JP5884428B2 - Chair back pivoting device - Google Patents

Description

本発明は、椅子の背凭れ枢着装置に係わり、更に詳しくは背凭れ部がロッキング可能な椅子の背凭れ枢着装置に関するものである。   The present invention relates to a backrest pivoting device for a chair, and more particularly to a backrest pivoting device for a chair whose backrest can be locked.

従来から、前記脚部に立設した脚柱の内部に回転可能且つ昇降可能にガスシリンダーを設け、該ガスシリンダーの上端部に前記座部を支持する金属製の座受体を固定するともに、該座受体に前記背凭れ部を支持する背凭れ杆の基部を前記回動軸にてロッキング可能に枢着し、前記座部に設けた前記操作レバーで前記ガスシリンダーを操作して該座部の高さを調節可能とした椅子は各種提供されている。   Conventionally, a gas cylinder is provided in a pedestal standing upright on the leg portion so as to be rotatable and movable up and down, and a metal seat support that supports the seat portion is fixed to an upper end portion of the gas cylinder, A base portion of a backrest supporting the backrest portion is pivotally attached to the seat receiving body so as to be rockable by the rotation shaft, and the gas cylinder is operated by the operation lever provided on the seat portion to operate the seat. Various chairs with adjustable height are available.

通常、固定部材に可動部材を回動可能に枢着するには、両部材に貫通孔を形成し、該貫通孔に回動軸を貫通させ、該回動軸の両端部を抜止め処理することが一般的である。更に、回動軸の基端に拡径した頭部を有し、貫通した先端にＥリング等の抜止め具を装着することも一般的である。しかし、固定部材と可動部材が金属製の場合、金属製の回動軸を貫通させた場合、可動部材を回動させると、該可動部材と回動軸との間、回動軸も共回りする場合には、該回動軸と固定部材との間、更には固定部材と可動部材の接触部で金属同士の摺動音が発生し、更に摺動部で摩耗が激しくり、ガタツキが大きくなるといった問題がある。   Usually, in order to pivotably mount the movable member to the fixed member, through holes are formed in both members, the rotation shaft is passed through the through holes, and both end portions of the rotation shaft are prevented from being removed. It is common. Furthermore, it is common to have a head having an enlarged diameter at the base end of the rotation shaft, and to attach a retaining tool such as an E-ring to the penetrating tip. However, when the fixed member and the movable member are made of metal, when the metal rotation shaft is penetrated, when the movable member is rotated, the rotation shaft also rotates between the movable member and the rotation shaft. In this case, a metal-sliding noise is generated between the rotating shaft and the fixed member, and at the contact part between the fixed member and the movable member. There is a problem of becoming.

特許文献１には、パイプ部材の長手方向と直交する方向に貫通孔を設けて軸を貫通させ、軸とパイプ部材との間に軸受け部材を介在させることにより、軸とパイプ部材との干渉を回避して軸をパイプ部材に取り付けるように構成するに際して、パイプ部材の長手方向に沿って挿入され挿入位置で貫通孔に対応する取付孔を有する軸受け部材を軸とパイプ部材との間に介在させ、軸を貫通孔及び取付孔に貫通させて軸とパイプ部材とを取り付けるようにした軸取付構造が開示されている。ここで、軸受け部材に設けた取付孔の径が前記軸の外周径と略同一であり、前記パイプ部材に設けた貫通孔が取付孔より若干大きく設定されていることにより、軸及びパイプ部材が金属製等の素材からなるものである場合、パイプ部材と軸とが直接接触することによって取付時や使用時に接触音が生じたり、背支桿の作動の円滑さを損なうなど、使用に耐え難いものとなることを解消するのである。しかし、軸の両端には、必要に応じてＥリング等の抜け止め手段が施される。また、座部を支持する金属製のガススプリング受けの貫通孔には、前記軸がそのまま貫通して回動可能に支持されているので、背凭れ部のロッキングの際には、金属同士が擦れることは避けられない。   In Patent Document 1, a through-hole is provided in a direction orthogonal to the longitudinal direction of the pipe member so as to penetrate the shaft, and a bearing member is interposed between the shaft and the pipe member, thereby preventing interference between the shaft and the pipe member. When the shaft is attached to the pipe member while avoiding it, a bearing member inserted along the longitudinal direction of the pipe member and having an attachment hole corresponding to the through hole at the insertion position is interposed between the shaft and the pipe member. A shaft mounting structure is disclosed in which a shaft and a pipe member are mounted by passing the shaft through a through hole and a mounting hole. Here, the diameter of the mounting hole provided in the bearing member is substantially the same as the outer peripheral diameter of the shaft, and the through hole provided in the pipe member is set slightly larger than the mounting hole, so that the shaft and the pipe member are If it is made of a material such as metal, the pipe member and shaft are in direct contact with each other, making contact noise during installation or use, or impairing the smooth operation of the back support rod. It will be solved. However, both ends of the shaft are provided with retaining means such as an E-ring as necessary. Further, since the shaft passes through the through hole of the metal gas spring support that supports the seat portion so as to be rotatable, the metal rubs when the backrest portion is locked. It is inevitable.

特開２００３−２７８７２１号公報JP 2003-278721 A

そこで、本発明が前述の状況に鑑み、解決しようとするところは、座部の座受体に背凭れ部を支持する背凭れ杆を枢着し、ロッキング可能となした椅子において、座受体、背凭れ杆及び回動軸が共に金属製であっても金属同士が摺動せず、円滑に回動可能に支持することができ、また回動軸にＥリング等の抜止め手段を用いなくても抜止めが自然になされ、組立ても容易である椅子の背凭れ枢着装置を提供する点にある。   Therefore, in view of the above-described situation, the present invention intends to solve the problem in that the seat receiver is provided in a chair that can be locked by pivoting a backrest supporting the backrest on the seat receiver of the seat. Even if the backrest and the rotation shaft are both made of metal, the metals do not slide with each other and can be supported so as to be able to rotate smoothly, and a retaining means such as an E-ring is used for the rotation shaft. The object of the present invention is to provide a backrest pivoting device for a chair that can be prevented from being pulled out naturally without being easily assembled.

本発明は、前述の課題解決のために、座部の座受体に背凭れ部を支持する背凭れ杆を枢着し、ロッキング可能となした椅子において、前記座部は、合成樹脂製の座アウターと該座アウターの下面に取付けた金属製の座受体を備え、前記座アウターの下面両側部に前後方向に延びた垂下壁を有するとともに、両垂下壁の間に前記座受体が位置した構造であり、左右一対の金属製の背凭れ杆を有し、一方の背凭れ杆の基部には非円孔を備え、他方の背凭れ杆の基部には円孔を備え、金属製の回動軸を前記座受体の両側面板に形成した通孔に貫通した状態で、該回動軸の一端部に形成した非円柱部を一方の前記背凭れ杆の非円孔に非回転となした嵌合状態とし、該回動軸の他端部を他方の前記背凭れ杆の円孔に挿入状態とし、両背凭れ杆から突出した前記回動軸の両端を前記両垂下壁の間に位置させてなることを特徴とする椅子の背凭れ枢着装置を構成した（請求項１）。 In order to solve the above-mentioned problems, the present invention provides a chair in which a backrest that supports the backrest is pivotally attached to a seat receiver of the seat so that the seat can be locked, and the seat is made of a synthetic resin. comprising a metal seat receptacle mounted on the underside of the seat outer and the seat outer, which has a depending wall extending in the longitudinal direction on the lower surface sides of the seat outer, the seat receiving body between both hanging wall a position structure has a backrest rods made pair of metal, with a non-circular hole in the base of one of the backrest rod, provided with a circular hole in the base of the other of the backrest rod, made of metal The non-cylindrical portion formed at one end of the pivot shaft is not rotated into the non-circular hole of one of the backrests in a state where the pivot shaft is passed through the through holes formed in the both side plates of the seat receiver. and ungated was fitted state, the other end portion of the shaft該回as the other insertion state into a circular hole of the backrest rods protrude from both backrest rod Both ends of the pivot shaft to constitute a backrest pivot device of the chair characterized by comprising by located between the two depending wall (claim 1).

ここで、前記回動軸の非円柱部は、金属丸棒の直径方向の両側に凸部を形成した形状であり、前記背凭れ杆の非円孔は、円孔の直径部に前記凸部を受け入れる凹部を形成した形状である（請求項２）。 Here, the non-cylindrical portion of the rotating shaft has a shape in which convex portions are formed on both sides in the diameter direction of the metal round bar, and the non-circular hole of the backrest ridge is the convex portion on the diameter portion of the circular hole. It is the shape which formed the recessed part which accepts (Claim 2).

そして、前記座受体の両側面板には、前記回動軸の直径よりも大きな直径の通孔を有し、該通孔には、外側にフランジ部を有する合成樹脂製のブッシュをそれぞれ嵌合状態で設け、前記回動軸は両ブッシュを貫通状態で回動可能に支持されていることがより好ましい（請求項３）。 Both side plates of the seat receiver have through holes having a diameter larger than the diameter of the rotating shaft, and synthetic resin bushes having flange portions on the outside are fitted in the through holes, respectively. provided in a state, wherein the rotation shaft is more preferably is rotatably supported the bushes in the through state (claim 3).

また、前記座受体の両側面板に形成した通孔の周囲には、該側面板の内側に立ち上がった円筒部を一体的に有していることも好ましい（請求項４）。 Around the hole formed on both the side plates of the seat receptacle, it is also preferable to integrally has a cylindrical portion that rises inside of the side plate (claim 4).

以上にしてなる請求項１に係る発明の椅子の背凭れ枢着装置は、座部の座受体に背凭れ部を支持する背凭れ杆を枢着し、ロッキング可能となした椅子において、前記座部は、合成樹脂製の座アウターと該座アウターの下面に取付けた金属製の座受体を備え、前記座アウターの下面両側部に前後方向に延びた垂下壁を有するとともに、両垂下壁の間に前記座受体が位置した構造であり、左右一対の金属製の背凭れ杆を有し、一方の背凭れ杆の基部には非円孔を備え、他方の背凭れ杆の基部には円孔を備え、金属製の回動軸を前記座受体の両側面板に形成した通孔に貫通した状態で、該回動軸の一端部に形成した非円柱部を一方の前記背凭れ杆の非円孔に非回転となした嵌合状態とし、該回動軸の他端部を他方の前記背凭れ杆の円孔に挿入状態とし、両背凭れ杆から突出した前記回動軸の両端を前記両垂下壁の間に位置させてなるので、背凭れ部のロッキング時に背凭れ杆と回動軸が共回りするので、背凭れ杆と回動軸との間で摺動音が発生せず、また摩耗も生じず、また前記回動軸にＥリング等の抜止め手段を用いなくても抜止めが自然になされ、組立ても単に回動軸を両背凭れ杆と座受体の側面板に挿入した後、該座受体を座アウターの下面に取付けるだけであるので極めて簡単である。 The chair backrest pivoting device of the invention according to claim 1 as described above is a chair in which a backrest heel supporting the backrest portion is pivotally attached to the seat receiver of the seat portion, and the chair can be locked. the seat includes a metal seat receptacle mounted on the lower surface of the synthetic resin seat outer and the seat outer, which has a depending wall extending in the longitudinal direction on the lower surface sides of the seat outer, both hanging wall a structure in which the seat receptacle is located between the have a backrest rods made pair of metal, the base of one of the backrest rod with a non-circular hole, the base of the other of the backrest rod is provided with a circular hole, in a state in which a metal pivot shaft extending through the through holes formed on both side plates of the seat receptacle, one of the backrest a non-circular cylindrical portion formed at one end of the pivoting shaft and fitting state in which no a non-rotating to the non-circular hole of the rod, and insertion state of the other end portion of the shaft該回the circular hole of the other of the backrest rod Since both ends of the pivot shaft which projects from both backrest rod made by positioning between the two downward wall, since the backrest lever and the pivot axis when the backrest portion of the locking rotate together, the backrest rod No sliding noise occurs between the rotating shaft and the rotating shaft, and no wear occurs, and the locking shaft can be removed naturally without using a retaining means such as an E-ring. This is very simple since the pivot shaft is inserted into both the backrest and the side plate of the seat receiver, and then the seat receiver is simply attached to the lower surface of the seat outer.

請求項２によれば、前記回動軸の非円柱部は、金属丸棒の直径方向の両側に凸部を形成した形状であり、前記背凭れ杆の非円孔は、円孔の直径部に前記凸部を受け入れる凹部を形成した形状であるので、汎用の加工装置を用いて加工することができ、しかも非円柱部が非円孔に嵌合した状態では確実に両部材が非回転となる。 According to claim 2, the non-cylindrical portion of the rotating shaft has a shape in which convex portions are formed on both sides in the diameter direction of the metal round bar, and the non-circular hole of the backrest heel is a diameter portion of the circular hole. Since the concave portion for receiving the convex portion is formed in the shape, it can be processed using a general-purpose processing device, and both the members are surely non-rotated when the non-cylindrical portion is fitted in the non-circular hole. Become.

請求項３によれば、前記座受体の両側面板には、前記回動軸の直径よりも大きな直径の通孔を有し、該通孔には、外側にフランジ部を有する合成樹脂製のブッシュをそれぞれ嵌合状態で設け、前記回動軸は両ブッシュを貫通状態で回動可能に支持されているので、ロッキングの際に前記背凭れ杆に対して回動軸が回転することがなく、前記座受体に対してブッシュを軸受として回転するので、またブッシュのフランジ部が、背凭れ杆と座受体の側面板との間でスペーサーとして機能するので、金属同士の擦れ音が発生することがなく、摩耗も少なくなり、回動動作が円滑である。 According to claim 3, the both side plates of the seat receiver have a through-hole having a diameter larger than the diameter of the rotating shaft, and the through-hole is made of a synthetic resin having a flange portion on the outside. Since the bushes are provided in a fitted state, and the pivot shaft is supported so as to be pivotable with both bushes penetrated , the pivot shaft does not rotate with respect to the backrest when locking. Since the bush rotates with respect to the seat receiver and the flange portion of the bush functions as a spacer between the backrest heel and the side plate of the seat receiver, a metal rubbing noise is generated. And wear is reduced, and the turning operation is smooth.

請求項４によれば、前記座受体の両側面板に形成した通孔の周囲には、該側面板の内側に立ち上がった円筒部を一体的に有しているので、通孔の内方に有する円筒部が前記ブッシュにかかる荷重を分散することができ、該ブッシュの耐久性が高くなるのである。 According to claim 4, around the hole formed on both the side plates of the seat receptacle, so integrally has a cylindrical portion that rises inside of the side plates, the inside of the through hole The cylindrical part which has can disperse | distribute the load concerning the said bush, and durability of this bush becomes high.

本発明に係る椅子の正面図である。It is a front view of the chair concerning the present invention. 同じく椅子の縦断側面図である。It is the longitudinal side view of a chair similarly. 同じく椅子の分解斜視図である。It is an exploded perspective view of a chair similarly. 座アウターに操作レバーを揺動可能に取付けた状態を裏面側から見た斜視図である。It is the perspective view which looked at the state which attached the operation lever to the seat outer so that rocking was possible from the back side. 同じく座アウターに操作レバーを揺動可能に取付けた状態の部分拡大斜視図である。It is a partial expansion perspective view of the state where the operation lever was similarly attached to the seat outer so that rocking was possible. 同じく座アウターに操作レバーを揺動可能に取付けた状態の部分拡大縦断側面図である。It is a partial expanded vertical side view of the state which similarly attached the operation lever to the seat outer so that rocking was possible. 本実施形態の背凭れ杆を示し、（ａ）は背凭れ杆の斜視図、（ｂ）は背凭れ杆の先端部の側面図、（ｃ）は背凭れ杆の先端部の斜視図である。The backrest heel of this embodiment is shown, (a) is a perspective view of a backrest heel, (b) is a side view of the front-end | tip part of a backrest heel, (c) is a perspective view of the front-end | tip part of a backrest heel. . 背凭れ杆を座受体にロッキング可能に取付けた枢着部を示す部分縦断正面図である。It is a partial vertical front view which shows the pivot part which attached the backrest heel to the seat receiving body so that locking was possible. 同じく背凭れ杆の枢着部の部分竪断面図である。FIG. 6 is a partial cross-sectional view of the pivotally attached portion of the backrest. 同じく背凭れ杆の枢着部を示し、（ａ）は部分側面図、（ｂ）は部分横断平面図である。The pivot attachment part of a backrest is also shown, (a) is a partial side view, and (b) is a partial transverse plan view. 本実施形態の化粧カバーを示す全体斜視図である。It is a whole perspective view which shows the decorative cover of this embodiment. 座アウターと背凭れ杆と化粧カバーとの関係を示す部分縦断正面図である。It is a partial vertical front view which shows the relationship between a seat outer, a backrest heel, and a makeup | decoration cover. 座部と背凭れ部の関係を示し，（ａ）は背凭れ部が無負荷状態の部分側面図、（ｂ）は背凭れ部が後傾したロッキング状態の部分側面図である。The relationship between a seat part and a backrest part is shown, (a) is a partial side view in which the backrest part is in an unloaded state, and (b) is a partial side view in a locking state in which the backrest part is tilted backward. 座部と背凭れ部の関係を示し，（ａ）は背凭れ部が無負荷状態の部分縦断側面図、（ｂ）は背凭れ部が後傾したロッキング状態の部分縦断側面図である。The relationship between a seat part and a backrest part is shown, (a) is a partial longitudinal side view of the backrest part in an unloaded state, and (b) is a partial longitudinal side view of a rocking state in which the backrest part is tilted backward.

次に、添付図面に示した実施形態に基づき、本発明を更に詳細に説明する。図１〜図３は本発明に係る椅子を示し、図中符号１は脚部、２は座部、３は背凭れ部、４は背凭れ杆、５は回動軸、６は操作レバー、７は化粧カバーをそれぞれ示している。   Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings. 1 to 3 show a chair according to the present invention, in which 1 is a leg, 2 is a seat, 3 is a backrest, 4 is a backrest, 5 is a pivot, 6 is an operating lever, Reference numeral 7 denotes a decorative cover.

本発明に係る椅子は、前記脚部１に立設した脚柱８の内部に回転可能且つ昇降可能にガスシリンダー９を設け、該ガスシリンダー９の上端部に前記座部２を支持する金属製の座受体１０を固定するともに、該座受体１０に前記背凭れ部３を支持する背凭れ杆４の基部を前記回動軸５にてロッキング可能に枢着し、前記座部２に設けた前記操作レバー６で前記ガスシリンダー９を操作して該座部の高さを調節可能とし、そしてロッキングの際に可動部での指詰めを防止する目的と外観性の向上を目的として前記背凭れ杆４の下部を前記化粧カバー７で覆った構造のものである。尚、前記背凭れ部３の後傾に対する抵抗力を付与するために、前記背凭れ杆４の基部に設けた傾動板１１と前記座受体１０との間に、抵抗力を調節可能な弾性付勢手段１２を設けている。尚、本発明に関係のない構造は他の公知な構造で置き換えることができる。   The chair according to the present invention is provided with a gas cylinder 9 that is rotatable and can be moved up and down inside a pedestal 8 that is erected on the leg 1, and is made of metal that supports the seat 2 on the upper end of the gas cylinder 9. The base of the backrest 4 that supports the backrest 3 is fixed to the seat base 10 so that it can be locked by the rotating shaft 5. The gas cylinder 9 is operated by the provided operating lever 6 so that the height of the seat portion can be adjusted, and for the purpose of preventing finger jamming at the movable portion and improving the appearance when locking. The lower part of the backrest ridge 4 is covered with the decorative cover 7. In addition, in order to provide the resistance against the backward tilting of the backrest 3, an elastic capable of adjusting the resistance between the tilting plate 11 provided at the base of the backrest 4 and the seat support 10. Biasing means 12 is provided. It should be noted that structures not related to the present invention can be replaced with other known structures.

前記座部２は、合成樹脂製の座アウター１３の下面に前記座受体１０を取付けるとともに、該座アウター１３の上面に、モールドウレタン製の座クッション１４を張地１５で覆って取付けた構造である。前記座部２の両側部に肘掛け１６，１６を取付けるには、前記座アウター１３の上面に肘補強金具１７を取付け、前記肘掛け１６の固定部を座アウター１３の下面側部に位置させ、前記肘補強金具１７にネジ止めする。   The seat portion 2 has a structure in which the seat receiver 10 is attached to the lower surface of a synthetic resin outer seat 13, and a seat cushion 14 made of molded urethane is covered with a tension fabric 15 on the upper surface of the outer seat 13. It is. In order to attach the armrests 16 and 16 to both sides of the seat 2, the elbow reinforcement bracket 17 is attached to the upper surface of the seat outer 13, the fixing portion of the armrest 16 is positioned on the lower surface side of the seat outer 13, Screw on the elbow reinforcement 17.

前記背凭れ部３は、合成樹脂製の背インナー１８の前面側にウレタン製の背クッション１９を配置し、その表面を張地２０で覆うとともに、該張地２０の周縁部を前記背インナー１８の背面に回り込ませてその周縁部を緊縛して保持し、そして前記背インナー１８の背面側の中央部に前記背凭れ杆４の上部を取付けるとともに、背面側から合成樹脂製の背アウター２１を嵌着して該背アウター２１の周囲で前記張地２０の周縁部を圧迫保持した構造である。   The backrest 3 is provided with a urethane back cushion 19 on the front side of the back inner 18 made of synthetic resin, the surface thereof is covered with a tension fabric 20, and the peripheral portion of the tension fabric 20 is covered with the back inner 18. And the upper edge of the backrest ridge 4 is attached to the center of the back inner side of the back inner 18 and a synthetic resin back outer 21 is attached from the back side. It is a structure in which the peripheral edge of the tension fabric 20 is pressed and held around the back outer 21 by fitting.

更に詳しく各部の詳細を添付図面に基づいて説明する。先ず、前記座アウター１３は、図４に示すように、下面側に多数のリブ２２，…を縦横に設けて強度を高めた合成樹脂製の一体成形品であり、下面の両側部に前後方向に延びた垂下壁２３，２３が形成され、両垂下壁２３，２３は前側において連結壁２４で連続している。特に、前記両垂下壁２３，２３は、どのリブ２２，…よりも大きく下方へ突出している。そして、前記両垂下壁２３，２３と連結壁２４で囲まれた空間の四隅には、取付孔２５，…が貫通形成されている。一方、図１〜図３及び図６に示すように、金属製の前記座受体１０は断面ハット形にプレス成形され、上方開放したボックス部２６の上端周縁に外向きに補強板２７を形成したものである。更に、前記座受体１０のボックス部２６の底面中央部には、前記ガスシリンダー９の上端部を固定する固定部２８が形成され、該ガスシリンダー９の作動ピン２９が該固定部２８を通して前記ボックス部２６の内部に露出するようになっている。そして、前記座受体１０の補強板２７を前記両垂下壁２３，２３と連結壁２４で囲まれた空間に嵌合した状態で、両側の補強板２７，２７と前記取付孔２５，…を下方から貫通させた固定ネジ３０と爪付ナット３１とで締め付けて取付けるのである。   Further details of each part will be described with reference to the accompanying drawings. First, as shown in FIG. 4, the seat outer 13 is an integrally molded product made of a synthetic resin in which a large number of ribs 22,... The hanging walls 23, 23 extending in a straight line are formed, and both the hanging walls 23, 23 are continuous with the connecting wall 24 on the front side. In particular, both the hanging walls 23, 23 protrude downward larger than any of the ribs 22,. And the attachment holes 25 and ... are penetrated and formed in the four corners of the space enclosed by both the said hanging walls 23 and 23 and the connection wall 24. As shown in FIG. On the other hand, as shown in FIGS. 1 to 3 and FIG. 6, the metal seat support 10 is press-molded into a cross-sectional hat shape, and a reinforcing plate 27 is formed outwardly at the upper end periphery of the box portion 26 opened upward. It is a thing. Further, a fixing portion 28 for fixing the upper end portion of the gas cylinder 9 is formed at the center of the bottom surface of the box portion 26 of the seat receiver 10, and the operating pin 29 of the gas cylinder 9 passes through the fixing portion 28 to It is exposed inside the box portion 26. Then, in a state where the reinforcing plate 27 of the seat receiver 10 is fitted in the space surrounded by the hanging walls 23, 23 and the connecting wall 24, the reinforcing plates 27, 27 on both sides and the mounting holes 25,. The fixing screw 30 penetrated from below and the claw nut 31 are tightened and attached.

次に、図４〜図６に基づいて、前記ガスシリンダー９の作動ピン２９を操作して座部２の高さを調節するための前記操作レバー６の取付構造を説明する。前記操作レバー６は、１本の金属棒から回動可能に支持される軸部３２と、該軸部３２の基部側にハンドル部３３と先端側に作用部３４とをクランク状に屈曲して形成するとともに、ハンドル部３３に合成樹脂製のレバーキャップ３５を固定した構造である。   Next, based on FIGS. 4-6, the attachment structure of the said operation lever 6 for operating the action | operation pin 29 of the said gas cylinder 9 and adjusting the height of the seat part 2 is demonstrated. The operating lever 6 is formed by bending a shaft portion 32 rotatably supported from a single metal rod, a handle portion 33 on the base side of the shaft portion 32, and an action portion 34 on the distal end side in a crank shape. While being formed, a synthetic resin lever cap 35 is fixed to the handle portion 33.

そして、前記座アウター１３の裏面で前記両垂下壁２３，２３と連結壁２４で囲まれた空間内に、前記操作レバー６の軸部３２を回動可能に嵌合する軸受部３６を一体成形している。本実施形態では、間隔を隔てて二つの軸受部３６，３６を同軸となるように成形している。ここで、前記軸受部３は、裏面側に突出した一対の嵌合片３６Ａ，３６Ａからなり、両嵌合片３６Ａ，３６Ａの間に前記軸部３２を回動可能に嵌合し、両嵌合片３６Ａ，３６Ａの先端内側に対向するように形成した突出部で抜止めをする公知の構造である。前記軸受部３６，３６は、一方の前記垂下壁２３に沿って形成され、その軸受部３６の近傍の前記垂下壁２には開口３７を形成している。前記開口３７は、前記座アウター１３を成形する際に、表側の成形金型の突起を抜くことによって形成する。   Then, a bearing portion 36 for integrally fitting the shaft portion 32 of the operation lever 6 to be rotatable is integrally formed in a space surrounded by the hanging walls 23 and 23 and the connecting wall 24 on the back surface of the outer seat 13. doing. In the present embodiment, the two bearing portions 36 and 36 are formed so as to be coaxial with an interval. Here, the bearing portion 3 is composed of a pair of fitting pieces 36A and 36A protruding to the back surface side, and the shaft portion 32 is rotatably fitted between the fitting pieces 36A and 36A. This is a known structure in which the protrusions formed so as to face the inner ends of the combined pieces 36A and 36A are secured. The bearing portions 36 and 36 are formed along one of the hanging walls 23, and an opening 37 is formed in the hanging wall 2 in the vicinity of the bearing portion 36. The opening 37 is formed by removing the protrusion of the front mold when the seat outer 13 is molded.

前記操作レバー６を前記座アウター１３の裏面側に装着するには、前記垂下壁２３の外側から作用部３４を前記開口３に挿入し、屈曲部を通過させて前記軸部３２まで開口３７を通過させ、それから該軸部３２を前記軸受部３６，３６に回動可能に嵌着する。その後、前記座受体１０を前述のように前記座アウター１に取付け、固定部２８にガスシリンダー９の上端部を固定すると、前記操作レバー６の作用部３４の先端部が、前記ガスシリンダー９の作動ピン２９の直上に位置するようになる。通常、前記操作レバー６のレバーキャップ３５を含むハンドル部３３の重量は、前記作用部３４の重量よりも重いため、前記ハンドル部３３は自重で下がり、前記作用部３４は上昇した位置にある。そして、前記レバーキャップ３５を持ち上げることにより、前記軸部３２を支点として前記作用部３４が降下して前記ガスシリンダー９の作動ピン２９を押し込んでロックを解除し、前記座部２の高さを調節できるようになる。ここで、前記操作レバー６の軸部３２は、前記軸受部３６，３６に嵌合しているので、その摺動摩擦によって不必要に操作レバー６がバタつくことはない。尚、前記垂下壁２３に設けた開口３７、前記操作レバー６のハンドル部３３の上下変位を許容できるように上下に長い形状となっている。   In order to mount the operation lever 6 on the back side of the seat outer 13, the action part 34 is inserted into the opening 3 from the outside of the hanging wall 23, and the opening 37 is passed through the bent part to the shaft part 32. Then, the shaft portion 32 is rotatably fitted to the bearing portions 36 and 36. Thereafter, when the seat receiver 10 is attached to the seat outer 1 as described above and the upper end portion of the gas cylinder 9 is fixed to the fixing portion 28, the distal end portion of the action portion 34 of the operation lever 6 is moved to the gas cylinder 9. It comes to be located just above the actuating pin 29. Usually, since the weight of the handle portion 33 including the lever cap 35 of the operation lever 6 is heavier than the weight of the action portion 34, the handle portion 33 is lowered by its own weight, and the action portion 34 is in the raised position. Then, by lifting the lever cap 35, the action part 34 descends with the shaft part 32 as a fulcrum and pushes the operating pin 29 of the gas cylinder 9 to release the lock, thereby increasing the height of the seat part 2. You can adjust it. Here, since the shaft portion 32 of the operation lever 6 is fitted to the bearing portions 36, 36, the operation lever 6 does not flutter unnecessarily due to its sliding friction. The opening 37 provided on the hanging wall 23 and the handle portion 33 of the operation lever 6 have a vertically long shape so as to allow vertical displacement.

このように、前記操作レバー６を前記座アウター１３の裏面側に形成した軸受部３６，３６に開口３７を通して嵌着するだけであるので、従来のように金属製の座受体１０に加工し、また他の軸受部品を取付けていたものより、製造工程が少なくなり、部品点数も少なくコスト低減化に寄与するのである。また、前記開口３７は、前記垂下壁２３を分断してないので、該開口３７を設けても曲げ強度を保つことができる。   Thus, since the operating lever 6 is simply fitted through the opening 37 to the bearing portions 36 and 36 formed on the back surface side of the seat outer 13, it is processed into a metal seat receiving body 10 as in the prior art. In addition, the number of manufacturing processes is reduced and the number of parts is reduced compared to other bearing parts, which contributes to cost reduction. Further, since the opening 37 does not divide the hanging wall 23, the bending strength can be maintained even if the opening 37 is provided.

しかし、前記操作レバー６のレバーキャップ３５を持ち上げると、前記軸部３２が軸受部３６から外れる方向に力が加わるので、必要以上に強く持ち上げた場合に、前記軸部３２が軸受部３６から脱落するのを防止するために、図５に示すように、前記軸受部３６，３６の間に位置する前記軸部３２の下側に金属製又は合成樹脂製の規制板３８を前記座アウター１３に取付けて、該軸部３２の下方変位を規制することも好ましい。具体的には、前記座アウター１３に一体成形した嵌合部３９に前記規制板３８の一端を嵌合保持するとともに、該規制板３８の他端をネジ４０で座アウター１３の円筒形の取付台４１に螺合する。   However, when the lever cap 35 of the operation lever 6 is lifted, a force is applied in a direction in which the shaft portion 32 is disengaged from the bearing portion 36. Therefore, when the lever portion 35 is lifted more strongly than necessary, the shaft portion 32 falls off the bearing portion 36. In order to prevent this, as shown in FIG. 5, a restriction plate 38 made of metal or synthetic resin is provided on the seat outer 13 below the shaft portion 32 located between the bearing portions 36, 36. It is also preferable to attach and restrict the downward displacement of the shaft portion 32. Specifically, one end of the restriction plate 38 is fitted and held in a fitting portion 39 integrally formed with the outer seat 13, and the other end of the restriction plate 38 is attached to the cylindrical shape of the outer seat 13 with a screw 40. Screw onto the base 41.

次に、図１〜図３及び図７に基づいて、前記背凭れ杆４と背凭れ部３との連結構造を説明する。本実施形態では、２本の同一外形の側面視略く字状の背凭れ杆４，４を平行に配置し、基部４２を前記座受体１０に回動軸５にて上下に回動可能に枢着し、前記背凭れ部３がロッキング可能となっている。２本の背凭れ杆４，４は、略水平な基部４２，４２において前記傾動板１１を溶接して一体化し、先端部の立上り部４３，４３において帯状の取付板４４を渡して溶接して一体化している。前記背凭れ杆４は、金属丸パイプで作製し、前記立上り部４３の先端をプレス加工して偏平な固定板４５を、所定角度を設けて一体形成している。   Next, a connection structure between the backrest 4 and the backrest 3 will be described with reference to FIGS. In this embodiment, two substantially back-shaped backrest ridges 4, 4 having the same outer shape in side view are arranged in parallel, and the base 42 can be rotated up and down on the seat receiver 10 by the rotation shaft 5. The backrest 3 can be locked. The two backrest ridges 4, 4 are integrated by welding the tilting plate 11 at the substantially horizontal base portions 42, 42, and are welded by passing the belt-like mounting plate 44 at the rising portions 43, 43 at the front end portions. It is integrated. The backrest 4 is made of a metal round pipe, and a flat fixing plate 45 is integrally formed at a predetermined angle by pressing the tip of the rising portion 43.

更に詳しくは、図７に示すように、前記背凭れ杆４は、前記固定板４５の背面に丸パイプ形状を保ったまま前記立上り部４３の上端が交差した形状となっており、該固定板４５の前面は平面であり、背面は中央部まで立上り部４３の金属丸パイプが円形断面を保った状態で連続している。見方を変えれば、板状の固定板４５の背面の中央部から一端部にかけて、斜めに切断した金属丸パイプの切断面を接合した形状となっている。図７（ｂ）に示すように、前記固定板４５に対する立上り部４３の交差する角度θは、１５〜５０度の範囲で設定可能であり、本実施形態では約２３度であるが、１５〜３０度の角度が好ましい。このような形態に金属丸パイプから固定板４５をプレス加工して形成することにより、前述の角度θは広い範囲で設定できる。前記固定板４５の背面の中央部まで金属丸パイプで支持されるので、該固定板４５に対する曲げ剛性が高くなり、耐久性の向上が図れる。勿論、この形状は、前記固体板４５を別部材として、前記立上り部４３の先端斜め切断面に溶接することにより実現できるが、本実施形態ではこれをプレス加工して一体形成したことに特徴がある。   More specifically, as shown in FIG. 7, the backrest ridge 4 has a shape in which the upper end of the rising portion 43 intersects with the back surface of the fixed plate 45 while maintaining a round pipe shape. The front surface of 45 is a flat surface, and the rear surface is continuous up to the center with the metal round pipe of the rising portion 43 maintaining a circular cross section. In other words, the cut surface of the metal round pipe cut obliquely is joined from the center of the back surface of the plate-shaped fixing plate 45 to one end. As shown in FIG. 7B, the angle θ at which the rising portion 43 intersects with the fixed plate 45 can be set in the range of 15 to 50 degrees, and in this embodiment is about 23 degrees, An angle of 30 degrees is preferred. By forming the fixed plate 45 from a metal round pipe in such a form by pressing, the aforementioned angle θ can be set in a wide range. Since the metal plate is supported up to the center of the back surface of the fixed plate 45, the bending rigidity with respect to the fixed plate 45 is increased, and the durability can be improved. Of course, this shape can be realized by welding the solid plate 45 as a separate member to the obliquely cut end surface of the rising portion 43, but this embodiment is characterized by being integrally formed by pressing. is there.

前記背凭れ杆４の固定板４５には取付孔４６を穿設し、また前記取付板４４の両端部に段状に折曲形成した取付片４７にも取付孔４８を形成し、図１及び図２に示すように、前記背インナー１８の背面の４箇所に面接触状態でネジ４９，…で取付けている。そして、これらの取付構造は、前記背インナー１８の背面側に前記背アウター２１を取付けることにより隠蔽される。ここで、前記固定板４５は、平面となっており、前記背インナー１８の背面に対する接触面積が広くなるので、該背インナー１８に対して荷重を分散して支持することができ、応力集中やガタツキを抑制し、耐久性を高めることができる。また、前記背凭れ杆４の固定板４５が偏平なので、前記背インナー１８に取付ける際の位置決めが容易になるとともに、背凭れ部３の前後の厚みを抑制することができる。ここで、前記取付片４７，４７は、ネジ止めではなく前記背インナー１８の背面に形成した係合部にスライド係合させても良い。   Mounting holes 46 are formed in the fixing plate 45 of the backrest 4, and mounting holes 48 are also formed in mounting pieces 47 that are bent at both ends of the mounting plate 44. As shown in FIG. 2, it is attached with screws 49,. These attachment structures are concealed by attaching the back outer 21 to the back side of the back inner 18. Here, the fixing plate 45 is flat and has a large contact area with the back surface of the back inner 18 so that the load can be distributed and supported with respect to the back inner 18, stress concentration and It is possible to suppress backlash and enhance durability. Further, since the fixing plate 45 of the backrest ridge 4 is flat, positioning when attaching to the back inner 18 is facilitated, and the thickness of the backrest portion 3 before and after can be suppressed. Here, the mounting pieces 47 may be slidably engaged with an engaging portion formed on the back surface of the back inner 18 instead of screwing.

次に、図１〜図３、図７〜図１０に基づいて、前記背凭れ杆４を前記座受体１０に回動軸５で枢着する構造を説明する。前記座アウター１３の両垂下壁２３，２３と連結壁２４で囲まれた空間に前記座受体１０を取付けた状態では、図８に示すように、前記垂下壁２３と座受体１０のボックス部２６の側面板５０の間に空間が形成され、この左右の空間内に前記背凭れ杆４，４の基部４２，４２をそれぞれ位置させて、前記ボックス部２６の側面板５０，５０を貫通させた回動軸５で回動可能に支持するのである。図７に示すように、一方の前記背凭れ杆４の基部４２に非円孔５１を形成するとともに、他方の前記背凭れ杆４の基部４２に円孔５２を形成する。前記回動軸５は、金属丸棒の一端部を前記非円孔５１に非回転で嵌合する非円柱部５３とし、具体的には金属丸棒をプレス加工して直径方向の両側に凸部５３Ａ，５３Ａを形成している。ここで、前記非円孔５１は、円孔５２の直径部に前記凸部５３Ａ，５３Ａを受け入れる凹部５１Ａ，５１Ａを形成した形状であるが、この非円孔５１と非円柱部５３の関係自体は公知の構造である。   Next, based on FIGS. 1-3 and FIGS. 7-10, the structure which pivotally attaches the said backrest 4 to the said seat receptacle 10 with the rotating shaft 5 is demonstrated. In the state where the seat receiver 10 is attached to the space surrounded by the both hanging walls 23 and 23 of the outer seat 13 and the connecting wall 24, the box of the hanging wall 23 and the seat receiver 10 is shown in FIG. A space is formed between the side plates 50 of the portion 26, and the base portions 42 and 42 of the backrest ridges 4 and 4 are respectively positioned in the left and right spaces so as to penetrate the side plates 50 and 50 of the box portion 26. The pivot shaft 5 is supported so as to be pivotable. As shown in FIG. 7, a non-circular hole 51 is formed in the base portion 42 of one of the backrest ridges 4, and a circular hole 52 is formed in the base portion 42 of the other backrest ridge 4. The rotating shaft 5 has one end of a metal round bar as a non-cylindrical part 53 that fits into the non-circular hole 51 in a non-rotating manner. Specifically, the metal round bar is pressed to project both sides in the diameter direction. Portions 53A and 53A are formed. Here, the non-circular hole 51 has a shape in which concave portions 51A and 51A for receiving the convex portions 53A and 53A are formed in the diameter portion of the circular hole 52. The relationship between the non-circular hole 51 and the non-cylindrical portion 53 itself. Is a known structure.

前記座受体１０のボックス部２６の両側面板５０，５０には、前記回動軸５の直径よりも十分に大きな直径の通孔５４，５４を内方へ向けてバーリング加工して形成している。つまり、前記側面板５０の内側で通孔５４の周囲には円筒部を有している。そして、前記側面板５０の通孔５４には、外側にフランジ部５６を有する合成樹脂製のブッシュ５５をそれぞれ嵌着している。そして、前記回動軸５の円柱部を前記背凭れ杆４の非円孔５１から挿入し、二つのブッシュ５５，５５を貫通して他方の背凭れ杆４の円孔５２に挿入すると同時に、前記非円柱部５３を設けた基部を非円孔５１に嵌合する。前記回動軸５の長さは、前記両垂下壁２３，２３の間隔よりも短く、両端部がそれぞれ両背凭れ杆４，４から突出する長さを有している。前記座受体１０のボックス部２６に、前記両背凭れ杆４，４の基部４２，４２を回動軸５で回動可能に連結した状態で、該座受体１０を座アウター１３に取付けることにより、前記回動軸５が両垂下壁２３，２３の間に位置し、該回動軸５の両端を当止することにより、該回動軸５の先端にＥリング等の抜止め用部材を装着しなくても抜止めがなされるのである。しかし、通常は、前記回動軸５の両端は前記両垂下壁２３，２３には接触しないように設定されている。   On both side plates 50, 50 of the box portion 26 of the seat receiver 10, through holes 54, 54 having a diameter sufficiently larger than the diameter of the rotating shaft 5 are formed by burring inward. Yes. That is, a cylindrical portion is provided around the through hole 54 inside the side plate 50. And the synthetic resin bush 55 which has the flange part 56 on the outer side is each fitted in the through-hole 54 of the said side plate 50. As shown in FIG. At the same time, the cylindrical portion of the pivot shaft 5 is inserted from the non-circular hole 51 of the backrest 4, passes through the two bushes 55, 55, and is inserted into the circular hole 52 of the other backrest 4. The base provided with the non-cylindrical portion 53 is fitted into the non-circular hole 51. The length of the rotating shaft 5 is shorter than the interval between the two hanging walls 23, 23, and both ends protrude from the backrests 4, 4 respectively. The seat receiver 10 is attached to the seat outer 13 in a state in which the base portions 42 and 42 of the backrest ridges 4 and 4 are rotatably connected to the box portion 26 of the seat receiver 10 by the rotation shaft 5. As a result, the rotating shaft 5 is positioned between the two hanging walls 23, 23, and both ends of the rotating shaft 5 are stopped, thereby preventing the E-ring or the like from being pulled out at the tip of the rotating shaft 5. Even if a member is not mounted, the retaining is made. However, normally, both ends of the rotating shaft 5 are set so as not to contact the both hanging walls 23, 23.

従って、組立工数が減り、また部品点数も少なくなるので、コスト低減化に寄与するのである。しかも、前記回動軸５は、凸部５３Ａ，５３Ａを設けた非円柱部５３が非円孔５１に嵌合するので、ロッキングの際に前記背凭れ杆４に対して回動軸５が回転することがなく、前記座受体１０のボックス部２６に対してブッシュ５５，５５を軸受として回転するので、またブッシュ５５のフランジ部５６が、背凭れ杆４とボックス部２６の側面板５７との間でスペーサーとして機能するので、金属同士の擦れ音が発生することがなく、摩耗も少なくなり、回動動作が円滑である。また、前記通孔５４をバーリング加工で形成したので、内方に有する円筒部が前記ブッシュ５５にかかる荷重を分散することができ、該ブッシュ５５の耐久性が高くなる。尚、一方の前記背凭れ杆４の両管壁に同じ形状の非円孔５１，５１を形成したが、これは加工がし易いたためであり、図９及び図１０に示すように、内側の管壁に形成した非円孔５１は前記回動軸５の非円柱部５３が嵌合しないので、内側は円孔にしても良い。   Therefore, the number of assembly steps is reduced and the number of parts is reduced, which contributes to cost reduction. In addition, since the non-cylindrical portion 53 provided with the convex portions 53A and 53A is fitted in the non-circular hole 51, the rotation shaft 5 rotates with respect to the backrest 4 when locking. Therefore, the bushes 55 and 55 are rotated with respect to the box portion 26 of the seat receiver 10 as bearings, and the flange portion 56 of the bush 55 is connected to the backrest 4 and the side plate 57 of the box portion 26. Since it functions as a spacer in between, there is no noise between metals, wear is reduced, and the turning operation is smooth. In addition, since the through hole 54 is formed by burring, the inner cylindrical portion can disperse the load applied to the bush 55, and the durability of the bush 55 is enhanced. In addition, although the non-circular holes 51 and 51 of the same shape were formed in both the tube walls of one said backrest collar 4, this is because it was easy to process, and as shown in FIG.9 and FIG.10, as shown in FIG. Since the non-circular hole 51 formed in the tube wall does not fit the non-cylindrical portion 53 of the rotating shaft 5, the inner side may be a circular hole.

前述のように、前記座部２を構成する座受体１０に、背凭れ部３をロッキング可能に支持する背凭れ杆４，４の基部４２，４２を回動軸５にて枢着し、両背凭れ杆４，４の基部４２，４２に渡して固定した前記傾動板１１と前記座受体１０のボックス部２６の底面板５７とに、その間隔が接近する方向に前記弾性付勢手段１２にて、背凭れ部３の後傾に対して弾性付勢力を付与している。前記弾性付勢手段１２は、公知の構造であるが、図１２に示すように、前記傾動板１１と底面板５７に形成した開口部に調節螺軸５８を貫通させ、該調節螺軸５８の上端に固定した係止部材５９と前記底面板５７の間に圧縮コイルばね６０を介装し、前記傾動板１１を貫通した前記調節螺軸５８の下端部に調節ハンドル６１の内部に埋め込んだナット部材６２を螺合したものである。   As described above, the bases 42 and 42 of the backrests 4 and 4 that support the backrest 3 so as to be rockable are pivotally attached to the seat receiver 10 constituting the seat 2 by the rotation shaft 5. The elastic biasing means in a direction in which the distance between the tilting plate 11 and the bottom plate 57 of the box portion 26 of the seat receiver 10 approaches each other is fixed to the base portions 42 and 42 of the backrests 4 and 4. At 12, an elastic biasing force is applied to the back tilt of the backrest 3. The elastic biasing means 12 has a known structure, but as shown in FIG. 12, an adjustment screw shaft 58 is passed through openings formed in the tilting plate 11 and the bottom plate 57 so that the adjustment screw shaft 58 A compression coil spring 60 is interposed between the locking member 59 fixed to the upper end and the bottom plate 57, and a nut embedded in the adjustment handle 61 at the lower end of the adjustment screw 58 penetrating the tilting plate 11. The member 62 is screwed together.

前記背凭れ部３のロッキング動作時に、前記背凭れ杆４の基部４２が前記回動軸５を中心に上下に傾動する。このとき背凭れ杆４の可動部に指を挟む危険性があるので、図１〜図３、図１１〜図１４に示すように、前記背凭れ杆４，４の基部４２，４２を合成樹脂製の化粧カバー７で覆い、指が挿入される恐れのある空間を無くするのである。   During the locking operation of the backrest 3, the base 42 of the backrest 4 tilts up and down around the rotation shaft 5. At this time, since there is a risk that a finger may be caught in the movable part of the backrest 4, the bases 42, 42 of the backrest 4, 4 are made of synthetic resin as shown in FIGS. It is covered with the made-up decorative cover 7 to eliminate the space where the fingers may be inserted.

一般的に、可動部の指詰め防止処理における指針として、クリアランスを８ｍｍ以下、２５ｍｍ以上にすることが基本である。それが不可能であれば、指を挟んだとしても怪我をしないこと、痛くないことが要求される。本実施形態における椅子は、この指針に準拠した設計となっている。   Generally, as a guideline in the finger padding prevention process of the movable part, it is fundamental that the clearance is 8 mm or less and 25 mm or more. If this is not possible, it is required not to be injured or hurt even if a finger is caught. The chair in this embodiment is designed in accordance with this guideline.

前記化粧カバー７は、図１１に示すように、上方へ開放したボックス状となっており、両側に前記座アウター１３の両垂下壁２３，２３の内側に重なって位置する側面カバー片６３，６３を上向きに形成するとともに、前記座受体１０のボックス部２６から後方へ延びた前記背凭れ杆４，４の基部４２，４２から立上り部４３の下部にかけて包み込む外被部６４を有し、底面カバー部６５の前部には前記弾性付勢手段１２の調節ハンドル６１を受け入れる開口部６６が形成され、更に前記座受体１０のボックス部２６の後部に密接する隔壁部６７を前記底面カバー部６５に立設している。そして、図１３（ｂ）、図１４（ｂ）に示すロッキング状態になっても、前記化粧カバー７の側面カバー片６３，６３は、と前記座アウター１３の両垂下壁２３，２３に接近して内外に重なり、前記隔壁部６７は、前記座受体１０のボックス部２６の後部に接近若しくは密接した状態を維持し、それらの間に指がはまる隙間を塞いでいる。   As shown in FIG. 11, the decorative cover 7 has a box shape opened upward, and side cover pieces 63, 63 positioned on both sides of the hanging walls 23, 23 of the seat outer 13 on both sides. And a covering portion 64 that wraps from the base portions 42 and 42 of the backrests 4 and 4 extending rearward from the box portion 26 of the seat receiver 10 to the lower portion of the rising portion 43, and has a bottom surface. An opening 66 for receiving the adjustment handle 61 of the elastic urging means 12 is formed in the front part of the cover part 65, and a partition wall part 67 that is in close contact with the rear part of the box part 26 of the seat receiver 10 is formed on the bottom cover part. Standing at 65. And even if it will be in the locking state shown in FIG.13 (b) and FIG.14 (b), the side surface cover pieces 63 and 63 of the said decorative cover 7 will approach the both drooping walls 23 and 23 of the said seat outer 13 and. The partition wall 67 is kept close to or in close contact with the rear portion of the box portion 26 of the seat receiver 10 and closes a gap where a finger fits between them.

ここで、前記化粧カバー７を所定位置に取付ける構造を説明する。前記化粧カバー７には、前記隔壁部６７に平行に前記外被部６４に保持片６８を立設し、前記隔壁部６７の上端部両側に円弧状の接合部を有する係止部６９，６９を側方へ突設し、前記保持片６８にも上端部両側に円弧状の接合部を有する係止部７０，７０を突設し、更に前記外被部６４の後端に前記背アウター２１の下端内側に係止する突片７１を形成している。そして、前記化粧カバー７の突片７１を背アウター２１の下端内側に係止した状態で、本体部を持ち上げれば、前記隔壁部６７と保持片６８は、左右の背凭れ杆４，４の基部４２，４２の間に変形しながら挿入され、前記隔壁部６７の係止部６９，６９と保持片６８の係止部７０，７０が、それぞれ背凭れ杆４，４に内側上部に圧接状態で係止するのである。この状態では、前記側面カバー片６３，６３は、前記座アウター１３の両垂下壁２３，２３の内側に密接するようになる（図１２参照）。尚、前記背凭れ部３に無負荷の状態（図１３（ａ）、図１４（ａ）参照）では、前記背凭れ杆４，４の基部４２，４２と座アウター１３の間には、指を挟まない程度の十分な間隔が設けられている。また、前記係止部７０，７０は、前記取付体１０のボックス部２６の後端コーナー部から側部にかけて包み込むように丸く形成され、その間でも指が挟まれないようにしている。   Here, a structure for attaching the decorative cover 7 to a predetermined position will be described. In the decorative cover 7, holding pieces 68 are erected on the jacket portion 64 in parallel with the partition wall portion 67, and locking portions 69 and 69 having arcuate joint portions on both sides of the upper end portion of the partition wall portion 67. The holding piece 68 is also provided with locking portions 70, 70 having arcuate joints on both sides of the upper end portion, and the back outer 21 at the rear end of the jacket portion 64. A projecting piece 71 is formed to be engaged with the lower end inside. Then, when the main body is lifted in a state where the protruding piece 71 of the decorative cover 7 is locked to the inner bottom end of the back outer 21, the partition wall 67 and the holding piece 68 are connected to the left and right backrest ridges 4,4. Inserted while being deformed between the base portions 42, 42, the locking portions 69, 69 of the partition wall portion 67 and the locking portions 70, 70 of the holding piece 68 are in pressure contact with the backrest ridges 4, 4, respectively, on the inner upper side. It locks with. In this state, the side cover pieces 63 and 63 come into close contact with the inner sides of the both hanging walls 23 and 23 of the seat outer 13 (see FIG. 12). When the backrest 3 is unloaded (see FIGS. 13 (a) and 14 (a)), there is no finger between the bases 42 and 42 of the backrest 4 and 4 and the seat outer 13. Sufficient spacing is provided so as not to sandwich the gap. Moreover, the said latching | locking parts 70 and 70 are formed so that it may wrap from the rear-end corner part of the box part 26 of the said attachment body 10 to a side part, and it is trying not to pinch | interpose a finger | toe among them.

前記座アウター１３の垂下壁２３は、断面形状が下向きに先細のテーパー形状となっており、上下寸法が大きな垂下壁２３の成形時の抜き勾配となりばかりでなく、前記化粧カバー７の側面カバー片６３，６３を受け入れるためのガイド面ともなっている。前記背凭れ部３をロッキングする際に、前記垂下壁２３と側面カバー片６３は擦れるが、その摩擦抵抗を低減するために、前記側面カバー片６３の外面には、複数の縦リブ７２，…を突設している。このように、前記化粧カバー７によって、可動部における指を挟む可能性のある隙間を前記側面カバー片６３，６３と垂下壁２３とで完全に塞いでいるので非常に安全であるとともに、前記背凭れ杆４，４の基部４２，４２の側方、下方及び後方が、完全に隠蔽されるので外観性にも優れたものとなる。   The hanging wall 23 of the seat outer 13 has a tapered shape with a tapering downward in a cross-sectional shape, and not only becomes a draft when forming the hanging wall 23 having a large vertical dimension, but also a side cover piece of the decorative cover 7. It is also a guide surface for receiving 63,63. When the backrest 3 is locked, the hanging wall 23 and the side cover piece 63 are rubbed. In order to reduce the frictional resistance, a plurality of vertical ribs 72,. Is protruding. In this way, the decorative cover 7 completely closes the gap that may pinch the finger in the movable portion with the side cover pieces 63 and 63 and the hanging wall 23, so that it is very safe and the back Since the sides 42 and 42 of the bases 42 and 42 of the rounded ridges 4 and 4 are completely concealed, the appearance is excellent.

１ 脚部、 ２ 座部、
３ 背凭れ部、 ４ 背凭れ杆、
５ 回動軸、 ６ 操作レバー、
７ 化粧カバー、 ８ 脚柱、
９ ガスシリンダー、 １０ 座受体、
１１ 傾動板、 １２ 弾性付勢手段、
１３ 座アウター、 １４ 座クッション、
１５ 張地、 １６ 肘掛け、
１７ 肘補強金具、 １８ 背インナー、
１９ 背クッション、 ２０ 張地、
２１ 背アウター、 ２２ リブ、
２３ 垂下壁、 ２４ 連結壁、
２５ 取付孔、 ２６ ボックス部、
２７ 補強板、 ２８ 固定部、
２９ 作動ピン、 ３０ 固定ネジ、
３１ 爪付ナット、 ３２ 軸部、
３３ ハンドル部、 ３４ 作用部、
３５ レバーキャップ、 ３６ 軸受部、
３７ 開口、 ３８ 規制板、
３９ 嵌合部、 ４０ ネジ、
４１ 取付台、 ４２ 基部、
４３ 立上り部、 ４４ 取付板、
４５ 固定板、 ４６ 取付孔、
４７ 取付片、 ４８ 取付孔、
４９ ネジ、 ５０ 側面板、
５１ 非円孔、 ５２ 円孔、
５３ 非円柱部、 ５４ 通孔、
５５ ブッシュ、 ５６ フランジ部、
５７ 底面板、 ５８ 調節螺軸、
５９ 係止部材、 ６０ 圧縮コイルばね、
６１ 調節ハンドル、 ６２ ナット部材、
６３ 側面カバー片、 ６４ 外被部、
６５ 底面カバー部、 ６６ 開口部、
６７ 隔壁部、 ６８ 保持片、
６９ 係止部、 ７０ 係止部、
７１ 突片、 ７２ 縦リブ。 1 leg, 2 seat,
3 Backrest, 4 Backrest,
5 rotation axis, 6 operation lever,
7 makeup covers, 8 pedestals,
9 Gas cylinder, 10 Seat receiver,
11 tilting plate, 12 elastic biasing means,
13 seat outer, 14 seat cushion,
15 Zhangji, 16 Armrests,
17 elbow reinforcement, 18 back inner,
19 back cushion, 20 upholstery,
21 back outer, 22 ribs,
23 hanging wall, 24 connecting wall,
25 mounting holes, 26 box parts,
27 reinforcing plate, 28 fixing part,
29 operation pins, 30 fixing screws,
31 Nuts with claws, 32 Shaft,
33 handle part, 34 action part,
35 Lever cap, 36 Bearing part,
37 opening, 38 regulating plate,
39 fitting part, 40 screw,
41 mounting base, 42 base,
43 rising part, 44 mounting plate,
45 fixing plate, 46 mounting hole,
47 mounting pieces, 48 mounting holes,
49 screws, 50 side plates,
51 non-circular holes, 52 circular holes,
53 non-cylindrical part, 54 through-hole,
55 Bush, 56 Flange,
57 bottom plate, 58 adjusting screw shaft,
59 locking member, 60 compression coil spring,
61 adjustment handle, 62 nut member,
63 side cover piece, 64 outer cover part,
65 bottom cover, 66 opening,
67 partition wall, 68 holding piece,
69 locking part, 70 locking part,
71 projecting pieces, 72 vertical ribs.

Claims (4)

座部の座受体に背凭れ部を支持する背凭れ杆を枢着し、ロッキング可能となした椅子において、前記座部は、合成樹脂製の座アウターと該座アウターの下面に取付けた金属製の座受体を備え、前記座アウターの下面両側部に前後方向に延びた垂下壁を有するとともに、両垂下壁の間に前記座受体が位置した構造であり、左右一対の金属製の背凭れ杆を有し、一方の背凭れ杆の基部には非円孔を備え、他方の背凭れ杆の基部には円孔を備え、金属製の回動軸を前記座受体の両側面板に形成した通孔に貫通した状態で、該回動軸の一端部に形成した非円柱部を一方の前記背凭れ杆の非円孔に非回転となした嵌合状態とし、該回動軸の他端部を他方の前記背凭れ杆の円孔に挿入状態とし、両背凭れ杆から突出した前記回動軸の両端を前記両垂下壁の間に位置させてなることを特徴とする椅子の背凭れ枢着装置。 A chair in which a backrest for supporting the backrest is pivotally attached to a seat receiver of the seat and made rockable . The seat is made of a synthetic resin outer seat and a metal attached to the lower surface of the outer seat. comprising a manufacturing of the seat receptacle, which has a depending wall extending in the longitudinal direction on the lower surface sides of the seat outer, a structure in which the seat receptacle is located between the two downward wall, a pair of left and right metal It has a backrest lever, with a non-circular hole in the base of one of the backrest rod, with the other of the backrest rod circular hole in the base of both side plates of the seat receptacle metallic pivot shaft in a state penetrating the through hole formed, and a fitting state of no a non-rotating non-cylindrical portion formed at one end of the pivoting axis to a non-circular hole of one of the backrest rod, pivot shaft the backrest and the insertion state into the circular hole of the rod, both ends of the both hanging wall of the pivot shaft which projects from both backrest rod to the other end portion the other Backrest pivot device of the chair characterized by comprising by located. 前記回動軸の非円柱部は、金属丸棒の直径方向の両側に凸部を形成した形状であり、前記背凭れ杆の非円孔は、円孔の直径部に前記凸部を受け入れる凹部を形成した形状である請求項１記載の椅子の背凭れ枢着装置。 The non-cylindrical portion of the rotating shaft has a shape in which convex portions are formed on both sides in the diameter direction of the metal round bar, and the non-circular hole of the backrest ridge is a concave portion that receives the convex portion in the diameter portion of the circular hole. The backrest pivot attachment device for a chair according to claim 1, wherein the chair has a shape in which the shape is formed. 前記座受体の両側面板には、前記回動軸の直径よりも大きな直径の通孔を有し、該通孔には、外側にフランジ部を有する合成樹脂製のブッシュをそれぞれ嵌合状態で設け、前記回動軸は両ブッシュを貫通状態で回動可能に支持されている請求項１又は２記載の椅子の背凭れ枢着装置。 Both side plates of the seat receiver have through holes having a diameter larger than the diameter of the pivot shaft, and synthetic resin bushes having flange portions on the outside are fitted in the through holes, respectively . provided, wherein the pivot shaft is backrest pivot device according to claim 1 or 2, wherein the chair is rotatably supported both bushes in the through state. 前記座受体の両側面板に形成した通孔の周囲には、該側面板の内側に立ち上がった円筒部を一体的に有している請求項１〜３何れか１項に記載の椅子の背凭れ枢着装置。 Around the hole formed on both the side plates of the seat receptacle, the back of the chair according to claim 1 any one of integrally has a cylindrical portion that rises inside of the side plates Drown pivoting device.

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