛ける背凭れ本体と、上記第１の態様の肘掛けと、を有し、前記肘掛け本体が前記背凭れ本体の幅方向の外側に配置されている。 A backrest according to a second aspect of the present invention includes a backrest body on which a seated person leans his back, and an armrest according to the first aspect, wherein the armrest body is the backrest body. It is arranged outside in the width direction.
　また、本発明の第３の態様に係る椅子は、上記第１の態様の肘掛けを有する。 The chair according to the third aspect of the present invention has the armrest of the first aspect.
　本発明の上記第１～第３の態様では、肘掛け本体が肘掛け本体支持部に対して上下方向に昇降した際に、肘掛け本体の第１係合部が、肘掛け本体支持部の第２係合部の上部側のみや下部側のみでなく、常に肘掛け本体支持部の上下方向の全体に支持された状態となる。これにより、肘掛け本体を肘掛け本体支持部に対するいずれの高さにおいても安定した状態に設置することができる。
　また、第１係合部および第２係合部が、カバー部の内部に配置されていることにより、第１係合部と第２係合部との係合部分がカバー部の外部に露出することを防止することができ、第１係合部と第２係合部との係合部分に人や物が接触する虞がなく安全性を向上させることができるとともに、意匠性を向上させることができる。 In the first to third aspects of the present invention, when the armrest main body moves up and down with respect to the armrest main body support portion, the first engagement portion of the armrest main body engages with the second engagement portion of the armrest main body support portion. The armrest main body support is always supported not only on the upper side and the lower side of the section but also in the entire vertical direction. Accordingly, the armrest main body can be installed in a stable state at any height with respect to the armrest main body support portion.
Further, since the first engaging portion and the second engaging portion are arranged inside the cover portion, the engaging portion between the first engaging portion and the second engaging portion is exposed to the outside of the cover portion. Can be prevented, safety can be improved without concern that a person or an object may contact the engaging portion between the first engaging portion and the second engaging portion, and designability can be improved. be able to.
　また、本発明の第１の態様に係る肘掛けは、前記第２係合部を前記第１係合部に対して上下方向の複数の位置に固定可能な高さ位置固定部を有し、前記高さ位置固定部は、前記カバー部の内部に配置されていてもよい。
　このような構成とすることにより、高さ位置固定部がカバー部の外部に露出することを防止することができ、高さ位置固定部に人や物が接触する虞がなく安全性を向上させることができるとともに、意匠性を向上させることができる。 The armrest according to the first aspect of the present invention has a height position fixing portion capable of fixing the second engaging portion at a plurality of vertical positions with respect to the first engaging portion, The height position fixing portion may be arranged inside the cover portion.
With this configuration, the height position fixing portion can be prevented from being exposed to the outside of the cover portion, and there is no possibility that a person or an object will come into contact with the height position fixing portion, which improves safety. It is possible to improve the design.
　また、本発明の第１の態様に係る肘掛けは、前記第１係合部が前記第２係合部の前記上端部と前記下端部との間に配された前記第２係合部の摺動可能範囲よりも上方への移動を規制する上側規制部と、前記第２係合部の前記摺動可能範囲よりも下方への移動を規制する下側規制部と、を有し、前記上側規制部および前記下側規制部は前記カバー部と連結されていてもよい。
　このような構成とすることにより、肘掛け本体の上下方向の移動を規制することができる。そして、上側規制部および下側規制部がカバー部と連結されていることにより、肘掛け本体の上下方向の移動を規制することによって上側規制部または下側規制部に衝撃が生じた場合に、この衝撃をカバー部も負担することができ、肘掛け本体を強固な構造とすることができる。 Further, in the armrest according to the first aspect of the present invention, the first engaging portion is a slide of the second engaging portion in which the first engaging portion is arranged between the upper end portion and the lower end portion of the second engaging portion. An upper side restricting portion that restricts a movement above the movable range and a lower side restricting portion that restricts a movement of the second engaging portion below the slidable range; The restriction part and the lower restriction part may be connected to the cover part.
With such a configuration, the vertical movement of the armrest main body can be restricted. And, when the upper side regulation part and the lower side regulation part are connected to the cover part, when the upper side regulation part or the lower side regulation part is impacted by regulating the vertical movement of the armrest main body, this The cover part can bear the impact, and the armrest main body can have a strong structure.
　本発明によれば、肘掛け本体支持部に昇降可能に支持された肘掛け本体が、いずれの高さにおいても安定した状態で設置されるとともに、意匠性を向上させることができる。 According to the present invention, the armrest main body supported by the armrest main body support portion so as to be able to move up and down is installed in a stable state at any height, and the designability can be improved.
本発明の実施形態による椅子の一例を示す斜視図である。It is a perspective view showing an example of a chair by an embodiment of the present invention. 本発明の実施形態による椅子の正面図である。1 is a front view of a chair according to an embodiment of the present invention. 本発明の実施形態による椅子の背面図である。FIG. 3 is a rear view of the chair according to the embodiment of the present invention. 背凭れ支持部と外周枠部の連結構造を示す斜視図である。It is a perspective view showing a connecting structure of a backrest support portion and an outer peripheral frame portion. 背凭れ支持部の斜視図である。It is a perspective view of a backrest support part. 図４のＡ－Ａ線断面図である。FIG. 5 is a sectional view taken along line AA of FIG. 4. 図４のＢ－Ｂ線断面図である。FIG. 5 is a sectional view taken along line BB of FIG. 4. 図４のＣ－Ｃ線断面図である。FIG. 5 is a sectional view taken along line CC of FIG. 4. 図４のＤ－Ｄ線断面図である。FIG. 5 is a sectional view taken along the line DD of FIG. 4. 外周枠部の斜め前方から見た斜視図である。It is the perspective view seen from the diagonal front of the peripheral frame part. 外周枠部の斜め後方から見た斜視図である。It is the perspective view seen from the diagonal back of the peripheral frame part. 肘掛けの斜視図である。It is a perspective view of an armrest. 肘掛けの分解斜視図である。It is an exploded perspective view of an armrest. 肘掛け本体支持部の斜視図である。It is a perspective view of an armrest main-body support part. 前側部材を後方から見た斜視図である。It is the perspective view which looked at the front member from the back. 後側部材を前方から見た斜視図である。It is the perspective view which looked at the back member from the front. 図１４のＧ－Ｇ線断面図である。It is the GG sectional view taken on the line of FIG. 肘掛け本体の斜視図である。It is a perspective view of an armrest main body. 肘掛け本体カバー部を省略した肘掛け本体の斜視図である。It is a perspective view of the armrest main body which omitted the armrest main body cover part. レール部材および高さ位置拘束手段の斜視図である。It is a perspective view of a rail member and height position restraint means. 図２０の分解図である。It is an exploded view of FIG. 図１８のＨ－Ｈ線断面図である。FIG. 19 is a sectional view taken along line HH of FIG. 18. 通常状態の高さ位置拘束手段を示す図である。It is a figure which shows the height position restraint means of a normal state. 操作状態の高さ位置拘束手段を示す図である。It is a figure which shows the height position restraint means of an operation state. 図１２のＩ－Ｉ線断面図である。FIG. 13 is a sectional view taken along line II of FIG. 12. レール部材と前側部材および後側部材とが連結された様子を説明する図である。It is a figure explaining the mode that the rail member and the front side member and the back side member were connected. 下側内板部が取り付けられた様子を示す図である。It is a figure which shows a mode that the lower inner plate part was attached. カバーの本体部が取り付けられた様子を示す図である。It is a figure which shows a mode that the main-body part of the cover was attached. 最上位置にある肘掛け本体を説明する図である。It is a figure explaining the armrest main body in the uppermost position. 最上位置にある肘掛け本体を説明する図である。It is a figure explaining the armrest main body in the uppermost position.
　以下、本発明の実施形態による背凭れおよび椅子について、図１－３０に基づいて説明する。
　図１－図３に示すように、本実施形態による椅子１は、支持構造体２と、座部３と、背凭れ４と、を有している。
　以下の説明において、椅子１に着座した着座者が前を向く方向を前側、その反対側を後側とし、前側と後側とを結ぶ水平方向を前後方向とする。また、前後方向に直交する水平方向を幅方向とする。椅子１は、幅方向に対称な形状となっている。幅方向について、椅子１全体における幅方向の中央に対する幅方向の両端側を「幅方向の外側」と表記し、幅方向の端部に対する幅方向の中央側を「幅方向の内側」と表記することがある（図２および図３参照）。 Hereinafter, a backrest and a chair according to an embodiment of the present invention will be described with reference to FIGS. 1-30.
As shown in FIGS. 1 to 3, the chair 1 according to the present embodiment includes a support structure 2, a seat portion 3, and a backrest 4.
In the following description, the direction in which a seated person sitting on the chair 1 faces forward is the front side, the opposite side is the rear side, and the horizontal direction connecting the front side and the rear side is the front-back direction. Further, the horizontal direction orthogonal to the front-rear direction is the width direction. The chair 1 has a shape symmetrical in the width direction. Regarding the width direction, both widthwise ends of the entire chair 1 with respect to the center of the widthwise direction are referred to as “widthwise outsides”, and the widthwise center side with respect to the widthwise ends is referred to as “widthwise insides”. Sometimes (see FIGS. 2 and 3).
　支持構造体２は、脚体２１と、脚柱２２と、支基２３と、背凭れ支持部２４と、を有している。
　脚体２１は、平面視で放射状に配置された複数の脚杆２１１を有している。各脚杆２１１の先端部には、それぞれ床面に接地するキャスタ２１２が設けられている。
　脚柱２２は、脚体２１の中央に立設している。脚柱２２は、ガススプリングを内蔵した伸縮式で、脚体２１に固定された外筒２２１と、外筒２２１に挿通され外筒２２１よりも上側に延びる内筒２２２と、を有ししている。内筒２２２は、外筒２２１に対して昇降可能に構成されているとともに、外筒２２１と相対回転可能に構成されている。 The support structure 2 includes a leg 21, a pillar 22, a support base 23, and a backrest support portion 24.
The leg 21 has a plurality of leg rods 211 arranged radially in a plan view. A caster 212 is provided at the tip of each leg rod 211 for grounding on the floor surface.
The pedestal 22 is erected at the center of the leg body 21. The pedestal 22 is a telescopic type having a built-in gas spring, and has an outer cylinder 221 fixed to the leg 21 and an inner cylinder 222 inserted into the outer cylinder 221 and extending above the outer cylinder 221. There is. The inner cylinder 222 is configured to be movable up and down with respect to the outer cylinder 221, and is configured to be rotatable relative to the outer cylinder 221.
　支基２３は、脚柱２２の上端部に固定されている。支基２３の上部には、座部３が配置され、支基２３の後部には、背凭れ支持部２４が配置されている。
　支基２３は、背凭れ４を支持する背凭れ支持部２４を傾動可能（回動可能）に支持するとともに、着座面を形成する座部３を背凭れ支持部２４と連動して傾動可能に支持している。 The support base 23 is fixed to the upper end of the pedestal 22. The seat portion 3 is arranged above the support base 23, and the backrest support portion 24 is arranged behind the support base 23.
The support base 23 tiltably (rotatably) supports a backrest support portion 24 that supports the backrest 4, and the seat portion 3 that forms a seating surface can be tilted in conjunction with the backrest support portion 24. I support you.
（背凭れ支持部）
　図４－図５に示すように、背凭れ支持部２４は、支基２３（図１－図３参照）に連結され支基２３よりも後方に延びる下側フレーム２４１と、下側フレーム２４１の後端部から上方に延びる後側フレーム２４２と、を有している。下側フレーム２４１と後側フレーム２４２とは、一体に形成されている。背凭れ支持部２４は、幅方向から見た側面視でＬ字形状をなしている。 (Backrest support)
As shown in FIGS. 4 to 5, the backrest support portion 24 includes a lower frame 241 connected to the support base 23 (see FIGS. 1 to 3) and extending rearward from the support base 23, and a lower frame 241. And a rear frame 242 that extends upward from the rear end portion. The lower frame 241 and the rear frame 242 are integrally formed. The backrest support portion 24 has an L shape in a side view as seen from the width direction.
　下側フレーム２４１は、それぞれ前後方向に延びて幅方向に間隔をあけて配置された一対の後方延出部２４３と、一対の後方延出部２４３の前後方向の中間部同士を連結する下側連結部２４４とを有している。一対の後方延出部２４３のうちの幅方向の一方側の後方延出部２４３は、前端部が支基２３の幅方向の一方側に連結され、幅方向の他方側の後方延出部２４３は、前端部が支基２３の幅方向の他方側に連結されている。 The lower frame 241 connects the pair of rear extending portions 243, which extend in the front-rear direction and are arranged at intervals in the width direction, and the middle portion of the pair of rear extending portions 243 in the front-rear direction, to each other. And a connecting portion 244. The rear extending portion 243 on one side in the width direction of the pair of rear extending portions 243 has a front end portion connected to one side in the width direction of the support base 23, and the rear extending portion 243 on the other side in the width direction. Has a front end connected to the other side of the support base 23 in the width direction.
　後側フレーム２４２は、一対の後方延出部２４３の後端部から上側に向かって漸次前側に向かう方向に延びる一対の上方延出部２４５と、一対の上方延出部２４５の上端部同士を連結する上側連結部２４６と、を有している。
　上側連結部２４６は、幅方向の全体にわたって幅方向の中央が後側に凹むように湾曲している。 The rear frame 242 has a pair of upper extension portions 245 extending from the rear end portions of the pair of rear extension portions 243 toward the upper side in an upward direction and upper end portions of the pair of upper extension portions 245. And an upper coupling portion 246 that couples with each other.
The upper connecting portion 246 is curved so that the center in the width direction is recessed rearward over the entire width direction.
　一対の上方延出部２４５は、幅方向に間隔をあけて設けられている。一対の上方延出部２４５のうちの一方の上方延出部２４５は、椅子１の幅方向の中央よりも幅方向の一方側に位置し、他方の上方延出部２４５は、椅子１の幅方向の中央よりも幅方向の他方側に位置している。このため、一対の上方延出部２４５は、互いに対向する側が幅方向の内側となり、互いに離間する側が幅方向の外側となる。
　一対の上方延出部２４５は、下側から上側に向かって漸次前側に向かう方向に延びる棒状に形成され背凭れ４が固定される連結部５と、連結部５の後縁部５７から幅方向の外側に突出する突出板部２６と、をそれぞれ有している。 The pair of upward extending portions 245 are provided at intervals in the width direction. One upper extension portion 245 of the pair of upper extension portions 245 is located closer to one side in the width direction than the center of the chair 1 in the width direction, and the other upper extension portion 245 is the width of the chair 1. It is located on the other side in the width direction than the center in the direction. Therefore, in the pair of upward extending portions 245, the sides facing each other are the inner sides in the width direction, and the sides separated from each other are the outer sides in the width direction.
The pair of upward extending portions 245 are formed in a rod shape extending from the lower side to the upper side in the direction toward the front side gradually, and the connecting portion 5 to which the backrest 4 is fixed, and the rear edge portion 57 of the connecting portion 5 from the width direction. And a projecting plate portion 26 projecting to the outside.
　図５に示すように、連結部５には、溝状や、凹状、孔状の肉抜き部が適宜形成されている。連結部５の外周面は、概ね前側を向く面を連結部前面５１と、概ね後方を向く面を連結部後面５２と、概ね幅方向の内側を向く面を連結部内側面５３と、概ね幅方向の外側を向く面を連結部外側面５４と、から構成されている。「・・側を向く面」や、「・・方向を向く面」とは、その法線が「・・側」や「・・方向に」に延びている面を示している。 As shown in FIG. 5, the connecting portion 5 is appropriately formed with a groove-shaped, concave-shaped, or hole-shaped lightening portion. The outer peripheral surface of the connecting portion 5 has a connecting portion front surface 51 with a surface facing substantially forward, a connecting portion rear surface 52 with a surface facing substantially rearward, a connecting portion inner surface 53 with a surface facing generally inward in the width direction, and a substantially width direction. The outer surface of the connecting portion is formed of the connecting portion outer surface 54. The "face facing the .." and the "face facing the .. direction" refer to faces whose normals extend in the ".. side" or "in the .. direction".
　連結部後面５２は、下側から上側に向かって漸次前側に向かうとともに、幅方向の外側から内側に向かって漸次後側に向かう面に形成されている。連結部後面５２は、上側連結部２４６の後面と角部や段差なく連続している。
　連結部前面５１は、下側から上側に向かって漸次前側に向かうとともに、幅方向の外側から内側に向かって漸次後側に向かう面に形成されている。連結部前面５１は、連結部後面５２とほぼ平行となっている。 The connecting portion rear surface 52 is formed on a surface that gradually extends from the lower side to the upper side toward the front side and gradually extends from the outer side to the inner side in the width direction toward the rear side. The rear surface 52 of the connecting portion is continuous with the rear surface of the upper connecting portion 246 without corners or steps.
The connecting portion front surface 51 is formed on a surface that gradually extends from the lower side to the upper side toward the front side and gradually extends from the outer side to the inner side in the width direction toward the rear side. The front surface 51 of the connecting portion is substantially parallel to the rear surface 52 of the connecting portion.
　連結部内側面５３は、後端部近傍が幅方向の内側よりもやや後側を向く面に形成され、それよりも前側の部分が幅方向の内側を向く面に形成されている。
　連結部外側面５４は、後側から前側に向かって漸次幅方向の内側に向かう面に形成されている。連結部外側面５４は、連結部後面５２および連結部前面５１と略直交する面となっている。
　連結部５は、後側から前側に向かって漸次幅方向の寸法が小さくなっている。 The inner side surface 53 of the connecting portion is formed such that the vicinity of the rear end portion is slightly facing the inner side in the width direction, and the front portion thereof is formed in the surface facing the inner side in the width direction.
The connecting portion outer surface 54 is formed on a surface that gradually extends inward in the width direction from the rear side to the front side. The connecting portion outer surface 54 is a surface that is substantially orthogonal to the connecting portion rear surface 52 and the connecting portion front surface 51.
The size of the connecting portion 5 gradually decreases from the rear side to the front side.
　連結部５には、背凭れ４の背凭れ本体４１を固定する第１ボルト６１（図６および図７参照）が挿入される第１孔部５５が上下方向に間隔をあけて２つ形成され、背凭れ４の肘掛け本体支持部７２を固定する第２ボルト６２（図８および図９参照）が挿入される第２孔部５６が上下方向に間隔をあけて２つ形成されている。
　２つの第２孔部５６は、２つの第１孔部５５の間に形成されている。 Two first hole portions 55, into which the first bolts 61 (see FIGS. 6 and 7) for fixing the backrest body 41 of the backrest 4 are inserted, are formed in the connecting portion 5 at intervals in the vertical direction. Two second hole portions 56, into which the second bolts 62 (see FIGS. 8 and 9) for fixing the armrest main body support portion 72 of the backrest 4 are inserted, are formed at intervals in the vertical direction.
The two second hole portions 56 are formed between the two first hole portions 55.
　図６および図７に示すように、連結部５には、上下方向に間隔をあけた２か所それぞれに、前側開口する前側凹部５５１と、前側凹部５５１の後側に位置し後側に開口する後側凹部５５２と、が形成されている。前側凹部５５１と後側凹部５５２とは、中間板部５５３を介して略前後方向に並んで配置されている。中間板部５５３は、板面が前後方向を向く板状に形成され、正面視における中央部分に前後方向に貫通する孔部が形成されている。この孔部が第１孔部５５となっている。
　図５に戻り、連結部５は、上側に位置する前側凹部５５１の上部に切込み部５５４が形成されていて、切込み部５５４を介して前側凹部５５１の内部が連結部５の上方に連通するように構成されている。切込み部５５４は、前側凹部５５１における幅方向の外側部分の上部に位置している。 As shown in FIG. 6 and FIG. 7, in the connecting portion 5, front concave portions 551 that open to the front and two concave portions that are located on the rear side of the front concave portions 551 and open to the rear side are provided at two places vertically spaced apart from each other. And a rear concave portion 552 which is formed. The front concave portion 551 and the rear concave portion 552 are arranged side by side substantially in the front-rear direction with the intermediate plate portion 553 interposed therebetween. The intermediate plate portion 553 is formed in a plate shape whose plate surface faces the front-rear direction, and has a hole portion penetrating in the front-rear direction in the central portion in a front view. This hole is the first hole 55.
Returning to FIG. 5, the connecting portion 5 has a notch portion 554 formed in an upper portion of the front concave portion 551 located on the upper side, and the inside of the front concave portion 551 communicates with the upper portion of the connecting portion 5 via the notch portion 554. Is configured. The notch 554 is located above the widthwise outer portion of the front recess 551.
　図８および図９に示すように、連結部５には、２つの第１孔部５５（図５参照）の間に、上下方向に間隔をあけた２か所それぞれに、幅方向の内側に開口する内側凹部５６１が形成されている。本実施形態では、内側凹部５６１は後方にも開口している。内側凹部５６１の底面５６２は、前側から後側に向かって漸次幅方向の外側に向かう面に形成されている。内側凹部５６１の底面５６２は、連結部外側面５４と平行に配置されている。 As shown in FIG. 8 and FIG. 9, in the connecting portion 5, two first hole portions 55 (see FIG. 5) are provided at two places vertically spaced apart from each other, and are provided on the inner side in the width direction. An inner concave portion 561 that opens is formed. In the present embodiment, the inner concave portion 561 is also open rearward. A bottom surface 562 of the inner recessed portion 561 is formed on a surface that gradually extends outward in the width direction from the front side toward the rear side. A bottom surface 562 of the inner concave portion 561 is arranged in parallel with the connecting portion outer surface 54.
　連結部５には、内側凹部５６１の底面５６２から連結部外側面５４まで貫通する孔部が形成されている。この孔部が第２孔部５６となっている。第２孔部５６は、幅方向の内側から外側に向かって漸次前側に向かう斜め方向に連結部５を貫通している。第２孔部５６の貫通方向は、連結部前面５１、連結部後面５２に沿った方向で、幅方向の内側から外側に向かって漸次前側に向かう第１斜め方向となっている。
　第１斜め方向は、幅方向の内側から外側に向かって漸次前側に向かう方向、およびその反対側となる幅方向の外側から内側に向かって漸次後側に向かう方向を示している。第１斜め方向は、略水平方向となっている。
　第１斜め方向における幅方向の内側から外側に向かって漸次前側に向かう側を外側とし、反対側となる幅方向の外側から内側に向かって漸次後側に向かう側を内側とする。 The connecting portion 5 is formed with a hole penetrating from the bottom surface 562 of the inner concave portion 561 to the connecting portion outer surface 54. This hole is the second hole 56. The second hole portion 56 penetrates the connecting portion 5 in an oblique direction from the inner side to the outer side in the width direction and gradually toward the front side. The penetrating direction of the second hole portion 56 is a direction along the connecting portion front surface 51 and the connecting portion rear surface 52, and is a first oblique direction that gradually advances from the inner side to the outer side in the width direction toward the front side.
The first diagonal direction indicates a direction from the inner side to the outer side in the width direction gradually toward the front side, and a direction opposite to the opposite direction from the outer side to the inner side in the width direction gradually toward the rear side. The first diagonal direction is substantially horizontal.
The side that gradually progresses from the inner side to the outer side in the first diagonal direction toward the outer side is defined as the outer side, and the side that gradually faces the inner side from the outer side in the width direction toward the inner side toward the rear side is defined as the inner side.
　図５、図８、図９に示すように、突出板部２６は、連結部５の後縁部５７から第１斜め方向に突出する板状に形成され、その面が上側連結部２４６の湾曲に沿った面となっている。突出板部２６の後面２６１は、連結部後面５２と段差や屈曲部４６２を介さず滑らかに連続している。突出板部２６の前面２６２は、第２孔部５６よりも後側に位置している。これにより、突出板部２６は、第２孔部５６と干渉しないように構成されている。突出板部２６は、上側から下側に向かって連結部５から幅方向の外側に突出する寸法が短くなっていて、板面が上側から下側に向かって幅方向の寸法が漸次短くなる略三角形状となっている。 As shown in FIGS. 5, 8 and 9, the protruding plate portion 26 is formed in a plate shape protruding in the first oblique direction from the rear edge portion 57 of the connecting portion 5, and the surface thereof is curved to the upper connecting portion 246. It is a surface along. The rear surface 261 of the projecting plate portion 26 is smoothly continuous with the rear surface 52 of the connecting portion without any step or bent portion 462. The front surface 262 of the projecting plate portion 26 is located rearward of the second hole portion 56. Thereby, the projecting plate portion 26 is configured not to interfere with the second hole portion 56. The projecting plate portion 26 has a shorter dimension that projects outward from the connecting portion 5 in the width direction from the upper side to the lower side, and the dimension of the plate surface in the width direction gradually decreases from the upper side to the lower side. It has a triangular shape.
（背凭れ）
　図１－図４に示すように、背凭れ４は、背凭れ支持部２４の後側フレーム２４２の前側に配置されている。
　背凭れ４は、着座者が背を凭せ掛ける背凭れ本体４１と、背凭れ本体４１の幅方向の外側に配置され着座者が肘を掛ける肘掛け７と、を有している。
　背凭れ本体４１は、内側に開口部４２１が形成された四角枠状の外周枠部４２と、開口部４２１を覆い外周枠部４２に係止される面材４３（図１－図３参照）と、を有している。図４では、面材４３を省略している。
　面材４３は、メッシュや布などの膜状の部材で構成され、外周枠部４２の前側から見た正面視形状よりも大きく形成されて、外縁部が外周枠部４２に係止されている。 (Back)
As shown in FIGS. 1 to 4, the backrest 4 is disposed on the front side of the rear frame 242 of the backrest support portion 24.
The backrest 4 has a backrest main body 41 on which the seated person leans his back, and an armrest 7 arranged outside the backrest main body 41 in the width direction and on which the seated person rests his elbow.
The backrest main body 41 has a rectangular frame-shaped outer peripheral frame portion 42 having an opening 421 formed therein, and a face material 43 that covers the opening 421 and is locked to the outer peripheral frame portion 42 (see FIGS. 1 to 3). And have. In FIG. 4, the face material 43 is omitted.
The face material 43 is formed of a film-shaped member such as a mesh or a cloth, is formed to be larger than the front view shape of the outer peripheral frame portion 42 as viewed from the front side, and has an outer edge portion locked to the outer peripheral frame portion 42. .
　図４、図１０、図１１に示すように、外周枠部４２は、上枠部４４、下枠部４５と、一対の縦枠部４６と、を有している。
　一対の縦枠部４６は、幅方向に間隔をあけて設けられている。一対の縦枠部４６のうちの一方の縦枠部４６は、椅子１の幅方向の中央よりも幅方向の一方側に位置し、他方の縦枠部４６は、椅子１の幅方向の中央よりも幅方向の他方側に位置している。このため、一対の縦枠部４６は、互いに対向する側が幅方向の内側となり、互いに離間する側が幅方向の外側となる。 As shown in FIGS. 4, 10, and 11, the outer peripheral frame portion 42 has an upper frame portion 44, a lower frame portion 45, and a pair of vertical frame portions 46.
The pair of vertical frame portions 46 are provided at intervals in the width direction. One vertical frame portion 46 of the pair of vertical frame portions 46 is located on one side in the width direction with respect to the widthwise center of the chair 1, and the other vertical frame portion 46 is the widthwise center of the chair 1. It is located on the other side in the width direction. Therefore, in the pair of vertical frame portions 46, the sides facing each other are the inside in the width direction, and the sides separated from each other are the outside in the width direction.
　上枠部４４は、幅方向に延びる部材で、正面視で幅方向の中央が上側に張り出すとともに、上側から見た平面視で幅方向の中央が後側に張り出すように幅方向全体にわたって湾曲している。上枠部４４には、面材４３（図１－図３参照）の上縁部を係止する上枠面材係止溝部４４１が形成されている。上枠面材係止溝部４４１は、上側に開口する溝部で、上枠部４４の幅方向全体にわたって形成されている。
　下枠部４５は、幅方向に延びる部材で、正面視で幅方向の中央が下側に張り出すとともに、平面視で幅方向の中央が後側に張り出すように幅方向全体にわたって湾曲している。下枠部４５には、面材４３の下縁部を係止する下枠面材係止溝部４５１が形成されている。下枠面材係止溝部４５１は、下側に開口する溝部で、下枠部４５の幅方向全体にわたって形成されている。 The upper frame portion 44 is a member that extends in the width direction, and extends over the entire width direction such that the center in the width direction projects upward in a front view and the center in the width direction projects rearward in a plan view seen from above. It is curved. The upper frame portion 44 is formed with an upper frame surface material locking groove portion 441 that locks an upper edge portion of the surface material 43 (see FIGS. 1 to 3). The upper frame surface material locking groove portion 441 is a groove portion that opens upward and is formed over the entire width direction of the upper frame portion 44.
The lower frame portion 45 is a member extending in the width direction, and is curved over the entire width direction such that the center in the width direction projects downward in a front view and the center in the width direction projects rearward in a plan view. There is. In the lower frame portion 45, a lower frame surface material locking groove portion 451 that locks the lower edge portion of the surface material 43 is formed. The lower frame surface material locking groove portion 451 is a groove portion that opens downward and is formed over the entire width direction of the lower frame portion 45.
　一対の縦枠部４６は、上下方向の中間部に屈曲部４６２が形成されている。
　一対の縦枠部４６は、幅方向から見た側面視で、屈曲部４６２よりも下側の部分が下側から上側に向かって漸次前側に向かう方向に延び、屈曲部４６２よりも上側の部分が下側から上側に向かって漸次後側に向かう方向に延びている。また、一対の縦枠部４６は、正面視で屈曲部４６２よりも下側が下側から上側に向かって漸次幅方向の外側に向かう方向に延び、屈曲部４６２よりも上側が下側から上側に向かって漸次幅方向の内側に向かう方向に延びている。屈曲部４６２は、一対の縦枠部４６それぞれの上下方向の中央よりも下側に位置している。 The pair of vertical frame portions 46 has a bent portion 462 formed at an intermediate portion in the vertical direction.
The pair of vertical frame portions 46, in a side view seen from the width direction, a portion below the bending portion 462 extends in a direction from the lower side to the upper side gradually toward the front side, and a portion above the bending portion 462. Extends from the lower side to the upper side in a direction gradually toward the rear side. Further, in the pair of vertical frame portions 46, the lower side of the bent portion 462 extends in a direction from the lower side to the upper side gradually toward the outer side in the width direction in a front view, and the upper side of the bent portion 462 extends from the lower side to the upper side. Toward the inner side in the width direction. The bent portion 462 is located below the vertical center of each of the pair of vertical frame portions 46.
　一対の縦枠部４６は、それぞれ面材４３を係止する面材係止部４６３と、面材係止部４６３と連続して形成され、背凭れ支持部２４に固定される背凭れ連結部４６４と、面材係止部４６３から後側に突出するリブ４６５と、を有している。 The pair of vertical frame portions 46 are respectively formed with a face material locking portion 463 that locks the face material 43 and the face material locking portion 463, and is fixed to the backrest support portion 24. It has a portion 464 and a rib 465 protruding rearward from the surface material locking portion 463.
　面材係止部４６３は、縦枠部４６の上下方向全体にわたって設けられていて、上端部が上枠部４４と接続され、下端部が下枠部４５と接続されている。一対の縦枠部４６のうちの一方の縦枠部４６の面材係止部４６３は、上端部が上枠部４４の幅方向の一方側の端部と接続され、下端部が下枠部４５の幅方向の一方側の端部と接続されている。一対の縦枠部４６のうちの他方の縦枠部４６の面材係止部４６３は、上端部が上枠部４４の幅方向の他方側の端部と接続され、下端部が下枠部４５の幅方向の他方側の端部と接続されている。 The face material locking portion 463 is provided over the entire vertical direction of the vertical frame portion 46, and the upper end portion is connected to the upper frame portion 44 and the lower end portion is connected to the lower frame portion 45. The face material locking portion 463 of one vertical frame portion 46 of the pair of vertical frame portions 46 has an upper end portion connected to one end portion in the width direction of the upper frame portion 44, and a lower end portion being a lower frame portion. It is connected to one end portion of the width direction 45. The face material locking portion 463 of the other vertical frame portion 46 of the pair of vertical frame portions 46 has an upper end portion connected to the other end portion in the width direction of the upper frame portion 44 and a lower end portion that is a lower frame portion. It is connected to the other end of the width direction 45.
　面材係止部４６３には、面材４３の側縁部を係止する縦枠面材係止溝部４６１が形成されている。縦枠面材係止溝部４６１は、幅方向の内側に開口する溝部で、上下方向全体にわたって形成されている。
　一対の縦枠面材係止溝部４６１は、それぞれ上枠面材係止溝部４４１および下枠面材係止溝部４５１と連続している。これにより、外周枠部４２には、外周部全体にわたって面材４３を係止するための溝部が形成されている。 A vertical frame surface material locking groove portion 461 for locking the side edge portion of the surface material 43 is formed in the surface material locking portion 463. The vertical frame surface member locking groove portion 461 is a groove portion that opens inward in the width direction and is formed over the entire vertical direction.
The pair of vertical frame surface material locking groove portions 461 are respectively continuous with the upper frame surface material locking groove portion 441 and the lower frame surface material locking groove portion 451. As a result, the outer peripheral frame portion 42 is formed with a groove portion for locking the face material 43 over the entire outer peripheral portion.
　図１０および図１１に示すように、背凭れ連結部４６４は、縦枠部４６における屈曲部４６２よりも下側の部分全体に設けられている。背凭れ連結部４６４は、面材係止部４６３の幅方向の内側に設けられている。背凭れ連結部４６４の下端部は、下枠部４５と接続されている。
　背凭れ連結部４６４は、面材係止部４６３の屈曲部４６２よりも下側の部分の後縁部から幅方向の内側に向かって漸次後側に延びる連結板部４７と、連結板部４７から後側に突出する連結突出部４８と、を有している。 As shown in FIGS. 10 and 11, the backrest connecting portion 464 is provided in the entire portion of the vertical frame portion 46 below the bending portion 462. The backrest connecting portion 464 is provided inside the face material locking portion 463 in the width direction. The lower end of the backrest connecting portion 464 is connected to the lower frame portion 45.
The backrest connecting portion 464 includes a connecting plate portion 47 that gradually extends rearward inward in the width direction from a rear edge portion of a portion below the bending portion 462 of the face material locking portion 463, and a connecting plate portion 47. And a connecting protrusion 48 that protrudes to the rear side.
　連結板部４７は、上下方向に延びる長尺に形成され、下端部が下枠部４５と接続されている。連結板部４７は、前方を向く連結板部前面４７１が前後方向の前側よりもやや幅方向の内側を向く面となり、後方を向く連結板部後面４７２が前後方向の後側よりもやや幅方向の外側を向く面となっている。連結板部４７は、平面視において下枠部４５に沿った形状に形成されている。 The connecting plate portion 47 is formed in an elongated shape extending in the vertical direction, and the lower end portion is connected to the lower frame portion 45. In the connecting plate part 47, the connecting plate part front surface 471 that faces the front is a surface that faces slightly inward in the width direction rather than the front side in the front-rear direction, and the connecting plate part rear surface 472 that faces rearward is slightly in the width direction than the rear side in the front-rear direction. It is a surface that faces the outside of. The connecting plate part 47 is formed in a shape along the lower frame part 45 in a plan view.
　連結突出部４８は、１つの連結板部４７に対して上下方向に間隔をあけて２つ設けられている。図１１に示すように、連結突出部４８は、連結板部４７から後側に突出する筒状部４８１と、筒状部４８１の先端部（後端部）を覆うように接続された先端板部４８２と、を有している。先端板部４８２は、板面が前後方向を向く平板状に形成され、板面の中央に前後方向に貫通する第３孔部４８３が形成されている。
　図６および図７に示すように、連結突出部４８は、背凭れ支持部２４の連結部５の前側凹部５５１に前側から嵌合する形状に形成されている。連結突出部４８は、背凭れ支持部２４の連結部５の前側凹部５５１に嵌合すると、第３孔部４８３が前側凹部５５１の第１孔部５５と前後方向に重なるように設定されている。 Two connecting protrusions 48 are provided in the vertical direction with respect to one connecting plate 47. As shown in FIG. 11, the connecting protrusion 48 has a tubular portion 481 protruding rearward from the connecting plate portion 47, and a tip plate connected to cover the tip portion (rear end portion) of the tubular portion 481. And a portion 482. The tip plate portion 482 is formed in a flat plate shape with its plate surface facing the front-rear direction, and has a third hole portion 483 penetrating in the front-rear direction in the center of the plate surface.
As shown in FIGS. 6 and 7, the connecting protrusion 48 is formed in a shape that fits into the front recess 551 of the connecting portion 5 of the backrest support 24 from the front side. The connecting protrusion 48 is set such that the third hole 483 overlaps with the first hole 55 of the front recess 551 in the front-rear direction when fitted into the front recess 551 of the connecting portion 5 of the backrest support 24. .
　図１１に示すように、リブ４６５は、縦枠部４６の上下方向の中間部分で、屈曲部４６２およびその上下の領域を含む部分に設けられている。リブ４６５は、板面が幅方向を向く板状に形成されている。リブ４６５の下端部は、上側に配置された連結突出部４８の筒状部４８１の側面と接続されている。リブ４６５の下部側には、後方および下方に開口する切り欠き部４６６が形成されている。 As shown in FIG. 11, the rib 465 is provided in the vertical middle portion of the vertical frame portion 46 and in the portion including the bent portion 462 and the regions above and below the bent portion 462. The rib 465 is formed in a plate shape whose plate surface faces the width direction. The lower end of the rib 465 is connected to the side surface of the tubular portion 481 of the connecting protrusion 48 arranged on the upper side. On the lower side of the rib 465, a cutout portion 466 that opens rearward and downward is formed.
　図１および図２に示すように、面材４３は、外周枠部４２の内側を覆うように縦枠部４６の前側に張られ、上枠部４４、下枠部４５および一対の縦枠部４６の前面を巻きこんで、外縁部が面材係止溝部４４１，４５１，４６１に挿入されて外周枠部４２に係止されている。面材４３が形成し、着座者が背を凭せ掛ける面を背凭れ面４３１とする。背凭れ面４３１は、幅方向の中央が幅方向の外側端部よりも後側に凹むように湾曲している。
　外周枠部４２に張られた面材４３は、前方から作用した荷重によって弾性変形可能に構成されている。また、外周枠部４２も面材４３に作用した荷重によって弾性変形可能に構成されている。 As shown in FIGS. 1 and 2, the surface material 43 is stretched on the front side of the vertical frame portion 46 so as to cover the inner side of the outer peripheral frame portion 42, and the upper frame portion 44, the lower frame portion 45 and the pair of vertical frame portions are provided. The front surface of 46 is rolled up, and the outer edge portion is inserted into the surface material locking groove portions 441, 451 and 461 and locked to the outer peripheral frame portion 42. The face member 43 is formed, and the face on which the seated person leans his back is referred to as a backrest face 431. The backrest surface 431 is curved so that the center in the width direction is recessed more rearward than the outer end portion in the width direction.
The face material 43 stretched over the outer peripheral frame portion 42 is configured to be elastically deformable by the load applied from the front. The outer peripheral frame portion 42 is also configured to be elastically deformable by the load acting on the face material 43.
　外周枠部４２は、面材４３が張られた状態で背凭れ支持部２４に固定されている。外周枠部４２は、背凭れ支持部２４の後側フレーム２４２の前側に固定されている。
　図４に示すように、一対の縦枠部４６の背凭れ連結部４６４は、後側フレーム２４２における上方延出部２４５の連結部５の前側に配置されている。背凭れ連結部４６４の連結板部４７は、連結板部後面４７２が連結部５の連結部前面５１と当接している。背凭れ連結部４６４の連結突出部４８は、連結部５の前側凹部５５１に挿入されている。 The outer peripheral frame portion 42 is fixed to the backrest support portion 24 in a state where the face material 43 is stretched. The outer peripheral frame portion 42 is fixed to the front side of the rear frame 242 of the backrest support portion 24.
As shown in FIG. 4, the backrest connecting portion 464 of the pair of vertical frame portions 46 is arranged on the front side of the connecting portion 5 of the upper extension portion 245 in the rear frame 242. In the connecting plate portion 47 of the backrest connecting portion 464, the connecting plate portion rear surface 472 is in contact with the connecting portion front surface 51 of the connecting portion 5. The connecting protrusion 48 of the backrest connecting portion 464 is inserted into the front recess 551 of the connecting portion 5.
　前後方向に重なった背凭れ連結部４６４の連結突出部４８の先端板部４８２に形成された第３孔部４８３と、背凭れ支持部２４の連結部５の前側凹部５５１の第１孔部５５と、に挿通された第１ボルト６１がナットに締結されることによって、外周枠部４２が背凭れ支持部２４に連結されている。
　一対の縦枠部４６のリブ４６５は、上側の連結突出部４８と連続している下端部分が連結部５の前側凹部５５１の上側に形成された切込み部５５４に挿入され、この下端部分よりも上側の部分が連結部５の上方に配置されている。 A third hole portion 483 formed in the tip plate portion 482 of the connecting protrusion 48 of the backrest connecting portion 464 overlapping in the front-rear direction and the first hole portion 55 of the front recess 551 of the connecting portion 5 of the backrest supporting portion 24. The outer peripheral frame portion 42 is connected to the backrest support portion 24 by fastening the first bolt 61 inserted through the nut to the nut.
The ribs 465 of the pair of vertical frame portions 46 have lower end portions which are continuous with the upper connecting protrusions 48 and which are inserted into notch portions 554 formed on the upper side of the front concave portion 551 of the connecting portion 5, and which are lower than the lower end portions. The upper portion is arranged above the connecting portion 5.
　背凭れ本体４１を背凭れ支持部２４に固定するには、まず、面材４３を外周枠部４２に取り付けた状態とする。
　外周枠部４２の一対の縦枠部４６の背凭れ連結部４６４を、後側フレーム２４２における上方延出部２４５の連結部５の前側に配置する。そして、背凭れ連結部４６４の連結板部４７の連結板部後面４７２を連結部５の連結部前面５１に当接させる。また、背凭れ連結部４６４の連結突出部４８を、連結部５の前側凹部５５１に挿入する。
　このようにすることで、背凭れ連結部４６４の連結突出部４８の先端板部４８２に形成された第３孔部４８３と、背凭れ支持部２４の連結部５の前側凹部５５１の第１孔部５５と、が前後方向に重なり、これらの第１孔部５５および第３孔部４８３に第１ボルト６１を挿通し、ナット６３と締結する。これにより背凭れ本体４１が背凭れ支持部２４に連結される。なお、ナット６３は、連結突出部４８の内部に固定されていてもよい。
　このようにすると、互いに連結された背凭れ支持部２４および背凭れ本体４１との間には、背凭れ支持部２４の突出板部２６、連結部５における連結部外側面５４、および背凭れ本体４１の縦枠部４６の面材係止部４６３に囲まれて略上下方向に延びて、第１斜め方向の外側に開口する凹部２７が形成される。この凹部２７には、肘掛け７の肘掛け本体支持部７２が挿入される。 To fix the backrest main body 41 to the backrest support portion 24, first, the face material 43 is attached to the outer peripheral frame portion 42.
The backrest connecting portion 464 of the pair of vertical frame portions 46 of the outer peripheral frame portion 42 is arranged on the front side of the connecting portion 5 of the upper extending portion 245 in the rear frame 242. Then, the connecting plate portion rear surface 472 of the connecting plate portion 47 of the backrest connecting portion 464 is brought into contact with the connecting portion front surface 51 of the connecting portion 5. Further, the connecting protrusion 48 of the backrest connecting portion 464 is inserted into the front recess 551 of the connecting portion 5.
By doing so, the third hole portion 483 formed in the tip plate portion 482 of the connecting protrusion 48 of the backrest connecting portion 464 and the first hole of the front concave portion 551 of the connecting portion 5 of the backrest supporting portion 24. The portion 55 overlaps with the front-rear direction, and the first bolt 61 is inserted into the first hole portion 55 and the third hole portion 483 and fastened with the nut 63. As a result, the backrest body 41 is connected to the backrest support portion 24. The nut 63 may be fixed inside the connecting protrusion 48.
In this way, between the backrest support 24 and the backrest main body 41 that are connected to each other, the protruding plate portion 26 of the backrest support 24, the connecting portion outer surface 54 of the connection portion 5, and the backrest main body are provided. A concave portion 27 is formed which is surrounded by the face material locking portion 463 of the vertical frame portion 46 of 41 and extends substantially in the vertical direction and which is open to the outside in the first diagonal direction. The armrest main body support portion 72 of the armrest 7 is inserted into the recess 27.
（肘掛け）
　図１２および図１３に示すように、肘掛け７は、着座者が肘を掛ける肘掛け本体７１と、背凭れ支持部２４に固定され肘掛け本体７１を昇降可能に支持する肘掛け本体支持部７２と、肘掛け本体支持部７２を覆うカバー部材７３と、を有している。 (Armrest)
As shown in FIGS. 12 and 13, the armrest 7 includes an armrest main body 71 on which a seated person rests his / her arm, an armrest main body support portion 72 fixed to the backrest support portion 24 to support the armrest main body 71 so that the armrest main body 71 can be lifted and lowered, And a cover member 73 that covers the main body support portion 72.
（肘掛け本体支持部）
　図１３および図１４に示すように、肘掛け本体支持部７２は、長尺のブロック状の部材で略上下方向に延びる前側部材７４と、長尺のブロック状の部材で略上下方向に延びる向きで前側部材７４の後側に連結される後側部材７５と、を有している。前側部材７４および後側部材７５は、それぞれアルミニウム合金などの金属で成形され、ボルトなどの連結具（不図示）で連結されている。前側部材７４および後側部材７５が本発明の第１係止部に相当している。
　前側部材７４と後側部材７５とが連結された肘掛け本体支持部７２は、上下方向から見た形状が第１斜め方向に延びている。 (Armrest body support)
As shown in FIGS. 13 and 14, the armrest main body support portion 72 is a long block-shaped member that extends in the substantially vertical direction, and a long block-shaped member that extends in the substantially vertical direction. And a rear member 75 connected to the rear side of the front member 74. The front member 74 and the rear member 75 are each formed of a metal such as an aluminum alloy, and are connected by a connecting tool (not shown) such as a bolt. The front member 74 and the rear member 75 correspond to the first locking portion of the present invention.
The armrest main body support portion 72, to which the front member 74 and the rear member 75 are connected, has a shape extending in the first diagonal direction when viewed in the vertical direction.
　図１４および図１５に示すように、前側部材７４は、第１斜め方向の内側に位置する前側連結部７４１と、前側連結部７４１の前側部分から第１斜め方向の外側に向かって突出する前側突出片７４２と、を有している。
　前側連結部７４１の前方を向く面（前面７４１ａとする）および前側突出片７４２の前方を向く面（前面７４２ａとする）は、それぞれ前後方向の前側よりもやや幅方向の内側を向く面に形成されている。前側連結部７４１の前面７４１ａおよび前側突出片７４２の前面７４２ａは、第１斜め方向に沿った面に形成されている。前側連結部７４１の前面７４１ａおよび前側突出片７４２の前面７４２ａに直交する方向で、第１斜め方向に直交する方向を第２斜め方向とする。第２斜め方向のうち、前後方向の前側よりもやや幅方向の内側に向かう側を前側とし、その反対側で前後方向の後側よりもやや幅方向の外側に向かう側を後側とする。前側連結部７４１の前面７４１ａおよび前側突出片７４２の前面７４２ａは、第２斜め方向の前側を向いていることになる。
　図１４に示すように、前側連結部７４１の前面７４１ａと、前側突出片７４２の前面７４２ａとは、面一に配置されている。 As shown in FIGS. 14 and 15, the front member 74 includes a front connecting portion 741 located on the inner side in the first diagonal direction and a front side protruding from the front portion of the front connecting portion 741 toward the outer side in the first diagonal direction. And a projecting piece 742.
The front surface (referred to as the front surface 741a) of the front connecting portion 741 and the front surface (referred to as the front surface 742a) of the front protruding piece 742 are respectively formed on surfaces that are slightly inward in the width direction rather than the front side in the front-rear direction. Has been done. The front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742 are formed on a surface along the first diagonal direction. A direction orthogonal to the front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742, which is orthogonal to the first diagonal direction, is referred to as a second diagonal direction. In the second diagonal direction, the side slightly inward in the width direction relative to the front side in the front-rear direction is defined as the front side, and the opposite side to the side slightly outward in the width direction relative to the rear side in the front-rear direction is defined as the rear side. The front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742 face the front side in the second diagonal direction.
As shown in FIG. 14, the front surface 741a of the front connecting portion 741 and the front surface 742a of the front protruding piece 742 are arranged flush with each other.
　図１５に示すように、前側連結部７４１の後方を向く面（後面７４１ｂとする）には、第１斜め方向の中間部に第１段部７４１ｃが形成され、第１段部７４１ｃよりも第１斜め方向の外側となる外側部分７４１ｄが、第１段部７４１ｃよりも第１斜め方向の内側となる内側部分７４１ｅよりも前側に位置している。前側連結部７４１の後面７４１ｂにおける外側部分７４１ｄおよび内側部分７４１ｅは、共に第２斜め方向の後側を向く面に形成されている。
　前側突出片７４２の後方を向く面（後面７４２ｂとする）は、第２斜め方向の後側を向く面に形成されている。前側突出片７４２の後面７４２ｂは、前側連結部７４１の後面における外側部分７４１ｄよりも前側に位置している。前側突出片７４２の後面７４２ｂと前側連結部７４１の後面７４１ｂとの間には第２段部７４２ｃが形成されている。 As shown in FIG. 15, on the surface (referred to as the rear surface 741b) of the front connecting portion 741 facing rearward, a first step portion 741c is formed at an intermediate portion in the first oblique direction, and the first step portion 741c is formed at a position closer to the first step portion 741c. The outer portion 741d, which is the outer side in one diagonal direction, is located in front of the inner portion 741e, which is the inner side in the first diagonal direction, with respect to the first step portion 741c. The outer portion 741d and the inner portion 741e on the rear surface 741b of the front connecting portion 741 are both formed on a surface facing the rear side in the second diagonal direction.
A rear-facing surface (referred to as a rear surface 742b) of the front protruding piece 742 is formed on a surface facing the rear side in the second diagonal direction. The rear surface 742b of the front protruding piece 742 is located on the front side of the outer portion 741d on the rear surface of the front coupling portion 741. A second step portion 742c is formed between the rear surface 742b of the front protruding piece 742 and the rear surface 741b of the front connecting portion 741.
　図１３に示すように、前側連結部７４１の第１斜め方向の内側の側面（第１側面７４１ｆとする）は、第１斜め方向の内側を向く面に形成されている。
　図１３および図１６に示すように、前側連結部７４１には、第１斜め方向の内側の部分に第１斜め方向の内側に開口する凹部状の第４孔部７４３が形成されている。第４孔部７４３の周面には、ネジ山が形成されている。第４孔部７４３は、上下方向に間隔をあけて２か所設けられている。 As shown in FIG. 13, the inner side surface of the front connecting portion 741 in the first diagonal direction (referred to as the first side surface 741f) is formed on the surface facing the inner side in the first diagonal direction.
As shown in FIGS. 13 and 16, the front connecting portion 741 is provided with a concave fourth hole portion 743 that is open inward in the first diagonal direction at a portion inside the first diagonal direction. Threads are formed on the peripheral surface of the fourth hole 743. The fourth hole portions 743 are provided in two places at intervals in the vertical direction.
　図１４および図１６に示すように、後側部材７５は、平板状に形成されている。
　後側部材７５の前側を向く面（前面７５ａとする）は、第２斜め方向の前側を向く面に形成されている。後側部材７５の後側を向く面（後面７５ｂとする）は、第２斜め方向の後側を向く面に形成されている。
　後側部材７５は、前側部材７４の第１段部７４１ｃに第１斜め方向の内側の端部７５ｃが位置し、前側部材７４の前側連結部７４１よりも第１斜め方向の外側に突出するように配置される。 As shown in FIGS. 14 and 16, the rear member 75 has a flat plate shape.
The front surface of the rear member 75 (referred to as the front surface 75a) is formed on the front surface in the second diagonal direction. The rear-facing surface of the rear member 75 (referred to as the rear surface 75b) is formed on the rear-facing surface in the second diagonal direction.
The rear member 75 has an inner end 75c in the first diagonal direction located on the first step 741c of the front member 74, and projects rearward in the first diagonal direction more than the front connecting portion 741 of the front member 74. Is located in.
　後側部材７５は、前側連結部７４１の後側に配置されて前側連結部７４１と連結される後側連結部７５１と、後側連結部７５１の第１斜め方向の外側に配置され、前側連結部７４１よりも第１斜め方向の外側に突出する後側突出片７５２と、を有している。
　図１４に示すように、後側部材７５は、後側連結部７５１の第１斜め方向の内側の縁部が、前側部材７４の前側連結部７４１の第１段部７４１ｃに沿い、後側連結部７５１が第１段部７４１ｃの第１斜め方向の外側に配置された状態で前側部材７４と連結されている。後側連結部７５１が第１段部７４１ｃの第１斜め方向の外側に配置されることにより、前側部材７４と後側部材７５との位置決めが容易となる。 The rear member 75 is disposed on the rear side of the front coupling portion 741 and is coupled to the front coupling portion 741, and the rear coupling portion 751 and the rear coupling portion 751. The rear side protruding piece 752 that protrudes outward in the first diagonal direction from the portion 741 is included.
As shown in FIG. 14, in the rear member 75, the inner edge of the rear connecting portion 751 in the first oblique direction is along the first step portion 741c of the front connecting portion 741 of the front member 74, and the rear connecting portion The portion 751 is connected to the front member 74 in a state of being arranged outside the first step portion 741c in the first diagonal direction. By arranging the rear side connecting portion 751 on the outer side of the first step portion 741c in the first diagonal direction, the positioning of the front side member 74 and the rear side member 75 becomes easy.
　上記のように、前側部材７４と後側部材７５とが連結されると、前側突出片７４２と後側突出片７５２とは、第２斜め方向に間隔をあけて平行に配置されている。これにより、肘掛け本体支持部７２には、前側連結部７４１よりも第１斜め方向の外側に前側突出片７４２と後側突出片７５２とに挟まれた昇降溝部７４４が形成されている。 When the front member 74 and the rear member 75 are connected as described above, the front projecting piece 742 and the rear projecting piece 752 are arranged in parallel in the second diagonal direction with a space therebetween. As a result, the armrest main body support portion 72 is formed with an up-and-down groove portion 744 sandwiched between the front side protruding piece 742 and the rear side protruding piece 752 outside the front side connecting portion 741 in the first oblique direction.
　連結されている前側部材７４の前側連結部７４１と、後側部材７５の後側連結部７５１とを合わせて第１基部７２１とする。また、連結されている前側部材７４と後側部材７５とにおける昇降溝部７４４を形成している部分（前側突出片７４２、後側突出片７５２および前側連結部７４１の第１斜め方向の外側の端面）を合わせて昇降溝形成部７２３（第１係合部）とする。
　第１基部７２１の前面７２１ａは、前側連結部７４１の前面７４１ａを示し、第１基部７２１の後面７２１ｂは、前側連結部７４１の後面７４１ｂのうちの内側部分７４１ｅおよび後側連結部７５１の後面７５１ｂを示し、第１基部７２１の上面７２１ｃは、前側連結部７４１および後側連結部７５１の上面を示し、第１基部７２１の下面７２１ｄは、前側連結部７４１および後側連結部７５１の下面を示す。また、第１基部７２１の第１斜め方向の内側の第１側面７２１ｅは、前側連結部７４１の第１側面７４１ｆを示す。 The front-side connecting portion 741 of the front-side member 74 and the rear-side connecting portion 751 of the rear-side member 75, which are connected, are combined to form a first base portion 721. Further, the front-side member 74 and the rear-side member 75 that are connected to each other are the portions that form the elevating / lowering groove portion 744 (the end surfaces of the front-side protruding piece 742, the rear-side protruding piece 752, and the front-side connecting portion 741 in the first diagonal direction). ) Are combined to form the up-and-down groove forming portion 723 (first engaging portion).
The front surface 721a of the first base portion 721 indicates the front surface 741a of the front connecting portion 741, and the rear surface 721b of the first base portion 721 is the rear surface 751b of the inner portion 741e and the rear connecting portion 751 of the rear surface 741b of the front connecting portion 741. The upper surface 721c of the first base portion 721 shows the upper surfaces of the front connecting portion 741 and the rear connecting portion 751, and the lower surface 721d of the first base portion 721 shows the lower surfaces of the front connecting portion 741 and the rear connecting portion 751. . In addition, the first side surface 721e on the inner side in the first diagonal direction of the first base portion 721 indicates the first side surface 741f of the front connecting portion 741.
　図１５に示すように、前側突出片７４２の後面７４２ｂには、上下方向に延びる第１前側突出片溝部７４５と、上下方向に延びる第２前側突出片溝部７４６と、が形成されている。第１前側突出片溝部７４５および第２前側突出片溝部７４６は、第１前側突出片溝部７４５が第２前側突出片溝部７４６の第１斜め方向の外側に離間して配置されている。第１前側突出片溝部７４５および第２前側突出片溝部７４６は、それぞれ第２斜め方向の後側に開口している。 As shown in FIG. 15, the front surface 742b of the front protruding piece 742 is formed with a first front protruding piece groove portion 745 extending in the vertical direction and a second front protruding piece groove portion 746 extending in the vertical direction. The first front protruding piece groove portion 745 and the second front protruding piece groove portion 746 are arranged such that the first front protruding piece groove portion 745 is spaced apart from the second front protruding piece groove portion 746 in the first diagonal direction. The first front-side protruding piece groove portion 745 and the second front-side protruding piece groove portion 746 each open to the rear side in the second diagonal direction.
　第１前側突出片溝部７４５は、上下方向に間隔をあけて２か所形成されている。２つの第１前側突出片溝部７４５は、ほぼ同じ形状に形成されている。
　第１前側突出片溝部７４５は、上下方向に延びる丸溝部７４５ｃと、丸溝部７４５ｃの上端部に連続して設けられ溝幅が丸溝部７４５ｃの溝幅よりも大きい上溝部７４５ｄと、丸溝部７４５ｃの下端部に連続して設けられ溝幅が丸溝部７４５ｃの溝幅よりも大きい下溝部７４５ｅと、を有している。丸溝部７４５ｃの断面は、半円弧状に形成されている。 The first front-side protruding piece groove portion 745 is formed at two places with an interval in the vertical direction. The two first front protruding piece groove portions 745 are formed in substantially the same shape.
The first front protruding piece groove portion 745 includes a round groove portion 745c that extends in the vertical direction, an upper groove portion 745d that is provided continuously to the upper end portion of the round groove portion 745c, and has a groove width larger than the groove width of the round groove portion 745c, and the round groove portion 745c. And a lower groove portion 745e which is provided continuously to the lower end portion of which has a groove width larger than the groove width of the round groove portion 745c. The cross section of the round groove portion 745c is formed in a semicircular arc shape.
　上側の第１前側突出片溝部７４５の上溝部７４５ｄは、前側突出片７４２の上端部よりもやや下側に位置している。下側の第１前側突出片溝部７４５の下溝部７４５ｅは、下端部が前側突出片７４２の下端部よりも上側に位置している。上側の第１前側突出片溝部７４５の下溝部７４５ｅと、下側の第１前側突出片溝部７４５の上溝部７４５ｄとは、上下方向に離間している。
　上溝部７４５ｄの上端部に位置する下向きの端面を前側突出片溝部上側端面７４５ａとし、下溝部７４５ｅの下端部に位置する上向きの端面を前側突出片溝部下側端面７４５ｂとする。
　前側突出片７４２には、第１前側突出片溝部７４５と第２斜め方向に重なる位置に、第２斜め方向に貫通する孔部７４７が形成されている。孔部７４７は、前側突出片７４２における２つの第１前側突出片溝部７４５それぞれの丸溝部７４５ｃの上部側および下部側と重なる位置に形成されている。 The upper groove portion 745d of the upper first front protruding piece groove portion 745 is located slightly below the upper end portion of the front protruding piece 742. The lower end portion of the lower groove portion 745e of the lower first front protruding piece groove portion 745 is positioned above the lower end portion of the front protruding piece 742. The lower groove portion 745e of the upper first front protruding piece groove portion 745 and the upper groove portion 745d of the lower first front protruding piece groove portion 745 are separated from each other in the vertical direction.
The downward end surface located at the upper end portion of the upper groove portion 745d is defined as the front protruding piece groove portion upper end surface 745a, and the upward end surface located at the lower end portion of the lower groove portion 745e is defined as the front protruding piece groove portion lower end surface 745b.
The front protruding piece 742 is formed with a hole portion 747 penetrating in the second diagonal direction at a position overlapping the first front protruding piece groove portion 745 in the second diagonal direction. The hole portion 747 is formed at a position overlapping the upper side and the lower side of the round groove portions 745c of the two first front side protruding piece groove portions 745 of the front side protruding piece 742, respectively.
　第２前側突出片溝部７４６は、上下方向に延びる上下溝部７４６ａと、上下溝部７４６ａから第１斜め方向の内側に突出する複数の突出溝部７４６ｂと、を有している。
　上下溝部７４６ａは、前側突出片７４２の高さ方向のほぼ全体にわたって上下方向に延びている。上下溝部７４６ａは、上端部が前側突出片７４２の上端部よりもやや下側に位置し、下端部が前側突出片７４２の下端部よりもやや上側に位置している。
　突出溝部７４６ｂは、上下方向に等間隔をあけて複数形成されている。図１５に示す第２前側突出片溝部７４６には、１１の突出溝部７４６ｂが設けられている。複数の突出溝部７４６ｂは、それぞれ上下溝部７４６ａと連続していて、上下溝部７４６ａとほぼ同じ深さに形成されている。 The second front protruding piece groove portion 746 has a vertical groove portion 746a extending in the vertical direction and a plurality of protruding groove portions 746b protruding inward in the first diagonal direction from the vertical groove portion 746a.
The upper and lower groove portions 746a extend in the vertical direction over substantially the entire height of the front protruding piece 742. The upper and lower groove portions 746a have their upper ends located slightly below the upper ends of the front protruding pieces 742, and their lower ends located slightly above the lower ends of the front protruding pieces 742.
A plurality of protruding groove portions 746b are formed at equal intervals in the vertical direction. The second front protruding piece groove portion 746 shown in FIG. 15 is provided with eleven protruding groove portions 746b. The plurality of protruding groove portions 746b are continuous with the upper and lower groove portions 746a, respectively, and are formed at substantially the same depth as the upper and lower groove portions 746a.
　前側突出片７４２の第１斜め方向の外側の端面および後面には、第１滑り材７６１が張り付けられている。第１滑り材７６１は、第１前側突出片溝部７４５と干渉しない位置に張り付けられている。 A first sliding member 761 is attached to the outer end surface and the rear surface of the front protruding piece 742 in the first diagonal direction. The first sliding member 761 is attached to a position where it does not interfere with the first front protruding piece groove portion 745.
　図１７に示すように、後側突出片７５２の前面７５２ａには、上下方向に延びる第１後側突出片溝部７５５と、上下方向に延びる第２後側突出片溝部７５６と、が形成されている。第１後側突出片溝部７５５および第２後側突出片溝部７５６は、第１後側突出片溝部７５５が第２後側突出片溝部７５６の第１斜め方向の外側に離間して配置されている。第１後側突出片溝部７５５および第２後側突出片溝部７５６は、それぞれ第２斜め方向の前側に開口している。 As shown in FIG. 17, the front surface 752a of the rear projecting piece 752 is formed with a first rear projecting piece groove portion 755 extending vertically and a second rear projecting piece groove portion 756 extending vertically. There is. The first rear projecting piece groove portion 755 and the second rear projecting piece groove portion 756 are arranged such that the first rear projecting piece groove portion 755 is spaced apart from the second rear projecting piece groove portion 756 in the first diagonal direction. There is. Each of the first rear protruding piece groove portion 755 and the second rear protruding piece groove portion 756 is open to the front side in the second diagonal direction.
　第２後側突出片溝部７５６は、上下方向に間隔をあけて２か所形成されている。２つの第２後側突出片溝部７５６は、ほぼ同じ形状に形成されている。
　第２後側突出片溝部７５６は、上下方向に延びる丸溝部７５５ｃと、丸溝部７５５ｃの上端部に連続して設けられ溝幅が丸溝部７５５ｃの溝幅よりも大きい上溝部７５５ｄと、丸溝部７５５ｃの下端部に連続して設けられ溝幅が丸溝部７５５ｃの溝幅よりも大きい下溝部７５５ｅと、を有している。丸溝部７５５ｃの断面は、半円弧状に形成されている。 The second rear-side protruding piece groove portion 756 is formed at two places with a space in the vertical direction. The two second rear protruding piece groove portions 756 are formed to have substantially the same shape.
The second rear projecting piece groove portion 756 includes a round groove portion 755c extending in the up-down direction, an upper groove portion 755d which is provided continuously to the upper end portion of the round groove portion 755c and has a groove width larger than the groove width of the round groove portion 755c, and the round groove portion 755c. And a lower groove portion 755e which is continuously provided on the lower end portion of the 755c and has a groove width larger than the groove width of the round groove portion 755c. The cross section of the round groove portion 755c is formed in a semicircular arc shape.
　上側の第２後側突出片溝部７５６の上溝部７５５ｄは、後側突出片７５２の上端部よりもやや下側に位置している。下側の第２後側突出片溝部７５６の下溝部７５５ｅは、下端部が後側突出片７５２の下端部よりも上側に位置している。上側の第２後側突出片溝部７５６の下溝部７５５ｅと、下側の第２後側突出片溝部７５６の上溝部７５５ｄとは、上下方向に離間している。
　上溝部７５５ｄの上端部に位置する下向きの端面を後側突出片溝部上側端面７５５ａとし、下溝部７５５ｅの下端部に位置する上向きの端面を後側突出片溝部下側端面７５５ｂとする。
　後側突出片７５２には、第２後側突出片溝部７５６と第２斜め方向に重なる位置に、第２斜め方向に貫通する孔部７５７が形成されている。孔部７５７は、後側突出片７５２における２つの第２後側突出片溝部７５６それぞれの丸溝部７５５ｃの上部側および下部側と重なる位置に形成されている。 The upper groove portion 755d of the upper second rear protruding piece groove portion 756 is located slightly below the upper end portion of the rear protruding piece 752. The lower end portion of the lower groove portion 755e of the second rear protruding piece groove portion 756 on the lower side is located above the lower end portion of the rear protruding piece 752. The lower groove portion 755e of the upper second rear protruding piece groove portion 756 and the upper groove portion 755d of the lower second rear protruding piece groove portion 756 are vertically separated from each other.
The downward end surface located at the upper end portion of the upper groove portion 755d is referred to as a rear protruding piece groove portion upper end surface 755a, and the upward end surface located at the lower end portion of the lower groove portion 755e is referred to as a rear protruding piece groove portion lower end surface 755b.
The rear projecting piece 752 has a hole 757 penetrating in the second diagonal direction at a position overlapping the second rear projecting piece groove 756 in the second diagonal direction. The hole portion 757 is formed at a position overlapping the upper side and the lower side of the round groove portion 755c of each of the two second rear side protruding piece groove portions 756 in the rear side protruding piece 752.
　第２後側突出片溝部７５６は、上下方向に延びる上下溝部７５６ａと、上下溝部７５６ａから第１斜め方向の外側に突出する複数の突出溝部７５６ｂと、を有している。
　上下溝部７５６ａは、後側突出片７５２の高さ方向のほぼ全体にわたって上下方向に延びている。上下溝部７５６ａは、上端部が後側突出片７５２の上端部よりもやや下側に位置し、下端部が後側突出片７５２の下端部よりもやや上側に位置している。
　突出溝部７５６ｂは、上下方向に等間隔をあけて複数形成されている。図１７に示す第２後側突出片溝部７５６には、１１の突出溝部７５６ｂが設けられている。複数の突出溝部７５６ｂは、それぞれ上下溝部７５６ａと連続していて、上下溝部７５６ａとほぼ同じ深さに形成されている。 The second rear protruding piece groove portion 756 has an up-down groove portion 756a extending in the up-down direction and a plurality of protruding groove portions 756b protruding from the up-down groove portion 756a to the outside in the first diagonal direction.
The upper and lower groove portions 756a extend in the vertical direction over substantially the entire height of the rear protruding piece 752. The upper and lower groove portions 756a have their upper ends located slightly below the upper ends of the rear protruding pieces 752, and their lower ends located slightly above the lower ends of the rear protruding pieces 752.
The plurality of protruding groove portions 756b are formed at equal intervals in the vertical direction. The second rear protruding piece groove portion 756 shown in FIG. 17 is provided with eleven protruding groove portions 756b. The plurality of protruding groove portions 756b are continuous with the upper and lower groove portions 756a, respectively, and are formed at substantially the same depth as the upper and lower groove portions 756a.
　後側突出片７５２の第１斜め方向の外側の端面および前面には、第２滑り材７６２が張り付けられている。第２滑り材７６２は、第１後側突出片溝部７５５と干渉しない位置に張り付けられている。 A second sliding member 762 is attached to the outer end surface and the front surface of the rear protruding piece 752 in the first diagonal direction. The second sliding member 762 is attached to a position where it does not interfere with the first rear protruding piece groove portion 755.
（肘掛け本体）
　図１８に示すように、肘掛け本体７１は、上側に設けられて前後方向に延びる上部杆７１１と、後側に設けられて上部杆７１１の後端部から下側に向かって漸次後側に向かう斜め方向に延びる後部杆７１２と、上部杆７１１の前側部分の上部に取り付けられた肘乗せ部７１３と、を有している。肘掛け本体７１は、上部杆７１１および後部杆７１２を覆う肘掛け本体カバー部７１４（カバー部）を有している。 (Armrest body)
As shown in FIG. 18, the armrest main body 71 is provided on the upper side and extends in the front-rear direction, and the armrest main body 71 is provided on the rear side and gradually extends from the rear end portion of the upper rod 711 to the lower side. It has a rear rod 712 extending in an oblique direction and an elbow rest 713 attached to the upper portion of the front portion of the upper rod 711. The armrest main body 71 has an armrest main body cover portion 714 (cover portion) that covers the upper rod 711 and the rear rod 712.
　肘掛け本体７１は、肘掛け本体支持部７２（図１３参照）の幅方向の外側に配置され、後部杆７１２が幅方向の外側から肘掛け本体支持部７２に取り付けられている。後部杆７１２は、肘掛け本体支持部７２よりも上下方向に長く形成されている。
　肘掛け本体カバー部７１４は、上部杆７１１の幅方向の両側および下側、後部杆７１２の幅方向の外側、前側、後側および下側を覆う本体部７８１と、上部杆７１１および後部杆７１２の幅方向の内側を覆う内板部７８２と、上部杆７１１および後部杆７１２の上側を覆う上板部７８３と、を有している。
　本体部７８１は、上方に開口している。本体部７８１には、幅方向の内側および上側に開口し、内板部７８２が上側からはめ込まれる開口部７８１ａが形成されている。 The armrest main body 71 is disposed outside the armrest main body supporting portion 72 (see FIG. 13) in the width direction, and the rear rod 712 is attached to the armrest main body supporting portion 72 from the outside in the width direction. The rear rod 712 is formed longer than the armrest main body supporting portion 72 in the up-down direction.
The armrest main body cover portion 714 includes a main body portion 781 that covers both sides and a lower side in the width direction of the upper rod 711, an outer side in the width direction of the rear rod 712, a front side, a rear side and a lower side, and an upper rod 711 and a rear rod 712. It has an inner plate portion 782 that covers the inside in the width direction, and an upper plate portion 783 that covers the upper sides of the upper rod 711 and the rear rod 712.
The main body portion 781 is open upward. The main body portion 781 is formed with an opening portion 781a which is opened inward and upward in the width direction and into which the inner plate portion 782 is fitted from above.
　内板部７８２は、平板状に形成され、その板面が幅方向を向く姿勢で本体部７８１の開口部７８１ａに上側から嵌め込まれている。内板部７８２は、上下２つに分割されている。分割された内板部７８２のうちの下側を下側内板部７８４とし、上側を上側内板部７８５とする。下側内板部７８４および上側内板部７８５は、下側内板部７８４が本体部７８１の開口部７８１ａに上側から嵌め込まれた後に、上側内板部７８５が本体部７８１の開口部７８１ａに上側から嵌め込まれ、上下方向に配列された状態となる。下側内板部７８４と上側内板部７８５とは、当接して開口部７８１ａに配置されるとともに、下側内板部７８４の下端部が本体部７８１の開口部７８１ａの下端部と当接し、下側内板部７８４の上端部が本体部７８１の開口部７８１ａの上端部（本体部７８１の上端部）と同じ高さに配置されている。 The inner plate portion 782 is formed in a flat plate shape, and is fitted into the opening 781a of the main body portion 781 from above with the plate surface facing the width direction. The inner plate portion 782 is divided into upper and lower parts. The lower side of the divided inner plate portions 782 is the lower inner plate portion 784, and the upper side is the upper inner plate portion 785. The lower inner plate portion 784 and the upper inner plate portion 785 are arranged such that, after the lower inner plate portion 784 is fitted into the opening portion 781a of the main body portion 781 from above, the upper inner plate portion 785 is inserted into the opening portion 781a of the main body portion 781. It is fitted from the upper side and is in a state of being arranged vertically. The lower inner plate portion 784 and the upper inner plate portion 785 are placed in contact with each other and arranged in the opening 781a, and the lower end of the lower inner plate 784 abuts the lower end of the opening 781a of the main body 781. The upper end of the lower inner plate portion 784 is arranged at the same height as the upper end of the opening 781a of the main body 781 (the upper end of the main body 781).
　下側内板部７８４には、幅方向に貫通し上下方向に延びる下側溝部７８４ａが前後方向に間隔をあけて２つ形成されている。２つの下側溝部７８４ａは、それぞれ上端部が下側内板部７８４の上端に達し、上方に開口している。下側溝部７８４ａの下端部は、下板内板部の下端部よりも上側に配置されている。このため、下側溝部７８４ａは、下側には開口していない。
　下側内板部７８４の上部側における２つの下側溝部７８４ａの間には、幅方向に貫通し上側に開口する下側切り欠き部７８４ｂが形成されている。下側切り欠き部７８４ｂは、２つの下側溝部７８４ａと連通している。 The lower inner plate portion 784 is formed with two lower groove portions 784a that penetrate in the width direction and extend in the up and down direction and are spaced apart in the front-rear direction. The upper ends of the two lower groove portions 784a reach the upper ends of the lower inner plate portions 784 and are open upward. The lower end of the lower groove portion 784a is arranged above the lower end of the lower plate inner plate portion. Therefore, the lower groove portion 784a does not open downward.
A lower cutout portion 784b penetrating in the width direction and opening to the upper side is formed between the two lower groove portions 784a on the upper side of the lower inner plate portion 784. The lower cutout portion 784b communicates with the two lower groove portions 784a.
　上側内板部７８５には、幅方向に貫通し上下方向に延びる上側溝部７８５ａが前後方向に間隔をあけて２つ形成されている。２つの上側溝部７８５ａは、それぞれ下端部が上側内板部７８５の上端に達し、下方に開口している。上側溝部７８５ａの上端部は、上板内板部の上端部よりも下側に配置されている。このため、上側溝部７８５ａは、上側には開口していない。
　上側内板部７８５の下部側における２つの上側溝部７８５ａの間には、幅方向に貫通し下側に開口する上側切り欠き部７８５ｂが形成されている。上側切り欠き部７８５ｂは、２つの上側溝部７８５ａと連通している。 The upper inner plate portion 785 is formed with two upper groove portions 785a that penetrate in the width direction and extend in the up-down direction and are spaced from each other in the front-rear direction. The lower ends of the two upper groove portions 785a reach the upper ends of the upper inner plate portions 785 and are open downward. The upper end of the upper groove 785a is arranged below the upper end of the upper plate inner plate. Therefore, the upper groove portion 785a does not open to the upper side.
Between the two upper groove portions 785a on the lower side of the upper inner plate portion 785, an upper cutout portion 785b penetrating in the width direction and opening to the lower side is formed. The upper cutout portion 785b communicates with the two upper groove portions 785a.
　下側内板部７８４の上側に上側内板部７８５が配置されると、下側溝部７８４ａの上側に上側溝部７８５ａが連続して配置され、下側切り欠き部７８４ｂの上側に上側切り欠き部７８５ｂが連続して配置される。これにより、内板部７８２には、２つの上側溝部７８５ａと２つの下側溝部７８４ａとが連続した２つの肘掛け本体カバー溝部７１４ａ，７１４ｂが前後方向に間隔をあけて形成されている。また、内板部７８２には、下側切り欠き部７８４ｂと上側切り欠き部７８５ｂとが連続した肘掛け本体カバー切り欠き部７１４ｃが上下方向の中間部に形成されている。 When the upper inner plate portion 785 is arranged on the upper side of the lower inner plate portion 784, the upper groove portion 785a is continuously arranged on the upper side of the lower groove portion 784a, and the upper cutout portion is formed on the upper side of the lower cutout portion 784b. The parts 785b are continuously arranged. As a result, two armrest main body cover groove portions 714a and 714b in which the two upper groove portions 785a and the two lower groove portions 784a are continuous are formed in the inner plate portion 782 at intervals in the front-rear direction. Further, the inner plate portion 782 is provided with an armrest main body cover cutout portion 714c in which a lower cutout portion 784b and an upper cutout portion 785b are continuous with each other at an intermediate portion in the vertical direction.
　２つの肘掛け本体カバー溝部７１４ａ，７１４ｂは、肘掛け本体支持部７２の前側突出片７４２および後側突出片７５２が挿通されるように構成されている。
　２つの肘掛け本体カバー溝部７１４ａ，７１４ｂのうち、前側の肘掛け本体カバー溝部を前側肘掛け本体カバー溝部７１４ａとし、後側の肘掛け本体カバー溝部を後側肘掛け本体カバー溝部７１４ｂとする。
　前側肘掛け本体カバー溝部７１４ａは、前側部材７４の前側突出片７４２が貫通し、後側肘掛け本体カバー溝部７１４ｂは、後側部材７５の後側突出片７５２が貫通する。前側肘掛け本体カバー溝部７１４ａを貫通した前側突出片７４２は、後部杆７１２の内部に配置される。後側肘掛け本体カバー溝部７１４ｂを貫通した後側突出片７５２は、後部杆７１２の内部に配置される。 The two armrest main body cover groove portions 714a and 714b are configured so that the front side protruding piece 742 and the rear side protruding piece 752 of the armrest main body supporting portion 72 are inserted.
Of the two armrest body cover groove portions 714a and 714b, the front armrest body cover groove portion is the front armrest body cover groove portion 714a, and the rear armrest body cover groove portion is the rear armrest body cover groove portion 714b.
The front protruding piece 742 of the front member 74 penetrates the front armrest main body cover groove portion 714a, and the rear protruding piece 752 of the rear member 75 penetrates the rear armrest main body cover groove portion 714b. The front protruding piece 742 that has penetrated the front armrest main body cover groove portion 714 a is arranged inside the rear rod 712. The rear protruding piece 752 penetrating the rear armrest main body cover groove portion 714 b is arranged inside the rear rod 712.
　上板部７８３は、本体部７８１および内板部７８２の上部に取り付けられている。上板部７８３は、上部杆７１１における後側部分の上部に取り付けられていて、肘乗せ部７１３の後側に位置している。 The upper plate part 783 is attached to the upper part of the main body part 781 and the inner plate part 782. The upper plate portion 783 is attached to the upper portion of the rear side portion of the upper rod 711, and is located on the rear side of the armrest portion 713.
　図１９に示すように、上部杆７１１は、肘掛け本体カバー部７１４の内部に設けられて、構造部材となる板金部材７１６を有している。板金部材７１６は、前後方向に延びる形状に形成されている。
　板金部材７１６の前側部材の上部には、肘乗せ部７１３が取り付けられている。本実施形態では、肘乗せ部７１３は、板金部材７１６に前後方向および幅方向に移動可能に支持されている。
　板金部材７１６の後側部材の上部には、上板部７８３が配置される。 As shown in FIG. 19, the upper rod 711 has a sheet metal member 716 which is provided inside the armrest main body cover portion 714 and serves as a structural member. The sheet metal member 716 is formed in a shape extending in the front-rear direction.
An elbow rest 713 is attached to the upper part of the front member of the sheet metal member 716. In the present embodiment, the armrest 713 is supported by the sheet metal member 716 so as to be movable in the front-rear direction and the width direction.
An upper plate portion 783 is arranged above the rear member of the sheet metal member 716.
　後部杆７１２は、肘掛け本体支持部７２と上下方向に相対移動可能に係合するレール部材７７（第２係合部）と、レール部材７７を肘掛け本体支持部７２に対して複数の高さ位置に拘束可能な高さ位置拘束手段７９と、を有している。 The rear rod 712 includes a rail member 77 (second engaging portion) that engages with the armrest main body support portion 72 so as to be relatively movable in the vertical direction, and the rail member 77 at a plurality of height positions with respect to the armrest main body support portion 72. And a height position restraining means 79 capable of restraining.
　レール部材７７は、上下方向に延びる長尺の部材で構成されている。レール部材７７は、上下方向の寸法が後部杆７１２の上下方向の寸法よりもやや小さくなるように形成され、肘掛け本体カバー部７１４の内部に収容されている。レール部材７７の上下方向の寸法は、肘掛け本体支持部７２の上下方向の寸法よりも長く設定されている。レール部材７７は、上端部分が上部杆７１１の板金部材７１６の後端部分に固定されている。本実施形態では、レール部材７７は金属で形成されていて、後述する第２基部７７１の上端部分が板金部材７１６に溶接されている。 The rail member 77 is composed of a long member that extends in the vertical direction. The rail member 77 is formed such that its vertical dimension is slightly smaller than the vertical dimension of the rear rod 712, and is housed inside the armrest main body cover section 714. The vertical dimension of the rail member 77 is set to be longer than the vertical dimension of the armrest main body support portion 72. An upper end portion of the rail member 77 is fixed to a rear end portion of the sheet metal member 716 of the upper rod 711. In this embodiment, the rail member 77 is made of metal, and the upper end portion of the second base portion 771 described later is welded to the sheet metal member 716.
　図２０および図２１に示すように、レール部材７７は、上下方向に延びる棒状の第２基部７７１と、第２基部７７１の上端部から第１斜め方向の内側に突出する上側突出片７７３（下側規制部）と、第２基部７７１の下端部から第１斜め方向の内側に突出する下側突出片７７４（上側規制部）と、第２基部７７１における上側突出片７７３と下側突出片７７４との間の全体から第１斜め方向の内側に突出する凸条部７７２と、を有している。凸条部７７２は、肘掛け本体支持部７２の昇降溝部７４４に挿入される。 As shown in FIGS. 20 and 21, the rail member 77 includes a rod-shaped second base portion 771 extending in the vertical direction and an upper protruding piece 773 (lower bottom portion) protruding from the upper end portion of the second base portion 771 inward in the first diagonal direction. Side regulating portion), a lower protruding piece 774 (upper regulating portion) protruding inward in the first diagonal direction from the lower end portion of the second base portion 771, and an upper protruding piece 773 and a lower protruding portion 774 of the second base portion 771. And a ridge portion 772 that protrudes inward in the first diagonal direction from the whole between. The protruding portion 772 is inserted into the elevating groove portion 744 of the armrest main body supporting portion 72.
　第２基部７７１の外周面のうちの幅方向の内側の部分（内側面７７１ａとする）は、第２斜め方向に沿った面で、第１斜め方向の内側を向く面となっている。
　上側突出片７７３は、第２基部７７１の内側面７７１ａの第２斜め方向の中間部分を除いた前側部分および後側部分それぞれから第１斜め方向の内側に突出している。前側の上側突出片７７３と後側の上側突出片７７３との間には、隙間７７３ｂが形成されている。第２基部７７１の上部には、前側の上側突出片７７３と後側の上側突出片７７３との隙間７７３ｂの第１斜め方向の外側に連続する第２基部上側切り欠き部７７１ｂが形成されている。 A portion of the outer peripheral surface of the second base portion 771 on the inner side in the width direction (referred to as the inner side surface 771a) is a surface along the second diagonal direction and faces the inner side in the first diagonal direction.
The upper projecting piece 773 projects inward in the first diagonal direction from each of the front portion and the rear portion of the inner surface 771a of the second base portion 771 excluding the intermediate portion in the second diagonal direction. A gap 773b is formed between the front side upper protruding piece 773 and the rear side upper protruding piece 773. In the upper part of the second base portion 771, a second base upper cutout portion 771b continuous to the outer side in the first diagonal direction of the gap 773b between the front side upper protrusion piece 773 and the rear side upper protrusion piece 773 is formed. .
　下側突出片７７４は、第２基部７７１の内側面７７１ａの第２斜め方向の全体から第１斜め方向の内側に突出している。
　上側突出片７７３および下側突出片７７４は、それぞれ第２斜め方向の前側から後側に向かって漸次突出長さが長くなっていて、先端面７７３ａ，７７４ａが前後方向に沿った幅方向の内側を向く面となっている。 The lower protruding piece 774 projects inward in the first diagonal direction from the entire inner surface 771a of the second base portion 771 in the second diagonal direction.
The upper projecting piece 773 and the lower projecting piece 774 each have a projecting length that gradually increases from the front side to the rear side in the second diagonal direction, and the front end surfaces 773a and 774a are inside in the width direction along the front-rear direction. It is the surface facing.
　凸条部７７２は、第２基部７７１の内側面７７１ａの第２斜め方向の中間部分から第１斜め方向の内側に突出している。凸条部７７２は、第２斜め方向の前側から後側に向かって漸次突出長さが長くなっていて、先端面７７２ｅが前後方向に沿った幅方向の内側を向く面となっている。凸条部７７２の先端面７７２ｅは、上側突出片７７３および下側突出片７７４の先端面７７３ａ，７７４ａと面一となっている。
　凸条部７７２の外周面のうちの前方を向く面（前面７７２ａとする）は、第２斜め方向の前側を向く面に形成されている。凸条部７７２の外周面のうちの後方を向く面（後面７７２ｂとする）は、第２斜め方向の前側を向く面に形成されている。凸条部７７２の前面７７２ａと後面７７２ｂとは平行になっている。 The ridge portion 772 projects inward in the first diagonal direction from an intermediate portion of the inner side surface 771a of the second base portion 771 in the second diagonal direction. The protruding portion 772 has a projecting length that gradually increases from the front side to the rear side in the second diagonal direction, and the front end surface 772e is a surface that faces the inner side in the width direction along the front-rear direction. The front end surface 772e of the protruding portion 772 is flush with the front end surfaces 773a and 774a of the upper projecting piece 773 and the lower projecting piece 774.
A front surface (referred to as a front surface 772a) of the outer peripheral surface of the ridge portion 772 is formed on a front surface in the second diagonal direction. A rear-facing surface (referred to as a rear surface 772b) of the outer peripheral surface of the ridge portion 772 is formed as a surface facing the front side in the second diagonal direction. The front surface 772a and the rear surface 772b of the ridge portion 772 are parallel to each other.
　図２０－図２２に示すように、凸条部７７２の前面７７２ａには、上下方向の略全体にわたって延びる凸条部前側溝部７７２ｃが形成されている。凸条部前側溝部７７２ｃの断面は、円弧状に形成されている。
　凸条部７７２の後面７７２ｂには、上下方向の略全体にわたって延びる凸条部後側溝部７７２ｄが形成されている。凸条部後側溝部７７２ｄの断面は、円弧状に形成されている。 As shown in FIGS. 20 to 22, the front surface 772a of the ridge 772 is formed with a ridge front groove 772c extending over substantially the entire vertical direction. The cross section of the ridge front groove portion 772c is formed in an arc shape.
The rear surface 772b of the ridge portion 772 is formed with a ridge portion rear side groove portion 772d extending substantially over the entire vertical direction. The cross section of the convex groove rear side groove portion 772d is formed in an arc shape.
　凸条部７７２には、上側部分に、上下方向に延びて、第１斜め方向の内側（凸条部７７２が突出する側）に開口する凸条部先端側溝部７７５が形成されている。凸条部先端側溝部７７５は、凸条部７７２の上端部まで達し、前側の上側突出片７７３と後側の上側突出片７７３との隙間７７３ｂを介して上方に開口している。
　凸条部先端側溝部７７５は、高さ位置拘束手段７９（高さ位置固定部）が配置されるように構成されている。 The ridge portion 772 is formed with a ridge tip end side groove portion 775 that extends in the up-down direction and opens inward in the first diagonal direction (the side where the ridge portion 772 projects) in the upper portion. The ridge portion front end side groove portion 775 reaches the upper end portion of the ridge portion 772 and is opened upward through a gap 773b between the front side upper protruding piece 773 and the rear side upper protruding piece 773.
The ridge portion front end side groove portion 775 is configured such that the height position restraining means 79 (height position fixing portion) is arranged.
　凸条部７７２における凸条部先端側溝部７７５の第２斜め方向の両側の部分を溝部形成片７７６ａ，７７６ｂとする。２つの溝部形成片７７６ａ，７７６ｂは、それぞれ下部側に上部側よりも第１斜め方向の内側に突出する溝部形成片突出部７７７を有している。溝部形成片突出部７７７には、第１斜め方向の内側（凸条部７７２が突出する側）に開口する溝部形成片切り欠き部７７７ａが形成されている。溝部形成片７７６における溝部形成片突出部７７７が形成されている部分よりも上側の部分を溝部形成片上側部分７７８とする。
　また、凸条部７７２における凸条部先端側溝部７７５が形成されている部分よりも下側の部分を凸条部下側部分７７９とする。溝部形成片突出部７７７は、凸条部下側部分７７９よりも第１斜め方向の内側に突出している。溝部形成片突出部７７７の下端部と凸条部下側部分７７９の上端部は上下方向に離間している。凸条部下側部分７７９の上端面７７９ａは、凸条部先端側溝部７７５が延びる方向（上下方向）を向く平坦面に形成されている。 The portions of the ridge portion 772 on both sides in the second oblique direction of the groove portion 775 on the tip side of the ridge portion are referred to as groove forming pieces 776a and 776b. Each of the two groove forming pieces 776a and 776b has a groove forming piece protruding portion 777 on the lower side that protrudes inward in the first diagonal direction from the upper side. The groove forming piece projecting portion 777 is formed with a groove forming piece cutout portion 777a that is opened inward in the first diagonal direction (the side on which the protruding portion 772 projects). A portion of the groove forming piece 776 above the groove forming piece protruding portion 777 is defined as a groove forming piece upper portion 778.
Further, a portion of the ridge portion 772 below the portion in which the ridge portion front end side groove portion 775 is formed is referred to as a ridge portion lower portion 779. The groove forming piece protruding portion 777 protrudes inward in the first oblique direction with respect to the ridge lower portion 779. The lower end of the groove forming piece projecting portion 777 and the upper end of the ridge lower portion 779 are vertically separated from each other. The upper end surface 779a of the lower portion 779 of the protruding portion is formed as a flat surface that faces the direction (vertical direction) in which the groove portion 775 on the leading end side of the protruding portion extends.
　高さ位置拘束手段７９は、上部杆７１１に設けられた操作レバー７１５（図１９参照）と接続され、操作レバー７１５の操作によって、レール部材７７が肘掛け本体支持部７２に係止された状態と、係止が解除された状態とに切り替えるように構成されている。
　高さ位置拘束手段７９は、操作レバー７１５と接続され操作レバー７１５の操作によって上下方向に移動する移動部７９１と、移動部７９１の移動によって肘掛け本体支持部７２に係止された状態と係止が解除された状態とが切り替わるピン７９３と、移動部７９１を上側に付勢するばね７９４と、を有している。 The height position restraining means 79 is connected to an operating lever 715 (see FIG. 19) provided on the upper rod 711, and the rail member 77 is locked to the armrest main body supporting portion 72 by operating the operating lever 715. , Is configured to switch to the unlocked state.
The height position restraining means 79 is connected to the operating lever 715 and moves in the vertical direction by the operation of the operating lever 715, and a state in which the moving position 791 is locked to the armrest main body supporting portion 72 and locked. It has a pin 793 that switches between a released state and a spring 794 that biases the moving portion 791 upward.
　移動部７９１は、上下方向に延びる棒状の棒状部７９５と、棒状部７９５の上端部に接続され棒状部７９５よりも第１斜め方向の外側に突出する操作レバー接続部７９６と、棒状部７９５の下端部に接続され棒状部７９５よりも第１斜め方向の内側に突出するピン支持部７９７とピン支持部７９７の第１斜め方向の内側から下側に延びるガイド片７９８と、を有している。 The moving portion 791 includes a rod-shaped rod-shaped portion 795 that extends in the vertical direction, an operation lever connection portion 796 that is connected to an upper end portion of the rod-shaped portion 795 and projects outward in the first oblique direction from the rod-shaped portion 795, and a rod-shaped portion 795. It has a pin support portion 797 connected to the lower end portion and protruding inward in the first diagonal direction from the rod-shaped portion 795, and a guide piece 798 extending downward from the inside in the first diagonal direction of the pin support portion 797. .
　ピン支持部７９７には、第２斜め方向に貫通する長孔部７９７ａが形成されている。長孔部７９７ａは、第２斜め方向（長孔部７９７ａが貫通する方向）から見て、第１斜め方向の外側から内側に向かって漸次上側に向かう斜め方向に延びている。 A long hole portion 797a that penetrates in the second diagonal direction is formed in the pin support portion 797. The elongated hole portion 797a extends in an oblique direction from the outer side to the inner side in the first oblique direction gradually toward the upper side when viewed from the second oblique direction (direction in which the elongated hole part 797a penetrates).
　移動部７９１は、棒状部７９５およびピン支持部７９７がレール部材７７の凸条部先端側溝部７７５に配置され、操作レバー接続部７９６が前側の上側突出片７７３と後側の上側突出片７７３との隙間および第２基部上側切り欠き部７７１ｂに配置され、ガイド片７９８が凸条部下側部分７７９の第１斜め方向の内側に配置された状態に設置される。
　移動部７９１が上記のように設置されると、ピン支持部７９７は、凸条部下側部分７７９の上側に配置されている。ピン支持部７９７と凸条部下側部分７７９との間にばね７９４が設けられている。ばね７９４は、ピン支持部７９７を上方に付勢していて、これにより、移動部７９１が上方に付勢されるように構成されている。 In the moving portion 791, the rod-shaped portion 795 and the pin support portion 797 are arranged in the convex strip front end side groove portion 775 of the rail member 77, and the operation lever connection portion 796 includes the front side upper protruding piece 773 and the rear side upper protruding piece 773. And the second base upper cutout portion 771b, and the guide piece 798 is installed inside the convex lower portion 779 in the first diagonal direction.
When the moving portion 791 is installed as described above, the pin support portion 797 is arranged above the ridge lower portion 779. A spring 794 is provided between the pin support portion 797 and the ridge lower portion 779. The spring 794 is configured to bias the pin support portion 797 upward so that the moving portion 791 is biased upward.
　また、移動部７９１が上記のように設置されると、ピン支持部７９７の長孔部７９７ａは、２つの溝部形成片突出部７７７の溝部形成片切り欠き部７７７ａと第２斜め方向に重なった位置に配置されている。
　長孔部７９７ａの上下方向の寸法は、溝部形成片切り欠き部７７７ａの上下方向の寸法よりも大きく設定されている。長孔部７９７ａの第１斜め方向の寸法は、溝部形成片切り欠き部７７７ａの第１斜め方向の寸法とほぼ同じに設定されている。
　ピン支持部７９７の長孔部７９７ａおよび２つの溝部形成片突出部７７７の溝部形成片切り欠き部７７７ａには、ピン７９３が挿入されている。ピン７９３は、円柱状に形成され、第２斜め方向に延びる向きで長孔部７９７ａに挿入されている。
　ガイド片７９８は、凸条部下側部分７７９の第１斜め方向の内側の面（凸条部７７２の先端面７７２ｅ）と当接している。 Further, when the moving portion 791 is installed as described above, the long hole portion 797a of the pin support portion 797 overlaps the groove forming piece cutout portion 777a of the two groove forming piece projecting portions 777 in the second diagonal direction. It is located in a position.
The vertical dimension of the long hole portion 797a is set to be larger than the vertical dimension of the groove forming piece cutout portion 777a. The dimension of the long hole portion 797a in the first diagonal direction is set to be substantially the same as the dimension of the groove forming piece cutout portion 777a in the first diagonal direction.
The pin 793 is inserted into the long hole portion 797a of the pin support portion 797 and the groove forming piece cutout portion 777a of the two groove forming piece protruding portions 777. The pin 793 is formed in a cylindrical shape and is inserted into the long hole portion 797a in a direction extending in the second diagonal direction.
The guide piece 798 is in contact with the inner surface of the lower portion 779 of the ridge portion in the first diagonal direction (the tip surface 772e of the ridge portion 772).
　図１８に示すように、操作レバー７１５は、肘掛け本体カバー部７１４を前後方向に貫通して設けられている。図１９に示すように、操作レバー７１５は、肘掛け本体カバー部７１４（図１８参照）の内部に配置され移動部７９１の操作レバー接続部７９６の上側に位置する押圧部７１５ｂと、肘掛け本体カバー部７１４の外部に配置され、着座者が操作可能な操作部７１５ａと、を有している。
　操作レバー７１５は、押圧部７１５ｂが操作部７１５ａの後側に設けられていて、幅方向に延びる回動軸部７１５ｃの軸線まわりに回動可能に構成されている。回動軸部７１５ｃは、上部杆７１１の板金部材７１６に配置されている。すなわち、操作レバー７１５は、板金部材７１６に対して回動可能に構成されている。
　操作部７１５ａは、肘掛け本体カバー部７１４の下側に位置していて、着座者が下側から上側に押して操作可能に構成されている。操作レバー７１５は、操作部７１５ａが下側から押されると、回動軸部７１５ｃの軸線回りに回動し、押圧部７１５ｂが下側に移動し、移動部７９１を下側に押圧する。 As shown in FIG. 18, the operation lever 715 is provided so as to penetrate the armrest main body cover portion 714 in the front-rear direction. As shown in FIG. 19, the operating lever 715 is disposed inside the armrest main body cover portion 714 (see FIG. 18) and is located above the operating lever connecting portion 796 of the moving portion 791, and the armrest main body cover portion. 714, which is disposed outside the 714 and is operable by a seated person.
The operation lever 715 has a pressing portion 715b provided on the rear side of the operation portion 715a, and is configured to be rotatable around the axis of a rotation shaft portion 715c extending in the width direction. The rotating shaft portion 715c is arranged on the sheet metal member 716 of the upper rod 711. That is, the operation lever 715 is configured to be rotatable with respect to the sheet metal member 716.
The operation portion 715a is located below the armrest main body cover portion 714, and is configured to be operated by a seated person by pushing it from the lower side to the upper side. When the operating portion 715a is pushed from below, the operating lever 715 rotates around the axis of the rotating shaft portion 715c, the pressing portion 715b moves downward, and pushes the moving portion 791 downward.
　移動部７９１は、操作レバー７１５の操作によって下側に押圧されると、ばね７９４を圧縮して下側に移動し、操作レバーの操作によって下方向の押圧が解除されるとばね７９４の復元力によって上側に戻るように構成されている。移動部７９１に下方向の負荷が作用している状態を操作状態とし、下方向の負荷が作用していない状態を通常状態とする。
　図２３に示すように、移動部７９１は、通常状態では、長孔部７９７ａの下端部分７９７ｂが溝部形成片切り欠き部７７７ａと第２斜め方向に重なる。
　図２４に示すように、移動部７９１は、操作状態では、長孔部７９７ａの上端部分７９７ｃが溝部形成片切り欠き部７７７ａと第２斜め方向に重なる。 The moving portion 791 compresses the spring 794 and moves downward when pressed downward by the operation of the operation lever 715, and restores the restoring force of the spring 794 when the downward pressing is released by operation of the operation lever. Is configured to return to the upper side. A state in which a downward load is applied to the moving portion 791 is an operating state, and a state in which a downward load is not applied is a normal state.
As shown in FIG. 23, in the moving portion 791, in the normal state, the lower end portion 797b of the long hole portion 797a overlaps the groove forming piece cutout portion 777a in the second diagonal direction.
As shown in FIG. 24, in the moving portion 791, the upper end portion 797c of the long hole portion 797a overlaps the groove forming piece cutout portion 777a in the second diagonal direction in the operating state.
　このため、ピン７９３は、通常状態では溝部形成片切り欠き部７７７ａおよび長孔部７９７ａの下端部分７９７ｂを貫通し、操作状態では溝部形成片切り欠き部７７７ａおよび長孔部７９７ａの上端部分７９７ｃを貫通している。
　溝部形成片切り欠き部７７７ａは、第１斜め方向に延びていて上下方向の寸法がピン７９３の外形とほぼ同じに設定されている。このため、溝部形成片切り欠き部７７７ａを貫通しているピン７９３は、溝部形成片切り欠き部７７７ａが形成されたレール部材７７と上下方向に相対移動できず、溝部形成片切り欠き部７７７ａに沿って第１斜め方向のみに相対移動するように構成されている。 Therefore, the pin 793 penetrates the groove forming piece cutout portion 777a and the lower end portion 797b of the elongated hole portion 797a in the normal state, and in the operating state, the groove forming piece cutout portion 777a and the upper end portion 797c of the elongated hole portion 797a. Penetrates.
The groove forming piece cutout portion 777a extends in the first diagonal direction and has a vertical dimension set to be substantially the same as the outer shape of the pin 793. Therefore, the pin 793 penetrating the groove forming piece cutout portion 777a cannot move in the vertical direction relative to the rail member 77 in which the groove forming piece cutout portion 777a is formed, and thus the pin 793 does not move to the groove portion forming cutout portion 777a. It is configured to relatively move only along the first diagonal direction.
　長孔部７９７ａの上端部分７９７ｃは、下端部分７９７ｂよりも第１斜め方向の内側に配置されている。このため、ピン７９３は、操作状態となって上端部分７９７ｃを貫通した状態となると、通常状態よりも第１斜め方向の内側に配置されることになる。
　ガイド片７９８は、通常状態および操作状態のいずれの状態でも凸条部下側部分７７９の第１斜め方向の内側の面（凸条部７７２の先端面７７２ｅ）と当接、または僅かな隙間をあけて対向している。これにより、通常状態から操作状態、および操作状態から通常状態に変位する移動部７９１は、常に凸条部７７２の凸条部下側部分７７９に沿って上下方向に変位し、第１斜め方向などの水平方向に変位したり、回動したりすることが防止されている。 The upper end portion 797c of the long hole portion 797a is arranged inside the lower end portion 797b in the first diagonal direction. Therefore, when the pin 793 is in the operated state and penetrates the upper end portion 797c, the pin 793 is arranged on the inner side in the first diagonal direction from the normal state.
The guide piece 798 is in contact with the inner surface (the front end surface 772e of the ridge 772e) of the ridge lower part 779 in the first oblique direction in either of the normal state and the operating state, or makes a slight gap. Are facing each other. As a result, the moving portion 791 that is displaced from the normal state to the operating state and from the operating state to the normal state is always displaced vertically along the ridge lower side portion 779 of the ridge 772, such as in the first diagonal direction. It is prevented from being displaced or rotated in the horizontal direction.
　図２２に示すように、レール部材７７および高さ位置拘束手段７９は、肘掛け本体カバー部７１４の内部に、肘掛け本体カバー部７１４の内板部７８２の第１斜め方向の外側に配置されるように設置されている。
　レール部材７７の凸条部７７２は、内板部７８２の前側肘掛け本体カバー溝部７１４ａと後側肘掛け本体カバー溝部７１４ｂとの間と第１斜め方向に重なる位置に配置され、凸条部７７２の先端面７７２ｅが内板部７８２と当接している。
　図１８に示すように、内板部７８２の下側内板部７８４は、凸条部７７２にネジなどの固定具で固定されている。 As shown in FIG. 22, the rail member 77 and the height position restraint means 79 are arranged inside the armrest main body cover portion 714 and outside the inner plate portion 782 of the armrest main body cover portion 714 in the first oblique direction. It is installed in.
The ridge portion 772 of the rail member 77 is arranged at a position that overlaps between the front armrest main body cover groove portion 714a and the rear armrest main body cover groove portion 714b of the inner plate portion 782 in the first diagonal direction, and the tip of the ridge portion 772. The surface 772e is in contact with the inner plate portion 782.
As shown in FIG. 18, the lower inner plate portion 784 of the inner plate portion 782 is fixed to the ridge portion 772 by a fixture such as a screw.
　レール部材７７の上側突出片７７３の下面は、上側内板部７８５の２つの上側溝部７８５ａの上端部と同じ高さに配置され、レール部材７７の下側突出片７７４の上面は、下側内板部７８４の２つの下側溝部７８４ａの下端部と同じ高さに配置されている。 The lower surface of the upper protruding piece 773 of the rail member 77 is arranged at the same height as the upper ends of the two upper groove portions 785a of the upper inner plate portion 785, and the upper surface of the lower protruding piece 774 of the rail member 77 is the lower side. It is arranged at the same height as the lower end portions of the two lower groove portions 784a of the inner plate portion 784.
　凸条部７７２の溝部形成片突出部７７７、高さ位置拘束手段７９の移動部７９１のピン支持部７９７、ガイド片７９８、およびピン７９３は、内板部７８２の肘掛け本体カバー切り欠き部７１４ｃに配置されている。凸条部７７２の溝部形成片突出部７７７、高さ位置拘束手段７９の移動部７９１ピン支持部７９７およびガイド片７９８は、内板部７８２よりも第１斜め方向の内側に突出している。ピン７９３は、第１斜め方向の内側に移動すると、内板部７８２よりも第１斜め方向の内側に配置される。 The groove forming piece projecting portion 777 of the ridge portion 772, the pin supporting portion 797 of the moving portion 791 of the height position restraining means 79, the guide piece 798, and the pin 793 are provided in the armrest main body cover cutout portion 714c of the inner plate portion 782. It is arranged. The groove forming piece projecting portion 777 of the ridge portion 772, the moving portion 791 pin supporting portion 797 and the guide piece 798 of the height position restraining means 79 project further inward in the first diagonal direction than the inner plate portion 782. When the pin 793 moves inward in the first diagonal direction, the pin 793 is arranged inward of the inner plate portion 782 in the first diagonal direction.
　図２５に示すように、凸条部７７２は、前側肘掛け本体カバー溝部７１４ａおよび後側肘掛け本体カバー溝部７１４ｂを貫通して肘掛け本体カバー部７１４の内部に配置された肘掛け本体支持部７２の前側突出片７４２と後側突出片７５２との間の昇降溝部７４４に挿入されている。
　第２基部７７１の内側面７７１ａは、前側突出片７４２および後側突出片７５２の先端面と滑り材７６１，７６２を介して当接している。 As shown in FIG. 25, the ridge portion 772 penetrates through the front armrest main body cover groove portion 714a and the rear armrest main body cover groove portion 714b and protrudes from the front side of the armrest main body support portion 72 disposed inside the armrest main body cover portion 714. It is inserted in the elevating groove portion 744 between the piece 742 and the rear protruding piece 752.
The inner side surface 771a of the second base portion 771 is in contact with the front end surfaces of the front side protruding piece 742 and the rear side protruding piece 752 via the sliding members 761 and 762.
　凸条部７７２の前面７７２ａは、前側突出片７４２の後面７４２ｂと間隔をあけて対向している。凸条部７７２の前面７７２ａの凸条部前側溝部７７２ｃは、前側突出片７４２の後面７４２ｂの２つの第１前側突出片溝部７４５それぞれと対向している。
　凸条部前側溝部７７２ｃと２つの第１前側突出片溝部７４５それぞれとの間には上下方向に延びる円柱状の第１抜け止め防止部材７６３が設けられている。第１抜け止め防止部材７６３の表面は滑り面に形成されている。 The front surface 772a of the protruding portion 772 faces the rear surface 742b of the front protruding piece 742 with a space therebetween. The ridge front groove portion 772c of the front surface 772a of the ridge portion 772 faces each of the two first front protruding piece groove portions 745 of the rear surface 742b of the front protruding piece 742.
A columnar first retaining member 763 extending in the up-down direction is provided between the ridge front groove portion 772c and each of the two first front protruding piece groove portions 745. The surface of the first retaining member 763 is a sliding surface.
　２つの第１抜け止め防止部材７６３は、第１前側突出片溝部７４５の長さ方向の寸法よりもやや短い長さ寸法に形成され、前側部分が２つの第１前側突出片溝部７４５それぞれに挿入されている。第１前側突出片溝部７４５に挿入された第１抜け止め防止部材７６３は、第１前側突出片溝部７４５の前側突出片溝部上側端面７４５ａおよび前側突出片溝部下側端面７４５ｂと当接することによって前側突出片７４２に対する上下方向の変位が規制されている。
　第１抜け止め防止部材７６３の後側部分は、凸条部７７２の凸条部前側溝部７７２ｃに挿入されている。凸条部前側溝部７７２ｃに挿入された第１抜け止め防止部材７６３は、凸条部７７２に対して凸条部前側溝部７７２ｃに沿って上下方向に相対変位可能に構成されている。 The two first retaining members 763 are formed to have a length dimension slightly shorter than the lengthwise dimension of the first front protruding piece groove portion 745, and the front portion is inserted into each of the two first front protruding piece groove portions 745. Has been done. The first retaining member 763 inserted into the first front protruding piece groove portion 745 is brought into contact with the front protruding piece groove upper end surface 745a and the front protruding piece groove lower end surface 745b of the first front protruding piece groove portion 745. Vertical displacement with respect to the protruding piece 742 is restricted.
The rear side portion of the first retaining member 763 is inserted into the ridge front groove portion 772c of the ridge portion 772. The first retaining prevention member 763 inserted in the ridge front groove 772c is configured to be vertically displaceable relative to the ridge 772 along the ridge front groove 772c.
　凸条部７７２の後面７７２ｂは、後側突出片７５２の前面７５２ａと間隔をあけて対向している。凸条部７７２の後面７７２ｂの凸条部後側溝部７７２ｄは、後側突出片７５２の前面７５２ａの２つの第１後側突出片溝部７５５それぞれと対向している。
　凸条部後側溝部７７２ｄと２つの第１後側突出片溝部７５５それぞれとの間には上下方向に延びる円柱状の第２抜け止め防止部材７６４が設けられている。第２抜け止め防止部材７６４の表面は滑り面に形成されている。
　凸条部前側溝部７７２ｃと２つの第１後側突出片溝部７５５それぞれとの間には上下方向に延びる円柱状の第２抜け止め防止部材７６４が設けられている。第２抜け止め防止部材７６４の表面は滑り面に形成されている。 The rear surface 772b of the ridge 772 faces the front surface 752a of the rear protruding piece 752 with a space. The ridge portion rear side groove portion 772d of the rear surface 772b of the ridge portion 772 faces each of the two first rear side protruding piece groove portions 755 of the front surface 752a of the rear side protruding piece 752.
A columnar second retaining member 764 extending in the up-down direction is provided between the ridge rear groove portion 772d and each of the two first rear protruding piece groove portions 755. The surface of the second retaining member 764 is formed as a sliding surface.
A columnar second retaining member 764 extending in the up-down direction is provided between the ridge front groove portion 772c and each of the two first rear protruding piece groove portions 755. The surface of the second retaining member 764 is formed as a sliding surface.
　第２抜け止め防止部材７６４は、第１後側突出片溝部７５５の長さ方向の寸法よりもやや短い長さ寸法に形成され、前側部分が２つの第１後側突出片溝部７５５それぞれに挿入されている。第１後側突出片溝部７５５に挿入された第２抜け止め防止部材７６４は、第１後側突出片溝部７５５の後側突出片溝部上側端面７５５ａおよび後側突出片溝部下側端面７５５ｂと当接することによって後側突出片７５２に対する上下方向の変位が規制されている。
　２つの第２抜け止め防止部材７６４の後側部分は、凸条部７７２の凸条部後側溝部７７２ｄに挿入されている。凸条部後側溝部７７２ｄに挿入された第２抜け止め防止部材７６４は、凸条部７７２と凸条部後側溝部７７２ｄに沿って上下方向に相対変位可能に構成されている。 The second retaining member 764 is formed to have a length dimension slightly shorter than the dimension of the first rear side protruding piece groove portion 755 in the length direction, and the front portion is inserted into each of the two first rear side protruding piece groove portions 755. Has been done. The second retaining member 764 inserted into the first rear projecting piece groove portion 755 is in contact with the rear projecting piece groove portion upper end surface 755a of the first rear projecting piece groove portion 755 and the rear projecting piece groove portion lower end surface 755b. By making contact with each other, displacement in the vertical direction with respect to the rear protruding piece 752 is restricted.
The rear side portions of the two second retaining prevention members 764 are inserted into the rear projection groove portions 772d of the projection portion 772. The second retaining member 764 inserted in the rear projection groove portion 772d is configured to be vertically displaceable along the projection portion 772 and the rear projection groove portion 772d.
　このような肘掛け本体７１は、レール部材７７の凸条部７７２が肘掛け本体支持部７２の昇降溝部７４４に挿入された状態で、肘掛け本体支持部７２に対して、上下方向に昇降可能に構成されている。そして、上述したように、レール部材７７の凸条部７７２と肘掛け本体支持部７２の前側突出片７４２と間に凸条部前側溝部７７２ｃおよび第１前側突出片溝部７４５に一体に挿入された第１抜け止め防止部材７６３が設けられ、レール部材７７の凸条部７７２と肘掛け本体支持部７２の後側突出片７５２との間に凸条部後側溝部７７２ｄおよび第１後側突出片溝部７５５に一体に挿入された第２抜け止め防止部材７６４が設けられている。
　これにより、肘掛け本体７１および肘掛け本体支持部７２に、互いが第１斜め方向に沿って離間するような力が作用した場合でも、肘掛け本体支持部７２がレール部材７７から離れて肘掛け本体７１から抜け出ることが防止されている。 Such an armrest main body 71 is configured to be able to move up and down with respect to the armrest main body support portion 72 in a state where the ridge portion 772 of the rail member 77 is inserted into the elevating groove portion 744 of the armrest main body support portion 72. ing. Then, as described above, the ridge portion front side groove portion 772c and the first front side protruding piece groove portion 745 are integrally inserted between the ridge portion 772 of the rail member 77 and the front side protruding piece 742 of the armrest main body support portion 72. The first retaining prevention member 763 is provided, and the ridge rear groove portion 772d and the first rear protruding piece groove portion are provided between the ridge portion 772 of the rail member 77 and the rear protruding piece 752 of the armrest main body supporting portion 72. A second retaining member 764 that is integrally inserted in 755 is provided.
Thereby, even when a force acts on the armrest main body 71 and the armrest main body support portion 72 so as to separate them from each other along the first diagonal direction, the armrest main body support portion 72 separates from the rail member 77 and is separated from the armrest main body 71. It is prevented from getting out.
　肘掛け本体支持部７２の前側突出片７４２に形成された凸条部前側溝部７７２ｃ、後側突出片７５２に形成された凸条部後側溝部７７２ｄ、レール部材７７の凸条部７７２に形成された凸条部前側溝部７７２ｃ、凸条部後側溝部７７２ｄ、第１抜け止め防止部材７６３および第２抜け止め防止部材７６４は、凸条部７７２が昇降溝部７４４に挿入された肘掛け本体７１と肘掛け本体支持部７２とが第１斜め方向の互いに離間する側に移動することを規制する移動規制部を構成している。 The ridge front groove 772c formed on the front protruding piece 742 of the armrest main body support 72, the ridge rear groove 772d formed on the rear protruding piece 752, and the ridge 772 of the rail member 77 are formed. The protruding ridge front side groove 772c, the protruding ridge rear side groove 772d, the first retaining prevention member 763 and the second retaining prevention member 764 are the armrest main body 71 in which the protruding ridge 772 is inserted into the elevating groove 744. The armrest main body supporting portion 72 constitutes a movement restricting portion that restricts movement of the armrest main body supporting portion 72 in the first diagonal direction away from each other.
　図２３および図２４に示すように、高さ位置拘束手段７９のピン７９３は、一方の端部（第２斜め方向の前側の端部）が前側突出片７４２の第２前側突出片溝部７４６に挿入され、他方の端部（第２斜め方向の後側の端部）が後側突出片７５２の第２後側突出片溝部７５６に挿入されている。
　ピン７９３は、通常状態では第２前側突出片溝部７４６の複数の突出溝部７４６ｂのうちのいずれか１つおよび第２後側突出片溝部７５６の複数の突出溝部７５６ｂのうちのいずれか１つに挿入されている。通常状態でピン７９３が挿入される第２前側突出片溝部７４６の突出溝部７４６ｂと第２後側突出片溝部７５６の突出溝部７５６ｂとは同じ高さに位置している。
　ピン７９３は、第２前側突出片溝部７４６の突出溝部７４６ｂおよび第２後側突出片溝部７５６の突出溝部７５６ｂに挿入されると、上下方向の移動が拘束されている。 As shown in FIGS. 23 and 24, the pin 793 of the height position restraining means 79 has one end (the end on the front side in the second diagonal direction) in the second front protruding piece groove portion 746 of the front protruding piece 742. The other end (the end on the rear side in the second diagonal direction) is inserted into the second rear protruding piece groove portion 756 of the rear protruding piece 752.
In the normal state, the pin 793 is provided in any one of the plurality of protruding groove portions 746b of the second front protruding piece groove portion 746 and in any one of the plurality of protruding groove portions 756b of the second rear protruding piece groove portion 756. Has been inserted. The protruding groove portion 746b of the second front protruding piece groove portion 746 into which the pin 793 is inserted in the normal state and the protruding groove portion 756b of the second rear protruding piece groove portion 756 are located at the same height.
When the pin 793 is inserted into the projecting groove portion 746b of the second front projecting piece groove portion 746 and the projecting groove portion 756b of the second rear projecting piece groove portion 756, the vertical movement is restricted.
　ピン７９３は、移動部７９１が操作レバー７１５の操作によって下側に押されて通常状態から操作状態となると、通常状態の位置よりも第１斜め方向の内側に配置される。このため、ピン７９３は、前側突出片７４２の第２前側突出片溝部７４６の上下溝部７４６ａおよび後側突出片７５２の第２後側突出片溝部７５６の上下溝部７５６ａに挿入される。
　ピン７９３は、上下溝部７４６ａ、７５６ａに挿入されると上下方向に移動可能となる。
　この状態で、着座者が肘掛け本体７１を引き上げたり押し下げたりすることで肘掛け本体７１が昇降する。肘掛け本体７１を所望の高さとし、操作レバー７１５の操作を解除すると、移動部７９１が上側に移動し、ピン７９３が操作状態の位置よりも第１斜め方向の外側に配置される。これにより、ピン７９３は、第２前側突出片溝部７４６の突出溝部７４６ｂおよび第２後側突出片溝部７５６の突出溝部７５６ｂに挿入されると、上下方向の移動が拘束される。 When the moving portion 791 is pushed downward by the operation of the operation lever 715 to change from the normal state to the operation state, the pin 793 is arranged inside the position in the normal state in the first diagonal direction. Therefore, the pin 793 is inserted into the vertical groove portion 746a of the second front protruding piece groove portion 746 of the front protruding piece 742 and the vertical groove portion 756a of the second rear protruding piece groove portion 756 of the rear protruding piece 752.
When the pin 793 is inserted into the vertical groove portions 746a and 756a, it can move in the vertical direction.
In this state, when the seated person pulls up or pushes down the armrest main body 71, the armrest main body 71 moves up and down. When the armrest main body 71 is set to a desired height and the operation of the operation lever 715 is released, the moving portion 791 moves upward, and the pin 793 is arranged outside the position in the operating state in the first diagonal direction. Accordingly, when the pin 793 is inserted into the projecting groove portion 746b of the second front projecting piece groove portion 746 and the projecting groove portion 756b of the second rear projecting piece groove portion 756, the movement in the vertical direction is restrained.
　図１２および図１３に示すように、カバー部材７３は、肘掛け本体支持部７２の第１基部７２１を覆っている。カバー部材７３は、筒状に形成されていて、第１斜め方向に開口する向きに配置されている。カバー部材７３は、第１基部７２１の前面７２１ａを覆う前板部７３１と、第１基部７２１の後面７２１ｂを覆う後板部７３２と、第１基部７２１の上面７２１ｃを覆う上板部７３３、第１基部７２１の下面７２１ｄを覆う下板部７３４と、を有している。 As shown in FIGS. 12 and 13, the cover member 73 covers the first base portion 721 of the armrest main body support portion 72. The cover member 73 is formed in a tubular shape, and is arranged so as to open in the first diagonal direction. The cover member 73 includes a front plate portion 731 that covers the front surface 721a of the first base portion 721, a rear plate portion 732 that covers the rear surface 721b of the first base portion 721, an upper plate portion 733 that covers the upper surface 721c of the first base portion 721, and And a lower plate portion 734 that covers the lower surface 721d of the first base portion 721.
　前板部７３１は、上端部が第１基部７２１の上面７２１ｃよりも上側に位置し、下端部が第１基部７２１の下面７２１ｄよりも下側に位置している。前板部７３１の第１斜め方向の内側の端部は、第１基部７２１の第１側面７２１ｅと重なる位置に配置されている。前板部７３１の第１斜め方向の外側の縁部は、第１基部７２１の第１斜め方向外側の縁部と重なる位置に配置されている。
　前板部７３１の前面７３１ａには、第１斜め方向の中間部に上下方向に延びる前板段部７３１ｂが形成されている。前板部７３１は、前板段部７３１ｂよりも第１斜め方向の外側の外側部分７３１ｃが前板段部７３１ｂよりも第１斜め方向の内側の内側部分７３１ｄよりも前側に位置している。 The front plate portion 731 has an upper end portion located above the upper surface 721c of the first base portion 721 and a lower end portion located below the lower surface 721d of the first base portion 721. The inner end portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the first side surface 721e of the first base portion 721. The outer edge portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the outer edge portion of the first base portion 721 in the first diagonal direction.
On the front surface 731a of the front plate portion 731, a front plate step portion 731b extending vertically is formed at an intermediate portion in the first diagonal direction. In the front plate portion 731, an outer portion 731c on the outer side of the front plate step portion 731b in the first diagonal direction is located on the front side of an inner portion 731d on the inner side of the front plate step portion 731b in the first diagonal direction.
　後板部７３２は、上端部が第１基部７２１の上面７２１ｃよりも上側に位置し、下端部が第１基部７２１の下面７２１ｄよりも下側に位置している。前板部７３１の第１斜め方向の内側の端部は、第１基部７２１の第１側面７２１ｅと重なる位置に配置されている。前板部７３１の第１斜め方向の外側の縁部は、第１基部７２１の第１斜め方向外側の縁部と重なる位置に配置されている。 The rear plate 732 has an upper end located above the upper surface 721c of the first base 721 and a lower end located below the lower surface 721d of the first base 721. The inner end portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the first side surface 721e of the first base portion 721. The outer edge portion of the front plate portion 731 in the first diagonal direction is arranged at a position overlapping the outer edge portion of the first base portion 721 in the first diagonal direction.
　上板部７３３は、前縁部が前板部７３１の上縁部と接続され、後縁部が後板部７３２の上縁部と接続されている。上板部７３３の第１斜め方向の外側の縁部は、第１基部７２１の第１斜め方向の外側の縁部近傍と重なる位置に配置されている。上板部７３３は、前板部７３１および後板部７３２よりも幅方向の内側に突出している。上板部７３３における前板部７３１および後板部７３２よりも幅方向の内側に突出している部分を突出板部７３３ｂとする。突出板部７３３ｂは、第１基部７２１よりも幅方向の内側に突出している。
　上板部７３３の下側には、上板部７３３の下面から下側に突出する上リブ７３５が複数形成されている。上リブ７３５は、下端部が第１基部７２１の上面７２１ｃと当接するように構成されている。 A front edge portion of the upper plate portion 733 is connected to an upper edge portion of the front plate portion 731, and a rear edge portion thereof is connected to an upper edge portion of the rear plate portion 732. The outer edge of the upper plate portion 733 in the first diagonal direction is arranged at a position overlapping the vicinity of the outer edge of the first base portion 721 in the first diagonal direction. The upper plate portion 733 projects more inward in the width direction than the front plate portion 731 and the rear plate portion 732. A portion of the upper plate portion 733 that projects inward in the width direction with respect to the front plate portion 731 and the rear plate portion 732 is referred to as a protruding plate portion 733b. The projecting plate portion 733b projects further inward in the width direction than the first base portion 721.
A plurality of upper ribs 735 projecting downward from the lower surface of the upper plate portion 733 are formed below the upper plate portion 733. The upper rib 735 is configured such that the lower end portion thereof contacts the upper surface 721c of the first base portion 721.
　下板部７３４は、前縁部が前板部７３１の下縁部と接続され、後縁部が後板部７３２の下縁部と接続されている。下板部７３４の幅方向の外側の縁部は、第１基部７２１の幅方向の外側の縁部近傍と重なる位置に配置されている。下板部７３４の幅方向の内側の縁部は、第１基部７２１の第１側面７２１ｅの下側に重なる位置に配置されている。
　下板部７３４の上側には、下板部７３４の上面から上側に突出する複数の下側リブ７３６と、下側リブ７３６の上側に設けられる内板部７３７と、が設けられている。内板部７３７は、板面が略上下方向を向き、前縁部が前板部７３１に接続され、後縁部が後板部７３２に接続されている。内板部７３７の上面は、第１基部７２１の下面７２１ｄと当接するように構成されている。 The lower plate portion 734 has a front edge portion connected to the lower edge portion of the front plate portion 731 and a rear edge portion connected to the lower edge portion of the rear plate portion 732. The outer edge in the width direction of the lower plate portion 734 is arranged at a position overlapping the vicinity of the outer edge in the width direction of the first base portion 721. The inner edge in the width direction of the lower plate portion 734 is arranged at a position overlapping the lower side of the first side surface 721e of the first base portion 721.
A plurality of lower ribs 736 protruding upward from the upper surface of the lower plate portion 734 and an inner plate portion 737 provided on the upper side of the lower rib 736 are provided on the upper side of the lower plate portion 734. The plate surface of the inner plate portion 737 is oriented substantially vertically, the front edge portion is connected to the front plate portion 731, and the rear edge portion is connected to the rear plate portion 732. The upper surface of the inner plate portion 737 is configured to contact the lower surface 721d of the first base portion 721.
（肘掛けの組立方法）
　肘掛け７は、肘掛け本体７１と肘掛け本体支持部７２とが連結され、肘掛け本体７１に連結された肘掛け本体支持部７２の第１基部７２１にカバー部材７３が取り付けられた状態で、肘掛け本体支持部７２が背凭れ支持部２４に固定されている。
　肘掛け７を組み立てるには、まず、図１９に示すように、上部杆７１１の板金部材７１６とレール部材７７とを溶接する。なお、図１９では、肘置き部１３および上板部７８３が取り付けられているが、本実施形態では、肘置き部１３および上板部７８３は、後の工程で取り付けるものとする。
　続いて、高さ位置拘束手段７９をレール部材７７に取り付けるとともに、操作レバー７１５を板金部材７１６に回動可能に取り付ける。
　高さ位置拘束手段７９のばね７９４をレール部材７７の凸条部下側部分７７９の上部に設置し、高さ位置拘束手段７９の移動部７９１をレール部材７７の凸条部先端側溝部７７５に配置する。ばね７９４は、移動部７９１のピン支持部７９７と凸条部下側部分７７９との間に挟まれた状態となる。
　移動部７９１のピン支持部７９７の長孔部７９７ａおよびレール部材７７の２つの溝部形成片突出部７７７の溝部形成片切り欠き部７７７ａにピン７９３を第２斜め方向から挿入する。
　操作レバー７１５の押圧部７１５ｂを移動部７９１の操作レバー接続部７９６の上部に配置する。 (How to assemble the armrest)
The armrest main body 7 is connected to the armrest main body 71 and the armrest main body support portion 72, and the cover member 73 is attached to the first base 721 of the armrest main body support portion 72 connected to the armrest main body 71. 72 is fixed to the backrest support portion 24.
To assemble the armrest 7, first, as shown in FIG. 19, the sheet metal member 716 of the upper rod 711 and the rail member 77 are welded. Note that, in FIG. 19, the elbow rest 13 and the upper plate 783 are attached, but in the present embodiment, the elbow rest 13 and the upper plate 783 are attached in a later step.
Subsequently, the height position restraint means 79 is attached to the rail member 77, and the operation lever 715 is attached to the sheet metal member 716 so as to be rotatable.
The spring 794 of the height position restraining means 79 is installed on the upper portion of the lower ridge portion 779 of the rail member 77, and the moving portion 791 of the height position restraining means 79 is arranged in the groove portion 775 of the ridge portion of the rail member 77. To do. The spring 794 is in a state of being sandwiched between the pin support portion 797 of the moving portion 791 and the ridge lower portion 779.
The pin 793 is inserted from the second diagonal direction into the long hole portion 797a of the pin support portion 797 of the moving portion 791 and the groove portion formation piece cutout portion 777a of the two groove portion formation piece protrusion portions 777 of the rail member 77.
The pressing portion 715b of the operation lever 715 is arranged above the operation lever connecting portion 796 of the moving portion 791.
　続いて、図２６に示すように、レール部材７７と肘掛け本体支持部７２の前側部材７４および後側部材７５とを、連結する。
　まず、図２５に示す前側部材７４の第１前側突出片溝部７４５に第１抜け止め防止部材７６３を設置し、後側部材７５の第１後側突出片溝部７５５に第２抜け止め防止部材７６４を設置する。
　また、前側部材７４の前側突出片７４２の第１斜め方向の外側の端面および後面に、第１滑り材７６１を張り付け、後側部材７５の後側突出片７５２の第１斜め方向の外側の端面および前面に、第２滑り材７６２を張り付ける。 Subsequently, as shown in FIG. 26, the rail member 77 and the front side member 74 and the rear side member 75 of the armrest main body support portion 72 are connected.
First, the first retaining member 763 is installed in the first front protruding piece groove portion 745 of the front member 74 shown in FIG. 25, and the second retaining member 764 is installed in the first rear protruding piece groove portion 755 of the rear member 75. Set up.
Further, the first sliding member 761 is attached to the outer end surface and the rear surface of the front projecting piece 742 of the front member 74 in the first diagonal direction, and the first slanting outer end surface of the rear projecting piece 752 of the rear member 75. Then, the second sliding member 762 is attached to the front surface.
　そして、前側部材７４の前側突出片７４２と後側部材の後側突出片７５２とでレール部材７７の凸条部７７２を前後方向から挟み、第１抜け止め防止部材７６３を、レール部材７７の凸条部前側溝部７７２ｃに配置し、第２抜け止め防止部材７６４を、凸条部後側溝部７７２ｄに配置する。そして、前側部材７４の前側連結部７４１と後側部材７５の後側連結部７５１とをボルトなどの連結具で連結する。 The front protruding piece 742 of the front member 74 and the rear protruding piece 752 of the rear member sandwich the ridge portion 772 of the rail member 77 from the front-rear direction, so that the first retaining member 763 protrudes from the rail member 77. The second retaining member 764 is disposed in the front groove portion 772c of the ridge portion, and the second retaining member 764 is disposed in the rear groove portion 772d of the ridge portion. Then, the front connecting portion 741 of the front member 74 and the rear connecting portion 751 of the rear member 75 are connected by a connecting tool such as a bolt.
　前側部材７４は、前側突出片７４２に張り付けられた第１滑り材７６１がレール部材７７の第２基部７７１の内側面７７１ａおよび凸条部７７２の前面７７２ａと当接している。後側部材７５は、後側突出片７５２に張り付けられた第２滑り材７６２がレール部材７７の第２基部７７１の内側面７７１ａおよび凸条部７７２の後面７７２ｂと当接している。なお、レール部材７７に滑り材が張り付けられて、その滑り材に前側突出片７４２および後側突出片７５２が摺動可能に当接していてもよい。
　ここで、上記のように設置された、板金部材７１６、レール部材７７、高さ位置拘束手段７９および操作レバー７１５を肘掛け内部材７１７とする。 In the front member 74, the first sliding member 761 attached to the front protruding piece 742 is in contact with the inner side surface 771a of the second base portion 771 of the rail member 77 and the front surface 772a of the ridge portion 772. In the rear member 75, the second sliding member 762 attached to the rear protruding piece 752 is in contact with the inner surface 771a of the second base portion 771 of the rail member 77 and the rear surface 772b of the ridge portion 772. A sliding member may be attached to the rail member 77, and the front protruding piece 742 and the rear protruding piece 752 may slidably contact the sliding member.
Here, the sheet metal member 716, the rail member 77, the height position restraining means 79, and the operation lever 715 installed as described above are referred to as an armrest inner member 717.
　続いて、肘掛け内部材７１７に肘掛け本体カバー部７１４の上板部７８３以外を取り付ける。
　まず、図２７に示すように、肘掛け本体支持部７２の前側部材７４および後側部材７５をレール部材７７の上部側に移動させ、肘掛け本体カバー部７１４の下側内板部７８４をレール部材７７の下部側に取り付ける。図２８に示すように、肘掛け本体カバー部７１４の本体部７８１を、肘掛け内部材７１７に下側から取り付ける。このとき、下側内板部７８４を、本体部７８１の開口部７８１ａの下部側にはめ込む。
　図１８に示す肘掛け本体カバー部７１４の上側内板部７８５を本体部７８１の開口部７８１ａに上側から差し込んではめ込む。これにより、肘掛け内部材７１７に肘掛け本体カバー部７１４上板部７８３以外が取り付けられる。 Subsequently, the members other than the upper plate portion 783 of the armrest main body cover portion 714 are attached to the armrest inner member 717.
First, as shown in FIG. 27, the front member 74 and the rear member 75 of the armrest main body support portion 72 are moved to the upper side of the rail member 77, and the lower inner plate portion 784 of the armrest main body cover portion 714 is moved to the rail member 77. Install on the bottom side of. As shown in FIG. 28, the body part 781 of the armrest body cover part 714 is attached to the armrest inner member 717 from the lower side. At this time, the lower inner plate portion 784 is fitted into the lower portion of the opening portion 781a of the main body portion 781.
The upper inner plate portion 785 of the armrest main body cover portion 714 shown in FIG. 18 is inserted into the opening portion 781a of the main body portion 781 from above and fitted. As a result, parts other than the armrest main body cover portion 714 upper plate portion 783 are attached to the armrest inner member 717.
　続いて、肘掛け本体７１と連結された肘掛け本体支持部７２の第１基部７２１にカバー部材７３を取り付ける。
　カバー部材７３は、肘掛け本体支持部７２に第１斜め方向の内側から装着する。
　続いて、肘乗せ部７１３を板金部材７１６に固定する。肘掛け本体カバー部７１４の上板部７８３を肘掛け本体カバー部７１４の本体部７８１および上側内板部７８５の上部に取り付ける。なお、肘乗せ部７１３の板金部材７１６への固定および肘掛け本体カバー部７１４の上板部７８３の取り付けは、肘掛け７を背凭れ支持部２４に固定した後に行ってもよい。
　本実施形態では、上記のように肘掛け本体７１と肘掛け本体支持部７２とが連結されると、レール部材７７の下側突出片７７４および上側突出片７７３は、肘掛け本体カバー部７１４と係合して連結されるように構成されている。これにより、レール部材７７と肘掛け本体カバー部７１４との位置ずれが防止される。 Subsequently, the cover member 73 is attached to the first base portion 721 of the armrest main body support portion 72 connected to the armrest main body 71.
The cover member 73 is attached to the armrest main body support portion 72 from the inside in the first diagonal direction.
Subsequently, the elbow rest 713 is fixed to the sheet metal member 716. The upper plate portion 783 of the armrest body cover portion 714 is attached to the upper portion of the body portion 781 of the armrest body cover portion 714 and the upper inner plate portion 785. The armrest portion 713 may be fixed to the metal plate member 716 and the upper plate portion 783 of the armrest main body cover portion 714 may be fixed after the armrest 7 is fixed to the backrest support portion 24.
In the present embodiment, when the armrest main body 71 and the armrest main body support portion 72 are connected as described above, the lower protruding piece 774 and the upper protruding piece 773 of the rail member 77 engage with the armrest main body cover portion 714. Are configured to be connected. This prevents the rail member 77 and the armrest body cover portion 714 from being displaced.
　肘掛け本体７１と肘掛け本体支持部７２とが連結されると、肘掛け本体７１のレール部材７７と肘掛け本体支持部７２の前側突出片７４２および後側突出片７５２とが互いに摺動して上下方向に相対変位することで、肘掛け本体７１が肘掛け本体支持部７２に対して高さを変えることができる。
　図１２および図１３に示すように、肘掛け本体７１が肘掛け本体支持部７２に対して最下位置にあると、肘掛け本体支持部７２がレール部材７７の上部側に位置している。図２６に示すように、レール部材７７は、上側突出片７７３が肘掛け本体支持部７２の前側突出片７４２および後側突出片７５２の上端部と当接すると、これ以上の肘掛け本体支持部７２に対する下側への移動が拘束される。 When the armrest main body 71 and the armrest main body supporting portion 72 are connected, the rail member 77 of the armrest main body 71 and the front protruding piece 742 and the rear protruding piece 752 of the armrest main body supporting portion 72 slide with respect to each other in the vertical direction. The relative displacement allows the armrest main body 71 to change its height with respect to the armrest main body support portion 72.
As shown in FIGS. 12 and 13, when the armrest main body 71 is at the lowest position with respect to the armrest main body support portion 72, the armrest main body support portion 72 is located on the upper side of the rail member 77. As shown in FIG. 26, when the upper projecting piece 773 comes into contact with the upper end portions of the front projecting piece 742 and the rear projecting piece 752 of the armrest main body supporting portion 72, the rail member 77 does not contact the armrest main body supporting portion 72 any further. Movement to the lower side is restricted.
　これに対し、図２９および図３０に示すように、肘掛け本体７１が肘掛け本体支持部７２に対して最上位置にあると、肘掛け本体支持部７２がレール部材７７の下部側に位置している。肘掛け本体７１がいずれの位置にある場合でも、肘掛け本体支持部７２は、高さ方向の全体がレール部材７７を係止した状態で肘掛け本体７１を支持している。図２９に示すように、レール部材７７は、下側突出片７７４が肘掛け本体支持部７２の前側突出片７４２および後側突出片７５２の下端部と当接すると、これ以上の肘掛け本体支持部７２に対する上側への移動が拘束される。 On the other hand, as shown in FIGS. 29 and 30, when the armrest main body 71 is at the uppermost position with respect to the armrest main body support portion 72, the armrest main body support portion 72 is located on the lower side of the rail member 77. Regardless of the position of the armrest main body 71, the armrest main body support portion 72 supports the armrest main body 71 in a state in which the rail member 77 is entirely locked in the height direction. As shown in FIG. 29, when the lower projecting piece 774 comes into contact with the lower end portions of the front projecting piece 742 and the rear projecting piece 752 of the armrest main body supporting portion 72, the rail member 77 is further armrest main body supporting portion 72. The upward movement with respect to is restricted.
（肘掛けの背凭れ支持部への取り付け方法）
　続いて、肘掛け７を背凭れ支持部２４に取り付ける方法について説明する。
　以下では、肘掛け７は、上記のように肘掛け本体支持部７２と肘掛け本体７１とが連結され、肘掛け本体支持部７２の第１基部７２１にカバー部材７３が取り付けられた状態であるものとする。
　また、肘掛け７は、背凭れ本体４１が背凭れ支持部２４に固定された後に、互いに連結された背凭れ支持部２４および背凭れ本体４１との間の凹部２７に肘掛け本体支持部７２およびカバー部材７３が差し込まれるようにして背凭れ支持部２４に固定される。上述しているが、凹部２７は、背凭れ支持部２４の突出板部２６、連結部５における連結部外側面５４、および背凭れ本体４１の縦枠部４６の面材係止部４６３に囲まれて第１斜め方向の外側に開口している。 (How to attach the armrest to the backrest support)
Next, a method of attaching the armrest 7 to the backrest support portion 24 will be described.
Hereinafter, it is assumed that the armrest 7 is in a state in which the armrest main body support portion 72 and the armrest main body 71 are connected as described above, and the cover member 73 is attached to the first base portion 721 of the armrest main body support portion 72.
The armrest 7 has an armrest body support portion 72 and a cover in a recess 27 between the backrest support portion 24 and the backrest body 41, which are connected to each other after the backrest body 41 is fixed to the backrest support portion 24. The member 73 is inserted and fixed to the backrest support portion 24. As described above, the recess 27 is surrounded by the protruding plate portion 26 of the backrest support portion 24, the connecting portion outer surface 54 of the connecting portion 5, and the face material locking portion 463 of the vertical frame portion 46 of the backrest body 41. Open in the first diagonal direction.
　図８および図９に示すように、肘掛け７を背凭れ支持部２４に固定するには、まず、肘掛け本体支持部７２における第１斜め方向の内側の部分を凹部２７に挿入する。
　このとき、肘掛け本体支持部７２の前側部材７４の上下２つの第４孔部７４３が連結部５の上下２つの第２孔部５６とそれぞれ第１斜め方向に重なるよう、肘掛け７を凹部２７に挿入する。
　そして、第１基部７２１の第１側面７２１ｅを背凭れ支持部２４の連結部５における連結部外側面５４と当接させるとともに、カバー部材７３の前板部７３１、後板部７３２および下板部７３４（図１３参照）それぞれの第１斜め方向の内側の縁部を連結部外側面５４と当接させる。カバー部材７３の上板部７３３の突出板部７３３ｂを連結部５の上側に配置し、突出板部７３３ｂの下面と連結部５の上面とを当接させる。カバー部材７３の前板部７３１の前面７３１ａにおける内側部分７３１ｄを背凭れ本体４１の縦枠部４６の面材係止部４６３の後面と当接させる。 As shown in FIGS. 8 and 9, in order to fix the armrest 7 to the backrest support portion 24, first, the inner portion of the armrest body support portion 72 in the first diagonal direction is inserted into the recess 27.
At this time, the armrest 7 is placed in the recess 27 so that the upper and lower second fourth hole portions 743 of the front member 74 of the armrest main body supporting portion 72 respectively overlap the upper and lower second hole portions 56 of the connecting portion 5 in the first diagonal direction. insert.
Then, the first side surface 721e of the first base portion 721 is brought into contact with the connecting portion outer surface 54 of the connecting portion 5 of the backrest support portion 24, and the front plate portion 731, the rear plate portion 732, and the lower plate portion of the cover member 73 are formed. Each of the edges 734 (see FIG. 13) on the inner side in the first diagonal direction is brought into contact with the outer surface 54 of the connecting portion. The protruding plate portion 733b of the upper plate portion 733 of the cover member 73 is arranged above the connecting portion 5, and the lower surface of the protruding plate portion 733b and the upper surface of the connecting portion 5 are brought into contact with each other. The inner portion 731d of the front surface 731a of the front plate portion 731 of the cover member 73 is brought into contact with the rear surface of the face material locking portion 463 of the vertical frame portion 46 of the backrest main body 41.
　連結部５および肘掛け本体支持部７２は、面材４３の後側に位置し、連結部５の第２孔部５６、および肘掛け本体支持部７２の第４孔部７４３は、幅方向の外側よりも前側を向く斜め方向に開口している。この第２孔部５６および第４孔部７４３の開口方向は、背凭れ本体４１に沿った方向となっている。そして、この第２孔部５６および第４孔部７４３の開口方向は、幅方向の内側から外側に向かって背凭れ面４３１に近接する方向となっている。
　第２ボルト６２は、第２孔部５６および第４孔部７４３に幅方向の内側から外側に向かって挿入される。このため、第２ボルト６２は、背凭れ面４３１と離間している側から背凭れ面４３１に近接する側に向かうようにして第２孔部５６および第４孔部７４３に挿通されるように構成されている。
　第２孔部５６および第４孔部７４３に幅方向の内側から第２ボルト６２を挿通してナットと締結することで、肘掛け本体支持部７２の前側部材７４が連結部５と連結され、肘掛け７が背凭れ支持部２４に固定される。
　このとき、連結部前面５１と、カバー部材７３の前板部７３１の前面７３１ａにおける内側部分７３１ｄと、は略面一に配置されている。 The connecting portion 5 and the armrest main body supporting portion 72 are located on the rear side of the face member 43, and the second hole portion 56 of the connecting portion 5 and the fourth hole portion 743 of the armrest main body supporting portion 72 are arranged from the outer side in the width direction. Also opens diagonally toward the front. The opening direction of the second hole portion 56 and the fourth hole portion 743 is along the backrest body 41. The opening direction of the second hole portion 56 and the fourth hole portion 743 is a direction that approaches the backrest surface 431 from the inner side to the outer side in the width direction.
The second bolt 62 is inserted into the second hole portion 56 and the fourth hole portion 743 from the inner side to the outer side in the width direction. Therefore, the second bolt 62 is inserted into the second hole portion 56 and the fourth hole portion 743 from the side separated from the backrest surface 431 toward the side close to the backrest surface 431. It is configured.
By inserting the second bolt 62 into the second hole portion 56 and the fourth hole portion 743 from the inner side in the width direction and fastening the second bolt 62, the front member 74 of the armrest main body supporting portion 72 is connected to the connecting portion 5, and the armrest. 7 is fixed to the backrest support portion 24.
At this time, the front surface 51 of the connecting portion and the inner portion 731d of the front surface 731a of the front plate portion 731 of the cover member 73 are arranged substantially flush with each other.
　肘掛け本体支持部７２およびカバー部材７３は、背凭れ支持部２４の突出板部２６と、縦枠部４６の面材係止部４６３と、に前後から挟まれた状態となり、肘掛け本体支持部７２およびカバー部材７３と連結部５との連結部分が被覆されている。縦枠部４６の面材係止部４６３の幅方向の外側の端部は、カバー部材７３の前板部７３１の前板段部７３１ｂに沿って配置され、前板段部７３１ｂに幅方向の内側から当接した状態となっている。このため、カバー部材７３と縦枠部４６とは幅方向にずれることが防止されている。 The armrest main body support portion 72 and the cover member 73 are sandwiched between the protruding plate portion 26 of the backrest support portion 24 and the face material locking portion 463 of the vertical frame portion 46 from the front and back, and the armrest main body support portion 72. Also, the connecting portion between the cover member 73 and the connecting portion 5 is covered. The widthwise outer end of the face material locking portion 463 of the vertical frame portion 46 is arranged along the front plate step portion 731b of the front plate portion 731 of the cover member 73, and is arranged in the width direction of the front plate step portion 731b. It is in contact with the inside. Therefore, the cover member 73 and the vertical frame portion 46 are prevented from shifting in the width direction.
　図２に示すように、肘掛け本体支持部７２およびカバー部材７３は、背凭れ本体４１よりも幅方向の外側に突出し、肘掛け本体支持部７２に支持された肘掛け本体７１は、背凭れ本体４１と離間し、外周枠部４２よりも幅方向の外側に位置している。肘掛け本体７１の上部杆７１１は、前後方向に延びている。肘掛け本体７１の上部杆７１１の肘乗せ部７１３は、背凭れ本体４１よりも前側に配置されているため、背凭れ本体４１と離間している。
　なお、肘掛け７を背凭れ支持部２４に固定した後に、背凭れ本体４１を背凭れ支持部２４に固定するようにしてもよい。 As shown in FIG. 2, the armrest main body supporting portion 72 and the cover member 73 project outward in the width direction from the backrest main body 41, and the armrest main body 71 supported by the armrest main body supporting portion 72 corresponds to the backrest main body 41. They are separated from each other and are located outside the outer peripheral frame portion 42 in the width direction. The upper rod 711 of the armrest main body 71 extends in the front-rear direction. Since the armrest portion 713 of the upper rod 711 of the armrest main body 71 is arranged on the front side of the backrest body 41, it is separated from the backrest body 41.
The armrest 7 may be fixed to the backrest support portion 24 and then the backrest body 41 may be fixed to the backrest support portion 24.
　次に、上述した本実施形態による背凭れおよび椅子の作用・効果について図面を用いて説明する。
　上述した本実施形態による肘掛け７、背凭れ４および椅子１では、肘掛け本体７１が肘掛け本体支持部７２に対して上下方向に昇降した際に、肘掛け本体７１が肘掛け本体支持部７２の上部側のみや下部側のみでなく、常に肘掛け本体支持部７２の高さ方向の全体に支持された状態となる。これにより、肘掛け本体７１を肘掛け本体支持部７２に対するいずれの高さにおいても安定した状態に設置することができる。
　また、肘掛け本体７１と肘掛け本体支持部７２との係合部分（凸条部７７２、前側突出片７４２および後側突出片７５２）が、肘掛け本体カバー部７１４の内部に配置されていることにより、肘掛け本体７１と肘掛け本体支持部７２との係合部分が露出することを防止することができ、肘掛け本体７１と肘掛け本体支持部７２との係合部分に人や物が接触する虞がなく安全性を向上させることができるとともに、意匠性を向上させることができる。 Next, the operation and effect of the backrest and chair according to the present embodiment described above will be described with reference to the drawings.
In the armrest 7, backrest 4 and chair 1 according to the present embodiment described above, when the armrest main body 71 moves up and down with respect to the armrest main body support portion 72, the armrest main body 71 is only on the upper side of the armrest main body support portion 72. Not only on the lower side, but also on the entire armrest main body supporting portion 72 in the height direction. As a result, the armrest main body 71 can be installed in a stable state at any height with respect to the armrest main body support portion 72.
Further, since the engaging portions (the ridges 772, the front protruding pieces 742, and the rear protruding pieces 752) between the armrest main body 71 and the armrest main body support portion 72 are arranged inside the armrest main body cover portion 714, It is possible to prevent the engaging portion between the armrest main body 71 and the armrest main body supporting portion 72 from being exposed, and there is no risk that a person or an object will come into contact with the engaging portion between the armrest main body 71 and the armrest main body supporting portion 72, which is safe. It is possible to improve not only the design but also the design.
　また、本実施形態では、肘掛け本体支持部７２対する肘掛け本体７１の上下方向の高さ位置を異なる上下方向の複数の位置で固定可能な高さ位置拘束手段７９を有し、この高さ位置拘束手段７９が肘掛け本体カバー部７１４の内部に配置されている。
　このような構成とすることにより、高さ位置拘束手段７９が外部に露出することを防止することができ、高さ位置拘束手段７９に人や物が接触する虞がなく安全性を向上させることができるとともに、意匠性を向上させることができる。 Further, in the present embodiment, the height position restraining means 79 capable of fixing the height position of the armrest main body 71 to the armrest main body supporting portion 72 in the vertical direction at a plurality of different vertical positions is provided. Means 79 are located inside the armrest body cover 714.
With such a configuration, it is possible to prevent the height position restraining means 79 from being exposed to the outside, and there is no possibility that a person or an object will come into contact with the height position restraining means 79, thereby improving safety. It is possible to improve the design.
　また、本実施形態では、肘掛け本体７１の摺動可能範囲よりも上方への移動を規制する下側突出片７７４、摺動可能範囲よりも下方への移動を規制する上側突出片７７３と、を有し、下側突出片７７４および上側突出片７７３は肘掛け本体カバー部７１４と連結されている。
　このような構成とすることにより、肘掛け本体７１の上下方向の移動を規制することができる。そして、下側突出片７７４および上側突出片７７３が肘掛け本体カバー部７１４と連結されていることにより、肘掛け本体７１の上下方向の移動を規制することによって下側突出片７７４および上側突出片７７３に衝撃が生じた場合に、この衝撃を肘掛け本体カバー部７１４も負担することができ、肘掛け本体７１を強固な構造とすることができる。 Further, in the present embodiment, a lower protruding piece 774 that restricts the movement of the armrest main body 71 above the slidable range and an upper protruding piece 773 that restricts the movement below the slidable range are provided. The lower protruding piece 774 and the upper protruding piece 773 are connected to the armrest main body cover portion 714.
With such a configuration, the vertical movement of the armrest main body 71 can be restricted. The lower protruding piece 774 and the upper protruding piece 773 are connected to the armrest main body cover portion 714, so that the vertical movement of the armrest main body 71 is restricted, so that the lower protruding piece 774 and the upper protruding piece 773 are attached. When an impact occurs, the impact can also be borne by the armrest main body cover portion 714, and the armrest main body 71 can have a strong structure.
　肘掛け７は、着座者が肘を掛ける肘掛け本体７１と、椅子１の支持構造体２に支持され肘掛け本体７１が上下方向に昇降可能に取り付けられる肘掛け本体支持部７２と、を有し、肘掛け本体支持部７２は、昇降溝形成部７２３（第１係合部）を有し、肘掛け本体７１は、上下方向に延びて上端部と下端部との間に昇降溝形成部７２３が配されると共に昇降溝形成部７２３に上下方向に摺動可能に係止されるレール部材７７（第２係合部）と、レール部材７７およびこのレール部材７７を係止する昇降溝形成部７２３を覆う肘掛け本体カバー部７１４（カバー部）と、を有する。
　この肘掛け７は、レール部材７７を昇降溝形成部７２３に対して上下方向の複数の位置に固定可能な高さ位置拘束手段７９（高さ位置固定部）を有し、高さ位置拘束手段７９は、肘掛け本体カバー部７１４の内部に配置されている。
　この肘掛け７は、昇降溝形成部７２３がレール部材７７の上記上端部と上記下端部との間に配されたレール部材７７の摺動可能範囲よりも上方への移動を規制する下側突出片７７４（上側規制部）と、レール部材７７の上記摺動可能範囲よりも下方への移動を規制する上側突出片７７３（下側規制部）と、を有し、下側突出片７７４および上側突出片７７３は肘掛け本体カバー部７１４と連結されている。言い換えれば、肘掛け７は、レール部材７７の昇降溝形成部７２３に対する摺動可能範囲よりも上方へのレール部材７７の移動を規制する下側突出片７７４（上側規制部）と、上記摺動可能範囲よりも下方へのレール部材７７の移動を規制する上側突出片７７３（下側規制部）と、を有する。
　背凭れ４は、着座者が背を凭せ掛ける背凭れ本体４１と、肘掛け７と、を有し、肘掛け本体７１が背凭れ本体４１の幅方向の外側に配置されている。
　椅子１は、肘掛け７を有する。 The armrest 7 has an armrest main body 71 on which a seated person rests his / her arm, and an armrest main body support part 72 supported by the support structure 2 of the chair 1 and attached to the armrest main body 71 so as to be vertically movable. The support portion 72 has a lift groove forming portion 723 (first engaging portion), and the armrest main body 71 extends in the vertical direction and the lift groove forming portion 723 is arranged between the upper end portion and the lower end portion. An armrest main body that covers the rail member 77 (second engaging portion) that is slidably locked in the up-and-down groove forming portion 723, the rail member 77, and the up-and-down groove forming portion 723 that locks the rail member 77. And a cover portion 714 (cover portion).
The armrest 7 has height position restraining means 79 (height position fixing portion) capable of fixing the rail member 77 to a plurality of vertical positions with respect to the elevating groove forming portion 723, and the height position restraining means 79. Is arranged inside the armrest main body cover portion 714.
The armrest 7 has a lower protruding piece that restricts the lifting groove forming portion 723 from moving upward beyond the slidable range of the rail member 77 disposed between the upper end portion and the lower end portion of the rail member 77. 774 (upper side restricting portion) and an upper protruding piece 773 (lower side restricting portion) that restricts the movement of the rail member 77 below the slidable range. The lower protruding piece 774 and the upper protruding portion are provided. The piece 773 is connected to the armrest body cover portion 714. In other words, the armrest 7 is slidable with the lower projecting piece 774 (upper side regulating portion) that regulates the movement of the rail member 77 to the upper side than the slidable range of the rail member 77 with respect to the elevating groove forming portion 723. An upper projecting piece 773 (lower restricting portion) that restricts the movement of the rail member 77 below the range.
The backrest 4 has a backrest main body 41 on which a seated person leans his / her back, and an armrest 7, and an armrest main body 71 is arranged outside the backrest main body 41 in the width direction.
The chair 1 has an armrest 7.
　以上、本発明による肘掛け、背凭れおよび椅子の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
　例えば、上記の実施形態では、肘掛け７は背凭れ本体４１の幅方向の外側に配置されているが、背凭れ本体４１の前側など、背凭れ本体４１の幅方向の外側以外に設けられていてもよい。
　また、上記の実施形態では、肘掛け本体支持部７２対する肘掛け本体７１の上下方向の高さ位置を異なる上下方向の複数の位置で固定可能な高さ位置拘束手段７９を有し、この高さ位置拘束手段７９が肘掛け本体カバー部７１４の内部に配置されているが、肘掛け本体７１の肘掛け本体支持部７２対する上下方向の位置を調整する機構は上記以外であってもよく、肘掛け本体カバー部７１４の内部に配置されていなくてもよい。 Although the embodiments of the armrest, backrest and chair according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit thereof.
For example, in the above embodiment, the armrest 7 is arranged outside the backrest main body 41 in the width direction, but it is provided outside the widthwise outside of the backrest main body 41, such as the front side of the backrest main body 41. Good.
Further, in the above-described embodiment, the height position restraining means 79 capable of fixing the height position of the armrest main body 71 to the armrest main body supporting portion 72 in the vertical direction at a plurality of different vertical positions is provided. Although the restraint means 79 is arranged inside the armrest body cover portion 714, the mechanism for adjusting the vertical position of the armrest body 71 relative to the armrest body support portion 72 may be other than the above, and the armrest body cover portion 714. Does not have to be placed inside.
　また、上記の実施形態では、肘掛け本体７１の摺動可能範囲よりも上方への移動を規制する下側突出片７７４、摺動可能範囲よりも下方への移動を規制する上側突出片７７３と、を有し、下側突出片７７４および上側突出片７７３は肘掛け本体カバー部７１４と連結されているが、肘掛け本体７１の摺動可能範囲よりも上方および下方への移動を規制する機構は上記以外であってもよく、肘掛け本体カバー部７１４と連結されていなくてもよい。 Further, in the above-described embodiment, the lower protruding piece 774 that restricts the movement of the armrest main body 71 above the slidable range, the upper protruding piece 773 that restricts the movement below the slidable range, and Although the lower protruding piece 774 and the upper protruding piece 773 are connected to the armrest main body cover portion 714, the mechanism for restricting the movement of the armrest main body 71 above and below the slidable range is other than the above. Or may not be connected to the armrest main body cover portion 714.
　また、上記の実施形態では、肘掛け本体支持部７２は、背凭れ支持部２４に固定されているが、背凭れ支持部２４以外の、例えば背凭れ本体４１に固定されていてもよい。
　また、上記の実施形態では、肘掛け本体支持部７２の前側部材７４が連結部５と連結されることで、肘掛け７が背凭れ支持部２４に固定されている。これに対し、肘掛け本体支持部７２の後側部材７５が連結部５と連結可能に構成されていて、後側部材７５が連結部５と連結されることで、肘掛け７が背凭れ支持部２４に固定されていてもよい。
　また、肘掛け本体支持部７２の前側部材７４または後側部材７５のいずれか一方側が背凭れ支持部２４に一体に設けられていてもよい。また、肘掛け本体支持部７２の前側部材７４または後側部材７５のいずれか一方側が背凭れ本体４１に一体に設けられていてもよい。例えば、肘掛け本体支持部７２の前側部材７４または後側部材７５のいずれか一方側が背凭れ本体４１の外周枠部４２に一体に設けられていてもよい。 In addition, in the above-described embodiment, the armrest main body support portion 72 is fixed to the backrest support portion 24, but it may be fixed to a part other than the backrest support portion 24, for example, the backrest body 41.
Further, in the above-described embodiment, the armrest 7 is fixed to the backrest support 24 by connecting the front member 74 of the armrest main body support 72 to the connecting portion 5. On the other hand, the rear member 75 of the armrest main body support portion 72 is configured to be connectable to the connecting portion 5, and the rear member 75 is connected to the connecting portion 5, so that the armrest 7 supports the backrest supporting portion 24. It may be fixed to.
Further, one of the front side member 74 and the rear side member 75 of the armrest main body support portion 72 may be integrally provided on the backrest support portion 24. Further, one of the front side member 74 and the rear side member 75 of the armrest main body supporting portion 72 may be integrally provided on the backrest main body 41. For example, either the front side member 74 or the rear side member 75 of the armrest main body support portion 72 may be integrally provided on the outer peripheral frame portion 42 of the backrest main body 41.
　本発明は、着座者が肘を掛ける肘掛け、並びにこのような肘掛けを有する背凭れおよび椅子に適用でき、本発明によれば、肘掛け本体支持部に昇降可能に支持された肘掛け本体が、いずれの高さにおいても安定した状態で設置されるとともに、肘掛けの意匠性を向上させることができる。 INDUSTRIAL APPLICABILITY The present invention can be applied to an armrest on which a seated person rests his / her arm, and a backrest and a chair having such an armrest. It can be installed in a stable state even in height, and the design of the armrest can be improved.
　１　椅子
　２　支持構造体
　４　背凭れ
　７　肘掛け
　２４　背凭れ支持部
　４１　背凭れ本体
　７１　肘掛け本体
　７２　肘掛け本体支持部
　７４　前側部材
　７５　後側部材
　７７　レール部材（第２係合部）
　７９　高さ位置拘束手段（高さ位置固定部）
　７１４　肘掛け本体カバー部（カバー部）
　７２３　昇降溝形成部（第１係合部）
　７４４　昇降溝部
　７７２　凸条部
　７７３　上側突出片（下側規制部）
　７７４　下側突出片（上側規制部）
　７８２　内板部 1 Chair 2 Support Structure 4 Backrest 7 Armrest 24 Backrest Support 41 Backrest Main Body 71 Armrest Main Body 72 Armrest Main Body Support 74 Front Member 75 Rear Member 77 Rail Member (Second Engagement Part)
79 Height position restraint means (height position fixing part)
714 Armrest main body cover (cover)
723 Lifting groove forming part (first engaging part)
744 Lifting Groove 772 Protruding Strip 773 Upper Projecting Piece (Lower Regulator)
774 Lower projecting piece (upper regulating part)
782 inner plate

Claims (5)

  1. 　着座者が肘を掛ける肘掛け本体と、
    　椅子の支持構造体に支持され前記肘掛け本体が上下方向に昇降可能に取り付けられる肘掛け本体支持部と、を有する肘掛けにおいて、
    　前記肘掛け本体支持部は、第１係合部を有し、
    　前記肘掛け本体は、
    　　上下方向に延びて上端部と下端部との間に前記第１係合部が配され、前記第１係合部に上下方向に摺動可能に係止される第２係合部と、
    　　前記第２係合部および前記第２係合部を係止する前記第１係合部を覆うカバー部と、を有する肘掛け。     An armrest main body on which a seated person rests his elbow,
    In an armrest having an armrest main body support portion which is supported by a support structure of a chair and which is attached to the armrest main body so as to be vertically movable.
    The armrest main body support portion has a first engagement portion,
    The armrest body,
    A second engaging portion that extends in the vertical direction, the first engaging portion is disposed between an upper end portion and a lower end portion, and the second engaging portion is slidably locked in the first engaging portion in the vertical direction;
    An armrest having: the second engaging portion and a cover portion that covers the first engaging portion that locks the second engaging portion.
  2. 　前記第２係合部を前記第１係合部に対して上下方向の複数の位置に固定可能な高さ位置固定部を有し、
    　前記高さ位置固定部は、前記カバー部の内部に配置されている請求項１に記載の肘掛け。     A height position fixing portion capable of fixing the second engaging portion to a plurality of vertical positions with respect to the first engaging portion,
    The armrest according to claim 1, wherein the height position fixing portion is arranged inside the cover portion.
  3. 　前記第１係合部が前記第２係合部の前記上端部と前記下端部との間に配された前記第２係合部の摺動可能範囲よりも上方への移動を規制する上側規制部と、前記第２係合部の前記摺動可能範囲よりも下方への移動を規制する下側規制部と、を有し、
    　前記上側規制部および前記下側規制部は前記カバー部と連結されている請求項１又は２に記載の肘掛け。     An upper side regulation that regulates the movement of the first engaging portion above the slidable range of the second engaging portion arranged between the upper end portion and the lower end portion of the second engaging portion. And a lower-side restricting portion that restricts a movement of the second engaging portion below the slidable range,
    The armrest according to claim 1 or 2, wherein the upper regulation portion and the lower regulation portion are connected to the cover portion.
  4. 　着座者が背を凭せ掛ける背凭れ本体と、
    　請求項１から３のいずれか一項に記載の肘掛けと、を有し、
    　前記肘掛け本体が前記背凭れ本体の幅方向の外側に配置されている背凭れ。     A backrest body on which a seated person leans his back,
    An armrest according to any one of claims 1 to 3,
    A backrest in which the armrest body is arranged outside the widthwise direction of the backrest body.
  5. 　請求項１から３のいずれか一項に記載の肘掛けを有する椅子。 A chair having an armrest according to any one of claims 1 to 3.
PCT/JP2019/041121 2018-10-19 2019-10-18 Armrest, backrest, and chair WO2020080532A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08196383A (en) * 1995-01-20 1996-08-06 Inoue Assoc:Kk Height adjustment mechanism for armrest or the like of chair
JP2011120934A (en) * 2011-02-07 2011-06-23 Okamura Corp Chair
JP2015020519A (en) * 2013-07-18 2015-02-02 トヨタ紡織株式会社 Vehicle seat

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08196383A (en) * 1995-01-20 1996-08-06 Inoue Assoc:Kk Height adjustment mechanism for armrest or the like of chair
JP2011120934A (en) * 2011-02-07 2011-06-23 Okamura Corp Chair
JP2015020519A (en) * 2013-07-18 2015-02-02 トヨタ紡織株式会社 Vehicle seat

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