WO2013011982A1 - Rocking chair and spring unit used therein - Google Patents

Rocking chair and spring unit used therein Download PDF

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Publication number
WO2013011982A1
WO2013011982A1 PCT/JP2012/068095 JP2012068095W WO2013011982A1 WO 2013011982 A1 WO2013011982 A1 WO 2013011982A1 JP 2012068095 W JP2012068095 W JP 2012068095W WO 2013011982 A1 WO2013011982 A1 WO 2013011982A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
cam
backrest
seat
outer shell
Prior art date
Application number
PCT/JP2012/068095
Other languages
French (fr)
Japanese (ja)
Inventor
昌史 長谷川
光平 和田
伊藤　博之
誠太郎 河本
駿介 近藤
Original Assignee
株式会社イトーキ
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
Priority claimed from JP2011157065A external-priority patent/JP5779021B2/en
Priority claimed from JP2011157063A external-priority patent/JP5779020B2/en
Priority claimed from JP2011250621A external-priority patent/JP5936104B2/en
Application filed by 株式会社イトーキ filed Critical 株式会社イトーキ
Priority to CN201280035232.XA priority Critical patent/CN103747706B/en
Publication of WO2013011982A1 publication Critical patent/WO2013011982A1/en
Priority to US14/155,748 priority patent/US9402478B2/en

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/023—Reclining or easy chairs having independently-adjustable supporting parts the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03238—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A47C1/03279—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs of torsion type
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs

Definitions

  • the present invention relates to a rocking chair whose backrest tilts backward against the spring means, and more particularly to a rocking chair capable of adjusting the resistance of the spring means against the back tilt of the backrest.
  • the present invention further includes a spring unit for use in a rocking chair.
  • the rocking chair has spring means for imparting resistance to the back tilt of the backrest
  • the magnitude of the resistance of the spring means to the back tilt of the backrest that is, the magnitude of the reaction force of the backrest acting on the body during locking.
  • Elasticity adjusting means is provided for changing.
  • the spring means a compression coil spring is often used.
  • the elasticity adjusting device has a stepless method using a rotary screw and a stepped method using a cam or a lever.
  • the mechanism for changing the magnitude of the resistance of the spring means is broadly divided into a system for changing the magnitude of the initial pressurization to the spring means and a system for changing the moment acting on the spring means.
  • Patent Documents 1 and 2 describe that in a configuration in which a compression coil spring is supported by a movable spring receiver, the initial elasticity of the compression coil spring is supported by supporting the movable spring receiver with a circumferential cam and rotating the circumferential cam. Changing power is disclosed.
  • Patent Document 3 in a configuration in which a compression coil spring is fitted into two telescopic spring receivers, one spring receiver is rotatably connected to a base, and the other spring receiver receives a locking load. It is disclosed that the compression coil spring is rotated by moving the spring receiver with an adjusting screw with a knob.
  • the locking spring means is loaded even when the person is not leaning against the backrest. That is, a pretension (preliminary load) is applied to the spring means. This is because if the pretension is not applied, the backrest suddenly leans back greatly without resistance due to the leaning of the person, and it is dangerous. Further, in the case of a synchro chair in which the seat tilts backward in conjunction with the back tilt of the backrest, the pre-tensioning of the locking spring also plays a role of holding the seat so that it does not tilt backward only by sitting.
  • a peripheral cam as disclosed in Patent Documents 1 and 2 as an elastic force adjusting means (reaction force adjusting means) of the spring means has an advantage that the elastic force at the time of locking can be adjusted in one touch.
  • the coil spring when rotating the circumferential cam, the coil spring must be compressed once when the point of application of the load is shifted to the adjacent cam surface, so a large knob is required to rotate the circumferential cam lightly. I have to do it.
  • the present invention has been made in view of such a current situation, and an object thereof is to provide an improved elasticity adjusting mechanism.
  • many improvements are disclosed in the present application, and providing these improvements can be an object of the invention.
  • the chair to which the present invention is directed includes, as a basic structure, a seat, a backrest that can be tilted backward, a locking spring means that provides resistance to the back tilt of the backrest, and a resistance of the spring means against the back tilt of the backrest. And a resilience adjusting member that changes the degree of.
  • the present invention can be developed in various ways based on the basic configuration.
  • the first invention is a high-level concept.
  • the elasticity adjusting member is a cam that can be rotated while a person is seated, and a rocking load accompanying a back tilt of the backrest is applied to the spring means. By changing the acting position with the cam, the degree of resistance of the spring means is adjusted by changing the moment applied to the spring means.
  • the first invention can be developed in various ways.
  • the second invention in the second invention, it has a base provided at the upper end of the leg and a back frame connected to the base so as to be able to tilt backward, and sandwiches the tilt center of the back frame.
  • a pressing portion that contacts the spring means is provided, while the spring means is a compression coil spring wound around a long axial center in the front-rear direction.
  • the spring means has an arcuate concave shape in a side view so as to allow rotation of the spring means.
  • a development example of the second invention is the third invention.
  • the compression coil spring is built in a spring holder that expands and contracts in the front-rear direction, while the cam is a peripheral cam and an outer peripheral surface.
  • the cam is a peripheral cam and an outer peripheral surface.
  • a preferred development example of the third invention is the fourth invention.
  • the spring holder is fitted in two slidably forward and backward directions so as to support the spring from one end and the other end.
  • the two spring receivers are held so that they cannot be removed when the compression coil spring is pre-compressed.
  • the second invention can also be developed as the fifth invention.
  • separation prevention means for holding the spring means in close contact with the cam is provided, and the separation prevention means has an elastic portion that allows the cam to rotate. .
  • the present invention also includes a spring unit.
  • a sixth invention relating to this spring unit includes a compression coil spring and two spring receivers that support the compression coil spring from one end and the other end thereof, and the two spring receivers are extendable. And the compression coil spring is pre-compressed and held in an inseparable state, and one of the two spring receivers is provided with a load receiving portion on which a rocking load of the chair acts, and the other Is provided with a connecting portion that is rotatably connected to a constituent member of the chair.
  • the present invention adjusts the elasticity of the locking by changing the moment acting on the locking spring means, and does not change the initial load (pretension) applied to the locking spring. It is possible to prevent or remarkably suppress the elastic restoring force of the spring means from acting as a resistance. For this reason, even if it is a compact operation member, a cam can be rotated easily. That is, the elastic adjustment of the locking spring means can be easily performed with a single operation with a compact operation member.
  • the surface on which the locking moment is applied to the compression coil spring (the load application surface) has a linear posture in a side view. Therefore, when the compression coil spring is rotated, the compression coil spring The overall length changes and the initial elastic force changes. To be precise, when the compression coil spring is rotated so that its load application point moves away from the tilting fulcrum of the backrest, the compression coil spring is stretched and the initial elastic force is weakened. When the point is rotated so as to approach the tilting fulcrum of the backrest, the compression coil spring contracts and the initial elastic force becomes stronger. Therefore, the expansion and contraction of the compression coil spring acts so as to cancel out the change in moment.
  • the pressing portion of the spine frame has a concave arc shape facing forward when viewed from the side, so that it can be rotated without changing the length of the compression coil spring. For this reason, the elastic force of locking can be changed to an appropriate degree, and the elastic force of the compression coil spring can be prevented or suppressed more accurately.
  • the side view shape of the cam receiving portion is an arc shape having a radius of curvature around the rotation fulcrum of the compression coil spring.
  • the compression coil spring is built in the telescopic spring holder as in the third aspect of the invention, the posture change of the compression coil spring can be realized more easily.
  • the constituent members of the spring holder are held so as not to be detached as in the fourth and sixth inventions, not only can the labor of member management be reduced, but also the assembly of the chair becomes easy, and Since the elastic force of the compression coil spring can be accurately prevented or suppressed from acting on the cam receiving portion, the operability of the elasticity adjustment can be further improved.
  • the compression coil spring is pre-tensioned even in the non-locking state.
  • the compression coil spring and the spring receiver and the like are each assembled as separate parts after being manufactured. For this reason, since the movable spring receiver was attached in a state where the compression coil spring was contracted, it took time to manage the parts and the assembly of the chair was troublesome, but the fourth invention of the present application and In the sixth invention, since the compression coil spring is built in the spring holder in a pre-tensioned state, it is possible to reduce the labor of component management and to assemble the chair very easily.
  • the function of the cam can be secured while ensuring the reversibility.
  • the elastic member is provided in the separation preventing means as in the fifth aspect, the elastic member is once deformed when moving to the adjacent cam surface, so that a click feeling can be secured when the cam surface is transferred. . For this reason, it is preferable that a person can accurately grasp the state in which the elasticity is adjusted.
  • FIG. 1 It is a figure which shows the external appearance of the chair which concerns on 1st Embodiment
  • (A) is the perspective view seen from the front
  • (B) is the perspective view seen from back
  • (C) is a side view.
  • (A) is the isolation
  • (B) is a vertical side view of a back frame. It is a separation perspective view of the whole chair.
  • (A) is the perspective view which looked at the support mechanism part from the front lower part
  • (B) is the perspective view which looked at the support mechanism part from the horizontal lower part. It is a separation perspective view of a support mechanism part.
  • (A) is the isolation
  • (B) is the isolation
  • (C) is a partial expansion perspective view of a seat outer shell. It is a top view of the support mechanism part centering on the base.
  • (A) is a partially separated perspective view of the support mechanism part centered on the base
  • (B) is a cross-sectional view taken along line VIIIA-VIIIA in FIG. 7, and (C) is a cross-sectional view taken along line VIIIC-VIIIC in FIG.
  • (A) is a vertical side view of the support mechanism
  • (B) is a separated perspective view of the push shaft and the spring contact.
  • (A) is sectional drawing for description seen in XI-XI view of FIG. 7, (B) (C) is the elements on larger scale of (A).
  • (A) is a separated perspective view of the elasticity adjusting unit and the base, and (B) is a partially separated perspective view of the elasticity adjusting member.
  • (A) is a separated perspective view of an elastic adjustment member
  • (B) is a separated perspective view of a spring holder
  • (C) is a perspective view of a spring unit. It is a separation perspective view of an elastic adjustment member.
  • (A) is a separated perspective view of an intermediate
  • (B) is a separated perspective view of a support mechanism part.
  • FIG. 6 is a schematic diagram showing third to fifth embodiments. It is a separation perspective view of a seat.
  • (A) is the top view of the principal part
  • (B) is the cross-sectional perspective view which looked at a part of (A) from the side.
  • FIG. 20A is a cross-sectional view taken along the line IA-IA of FIG. 20A
  • FIG. 20B is a cross-sectional perspective view of FIG. 20A viewed from the BB direction
  • FIG. 20C is a cross-sectional view of FIG. It is a cross-sectional perspective view seen from the -C viewing direction
  • 20A is a cross-sectional view taken along the line IIA-IIA in FIG. 20A
  • FIG. 20B is a cross-sectional view taken along the line IIB-IIB in FIG. 20A is a sectional perspective view of FIG. 20A viewed from the A′-A ′ viewing direction
  • FIG. 20A is a sectional perspective view of FIG.
  • FIG. 20A viewed from the B′-B ′ viewing direction
  • FIG. ) Is a cross-sectional perspective view of FIG. 20A viewed from the C′-C ′ direction.
  • A) is the perspective view which looked at the part by which the operation lever for seat adjustment was mounted
  • (B) is the isolation
  • A) is a separated perspective view of the seat adjusting operation lever and the slide outer shell
  • (B) is a separated perspective view of the seat adjusting operation lever
  • (C) is a top view of the portion where the seat adjusting operation lever is mounted. It is the perspective view seen from.
  • FIG. 2 is a cross-sectional view taken along line XXIX-XXIX in FIG.
  • (A) is a longitudinal side view of the main part
  • (B) is a sectional view taken along the line BB of (A).
  • (A) is a cross-sectional perspective view showing the initial angle adjusting device
  • (B) is a cross-sectional view taken along line XB-XB in FIG. It is the isolation
  • (A) and (B) are separate perspective views.
  • (A) is a perspective view which shows the fitting state of a surrounding surface cam
  • (B) is a separate perspective view of an operation tool and a surrounding surface cam.
  • (A) is a longitudinal front view of the main part
  • (B) is a sectional view taken along the line BB of (A).
  • FIGS. 1 to 14 the first embodiment shown in FIGS. 1 to 14 will be described.
  • the words “front and rear” and “left and right” are used to specify the direction, but the words on the front and rear and right and left are based on the person who is seated.
  • the front view direction is the direction facing the seated person, and therefore the left and right in the front view are opposite to the left and right viewed from the seated person.
  • the seat 3 has a resin seat inner shell (seat plate) 7 and a seat cushion material 8 arranged on the upper surface thereof.
  • the seat cushion material 8 is an upper skin material such as a cloth. Covered from.
  • the seat outer shell 6 is composed of a fixed outer shell 9 fixed to the intermediate metal fitting 5 and a slide outer shell 10 protruding in front thereof, and the slide outer shell 10 is front and rear with respect to the fixed outer shell 9. It is slidably attached.
  • a certain range on the front side of the seat inner shell 7 is a deformation allowing portion 7c that easily bends and deforms downward in a side view, and the front end portion of the deformation allowing portion 7c slides. It is connected to the front end of the outer shell 10. For this reason, when the slide outer shell 10 is slid back and forth, the deformation allowing portion 7c of the seat inner shell 7 extends forward or winds downward. Thereby, the front-rear length of the seat 3 can be adjusted.
  • the seat outer shell 6 can be viewed as a part of the seat, and it can also be considered that the seat is constituted by the seat 3 and the seat outer shell 6. A large number of horizontally elongated slits are formed in the deformation allowing portion 7c. Details of the structure of the seat 3 will be described later.
  • the backrest 4 has a resin-made back inner shell (back plate) 12 and a cushion material 13 disposed on the front surface thereof.
  • the cushion material 13 and the back inner shell 12 are It is completely covered with a bag-shaped skin material.
  • the backrest 4 forms a lumbar support that hits the lumbar spine of the person who is seated.
  • the backrest 4 has a shape in which a longitudinal side view is curved in a forwardly convex shape so that a portion corresponding to the lumbar vertebra of the seated person is in front.
  • the backrest 4 and the seat 3 can be of any form / structure.
  • a first back frame 14 is connected to the base 2 so as to be tiltable rearwardly, and a second back frame 15 located behind the first back frame 14. Is fixed, and the backrest 4 is attached to the second back frame 15.
  • the first back frame 14 is made of resin or aluminum die-cast, and as shown in FIGS. 3 and 5, a base portion 14 a that extends in the left-right direction behind the base 2, and an outer side of the base 2 from both left and right sides of the base portion 14 a.
  • the arm portion 14b extends forward at a position, and the front end portions of the left and right arm portions 14b are connected to the base 2 by a horizontally elongated first shaft 16. Accordingly, the backrest 4 tilts around the axis of the first shaft 16.
  • the base 2 has a bearing hole 17 into which the first shaft 16 is fitted (see FIGS. 3 and 5).
  • the front portion of the left and right arm portions 14 b in the first back frame 14 is a crank portion 14 c entering the left and right inner sides, and the first shaft 16 penetrates the base end portion of the crank portion 14 c. ing. Further, the front ends of the left and right crank portions 14c are integrally connected by a laterally long push shaft 18.
  • the push shaft 18 is covered from below by a lower cover 19 (see FIG. 5). In the left and right side plates of the lower cover 19, elongated holes 20 that allow the push shaft 18 to rotate are opened upward.
  • the second back frame 15 is made of resin or aluminum die-cast, and has a base portion 15a extending in the left-right direction and two square left and right back posts 15b provided at the rear end of the base portion 15a. Is connected to the head portion 15c of the back column 15b so as to be able to rotate back and forth around the height position of the lumbar support portion.
  • the backrest 4 can change the rotation posture in a plurality of stages by the initial angle adjustment mechanism. This point will be described later.
  • the back frames 14 and 14 and the backrest 4 tilt backward about the first shaft 16. Therefore, as shown in FIGS. 2B, 3, and 5, a resilience adjusting unit 23 is provided inside the base 2 to provide resistance to the rearward tilting of the first back frame 14.
  • the chair of the present embodiment is a synchro-type chair in which the seat 3 is retracted in conjunction with the backward tilting of the backrest 4, and the front part of the intermediate bracket 5 is elastic as can be estimated from FIG.
  • the rear part of the intermediate metal fitting 5 is connected to the front part of the adjustment unit 23 (or the front part of the base 2) so as to be able to move backward, and the bracket part 24 projecting upward on the first back frame 14 is provided with a horizontally elongated second shaft 25. It is connected with.
  • a lock gas cylinder 26 is provided as a lock device for holding the backrest 4 at an arbitrary rearward tilt angle. It is arranged in a longitudinal posture.
  • the bottom of the rear half of the base 2 is raised and raised, and a groove-type base bracket 30 having a bottom plate and left and right side plates 30a is welded to the raised portion. It is fixed.
  • a bush 31 having an upper and lower opening is welded to the bottom plate of the base bracket 30 and the bottom plate of the base 2, and the upper end of the leg column (gas cylinder) 1 is fitted to the bush 31 from below.
  • the left and right side plates 30a of the base bracket 30 pass through a horizontally long third shaft 32, and the lock gas cylinder 26 is supported by the third shaft 32 so as not to move forward.
  • the third shaft 32 is attached to the left and right side plates 30 a of the base bracket 30.
  • the intermediate metal fitting 5 has a shape that is almost a square in plan view, and has an upper plate 5a and left and right side plates 5b.
  • the second shaft 25 penetrates the side plate 5b.
  • the side plate 5 b of the intermediate fitting 5 is located inside the bracket portion 24 in the first back frame 14.
  • the fixed outer shell 9 is formed with a recess 33 that fits into the intermediate metal fitting 5 completely.
  • a pair of left and right forward stoppers 34 is provided at the front end of the upper surface of the intermediate metal fitting 5, while a tunnel-shaped receiving portion 35 into which the forward stopper 34 is fitted from behind is provided at the front end portion of the recess 33 in the fixed outer shell 9.
  • a left and right horizontally long and rectangular lock hole 36 is formed in the rear end portion of the upper plate 5 a in the intermediate metal 5, while a lock that fits in the lock hole 36 in the rear end portion of the recess 33 in the fixed outer shell 9.
  • the claw 37 is protruded downward.
  • the lock claw 37 is fitted into the lock hole 36 after being elastically deformed. Thereby, the fixed outer shell 9 is attached to the intermediate metal fitting 5 so as not to be detached.
  • the elasticity adjusting unit 23 has a pair of left and right support brackets 38 that fit into the front portion of the base 2.
  • the support bracket 38 is made of a plate material and is disposed on the inner side of the inner surface of the base 2, and at the front portion of the support bracket 38, a blade portion 39 that overlaps the outward flange 29 of the base 2 from above is provided to project sideways.
  • the outward flange 29 of the base 2 is formed with an overhanging portion 29a that overlaps the blade portion 39 of the support bracket 38, and a stopper piece 40 that holds the blade portion 39 so as not to be laterally displaced protrudes upward from the overhanging portion 29a.
  • a resin-made slider receiver 41 is fitted to the protruding portion 29a of the base 2 and the blade portion 39 of the support bracket 38 from the left and right outer sides, and as shown in FIG.
  • the overhanging portion 29 a is fastened together with screws 42.
  • the intermediate fitting 5 is provided with a laterally projecting portion 43 that overlaps the slider receiver 41 from above, and as shown in FIG. 8C, an outer end portion of the laterally projecting portion 43 is provided.
  • a resin slider 44 mounted on the lower surface is in contact with the slider receiver 41 from above (see also FIG. 4A).
  • the upper surface of the outer end portion 41a that supports the slider 44 in the slider receiver 41 has a curved shape that is convex upward in a side view. For this reason, the intermediate metal fitting 5 (the seat 3) moves smoothly during the locking and moves backward while tilting. As shown in FIG. 4 (A), a wall portion 43a that surrounds the slider receiver 41 from the left and right sides and from behind is projected downward from the laterally projecting portion 43 of the intermediate fitting 5.
  • the upper portion of the outer end of the slider receiver 41 is a protruding portion 41a projecting to the left and right sides, and as shown in FIG. A stopper piece 45 (see also FIG. 15A) positioned below the protrusion 41a of the slider receiver 41 is bent. Therefore, the front part of the intermediate metal fitting 5 is held so as not to be able to move upward. Therefore, even if the front part of the seat 3 is lifted up, the intermediate metal fitting 5 does not come off the base 2.
  • the separation preventing function between the intermediate metal fitting 5 and the base 2 is provided by other members, the description thereof is omitted because it is not related to the present application.
  • the elasticity adjusting unit 23 is rotatably attached to the pair of left and right support brackets 38, the spring unit 50 disposed between the left and right support brackets 38, and the left and right support brackets 38.
  • the operation shaft 51 and a substantially L-shaped posture holding body 52 mounted on the left and right side portions of the spring unit 50 are provided.
  • the posture holding body 52 is an example of the separation preventing means described in the claims.
  • the spring unit 50 includes a cylindrical first spring receiver 53 that is substantially square and opened rearward, a compression coil spring 54 disposed inside the first spring receiver 53, and a first spring receiver.
  • the second spring receiver 55 is slidably fitted to the slidable member 53.
  • the first spring receiver 53 and the second spring receiver 55 constitute the support described in the claims. Since the support body of this embodiment has a hollow case structure, it can be said that the spring case is constituted by both the second spring receivers 53 and 54. Naturally, the spring holding body composed of both spring receivers 53 and 55 expands and contracts.
  • the second spring receiver 55 has a substantially square shape. Therefore, the inside of the first spring receiver 53 is also substantially in the shape of a square. Further, guide ribs 56 are provided on the left and right side surfaces of the second spring receiver 55, while guide grooves 57 into which the guide protrusions 56 are formed are formed on the inner surface of the first spring receiver 53. Since the first spring receiver 53 does not move and the second spring receiver 55 moves when the expansion / contraction direction is used as a reference, the first spring receiver 53 is called a fixed spring receiver and the second spring receiver 55 is called a movable spring receiver. Is also possible.
  • the first spring receiver 53 and the second spring receiver 55 have left and right horizontally elongated pins 58 as an example of a slip prevention means, and the pin insertion holes 59 of the first spring receiver 53 are long holes in the front and rear direction. Therefore, the second spring receiver 55 is allowed to slide back and forth (the expansion and contraction of the spring unit 50).
  • a support shaft 60 projecting left and right is provided at the front end of the first spring receiver 53, and the support shaft 60 is fitted into a hole 61 provided in the support bracket 38 via a bush. Therefore, in this embodiment, the support shaft 60 is a connecting portion described in the claims. Since the support bracket 38 is fixed to the base 2, the spring unit 50 rotates up and down around the support shaft 60.
  • the pusher 62 is attached to the push shaft 18 provided at the front end of the first back frame 14, and the second spring receiver 55 is pushed by the pusher 62. ing. Therefore, in this embodiment, the front-end
  • the pusher 62 is an example of a pushing portion described in the claims.
  • the rear end portion of the second spring receiver 55 has a mountain shape that protrudes backward in a side view, while the front surface of the pusher 62 is an arc surface 62a having a radius of curvature centering on the support shaft 60 in a side view.
  • the tip of the second spring receiver 55 has a mountain shape (wedge shape) in a side view so as to come into contact with the pusher 62.
  • a positioning member 63 having a front plate 63 a, a bottom plate 63 b, and left and right side plates 63 c is fixed to the push shaft 18, and the pusher 62 is attached to the positioning member 63.
  • a recess 64 that fits from above is formed. Therefore, the pusher 62 is held so that it cannot be displaced left and right and cannot rotate.
  • a longitudinal groove is formed on the front surface of the pusher 62 in order to prevent the second spring receiver 55 from coming into contact with one side. It is also possible to attach a lining material having excellent wear resistance to the front surface of the pusher 62.
  • the engagement hole 65 is provided in the bottom plate 63b of the positioning member 63, while the pusher 62 is formed with an engagement claw 66 that fits into the engagement hole 65.
  • the positioning member 63 is held so as not to be detached from the push shaft 18.
  • On the rear surface of the pusher 62 an auxiliary groove 62b opened rearward is formed over the entire length of the left and right.
  • the auxiliary groove 62b is for temporarily holding the first back frame 14 by fitting the front back support piece 2a formed in the base 2 when the first back frame 14 is attached.
  • the positioning member 63 may be integrally formed with the push shaft 18, or the push shaft 18 may be manufactured by molding (die casting or casting), and the push portion may be provided integrally therewith.
  • a pair of left and right guide shafts 67 project from the left and right outwards in a portion of the first spring receiver 53 behind the support shaft 60, while the support bracket 38 includes a guide shaft.
  • An arcuate guide hole 68 into which 67 is movably fitted is formed. Thereby, the rotation stroke of the spring unit 50 is regulated.
  • a pair of left and right peripheral cams 70 are fitted on the operation shaft 51, while the peripheral cams 70 are provided on both left and right sides of the first spring receiver 53 constituting the spring unit 50.
  • a cam receiving portion 71 is provided in contact with the outer peripheral surface of the projection.
  • the circumferential cam 70 is formed with first to fifth five cam surfaces 70a to 70e in order of decreasing distances e1 to e5 from the rotation axis. Therefore, when the circumferential cam 70 is rotated by the operation shaft 51, the spring unit 50 changes to five postures, and the interval (span) from the first shaft 16 to the second spring receiver 55 changes. As a result, the resistance against rocking can be adjusted in five stages.
  • the left and right circumferential cams 70 are connected to each other via a cylindrical portion and are integrally formed with one cam member 73.
  • the operating shaft 51 and the circumferential cam are inserted. 70 and rotate together.
  • the operation shaft 51 is rotatably held by the left and right support brackets 38.
  • one end portion of the operation shaft 51 protrudes to the outside of the base 2, and a knob 74 is attached thereto.
  • a retaining clip 75 is attached to the other end of the operation shaft 51.
  • the base 2 is provided with a recess 76 into which the operation shaft 51 enters. For this reason, the height of the operating shaft 51 can be made as low as possible.
  • a posture holding cam portion 77 is integrally formed inside the circumferential cam 70.
  • cam surfaces 77a to 77e whose distance from the axis is opposite to the cam surfaces 70a to 70e of the circumferential cam 70 are formed.
  • the posture maintaining peripheral cam portion 77 is set to be slightly smaller than the peripheral cam 70.
  • the posture holding body 52 is made of a metal plate and is rotatably fitted to the support shaft 60 of the first spring receiver 53.
  • the posture holding body 52 has an upper abutting portion 52a that abuts the posture holding cam portion 77 obliquely from above and a lower support portion 52b that extends rearward so as to be positioned below the cam receiving portion 71 of the posture holding body 52.
  • a support piece 52c protrudes outward from the lower end of the lower support portion 52b, and the three rubbers 78 are supported by the support piece 52c.
  • the rubber 78 is an example of an elastic portion described in claims, and a hole 79 for positioning the rubber 78 is formed in the cam receiving portion 71.
  • the number of rubbers 78 may be one or more. It is also possible to use a coil spring instead of the rubber 78. Alternatively, it is possible to integrally provide an elastic portion as a part of the posture holding body 52.
  • the circumferential cam 70 and the cam receiving portion 71 are sandwiched from above and below by the posture holding body 52, and therefore the spring unit 50 and the circumferential cam 70 are held inseparably. Therefore, the spring unit 50 rotates regardless of which direction the circumferential cam 70 is rotated.
  • the circumferential cam 70 is displayed.
  • the interval E1 from the axis of the operation shaft 51 to the upper surface of the cam receiving portion 71 changes and the operation is performed.
  • the distance E2 from the axis of the shaft 51 to the posture maintaining peripheral surface cam portion 77 also changes.
  • the lower surface of the cam receiving portion 71 and the posture holding are set.
  • the distance E3 between the body 52 and the support piece 52c is also kept substantially constant. That is, when the spring unit 50 is rotated by the rotation of the operation shaft 51, the posture holding body 52 is also rotated in the rotation direction of the spring unit 50. Therefore, the dimension of E3 is independent of the posture of the spring unit 50. It is held almost constant.
  • the locking device has the locking gas cylinder 26 as described above.
  • the locking gas cylinder 26 is a commercially available product, and has a cylindrical body 26a and a rod 26b slidably fitted on the cylindrical body 26a.
  • the rod 26 b protrudes rearward, a support member 80 made of resin or the like is attached to the tip (rear end) of the rod 26 b, and the support member 80 is fitted on the third shaft 32.
  • a mounting groove 81 into which the third shaft 32 is fitted is formed in a state of opening substantially upward. Accordingly, as shown in FIG. 15 (B), the locking gas cylinder 26 is fitted into the third shaft 32 after the mounting groove 81 is raised so as to open substantially downward, and then the cylinder By changing the posture so that the body 26a is directed toward the front, it can be attached to the third shaft 32 in a one-touch manner.
  • the lock gas cylinder 26 is attached in a state where the intermediate fitting 5 is attached to the base 2. Therefore, the base 2 has a hole 82 into which the lock gas cylinder 26 can be fitted from above.
  • the support member 80 is held by the base bracket 30 so as not to drop when the locking gas cylinder 26 is set in a predetermined posture. Therefore, the lock gas cylinder 26 is held so as not to be detached.
  • a lever piece 84 for operating the push valve 83 of the locking gas cylinder 26 is fitted into the support member 80 from below.
  • a support shaft portion 85 is formed at the lower end of the lever piece 84, and the support shaft portion 85 is fitted in a bearing groove 86 provided in the support member 80.
  • one end portion of the cable conduit 87 is fixed to the front end of the upper end of the support member 80, and a ball 89 fixed to one end of the wire 88 inserted through the cable conduit 87 is connected to the upper end of the lever piece 84. It is hung on the part.
  • the lever piece 84 is formed with an engagement groove 90 that can be moved upward after the ball 89 is fitted.
  • the other end of the cable conduit 87 is connected to the left side or the right side of the fixed outer shell 9, and the other end of the wire 88 is connected to a manual operation lever (not shown).
  • the operation lever is selectively held between a locked posture and a free posture.
  • FIG. 9A the operation lever is in a locked posture, and in this state, the backrest 4 is held so as not to tilt.
  • the lever piece 84 is turned so that the upper end of the lever piece 84 is moved forward, thereby pushing the push valve 83 and the locking gas cylinder 26 is telescopic. It becomes a free state. Therefore, the backrest 4 can be tilted freely.
  • a horizontally long fourth shaft 91 is attached to the front end portion of the locking gas cylinder 26.
  • the fourth shaft 91 is attached to a pin receiving member 92 having left and right bottom plates, left and right side plates 92a, and a flap piece 92b. It is fitted and held from above. That is, the flap piece 92b of the pin receiving member 92 protrudes outward from the upper end of the side plate 92a, and the fourth shaft 91 is fitted from above into the pin receiving groove 93 formed by opening the flap piece 92b and the side plate 92a. Yes.
  • the flap piece 92b of the pin receiving member 92 is fixed to the lower surface of the intermediate fitting 5 with screws 94.
  • the fourth shaft 91 is held so that it cannot be pulled out upward and left and right by a stopper 95 inserted and attached to the intermediate bracket 5 from the front.
  • the stopper 95 is made of resin and has left and right feet 95a extending rearward from the front plate.
  • the left and right foot bodies 95a are formed in an L shape in rear view so as to surround the left and right ends of the fourth shaft 91 from the outside and the upper side. Due to 95a, the fourth shaft 91 is held so as not to be able to come out upward and in the left-right direction.
  • a front plate 5c is formed at the front end of the intermediate fitting 5, and a mounting hole 97 through which the foot body 95a of the stopper 95 passes is provided in the front plate 5c.
  • the foot body 95 a overlaps the lower surface of the intermediate metal fitting 5. For this reason, even if an upward external force is applied to the fourth shaft 91, it does not bend and deform.
  • two left and right engaging claws 98 project rearwardly at the lower end of the front plate of the stopper 95.
  • the front end (rear end) of the engaging claw 98 has an upward hook shape, and the engaging claw 98 is hooked on the front plate 5c of the intermediate metal fitting 5 from below. Needless to say, the engaging claw 98 is deformed against its elasticity and then caught on the front plate 5 c of the intermediate metal fitting 5. For this reason, the stopper 95 is held so as not to be detached.
  • the gas cylinder is composed of a cylindrical body and a piston rod (plunger) fitted thereto, and the lock is released by pushing a push valve protruding from one end of the piston rod.
  • the base end of the cylindrical body is pivotally connected to the base or the like with a pin, while the tip of the piston rod is fixed to the backrest side with a nut or the like. The work of was troublesome.
  • the locking device solves this problem.
  • One-touch type in which the support member 80 is fitted into the third shaft 32 and the fourth shaft 91 is fitted into the pin receiving groove 93 of the flap piece 92b and the side plate 92a. With this operation, the lock gas cylinder 26 can be easily attached.
  • the pusher 62 can be integrally formed with the push shaft 18. However, if the pusher 62 is configured separately from the push shaft 18 as in this embodiment, the pusher 62 is different from the first back frame 14. There is an advantage that the function of the pusher 62 can be improved as a material, and an advantage that it can be easily replaced if the pusher 62 is worn. More specifically, for example, the first back frame 14 and the push shaft 18 are integrally formed from an aluminum die cast, and the pusher 62 is a resin excellent in strength and wear resistance (for example, nylon-based resin or polyacetal). It is also a preferable aspect to manufacture by. In addition, it is possible to eliminate the need for the lining material by forming the pusher 62 with a material excellent in strength and wear resistance.
  • the third shaft 32 that is a support shaft of the locking gas cylinder 26 is disposed at a height position between the first shaft 16 and the second shaft 25.
  • the line of action of the load acting on the locking gas cylinder 26 along with locking is the axis of the locking gas cylinder 26.
  • the posture is close to. For this reason, the capability (elastic restoring force) of the locking gas cylinder 26 can be fully exhibited as a resistance against the backward tilting of the backrest 4. Further, the durability of the lock gas cylinder 26 can be improved.
  • the spring unit 50, the support bracket 38, and the operation shaft 51 with the cam member 73 are configured as one elastic adjustment unit 23, the labor of storage and assembly can be suppressed, and an assembly error can be reduced. There is an advantage that it can contribute to the improvement of accuracy by eliminating the variation.
  • assembly of a support mechanism part is performed in the following procedure. That is, the pusher 62 is fitted in and attached to the push shaft 18 in advance, the first back frame 14 is set on the base 2, the elasticity adjusting unit 23 is set on the base 2, and the slider 44 is attached and fixed. Insert the front part of the intermediate metal part 5 into the slider 44 from behind, connect the intermediate metal part 5 and the first back frame 14 with the second shaft 25, set the locking gas cylinder 26, and attach the stopper 95 to the intermediate metal part 5. The procedure is to do.
  • the pin receiving member 92 is fixed to the intermediate metal fitting 5 in advance. In this embodiment, since there are few screwing places, there exists an advantage which can assemble a chair efficiently and with high precision.
  • FIGS. 16 and 17 a second embodiment shown in FIGS. 16 and 17 will be described.
  • This embodiment is a modification of the elasticity adjusting unit 23, and the major difference from the first embodiment is that the configuration of the posture holding means for holding the circumferential cam 70 and the spring unit 50 in an overlapped state is different. Is a point.
  • the posture holding body 52 is made of resin, and the left and right posture holding bodies 52 are connected by the joint 100, and the left and right posture holding body 52 is connected to the cylinder as an example of the elastic portion described in the claims.
  • a spring portion 101 that comes into contact with the guide protrusion 71a protruding from the cam receiving portion 71 of the member 51 is provided integrally.
  • the spring portion 101 is formed in a mountain shape that is thin and has a convex shape upward in a side view. Therefore, the rotation of the circumferential cam 70 is allowed by the bending and deformation of the spring portion 101.
  • the spring part 101 is integrally formed with the attitude
  • the joint 100 is used to integrally connect the left and right posture holding bodies 52, and is formed in a forward convex mountain shape in plan view. For this reason, the space
  • the left and right posture holding bodies 52 may be separated or connected by separate joints without being integrally formed.
  • the support bracket 38 is provided with a corner portion 38a projecting forward, and a bearing hole 102 into which the first shaft 16 is fitted is formed in the corner portion 38a.
  • the support bracket 38 When the spring unit 50 is pushed by the pusher 62, the spring unit 50 may tend to rotate upward. For this reason, the support bracket 38 may also tend to float at its rear part. If it fits in the 1 axis
  • the arcuate guide hole 68 is formed in the support bracket 38 as the rotation stroke restricting means of the spring unit 50.
  • the rotation stroke is restricted by the circumferential cam 70. Yes. That is, with reference to FIG. 13B as well, when a corner portion between the first cam surface 70a and the fifth cam surface 70e is referred to as an end corner for convenience, the height of the first cam surface 70a ( The difference between the height from the rotation axis) and the height of the end corner is set to a size larger than the size of E3, and the difference between the height of the fifth cam surface 70e and the height of the end corner is larger than the size of E3.
  • the peripheral cam 70 can be moved from the first cam surface 70a to the fifth cam surface 70e or from the fifth cam surface 70e to the first cam surface 70a.
  • the end corner portion of this is held by the cam receiving portion 71 so that it cannot be rotated.
  • a stroke restricting means such as a long hole may be provided separately.
  • FIG. 18 schematically shows another embodiment.
  • the third embodiment shown in FIG. 5A is applied to a configuration in which the moment from the pushing portion 103 is changed by sliding the spring unit 50 in a direction perpendicular to the axis. That is, in this embodiment, the elasticity is adjusted by sliding the entire spring unit 50 sideways with the circumferential cam 70.
  • the spring unit 50 is fixed in position and posture, and simply expands and contracts. Between the second spring receiver 55 and the pressing portion 103, an intermediate rotating body 104 that hits the second spring receiver 55 and a slide body 105 that transmits the load of the pressing portion 103 to the intermediate rotating body 104 are arranged. The moment is changed by sliding the slide body 105 in a direction perpendicular to the axis of the spring unit 50. Although not shown, the slide body 105 is moved by the circumferential cam.
  • the present invention can also be applied to such a type. In this embodiment, a plate spring, a torsion bar, or the like can be used as the locking spring means.
  • the fifth embodiment shown in FIG. 18C is another example of a spring holding structure.
  • a cylindrical body 107 is provided on a fixed spring receiver 106 that is rotatably connected to the base 2, while a movable spring receiver 108 that receives a load of a pushing portion (not shown) slides on the cylindrical body 107.
  • An inner shaft 109 that fits freely is provided, and a compression coil spring 110 is fitted to the cylinder body 107 and the inner shaft 109 from the outside. Therefore, the compression coil spring 110 is exposed.
  • the posture of the spring unit 50 is changed by pressing the movable spring receiver 108 with the circumferential cam. Note that the fixed spring receiver 106 and the movable spring receiver 108 are held so as not to be detached by a retaining means such as a bolt.
  • the application target is not limited to a movable swivel chair, but can also be applied to a fixed chair such as a theater chair.
  • a fixed chair such as a theater chair.
  • Various forms can be adopted as necessary for the structural member such as the base.
  • the cam is not necessarily limited to the circumferential cam, and an end face cam, a grooved cam, or the like can also be employed.
  • the spring unit As a connecting portion of the spring unit, it is possible to provide a pin hole in one of the first spring receiver and the second spring receiver.
  • expansion and contraction of the first spring receiver and the second spring receiver is an essential condition, but the spring may be exposed to the outside.
  • the front part of the seat is formed as a deformation-permitting part, the front end of the deformation-permitting part is fixed to a horizontally long front bar, and the deformation-permitting part is rolled up or extended by moving the front bar back and forth.
  • Side bars extending rearward are fixed to the left and right ends of the front bar, and the side bars are supported by a receiving member so as to be slidable back and forth.
  • a person grasps the front end of the seat with his / her hand and pushes / pulls forward / backward, or moves the sidebar back and forth with a separate operation tool.
  • the body pressure is applied to the sidebar, making it difficult to adjust the front and back length while sitting, so the waist was lifted when changing the front and back length of the seat. Therefore, there is a problem that adjustment of the length of the seat (depth adjustment) is troublesome.
  • the present application provides a chair that improves such a current situation.
  • the chair disclosed in the present application includes a seat and a chair, and the seat includes a seat inner shell having a cushion and a seat outer shell that supports the seat inner shell from below. It has a basic configuration in which the front and rear lengths can be adjusted by forming the front portion of the seat inner shell as a deformation allowing portion that can be wound downward.
  • the seat outer shell includes a fixed outer shell that forms at least a rear half of the fixed outer shell, and a slide outer shell that has a portion protruding in front of the fixed outer shell.
  • the slide outer shell is attached to the fixed outer shell so as to be movable back and forth, and by connecting the front end portion of the seat inner shell to the front end portion of the slide outer shell, the front portion of the seat inner shell is It makes it possible to get caught down.
  • the slide outer shell has a planar spread so that the seat inner shell can be supported over a wide range, and the seat inner body is mainly supported by the stationary outer shell while the body pressure of the seated person is supported by the seat outer shell.
  • the downward pressing force of the shell is set so as not to be applied to the slide outer shell.
  • the longitudinal length of the seat changes by moving the slide outer back and forth, but since the fixed outer shell constitutes at least the rear half, for example, a normal sitting state with the back against the backrest Thus, most of the body pressure of the seated person can be supported by the fixed outer shell. Since the slide outer shell is not pressed from above by the seat inner shell while the body pressure of the seated person is mainly supported by the fixed outer shell, a load is applied to the slide outer shell when a person normally sits down. There is little or no effect, and as a result, the longitudinal length of the seat can be adjusted while seated. For this reason, it is excellent in operability and user-friendly.
  • the slide outer shell has a wide area, so that even if the body pressure of the seated person acts on the front part of the seat, the seat inner shell does not deform excessively. Firmly supported. For this reason, it is excellent in support strength.
  • the seat inner shell sinks due to the body pressure of the seated person and hits the slide outer shell, the seat inner shell is supported by a wide area by the slide outer shell, so the seat inner shell is greatly deformed locally. Therefore, there is no problem that gives a feeling of pushing up to a person's thigh, so that the sitting comfort is excellent. In other words, the longitudinal length of the seat can be adjusted without sacrificing strength or sitting comfort.
  • the seat inner shell 7 is a molded product made of a resin such as PP.
  • a resin such as PP.
  • the rear support portion 7b positioned behind the main support portion 7a and the above-described deformation allowing portion 7c positioned in front of the main support portion 7a. Roughly speaking, the main support portion 7a occupies a little less than half of the longitudinal length, and the rear support portion 7b and the deformation allowance portion 7c occupy a range of about a quarter or more.
  • a number of intermediate slits 112 are formed in the main support portion 7 a of the seat inner shell 7. Further, only the left and right side portions of the main support portion 7a and the rear support portion 7b are connected to each other, and left and right laterally elongated grooves 113 are formed therebetween. For this reason, the main support portion 7a is allowed to extend downward and deform with the body pressure of the seated person.
  • horizontally long front slits 114 are formed in three rows in the left-right direction and in multiple rows (multi-stage) in the front-rear direction. 7c is allowed to be wound downward from a posture extending linearly in a side view.
  • a laterally inverted U-shaped bridge portion 115 is formed at the left and right intermediate portion and the left and right end portions of the deformation allowing portion 7c, and the strip-like portion divided forward and backward across the front slit 114 is a bridge portion. Connected at 115. Due to the presence of the inverted U-shaped bridge portion 115, the deformation-permitting portion 7c can be greatly extended in the front-rear direction, so that it can be reliably entangled and deformed without resistance.
  • the fixed outer shell 9 and the slide outer shell 10 constituting the seat outer shell 6 are molded products made of a resin such as PP.
  • the front end of the fixed outer shell 9 extends to the rear portion of the deformation allowing portion 7c in the seat inner shell 7 (note that the slit is omitted in FIG. 21A).
  • a large number of ribs are formed on the upper surface of the fixed outer shell 9 in order to increase rigidity.
  • the fixed outer shell 9 is formed with a hole 116 that allows the main support portion 7a of the seat inner shell 7 to sink greatly.
  • the slide outer shell 10 includes a base portion 10 a having substantially the same lateral width as the fixed outer shell 9 and a planar spread, and arm portions 10 b protruding rearward from the left and right side portions of the base portion 10 a.
  • a base portion 10 a having substantially the same lateral width as the fixed outer shell 9 and a planar spread
  • arm portions 10 b protruding rearward from the left and right side portions of the base portion 10 a.
  • the base 10a of the slide outer shell 10 is basically plate-shaped (may be lattice-shaped), and reinforcing ribs are formed on the upper surface so as to extend vertically and horizontally. Then, as shown in FIG. 19 and FIG. 22 (A) and the like, a plurality of first guide protrusions 117 having a head-view T-shape projecting from the front end portion of the fixed outer shell 9 are provided in a protruding manner.
  • a longitudinal guide elongated hole 118 is formed in which the first guide protrusion 117 cannot be removed and fits forward and backward.
  • the first guide protrusion 117 and the guide slot 118 constitute first guide means.
  • Four first guide projections 117 and four guide long holes 118 are formed in a jumping manner in the left-right direction, but the number and position can be arbitrarily set.
  • each guide slot 118 is a wide portion 118 a into which the head of the first guide protrusion 117 is fitted and detached.
  • the guide long hole 118 is fitted into the first guide protrusion 117 from the position of the wide width portion 118a, and then the slide outer shell 10 is slid rearward, so that the base portion 10a of the slide outer shell 10 is held so as not to be detached.
  • the arm portion 10b of the slide outer shell 10 is formed with a crank-shaped guide groove 119 having a crank shape that opens downward and upward in a front sectional view.
  • the fixed outer shell 9 is integrally provided with a substantially inverted L-shaped second guide projection 120 that fits in the guide groove 119 so as not to be removed.
  • the second guide protrusion 120 and the guide groove 119 constitute an example of second guide means.
  • the guide groove 119 forms a support portion 119a that protrudes left and right by shifting the downward opening position and the upward opening position to the left and right, while the second guide protrusion 120 is positioned on the support portion 119a.
  • the inward flange portion 120a is formed.
  • the rear end portion of the guide groove 119 is a wide portion 119b for allowing the second guide projection 120 to be fitted.
  • a narrow convex rail portion 121 is formed at the lower end of the arm portion 10b, while the fixed outer shell 9 has a concave rail portion 122 into which the convex rail portion 121 is slidably fitted.
  • the left and right positions of the slide outer shell 10 are regulated by the rail portions 121 and 122 being fitted to each other.
  • the convex rail portion 121 extends near the front end of the fixed outer shell 9, and the concave rail portion 122 extends near the front end of the slide outer shell 10.
  • rail-shaped side support portions (side protrusions) 123 that are long in the front and rear directions are formed in a portion near the left and right side edges of the fixed outer shell 9 and substantially in the latter half.
  • the support rib 124 of the seat inner shell 7 is placed on the side support portion 123.
  • a horizontal step portion 125 is formed outside the support rib 124 in the main support portion 7 a of the seat inner shell 7, and slides below the step portion 125.
  • the arm portion 10 b of the outer shell 10 is disposed, and an inward stopper piece 126 is formed on the inner wall portion of the step portion 125.
  • the stopper piece 126 is surrounded from three sides by a punched hole 127 opened up and down.
  • a deterrence piece 128 that covers the stopper piece 126 from above is integrally provided on the side support portion 123 of the fixed outer shell 9. That is, the left and right end portions of the main support portion 7a in the seat inner shell 7 are held so as not to move inwardly. Therefore, the main support portion 7a is deformed so as to sink downward due to the load of the seated person. Further, since the left and right side portions of the main support portion 7a are held so as not to be lowered by the side support portions 123, the arm portion 10b of the slide outer shell 10 is the main support portion 7a of the seat inner shell 7 even if a person is seated. It will not be pushed downward. Accordingly, the arm portion 10b of the slide outer shell 10 can easily slide back and forth in the seated state.
  • the punching hole 127 protrudes behind the stopper piece 126. Therefore, the restraining piece 128 is overlapped with the fixing hole 127 by placing the seat inner shell 7 slightly in front of the predetermined position and then overlapping the fixed outer shell 9. Can be fitted into the rear. In this state, when the seat inner shell 7 is shifted backward, the restraining piece 128 is positioned on the stopper piece 126.
  • support pieces 129 projecting inwardly toward the arm portion 10b of the slide outer shell 10 are separated in the front-rear direction at the left and right end portions of the main support portion 7a in the seat inner shell 7. Are formed.
  • the support piece 129 is for attaching a skin material.
  • the left and right rear portions of the fixed outer shell 9 are provided with hook-shaped rear engagement claws 130 formed with a bifurcated upper portion, while the rear support portion 7b of the seat inner shell 7 has A rear engagement hole 131 is formed to be engaged with and engaged with the rear engagement claw 130 from above. This rear engagement hole 131 is also engaged with the rear engagement claw 130 by shifting the seat inner shell 7 once to the fixed outer shell 9 and then shifting it backward.
  • a center locking piece 132 is provided at the left and right intermediate portions of the rear support portion 7b of the seat inner shell 7 so as to protrude downward with the front end as a free end. 9, a center receiving portion 133 into which the center locking piece 132 is fitted so as not to move forward is recessed.
  • the center locking piece 132 is surrounded by a slit on three sides except for the root, and therefore the center locking piece 132 can be rotated up and down with the root as a fulcrum.
  • a side engaging portion 134 having a square shape in plan view is formed on the left and right outer portions of the center receiving portion 133 in the fixed outer shell 9, and the seat inner shell 7 is formed on the side engaging portion 134.
  • Side engagement holes 135 provided in the rear support portion 7b are fitted. As a result, the backward movement of the seat shell 7 is restricted.
  • the connecting structure of the front end portion of the seat inner shell 7 is shown in FIG. That is, the support shafts 137 are integrally formed via the left and right downward bracket pieces 136 at the two left and right sides of the seat inner shell 7 with respect to the center line, while the front end of the slide outer shell 10 is formed. Are integrally provided with a bearing portion 138 into which the support shaft 137 is fitted from above. The support shaft 137 and the bearing portion 138 can rotate relative to each other.
  • the front-end position (depth of a front end) can be adjusted by changing the front-end position of the seat 3.
  • the number of arrangement positions of the support shaft 137 and the bearing portion 138 is not limited to two positions on the left and right sides, and the number and arrangement positions can be arbitrarily set. Further, the support shaft 138 can be provided on the slide outer shell 10 and the bearing portion 138 can be provided on the deformation allowing portion of the seat inner shell 6, and other connecting means may be employed.
  • the operating device includes a finger contact lever 140 that is mounted on the right side of the slide outer shell 10 so as to freely move back and forth, and a lock member 141 that slides left and right as the finger contact lever 140 moves back and forth. And a spring (compression coil spring) 142 that urges the lock member 141 to the locked posture.
  • the bottom surfaces of the left and right side portions of the slide outer shell 10 are inclined so as to be lowered toward the inside, and the bottom surface has a flat recess on the inclined bottom surface.
  • 143 is formed, and the finger rest lever 140 is disposed in the recess 143 so as to be movable back and forth.
  • the finger rest lever 140 has an upper plate 140a that overlaps the bottom surface of the recess 143 and a knob 140b that protrudes downward from the upper plate 140a, and is exposed on the slide outer shell 10 on the upper plate 140a.
  • a front-view T-shaped engagement protrusion 144 is integrally formed.
  • the slide outer shell 10 is provided with a longitudinal attachment hole 145 into which the engagement protrusion 144 cannot be removed. At the front end of the mounting hole 145, a wide portion 145a into which the engaging projection 144 can be freely fitted and removed is formed.
  • the lock member 141 has a left and right longitudinal rod shape, and is slidably fitted in a left and right longitudinal guide groove 146 provided on the lower surface of the slide outer shell 10.
  • the guide groove 146 and the recess 143 are integrally continuous.
  • the guide groove 146 is formed in a state where the convex rail portion 121 is divided.
  • the outer end of the lock member 141 facing the finger contact lever 140 is a U-shaped contact portion 141a as viewed from the bottom, while the finger contact lever 140 includes a lock member.
  • a recess 147 is formed to cover the abutting portion 141a of 141 from below, and the inner side surface of the recess 147 is formed with two front and rear inclined surfaces 147a that are inclined so that the interval is widened.
  • a groove 168 into which the spring 142 is fitted is formed on the upper surface of the lock member 141, and one end of the spring 142 is in contact with the inner side surface 146 a of the guide groove 146. Therefore, the lock member 141 is urged outward (in a direction toward the finger contact lever 140). Since the recess 147 of the finger rest lever 140 is V-shaped, when no external force is applied to the finger rest lever 140, the lock member 141 is retracted outward and the contact portion 141a is the recess 147. It is fitted in a deep position and is held in a stable state. On the other hand, when the finger contact lever 140 is slid forward or backward, the lock member 141 moves forward inward by the guide action of the inclined surface 147a.
  • a stopper protrusion 149 that protrudes downward toward the fixed outer shell 9 is integrally provided at the inner end of the lock member 141.
  • the fixed outer shell 9 is provided with a stopper receiving portion 150 into which the stopper protrusion 149 is fitted and removed when the lock member 141 moves left and right.
  • the stopper receiving part 150 is configured by jumping inward ribs on longitudinal longitudinal ribs 151 in the longitudinal direction, and in this embodiment, five stopper receiving parts 150 are formed side by side. Therefore, the longitudinal length of the seat 3 can be adjusted in five stages.
  • finger sliding protrusions 152 having the same shape as the sliding finger rest lever 140 are integrally formed at positions symmetrical to the sliding finger rest lever 140 in the slide outer shell 10. Yes. For this reason, the front-rear adjustment of the seat 3 can be performed smoothly without being twisted. It is also possible to provide the sliding finger rest lever 140 on both the left and right sides of the slide outer shell 10. When the slide-type finger rest lever 140 is provided on the left and right, the lock member 141 can be provided on the left and right. The lock member 141 is provided only on one side, and one slide-type finger rest lever 140 is a dummy. It is also possible.
  • the left and right sides of the main support portion 7a of the seat inner shell 7 are held on the side support portions 123, so that the body pressure of the seated person is applied to the arm portion 10a of the slide outer shell 10. Since it does not act at all or hardly, it can be easily performed while the seat 3 is being seated. Although it is possible that the thigh of the seated person hits against the deformation allowable portion 7c of the seat inner shell 7, the deformation allowable portion 7c is merely stretched, entangled or deformed and does not move back and forth. Therefore, the fact that the thigh of the seated person is in contact with the seat inner shell 7 does not serve as resistance for the longitudinal adjustment of the seat 3.
  • the lock member 141 is detached from the stopper receiving portion 150 and the slide outer shell 10 can be moved back and forth as it is when the finger resting lever 140 is moved in any direction. Accordingly, when the person adjusts the depth of the seat 3, the lock is released by moving the finger rest lever 58 in a way that the slide outer shell 10 is desired to be moved. Can be done. Therefore, operability is good.
  • the slide outer shell 10 since the slide outer shell 10 overlaps the fixed outer shell 9 from above, for example, even when body pressure is strongly applied to the front portion of the seat 3, the slide outer shell 10 is in close contact with the fixed outer shell 9. Act on. That is, as the body pressure is increased, the slide outer shell 10 tends to be integrated with the seat outer shell 9. For this reason, the slide outer shell 10 is not separated from the fixed outer shell 9 by human body pressure. Therefore, it is excellent in support strength and support stability.
  • the arm portion 10b of the slide outer shell 10 is disposed outside the side support portion 123, it is possible to accurately prevent the arm portion 10b from being pushed by the seat inner shell 7. That is, since the main support portion 7a of the seat inner shell 7 is placed on the side support portion 123, the portion of the seat inner shell 7 located outside the side support portion 123 tends to float upward due to the body pressure of the seated person. Therefore, the slide outer shell 10 can be prevented from being pressed by the seat inner shell 7 and the slide outer shell 10 can be moved back and forth easily.
  • the initial posture of the backrest is changed to suit the user's preference, but it is not preferable that the contact with the body changes by changing the initial posture.
  • the body support position shifts back and forth or the body contact position shifts up and down by changing the initial posture of the backrest.
  • the lumbar support function is accurately set. It is preferable that the initial posture can be changed while being held.
  • Japanese Patent Publication No. 47-49543 and Japanese Patent Application Laid-Open No. 2002-142897 Japanese Patent Publication No. 2010-516433 disclose that the backrest is tilted around the pivot point of the back frame to change the initial posture.
  • the backrest moves back and forth as a whole with adjustment of the initial posture, which may cause the body to feel pushed up, and conversely, the support function of the body may decrease.
  • the adjustment mechanism disclosed in the present application is to improve such a current situation, making it possible to change the initial posture of the backrest while appropriately maintaining the support function of the body, and considering the operability of the posture change. Yes.
  • the chair disclosed in the present application has a seat and a backrest disposed behind the seat, and the backrest is attached to a back frame extending backward from below the seat, and the backrest is a seated person.
  • the lumbar support part has a lumbar support part that protrudes from the rear in a side sectional view and supports the lumbar part from behind, and the back frame is configured so that the backrest rotates around a position at a height position of the lumbar support part in a side view.
  • an initial angle adjustment device that changes the side view posture of the backrest is provided on the back frame or the backrest so that it can be operated while a person is seated.
  • the “back frame or backrest” includes a case where it is provided on either one and a case where it is provided on both.
  • the initial posture (initial angle) is changed by rotating the backrest around the lumbar support portion
  • the front and rear positions of the lumbar support portion are greatly changed by changing the initial posture. For this reason, there is no problem that a feeling of pushing up to the body or a support function is lowered by changing the initial posture. That is, the initial posture of the backrest can be adjusted according to the user's preference while appropriately securing the lumbar support function.
  • the initial angle adjustment device can be operated while a person is seated, the person can adjust the posture while trying to feel the body and is user-friendly.
  • the backrest 4 has a lumbar support portion 156 against which a seated person's waist hits. Therefore, the backrest 4 protrudes forward in a side view and a longitudinal side view. It is the shape of. To be precise, the back inner shell 12 is curved so that the lumbar support portion 156 is located in the foremost position when viewed in a longitudinal side view.
  • the back inner shell 12 is gently bent in a concave shape in a plan view, but the degree of bending is the largest in the lumbar support portion 156, and the degree of bending decreases as it goes up, and is flat at the upper end. It is a close form.
  • the backrest 4 is set so that the lateral width is the largest at the lumbar support portion 156 and the lateral width decreases as it moves away from the lumbar support portion 156 upward and downward. Therefore, the backrest 4 (back inner shell 12) has a substantially hexagonal shape in front view. Since the lumbar support portion 156 is close to the lower portion of the back inner shell 12, the backrest 4 is precisely in the form of a swelled hexagonal shape, and the left and right ends of the lumbar support portion 156 are laterally sideways when viewed from the front. It has the shape of a protruding mountain.
  • pillar 15b is provided in the right-and-left end part of the lumbar support part 156 in the back inner shell 12.
  • FIG. The side connecting portion 157 protrudes forward from the periphery.
  • a fist-shaped head portion 15c that opens forward is formed at the upper end of the back column 15b in the second back frame 15, and a bearing portion that opens forward is formed on the head portion 15c.
  • 158 is integrally formed.
  • a boss portion 159 that fits into the bearing portion 158 is formed integrally with the side coupling portion 157 of the back inner shell 12, and the side coupling portion 157 of the back inner shell 12 is formed into a back column by the fitting of both. It is connected to the head 15c of 15b so that it cannot be removed forward.
  • the boss portion 159 is integrally connected to a rib 160 provided on the outer side and a regulation plate 161 provided on the inner side.
  • the bearing portion 158 has a constricted portion, while the boss portion 159 has a cross-sectional shape in which a circle is crushed.
  • the boss portion While 159 is set to have a substantially horizontal posture, the opening direction of the bearing portion 158 is set to open obliquely upward with respect to the horizontal.
  • the boss portion 159 can be fitted into the bearing portion 158 by making the backrest 4 tilt backward with respect to a predetermined posture, and when the lower end of the back inner shell 12 is connected to the second back frame 15, the backrest 4, the boss 159 is held so as not to be detached from the bearing 158 even if a forward external force is applied to the bearing 4. Therefore, the backrest 4 can be easily attached.
  • a load receiving portion 162 having an arc surface having a curvature much larger than the radius of the boss portion 159 is formed in a portion inside the bearing portion 158 of the head portion 15c of the back column 15b.
  • the side connecting portion 157 of the back inner shell 12 is integrally provided with an arc-shaped load application portion 163 that fits in the load receiving portion 162. Since the load contact portion 163 contacts the load receiving portion 162 in a wide area (surface contact), the back inner shell 12 is stably supported by the left and right back struts 15b without being obstructed from front-rear rotation. It is supported by.
  • a groove 164 is formed between the bearing portion 158 and the load receiving portion 162 in the head portion 15c of the back column 15b, and the regulation plate 161 of the back inner shell 12 is securely fitted in the groove 164 so that it cannot be displaced from side to side. waiting.
  • the back inner shell 12 is held so as not to be laterally displaced by the fitting of the groove 164 and the regulating plate 161. Therefore, a backward load acts on the lumbar support portion 156 so that the side connecting portion 157 faces inward. Even if pulled, the side connecting portion 157 does not move inward. For this reason, the mounting strength is high.
  • the bottom surface of the groove 164 and the outer periphery of the regulating plate 161 are formed in an arc shape having a curvature around the axis of the boss portion 159 in a side view, and thus the back inner shell 12 rotates around the axis of the boss portion 159. Is allowed.
  • the boss portion 159 and the bearing portion 158 prevent the detachment in the front-rear direction, so that the boss portion 159 does not have other functions (support of load on the back, prevention of left-right displacement). Is loosely fitted to the bearing portion 158 with a slight clearance between its outer peripheral surface and the inner peripheral surface of the bearing portion 158, and the boss portion 159 is larger than the lateral width dimension of the bearing portion 158.
  • the rib plate 160 is prevented from hitting the side surface of the bearing portion 158. Further, the rear end surface of the regulating plate 161 is set so as not to hit the bottom surface of the groove 164 in the back column 15b.
  • a lower connecting portion 166 that protrudes forward is provided at the left and right middle portion of the lower end portion of the back inner shell 12, and the lower connecting portion 166 opens downward.
  • a center groove 167 is formed, and a pin hole 168 is vacant across the center groove 167.
  • upper and lower ribs 169 and 170 connected to the lower connecting portion 166 are provided on the right side of the lower connecting portion 166 at the lower end portion of the back inner shell 12, and an operation tool (slide) is provided between the upper and lower ribs 169 and 170.
  • Type lever) 171 is slidably mounted to the left and right.
  • the lower connecting portion 166 and the operation tool 171 are components of the initial angle adjusting device 155.
  • the operation tool 171 is provided with a finger hook portion 171a that can be grasped by a person.
  • the operation tool 171 is integrally formed with a pin-shaped lock pin 172 that fits into the pin hole 168 of the lower connecting portion 166. Therefore, when the operation tool 171 is slid left and right, the lock pin 172 can be projected and retracted in the center groove 166 of the lower connecting portion 166.
  • the lock pin 172 is an example of a stopper.
  • the upper rib 169 is provided with a claw 173 that holds the operation tool 171 so as not to be detached from the back inner shell 12.
  • the operation tool 171 is provided with a spring placement space 174 that opens toward the back inner shell 12 and a stroke restriction space 175.
  • the spring disposing space 174 is located on the lock pin 172 side
  • the stroke restricting space 175 is located on the finger hook portion 171 side.
  • the back inner shell 12 is provided with a spring receiving protrusion 176 that enters the spring arrangement space 174 and a stroke restriction protrusion 177 that enters the stroke restriction space 175, and the spring receiving protrusion 176 and the spring arrangement space 175.
  • a compression coil spring 178 is disposed between the inner surface 174ee of the place 174.
  • the operation tool 171 is urged so that the lock pin 172 fits into the lower connecting portion 166 and becomes free (so that the lock position is maintained).
  • the spring 178 is arranged in the spring arrangement space 174 by being pushed in from a window hole 179 provided on the front surface of the operation tool 171.
  • the restriction of the retracted position when the operation tool 171 is pulled outward by hand is performed by bringing the inner surface of the stroke restriction space 175 into contact with the stroke restriction protrusion 180.
  • the forward position when the operating tool 171 is pushed by a spring may be regulated by applying the inner surface of the spring placement space 174 to the stroke regulating projection 180, or the end of the operating tool 171 may be You may carry out by contacting to the side surface of the lower connection part 166.
  • a rear wall 15d is formed at the rear end of the base portion 15a in the second back frame 15, and 15a 'is formed in the center groove 167 of the lower connecting portion 166 in the seat inner shell 12.
  • a block-shaped lock body 181 fitted from below is provided, and three lock holes 182 into which the lock pins of the operation tool 171 are fitted are formed in the lock body 181. Therefore, the lock body 181 is also a component of the initial angle adjusting device 155.
  • the three lock holes 182 exist on an arc centered on the rotation fulcrum of the back inner shell 12, and the initial posture of the backrest 4 is obtained by selectively fitting the lock pins into any of the lock holes 182. Can be changed in three stages. Needless to say, the number of lock holes 182 is not limited to three, but may be two or four or more.
  • the lock hole 182 is an example of a lock portion.
  • the lock body 181 is made of resin and is configured separately from the second back frame 15, and is fitted into the base portion 15 a of the second back frame 15 from below. For this reason, for example, as shown in FIG. 27, the base portion 15a of the second back frame 15 has a hole 183 into which the lock body 181 is fitted from below, and a center guard portion 184 that supports the lock body 181 from behind.
  • the center guard portion 184 is provided with a forward opening groove 185 into which the lock body 181 is fitted.
  • the lock body 181 is provided with a front wall 181a that restricts the lower end of the back inner shell 12 from moving forward greatly.
  • a recess 188 into which the lock body 181 enters is formed on the lower surface of the second back frame 15, and a lower flange 181 b provided on the lock body 181 is overlaid on the bottom surface of the recess 188.
  • the support claw 189 is provided in the inner surface of the recess 188, and the lower flange 181b gets over the support claw 189 from below, so that the lock body 181 is held so as not to drop.
  • the lock body 181 can also be provided integrally with the second back frame 15.
  • a restricting shaft (not shown) is provided at the lower end of the back inner shell 12 by attaching a restricting body 15 f to a receiving bracket 15 e provided at the rear end of the second back frame 15.
  • the inner back shell 12 is held so as not to rotate. Details are omitted.
  • the lower end of the backrest 4 is located below the seating surface, and therefore the initial angle adjusting device 155 is also disposed below the seating surface. For this reason, the initial angle adjusting device 155 does not touch the body. Further, since the seated person can reach the back and operate the operation tool 171, the initial angle can be easily adjusted.
  • FIGS. 32 to 35 a pair of left and right bearing ribs 190 are provided as shown in FIG. 32, and the circumferential cam 191 is rotatably held by the left and right bearing ribs 190 via the operation tool 171, while the lower end of the back inner shell 12.
  • the box is integrally provided with a lower connecting portion 192 having a box-like shape and opening downward, which surrounds the circumferential cam 191.
  • the operation tool 171 is a rotary type.
  • bearing cylinder portions 193 are integrally formed at both left and right ends of the circumferential cam 191, while the left and right cylinders provided on the circumferential cam 191 are formed on the inner side surface of the bearing rib 190.
  • a vertically long slot 194 into which the portion 193 is fitted is formed.
  • the square portion 171a of the operation tool 171 penetrates the cylindrical portion 194 of the circumferential cam 191.
  • a pair of protrusions 195 are formed at the base of the square portion 171a of the operation tool 171.
  • a pair of notches 196 into which the projections 195 are fitted are formed in one cylindrical portion 193 of the circumferential cam 191. For this reason, the integrity of the circumferential cam 191 and the operation tool 171 is enhanced.
  • a small diameter portion 197 is formed at the tip of the operation tool 171, and the small diameter portion 197 is rotatably fitted in a bearing hole 198 provided in the other bearing rib 190.
  • a pair of stopper pieces 199 projecting in a direction perpendicular to the shaft center is provided at the tip of the small diameter portion 197 of the operation tool 171, while the stopper piece 199 cannot be removed from the outer surface of the other bearing rib 190.
  • a stepped portion 200 is formed.
  • the bearing hole 198 of the other bearing rib 190 is a long hole in the front and rear direction. Therefore, the stopper piece 179 is fitted sideways into the bearing hole 198 and the stopper piece 199 is fitted into the bearing hole 198.
  • the insertion of the operation tool 171 is performed after the circumferential cam 191 is set between the left and right bearing ribs 190.
  • the protruding direction 83 of the protrusion 77 and the protruding direction 84 of the stopper piece 81 are orthogonal to each other.
  • a rib 171 b for displaying the posture of the backrest 5 is provided at the proximal end of the grip of the operation tool 171.
  • the circumferential cam 191 is fitted in a procedure in which the rotational axis is fitted between the left and right bearing ribs 190 in a posture inclined with respect to the horizontal, and then returned to the horizontal posture. Since the long groove 194 is long in the vertical direction, the left and right cylindrical portions 75 can be fitted into the left and right long grooves 76 by tilting the circumferential cam 191 in a front view, and when the posture is returned so that the rotation axis is horizontal, The face cam 191 is held so as not to move back and forth.
  • a long hole 201 for inserting the operation tool is opened downward in the lower connecting portion 192 of the back inner shell 12.
  • the front end portion of the operation tool 171 located between the left and right bearing ribs 190 is a prism portion 171b, and the circumferential cam 191 cannot be rotated relative to the prism portion 171b (that is, rotates together with the operation tool 171).
  • the circumferential cam 191 has one center cam portion 204 and a pair of left and right side cam portions 205 located on both the left and right sides thereof.
  • the center cam portion 204 and the side cam portion 205 have outer peripheral surfaces as cam surfaces, the front inner surface of the lower connecting portion 192 is formed as a front restricting surface 192a with which the center cam portion 204 abuts, and the rear inner surface of the lower connecting portion 192 is formed. It forms a rear regulating surface 192b with which the side cam portion 205 abuts.
  • First to third cam surfaces 204a to 63c having different heights from the shaft center are formed on the outer periphery of the center cam portion 204, and the first to third cam surfaces 204a to 63c having different heights from the shaft center are also formed on the outer periphery of the side cam portion 205.
  • Third cam surfaces 205a to 205c are formed.
  • the lower connecting portion 192 opens downward as described above, but the front-rear distance between the front restriction surface 192a and the rear restriction surface 192b is set to increase as it goes downward.
  • the first cam surface 204a of the center cam portion 204 is in contact with the front restricting surface 192a
  • the first cam surface 205a of the side cam portion 205 is in contact with the rear restricting surface 192b.
  • the second cam surface 204b of the cam portion 204 is in contact with the front restriction surface 192a
  • the second cam surface 205b of the side cam portion 205 is in contact with the rear restriction surface 192b
  • the third cam surface 204c of the center cam portion 204 is contacted. Is in contact with the front regulating surface 192a
  • the third cam surface 205c of the side cam portion 205 is in contact with the rear regulating surface 192b.
  • the initial angle of the backrest 4 can be adjusted in three stages by rotating the operation tool 171 and the backrest 4 is held so that it cannot be rattled back and forth.
  • the surrounding surface cam 191 can be rotated by elastically deforming the lower connection part 192.
  • the left and right side plates of the lower connecting portion 192 are provided with a long hole 201 into which the operation tool 171 is loosely fitted in order to allow the lower connecting portion 192 to rotate.
  • an elastic piece 202 having a lower end as a free end is integrally formed on the front portion of the bearing rib 190 so as to be engaged with the elastic piece 202.
  • the holes 203 are provided, the cam surfaces 204a, 204b, and 204c of the center cam portion 204 of the circumferential cam 191 are provided with protrusions 206 that fit into the engagement holes 203, respectively.
  • the user can grasp at intervals that the circumferential cam 191 has been rotated to a predetermined state. That is, the operation tool 171 can be accurately rotated with a click feeling.
  • the initial angle adjustment device can be embodied in various ways.
  • the operation tool is not limited to a slide type or a rotary type, and a rotary type or the like can be adopted. It is also possible to adopt a configuration in which an operation tool with a push button is provided at the lower end of the backrest and the lean is rotated even if the operation tool is moved back and forth while holding the unlocked state by pushing the push button.
  • a cam is used for the initial angle adjusting device, various cams such as an end face cam can be employed. It is also possible to adjust the initial angle of the backrest steplessly by providing a screw type handle in the initial angle adjusting device. It is also possible to employ a lock mechanism other than a pin or cam.
  • the invention of the present application and each invention disclosed in the present application can be embodied in a chair. Therefore, it can be used industrially.

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  • General Health & Medical Sciences (AREA)
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Abstract

The chair is provided with a backrest and the backrest tilts backward via a first back frame (14) that is connected to a base (2). When the backrest is tilted backward, the first back frame (14) rotates around a first axis (16), which then applies a load on a spring unit (50) via a pusher (62). The spring unit (50) comprises a tubular first spring mount (53), a compression coil spring (54) housed therein, and a second spring mount (55) that is fitted into the first spring mount (53) with the front end exposed. The second spring mount (55) is pressed by the pusher (62). When the spring unit (50) rotates around a spindle (60), the operating point of the load changes, and the moment acting on the spring unit changes. The position of the spring unit (50) changes as a result of the rotation of a radial cam (70).

Description

ロッキング椅子及びこれに使用するばねユニットRocking chair and spring unit used therefor
　本願発明は、背もたれがばね手段に抗して後傾動するロッキング椅子に関し、より詳しくは、背もたれの後傾動に対するばね手段の抵抗の大きさを調節できるロッキング椅子に関する。更に本願発明は、ロッキング椅子に使用するばねユニットも含んでいる。 The present invention relates to a rocking chair whose backrest tilts backward against the spring means, and more particularly to a rocking chair capable of adjusting the resistance of the spring means against the back tilt of the backrest. The present invention further includes a spring unit for use in a rocking chair.
　ロッキング椅子は背もたれの後傾動に抵抗を付与するばね手段を有しているが、一般に、背もたれの後傾動に対するばね手段の抵抗の大きさ（すなわち、ロッキングに際して身体に作用する背もたれの反力の大きさ）を変える弾力調節手段を設けている。ばね手段としては圧縮コイルばねを使用することが多い。他方、弾力調節装置は回転式ねじを使用した無段階方式と、カムやレバーを使用した段階方式とがある。 Although the rocking chair has spring means for imparting resistance to the back tilt of the backrest, in general, the magnitude of the resistance of the spring means to the back tilt of the backrest (that is, the magnitude of the reaction force of the backrest acting on the body during locking). (3) Elasticity adjusting means is provided for changing. As the spring means, a compression coil spring is often used. On the other hand, the elasticity adjusting device has a stepless method using a rotary screw and a stepped method using a cam or a lever.
　ばね手段の抵抗の大きさを変える機構としては、ばね手段に対する初期加圧の大きさを変える方式と、ばね手段に作用するモーメントを変える方式とに大別される。前者の方式として特許文献１，２には、圧縮コイルばねを可動ばね受けで支持した構成において、可動ばね受けを周面カムで支持し、周面カムを回転させることで圧縮コイルばねの初期弾性力を変えることが開示されている。 The mechanism for changing the magnitude of the resistance of the spring means is broadly divided into a system for changing the magnitude of the initial pressurization to the spring means and a system for changing the moment acting on the spring means. As the former method, Patent Documents 1 and 2 describe that in a configuration in which a compression coil spring is supported by a movable spring receiver, the initial elasticity of the compression coil spring is supported by supporting the movable spring receiver with a circumferential cam and rotating the circumferential cam. Changing power is disclosed.
　他方、特許文献３には、圧縮コイルばねを伸縮式の２つのばね受けに嵌め込み、一方のばね受けをベースに回動自在に連結し、他方のばね受けでロッキングの荷重を受ける構成において、他方のばね受けを摘まみ付き調節ねじで移動させることで圧縮コイルばねを回動させることが開示されている。 On the other hand, in Patent Document 3, in a configuration in which a compression coil spring is fitted into two telescopic spring receivers, one spring receiver is rotatably connected to a base, and the other spring receiver receives a locking load. It is disclosed that the compression coil spring is rotated by moving the spring receiver with an adjusting screw with a knob.
　なお、ロッキング用ばね手段は、人が背もたれにもたれ掛かっていない状態でも荷重が付加されている。すなわち、ばね手段にはプリテンション（予備負荷）が掛けられている。これは、プリテンョンが掛けられていないと、人のもたれ掛かりによって背もたれが抵抗なしにいきなり大きく後傾してしまって危険だからである。また、背もたれの後傾に連動して座が後傾するシンクロ椅子の場合は、ロッキング用ばねのプリテンションは、着座しただけでは座が後傾しないように保持する役割も担っている。 The locking spring means is loaded even when the person is not leaning against the backrest. That is, a pretension (preliminary load) is applied to the spring means. This is because if the pretension is not applied, the backrest suddenly leans back greatly without resistance due to the leaning of the person, and it is dangerous. Further, in the case of a synchro chair in which the seat tilts backward in conjunction with the back tilt of the backrest, the pre-tensioning of the locking spring also plays a role of holding the seat so that it does not tilt backward only by sitting.
特開平１０－１７９３１２号公報Japanese Patent Laid-Open No. 10-177931 特開平１１－１６９２５４号公報JP-A-11-169254 特許第２５１９１６７号公報Japanese Patent No. 2519167
　ばね手段の弾力調節手段（反力調節手段）として特許文献１，２のような周面カムを使用すると、ロッキング時の弾力をワンタッチ的に調節できる利点がある。しかし、周面カムを回転させるにおいては、荷重の作用点を隣り合ったカム面に移行させるにおいてコイルばねをいったん圧縮させねばならないため、周面カムを軽快に回転させるためには摘まみを大きくせねばならない。 Using a peripheral cam as disclosed in Patent Documents 1 and 2 as an elastic force adjusting means (reaction force adjusting means) of the spring means has an advantage that the elastic force at the time of locking can be adjusted in one touch. However, when rotating the circumferential cam, the coil spring must be compressed once when the point of application of the load is shifted to the adjacent cam surface, so a large knob is required to rotate the circumferential cam lightly. I have to do it.
　他方、特許文献３のようにばねを回動させてモーメントを変える方式を採用すると、コイルばねをカムで支持する方式に比べると弾力調節の操作に要する力は軽減されるが、調節ねじを何回も回転させないとコイルばねの姿勢を変更できないため、調節操作が面倒であるという問題がある。 On the other hand, when the method of changing the moment by rotating the spring as in Patent Document 3, the force required for the operation of adjusting the elasticity is reduced compared to the method of supporting the coil spring by the cam, but what is the adjustment screw? Since the posture of the coil spring cannot be changed unless it is rotated many times, there is a problem that the adjustment operation is troublesome.
　本願発明はこのような現状に鑑み成されたものであり、改良された弾力調節機構を提供することを目的とするものである。また、本願では多くの改良点を開示しており、これらの改良点を提供することも発明の目的と成り得る。 The present invention has been made in view of such a current situation, and an object thereof is to provide an improved elasticity adjusting mechanism. In addition, many improvements are disclosed in the present application, and providing these improvements can be an object of the invention.
　本願発明が対象とする椅子は、基本構成として、座と、後傾動自在な背もたれと、前記背もたれの後傾動に抵抗を付与するロッキング用ばね手段と、前記背もたれの後傾動に対する前記ばね手段の抵抗の度合いを変える弾力調節部材とを備えている。そして、本願発明は、上記基本構成の基で様々に展開することができる。まず、第１の発明は上位概念を成すもので、この発明では、前記弾力調節部材は人が着座した状態で回転操作できるカムであり、前記背もたれの後傾動に伴うロッキング荷重が前記ばね手段に作用する位置を前記カムで変えることにより、前記ばね手段に掛かるモーメントを変えてばね手段の抵抗の度合いが調節される。 The chair to which the present invention is directed includes, as a basic structure, a seat, a backrest that can be tilted backward, a locking spring means that provides resistance to the back tilt of the backrest, and a resistance of the spring means against the back tilt of the backrest. And a resilience adjusting member that changes the degree of. The present invention can be developed in various ways based on the basic configuration. First, the first invention is a high-level concept. In this invention, the elasticity adjusting member is a cam that can be rotated while a person is seated, and a rocking load accompanying a back tilt of the backrest is applied to the spring means. By changing the acting position with the cam, the degree of resistance of the spring means is adjusted by changing the moment applied to the spring means.
　第１の発明は様々に展開できる。第１の発明の展開例として第２の発明では、脚の上端に設けたベースと、前記ベースに後傾動自在に連結した背フレームとを有しており、前記背フレームのうち傾動中心を挟んで前記背もたれと反対側の前端部に、前記ばね手段に当接する押圧部を設けている一方、前記ばね手段は、前後方向に長い軸心回りに巻かれた圧縮コイルばねであって、その前部を中心にして上下回動するように前記ベースに取り付けられていると共に、その後端は前記背フレームの押圧部で押される荷重受け部になっており、更に、前記背フレームの押圧部は、前記ばね手段の回動を許容するように側面視で前向き凹の円弧状になっている。 The first invention can be developed in various ways. As a development example of the first invention, in the second invention, it has a base provided at the upper end of the leg and a back frame connected to the base so as to be able to tilt backward, and sandwiches the tilt center of the back frame. In the front end portion on the opposite side of the backrest, a pressing portion that contacts the spring means is provided, while the spring means is a compression coil spring wound around a long axial center in the front-rear direction. It is attached to the base so as to rotate up and down around the part, the rear end is a load receiving part that is pressed by the pressing part of the back frame, and the pressing part of the back frame is The spring means has an arcuate concave shape in a side view so as to allow rotation of the spring means.
　第２の発明の展開例が第３の発明であり、この発明では、前記圧縮コイルばねは前後方向に伸縮するばね保持体に内蔵されている一方、前記カムは周面カムであって外周面には軸心からの距離が相違する複数のカム面を形成しており、前記ばね保持体に、前記周面カムにおける複数のカム面が選択的に当接するカム受け部を設けている。 A development example of the second invention is the third invention. In this invention, the compression coil spring is built in a spring holder that expands and contracts in the front-rear direction, while the cam is a peripheral cam and an outer peripheral surface. Are formed with a plurality of cam surfaces having different distances from the shaft center, and a cam receiving portion is provided on the spring holder so that the plurality of cam surfaces of the circumferential cam selectively contact each other.
　第３の発明の好適な展開例が第４の発明であり、この発明では、前記ばね保持体は、前後スライド自在に嵌まり合って前記ばねを一端と他端とから支持する２つのばね受けで構成されており、前記２つのばね受けは、前記圧縮コイルばねを予備圧縮させた状態で抜け不能に保持されている。第２の発明は第５の発明としても展開できる。この第５の発明では、前記ばね手段をカムに密着した状態に保持する離反防止手段が設けられており、前記離反防止手段は、前記カムが回転することを許容する弾性部を有している。 A preferred development example of the third invention is the fourth invention. In this invention, the spring holder is fitted in two slidably forward and backward directions so as to support the spring from one end and the other end. The two spring receivers are held so that they cannot be removed when the compression coil spring is pre-compressed. The second invention can also be developed as the fifth invention. In the fifth aspect of the invention, separation prevention means for holding the spring means in close contact with the cam is provided, and the separation prevention means has an elastic portion that allows the cam to rotate. .
　本願発明はばねユニットも含んでいる。このばねユニットに係る第６の発明は、圧縮コイルばねと、前記圧縮コイルばねをその一端と他端とから支持する２つのばね受けとを備えており、前記２つのばね受けは、伸縮自在に嵌まり合っていると共に、前記圧縮コイルばねを予備圧縮させた状態で離反不能に保持されており、前記２つのばね受けのうち一方には椅子のロッキング荷重が作用する荷重受け部を設け、他方には、椅子の構成部材に回動自在に連結される連結部を設けている。 The present invention also includes a spring unit. A sixth invention relating to this spring unit includes a compression coil spring and two spring receivers that support the compression coil spring from one end and the other end thereof, and the two spring receivers are extendable. And the compression coil spring is pre-compressed and held in an inseparable state, and one of the two spring receivers is provided with a load receiving portion on which a rocking load of the chair acts, and the other Is provided with a connecting portion that is rotatably connected to a constituent member of the chair.
　本願発明は、ロッキング用ばね手段に作用するモーメントを変えることでロッキングの弾力調節をするものであり、ロッキング用ばねにかかる初期荷重（プリテンション）を変えるものではないため、カムの回転に対してばね手段の弾性復原力が抵抗として作用することを防止又は著しく抑制できる。このため、コンパクトな操作部材であってもカムを軽快に回転操作することができる。すなわち、ロッキング用ばね手段の弾力調節を、コンパクトな操作部材でワンタッチ的に軽快に行い得る。 The present invention adjusts the elasticity of the locking by changing the moment acting on the locking spring means, and does not change the initial load (pretension) applied to the locking spring. It is possible to prevent or remarkably suppress the elastic restoring force of the spring means from acting as a resistance. For this reason, even if it is a compact operation member, a cam can be rotated easily. That is, the elastic adjustment of the locking spring means can be easily performed with a single operation with a compact operation member.
　さて、特許文献３の場合、コイルばねをその荷重受け点が背もたれの傾動支点から遠ざかるように回動させると、コイルばねに作用するモーメントは小さくなってロッキングに際してばねは「硬い」状態になる。逆に、コイルばねをその荷重受け点が背もたれの傾動支点に近づくように回動させると、コイルばねに作用するモーメントは大きくなり、ロッキングに際してばねは「柔らかい」状態になる。このようにモーメントを変えることで弾力調節を行う場合は、コイルばねはその姿勢に関係なく弾性復原力が一定であるのが好ましい。 In the case of Patent Document 3, when the coil spring is rotated so that its load receiving point moves away from the tilting fulcrum of the backrest, the moment acting on the coil spring becomes small, and the spring becomes “hard” when locking. Conversely, when the coil spring is rotated so that its load receiving point approaches the tilting fulcrum of the backrest, the moment acting on the coil spring increases, and the spring becomes “soft” during locking. When the elasticity is adjusted by changing the moment in this way, it is preferable that the coil spring has a constant elastic restoring force regardless of its posture.
　しかるに、特許文献３では、ロッキングのモーメントを圧縮コイルばねに作用させる面（荷重の作用面）は側面視で直線姿勢になっており、このため、圧縮コイルばねを回動させると圧縮コイルばねの全体の長さが変化し、初期弾性力が変化する。正確に述べると、圧縮コイルばねをその荷重作用点が背もたれの傾動支点から遠ざかるように回動させると、圧縮コイルばねは伸びて初期弾性力は弱くなり、逆に、圧縮コイルばねをその荷重作用点が背もたれの傾動支点に近づくように回動させると、圧縮コイルばねは縮んで初期弾性力は強くなる。従って、圧縮コイルばねの伸縮がモーメントの強弱変化を打ち消すように作用する。 However, in Patent Document 3, the surface on which the locking moment is applied to the compression coil spring (the load application surface) has a linear posture in a side view. Therefore, when the compression coil spring is rotated, the compression coil spring The overall length changes and the initial elastic force changes. To be precise, when the compression coil spring is rotated so that its load application point moves away from the tilting fulcrum of the backrest, the compression coil spring is stretched and the initial elastic force is weakened. When the point is rotated so as to approach the tilting fulcrum of the backrest, the compression coil spring contracts and the initial elastic force becomes stronger. Therefore, the expansion and contraction of the compression coil spring acts so as to cancel out the change in moment.
　これに対して本願の第２の発明では、背フレームの押圧部が側面視で前向き凹の円弧状になっているため、圧縮コイルばねの長さを変えることなく回動させることができる。このため、ロッキングの弾力を適切な度合いで変えることができると共に、圧縮コイルばねの弾性力がカムに作用することをより的確に防止又は抑制できる。なお、第２の発明の場合、カム受け部の側面視形状は、圧縮コイルばねの回動支点を中心にした曲率半径の円弧状であるのが好ましい。 On the other hand, in the second invention of the present application, the pressing portion of the spine frame has a concave arc shape facing forward when viewed from the side, so that it can be rotated without changing the length of the compression coil spring. For this reason, the elastic force of locking can be changed to an appropriate degree, and the elastic force of the compression coil spring can be prevented or suppressed more accurately. In the case of the second aspect of the invention, it is preferable that the side view shape of the cam receiving portion is an arc shape having a radius of curvature around the rotation fulcrum of the compression coil spring.
　第３の発明のように圧縮コイルばねを伸縮式のばね保持体に内蔵すると、圧縮コイルばねの姿勢変更をより簡単に実現することができる。この場合、第４の発明及び第６の発明のようにばね保持体の構成部材を抜け不能に保持していると、部材管理の手間を軽減できるのみならず、椅子の組み立ても容易となり、かつ、圧縮コイルばねの弾性力がカム受け部に作用することを的確に防止又は抑制できるため、弾力調節の操作性をより一層向上できる。 If the compression coil spring is built in the telescopic spring holder as in the third aspect of the invention, the posture change of the compression coil spring can be realized more easily. In this case, if the constituent members of the spring holder are held so as not to be detached as in the fourth and sixth inventions, not only can the labor of member management be reduced, but also the assembly of the chair becomes easy, and Since the elastic force of the compression coil spring can be accurately prevented or suppressed from acting on the cam receiving portion, the operability of the elasticity adjustment can be further improved.
　更に述べると、既述のように圧縮コイルばねは非ロッキング状態でもプリテンションがかけられているが、従来は、圧縮コイルばねとばね受け等の部材はそれぞれバラバラの部品として製造してから組み込まれており、このため、圧縮コイルばねを縮めた状態で可動ばね受けの取り付け等を行っていたため、部品管理に手間がかかると共に、椅子の組み立ても面倒であったが、本願の第４の発明及び第６の発明では、圧縮コイルばねは予めプリテンションが掛けられた状態でばね保持体に内蔵されているため、部品管理の手間を軽減できると共に、椅子の組み立ても極く簡単に行えるのである。 More specifically, as described above, the compression coil spring is pre-tensioned even in the non-locking state. However, conventionally, the compression coil spring and the spring receiver and the like are each assembled as separate parts after being manufactured. For this reason, since the movable spring receiver was attached in a state where the compression coil spring was contracted, it took time to manage the parts and the assembly of the chair was troublesome, but the fourth invention of the present application and In the sixth invention, since the compression coil spring is built in the spring holder in a pre-tensioned state, it is possible to reduce the labor of component management and to assemble the chair very easily.
　ばね手段の姿勢等を変えてモーメントを変える場合、ばね手段等はカムのカム面で押されて回動等するが、単なる周面カムの場合は、ばね手段等を押すことはできても引くことはできないため、何らかの手段により、カムをどちらの方向に回転させてもばね手段等が動くという可逆性を保持する必要がある。 When changing the moment by changing the posture of the spring means etc., the spring means etc. are pushed by the cam surface of the cam and turn etc. However, in the case of a simple circumferential cam, it can be pulled even if the spring means etc. can be pushed Therefore, it is necessary to maintain the reversibility that the spring means moves regardless of the direction of rotation of the cam by any means.
　この点、第５の発明を採用して離反防止手段を設けると、可逆性を確保してカムの機能を担保できる。また、請求項５のように離反防止手段に弾性部材を設けると、隣り合ったカム面に移行するにおいていったん弾性部材を変形させることになるため、カム面の移行に際してカチッというクリック感を確保できる。このため、弾力が調節された状態を人は的確に把握できて好ましい。 In this respect, when the fifth invention is adopted and the separation preventing means is provided, the function of the cam can be secured while ensuring the reversibility. Further, when the elastic member is provided in the separation preventing means as in the fifth aspect, the elastic member is once deformed when moving to the adjacent cam surface, so that a click feeling can be secured when the cam surface is transferred. . For this reason, it is preferable that a person can accurately grasp the state in which the elasticity is adjusted.
第１実施形態に係る椅子の外観を示す図で、（Ａ）は前から見た斜視図、（Ｂ）は後ろから見た斜視図、（Ｃ）は側面図である。It is a figure which shows the external appearance of the chair which concerns on 1st Embodiment, (A) is the perspective view seen from the front, (B) is the perspective view seen from back, (C) is a side view. （Ａ）は椅子全体の分離斜視図、（Ｂ）は背フレームの縦断側面図である。(A) is the isolation | separation perspective view of the whole chair, (B) is a vertical side view of a back frame. 椅子全体の分離斜視図である。It is a separation perspective view of the whole chair. （Ａ）は支持機構部を前下方から見た斜視図、（Ｂ）は支持機構部を横下方から見た斜視図である。(A) is the perspective view which looked at the support mechanism part from the front lower part, (B) is the perspective view which looked at the support mechanism part from the horizontal lower part. 支持機構部の分離斜視図である。It is a separation perspective view of a support mechanism part. （Ａ）は座部を裏返した状態での分離斜視図、（Ｂ）は座アウターシェルと中間金具との分離斜視図、（Ｃ）は座アウターシェルの部分拡大斜視図である。(A) is the isolation | separation perspective view in the state which turned the seat part upside down, (B) is the isolation | separation perspective view of a seat outer shell and an intermediate | middle metal fitting, (C) is a partial expansion perspective view of a seat outer shell. ベースを中心にした支持機構部の平面図である。It is a top view of the support mechanism part centering on the base. （Ａ）はベースを中心にした支持機構部の一部分離斜視図、（Ｂ）は図７のVIIIA-VIIIA 視断面図、（Ｃ）は図７の VIIIC-VIIIC視断面図である。(A) is a partially separated perspective view of the support mechanism part centered on the base, (B) is a cross-sectional view taken along line VIIIA-VIIIA in FIG. 7, and (C) is a cross-sectional view taken along line VIIIC-VIIIC in FIG. （Ａ）は支持機構部の縦断側面図、（Ｂ）は押動軸とばね当たりとの分離斜視図である。(A) is a vertical side view of the support mechanism, and (B) is a separated perspective view of the push shaft and the spring contact. （Ａ）は図７の XI-XI視で見た説明用断面図、（Ｂ）（Ｃ）は（Ａ）の部分拡大図である。(A) is sectional drawing for description seen in XI-XI view of FIG. 7, (B) (C) is the elements on larger scale of (A). （Ａ）は弾力調節ユニットとベースとの分離斜視図、（Ｂ）は弾力調節部材の一部分離斜視図である。(A) is a separated perspective view of the elasticity adjusting unit and the base, and (B) is a partially separated perspective view of the elasticity adjusting member. （Ａ）は弾力調節部材の分離斜視図、（Ｂ）はばね保持体の分離斜視図、（Ｃ）はばねユニットの斜視図である。(A) is a separated perspective view of an elastic adjustment member, (B) is a separated perspective view of a spring holder, and (C) is a perspective view of a spring unit. 弾力調節部材の分離斜視図である。It is a separation perspective view of an elastic adjustment member. （Ａ）は中間金具とロック装置との分離斜視図、（Ｂ）は支持機構部の分離斜視図である。(A) is a separated perspective view of an intermediate | middle metal fitting and a locking device, (B) is a separated perspective view of a support mechanism part. （Ａ）はロック装置の取り付け状態を示す下方斜視図、（Ｂ）はロック装置の斜視図、（Ｃ）はロック装置の抜け止め構造を示す一部破断斜視図である。(A) is a lower perspective view showing a mounting state of the locking device, (B) is a perspective view of the locking device, and (C) is a partially broken perspective view showing a retaining structure of the locking device. （Ａ）（Ｂ）とも第２実施形態に係る弾力調節ユニットの分離斜視図である。(A) (B) is a separation perspective view of the elasticity adjustment unit concerning a 2nd embodiment. 第２実施形態に係る弾力調節ユニットの斜視図、（Ｂ）は弾力調節部材とベースとの関係を示す分離側面図である。The perspective view of the elasticity adjustment unit which concerns on 2nd Embodiment, (B) is the isolation | separation side view which shows the relationship between an elasticity adjustment member and a base. 第３～第５実施形態を示す模式図である。FIG. 6 is a schematic diagram showing third to fifth embodiments. 座の分離斜視図である。It is a separation perspective view of a seat. （Ａ）は要部の平面図、（Ｂ）は（Ａ）の一部を側方から見た断面斜視図である。(A) is the top view of the principal part, (B) is the cross-sectional perspective view which looked at a part of (A) from the side. （Ａ）は図２０（Ａ）のIA-IA 視断面図、（Ｂ）は図２０（Ａ）をＢ－Ｂ視方向から見た断面斜視図、（Ｃ）は図２０（Ａ）をＣ－Ｃ視方向から見た断面斜視図である。20A is a cross-sectional view taken along the line IA-IA of FIG. 20A, FIG. 20B is a cross-sectional perspective view of FIG. 20A viewed from the BB direction, and FIG. 20C is a cross-sectional view of FIG. It is a cross-sectional perspective view seen from the -C viewing direction. （Ａ）は図２０（Ａ）の IIA-IIA視断面図、（Ｂ）は図２０（Ａ）の IIB-IIB視断面図である。20A is a cross-sectional view taken along the line IIA-IIA in FIG. 20A, and FIG. 20B is a cross-sectional view taken along the line IIB-IIB in FIG. （Ａ）は図２０（Ａ）をＡ′－Ａ′視方向から見た断面斜視図、（Ａ）は図２０（Ａ）をＢ′－Ｂ′視方向から見た断面斜視図、（Ｃ）は図２０（Ａ）をＣ′－Ｃ′方向から見た断面斜視図である。20A is a sectional perspective view of FIG. 20A viewed from the A′-A ′ viewing direction, FIG. 20A is a sectional perspective view of FIG. 20A viewed from the B′-B ′ viewing direction, and FIG. ) Is a cross-sectional perspective view of FIG. 20A viewed from the C′-C ′ direction. （Ａ）は座調節用操作レバーが装着されている部分を上から見た斜視図、（Ｂ）は座調節用操作レバーと座アウターシェルとの分離斜視図である。(A) is the perspective view which looked at the part by which the operation lever for seat adjustment was mounted | worn from the top, (B) is the isolation | separation perspective view of a seat adjustment operation lever and a seat outer shell. （Ａ）は座調節用操作レバーとスライドアウターシェルとの分離斜視図、（Ｂ）は座調節用操作レバーの分離斜視図、（Ｃ）は座調節用操作レバーが装着されている部分を上から見た斜視図である。(A) is a separated perspective view of the seat adjusting operation lever and the slide outer shell, (B) is a separated perspective view of the seat adjusting operation lever, and (C) is a top view of the portion where the seat adjusting operation lever is mounted. It is the perspective view seen from. （Ａ）（Ｂ）とも背もたれと第２背フレームとの分離斜視図である。(A) (B) is the isolation | separation perspective view of a backrest and a 2nd back frame. （Ａ）（Ｂ）とも初期角度調節装置を説明するための分離斜視図である。(A) and (B) are separation perspective views for explaining an initial angle adjusting device. （Ａ）は操作具と背もたれとの分離斜視図、（Ｂ）は初期角度調節装置の斜視図、（Ｃ）は背インナーシェルの下端部の斜視図である。(A) is a separated perspective view of an operating tool and a backrest, (B) is a perspective view of an initial angle adjusting device, and (C) is a perspective view of a lower end portion of a back inner shell. 図１（Ａ）のXXIX-XXIX 視断面図である。FIG. 2 is a cross-sectional view taken along line XXIX-XXIX in FIG. （Ａ）は要部の縦断側面図、（Ｂ）は（Ａ）のＢ－Ｂ視断面図である。(A) is a longitudinal side view of the main part, and (B) is a sectional view taken along the line BB of (A). （Ａ）は初期角度調節装置を示す断面斜視図、（Ｂ）は図８の XB-XB視断面図である。(A) is a cross-sectional perspective view showing the initial angle adjusting device, and (B) is a cross-sectional view taken along line XB-XB in FIG. 他の背もたれ初期角度調節装置の分離斜視図である。It is the isolation | separation perspective view of the other backrest initial angle adjustment apparatus. （Ａ）（Ｂ）とも分離斜視図である。(A) and (B) are separate perspective views. （Ａ）は周面カムの嵌め込み状態を示す斜視図、（Ｂ）は操作具と周面カムとの分離斜視図である。(A) is a perspective view which shows the fitting state of a surrounding surface cam, (B) is a separate perspective view of an operation tool and a surrounding surface cam. （Ａ）は要部の縦断正面図、（Ｂ）は（Ａ）のＢ－Ｂ視断面図である。(A) is a longitudinal front view of the main part, and (B) is a sectional view taken along the line BB of (A).
　次に、本願発明の実施形態を図面に基づいて説明する。まず、図１～図１４に示す第１実施形態から説明する。以下の説明では方向を特定するため「前後」「左右」の文言を使用するが、この前後左右の文言は着座した人を基準にしている。正面視方向は着座した人と対向した方向であり、従って、正面視での左右と着座した人から見た左右とは逆になる。 Next, an embodiment of the present invention will be described with reference to the drawings. First, the first embodiment shown in FIGS. 1 to 14 will be described. In the following description, the words “front and rear” and “left and right” are used to specify the direction, but the words on the front and rear and right and left are based on the person who is seated. The front view direction is the direction facing the seated person, and therefore the left and right in the front view are opposite to the left and right viewed from the seated person.
　(1).椅子の概略
　まず、椅子の概要を、主として図１～図５に基づいて説明する。本実施形態は事務用等に多用されている回転椅子に適用しており、図１に示すように、椅子は、脚支柱１のみを表示している脚装置と、脚支柱１の上端に固定したベース２と、ベース２の上に配置した座３と、着座した人がもたれ掛かり得る背もたれ４とを有している。例えば図２，３に示すように、ベース２の上に金属板製の中間金具（座受け金具）５が配置されており、この中間金具５に樹脂製の座アウターシェル６が取り付けられている。 (1). Outline of Chair First, an outline of a chair will be described mainly with reference to FIGS. This embodiment is applied to a swivel chair often used for office work etc., as shown in FIG. 1, the chair is fixed to the leg device displaying only the leg column 1 and the upper end of the leg column 1. The base 2, the seat 3 disposed on the base 2, and the backrest 4 on which the person who is seated can lean against. For example, as shown in FIGS. 2 and 3, an intermediate metal fitting (seat receiving metal fitting) 5 made of a metal plate is disposed on the base 2, and a resin seat outer shell 6 is attached to the intermediate fitting 5. .
　図２のとおり、座３は、樹脂製の座インナーシェル（座板）７とその上面に重ね配置した座クッション材８とを有しており、座クッション材８はクロス等の表皮材で上から覆われている。本実施形態では、座アウターシェル６は、中間金具５に固定された固定アウターシェル９とその手前に突出したスライドアウターシェル１０とで構成されており、スライドアウターシェル１０は固定アウターシェル９に前後スライド自在に取り付けられている。 As shown in FIG. 2, the seat 3 has a resin seat inner shell (seat plate) 7 and a seat cushion material 8 arranged on the upper surface thereof. The seat cushion material 8 is an upper skin material such as a cloth. Covered from. In the present embodiment, the seat outer shell 6 is composed of a fixed outer shell 9 fixed to the intermediate metal fitting 5 and a slide outer shell 10 protruding in front thereof, and the slide outer shell 10 is front and rear with respect to the fixed outer shell 9. It is slidably attached.
　また、図２に示すように、座インナーシェル７のうち前側のある程度の範囲は、側面視で下向きに容易に曲がり変形する変形許容部７ｃになっており、変形許容部７ｃの前端部がスライドアウターシェル１０の前端部に連結されている。このため、スライドアウターシェル１０を前後スライドさせると座インナーシェル７の変形許容部７ｃが前向きに伸びたり下向きに巻き込まれたりする。これにより、座３の前後長さを調節できる。なお、座アウターシェル６を座の一部と見ることも可能であり、また、座３と座アウターシェル６とで座部が構成されていると観念することも可能である。変形許容部７ｃには左右横長のスリットを多数形成している。座３の構造の詳細は後述する。 Further, as shown in FIG. 2, a certain range on the front side of the seat inner shell 7 is a deformation allowing portion 7c that easily bends and deforms downward in a side view, and the front end portion of the deformation allowing portion 7c slides. It is connected to the front end of the outer shell 10. For this reason, when the slide outer shell 10 is slid back and forth, the deformation allowing portion 7c of the seat inner shell 7 extends forward or winds downward. Thereby, the front-rear length of the seat 3 can be adjusted. Note that the seat outer shell 6 can be viewed as a part of the seat, and it can also be considered that the seat is constituted by the seat 3 and the seat outer shell 6. A large number of horizontally elongated slits are formed in the deformation allowing portion 7c. Details of the structure of the seat 3 will be described later.
　図１，２に示すように、背もたれ４は樹脂製の背インナーシェル（背板）１２とその前面に重ね配置したクッション材１３とを有しており、クッション材１３と背インナーシェル１２とは袋状の表皮材ですっぽり覆われている。なお、背もたれ４は、着座した人の腰椎に当たるランバーサポート部を形成している。換言すると、背もたれ４は、着座した人の腰椎に当たる部位が最も前になるように縦断側面視形状が前向き凸状にカーブした形態になっている。敢えて述べるまでもないが、背もたれ４や座３は任意の形態・構造を選択できる。 As shown in FIGS. 1 and 2, the backrest 4 has a resin-made back inner shell (back plate) 12 and a cushion material 13 disposed on the front surface thereof. The cushion material 13 and the back inner shell 12 are It is completely covered with a bag-shaped skin material. The backrest 4 forms a lumbar support that hits the lumbar spine of the person who is seated. In other words, the backrest 4 has a shape in which a longitudinal side view is curved in a forwardly convex shape so that a portion corresponding to the lumbar vertebra of the seated person is in front. Needless to say, the backrest 4 and the seat 3 can be of any form / structure.
　図１（Ｃ）や図２に示すように、ベース２には第１背フレーム１４が後傾動自在に連結されていると共に、第１背フレーム１４にはその後ろに位置した第２背フレーム１５が固定されており、第２背フレーム１５に背もたれ４が取り付けられている。第１背フレーム１４は樹脂製又はアルミダイキャスト製であり、図３や図５に示すように、ベース２の後ろにおいて左右方向に広がる基部１４ａと、基部１４ａの左右両側部からベース２の外側位置で前向きに延びるアーム部１４ｂとを有しており、左右アーム部１４ｂの前端部が左右横長の第１軸１６でベース２に連結されている。従って、背もたれ４は、第１軸１６の軸心回りに傾動する。敢えて述べるまでもないが、ベース２には第１軸１６が嵌まる軸受け穴１７を空けている（図３，５参照）。 As shown in FIG. 1C and FIG. 2, a first back frame 14 is connected to the base 2 so as to be tiltable rearwardly, and a second back frame 15 located behind the first back frame 14. Is fixed, and the backrest 4 is attached to the second back frame 15. The first back frame 14 is made of resin or aluminum die-cast, and as shown in FIGS. 3 and 5, a base portion 14 a that extends in the left-right direction behind the base 2, and an outer side of the base 2 from both left and right sides of the base portion 14 a. The arm portion 14b extends forward at a position, and the front end portions of the left and right arm portions 14b are connected to the base 2 by a horizontally elongated first shaft 16. Accordingly, the backrest 4 tilts around the axis of the first shaft 16. Needless to say, the base 2 has a bearing hole 17 into which the first shaft 16 is fitted (see FIGS. 3 and 5).
　図３，４のとおり、第１背フレーム１４における左右アーム部１４ｂの前部は、左右内側に入り込んだクランク部１４ｃになっており、クランク部１４ｃの基端部に第１軸１６が貫通している。また、左右クランク部１４ｃの前端は左右横長の押動軸１８で一体に繋がっている。押動軸１８は、下カバー１９（図５参照）で下方から覆われている。下カバー１９の左右側板には、押動軸１８の回動を許容する長穴２０が上向きに開口している。 As shown in FIGS. 3 and 4, the front portion of the left and right arm portions 14 b in the first back frame 14 is a crank portion 14 c entering the left and right inner sides, and the first shaft 16 penetrates the base end portion of the crank portion 14 c. ing. Further, the front ends of the left and right crank portions 14c are integrally connected by a laterally long push shaft 18. The push shaft 18 is covered from below by a lower cover 19 (see FIG. 5). In the left and right side plates of the lower cover 19, elongated holes 20 that allow the push shaft 18 to rotate are opened upward.
　図２（Ｂ）に示すように、第１背フレムー１４の後部と第２背フレーム１５の前部とは上下から重なり合っており、両者はビス２１で固定されている。第２背フレーム１５は樹脂製又はアルミダイキャスト製であり、左右方向に延びる基部１５ａと、基部１５ａの後端に設けた角形の左右２本の背支柱１５ｂとを有しており、背もたれ４は、ランバーサポート部の高さ位置を中心にして前後に回動し得るように背支柱１５ｂの頭部１５ｃに連結されている。背もたれ４は、初期角度調節機構によって回動姿勢を複数段階に変更できる。この点は後述する。 As shown in FIG. 2B, the rear portion of the first back frame 14 and the front portion of the second back frame 15 overlap from above and below, and both are fixed with screws 21. The second back frame 15 is made of resin or aluminum die-cast, and has a base portion 15a extending in the left-right direction and two square left and right back posts 15b provided at the rear end of the base portion 15a. Is connected to the head portion 15c of the back column 15b so as to be able to rotate back and forth around the height position of the lumbar support portion. The backrest 4 can change the rotation posture in a plurality of stages by the initial angle adjustment mechanism. This point will be described later.
　背フレーム１４，１４及び背もたれ４は第１軸１６を中心にして後傾動する。そこで、図２（Ｂ），図３，図５に示すように、ベース２の内部に弾力調節ユニット２３を設けて、第１背フレーム１４の後傾動に抵抗を付与している。 The back frames 14 and 14 and the backrest 4 tilt backward about the first shaft 16. Therefore, as shown in FIGS. 2B, 3, and 5, a resilience adjusting unit 23 is provided inside the base 2 to provide resistance to the rearward tilting of the first back frame 14.
　本実施形態の椅子は、背もたれ４の後傾に連動して座３が後退しつつ後傾するシンクロタイプの椅子であり、そこで、図３から推測できるように、中間金具５の前部を弾力調節ユニット２３の前部（或いはベース２の前部）に後退動可能に連結し、中間金具５の後部は、第１背フレーム１４に上向き突設したブラケット部２４に左右横長の第２軸２５で連結されている。また、本実施形態では、背もたれ４を任意の後傾角度に保持するためのロック装置としてのロック用ガスシリンダ２６を有しており、このロック用ガスシリンダ２６は弾力調節ユニット２３の上に前後長手の姿勢で配置されている。 The chair of the present embodiment is a synchro-type chair in which the seat 3 is retracted in conjunction with the backward tilting of the backrest 4, and the front part of the intermediate bracket 5 is elastic as can be estimated from FIG. The rear part of the intermediate metal fitting 5 is connected to the front part of the adjustment unit 23 (or the front part of the base 2) so as to be able to move backward, and the bracket part 24 projecting upward on the first back frame 14 is provided with a horizontally elongated second shaft 25. It is connected with. Further, in this embodiment, a lock gas cylinder 26 is provided as a lock device for holding the backrest 4 at an arbitrary rearward tilt angle. It is arranged in a longitudinal posture.
　(2).ベース・座アウターシェル
　以下、従前の図に加えて図６以降の図面も参照して各部位の詳細を説明する。まず、ベース２及びこれと座アウターシェル６との関係を説明する。例えば図３，５に示すように、ベース２は上向きに開口した箱型の形態であり、手前に行くに従って深さが浅くなっている。ベース２の上端縁には、全周にわたって外向きフランジ２９が形成されている。 (2) Base / seat outer shell Details of each part will be described below with reference to FIG. 6 and subsequent drawings in addition to the previous drawings. First, the relationship between the base 2 and this and the seat outer shell 6 will be described. For example, as shown in FIGS. 3 and 5, the base 2 has a box shape that opens upward, and the depth becomes shallower toward the front. An outward flange 29 is formed on the upper end edge of the base 2 over the entire circumference.
　例えば図３から理解できるように、ベース２の後半部の底は段が上がって高くなっており、この高くなった部位に、底板と左右側板３０ａとを有する溝型のベースブラケット３０が溶接によって固定されている。ベースブラケット３０の底板とベース２の底板とに上下開口のブッシュ３１が溶接されており、ブッシュ３１に脚支柱（ガスシリンダ）１の上端が下方から嵌着している。また、ベースブラケット３０の左右側板３０ａには左右横長の第３軸３２が貫通しており、第３軸３２でロック用ガスシリンダ２６が前向き移動不能に支持されている。第３軸３２は、ベースブラケット３０の左右側板３０ａに取り付けられている。 For example, as can be understood from FIG. 3, the bottom of the rear half of the base 2 is raised and raised, and a groove-type base bracket 30 having a bottom plate and left and right side plates 30a is welded to the raised portion. It is fixed. A bush 31 having an upper and lower opening is welded to the bottom plate of the base bracket 30 and the bottom plate of the base 2, and the upper end of the leg column (gas cylinder) 1 is fitted to the bush 31 from below. The left and right side plates 30a of the base bracket 30 pass through a horizontally long third shaft 32, and the lock gas cylinder 26 is supported by the third shaft 32 so as not to move forward. The third shaft 32 is attached to the left and right side plates 30 a of the base bracket 30.
　例えば図３や図６（Ｂ）に示すように、中間金具５は概ね平面視四角形に近い形状であり、上板５ａと左右側板５ｂとを有している。第２軸２５は側板５ｂに貫通している。なお、図２に示すように、中間金具５の側板５ｂは、第１背フレーム１４におけるブラケット部２４の内側に位置している。 For example, as shown in FIG. 3 and FIG. 6 (B), the intermediate metal fitting 5 has a shape that is almost a square in plan view, and has an upper plate 5a and left and right side plates 5b. The second shaft 25 penetrates the side plate 5b. As shown in FIG. 2, the side plate 5 b of the intermediate fitting 5 is located inside the bracket portion 24 in the first back frame 14.
　図６（Ｂ）に示すように、固定アウターシェル９には、中間金具５にすっぽり嵌まり込む凹所３３が形成されている。そして、中間金具５の上面の前端に左右一対の前向きストッパー３４を設けている一方、固定アウターシェル９における凹所３３の前端部には、前向きストッパー３４が後ろから嵌まるトンネル形の受け部３５を一体に形成している。 As shown in FIG. 6B, the fixed outer shell 9 is formed with a recess 33 that fits into the intermediate metal fitting 5 completely. A pair of left and right forward stoppers 34 is provided at the front end of the upper surface of the intermediate metal fitting 5, while a tunnel-shaped receiving portion 35 into which the forward stopper 34 is fitted from behind is provided at the front end portion of the recess 33 in the fixed outer shell 9. Are integrally formed.
　更に、中間金具５における上板５ａの後端部に、左右横長で角形のロック穴３６を空けている一方、固定アウターシェル９における凹所３３の後端部に、ロック穴３６に嵌まるロック爪３７を下向きに突設している。ロック爪３７は弾性変形してからロック穴３６に嵌まり込む。これにより、固定アウターシェル９は中間金具５に抜け不能に取り付けられる。 Further, a left and right horizontally long and rectangular lock hole 36 is formed in the rear end portion of the upper plate 5 a in the intermediate metal 5, while a lock that fits in the lock hole 36 in the rear end portion of the recess 33 in the fixed outer shell 9. The claw 37 is protruded downward. The lock claw 37 is fitted into the lock hole 36 after being elastically deformed. Thereby, the fixed outer shell 9 is attached to the intermediate metal fitting 5 so as not to be detached.
　例えば図５に示すように、弾力調節ユニット２３は、ベース２の前部に嵌まる左右一対の支持ブラケット３８を有している。支持ブラケット３８は板材製でベース２の内側面の内側に配置されており、この支持ブラケット３８の前部には、ベース２の外向きフランジ２９に上から重なる羽根部３９を横向きに突設している。ベース２の外向きフランジ２９には支持ブラケット３８の羽根部３９に重なる張り出し部２９ａが形成されており、張り出し部２９ａには、羽根部３９を左右ずれ不能に保持するストッパー片４０が上向き突設されている。 For example, as shown in FIG. 5, the elasticity adjusting unit 23 has a pair of left and right support brackets 38 that fit into the front portion of the base 2. The support bracket 38 is made of a plate material and is disposed on the inner side of the inner surface of the base 2, and at the front portion of the support bracket 38, a blade portion 39 that overlaps the outward flange 29 of the base 2 from above is provided to project sideways. ing. The outward flange 29 of the base 2 is formed with an overhanging portion 29a that overlaps the blade portion 39 of the support bracket 38, and a stopper piece 40 that holds the blade portion 39 so as not to be laterally displaced protrudes upward from the overhanging portion 29a. Has been.
　ベース２の張り出し部２９ａと支持ブラケット３８の羽根部３９には、樹脂製のスライダ受け４１が左右外側から嵌まっており、図８（Ｂ）に示すように、これらスライダ受け４１と羽根部３９と張り出し部２９ａとはビス４２で共締めされている。そして、例えば図３に示すように、中間金具５にはスライダ受け４１に上から重なる横向き突出部４３を設けており、図８（Ｃ）に示すように、横向き突出部４３の外端部の下面に装着した樹脂製のスライダ４４がスライダ受け４１に上から当接している（図４（Ａ）も参照）。 A resin-made slider receiver 41 is fitted to the protruding portion 29a of the base 2 and the blade portion 39 of the support bracket 38 from the left and right outer sides, and as shown in FIG. The overhanging portion 29 a is fastened together with screws 42. For example, as shown in FIG. 3, the intermediate fitting 5 is provided with a laterally projecting portion 43 that overlaps the slider receiver 41 from above, and as shown in FIG. 8C, an outer end portion of the laterally projecting portion 43 is provided. A resin slider 44 mounted on the lower surface is in contact with the slider receiver 41 from above (see also FIG. 4A).
　図８（Ｃ）のとおり、スライダ受け４１のうちスライダ４４を支持する外端部４１ａの上面は、側面視で上向き凸の状態に湾曲した形状になっている。このため、中間金具５は（座３は）、ロッキングに際して滑らかに動いて後傾しつつ後退する。図４（Ａ）に示すように、中間金具５の横向き突出部４３には、スライダ受け４１を左右外側と後ろから囲う壁部４３ａが下向きに突設されている。 As shown in FIG. 8C, the upper surface of the outer end portion 41a that supports the slider 44 in the slider receiver 41 has a curved shape that is convex upward in a side view. For this reason, the intermediate metal fitting 5 (the seat 3) moves smoothly during the locking and moves backward while tilting. As shown in FIG. 4 (A), a wall portion 43a that surrounds the slider receiver 41 from the left and right sides and from behind is projected downward from the laterally projecting portion 43 of the intermediate fitting 5.
　他方、図８（Ａ）のとおり、スライダ受け４１における外端部の上部は左右外側に張り出した突出部４１ａになっており、図４（Ａ）のとおり、中間金具５の壁部４３ａには、スライダ受け４１における突出部４１ａの下方に位置するストッパー片４５（図１５（Ａ）も参照）を曲げ形成している。従って、中間金具５の前部は上向き移動不能に保持されており、このため、座３の前部を上に持ち上げても中間金具５がベース２から外れることはない。なお、中間金具５とベース２との離脱防止機能は他の部材によっても講じられているが、本願との関連はないので説明は省略する。 On the other hand, as shown in FIG. 8 (A), the upper portion of the outer end of the slider receiver 41 is a protruding portion 41a projecting to the left and right sides, and as shown in FIG. A stopper piece 45 (see also FIG. 15A) positioned below the protrusion 41a of the slider receiver 41 is bent. Therefore, the front part of the intermediate metal fitting 5 is held so as not to be able to move upward. Therefore, even if the front part of the seat 3 is lifted up, the intermediate metal fitting 5 does not come off the base 2. In addition, although the separation preventing function between the intermediate metal fitting 5 and the base 2 is provided by other members, the description thereof is omitted because it is not related to the present application.
　(3).弾力調節機構
　次に、弾力調節ユニット２３を中心にした弾力調節機構を説明する。例えば図５に示すように、弾力調節ユニット２３は、既に述べた左右一対の支持ブラケット３８と、左右の支持ブラケット３８の間に配置されたばねユニット５０と、左右の支持ブラケット３８に回転自在に取り付けた操作軸５１と、ばねユニット５０の左右両側部に装着した側面視略Ｌ形の姿勢保持体５２とを有している。姿勢保持体５２は請求項に記載した離反防止手段の一例である。 (3) Elasticity adjustment mechanism Next, an elasticity adjustment mechanism centered on the elasticity adjustment unit 23 will be described. For example, as shown in FIG. 5, the elasticity adjusting unit 23 is rotatably attached to the pair of left and right support brackets 38, the spring unit 50 disposed between the left and right support brackets 38, and the left and right support brackets 38. The operation shaft 51 and a substantially L-shaped posture holding body 52 mounted on the left and right side portions of the spring unit 50 are provided. The posture holding body 52 is an example of the separation preventing means described in the claims.
　図１２に示すように、ばねユニット５０は、略角形で後ろ向きに開口した筒状の第１ばね受け５３と、第１ばね受け５３の内部に配置された圧縮コイルばね５４と、第１ばね受け５３にスライド自在に嵌まった第２ばね受け５５とで構成されている。第１ばね受け５３と第２ばね受け５５とで請求項に記載した支持体が構成されている。本実施形態の支持体は中空のケース構造になっているので、両第ばね受け５３，５４でばねケースが構成されているということもできる。当然ながら、両ばね受け５３，５５から成るばね保持体は伸縮する。 As shown in FIG. 12, the spring unit 50 includes a cylindrical first spring receiver 53 that is substantially square and opened rearward, a compression coil spring 54 disposed inside the first spring receiver 53, and a first spring receiver. The second spring receiver 55 is slidably fitted to the slidable member 53. The first spring receiver 53 and the second spring receiver 55 constitute the support described in the claims. Since the support body of this embodiment has a hollow case structure, it can be said that the spring case is constituted by both the second spring receivers 53 and 54. Naturally, the spring holding body composed of both spring receivers 53 and 55 expands and contracts.
　第２ばね受け５５は概ね角形の形態を成しており、このため、第１ばね受け５３の内部も概ね角形に近い形状になっている。また、第２ばね受け５５の左右側面にはガイド突条５６を設けている一方、第１ばね受け５３の内側面には、ガイド突条５６が嵌まるガイド溝５７を形成している。なお、伸縮方向を基準にすると第１ばね受け５３は動かずに第２ばね受け５５が動くので、第１ばね受け５３を固定ばね受けと呼んで第２ばね受け５５を可動ばね受けと呼ぶことも可能である。 The second spring receiver 55 has a substantially square shape. Therefore, the inside of the first spring receiver 53 is also substantially in the shape of a square. Further, guide ribs 56 are provided on the left and right side surfaces of the second spring receiver 55, while guide grooves 57 into which the guide protrusions 56 are formed are formed on the inner surface of the first spring receiver 53. Since the first spring receiver 53 does not move and the second spring receiver 55 moves when the expansion / contraction direction is used as a reference, the first spring receiver 53 is called a fixed spring receiver and the second spring receiver 55 is called a movable spring receiver. Is also possible.
　第１ばね受け５３と第２ばね受け５５には、抜け防止手段の一例として左右横長のピン５８が貫通しており、第１ばね受け５３のピン挿通穴５９を前後に長い長穴とすることにより、第２ばね受け５５の前後スライド（ばねユニット５０の伸縮）が許容されている。第１ばね受け５３の前端部には左右外側に突出した支軸６０を設けており、支軸６０は支持ブラケット３８に設けた穴６１にブッシュを介して嵌まっている。従って、本実施形態では支軸６０が請求項に記載した連結部になっている。支持ブラケット３８はベース２に固定されているので、ばねユニット５０は支軸６０を中心にして上下回動する。 The first spring receiver 53 and the second spring receiver 55 have left and right horizontally elongated pins 58 as an example of a slip prevention means, and the pin insertion holes 59 of the first spring receiver 53 are long holes in the front and rear direction. Therefore, the second spring receiver 55 is allowed to slide back and forth (the expansion and contraction of the spring unit 50). A support shaft 60 projecting left and right is provided at the front end of the first spring receiver 53, and the support shaft 60 is fitted into a hole 61 provided in the support bracket 38 via a bush. Therefore, in this embodiment, the support shaft 60 is a connecting portion described in the claims. Since the support bracket 38 is fixed to the base 2, the spring unit 50 rotates up and down around the support shaft 60.
　そして、例えば図９，図１２（Ａ）に示すように、第１背フレーム１４の前端に設けた押動軸１８にプッシャー６２を装着し、プッシャー６２で第２ばね受け５５を押すようになっている。従って、本実施形態では、第２ばね受けの先端が請求項に記載した荷重受け部になっている。プッシャー６２は請求項に記載した押動部の一例である。第２ばね受け５５の後端部は側面視で後ろ向き凸の山形になっている一方、プッシャー６２の前面は側面視で支軸６０を中心にした曲率半径の円弧面６２ａになっている。また、第２ばね受け５５の先端部は、プッシャー６２に対して接触状に当たるように側面視で山形（クサビ形）になっている。 For example, as shown in FIGS. 9 and 12A, the pusher 62 is attached to the push shaft 18 provided at the front end of the first back frame 14, and the second spring receiver 55 is pushed by the pusher 62. ing. Therefore, in this embodiment, the front-end | tip of a 2nd spring receiver becomes the load receiving part described in the claim. The pusher 62 is an example of a pushing portion described in the claims. The rear end portion of the second spring receiver 55 has a mountain shape that protrudes backward in a side view, while the front surface of the pusher 62 is an arc surface 62a having a radius of curvature centering on the support shaft 60 in a side view. The tip of the second spring receiver 55 has a mountain shape (wedge shape) in a side view so as to come into contact with the pusher 62.
　図９（Ｂ）から容易に理解できるように、押動軸１８には前板６３ａと底板６３ｂと左右側板６３ｃとを有する位置決め部材６３が固着されており、プッシャー６２には、位置決め部材６３に上から嵌まる凹所６４が形成されており、このため、プッシャー６２は左右ずれ不能でかつ回転不能に保持されている。プッシャー６２の前面には、第２ばね受け５５との片当たりを防止するため縦溝を形成している。なお、プッシャー６２の前面に耐磨耗性に優れたライニング材を装着することも可能である。 As can be easily understood from FIG. 9B, a positioning member 63 having a front plate 63 a, a bottom plate 63 b, and left and right side plates 63 c is fixed to the push shaft 18, and the pusher 62 is attached to the positioning member 63. A recess 64 that fits from above is formed. Therefore, the pusher 62 is held so that it cannot be displaced left and right and cannot rotate. A longitudinal groove is formed on the front surface of the pusher 62 in order to prevent the second spring receiver 55 from coming into contact with one side. It is also possible to attach a lining material having excellent wear resistance to the front surface of the pusher 62.
　また、図９（Ｂ）のとおり、位置決め部材６３の底板６３ｂに係合穴６５を設けている一方、プッシャー６２には係合穴６５に嵌まる係合爪６６が形成されており、係合爪６６が係合穴６５に引っ掛かることにより、位置決め部材６３は押動軸１８から離脱不能に保持されている。プッシャー６２の後面には、後ろ向きに開口した補助溝６２ｂが左右全長にわたって形成されている。補助溝６２ｂは、第１背フレーム１４を取り付けるに当たって、ベース２に形成した前向き支持片２ａに嵌め込むことで、第１背フレーム１４を仮保持するためのものである。なお、位置決め部材６３は押動軸１８に一体成形してもよいし、押動軸１８を成形（ダイキャストや鋳造）で製造してこれに押動部を一体に設けることも可能である。 Further, as shown in FIG. 9B, the engagement hole 65 is provided in the bottom plate 63b of the positioning member 63, while the pusher 62 is formed with an engagement claw 66 that fits into the engagement hole 65. When the claw 66 is caught in the engagement hole 65, the positioning member 63 is held so as not to be detached from the push shaft 18. On the rear surface of the pusher 62, an auxiliary groove 62b opened rearward is formed over the entire length of the left and right. The auxiliary groove 62b is for temporarily holding the first back frame 14 by fitting the front back support piece 2a formed in the base 2 when the first back frame 14 is attached. The positioning member 63 may be integrally formed with the push shaft 18, or the push shaft 18 may be manufactured by molding (die casting or casting), and the push portion may be provided integrally therewith.
　例えば図１３に示すように、第１ばね受け５３のうち支軸６０より後ろの部位には左右一対のガイド軸６７を左右外向きに突設している一方、支持ブラケット３８には、ガイド軸６７が移動自在に嵌まる円弧状のガイド穴６８を形成している。これにより、ばねユニット５０の回動ストロークが規制されている。 For example, as shown in FIG. 13, a pair of left and right guide shafts 67 project from the left and right outwards in a portion of the first spring receiver 53 behind the support shaft 60, while the support bracket 38 includes a guide shaft. An arcuate guide hole 68 into which 67 is movably fitted is formed. Thereby, the rotation stroke of the spring unit 50 is regulated.
　例えば図１２から理解できるように、操作軸５１には左右一対の周面カム７０が嵌まっている一方、ばねユニット５０を構成する第１ばね受け５３の左右両側面には、周面カム７０の外周面が当るカム受け部７１を突設している。図１０に明示するように、本実施形態では、周面カム７０には、回転軸心からの距離ｅ１～ｅ５が短い順に第１～第５の５つのカム面７０ａ～７０ｅを形成しており、このため、操作軸５１で周面カム７０を回転させるとばねユニット５０は５つの姿勢に変化し、第１軸１６から第２ばね受け５５までの間隔（スパン）が変化する。その結果、ロッキングに対する抵抗の大きさを５段階に調節することができる。 For example, as can be understood from FIG. 12, a pair of left and right peripheral cams 70 are fitted on the operation shaft 51, while the peripheral cams 70 are provided on both left and right sides of the first spring receiver 53 constituting the spring unit 50. A cam receiving portion 71 is provided in contact with the outer peripheral surface of the projection. As clearly shown in FIG. 10, in this embodiment, the circumferential cam 70 is formed with first to fifth five cam surfaces 70a to 70e in order of decreasing distances e1 to e5 from the rotation axis. Therefore, when the circumferential cam 70 is rotated by the operation shaft 51, the spring unit 50 changes to five postures, and the interval (span) from the first shaft 16 to the second spring receiver 55 changes. As a result, the resistance against rocking can be adjusted in five stages.
　左右の周面カム７０は筒状部を介して連結されて１つのカム部材７３に一体成形されており、カム部材７３に角形の操作軸５１を挿通することにより、操作軸５１と周面カム７０とが一体に回転するようになっている。例えば図１２や図１４に示すように、操作軸５１は左右の支持ブラケット３８に回転自在に保持されている。また、操作軸５１の一端部はベース２の外側に突出していてこれに摘まみ７４を装着している。また、操作軸５１の他端には抜け止めクリップ７５を装着している。例えば図１２（Ａ）に示すように、ベース２には操作軸５１が入り込む凹所７６を設けている。このため、操作軸５１の高さをできるだけ低くすることができる。 The left and right circumferential cams 70 are connected to each other via a cylindrical portion and are integrally formed with one cam member 73. By inserting the square operating shaft 51 into the cam member 73, the operating shaft 51 and the circumferential cam are inserted. 70 and rotate together. For example, as shown in FIGS. 12 and 14, the operation shaft 51 is rotatably held by the left and right support brackets 38. Further, one end portion of the operation shaft 51 protrudes to the outside of the base 2, and a knob 74 is attached thereto. A retaining clip 75 is attached to the other end of the operation shaft 51. For example, as shown in FIG. 12A, the base 2 is provided with a recess 76 into which the operation shaft 51 enters. For this reason, the height of the operating shaft 51 can be made as low as possible.
　例えば図１３に示すように、周面カム７０の内側には、姿勢保持用カム部７７が一体に形成されている。姿勢保持用カム部７７の外周には、軸心からの距離が周面カム７０のカム面７０ａ～７０ｅと逆の関係になっているカム面７７ａ～７７ｅが形成されている。姿勢保持用周面カム部７７は、周面カム７０より一回り小さい大きさに設定されている。 For example, as shown in FIG. 13, a posture holding cam portion 77 is integrally formed inside the circumferential cam 70. On the outer periphery of the posture holding cam portion 77, cam surfaces 77a to 77e whose distance from the axis is opposite to the cam surfaces 70a to 70e of the circumferential cam 70 are formed. The posture maintaining peripheral cam portion 77 is set to be slightly smaller than the peripheral cam 70.
　他方、姿勢保持体５２は金属板製であり、第１ばね受け５３の支軸６０に回動自在に嵌まっている。姿勢保持体５２は、姿勢保持用カム部７７に斜め上から当接する上当接部５２ａと、姿勢保持体５２のカム受け部７１の下方に位置するように後ろ向きに延びる下支持部５２ｂとを有しており、下支持部５２ｂの下端に支持片５２ｃを外向き突設し、支持片５２ｃで３個のゴム７８を支持している。ゴム７８は請求項に記載した弾性部の一例であり、カム受け部７１にはゴム７８を位置決めする穴７９が形成されている。なお、ゴム７８の個数は１個でも複数個でもよい。ゴム７８に代えてコイルばねを使用することも可能である。或いは、姿勢保持体５２にその一部として弾性部を一体に設けることも可能である。 On the other hand, the posture holding body 52 is made of a metal plate and is rotatably fitted to the support shaft 60 of the first spring receiver 53. The posture holding body 52 has an upper abutting portion 52a that abuts the posture holding cam portion 77 obliquely from above and a lower support portion 52b that extends rearward so as to be positioned below the cam receiving portion 71 of the posture holding body 52. In addition, a support piece 52c protrudes outward from the lower end of the lower support portion 52b, and the three rubbers 78 are supported by the support piece 52c. The rubber 78 is an example of an elastic portion described in claims, and a hole 79 for positioning the rubber 78 is formed in the cam receiving portion 71. The number of rubbers 78 may be one or more. It is also possible to use a coil spring instead of the rubber 78. Alternatively, it is possible to integrally provide an elastic portion as a part of the posture holding body 52.
　周面カム７０とカム受け部７１とが姿勢保持体５２によって上下から挟まれた状態になっており、このため、ばねユニット５０と周面カム７０とは離反不能に保持されている。従って、周面カム７０をどちらの方向に回転させてもばねユニット５０は回動する。 The circumferential cam 70 and the cam receiving portion 71 are sandwiched from above and below by the posture holding body 52, and therefore the spring unit 50 and the circumferential cam 70 are held inseparably. Therefore, the spring unit 50 rotates regardless of which direction the circumferential cam 70 is rotated.
　さて、図１３（Ｂ）に周面カム７０を表示しているが、周面カム７０を回転させると操作軸５１の軸心からカム受け部７１の上面までの間隔Ｅ１が変化すると共に、操作軸５１の軸心から姿勢保持用周面カム部７７までの距離Ｅ２も変化する。そして、操作軸５１をどのように回転させても（Ｅ１＋Ｅ２）の寸法が略一定になるように姿勢保持用周面カム部７７の形状を設定することにより、カム受け部７１の下面と姿勢保持体５２の支持片５２ｃとの間隔寸法Ｅ３も略一定に保持している。つまり、操作軸５１の回転によってばねユニット５０が回動すると、姿勢保持体５２もばねユニット５０の回動方向に回動するのであり、このため、ばねユニット５０の姿勢に関係なくＥ３の寸法が略一定に保持されるのである。 13B, the circumferential cam 70 is displayed. When the circumferential cam 70 is rotated, the interval E1 from the axis of the operation shaft 51 to the upper surface of the cam receiving portion 71 changes and the operation is performed. The distance E2 from the axis of the shaft 51 to the posture maintaining peripheral surface cam portion 77 also changes. Then, by setting the shape of the posture holding peripheral surface cam portion 77 so that the dimension of (E1 + E2) is substantially constant no matter how the operation shaft 51 is rotated, the lower surface of the cam receiving portion 71 and the posture holding are set. The distance E3 between the body 52 and the support piece 52c is also kept substantially constant. That is, when the spring unit 50 is rotated by the rotation of the operation shaft 51, the posture holding body 52 is also rotated in the rotation direction of the spring unit 50. Therefore, the dimension of E3 is independent of the posture of the spring unit 50. It is held almost constant.
　そして、周面カム７０のいずれかのカム面７０ａ～７０ｅがカム受け部７１に当接した状態では、ゴム７８は全く圧縮されていないか又は軽く圧縮されており、周面カム７０を回転させると、隣り合ったカム面の交差部であるコーナー部が乗り越えるに際して、カム受け部７１が押されてゴム７８が圧縮変形してからゴム７８の弾性復原力でカム受け部７１が戻り回動するという現象が生じ、これにより、使用者はカム受け部７１に当接するカム面が切り換わってロッキングに対する抵抗の大きさが切り替えられた事実を感触で把握できる。換言すると、弾力の切り替えに際して使用者は、回転抵抗の変化から手にクリック感を感じることができる。 When any one of the cam surfaces 70a to 70e of the circumferential cam 70 is in contact with the cam receiving portion 71, the rubber 78 is not compressed at all or is lightly compressed, and the circumferential cam 70 is rotated. When the corner portion that is the intersection of the adjacent cam surfaces gets over, the cam receiving portion 71 is pushed and the rubber 78 is compressed and deformed, and then the cam receiving portion 71 returns and rotates by the elastic restoring force of the rubber 78. As a result, the user can grasp by touch the fact that the cam surface that contacts the cam receiving portion 71 is switched and the magnitude of the resistance to locking is switched. In other words, when switching the elasticity, the user can feel a click feeling from the change of the rotational resistance.
　そして、周面カム７０の回転に際してカム受け部７１が下向きに押されることで、カム受け部７１の下面と姿勢保持体５２の支持片５２ｃとの間隔寸法はＥ４に小さくなるが、各段階において（Ｅ１＋Ｅ２）が略同じであることにより、Ｅ４はどの段階でも略同じ寸法に保持されている。このため、弾力をどの段階に切り替えるにおいてもゴム７８の圧縮変形量は略一定であり、従って、操作軸５１を回転操作するにおいて回転抵抗（或いはクリック感）は略一定に保持される。 When the cam 70 is pushed downward during the rotation of the circumferential cam 70, the distance between the lower surface of the cam receiver 71 and the support piece 52c of the posture holding body 52 is reduced to E4. Since (E1 + E2) is substantially the same, E4 is maintained at substantially the same size at any stage. For this reason, the amount of compression deformation of the rubber 78 is substantially constant regardless of the level of elasticity, and therefore the rotational resistance (or click feeling) is maintained substantially constant when the operation shaft 51 is rotated.
　(4).ロック装置
　次に、背もたれ４のロッキングを制御するロック装置を、主に図１４，１５を参照して説明する。ロック装置は、既述のとおりロック用ガスシリンダ２６を有している。ロック用ガスシリンダ２６は市販品であり、筒体２６ａとこれにスライド自在に嵌まったロッド２６ｂとを有している。本実施形態では、ロッド２６ｂは後ろ向きに突出しており、ロッド２６ｂの先端（後端）に樹脂製等のサポート部材８０を取り付け、サポート部材８０を第３軸３２に嵌め込んでいる。　　　　　　　　　 (4). Locking device Next, a locking device for controlling the locking of the backrest 4 will be described mainly with reference to FIGS. The locking device has the locking gas cylinder 26 as described above. The locking gas cylinder 26 is a commercially available product, and has a cylindrical body 26a and a rod 26b slidably fitted on the cylindrical body 26a. In the present embodiment, the rod 26 b protrudes rearward, a support member 80 made of resin or the like is attached to the tip (rear end) of the rod 26 b, and the support member 80 is fitted on the third shaft 32.
　サポート部材８０には、第３軸３２が嵌まる取り付け溝８１が略上向きに開口した状態に形成されている。従って、図１５（Ｂ）に示すように、ロック用ガスシリンダ２６は、取り付け溝８１を略下向きに開口するように起こした姿勢にしてからサポート部材８０を第３軸３２に嵌め込み、次いで、筒体２６ａが手前に向かうように姿勢を変えることにより、第３軸３２にワンタッチ的に取り付けることができる。ロック用ガスシリンダ２６の取り付けは、中間金具５をベース２に取り付けた状態で行われる。そこで、ベース２にはロック用ガスシリンダ２６を上から嵌め可能な穴８２が空いている。 In the support member 80, a mounting groove 81 into which the third shaft 32 is fitted is formed in a state of opening substantially upward. Accordingly, as shown in FIG. 15 (B), the locking gas cylinder 26 is fitted into the third shaft 32 after the mounting groove 81 is raised so as to open substantially downward, and then the cylinder By changing the posture so that the body 26a is directed toward the front, it can be attached to the third shaft 32 in a one-touch manner. The lock gas cylinder 26 is attached in a state where the intermediate fitting 5 is attached to the base 2. Therefore, the base 2 has a hole 82 into which the lock gas cylinder 26 can be fitted from above.
　図９（Ａ）に示すように、ロック用ガスシリンダ２６を所定姿勢にセットした状態では、サポート部材８０はベースブラケット３０で落下不能に保持されている。従って、ロック用ガスシリンダ２６は離脱不能に保持されている。図１５（Ｂ）に示すように、サポート部材８０には、ロック用ガスシリンダ２６のプッシュバルブ８３を操作するためのレバー片８４が下方から嵌め込まれている。レバー片８４の下端には支軸部８５が形成されており、支軸部８５はサポート部材８０に設けた軸受け溝８６に嵌まっている。図９（Ａ）に示すように、サポート部材８０の上端前部に索導管８７の一端部を固定し、索導管８７に挿通されたワイヤー８８の一端に固定した球８９をレバー片８４の上端部に掛け止めしている。図１６（Ｂ）に示すように、レバー片８４には、球８９を嵌め込んでから上向き移動させ得る係合溝９０が形成されている。 As shown in FIG. 9A, the support member 80 is held by the base bracket 30 so as not to drop when the locking gas cylinder 26 is set in a predetermined posture. Therefore, the lock gas cylinder 26 is held so as not to be detached. As shown in FIG. 15B, a lever piece 84 for operating the push valve 83 of the locking gas cylinder 26 is fitted into the support member 80 from below. A support shaft portion 85 is formed at the lower end of the lever piece 84, and the support shaft portion 85 is fitted in a bearing groove 86 provided in the support member 80. As shown in FIG. 9A, one end portion of the cable conduit 87 is fixed to the front end of the upper end of the support member 80, and a ball 89 fixed to one end of the wire 88 inserted through the cable conduit 87 is connected to the upper end of the lever piece 84. It is hung on the part. As shown in FIG. 16B, the lever piece 84 is formed with an engagement groove 90 that can be moved upward after the ball 89 is fitted.
　索導管８７の他端は固定アウターシェル９の左側部又は右側部に連結されており、ワイヤー８８の他端は手動式操作レバー（図示せず）に連結されている。操作レバーはロック姿勢とフリー姿勢とに選択的に保持されるようになっている。図９（Ａ）では操作レバーはロック姿勢になっており、この状態では背もたれ４は傾動不能に保持されている。図９の状態から操作レバーをフリー姿勢に回動させると、レバー片８４はその上端が手前に移動するように回動し、これによってプッシュパルブ８３が押されてロック用ガスシリンダ２６は伸縮自在なフリー状態になる。従って、背もたれ４は傾動自在になる。 The other end of the cable conduit 87 is connected to the left side or the right side of the fixed outer shell 9, and the other end of the wire 88 is connected to a manual operation lever (not shown). The operation lever is selectively held between a locked posture and a free posture. In FIG. 9A, the operation lever is in a locked posture, and in this state, the backrest 4 is held so as not to tilt. When the operating lever is turned to the free posture from the state shown in FIG. 9, the lever piece 84 is turned so that the upper end of the lever piece 84 is moved forward, thereby pushing the push valve 83 and the locking gas cylinder 26 is telescopic. It becomes a free state. Therefore, the backrest 4 can be tilted freely.
　ロック用ガスシリンダ２６の前端部には左右横長の第４軸９１が取り付けられており、この第４軸９１は、左右の底板と左右の側板９２ａとフラップ片９２ｂとを有するピン受け部材９２に上から嵌め込み保持されている。すなわち、ピン受け部材９２のフラップ片９２ｂは側板９２ａの上端から外向きに突出しており、フラップ片９２ｂと側板９２ａとに切り開き形成したピン受け溝９３に、第４軸９１が上から嵌め込まれている。ピン受け部材９２のフラップ片９２ｂは中間金具５の下面にビス９４で固定されている。 A horizontally long fourth shaft 91 is attached to the front end portion of the locking gas cylinder 26. The fourth shaft 91 is attached to a pin receiving member 92 having left and right bottom plates, left and right side plates 92a, and a flap piece 92b. It is fitted and held from above. That is, the flap piece 92b of the pin receiving member 92 protrudes outward from the upper end of the side plate 92a, and the fourth shaft 91 is fitted from above into the pin receiving groove 93 formed by opening the flap piece 92b and the side plate 92a. Yes. The flap piece 92b of the pin receiving member 92 is fixed to the lower surface of the intermediate fitting 5 with screws 94.
　第４軸９１は、中間金具５に手前から差し込み装着したストッパー９５で上向き抜け不能及び左右抜け不能に保持されている。このストッパー９５は樹脂製であり、前板から後ろ向きに延びる左右の足体９５ａを有している。図１５（Ａ）（Ｂ）に示すように、左右の足体９５ａは第４軸９１の左右端部を外側と上側とから囲うように背面視Ｌ形に形成されており、左右の足体９５ａにより、第４軸９１は上向きに抜け不能でかつ左右方向にも抜け不能に保持されている。 The fourth shaft 91 is held so that it cannot be pulled out upward and left and right by a stopper 95 inserted and attached to the intermediate bracket 5 from the front. The stopper 95 is made of resin and has left and right feet 95a extending rearward from the front plate. As shown in FIGS. 15 (A) and 15 (B), the left and right foot bodies 95a are formed in an L shape in rear view so as to surround the left and right ends of the fourth shaft 91 from the outside and the upper side. Due to 95a, the fourth shaft 91 is held so as not to be able to come out upward and in the left-right direction.
　中間金具５の前端には前板５ｃが形成されており、この前板５ｃに、ストッパー９５の足体９５ａが貫通する取り付け穴９７を設けている。足体９５ａは中間金具５の下面に重なっている。このため、第４軸９１に上向きの外力が掛かっても曲がり変形することはない。図１５（Ｃ）から明瞭に把握できるように、ストッパー９５における前板の下端には、左右２つの係合爪９８を後ろ向きに突設している。係合爪９８の先端（後端）は上向き鉤状になっており、この係合爪９８を中間金具５の前板５ｃに下方から掛け止めている。言うまでもないが、係合爪９８はその弾性に抗して変形してから中間金具５の前板５ｃに引っ掛かる。このため、ストッパー９５は離脱不能に保持される。 A front plate 5c is formed at the front end of the intermediate fitting 5, and a mounting hole 97 through which the foot body 95a of the stopper 95 passes is provided in the front plate 5c. The foot body 95 a overlaps the lower surface of the intermediate metal fitting 5. For this reason, even if an upward external force is applied to the fourth shaft 91, it does not bend and deform. As can be clearly seen from FIG. 15C, two left and right engaging claws 98 project rearwardly at the lower end of the front plate of the stopper 95. The front end (rear end) of the engaging claw 98 has an upward hook shape, and the engaging claw 98 is hooked on the front plate 5c of the intermediate metal fitting 5 from below. Needless to say, the engaging claw 98 is deformed against its elasticity and then caught on the front plate 5 c of the intermediate metal fitting 5. For this reason, the stopper 95 is held so as not to be detached.
　さて、ロッキング姿勢の制御手段としてガスシリンダを使用することは、従来から広く行われている（例えば、実用新案登録第２５５５４９８号公報）。ガスシリンダは筒体とこれに嵌まったピストンロッド（プランジャ）とからなっており、ピストンロッドの一端に突出したプッシュバルブを押し操作することでロックが解除される。そして、一般に、筒体の基端をピンでベース等に回動可能に連結する一方、ピストンロッドの先端は背もたれ側等にナットで固定したりしているが、ピンの挿通やナットによる締結などの作業が面倒であった。 Now, the use of a gas cylinder as a means for controlling a rocking posture has been widely performed (for example, Utility Model Registration No. 2555498). The gas cylinder is composed of a cylindrical body and a piston rod (plunger) fitted thereto, and the lock is released by pushing a push valve protruding from one end of the piston rod. In general, the base end of the cylindrical body is pivotally connected to the base or the like with a pin, while the tip of the piston rod is fixed to the backrest side with a nut or the like. The work of was troublesome.
　本実施形態のロック装置はこの問題を解消するものであり、サポート部材８０を第３軸３２に嵌め入れから、第４軸９１をフラップ片９２ｂ及び側板９２ａのピン受け溝９３に嵌め込むワンタッチ的な作業により、ロック用ガスシリンダ２６を簡単に取り付けることができる。 The locking device according to the present embodiment solves this problem. One-touch type, in which the support member 80 is fitted into the third shaft 32 and the fourth shaft 91 is fitted into the pin receiving groove 93 of the flap piece 92b and the side plate 92a. With this operation, the lock gas cylinder 26 can be easily attached.
　(5).まとめ
　ロッキングに際しては、プッシャー６２が前進動して第２ばね受け５５が押され、これにより、ロッキングに対する抵抗が付与される。そして、操作軸５１を回転操作して周面カム７０を回転させることにより、ロッキングに対する抵抗の度合いを複数段階（５段階）に切り替えできる。敢えて述べるまでもないが、弾力調節の切り替え段数は５段階には限らず、任意の段数に設定できる。 (5) Summary At the time of locking, the pusher 62 moves forward and the second spring receiver 55 is pushed, thereby providing resistance to locking. Then, by rotating the operating shaft 51 to rotate the circumferential cam 70, the degree of resistance to rocking can be switched to a plurality of levels (five levels). Needless to say, the number of switching steps of the elasticity adjustment is not limited to five, and can be set to an arbitrary number.
　プッシャー６２は押動軸１８に一体成形することも可能であるが、本実施形態のようにプッシャー６２を押動軸１８とは別体に構成すると、プッシャー６２を第１背フレーム１４とは異なる素材にしてプッシャー６２の機能を向上できる利点や、プッシャー６２が磨耗等したら簡単に交換できる利点がある。より具体的には、例えば第１背フレーム１４及び押動軸１８をアルミダイキャスト製の一体成形品とし、プッシャー６２を強度や耐摩耗性に優れた樹脂（例えばナイロン系の樹脂やポリアセタールなど）で製造することも、好ましい態様である。尚、プッシャー６２を強度面や耐摩耗性に優れた素材で形成することで、ライニング材の装着を不要とすることも可能である。 The pusher 62 can be integrally formed with the push shaft 18. However, if the pusher 62 is configured separately from the push shaft 18 as in this embodiment, the pusher 62 is different from the first back frame 14. There is an advantage that the function of the pusher 62 can be improved as a material, and an advantage that it can be easily replaced if the pusher 62 is worn. More specifically, for example, the first back frame 14 and the push shaft 18 are integrally formed from an aluminum die cast, and the pusher 62 is a resin excellent in strength and wear resistance (for example, nylon-based resin or polyacetal). It is also a preferable aspect to manufacture by. In addition, it is possible to eliminate the need for the lining material by forming the pusher 62 with a material excellent in strength and wear resistance.
　本実施形態では、図１０（Ａ）から理解できるように、ロック用ガスシリンダ２６の支軸である第３軸３２が第１軸１６と第２軸２５との間の高さ位置に配置されていることと、ロッキングしても第４軸９１の高さはさほど変わらないこととにより、ロッキングに伴ってロック用ガスシリンダ２６に作用する荷重の作用線は、ロック用ガスシリンダ２６の軸心に近接した姿勢になっている。このため、ロック用ガスシリンダ２６の能力（弾性復原力）を、背もたれ４の後傾動に対する抵抗としてフルに発揮させることができる。また、ロック用ガスシリンダ２６の耐久性も向上できる。 In this embodiment, as can be understood from FIG. 10A, the third shaft 32 that is a support shaft of the locking gas cylinder 26 is disposed at a height position between the first shaft 16 and the second shaft 25. And the fact that the height of the fourth shaft 91 does not change much even when locked, the line of action of the load acting on the locking gas cylinder 26 along with locking is the axis of the locking gas cylinder 26. The posture is close to. For this reason, the capability (elastic restoring force) of the locking gas cylinder 26 can be fully exhibited as a resistance against the backward tilting of the backrest 4. Further, the durability of the lock gas cylinder 26 can be improved.
　本実施形態では、ばねユニット５０や支持ブラケット３８、カム部材７３付きの操作軸５１を一つの固まりの弾力調節ユニット２３に構成されているため、保管や組み立ての手間を抑制できると共に、組み立て誤差のバラ付きをなくして精度アップにも貢献できる利点がある。 In the present embodiment, since the spring unit 50, the support bracket 38, and the operation shaft 51 with the cam member 73 are configured as one elastic adjustment unit 23, the labor of storage and assembly can be suppressed, and an assembly error can be reduced. There is an advantage that it can contribute to the improvement of accuracy by eliminating the variation.
　なお、支持機構部の組み立ては次の手順で行われる。すなわち、予め押動軸１８にプッシャー６２を嵌め込み装着しておいて、第１背フレーム１４をベース２にセットする、弾力調節ユニット２３をベース２にセットする、スライダ４４を装着して固定する、中間金具５の前部をスライダ４４に後ろから差し込む、第２軸２５で中間金具５と第１背フレーム１４とを連結する、ロック用ガスシリンダ２６をセットする、ストッパー９５を中間金具５に装着する、という手順で行われる。ピン受け部材９２は予め中間金具５に固
している。本実施形態ではビス止め箇所は僅かであるため、椅子の組み立てを能率良くしかも高い精度で行える利点がある。 In addition, assembly of a support mechanism part is performed in the following procedure. That is, the pusher 62 is fitted in and attached to the push shaft 18 in advance, the first back frame 14 is set on the base 2, the elasticity adjusting unit 23 is set on the base 2, and the slider 44 is attached and fixed. Insert the front part of the intermediate metal part 5 into the slider 44 from behind, connect the intermediate metal part 5 and the first back frame 14 with the second shaft 25, set the locking gas cylinder 26, and attach the stopper 95 to the intermediate metal part 5. The procedure is to do. The pin receiving member 92 is fixed to the intermediate metal fitting 5 in advance. In this embodiment, since there are few screwing places, there exists an advantage which can assemble a chair efficiently and with high precision.
　(6).第２実施形態
　次に、図１６，１７に示す第２実施形態を説明する。この実施形態は弾力調節ユニット２３の変形例であり、第１実施形態との大きな相違点は、周面カム７０とばねユニット５０とを常に重なった状態に保持する姿勢保持手段の構成が相違する点である。 (6). Second Embodiment Next, a second embodiment shown in FIGS. 16 and 17 will be described. This embodiment is a modification of the elasticity adjusting unit 23, and the major difference from the first embodiment is that the configuration of the posture holding means for holding the circumferential cam 70 and the spring unit 50 in an overlapped state is different. Is a point.
　この第２実施形態では、姿勢保持体５２は樹脂製であり、左右の姿勢保持体５２をジョイント１００で連結すると共に、左右姿勢保持体５２に、請求項に記載した弾性部の一例として、筒状部材５１のカム受け部７１に突設したガイド突条７１ａに下から当接するばね部１０１を一体に設けている。ばね部１０１は細い線状で側面視上向き凸の山形に形成されている。従って、ばね部１０１が撓み変形することで周面カム７０の回転が許容される。本実施形態ではばね部１０１が姿勢保持体５２に一体成形されているため、部材点数の削減によるコスト抑制や組み立て作業性アップに貢献できる。 In the second embodiment, the posture holding body 52 is made of resin, and the left and right posture holding bodies 52 are connected by the joint 100, and the left and right posture holding body 52 is connected to the cylinder as an example of the elastic portion described in the claims. A spring portion 101 that comes into contact with the guide protrusion 71a protruding from the cam receiving portion 71 of the member 51 is provided integrally. The spring portion 101 is formed in a mountain shape that is thin and has a convex shape upward in a side view. Therefore, the rotation of the circumferential cam 70 is allowed by the bending and deformation of the spring portion 101. In this embodiment, since the spring part 101 is integrally formed with the attitude | position holding body 52, it can contribute to the cost suppression by reduction of a member number, and an assembly workability improvement.
　ジョイント１００は左右の姿勢保持体５２を一体に繋ぐためのものであり、平面視では前向き凸の山形に形成されている。このため、ジョイント１００を左右方向に伸ばすように変形させることにより、左右姿勢保持体５２の間隔を拡げることがきる。その結果、左右の姿勢保持体５２は一体成形されたものでありながら、第１ばね受け５３の支軸６０に嵌め込むことができる。 The joint 100 is used to integrally connect the left and right posture holding bodies 52, and is formed in a forward convex mountain shape in plan view. For this reason, the space | interval of the left-right attitude | position holding body 52 can be expanded by deform | transforming the joint 100 so that it may extend in the left-right direction. As a result, the left and right posture holding bodies 52 can be fitted into the support shaft 60 of the first spring receiver 53 while being integrally molded.
　いうまでもないが、左右の姿勢保持体５２は分離していても良いし、一体成形せずに別体のジョイントで連結することも可能である。なお、支持ブラケット３８には前向きに突出した角部３８ａを設けており、角部３８ａには第１軸１６が嵌まる軸受け穴１０２を空けている。 Needless to say, the left and right posture holding bodies 52 may be separated or connected by separate joints without being integrally formed. The support bracket 38 is provided with a corner portion 38a projecting forward, and a bearing hole 102 into which the first shaft 16 is fitted is formed in the corner portion 38a.
　ばねユニット５０はプッシャー６２で押されると上向き回動する傾向を呈することが有り、このため支持ブラケット３８もその後部が浮く傾向を呈することがあるが、本実施形態のように角部３８ａを第１軸１６に嵌め込んでいると、支持ブラケット３８の浮きを簡単な構造で確実に防止できる。図１８（Ｂ）に示すように、支持ブラケット３８の後部下端には、ベース２に設けた係合穴（図示せず）に嵌まる鉤片３８ａを形成しており、この鉤片３８ａによっても浮きを防止している。図１７（Ｂ）から理解できるように、第２ばね受け５５と第１ばね受け５３とを連結するピン５８は姿勢保持体５２で左右抜け不能に保持されている。 When the spring unit 50 is pushed by the pusher 62, the spring unit 50 may tend to rotate upward. For this reason, the support bracket 38 may also tend to float at its rear part. If it fits in the 1 axis | shaft 16, the floating of the support bracket 38 can be prevented reliably with a simple structure. As shown in FIG. 18B, a collar 38a that fits into an engagement hole (not shown) provided in the base 2 is formed at the lower end of the rear portion of the support bracket 38. Prevents floating. As can be understood from FIG. 17B, the pin 58 that connects the second spring receiver 55 and the first spring receiver 53 is held by the posture holding body 52 so that it cannot be removed from the left and right.
　第１実施形態では、ばねユニット５０の回動ストローク規制手段として支持ブラケット３８に円弧状のガイド穴６８を形成していたが、本実施形態では、周面カム７０によって回動ストロークを規制している。すなわち、図１３（Ｂ）も参照して説明すると、第１カム面７０ａと第５カム面７０ｅとの間コーナー部を便宜的にエンドコーナーと称した場合、第１カム面７０ａの高さ（回転軸心からの寸法）とエンドコーナー部の高さとの差をＥ３の寸法より大きい寸法に設定すると共に、第５カム面７０ｅの高さとエンドコーナー部の高さとの差をＥ３の寸法より大きい寸法に設定することにより、第１カム面７０ａから第５カム面７０ｅに移行させようとしたり、第５カム面７０ｅから第１カム面７０ａに移行させようとしたりしても、周面カム７０のエンドコーナー部がカム受け部７１につかえて回転できないようにしている。このため構造が簡単になる。もとより、第１実施形態と同様に長穴等のストローク規制手段を別に設けてもよい。 In the first embodiment, the arcuate guide hole 68 is formed in the support bracket 38 as the rotation stroke restricting means of the spring unit 50. However, in this embodiment, the rotation stroke is restricted by the circumferential cam 70. Yes. That is, with reference to FIG. 13B as well, when a corner portion between the first cam surface 70a and the fifth cam surface 70e is referred to as an end corner for convenience, the height of the first cam surface 70a ( The difference between the height from the rotation axis) and the height of the end corner is set to a size larger than the size of E3, and the difference between the height of the fifth cam surface 70e and the height of the end corner is larger than the size of E3. By setting the dimensions, the peripheral cam 70 can be moved from the first cam surface 70a to the fifth cam surface 70e or from the fifth cam surface 70e to the first cam surface 70a. The end corner portion of this is held by the cam receiving portion 71 so that it cannot be rotated. This simplifies the structure. Of course, similarly to the first embodiment, a stroke restricting means such as a long hole may be provided separately.
　(7).他の実施形態・その他
　図１８では他の実施形態を模式的に表示している。このうち（Ａ）に示す第３実施形態では、ばねユニット５０をその軸心と直交した方向にスライドさせることで押動部１０３からのモーメントを変えるものに適用している。すなわち、この実施形態は、ばねユニット５０全体を周面カム７０で横スライドさせることで、弾力調節が行われる。 (7) Other Embodiments / Others FIG. 18 schematically shows another embodiment. Of these, the third embodiment shown in FIG. 5A is applied to a configuration in which the moment from the pushing portion 103 is changed by sliding the spring unit 50 in a direction perpendicular to the axis. That is, in this embodiment, the elasticity is adjusted by sliding the entire spring unit 50 sideways with the circumferential cam 70.
　図１８（Ｂ）に示す第４実施形態では、ばねユニット５０は位置及び姿勢が固定されていて単に伸縮するに過ぎない。そして、第２ばね受け５５と押動部１０３との間に、第２ばね受け５５に当たる中間回動体１０４と、押動部１０３の荷重を中間回動体１０４に伝達するスライド体１０５とを配置しており、スライド体１０５をばねユニット５０の軸心と直交した方向にスライドさせることでモーメントを変えている。そして、図示していないが、スライド体１０５を周面カムで移動させる。本願発明はこのようなタイプにも適用できる。この実施形態の場合、ロッキング用ばね手段としては板ばねやトーションバーなども使用可能である。 In the fourth embodiment shown in FIG. 18 (B), the spring unit 50 is fixed in position and posture, and simply expands and contracts. Between the second spring receiver 55 and the pressing portion 103, an intermediate rotating body 104 that hits the second spring receiver 55 and a slide body 105 that transmits the load of the pressing portion 103 to the intermediate rotating body 104 are arranged. The moment is changed by sliding the slide body 105 in a direction perpendicular to the axis of the spring unit 50. Although not shown, the slide body 105 is moved by the circumferential cam. The present invention can also be applied to such a type. In this embodiment, a plate spring, a torsion bar, or the like can be used as the locking spring means.
　図１８（Ｃ）に示す第５実施形態はばねの保持構造の別例である。この実施形態では、ベース２に回動自在に連結された固定ばね受け１０６に筒体１０７を設ける一方、押動部（図示せず）の荷重を受ける可動ばね受け１０８には筒体１０７にスライド自在に嵌まる内軸１０９を設けて、筒体１０７と内軸１０９とに圧縮コイルばね１１０を外側から嵌めている。従って、圧縮コイルばね１１０は露出している。そして、この実施形態では、可動ばね受け１０８を周面カムで押すことにより、ばねユニット５０の姿勢が変化する。なお、固定ばね受け１０６と可動ばね受け１０８とはボルト等の抜け止め手段で抜け不能に保持している。 The fifth embodiment shown in FIG. 18C is another example of a spring holding structure. In this embodiment, a cylindrical body 107 is provided on a fixed spring receiver 106 that is rotatably connected to the base 2, while a movable spring receiver 108 that receives a load of a pushing portion (not shown) slides on the cylindrical body 107. An inner shaft 109 that fits freely is provided, and a compression coil spring 110 is fitted to the cylinder body 107 and the inner shaft 109 from the outside. Therefore, the compression coil spring 110 is exposed. In this embodiment, the posture of the spring unit 50 is changed by pressing the movable spring receiver 108 with the circumferential cam. Note that the fixed spring receiver 106 and the movable spring receiver 108 are held so as not to be detached by a retaining means such as a bolt.
　本願発明は上記の実施形態の他にも様々に具体化できる。例えば、適用対象は移動自在な回転椅子には限らず、劇場用椅子のような固定式の椅子にも適用できる。ベース等の構成部材は必要に応じて各種の形態を採用できる。カムは必ずしも周面カムには限らず、端面カムや溝形カムなども採用できる。カムとばね手段とを離反不能に保持する手段としては、単にばねで引っ張るといったことも可能である。 The present invention can be embodied in various ways other than the above-described embodiment. For example, the application target is not limited to a movable swivel chair, but can also be applied to a fixed chair such as a theater chair. Various forms can be adopted as necessary for the structural member such as the base. The cam is not necessarily limited to the circumferential cam, and an end face cam, a grooved cam, or the like can also be employed. As a means for holding the cam and the spring means so as not to be separated, it is possible to simply pull the cam and the spring means with a spring.
　ばねユニットの連結部としては、第１ばね受けと第２ばね受けとのいずれか一方にピン穴を設けることも可能である。ばねユニットにおいて、第１ばね受けと第２ばね受けとは伸縮することは必須条件であるが、ばねは外部に露出していてもよい。 As a connecting portion of the spring unit, it is possible to provide a pin hole in one of the first spring receiver and the second spring receiver. In the spring unit, expansion and contraction of the first spring receiver and the second spring receiver is an essential condition, but the spring may be exposed to the outside.
　(8).座の背景技術と本例の特徴
　次に、座とその支持機構部の詳細を説明する。さて、椅子において、座の前後長さ（前端の奥行き）を調節する技術として、座の前部を下側に巻き込む方式が提案されている（例えば特公平０7 －７７５６７号公報）。この従来技術では、座の前部を変形許容部と成して、変形許容部の前端を左右横長のフロントバーに固定し、フロントバーを前後動させることで変形許容部を巻き込んだり伸ばしたりしている。フロントバーの左右両端部には後ろ向きに延びるサイドバーが固定されており、サイドバーは受け部材で前後スライド自在に支持されている。 (8). Background Art of Seat and Features of This Example Next, details of the seat and its support mechanism will be described. In the chair, as a technique for adjusting the longitudinal length of the seat (depth of the front end), a method of winding the front portion of the seat downward has been proposed (for example, Japanese Patent Publication No. 07-77567). In this prior art, the front part of the seat is formed as a deformation-permitting part, the front end of the deformation-permitting part is fixed to a horizontally long front bar, and the deformation-permitting part is rolled up or extended by moving the front bar back and forth. ing. Side bars extending rearward are fixed to the left and right ends of the front bar, and the side bars are supported by a receiving member so as to be slidable back and forth.
　座の前後長さを調節する操作方法としては、人が手で座の前端部に掴んで前後に押し引きしたり、或いは、別に設けた操作具でサイドバーを前後動させたりすることになるが、人が着座した状態では人の体圧がサイドバーに掛かることにより、着座した状態のままで前後長さを調節しにくくなり、そこで、座の前後長さを変えるに当たっては腰を浮かせた状態にせねばならないことがあり、このため座の前後長さの調節（奥行き調節）が面倒であるという問題があった。本願は、このような現状を改善した椅子の提供している。 As an operation method for adjusting the front / rear length of the seat, a person grasps the front end of the seat with his / her hand and pushes / pulls forward / backward, or moves the sidebar back and forth with a separate operation tool. However, when the person is seated, the body pressure is applied to the sidebar, making it difficult to adjust the front and back length while sitting, so the waist was lifted when changing the front and back length of the seat. Therefore, there is a problem that adjustment of the length of the seat (depth adjustment) is troublesome. The present application provides a chair that improves such a current situation.
　本願に開示された椅子は、座部と椅子とを含んでおり、座部は、クッションを張った座インナーシェルと、前記座インナーシェルを下から支持する座アウターシェルとを有しており、前記座インナーシェルの前部を下向きに巻き込み可能な変形許容部と成すことで前後長さを調節可能である、という基本構成を有する。 The chair disclosed in the present application includes a seat and a chair, and the seat includes a seat inner shell having a cushion and a seat outer shell that supports the seat inner shell from below. It has a basic configuration in which the front and rear lengths can be adjusted by forming the front portion of the seat inner shell as a deformation allowing portion that can be wound downward.
　そして、上記基本構成において、前記座アウターシェルは、当該固定アウターシェルの少なくとも後ろ側半分を構成する固定アウターシェルと、前記固定アウターシェルの手前に突出した部分を有するスライドアウターシェルとで構成されており、前記スライドアウターシェルは前記固定アウターシェルに前後動自在に取り付けられており、前記スライドアウターシェルの前端部に前記座インナーシェルの前端部を連結することにより、前記座インナーシェルの前部が下向きに巻き込まれることを可能ならしめている。 In the basic configuration, the seat outer shell includes a fixed outer shell that forms at least a rear half of the fixed outer shell, and a slide outer shell that has a portion protruding in front of the fixed outer shell. The slide outer shell is attached to the fixed outer shell so as to be movable back and forth, and by connecting the front end portion of the seat inner shell to the front end portion of the slide outer shell, the front portion of the seat inner shell is It makes it possible to get caught down.
　更に、前記スライドアウターシェルは、前記座インナーシェルを広い範囲にわたって支持し得るように面的な広がりを持っており、着座者の体圧が主として前記固定アウターシェルで支持した状態で、前記座インナーシェルの下向き押圧力が前記スライドアウターシェルに殆どかからないように設定している。 Further, the slide outer shell has a planar spread so that the seat inner shell can be supported over a wide range, and the seat inner body is mainly supported by the stationary outer shell while the body pressure of the seated person is supported by the seat outer shell. The downward pressing force of the shell is set so as not to be applied to the slide outer shell.
　本願で開示された発明では、スライドアウターを前後動させることで座の前後長さが変わるが、固定アウターシェルは少なくとも後ろ半分を構成しているため、例えば背中を背もたれに当てた通常の着座状態で、着座した人の体圧の大部分を固定アウターシェルで支持できる。そして、着座者の体圧を主として前記固定アウターシェルで支持した状態で座インナーシェルでスライドアウターシェルが上から押圧されることはないため、人が普通に腰掛けた状態ではスライドアウターシェルに荷重が作用することは全く又は殆どなく、その結果、着座した状態のままで座の前後長さを調節することができる。このため、操作性に優れていてユーザーフレンドリーである。 In the invention disclosed in the present application, the longitudinal length of the seat changes by moving the slide outer back and forth, but since the fixed outer shell constitutes at least the rear half, for example, a normal sitting state with the back against the backrest Thus, most of the body pressure of the seated person can be supported by the fixed outer shell. Since the slide outer shell is not pressed from above by the seat inner shell while the body pressure of the seated person is mainly supported by the fixed outer shell, a load is applied to the slide outer shell when a person normally sits down. There is little or no effect, and as a result, the longitudinal length of the seat can be adjusted while seated. For this reason, it is excellent in operability and user-friendly.
　また、本願発明では、スライドアウターシェルは面的な広がりを持っているため、着座者の体圧が座の前部に作用しても、座インナーシェルは過度に変形することなくスライドアウターシェルでしっかりと支持される。このため、支持強度に優れている。また、座インナーシェルが着座した人の体圧で沈み込んでスライドアウターシェルに当たった場合、座インナーシェルはスライドアウターシェルによって広い面積で支持されるため、座インナーシェルが局部的に大きく変形して人の大腿部に突き上げ感を与えるような不具合はなく、このため座り心地に優れている。つまり、強度や座り心地を犠牲にすることなく座の前後長さを調節できる。 Further, in the present invention, the slide outer shell has a wide area, so that even if the body pressure of the seated person acts on the front part of the seat, the seat inner shell does not deform excessively. Firmly supported. For this reason, it is excellent in support strength. In addition, when the seat inner shell sinks due to the body pressure of the seated person and hits the slide outer shell, the seat inner shell is supported by a wide area by the slide outer shell, so the seat inner shell is greatly deformed locally. Therefore, there is no problem that gives a feeling of pushing up to a person's thigh, so that the sitting comfort is excellent. In other words, the longitudinal length of the seat can be adjusted without sacrificing strength or sitting comfort.
　(9).座インナーシェル
　座インナーシェル７はＰＰ等の樹脂を材料にした成形品であり、例えば図２０，２１に明示するように、着座者の体圧が強く作用するメイン支持部７ａと、メイン支持部７ａの後ろに位置したリア支持部７ｂと、メイン支持部７ａの手前に位置した既述の変形許容部７ｃとで構成されている。大雑把には、メイン支持部７ａは前後長さのうちの半分弱を占め、リア支持部７ｂと変形許容部７ｃとは１／４強程度の範囲を占めている。 (9). Seat Inner Shell The seat inner shell 7 is a molded product made of a resin such as PP. For example, as clearly shown in FIGS. The rear support portion 7b positioned behind the main support portion 7a and the above-described deformation allowing portion 7c positioned in front of the main support portion 7a. Roughly speaking, the main support portion 7a occupies a little less than half of the longitudinal length, and the rear support portion 7b and the deformation allowance portion 7c occupy a range of about a quarter or more.
　座インナーシェル７のメイン支持部７ａには、多数の中間スリット１１２が形成されている。かつ、メイン支持部７ａとリア支持部７ｂとは左右側部のみが連結されていて両者の間には左右横長の抜き溝１１３が形成されている。このため、メイン支持部７ａは着座者の体圧で下向きに伸び変形することが許容されている。 A number of intermediate slits 112 are formed in the main support portion 7 a of the seat inner shell 7. Further, only the left and right side portions of the main support portion 7a and the rear support portion 7b are connected to each other, and left and right laterally elongated grooves 113 are formed therebetween. For this reason, the main support portion 7a is allowed to extend downward and deform with the body pressure of the seated person.
　座インナーシェル７の変形許容部７ｃには横長のフロントスリット１１４が左右方向に３列で前後方向に多列（多段）に形成されており、これらフロントスリット１１４の群の存在により、変形許容部７ｃは側面視で直線状に延びた姿勢から下向きに巻き込まれることが許容されている。 In the deformation permitting portion 7c of the seat inner shell 7, horizontally long front slits 114 are formed in three rows in the left-right direction and in multiple rows (multi-stage) in the front-rear direction. 7c is allowed to be wound downward from a posture extending linearly in a side view.
　変形許容部７ｃの左右中間部と左右端部とには、側面視逆Ｕ形のブリッジ部１１５が形成されており、フロントスリット１１４を挟んで前後に分断された帯板状の部分はブリッジ部１１５で繋がっている。この逆Ｕ形のブリッジ部１１５の存在により、変形許容部７ｃは前後方向に大きく引き伸ばすことが可能になるため、巻き込み変形させることを抵抗なく確実に行える。 A laterally inverted U-shaped bridge portion 115 is formed at the left and right intermediate portion and the left and right end portions of the deformation allowing portion 7c, and the strip-like portion divided forward and backward across the front slit 114 is a bridge portion. Connected at 115. Due to the presence of the inverted U-shaped bridge portion 115, the deformation-permitting portion 7c can be greatly extended in the front-rear direction, so that it can be reliably entangled and deformed without resistance.
　(10). 座アウターシェル
　座アウターシェル６を構成する固定アウターシェル９とスライドアウターシェル１０とは、ＰＰ等の樹脂を素材にした成形品である。例えば図２１（Ａ）から理解できるように、固定アウターシェル９の前端は座インナーシェル７における変形許容部７ｃの後部まで伸びている（なお、図２１（Ａ）ではスリットは省略している。）。固定アウターシェル９の上面には剛性を高めるために多数のリブを形成している。固定アウターシェル９には、座インナーシェル７のメイン支持部７ａが大きく沈み込むことを許容する抜き穴１１６が形成されている。 (10). Seat outer shell The fixed outer shell 9 and the slide outer shell 10 constituting the seat outer shell 6 are molded products made of a resin such as PP. For example, as can be understood from FIG. 21A, the front end of the fixed outer shell 9 extends to the rear portion of the deformation allowing portion 7c in the seat inner shell 7 (note that the slit is omitted in FIG. 21A). ). A large number of ribs are formed on the upper surface of the fixed outer shell 9 in order to increase rigidity. The fixed outer shell 9 is formed with a hole 116 that allows the main support portion 7a of the seat inner shell 7 to sink greatly.
　例えば図６に示すように、スライドアウターシェル１０は、固定アウターシェル９と略同じ左右横幅で面的な広がりを持つ基部１０ａと、基部１０ａの左右両側部から後ろ向きに突出したアーム部１０ｂとを有している。基部１０ａは前進させ切った状態でも後部は常に固定アウターシェル９に上から重なっており、後退させ切ると、基部１０ａの殆ど全体が固定アウターシェル９に重なる。アーム部１０ｂは、常に固定アウターシェル９に上から重なっている。 For example, as shown in FIG. 6, the slide outer shell 10 includes a base portion 10 a having substantially the same lateral width as the fixed outer shell 9 and a planar spread, and arm portions 10 b protruding rearward from the left and right side portions of the base portion 10 a. Have. Even when the base portion 10a is fully advanced, the rear portion always overlaps with the fixed outer shell 9 from above, and when it is fully retracted, almost the entire base portion 10a overlaps with the fixed outer shell 9. The arm portion 10b always overlaps the fixed outer shell 9 from above.
　スライドアウターシェル１０の基部１０ａは基本的には板状であり（格子状でもよい）、上面に補強用のリブが縦横に延びるように形成されている。そして、図１９や図２２（Ａ）等に示すように、固定アウターシェル９の前端寄り部位に、頭を有する正面視Ｔ型の第１ガイド突起１１７を複数個突設する一方、スライドアウターシェル１０の基部１０ａには、第１ガイド突起１１７が抜け不能で前後動自在に嵌まる前後長手のガイド長穴１１８を形成している。第１ガイド突起１１７とガイド長穴１１８とで第１ガイド手段が構成されている。第１ガイド突起１１７とガイド長穴１１８とは左右方向に飛び飛びに４個ずつ形成しているが、個数や位置は任意に設定できる。 The base 10a of the slide outer shell 10 is basically plate-shaped (may be lattice-shaped), and reinforcing ribs are formed on the upper surface so as to extend vertically and horizontally. Then, as shown in FIG. 19 and FIG. 22 (A) and the like, a plurality of first guide protrusions 117 having a head-view T-shape projecting from the front end portion of the fixed outer shell 9 are provided in a protruding manner. In the base portion 10a of the tenth, a longitudinal guide elongated hole 118 is formed in which the first guide protrusion 117 cannot be removed and fits forward and backward. The first guide protrusion 117 and the guide slot 118 constitute first guide means. Four first guide projections 117 and four guide long holes 118 are formed in a jumping manner in the left-right direction, but the number and position can be arbitrarily set.
　図１９から理解できるように、各ガイド長穴１１８の後端部は第１ガイド突起１１７の頭が嵌脱する広幅部１１８ａになっている。このため、広幅部１１８ａの箇所からガイド長穴１１８を第１ガイド突起１１７に嵌め込み、次いでスライドアウターシェル１０を後ろにスライドさせることにより、スライドアウターシェル１０の基部１０ａに抜け不能に保持される。 As can be understood from FIG. 19, the rear end portion of each guide slot 118 is a wide portion 118 a into which the head of the first guide protrusion 117 is fitted and detached. For this reason, the guide long hole 118 is fitted into the first guide protrusion 117 from the position of the wide width portion 118a, and then the slide outer shell 10 is slid rearward, so that the base portion 10a of the slide outer shell 10 is held so as not to be detached.
　図２２（Ｂ）（図６も参照）に示すように、スライドアウターシェル１０のアーム部１０ｂには、正断面視で下向きと上向きとに開口したクランク形で前後長手のガイド溝１１９が形成されている一方、固定アウターシェル９には、ガイド溝１１９に抜け不能に嵌まる略逆Ｌ形の第２ガイド突起１２０を一体に設けている。第２ガイド突起１２０とガイド溝１１９とは第２ガイド手段の一例を構成している。ガイド溝１１９は、下向き開口位置と上向き開口位置とを左右にずらすことにより、左右外向きに突出した支持部１１９ａを形成しており、他方、第２ガイド突起１２０は支持部１１９ａの上に位置する内向き鉤部１２０ａ形成している。図２５に示すように、ガイド溝１１９の後端部は、第２ガイド突起１２０の嵌め込みを許容するための広幅部１１９ｂになっている。 As shown in FIG. 22 (B) (see also FIG. 6), the arm portion 10b of the slide outer shell 10 is formed with a crank-shaped guide groove 119 having a crank shape that opens downward and upward in a front sectional view. On the other hand, the fixed outer shell 9 is integrally provided with a substantially inverted L-shaped second guide projection 120 that fits in the guide groove 119 so as not to be removed. The second guide protrusion 120 and the guide groove 119 constitute an example of second guide means. The guide groove 119 forms a support portion 119a that protrudes left and right by shifting the downward opening position and the upward opening position to the left and right, while the second guide protrusion 120 is positioned on the support portion 119a. The inward flange portion 120a is formed. As shown in FIG. 25, the rear end portion of the guide groove 119 is a wide portion 119b for allowing the second guide projection 120 to be fitted.
　図２２に示すように、アーム部１０ｂの下端には細幅の凸レール部１２１が形成されている一方、固定アウターシェル９には、凸レール部１２１がスライド自在に嵌まる凹レール部１２２が形成されており、これらレール部１２１，１２２が嵌まり合っていることにより、スライドアウターシェル１０の左右位置が規制されている。凸レール部１２１は固定アウターシェル９の前端近くまで延びており、凹レール部１２２がスライドアウターシェル１０の前端近くまで延びている。 As shown in FIG. 22, a narrow convex rail portion 121 is formed at the lower end of the arm portion 10b, while the fixed outer shell 9 has a concave rail portion 122 into which the convex rail portion 121 is slidably fitted. The left and right positions of the slide outer shell 10 are regulated by the rail portions 121 and 122 being fitted to each other. The convex rail portion 121 extends near the front end of the fixed outer shell 9, and the concave rail portion 122 extends near the front end of the slide outer shell 10.
　(11)．座インナーシェルと座アウターシェルとの関係
　座インナーシェル７は、座アウターシェル６の固定アウターシェル９とスライドアウーシェル１０との両方に連結されている。この点を次に説明する。 (11). Relationship between Seat Inner Shell and Seat Outer Shell The seat inner shell 7 is connected to both the fixed outer shell 9 and the slide outer shell 10 of the seat outer shell 6. This point will be described next.
　図１９や図２３（Ｂ）に示すように、固定アウターシェル９のうち左右両側縁寄りの部位でかつ略後半部には、前後に長いレール状のサイド支持部（サイド突条）１２３を形成しており、このサイド支持部１２３に座インナーシェル７の支持リブ１２４が載っている。また、図２３（Ｂ）に示すように、座インナーシェル７におけるメイン支持部７ａのうち支持リブ１２４の外側には水平状の段部１２５が形成されており、段部１２５の下側にスライドアウターシェル１０のアーム部１０ｂが配置されていると共に、段部１２５の内側壁の部位に内向きのストッパー片１２６を形成している。ストッパー片１２６は上下に開口した抜き穴１２７で三方から囲われている。 As shown in FIG. 19 and FIG. 23 (B), rail-shaped side support portions (side protrusions) 123 that are long in the front and rear directions are formed in a portion near the left and right side edges of the fixed outer shell 9 and substantially in the latter half. The support rib 124 of the seat inner shell 7 is placed on the side support portion 123. As shown in FIG. 23B, a horizontal step portion 125 is formed outside the support rib 124 in the main support portion 7 a of the seat inner shell 7, and slides below the step portion 125. The arm portion 10 b of the outer shell 10 is disposed, and an inward stopper piece 126 is formed on the inner wall portion of the step portion 125. The stopper piece 126 is surrounded from three sides by a punched hole 127 opened up and down.
　そして、固定アウターシェル９のサイド支持部１２３に、ストッパー片１２６に上から被さる抑止片１２８を一体に設けている。すなわち、座インナーシェル７におけるメイン支持部７ａの左右両端部は内向き移動不能に保持されており、このため、メイン支持部７ａは着座した人の荷重によって下向きに沈むように変形する。また、メイン支持部７ａの左右両側部はサイド支持部１２３で下降不能に保持されているため、人が着座してもスライドアウターシェル１０のアーム部１０ｂが座インナーシェル７のメイン支持部７ａで下向きに押されることはない。従って、着座した状態で、スライドアウターシェル１０のアーム部１０ｂが容易に前後スライドし得る。 Further, a deterrence piece 128 that covers the stopper piece 126 from above is integrally provided on the side support portion 123 of the fixed outer shell 9. That is, the left and right end portions of the main support portion 7a in the seat inner shell 7 are held so as not to move inwardly. Therefore, the main support portion 7a is deformed so as to sink downward due to the load of the seated person. Further, since the left and right side portions of the main support portion 7a are held so as not to be lowered by the side support portions 123, the arm portion 10b of the slide outer shell 10 is the main support portion 7a of the seat inner shell 7 even if a person is seated. It will not be pushed downward. Accordingly, the arm portion 10b of the slide outer shell 10 can easily slide back and forth in the seated state.
　抜き穴１２７はストッパー片１２６の後方にはみ出ており、このため、座インナーシェル７を所定位置よりもやや手前に位置させてから固定アウターシェル９に重ねることにより、抑止片１２８を抜き穴１２７の後部に嵌め込むことができる。その状態で座インナーシェル７を後ろにずらすと、抑止片１２８がストッパー片１２６の上に位置する。 The punching hole 127 protrudes behind the stopper piece 126. Therefore, the restraining piece 128 is overlapped with the fixing hole 127 by placing the seat inner shell 7 slightly in front of the predetermined position and then overlapping the fixed outer shell 9. Can be fitted into the rear. In this state, when the seat inner shell 7 is shifted backward, the restraining piece 128 is positioned on the stopper piece 126.
　図２２（Ｃ）に示すように、座インナーシェル７におけるメイン支持部７ａの左右両側端部には、スライドアウターシェル１０のアーム部１０ｂに向いて内向き突出した支持片１２９を前後方向に隔てて複数個形成している。支持片１２９は、表皮材を取り付けるためのものである。 As shown in FIG. 22 (C), support pieces 129 projecting inwardly toward the arm portion 10b of the slide outer shell 10 are separated in the front-rear direction at the left and right end portions of the main support portion 7a in the seat inner shell 7. Are formed. The support piece 129 is for attaching a skin material.
　図２３（Ａ）に示すように、固定アウターシェル９の左右後部には上部を二股に形成した鉤形のリア係合爪１３０を設けている一方、座インナーシェル７のリア支持部７ｂには、リア係合爪１３０に上から嵌まり係合するリア係合穴１３１を形成している。このリア係合穴１３１も、いったん座インナーシェル７を固定アウターシェル９に重ねてから後ろにずらすことで、リア係合爪１３０に係合する。 As shown in FIG. 23A, the left and right rear portions of the fixed outer shell 9 are provided with hook-shaped rear engagement claws 130 formed with a bifurcated upper portion, while the rear support portion 7b of the seat inner shell 7 has A rear engagement hole 131 is formed to be engaged with and engaged with the rear engagement claw 130 from above. This rear engagement hole 131 is also engaged with the rear engagement claw 130 by shifting the seat inner shell 7 once to the fixed outer shell 9 and then shifting it backward.
　図２１（Ｄ）に示すように、座インナーシェル７におけるリア支持部７ｂの左右中間部には、前端を自由端として下向きに突出させたセンター係止片１３２を設けている一方、固定アウターシェル９には、センター係止片１３２が前向き動不能に嵌まるセンター受け部１３３を凹み形成している。センター係止片１３２はその付け根を除いた３方がスリットで囲われており、このためセンター係止片１３２は付け根を支点にして上下に回動し得る。 As shown in FIG. 21D, a center locking piece 132 is provided at the left and right intermediate portions of the rear support portion 7b of the seat inner shell 7 so as to protrude downward with the front end as a free end. 9, a center receiving portion 133 into which the center locking piece 132 is fitted so as not to move forward is recessed. The center locking piece 132 is surrounded by a slit on three sides except for the root, and therefore the center locking piece 132 can be rotated up and down with the root as a fulcrum.
　図２０に示すように、固定アウターシェル９のうちセンター受け部１３３の左右外側の部位には、平面視四角形のサイド係合部１３４を形成し、このサイド係合部１３４に、座インナーシェル７のリア支持部７ｂに設けたサイド係合穴１３５が嵌まっている。これにより、座ンナーシェル７の後ろ向き移動が規制されている。 As shown in FIG. 20, a side engaging portion 134 having a square shape in plan view is formed on the left and right outer portions of the center receiving portion 133 in the fixed outer shell 9, and the seat inner shell 7 is formed on the side engaging portion 134. Side engagement holes 135 provided in the rear support portion 7b are fitted. As a result, the backward movement of the seat shell 7 is restricted.
　座インナーシェル７の前端部の連結構造は図２１（Ｂ）に示している。すなわち、座インナーシェル７における変形許容部７ｃのうち中心線を挟んだ左右両側の２カ所に、左右の下向きブラケット片１３６を介して支軸１３７を一体に形成する一方、スライドアウターシェル１０の前端には、支軸１３７が上から嵌まる軸受け部１３８を一体に設けている。支軸１３７と軸受け部１３８とは相対回転し得る。 The connecting structure of the front end portion of the seat inner shell 7 is shown in FIG. That is, the support shafts 137 are integrally formed via the left and right downward bracket pieces 136 at the two left and right sides of the seat inner shell 7 with respect to the center line, while the front end of the slide outer shell 10 is formed. Are integrally provided with a bearing portion 138 into which the support shaft 137 is fitted from above. The support shaft 137 and the bearing portion 138 can rotate relative to each other.
　従って、スライドアウターシェル１０を後退させると変形許容部７ｃの前端は後ろに引かれ、このため、変形許容部７ｃは折り返されたような状態で下に巻き込まれる。これにより、座３の前端位置を変更して前後長さ（前端の奥行き）を調節できる。支軸１３７及び軸受け部１３８の対の配置位置は左右２カ所には限らず、中間部と左右両側との３カ所に設けるなど、個数と配置位置は任意に設定できる。また、支軸１３８をスライドアウターシェル１０に設けて軸受け部１３８を座インナーシェル６の変形許容部に設けることも可能であり、更に、他の連結手段を採用してもよい。 Therefore, when the slide outer shell 10 is retracted, the front end of the deformation allowing portion 7c is pulled backward, and therefore the deformation allowing portion 7c is wound down in a state of being folded back. Thereby, the front-end position (depth of a front end) can be adjusted by changing the front-end position of the seat 3. The number of arrangement positions of the support shaft 137 and the bearing portion 138 is not limited to two positions on the left and right sides, and the number and arrangement positions can be arbitrarily set. Further, the support shaft 138 can be provided on the slide outer shell 10 and the bearing portion 138 can be provided on the deformation allowing portion of the seat inner shell 6, and other connecting means may be employed.
　(12). 座の奥行き操作機構
　次に、座３の前後座長さ調節の操作装置を主として図２４，２５に基づいて説明する。例えば図２５（Ｂ）に示すように、操作装置は、スライドアウターシェル１０の右側部に前後動自在に装着した指当てレバー１４０と、指当てレバー１４０の前後動によって左右スライドするロック部材１４１と、ロック部材１４１をロック姿勢に付勢するばね（圧縮コイルばね）１４２とを有する。 (12). Seat Depth Operation Mechanism Next, the operation device for adjusting the front and rear seat length of the seat 3 will be described mainly with reference to FIGS. For example, as shown in FIG. 25 (B), the operating device includes a finger contact lever 140 that is mounted on the right side of the slide outer shell 10 so as to freely move back and forth, and a lock member 141 that slides left and right as the finger contact lever 140 moves back and forth. And a spring (compression coil spring) 142 that urges the lock member 141 to the locked posture.
　図２５（Ａ）（Ｃ）に明瞭に示すように、スライドアウターシェル１０の左右側部の下面は内側に向けて低くなるように傾斜しており、この傾斜した下面に底面がフラットな凹所１４３を形成し、この凹所１４３に指当てレバー１４０が前後動自在に配置されている。指当てレバー１４０は凹所１４３の底面に重なる上板１４０ａとこの上板１４０ａから下向きに突出した摘まみ部１４０ｂとを有しており、上板１４０ａに、スライドアウターシェル１０の上に露出する正面視Ｔ形の係合突起１４４を一体に形成している。スライドアウターシェル１０には、係合突起１４４が抜け不能に嵌まる前後長手の取り付け穴１４５を形成している。取り付け穴１４５の前端には、係合突起１４４が嵌脱自在な幅広部１４５ａを形成している。 As clearly shown in FIGS. 25 (A) and 25 (C), the bottom surfaces of the left and right side portions of the slide outer shell 10 are inclined so as to be lowered toward the inside, and the bottom surface has a flat recess on the inclined bottom surface. 143 is formed, and the finger rest lever 140 is disposed in the recess 143 so as to be movable back and forth. The finger rest lever 140 has an upper plate 140a that overlaps the bottom surface of the recess 143 and a knob 140b that protrudes downward from the upper plate 140a, and is exposed on the slide outer shell 10 on the upper plate 140a. A front-view T-shaped engagement protrusion 144 is integrally formed. The slide outer shell 10 is provided with a longitudinal attachment hole 145 into which the engagement protrusion 144 cannot be removed. At the front end of the mounting hole 145, a wide portion 145a into which the engaging projection 144 can be freely fitted and removed is formed.
　ロック部材１４１は左右長手のロッド状の形態であり、スライドアウターシェル１０の下面に設けた左右長手のガイド溝１４６にスライド自在に嵌まっている。ガイド溝１４６と凹所１４３とは一体に連続している。また、ガイド溝１４６は凸レール部１２１を分断した状態で形成されている。 The lock member 141 has a left and right longitudinal rod shape, and is slidably fitted in a left and right longitudinal guide groove 146 provided on the lower surface of the slide outer shell 10. The guide groove 146 and the recess 143 are integrally continuous. The guide groove 146 is formed in a state where the convex rail portion 121 is divided.
　図２５（Ｂ）に示すように、ロック部材１４１のうち指当てレバー１４０に向いた外側端部は底面視Ｕ型の当接部１４１ａになっている一方、指当てレバー１４０には、ロック部材１４１の当接部１４１ａを下方から覆う凹所１４７が形成されており、凹所１４７の内側面を、間隔が広がるように傾斜した前後２つの傾斜面１４７ａと成している。 As shown in FIG. 25 (B), the outer end of the lock member 141 facing the finger contact lever 140 is a U-shaped contact portion 141a as viewed from the bottom, while the finger contact lever 140 includes a lock member. A recess 147 is formed to cover the abutting portion 141a of 141 from below, and the inner side surface of the recess 147 is formed with two front and rear inclined surfaces 147a that are inclined so that the interval is widened.
　ロック部材１４１の上面にはばね１４２が嵌まる溝１６８が形成されており、ばね１４２の一端はガイド溝１４６の内側面１４６ａに当接している。従って、ロック部材１４１は外向きに（指当てレバー１４０に向いた方向に）付勢されている。そして、指当てレバー１４０の凹所１４７はＶ形になっているので、指当てレバー１４０に外力が作用していない場合は、ロック部材１４１は外側に後退して当接部１４１ａが凹所１４７の深い位置に嵌まり、安定した状態に保持されている。他方、指当てレバー１４０を前後いずれかにスライドさせると、傾斜面１４７ａのガイド作用によってロック部材１４１が内側に前進動する。 A groove 168 into which the spring 142 is fitted is formed on the upper surface of the lock member 141, and one end of the spring 142 is in contact with the inner side surface 146 a of the guide groove 146. Therefore, the lock member 141 is urged outward (in a direction toward the finger contact lever 140). Since the recess 147 of the finger rest lever 140 is V-shaped, when no external force is applied to the finger rest lever 140, the lock member 141 is retracted outward and the contact portion 141a is the recess 147. It is fitted in a deep position and is held in a stable state. On the other hand, when the finger contact lever 140 is slid forward or backward, the lock member 141 moves forward inward by the guide action of the inclined surface 147a.
　ロック部材１４１の内端部には固定アウターシェル９に向いて下向き突出したストッパー突起１４９を一体に設けている。他方、固定アウターシェル９には、ロック部材１４１が左右動するとストッパー突起１４９が嵌脱するストッパー受け部１５０を設けている。ストッパー受け部１５０は前後長手の縦リブ１５１に内向きリブを飛び飛びに設けることで構成されており、本実施形態では５つのストッパー受け部１５０を前後に並べて形成されている。従って、座３の前後長さは５段階に調節できる。 A stopper protrusion 149 that protrudes downward toward the fixed outer shell 9 is integrally provided at the inner end of the lock member 141. On the other hand, the fixed outer shell 9 is provided with a stopper receiving portion 150 into which the stopper protrusion 149 is fitted and removed when the lock member 141 moves left and right. The stopper receiving part 150 is configured by jumping inward ribs on longitudinal longitudinal ribs 151 in the longitudinal direction, and in this embodiment, five stopper receiving parts 150 are formed side by side. Therefore, the longitudinal length of the seat 3 can be adjusted in five stages.
　例えば図６に示すように、スライドアウターシェル１０のうちスライド式の指当てレバー１４０と左右対称の位置には、スライド式の指当てレバー１４０と同じ形状の指当て突起１５２を一体に形成している。このため、座３の前後調節を、こじれのない状態でスムースに行える。スライド式の指当てレバー１４０をスライドアウターシェル１０の左右両側部に設けることも可能である。スライド式の指当てレバー１４０を左右に設けた場合、ロック部材１４１を左右に設けることも可能であるし、ロック部材１４１は片側だけに設けて片方のスライド式の指当てレバー１４０はダミーとすることも可能である。 For example, as shown in FIG. 6, finger sliding protrusions 152 having the same shape as the sliding finger rest lever 140 are integrally formed at positions symmetrical to the sliding finger rest lever 140 in the slide outer shell 10. Yes. For this reason, the front-rear adjustment of the seat 3 can be performed smoothly without being twisted. It is also possible to provide the sliding finger rest lever 140 on both the left and right sides of the slide outer shell 10. When the slide-type finger rest lever 140 is provided on the left and right, the lock member 141 can be provided on the left and right. The lock member 141 is provided only on one side, and one slide-type finger rest lever 140 is a dummy. It is also possible.
　本実施形態では、座インナーシェル７におけるメイン支持部７ａの左右両側部がサイド支持部１２３に載った状態に保持されていることにより、スライドアウターシェル１０のアーム部１０ａに着座者の体圧が全く又は殆ど作用しないため、座３の前後調節を着座したままで軽快に行うことができる。なお、着座者の大腿部が座インナーシェル７の変形許容部７ｃに上から当たっていることは有り得るが、変形許容部７ｃは伸びたり巻き込まれたり変形するに過ぎず、前後移動するものではないため、着座者の大腿部が座インナーシェル７に当たっていることは、座３の前後調節の抵抗にはならない。 In the present embodiment, the left and right sides of the main support portion 7a of the seat inner shell 7 are held on the side support portions 123, so that the body pressure of the seated person is applied to the arm portion 10a of the slide outer shell 10. Since it does not act at all or hardly, it can be easily performed while the seat 3 is being seated. Although it is possible that the thigh of the seated person hits against the deformation allowable portion 7c of the seat inner shell 7, the deformation allowable portion 7c is merely stretched, entangled or deformed and does not move back and forth. Therefore, the fact that the thigh of the seated person is in contact with the seat inner shell 7 does not serve as resistance for the longitudinal adjustment of the seat 3.
　また、本実施形態では、指当てレバー１４０を前後いずれの方向に移動させてもロック部材１４１はストッパー受け部１５０から離脱し、ロックが解除されてそのままスライドアウターシェル１０を前後動させることができる。従って、人は、座３の奥行き調節に当たっては、スライドアウターシェル１０を動かしたい方法に指当てレバー５８を動かすことでロックか解除されるため、ロック解除とスライドアウターシェル１０の移動とをワンアクションで行うことができる。従って、操作性がよい。 Further, in the present embodiment, the lock member 141 is detached from the stopper receiving portion 150 and the slide outer shell 10 can be moved back and forth as it is when the finger resting lever 140 is moved in any direction. . Accordingly, when the person adjusts the depth of the seat 3, the lock is released by moving the finger rest lever 58 in a way that the slide outer shell 10 is desired to be moved. Can be done. Therefore, operability is good.
　本実施形態ではスライドアウターシェル１０は固定アウターシェル９に上から重なっているため、例えば座３の前部に体圧が強く掛かった場合でも、スライドアウターシェル１０は固定アウターシェル９に密着するように作用する。つまり、体圧が強くかかるほど、スライドアウターシェル１０を座アウターシェル９に一体化する傾向を呈する。このため、スライドアウターシェル１０が人の体圧によって固定アウターシェル９から離れることはない。従って、支持強度・支持安定性に優れている。 In this embodiment, since the slide outer shell 10 overlaps the fixed outer shell 9 from above, for example, even when body pressure is strongly applied to the front portion of the seat 3, the slide outer shell 10 is in close contact with the fixed outer shell 9. Act on. That is, as the body pressure is increased, the slide outer shell 10 tends to be integrated with the seat outer shell 9. For this reason, the slide outer shell 10 is not separated from the fixed outer shell 9 by human body pressure. Therefore, it is excellent in support strength and support stability.
　本実施形態では、スライドアウターシェル１０のアーム部１０ｂはサイド支持部１２３の外側に配置されているため、座インナーシェル７でアーム部１０ｂが押されることを的確に防止できる。すなわち、座インナーシェル７のメイン支持部７ａはサイド支持部１２３に載っているため、座インナーシェル７のうちサイド支持部１２３の外側に位置した部分は着座者の体圧で上に浮く傾向を呈するのであり、このため、座インナーシェル７でスライドアウターシェル１０が押さえられることを防止して、スライドアウターシェル１０を軽快に前後動させることができる。 In this embodiment, since the arm portion 10b of the slide outer shell 10 is disposed outside the side support portion 123, it is possible to accurately prevent the arm portion 10b from being pushed by the seat inner shell 7. That is, since the main support portion 7a of the seat inner shell 7 is placed on the side support portion 123, the portion of the seat inner shell 7 located outside the side support portion 123 tends to float upward due to the body pressure of the seated person. Therefore, the slide outer shell 10 can be prevented from being pressed by the seat inner shell 7 and the slide outer shell 10 can be moved back and forth easily.
　本実施形態のように、アーム部１０ａの下端に設けた凸レール部１２１と固定アウターシェル９に設けた凹レール部１２２とを嵌合させると、スライドアウターシェル１０のガタ付きを無くすことができて好適である。 When the convex rail part 121 provided at the lower end of the arm part 10a and the concave rail part 122 provided in the fixed outer shell 9 are fitted as in the present embodiment, it is possible to eliminate the play of the slide outer shell 10. It is preferable.
　(13)．背もたれの背景技術・本例の特徴
　本願に開示した椅子は、背もたれの初期姿勢（基準姿勢、初期角度）を変更する機構についても改良を加えている。この点を次に説明する。 (13). Background Art of Backrest / Characteristics of this Example The chair disclosed in the present application also improves the mechanism for changing the initial posture (reference posture, initial angle) of the backrest. This point will be described next.
　椅子において、非後傾状態での背もたれの初期姿勢を変更可能とすることが提案されている（例えば特公昭４７－４９５４３号公報、特開２００２－１４２８９７号公報、特表２０１０－５１６４３３号公報、特公昭４６－８４４７号公報、特許第４１８５７５４号公報、特許第４２２０１９１号公報）。 In a chair, it has been proposed to be able to change the initial posture of the backrest in a non-reclined state (for example, Japanese Patent Publication No. 47-49543, Japanese Patent Application Laid-Open No. 2002-142897, Japanese Patent Application Publication No. 2010-516433, (Japanese Patent Publication No. 46-8447, Japanese Patent No. 4185754, Japanese Patent No. 4220191).
　さて、椅子においては着座者の腰部（特に第３腰椎のあたり）を支えることの重要性が指摘されており、そこで、側断面視で前向き突のランバーサポート部を設けることが広く普及している。つまり、人が椅子に腰掛けて執務等するにおいて、ランバーサポート部で人の腰を支えることにより、人は背筋を伸ばした適正な姿勢を採ることができるのであり、これにより、身体への負担を軽減することができる。 Now, it has been pointed out that it is important to support the lumbar part (especially around the third lumbar vertebrae) of a seated person in a chair, and therefore, it is widely used to provide a lumbar support part that protrudes forward in a side sectional view. . In other words, when a person sits on a chair and works, the lumbar support part supports the person's waist, so that the person can take a proper posture with his back straightened, thereby reducing the burden on the body. Can be reduced.
　他方、背もたれの初期姿勢を変えるのは使用者の好みに合わせるためであるが、初期姿勢を変えることで身体に対する当たりが変化するのは好ましくない。すなわち、背もたれの初期姿勢を変えることで身体の支持位置が前後にずれたり、身体への当たり位置が上下にずれたりするのは好ましくなく、ランバーサポート部を有する椅子では、ランバーサポート機能を的確に保持した状態で初期姿勢を変更可能にすることが好ましい。 On the other hand, the initial posture of the backrest is changed to suit the user's preference, but it is not preferable that the contact with the body changes by changing the initial posture. In other words, it is not preferable that the body support position shifts back and forth or the body contact position shifts up and down by changing the initial posture of the backrest.In a chair having a lumbar support part, the lumbar support function is accurately set. It is preferable that the initial posture can be changed while being held.
　しかし、特公昭４７－４９５４３号公報、特開２００２－１４２８９７号公報特表２０１０－５１６４３３号公報は、背もたれは背フレームの回動支点を中心にして傾動させて初期姿勢を変えるものであるため、背もたれは初期姿勢の調節に伴って全体的に前後移動することになり、このため、身体に突き上げ感が生じたり、逆に身体の支持機能が低下したりするおそれがある。 However, Japanese Patent Publication No. 47-49543 and Japanese Patent Application Laid-Open No. 2002-142897 Japanese Patent Publication No. 2010-516433 disclose that the backrest is tilted around the pivot point of the back frame to change the initial posture. The backrest moves back and forth as a whole with adjustment of the initial posture, which may cause the body to feel pushed up, and conversely, the support function of the body may decrease.
　また、特許第４１８５７５４号公報及び特許第４２２０１９１号公報は、ランバーサポート部を前後動させるものであるため、ランバーサポート機能は変化させることなく背もたれの初期姿勢を変えたいという要請には応え難い。 Moreover, since the patent 4185754 gazette and the patent 4220191 gazette move the lumbar support part back and forth, it is difficult to respond to the request to change the initial posture of the backrest without changing the lumbar support function.
　特公昭４６－８４４７号公報の背もたれはその上下中途部を中心にして回動するため、身体へのフィット性は高いと言えるが、背もたれはランバーサポート部を備えていないため、背もたれを後ろに寝た姿勢にすると、下端が前向きに突出して人に突き上げ感じを与えるおそれがある。また、ブラケットの上端部に設けたピンを操作して姿勢変更するものであるため、着座したままで姿勢変更操作することは困難であり、操作性が悪いという問題もある。 Since the backrest of Japanese Patent Publication No.46-8447 rotates around its upper and lower middle parts, it can be said that the fit to the body is high, but since the backrest is not equipped with a lumbar support part, the backrest lies back. If the posture is changed, the lower end may protrude forward and give a person a feeling of pushing up. Further, since the posture is changed by operating a pin provided on the upper end portion of the bracket, it is difficult to change the posture while sitting, and there is a problem that the operability is poor.
　本願に開示した調節機構はこのような現状を改善するものであり、身体の支持機能を適切に保持したまま背もたれの初期姿勢を変更可能にし、また、姿勢変更の操作性等にも配慮している。 The adjustment mechanism disclosed in the present application is to improve such a current situation, making it possible to change the initial posture of the backrest while appropriately maintaining the support function of the body, and considering the operability of the posture change. Yes.
　本願に開示した椅子は、座とその後ろに配置した背もたれとを有しており、前記背もたれは前記座の下方から後ろに延びる背フレームに取り付けられている構成において、前記背もたれは、着座した人の腰部を後ろから支える側断面視前向き突形のランバーサポート部を有しており、前記背もたれを、側面視で前記ランバーサポート部の高さ位置の箇所を中心に回動するように前記背フレームに連結している一方、前記背フレーム又は背もたれに、前記背もたれの側面視姿勢を変える初期角度調節装置を、人が着座したままで操作し得るように設けている。なお、「背フレーム又は背もたれ」は、いずれか一方に設ける場合と両方に設ける場合とを含んでいる。 The chair disclosed in the present application has a seat and a backrest disposed behind the seat, and the backrest is attached to a back frame extending backward from below the seat, and the backrest is a seated person. The lumbar support part has a lumbar support part that protrudes from the rear in a side sectional view and supports the lumbar part from behind, and the back frame is configured so that the backrest rotates around a position at a height position of the lumbar support part in a side view. On the other hand, an initial angle adjustment device that changes the side view posture of the backrest is provided on the back frame or the backrest so that it can be operated while a person is seated. The “back frame or backrest” includes a case where it is provided on either one and a case where it is provided on both.
　本願に開示した発明では、背もたれは、ランバーサポート部を中心にして回動することで初期姿勢（初期角度）が変わるため、初期姿勢を変えることでランバーサポート部の前後位置が大きく変化することはなく、このため、初期姿勢を変えることで身体への突き上げ感が生じたり支持機能が低下したりする不具合はない。すなわち、ランバーサポート機能を適切に確保しつつ、背もたれの初期姿勢を使用者の好みに応じて調節することができる。また、初期角度調節装置は人が着座したままで操作できるため、人は身体への感触を試しながら姿勢の調節をすることができて、ユーザーフレンドリーである。 In the invention disclosed in the present application, since the initial posture (initial angle) is changed by rotating the backrest around the lumbar support portion, the front and rear positions of the lumbar support portion are greatly changed by changing the initial posture. For this reason, there is no problem that a feeling of pushing up to the body or a support function is lowered by changing the initial posture. That is, the initial posture of the backrest can be adjusted according to the user's preference while appropriately securing the lumbar support function. In addition, since the initial angle adjustment device can be operated while a person is seated, the person can adjust the posture while trying to feel the body and is user-friendly.
　(14)．背もたれの具体構成
　次に、主として図２６以下の図面を参照して具体的な構成を説明する。例えば図１，３，図３０（Ａ）に示すように、背もたれ４は、着座した人の腰部が当たるランバーサポート部１５６を有しており、このため、側面視及び縦断側面視で前向き突形の形状になっている。正確に述べると、背インナーシェル１２は、縦断側面視でランバーサポート部１５６が最も前に位置するように湾曲している。また、背インナーシェル１２は平面視では前向き凹状に緩く湾曲しているが、湾曲の程度はランバーサポート部１５６で最も大きくて、上に行くに従って湾曲の程度は小さくなっており、上端では平坦に近い形態になっている。 (14). Specific Configuration of Backrest Next, a specific configuration will be described mainly with reference to the drawings of FIG. For example, as shown in FIGS. 1, 3 and 30A, the backrest 4 has a lumbar support portion 156 against which a seated person's waist hits. Therefore, the backrest 4 protrudes forward in a side view and a longitudinal side view. It is the shape of. To be precise, the back inner shell 12 is curved so that the lumbar support portion 156 is located in the foremost position when viewed in a longitudinal side view. In addition, the back inner shell 12 is gently bent in a concave shape in a plan view, but the degree of bending is the largest in the lumbar support portion 156, and the degree of bending decreases as it goes up, and is flat at the upper end. It is a close form.
　図１，３に示すように、背もたれ４は、ランバーサポート部１５６の箇所で最も左右横幅が大きくて、ランバーサポート部１５６から上と下に離れるに従って横幅が小さくなるように設定している。従って、背もたれ４（背インナーシェル１２）は正面視で略六角形近い形状になっている。ランバーサポート部１５６は背インナーシェル１２の下部に寄っているので、背もたれ４は、正確には下膨れの六角形状の形態になっており、ランバーサポート部１５６の左右端部は、正面視で左右横向き突出した山形の形態を成している。 As shown in FIGS. 1 and 3, the backrest 4 is set so that the lateral width is the largest at the lumbar support portion 156 and the lateral width decreases as it moves away from the lumbar support portion 156 upward and downward. Therefore, the backrest 4 (back inner shell 12) has a substantially hexagonal shape in front view. Since the lumbar support portion 156 is close to the lower portion of the back inner shell 12, the backrest 4 is precisely in the form of a swelled hexagonal shape, and the left and right ends of the lumbar support portion 156 are laterally sideways when viewed from the front. It has the shape of a protruding mountain.
　そして、背インナーシェル１２におけるランバーサポート部１５６の左右端部に、背支柱１５ｂの頭部１５ｃに連結するためのサイド連結部１５７を設けている。サイド連結部１５７はその周辺から前向きに突出している。 And the side connection part 157 for connecting with the head 15c of the back support | pillar 15b is provided in the right-and-left end part of the lumbar support part 156 in the back inner shell 12. FIG. The side connecting portion 157 protrudes forward from the periphery.
　例えば図２６に示すように、第２背フレーム１５における背支柱１５ｂの上端には、前向きに開口した拳状の頭部１５ｃが形成されており、この頭部１５ｃに、前向きに開口した軸受け部１５８を一体に形成している。他方、背インナーシェル１２のサイド連結部１５７には、軸受け部１５８に嵌まるボス部１５９を一体に形成しており、両者の嵌まり合いにより、背インナーシェル１２のサイド連結部１５７が背支柱１５ｂの頭部１５ｃに前向き抜け不能に連結されている。ボス部１５９は、その外側に設けたリブ１６０とその内側に設けた規制板１６１とに一体に繋がっている。 For example, as shown in FIG. 26, a fist-shaped head portion 15c that opens forward is formed at the upper end of the back column 15b in the second back frame 15, and a bearing portion that opens forward is formed on the head portion 15c. 158 is integrally formed. On the other hand, a boss portion 159 that fits into the bearing portion 158 is formed integrally with the side coupling portion 157 of the back inner shell 12, and the side coupling portion 157 of the back inner shell 12 is formed into a back column by the fitting of both. It is connected to the head 15c of 15b so that it cannot be removed forward. The boss portion 159 is integrally connected to a rib 160 provided on the outer side and a regulation plate 161 provided on the inner side.
　図３１（Ｂ）に明示するように、軸受け部１５８はくびれ部を有する一方、ボス部１５９は円を潰した断面形状になっているが、背もたれ４を所定の姿勢にセットした状態ではボス部１５９が略水平姿勢になるように設定する一方、軸受け部１５８の開口方向を水平に対して斜め上向きに開口するように設定している。このため、背もたれ４を所定の姿勢に対して後傾させた姿勢にすることでボス部１５９を軸受け部１５８に嵌め込みできると共に、背インナーシェル１２の下端を第２背フレーム１５に連結すると、背もたれ４に前向きの外力が作用してもボス部１５９は軸受け部１５８から抜け不能に保持される。従って、背もたれ４の取り付けを簡単に行える。 As clearly shown in FIG. 31B, the bearing portion 158 has a constricted portion, while the boss portion 159 has a cross-sectional shape in which a circle is crushed. However, when the backrest 4 is set in a predetermined posture, the boss portion While 159 is set to have a substantially horizontal posture, the opening direction of the bearing portion 158 is set to open obliquely upward with respect to the horizontal. For this reason, the boss portion 159 can be fitted into the bearing portion 158 by making the backrest 4 tilt backward with respect to a predetermined posture, and when the lower end of the back inner shell 12 is connected to the second back frame 15, the backrest 4, the boss 159 is held so as not to be detached from the bearing 158 even if a forward external force is applied to the bearing 4. Therefore, the backrest 4 can be easily attached.
　図２６及び図２９に示すように、背支柱１５ｂの頭部１５ｃのうち軸受け部１５８の内側の部位に、ボス部１５９の半径より遙かに大きな曲率の円弧面を有する荷重受け部１６２が形成されている一方、背インナーシェル１２のサイド連結部１５７には、荷重受け部１６２に嵌まる円弧状の荷重当て部１６３を一体に設けている。この荷重当て部１６３が荷重受け部１６２に広い面積で当たっている（面接触している）ことにより、背インナーシェル１２は、前後回動を阻害されることなく左右の背支柱１５ｂによって安定的に支持されている。 As shown in FIGS. 26 and 29, a load receiving portion 162 having an arc surface having a curvature much larger than the radius of the boss portion 159 is formed in a portion inside the bearing portion 158 of the head portion 15c of the back column 15b. On the other hand, the side connecting portion 157 of the back inner shell 12 is integrally provided with an arc-shaped load application portion 163 that fits in the load receiving portion 162. Since the load contact portion 163 contacts the load receiving portion 162 in a wide area (surface contact), the back inner shell 12 is stably supported by the left and right back struts 15b without being obstructed from front-rear rotation. It is supported by.
　また、背支柱１５ｂの頭部１５ｃのうち軸受け部１５８と荷重受け部１６２との間には溝１６４が空いており、この溝１６４に背インナーシェル１２の規制板１６１が左右ずれ不能にきっちり嵌まっている。このように、溝１６４と規制板１６１の嵌まり合いによって背インナーシェル１２は左右ずれ不能に保持されているため、ランバーサポート部１５６に後ろ向きの荷重が作用してサイド連結部１５７が内向きに引っ張られても、サイド連結部１５７が内側にずれ動くことはない。このため取り付け強度が高い。溝１６４の底面と規制板１６１の外周は側面視でボス部１５９の軸心回りの曲率の円弧状に形成されており、従って、背インナーシェル１２がボス部１５９の軸心回りに回動することが許容されている。 In addition, a groove 164 is formed between the bearing portion 158 and the load receiving portion 162 in the head portion 15c of the back column 15b, and the regulation plate 161 of the back inner shell 12 is securely fitted in the groove 164 so that it cannot be displaced from side to side. waiting. As described above, the back inner shell 12 is held so as not to be laterally displaced by the fitting of the groove 164 and the regulating plate 161. Therefore, a backward load acts on the lumbar support portion 156 so that the side connecting portion 157 faces inward. Even if pulled, the side connecting portion 157 does not move inward. For this reason, the mounting strength is high. The bottom surface of the groove 164 and the outer periphery of the regulating plate 161 are formed in an arc shape having a curvature around the axis of the boss portion 159 in a side view, and thus the back inner shell 12 rotates around the axis of the boss portion 159. Is allowed.
　上述のように、背支柱１５ｂの上端と背インナーシェル１２の組付構造において、前後方向の抜け止め、背にかかる荷重の支持、左右のずれ防止をそれぞれ別の特定部位で行っている。具体的には、前後方向の抜け止めはボス部１５９と軸受け部１５８で行っており、両者に他の機能（背にかかる荷重の支持、左右のずれ防止）を持たせないよう、ボス部１５９は、その外周面と軸受け部１５８の内周面との間に若干のクリアランスを持たせた状態で軸受け部１５８に遊嵌されていると共に、軸受け部１５８の左右幅寸法よりもボス部１５９の左右幅寸法を若干幅広に設定することで、リブ板１６０が軸受け部１５８の側面に当らないようにしている。また、規制板１６１の後端面は背支柱１５ｂにおける溝１６４の底面に当たらないように設定されている。 As described above, in the assembly structure of the upper end of the back column 15b and the back inner shell 12, the front-rear direction is prevented, the load applied to the back is supported, and the right and left displacement is prevented at different specific parts. Specifically, the boss portion 159 and the bearing portion 158 prevent the detachment in the front-rear direction, so that the boss portion 159 does not have other functions (support of load on the back, prevention of left-right displacement). Is loosely fitted to the bearing portion 158 with a slight clearance between its outer peripheral surface and the inner peripheral surface of the bearing portion 158, and the boss portion 159 is larger than the lateral width dimension of the bearing portion 158. By setting the left and right width dimensions to be slightly wider, the rib plate 160 is prevented from hitting the side surface of the bearing portion 158. Further, the rear end surface of the regulating plate 161 is set so as not to hit the bottom surface of the groove 164 in the back column 15b.
　(15). 初期角度調節装置
　背インナーシェル１２の下端部は、その左右中間部が初期角度調節装置１５５を介して第２背フレーム１５に連結されている。この点を次に説明する。 (15). Initial angle adjusting device The lower left end portion of the back inner shell 12 is connected to the second back frame 15 via the initial angle adjusting device 155 at the left and right intermediate portions. This point will be described next.
　例えば図２８（Ａ）（Ｃ）に示すように、背インナーシェル１２の下端部の左右中間部に前向きに突出したロア連結部１６６を設けており、このロア連結部１６６には下向きに開口したセンター溝１６７が形成されていると共に、センター溝１６７を横切る状態でピン穴１６８が空いている。更に、背インナーシェル１２の下端部のロア連結部１６６の右側の部位には、ロア連結部１６６に接続された上下のリブ１６９，１７０を設け、上下リブ１６９，１７０の間に操作具（スライド式レバー）１７１を左右スライド自在に装着している。ロア連結部１６６と操作具１７１とは初期角度調節装置１５５の構成要素である。操作具１７１には、人が掴むことのできる指掛け部１７１ａを設けている。 For example, as shown in FIGS. 28A and 28C, a lower connecting portion 166 that protrudes forward is provided at the left and right middle portion of the lower end portion of the back inner shell 12, and the lower connecting portion 166 opens downward. A center groove 167 is formed, and a pin hole 168 is vacant across the center groove 167. Furthermore, upper and lower ribs 169 and 170 connected to the lower connecting portion 166 are provided on the right side of the lower connecting portion 166 at the lower end portion of the back inner shell 12, and an operation tool (slide) is provided between the upper and lower ribs 169 and 170. Type lever) 171 is slidably mounted to the left and right. The lower connecting portion 166 and the operation tool 171 are components of the initial angle adjusting device 155. The operation tool 171 is provided with a finger hook portion 171a that can be grasped by a person.
　操作具１７１には、ロア連結部１６６のピン穴１６８に嵌まるピン状のロックピン１７２が一体に形成されている。従って、操作具１７１を左右スライドさせると、ロックピン１７２をロア連結部１６６のセンター溝１６６に出没させることができる。ロックピン１７２はストッパーの一例である。上リブ１６９には、操作具１７１を背インナーシェル１２から外れないように保持する爪１７３を設けている。 The operation tool 171 is integrally formed with a pin-shaped lock pin 172 that fits into the pin hole 168 of the lower connecting portion 166. Therefore, when the operation tool 171 is slid left and right, the lock pin 172 can be projected and retracted in the center groove 166 of the lower connecting portion 166. The lock pin 172 is an example of a stopper. The upper rib 169 is provided with a claw 173 that holds the operation tool 171 so as not to be detached from the back inner shell 12.
　また、操作具１７１には、背インナーシェル１２に向いて開口したばね配置用空所１７４と、ストローク規制用空所１７５とを設けている。ばね配置用空所１７４がロックピン１７２の側に位置し、ストローク規制用空所１７５が指掛け部１７１の側に位置している。他方、背インナーシェル１２には、ばね配置用空所１７４に入り込むばね受け突起１７６と、ストローク規制用空所１７５に入り込むストローク規制突起１７７とを設けており、ばね受け突起１７６とばね配置用空所１７４の内側面１７４ｅｅとの間に圧縮コイルばね１７８を配置している。このため、操作具１７１はロックピン１７２がロア連結部１６６に嵌まり勝手となるように（ロック位置が保持されるように）付勢されている。ばね１７８は、操作具１７１の前面に設けた窓穴１７９から押し込むことにより、ばね配置用空所１７４に配置される。 Further, the operation tool 171 is provided with a spring placement space 174 that opens toward the back inner shell 12 and a stroke restriction space 175. The spring disposing space 174 is located on the lock pin 172 side, and the stroke restricting space 175 is located on the finger hook portion 171 side. On the other hand, the back inner shell 12 is provided with a spring receiving protrusion 176 that enters the spring arrangement space 174 and a stroke restriction protrusion 177 that enters the stroke restriction space 175, and the spring receiving protrusion 176 and the spring arrangement space 175. A compression coil spring 178 is disposed between the inner surface 174ee of the place 174. For this reason, the operation tool 171 is urged so that the lock pin 172 fits into the lower connecting portion 166 and becomes free (so that the lock position is maintained). The spring 178 is arranged in the spring arrangement space 174 by being pushed in from a window hole 179 provided on the front surface of the operation tool 171.
　操作具１７１を手で外側に引いたときの後退位置の規制は、ストローク規制用空所１７５の内側面をストローク規制突起１８０に当てることで行われる。なお、操作具１７１がばねで押されたときの前進位置の規制は、ばね配置用空所１７４の内側面をストローク規制突起１８０に当てることで行ってもよいし、操作具１７１の端部をロア連結部１６６の側面に当てることで行ってもよい。 The restriction of the retracted position when the operation tool 171 is pulled outward by hand is performed by bringing the inner surface of the stroke restriction space 175 into contact with the stroke restriction protrusion 180. The forward position when the operating tool 171 is pushed by a spring may be regulated by applying the inner surface of the spring placement space 174 to the stroke regulating projection 180, or the end of the operating tool 171 may be You may carry out by contacting to the side surface of the lower connection part 166. FIG.
　図２８（Ｂ）に示すように、第２背フレーム１５における基部１５ａの後端には後ろ壁１５ｄが形成されており、１５ａ′が、座インナーシェル１２におけるロア連結部１６６のセンター溝１６７に下方から嵌まるブロック状のロック体１８１を設けており、このロック体１８１に、操作具１７１のロックピンが嵌まる３つのロック穴１８２を空けている。従って、ロック体１８１も初期角度調節装置１５５の構成要素である。３つのロック穴１８２は、背インナーシェル１２の回動支点を中心にした円弧上の存在しており、ロックピンがいずれかのロック穴１８２に選択的に嵌まることにより、背もたれ４の初期姿勢を３段階に変更できる。敢えて述べるまでもないが、ロック穴１８２の数は３個には限らず、２個又は４固以上であってもよい。ロック穴１８２はロック部の一例である。 As shown in FIG. 28B, a rear wall 15d is formed at the rear end of the base portion 15a in the second back frame 15, and 15a 'is formed in the center groove 167 of the lower connecting portion 166 in the seat inner shell 12. A block-shaped lock body 181 fitted from below is provided, and three lock holes 182 into which the lock pins of the operation tool 171 are fitted are formed in the lock body 181. Therefore, the lock body 181 is also a component of the initial angle adjusting device 155. The three lock holes 182 exist on an arc centered on the rotation fulcrum of the back inner shell 12, and the initial posture of the backrest 4 is obtained by selectively fitting the lock pins into any of the lock holes 182. Can be changed in three stages. Needless to say, the number of lock holes 182 is not limited to three, but may be two or four or more. The lock hole 182 is an example of a lock portion.
　ロック体１８１は樹脂製で第２背フレーム１５とは別体に構成されており、第２背フレーム１５の基部１５ａに下方から嵌め込み装着されている。このため、例えば図２７に示すように、第２背フレーム１５の基部１５ａには、ロック体１８１が下方から嵌まる穴１８３を空けていると共に、ロック体１８１を後ろから支えるセンターガード部１８４を設け、センターガード部１８４に、ロック体１８１が嵌まる前向き開口の溝１８５を設けている。ロック体１８１には、背インナーシェル１２の下端が前向きに大きく前進することを規制する前壁１８１ａを設けている。 The lock body 181 is made of resin and is configured separately from the second back frame 15, and is fitted into the base portion 15 a of the second back frame 15 from below. For this reason, for example, as shown in FIG. 27, the base portion 15a of the second back frame 15 has a hole 183 into which the lock body 181 is fitted from below, and a center guard portion 184 that supports the lock body 181 from behind. The center guard portion 184 is provided with a forward opening groove 185 into which the lock body 181 is fitted. The lock body 181 is provided with a front wall 181a that restricts the lower end of the back inner shell 12 from moving forward greatly.
　図３０に示すように、第２背フレーム１５の下面にはロック体１８１が入り込む凹所１８８を形成し、ロック体１８１に設けた下フランジ１８１ｂを凹所１８８の底面に重ねている。そして、凹所１８８の内側面に支持爪１８９を設け、下フランジ１８１ｂが支持爪１８９を下方から乗り越えることにより、ロック体１８１は落下不能に保持されている。ロック体１８１は第２背フレーム１５に一体に設けることも可能である。 30, a recess 188 into which the lock body 181 enters is formed on the lower surface of the second back frame 15, and a lower flange 181 b provided on the lock body 181 is overlaid on the bottom surface of the recess 188. And the support claw 189 is provided in the inner surface of the recess 188, and the lower flange 181b gets over the support claw 189 from below, so that the lock body 181 is held so as not to drop. The lock body 181 can also be provided integrally with the second back frame 15.
　なお、ユーザーによっては背もたれ４の初期姿勢調節機能を必要としない場合もあり得る。そこで、例えば図７に示すように、第２背フレーム１５の後端部に受けブラケット１５ｅを設けたこれに規制体１５ｆを装着して、背インナーシェル１２の下端に設けた規制軸（図示せず）を規制体１５ｆに嵌めることで、背インナーシェル１２は回動不能に保持される。詳細は省略する。 Note that some users may not need the function of adjusting the initial posture of the backrest 4. Therefore, for example, as shown in FIG. 7, a restricting shaft (not shown) is provided at the lower end of the back inner shell 12 by attaching a restricting body 15 f to a receiving bracket 15 e provided at the rear end of the second back frame 15. The inner back shell 12 is held so as not to rotate. Details are omitted.
　例えば図１（Ｃ）から明らかなように、背もたれ４の下端は座面よりも下方に位置しており、従って、初期角度調節装置１５５も座面の下方に配置されている。このため初期角度調節装置１５５が身体に触れることはない。また、着座した人は後ろに手を伸ばして操作具１７１を操作できるため、初期角度の調節もごく簡単に行える。 For example, as is clear from FIG. 1 (C), the lower end of the backrest 4 is located below the seating surface, and therefore the initial angle adjusting device 155 is also disposed below the seating surface. For this reason, the initial angle adjusting device 155 does not touch the body. Further, since the seated person can reach the back and operate the operation tool 171, the initial angle can be easily adjusted.
　(16). 他の初期角度調節装置
　次に、図３２～図３５に示す初期角度調節装置の別例を説明する。この例では、図３２のとおり左右一対の軸受けリブ１９０を設けて、操作具１７１を介して左右の軸受けリブ１９０で周面カム１９１を回転自在に保持している一方、背インナーシェル１２の下端部には、周面カム１９１を囲う箱状で下向き開口のロア連結部１９２を一体に設けている。そして、操作具１７１で周面カム１９１を回転させるとは、周面カム１９１による連結部１９２の前後支持位置が変化し、これによって背もたれ４の初期角度が変化する。従って、操作具１７１は回転式である。 (16). Other Initial Angle Adjusting Device Next, another example of the initial angle adjusting device shown in FIGS. 32 to 35 will be described. In this example, a pair of left and right bearing ribs 190 are provided as shown in FIG. 32, and the circumferential cam 191 is rotatably held by the left and right bearing ribs 190 via the operation tool 171, while the lower end of the back inner shell 12. The box is integrally provided with a lower connecting portion 192 having a box-like shape and opening downward, which surrounds the circumferential cam 191. When the circumferential cam 191 is rotated by the operation tool 171, the front / rear support position of the connecting portion 192 by the circumferential cam 191 is changed, whereby the initial angle of the backrest 4 is changed. Therefore, the operation tool 171 is a rotary type.
　図３２に示すように、この例では、周面カム１９１の左右両端に軸受け筒部１９３を一体に形成している一方、軸受けリブ１９０の内側面には、周面カム１９１に設けた左右筒部１９３が嵌まる上下長手の長溝１９４を形成している。操作具１７１の角形部１７１ａが周面カム１９１の筒部１９４に貫通しているが、図３４（Ｂ）に明瞭に示すように、操作具１７１の角形部１７１ａの付け根部に一対の突起１９５を設ける一方、周面カム１９１における一方の筒部１９３には突起１９５が嵌まる一対の切欠き部１９６を形成している。このため、周面カム１９１と操作具１７１との一体性が高まっている。 As shown in FIG. 32, in this example, bearing cylinder portions 193 are integrally formed at both left and right ends of the circumferential cam 191, while the left and right cylinders provided on the circumferential cam 191 are formed on the inner side surface of the bearing rib 190. A vertically long slot 194 into which the portion 193 is fitted is formed. The square portion 171a of the operation tool 171 penetrates the cylindrical portion 194 of the circumferential cam 191. As clearly shown in FIG. 34B, a pair of protrusions 195 are formed at the base of the square portion 171a of the operation tool 171. On the other hand, a pair of notches 196 into which the projections 195 are fitted are formed in one cylindrical portion 193 of the circumferential cam 191. For this reason, the integrity of the circumferential cam 191 and the operation tool 171 is enhanced.
　操作具１７１の先端には小径部１９７を形成しており、小径部１９７が、他方の軸受けリブ１９０に設けた軸受け穴１９８に回転自在に嵌まっている。そして、操作具１７１の小径部１９７の先端には軸心と直交した方向に突出した一対のストッパー片１９９を設けている一方、他方の軸受けリブ１９０の外面には、ストッパー片１９９が抜け不能に嵌まる段部２００を形成している。他方の軸受けリブ１９０の軸受け穴１９８は前後に長い長穴になっており、従って、ストッパー片１７９は横向きにすることで軸受け穴１９８に嵌まり、ストッパー片１９９を軸受け穴１９８に嵌め込んでから操作具１７１を９０°回転させると、操作具１７１は抜け不能に保持される。 A small diameter portion 197 is formed at the tip of the operation tool 171, and the small diameter portion 197 is rotatably fitted in a bearing hole 198 provided in the other bearing rib 190. A pair of stopper pieces 199 projecting in a direction perpendicular to the shaft center is provided at the tip of the small diameter portion 197 of the operation tool 171, while the stopper piece 199 cannot be removed from the outer surface of the other bearing rib 190. A stepped portion 200 is formed. The bearing hole 198 of the other bearing rib 190 is a long hole in the front and rear direction. Therefore, the stopper piece 179 is fitted sideways into the bearing hole 198 and the stopper piece 199 is fitted into the bearing hole 198. When the operation tool 171 is rotated by 90 °, the operation tool 171 is held so as not to be detached.
　操作具１７１の差し込みは、周面カム１９１を左右軸受けリブ１９０の間にセットしてから行われる。図３４（Ｂ）に示すように、突起７７の突出方向８３とストッパー片８１の突出方向８４とを直交させている。図１９に示すように、操作具１７１のうちグリップの基端には、背もたれ５がどのような姿勢であるかを表示するためのリブ１７１ｂを設けている。 The insertion of the operation tool 171 is performed after the circumferential cam 191 is set between the left and right bearing ribs 190. As shown in FIG. 34 (B), the protruding direction 83 of the protrusion 77 and the protruding direction 84 of the stopper piece 81 are orthogonal to each other. As shown in FIG. 19, a rib 171 b for displaying the posture of the backrest 5 is provided at the proximal end of the grip of the operation tool 171.
　図３４及び図３５に示すように、周面カム１９１の嵌め込みは、回転軸心を水平に対して傾斜した姿勢で左右軸受けリブ１９０の間に嵌め込んでから水平姿勢に戻すという手順でわれる。長溝１９４は上下に長いため、周面カム１９１を正面視で傾けることで左右の筒部７５を左右の長溝７６に嵌め込むことができ、回転軸心が水平になるように姿勢を戻すと周面カム１９１は前後動不能に保持される。 As shown in FIGS. 34 and 35, the circumferential cam 191 is fitted in a procedure in which the rotational axis is fitted between the left and right bearing ribs 190 in a posture inclined with respect to the horizontal, and then returned to the horizontal posture. Since the long groove 194 is long in the vertical direction, the left and right cylindrical portions 75 can be fitted into the left and right long grooves 76 by tilting the circumferential cam 191 in a front view, and when the posture is returned so that the rotation axis is horizontal, The face cam 191 is held so as not to move back and forth.
　例えば図３３（Ｂ）に明瞭に示すよう、背インナーシェル１２のロア連結部１９２には、操作具挿通用の長穴２０１が下向きに開口している。 For example, as clearly shown in FIG. 33 (B), a long hole 201 for inserting the operation tool is opened downward in the lower connecting portion 192 of the back inner shell 12.
　操作具１７１のうち左右軸受けリブ１９０の間に位置した先端部は角柱部１７１ｂになっており、この角柱部１７１ｂに周面カム１９１が相対回転不能に（すなわち、操作具１７１と一緒に回転するように）嵌まっている。周面カム１９１は、１つのセンターカム部２０４とその左右両側に位置した左右一対のサイドカム部２０５を有している。 The front end portion of the operation tool 171 located between the left and right bearing ribs 190 is a prism portion 171b, and the circumferential cam 191 cannot be rotated relative to the prism portion 171b (that is, rotates together with the operation tool 171). Like). The circumferential cam 191 has one center cam portion 204 and a pair of left and right side cam portions 205 located on both the left and right sides thereof.
　センターカム部２０４とサイドカム部２０５とはその外周面をカム面としており、ロア連結部１９２の前内面をセンターカム部２０４が当接する前規制面１９２ａと成し、ロア連結部１９２の後ろ内面をサイドカム部２０５が当接する後ろ規制面１９２ｂと成している。センターカム部２０４の外周には、軸心からの高さが異なる第１～第３のカム面２０４ａ～６３ｃが形成され、サイドカム部２０５の外周にも軸心からの高さが異なる第１～第３のカム面２０５ａ～２０５ｃが形成されている。ロア連結部１９２は既述のように下向きに開口しているが、前規制面１９２ａと後ろ規制面１９２ｂとの前後間隔は下に行くに従って大きくなるように設定している。 The center cam portion 204 and the side cam portion 205 have outer peripheral surfaces as cam surfaces, the front inner surface of the lower connecting portion 192 is formed as a front restricting surface 192a with which the center cam portion 204 abuts, and the rear inner surface of the lower connecting portion 192 is formed. It forms a rear regulating surface 192b with which the side cam portion 205 abuts. First to third cam surfaces 204a to 63c having different heights from the shaft center are formed on the outer periphery of the center cam portion 204, and the first to third cam surfaces 204a to 63c having different heights from the shaft center are also formed on the outer periphery of the side cam portion 205. Third cam surfaces 205a to 205c are formed. The lower connecting portion 192 opens downward as described above, but the front-rear distance between the front restriction surface 192a and the rear restriction surface 192b is set to increase as it goes downward.
　両カム部２０４、２０５は、センターカム部２０４の第１カム面２０４ａが前規制面１９２ａに当接しているときは、サイドカム部２０５の第１カム面２０５ａが後ろ規制面１９２ｂに当接し、センターカム部２０４の第２カム面２０４ｂが前規制面１９２ａに当接しているときは、サイドカム部２０５の第２カム面２０５ｂが後ろ規制面１９２ｂに当接し、センターカム部２０４の第３カム面２０４ｃが前規制面１９２ａに当接しているときは、サイドカム部２０５の第３カム面２０５ｃが後ろ規制面１９２ｂに当接している。 When the first cam surface 204a of the center cam portion 204 is in contact with the front restricting surface 192a, the first cam surface 205a of the side cam portion 205 is in contact with the rear restricting surface 192b. When the second cam surface 204b of the cam portion 204 is in contact with the front restriction surface 192a, the second cam surface 205b of the side cam portion 205 is in contact with the rear restriction surface 192b, and the third cam surface 204c of the center cam portion 204 is contacted. Is in contact with the front regulating surface 192a, the third cam surface 205c of the side cam portion 205 is in contact with the rear regulating surface 192b.
　本例では、操作具１７１を回転操作することで背もたれ４の初期角度を３段階に調節でき、かつ、背もたれ４は前後にガタ付き不能に保持される。なお、周面カム１９１の回転に対して抵抗が生じるが、ロア連結部１９２を弾性変形させることで周面カム１９１を回転させることができる。ロア連結部１９２の左右側板には、当該ロア連結部１９２が回動することを許容するため、操作具１７１が遊嵌する長穴２０１を設けている。 In this example, the initial angle of the backrest 4 can be adjusted in three stages by rotating the operation tool 171 and the backrest 4 is held so that it cannot be rattled back and forth. In addition, although resistance arises with respect to rotation of the surrounding surface cam 191, the surrounding surface cam 191 can be rotated by elastically deforming the lower connection part 192. The left and right side plates of the lower connecting portion 192 are provided with a long hole 201 into which the operation tool 171 is loosely fitted in order to allow the lower connecting portion 192 to rotate.
　例えば図３５に示すように（図３２も参照）、軸受けリブ１９０の前面部には、下端を自由端とした弾性片２０２を切り開き状に一体に形成しており、この弾性片２０２に係合穴２０３を設けている一方、周面カム１９１におけるセンターカム部２０４の各カム面２０４ａ，２０４ｂ，２０４ｃには、係合穴２０３に嵌まる突起２０６をそれぞれ設けている。このため、いずれかの突起８８が係合穴８７に嵌まることで、使用者は周面カム１９１を所定の状態に回転させたことを間隔で把握できる。すなわち、操作具１７１は、クリック感を持って正確に回転させることができる。 For example, as shown in FIG. 35 (see also FIG. 32), an elastic piece 202 having a lower end as a free end is integrally formed on the front portion of the bearing rib 190 so as to be engaged with the elastic piece 202. While the holes 203 are provided, the cam surfaces 204a, 204b, and 204c of the center cam portion 204 of the circumferential cam 191 are provided with protrusions 206 that fit into the engagement holes 203, respectively. For this reason, when one of the protrusions 88 is fitted into the engagement hole 87, the user can grasp at intervals that the circumferential cam 191 has been rotated to a predetermined state. That is, the operation tool 171 can be accurately rotated with a click feeling.
　初期角度調節装置も様々に具体化できる。操作具はスライド式や回転式には限らず、回動式なども採用できる。プッシュボタン付きの操作具を背もたれの下端部に設けて、プッシュボタンを押してロックを解除した状態を保持しつつ操作具を前後移動させてもたれを回動させるという構成を採用することも可能である。初期角度調節装置にカムを使用する場合、端面カム等の各種のカムを採用できる。初期角度調節装置にねじ式のハンドルを設けて、背もたれの初期角度を無段階に調節することも可能である。ピンやカム以外のロック機構を採用することも可能である。 The initial angle adjustment device can be embodied in various ways. The operation tool is not limited to a slide type or a rotary type, and a rotary type or the like can be adopted. It is also possible to adopt a configuration in which an operation tool with a push button is provided at the lower end of the backrest and the lean is rotated even if the operation tool is moved back and forth while holding the unlocked state by pushing the push button. . When a cam is used for the initial angle adjusting device, various cams such as an end face cam can be employed. It is also possible to adjust the initial angle of the backrest steplessly by providing a screw type handle in the initial angle adjusting device. It is also possible to employ a lock mechanism other than a pin or cam.
　本願発明及び本願で開示した各発明は椅子に具体化できる。従って、産業上利用できる。 The invention of the present application and each invention disclosed in the present application can be embodied in a chair. Therefore, it can be used industrially.
　　１　脚支柱（ガスシリンダ）
　　２　ベース
　　３　座
　　４　背もたれ
　　５　中間金具
　１４，１５　背フレーム
　１６　第１軸（背もたれの傾動支点になる軸）
　１８　押動軸
　２３　弾力調節ユニット
　２５　第２軸
　２６　ロック用ガスシリンダ
　３２　第３軸
　３８　支持ブラケット
　５０　ばねユニット
　５１　操作軸
　５２　姿勢保持体
　５３　ばね保持体を構成する筒状部材（固定ばね受け）
　５４　ロッキング用ばね手段の一例としての圧縮コイルばね
　５５　ばね保持体を構成する可動ばね受け
　６０　支軸（連結部）
　６２　押動部の一例としてのプッシャー
　７０　カムの一例としての周面カム
　７１　カム受け部
　７２　カム面
　７３　カム部材
　７８　弾性部の一例としてのゴム 1 Leg support (gas cylinder)
2 Base 3 Seat 4 Backrest 5 Intermediate bracket 14, 15 Back frame 16 Axis 1 (Axis that serves as a tilting fulcrum for the backrest)
18 Pushing shaft 23 Elasticity adjusting unit 25 Second shaft 26 Gas cylinder for locking 32 Third shaft 38 Support bracket 50 Spring unit 51 Operation shaft 52 Posture holder 53 Cylindrical member (fixed spring receiver) constituting the spring holder
54 Compression coil spring as an example of locking spring means 55 Movable spring receiver constituting spring holder 60 Support shaft (connecting portion)
62 Pusher as an example of a pushing portion 70 Peripheral cam as an example of a cam 71 Cam receiving portion 72 Cam surface 73 Cam member 78 Rubber as an example of an elastic portion

Claims (6)

  1. 　座と、後傾動自在な背もたれと、前記背もたれの後傾動に抵抗を付与するロッキング用ばね手段と、前記背もたれの後傾動に対する前記ばね手段の抵抗の度合いを変える弾力調節部材とを備えており、
    　前記弾力調節部材は人が着座した状態で回転操作できるカムであり、前記背もたれの後傾動に伴うロッキング荷重が前記ばね手段に作用する位置を前記カムで変えることにより、前記ばね手段に掛かるモーメントを変えてばね手段の抵抗の度合いが調節される、
    ロッキング椅子。     A seat, a backrest that can be tilted backward, a locking spring means that provides resistance to the back tilt of the backrest, and an elastic adjustment member that changes the degree of resistance of the spring means against the back tilt of the backrest,
    The elasticity adjusting member is a cam that can be rotated while a person is seated, and the moment applied to the spring means is changed by changing the position at which the rocking load accompanying the back tilt of the backrest acts on the spring means. Changing the degree of resistance of the spring means,
    Rocking chair.
  2. 　脚の上端に設けたベースと、前記ベースに後傾動自在に連結した背フレームとを有しており、前記背フレームのうち傾動中心を挟んで前記背もたれと反対側の前端部に、前記ばね手段に当接する押圧部を設けている一方、
    　前記ばね手段は、前後方向に長い軸心回りに巻かれた圧縮コイルばねであって、その前部を中心にして上下回動するように前記ベースに取り付けられていると共に、その後端は前記背フレームの押圧部で押される荷重受け部になっており、
    　更に、前記背フレームの押圧部は、前記ばね手段の回動を許容するように側面視で前向き凹の円弧状になっている、
    請求項１に記載したロッキング椅子。     A base provided at the upper end of the leg; and a back frame connected to the base so as to be tiltable rearwardly; and the spring means at the front end of the back frame opposite to the backrest across the tilt center. While providing a pressing part to abut
    The spring means is a compression coil spring wound around an axis that is long in the front-rear direction, and is attached to the base so as to rotate up and down around its front part, and its rear end is the back It is a load receiving part that is pressed by the pressing part of the frame,
    Furthermore, the pressing portion of the back frame has an arcuate shape that is concave forward in side view so as to allow rotation of the spring means.
    The rocking chair according to claim 1.
  3. 　前記圧縮コイルばねは前後方向に伸縮するばね保持体に内蔵されている一方、前記カムは周面カムであって外周面には軸心からの距離が相違する複数のカム面を形成しており、前記ばね保持体に、前記周面カムにおける複数のカム面が選択的に当接するカム受け部を設けている、
    請求項２に記載したロッキング椅子。     The compression coil spring is incorporated in a spring holder that expands and contracts in the front-rear direction, while the cam is a circumferential cam, and a plurality of cam surfaces with different distances from the axis are formed on the outer circumferential surface. The spring holder is provided with a cam receiving portion that selectively contacts a plurality of cam surfaces of the circumferential cam.
    The rocking chair according to claim 2.
  4. 　前記ばね保持体は、前後スライド自在に嵌まり合って前記ばねを一端と他端とから支持する２つのばね受けで構成されており、前記２つのばね受けは、前記圧縮コイルばねを予備圧縮させた状態で抜け不能に保持されている、
    請求項３に記載したロッキング椅子。     The spring holding body is composed of two spring receivers that are slidably fitted back and forth to support the spring from one end and the other end. The two spring receivers pre-compress the compression coil spring. Held in an unremovable state,
    The rocking chair according to claim 3.
  5. 　前記ばね手段をカムに密着した状態に保持する離反防止手段が設けられており、前記離反防止手段は、前記カムが回転することを許容する弾性部を有している、
    請求項２に記載したロッキング椅子。     Separation preventing means for holding the spring means in close contact with the cam is provided, and the separation preventing means has an elastic portion that allows the cam to rotate.
    The rocking chair according to claim 2.
  6. 　圧縮コイルばねと、前記圧縮コイルばねをその一端と他端とから支持する２つのばね受けとを備えており、前記２つのばね受けは、伸縮自在に嵌まり合っていると共に、前記圧縮コイルばねを予備圧縮させた状態で離反不能に保持されており、前記２つのばね受けのうち一方には椅子のロッキング荷重が作用する荷重受け部を設け、他方には、椅子の構成部材に回動自在に連結される連結部を設けている、
    ロッキング椅子用のばねユニット。     A compression coil spring; and two spring receivers that support the compression coil spring from one end and the other end thereof, the two spring receivers being fitted in a freely stretchable manner, and the compression coil spring Is held in a state of being pre-compressed, and one of the two spring receivers is provided with a load receiving portion on which a rocking load of the chair acts, and the other is freely rotatable on a component of the chair A connecting portion to be connected to,
    Spring unit for rocking chair.
PCT/JP2012/068095 2011-07-15 2012-07-17 Rocking chair and spring unit used therein WO2013011982A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201280035232.XA CN103747706B (en) 2011-07-15 2012-07-17 Rocking chair
US14/155,748 US9402478B2 (en) 2011-07-15 2014-01-15 Rocking chair and spring unit used therein

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2011-157067 2011-07-15
JP2011-157065 2011-07-15
JP2011-157063 2011-07-15
JP2011157067 2011-07-15
JP2011157065A JP5779021B2 (en) 2011-07-15 2011-07-15 Chair and its seat
JP2011157063A JP5779020B2 (en) 2011-07-15 2011-07-15 Rocking chair
JP2011250621A JP5936104B2 (en) 2011-07-15 2011-11-16 Chair
JP2011-250621 2011-11-16

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06261818A (en) * 1991-06-26 1994-09-20 Okamura Corp Tilting shock absorber of back rest of chair
JPH10179312A (en) * 1996-12-24 1998-07-07 Itoki Crebio Corp Device for elastically adjusting seat or back of chair

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06261818A (en) * 1991-06-26 1994-09-20 Okamura Corp Tilting shock absorber of back rest of chair
JPH10179312A (en) * 1996-12-24 1998-07-07 Itoki Crebio Corp Device for elastically adjusting seat or back of chair

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