JP6765281B2 - Backrest for chairs and chairs - Google Patents

Backrest for chairs and chairs Download PDF

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JP6765281B2
JP6765281B2 JP2016207283A JP2016207283A JP6765281B2 JP 6765281 B2 JP6765281 B2 JP 6765281B2 JP 2016207283 A JP2016207283 A JP 2016207283A JP 2016207283 A JP2016207283 A JP 2016207283A JP 6765281 B2 JP6765281 B2 JP 6765281B2
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backrest
diameter portion
locking
chair
large diameter
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JP2018064905A (en
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益永　浩
浩 益永
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Okamura Corp
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Description

本発明は、椅子用背凭れ、及び、それを備えた椅子に関するものである。 The present invention relates to a backrest for a chair and a chair provided with the backrest.

着座者の背部の荷重を支持する背凭れを備えた椅子がある。事務用等として用いられる椅子は、着座者の背中が接触する部分に柔軟性やフィット感を求められるとともに、大きな荷重を確実に受け止めることができる堅牢性も求められる。このような要望に対応するため、着座者の背中を通して入力される荷重を直接受ける背凭れ本体と、背凭れ本体を背部から支持する背凭れ支持部を別体部材によって構成した椅子が知られている（例えば、特許文献１参照）。 There is a chair with a backrest that supports the load on the back of the seated person. Chairs used for office work are required to have flexibility and fit in the part where the seated person's back contacts, and also to be robust enough to reliably receive a large load. In order to meet such demands, a chair is known in which a backrest body that directly receives a load input through the back of a seated person and a backrest support part that supports the backrest body from the back are made of separate members. (See, for example, Patent Document 1).

特許文献１に記載の椅子用背凭れは、背凭れ支持体の前側下端が、支持体である座の下方の支基に連結されるとともに、背凭れ支持体の後側上部の前面側に背凭れ本体が支持されている。背凭れ支持体の後側上部の前面には、先端部が前方に突出する凸軸が設けられており、背凭れ本体の背凭れ枠の後部には、凸軸の先端部が挿入されて連結される軸筒部材が埋設されている。筒軸部材は、凸軸の先端部が挿入されて連結された状態で背凭れ枠の嵌合孔内に固定されている。 In the chair backrest described in Patent Document 1, the lower end of the front side of the backrest support is connected to the lower support base of the seat which is the support, and the backrest is backed to the front side of the upper rear side of the backrest support. The leaning body is supported. A convex shaft whose tip protrudes forward is provided on the front surface of the upper rear side of the backrest support, and the tip of the convex shaft is inserted and connected to the rear part of the backrest frame of the backrest body. The shaft cylinder member to be inserted is embedded. The tubular shaft member is fixed in the fitting hole of the backrest frame in a state where the tip end portion of the convex shaft is inserted and connected.

筒軸部材には、凸軸の先端部が挿入される軸孔が形成され、軸孔の周壁と凸軸とは抜け止めピンによって抜け規制されている。また、凸軸には、抜け止めピンが嵌入される係止孔が形成されているが、その係止孔は、孔の軸方向の両側部分から中央部に向かってテーパ状に肉抜きされている。このため、凸軸は、筒軸部材に係止された抜け止めピンに対して傾動可能とされており、背凭れ本体は、この仕組みによって背凭れ支持体に対して若干の傾動を許容されている。 A shaft hole into which the tip of the convex shaft is inserted is formed in the tubular shaft member, and the peripheral wall of the shaft hole and the convex shaft are restricted from coming off by a retaining pin. Further, the convex shaft is formed with a locking hole into which a retaining pin is fitted, and the locking hole is tapered from both side portions in the axial direction of the hole toward the center. There is. For this reason, the convex shaft can be tilted with respect to the retaining pin locked to the tubular shaft member, and the backrest main body is allowed to slightly tilt with respect to the backrest support by this mechanism. There is.

特許第５５４３１１７号公報Japanese Patent No. 5543117

特許文献１に記載の椅子用背凭れは、背凭れ支持体に突設された凸軸が背凭れ枠の後部に嵌入された状態において、凸軸からの背凭れ枠（背凭れ本体）の抜けを抜け止めピンによって規制されている。この椅子用背凭れの場合、抜け止めピンによって背凭れ本体の抜けを規制できるようになるものの、背凭れ本体に荷重受け面に沿う方向の荷重が入力されたときに、抜け規制ピンの軸線方向と略直交する方向にせん断応力が作用することがある。このため、抜け規制ピンの強度を高める等して部材耐久性を高めるための対策が必要となる。 The backrest for a chair described in Patent Document 1 is a state in which a convex shaft projecting from a backrest support is fitted into the rear portion of the backrest frame, and the backrest frame (backrest main body) is pulled out from the convex shaft. Is regulated by a retaining pin. In the case of this backrest for chairs, the retaining pin can be used to regulate the pulling out of the backrest body, but when a load is input to the backrest body in the direction along the load receiving surface, the axial direction of the pull-out control pin Shear stress may act in a direction substantially orthogonal to. Therefore, it is necessary to take measures to improve the durability of the member by increasing the strength of the pull-out control pin.

そこで本発明は、背凭れ支持体からの背凭れ本体の抜けを規制でき、かつ、構成部材に大きなせん断応力が作用するのを抑制することができる椅子用背凭れ、及び、椅子を提供しようとするものである。 Therefore, the present invention has been made to provide a chair backrest and a chair that can regulate the pulling out of the backrest main body from the backrest support and suppress the action of a large shear stress on the constituent members. Is what you do.

本発明に係る椅子用背凭れは、上記課題を解決するために、以下の構成を採用した。
即ち、本発明に係る椅子用背凭れは、着座者の背中を通して入力される荷重を受ける背凭れ本体と、前記背凭れ本体に連結されて前記背凭れ本体を支持する背凭れ支持体と、を備え、前記背凭れ本体と前記背凭れ支持体のうちの一方の部材である第１部材には、係止用突部が設けられ、前記背凭れ本体と前記背凭れ支持体のうちの他方の部材である第２部材には、前記係止用突部が嵌入される凹部が設けられ、前記係止用突部は、第１大径部と、前記第1大径部に隣接して設けられ前記第１大径部よりも外径の小さい小径部と、前記小径部に隣接して設けられ前記小径部よりも外径の大きい第２大径部と、を有し、前記第２部材には、前記凹部の内側において、前記第１大径部と前記第２大径部の相互に対向する軸方向の端面に当接し、かつ前記小径部の外周面に対して径方向に弾性変位可能に当接する抜け規制部が支持され、前記抜け規制部は、前記第２部材と別体の部材によって構成されるとともに、前記第２部材に係止固定される係止固定部を有していることを特徴とする。 The chair backrest according to the present invention adopts the following configuration in order to solve the above problems.
That is, the backrest for a chair according to the present invention includes a backrest main body that receives a load input through the back of the seated person and a backrest support that is connected to the backrest main body and supports the backrest main body. The first member, which is one member of the backrest main body and the backrest support, is provided with a locking protrusion, and the other of the backrest main body and the backrest support. The second member, which is a member, is provided with a recess into which the locking protrusion is fitted, and the locking protrusion is provided adjacent to the first large diameter portion and the first large diameter portion. The second member has a small diameter portion having an outer diameter smaller than that of the first large diameter portion and a second large diameter portion provided adjacent to the small diameter portion and having an outer diameter larger than that of the small diameter portion. In the inside of the recess, the first large diameter portion and the second large diameter portion are in contact with the end faces in the axial direction facing each other, and are elastically displaced in the radial direction with respect to the outer peripheral surface of the small diameter portion. A pull-out restricting portion that comes into contact with each other is supported, and the pull-out restricting portion is composed of a member separate from the second member and has a locking fixing portion that is locked and fixed to the second member. and said that you are.

上記の構成により、第１部材の係止用突部が第２部材の凹部に嵌入された状態において、凹部の内側で、抜け規制部が係止用突部の第１大径部と第２大径部の相互に対向する軸方向の端面に当接することにより、係止用突部からの凹部の抜けを規制される。これにより、背凭れ支持体からの背凭れ本体の抜けが規制される。また、凹部の内側で、抜け規制部が係止用突部の小径部の外周面に径方向に弾性変位可能に当接することにより、第１部材と第２部材の間に係止用突部の突出方向と交差する方向の荷重が入力されたときに、抜け規制部が係止用突部の径方向に沿う方向に弾性変位し、その間に緩衝作用をもって入力荷重を受け止めるようになる。これにより、抜け規制部やその他の部材にせん断応力が作用しにくくなる。 With the above configuration, in a state where the locking protrusion of the first member is fitted into the recess of the second member, the removal restricting portion is inside the recess and the first large diameter portion and the second locking protrusion of the locking protrusion. By abutting on the end faces of the large diameter portions facing each other in the axial direction, the removal of the recess from the locking protrusion is restricted. As a result, the backrest main body is restricted from coming off from the backrest support. Further, inside the recess, the pull-out restricting portion abuts on the outer peripheral surface of the small diameter portion of the locking protrusion so as to be elastically displaceable in the radial direction, whereby the locking protrusion is between the first member and the second member. When a load in a direction intersecting the protruding direction of the is input, the pull-out restricting portion is elastically displaced in the direction along the radial direction of the locking protrusion, and the input load is received by a buffering action during that time. This makes it difficult for shear stress to act on the pull-out control section and other members.

この場合、抜け規制部が第２部材と別体の部材によって構成されているため、第１部材側の係止用突部を第２部材の凹部に嵌入した後に、凹部内に配置された係止用突部の小径部の位置を確認しつつ、抜け規制部を係止用突部に容易に、かつ、適切に係合させることができる。このため、この構成を採用することにより、椅子用背凭れの組立作業性をより高めることができる。 In this case, since the pull-out control portion is composed of a member separate from the second member, the locking protrusion on the first member side is fitted into the recess of the second member and then arranged in the recess. While confirming the position of the small diameter portion of the stopping protrusion, the pull-out regulating portion can be easily and appropriately engaged with the locking protrusion. Therefore, by adopting this configuration, the workability of assembling the backrest for a chair can be further improved.

前記抜け規制部は、前記係止固定部に連設され前記小径部の外周面に複数方向から弾接する弾性部材を備えた構成であっても良い。
この場合、係止固定部を手で保持しつつ、弾性部材を小径部に対して弾性変形させながら凹部に押し込むことで、抜け規制部を係止用突部に容易に係合させることができる。 The pull-out restricting portion may be configured to include an elastic member that is connected to the locking and fixing portion and is elastically contacted with the outer peripheral surface of the small diameter portion from a plurality of directions.
In this case, the retaining portion can be easily engaged with the locking protrusion by pushing the elastic member into the recess while elastically deforming the elastic member with respect to the small diameter portion while holding the locking fixing portion by hand. ..

前記弾性部材は係止爪から成り、前記係止爪は、前記第１大径部と前記第２大径部の相互に対向する端面の間の離間距離に略等しい略一定の板厚を有し、該板厚方向を前記係止用突部の突出方向と合致させて前記第１大径部の端面と前記第２大径部の端面とに当接するようにしても良い。
この場合、抜け規制部の係止爪の板厚が略一定に形成され、その係止爪が板厚方向を係止用突部の突出方向と合致させて、第１大径部の端面と第２大径部の端面とに当接するため、係止爪を第１大径部と第２大径部の端面間に容易に嵌入することができるうえ、係止爪の前記端面間に介在される部分の容積を大きくできることから、係止用突部の突出方向に沿って作用する荷重を有利に受け止めることができる。 The elastic member is composed of a locking claw, and the locking claw has a substantially constant plate thickness substantially equal to the separation distance between the first large-diameter portion and the second large-diameter portion facing each other. Then, the plate thickness direction may be matched with the protruding direction of the locking protrusion so that the end face of the first large diameter portion and the end face of the second large diameter portion come into contact with each other.
In this case, the plate thickness of the locking claw of the pull-out restricting portion is formed to be substantially constant, and the locking claw matches the plate thickness direction with the protruding direction of the locking protrusion to match the end surface of the first large diameter portion. Since it comes into contact with the end face of the second large diameter portion, the locking claw can be easily fitted between the end faces of the first large diameter portion and the second large diameter portion, and is interposed between the end faces of the locking claw. Since the volume of the portion to be formed can be increased, the load acting along the projecting direction of the locking protrusion can be advantageously received.

前記係止爪は、前記係止固定部から相互に略平行になるように一対延設され、各前記係止爪には、前記小径部の外周面に弾接する円弧面が設けられるようにしても良い。
この場合、一対の係止爪に形成された円弧面により、小径部の外周面に作用する多様な方向の荷重を、緩衝作用をもって受け止めることができる。 A pair of locking claws are extended from the locking fixing portion so as to be substantially parallel to each other, and each of the locking claws is provided with an arc surface that repels the outer peripheral surface of the small diameter portion. Is also good.
In this case, the arcuate surfaces formed on the pair of locking claws can receive loads in various directions acting on the outer peripheral surface of the small diameter portion with a buffering action.

本発明に係る椅子は、前記いずれかの椅子用背凭れを備えていることを特徴とする。 The chair according to the present invention is characterized by having a backrest for any of the above chairs.

本発明によれば、第２部材の凹部の内側で、第１部材側の係止用突部の第１大径部と第２大径部の相互に対向する軸方向の端面に抜け規制部が当接することにより、背凭れ支持体からの背凭れ本体の抜けを規制することができる。さらに、本願発明によれば、第２部材の凹部の内側で、第１部材側の抜け規制部が係止用突部の小径部の外周面に径方向に弾性変位可能に当接することにより、第１部材と第２部材の間に係止用突部の突出方向と交差する方向の荷重が入力されたときに、抜け規制部やその他の部材にせん断応力が作用するのを抑制することができる。 According to the present invention, inside the recess of the second member, a pull-out restricting portion is formed on the axially opposite end faces of the first large-diameter portion and the second large-diameter portion of the locking protrusion on the first member side. It is possible to prevent the backrest main body from coming off from the backrest support. Further, according to the present invention, the pull-out restricting portion on the first member side abuts on the outer peripheral surface of the small diameter portion of the locking protrusion so as to be elastically displaceable in the radial direction inside the recess of the second member. When a load in a direction intersecting the protruding direction of the locking protrusion is input between the first member and the second member, it is possible to suppress the action of shear stress on the pull-out restricting portion and other members. it can.

本発明の一実施形態に係る椅子を側方から見た斜視図である。It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from the side. 本発明の一実施形態に係る椅子を後方（背凭れ側）から見た斜視図である。It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from the rear (backrest side). 本発明の一実施形態に係る椅子を左下前方から見た斜視図である。It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from the lower left front. 本発明の一実施形態に係る椅子の背凭れの骨格部の一部を示す斜視図である。It is a perspective view which shows a part of the skeleton part of the backrest of a chair which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＶ部の拡大図である。It is an enlarged view of the V part of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＶＩ−ＶＩ線に沿う断面図である。It is sectional drawing which follows the VI-VI line of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の分解斜視図である。It is an exploded perspective view of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＶ部の分解斜視図である。It is an exploded perspective view of the V part of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＩＸ部の分解斜視図である。It is an exploded perspective view of the IX part of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＸ−Ｘ線に沿う断面図である。It is sectional drawing which follows the X-ray line of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＸＩ−ＸＩ線に沿う断面図である。It is sectional drawing along the XI-XI line of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention. 本発明の一実施形態に係る背凭れの骨格部の図４のＸＩＩ−ＸＩＩ線に沿う断面図である。It is sectional drawing which follows the XII-XII line of FIG. 4 of the skeleton part of the backrest which concerns on one Embodiment of this invention.

以下、本発明の一実施形態を図面に基づいて説明する。
図１は、実施形態に係る椅子１００を側方から見た斜視図である。図２は、椅子１００を後方（背凭れ側）から見た斜視図である。
以下の説明においては、説明の便宜上、座体４に正規姿勢で着座した着座者が前を向く方向を「前方」と称し、その反対方向を「後方」と称する。また、以下の説明における上下、左右の向きは、着座者が座体４に正規姿勢で着座したときの着座者を中心とした向きと合致する向きを意味するものとする。また、椅子１００の左右方向については、適宜、椅子幅方向と称する。なお、図中の適所には、前方を指す矢印ＦＲと、上方を指す矢印ＵＰと、左側方を指す矢印ＬＨが記されていている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the chair 100 according to the embodiment as viewed from the side. FIG. 2 is a perspective view of the chair 100 as viewed from the rear (backrest side).
In the following description, for convenience of explanation, the direction in which the seated person seated in the seat body 4 in the normal posture faces forward is referred to as "forward", and the opposite direction is referred to as "rear". Further, the up-down, left-right directions in the following description mean directions that match the directions centered on the seated person when the seated person sits on the seating body 4 in a normal posture. Further, the left-right direction of the chair 100 is appropriately referred to as a chair width direction. In addition, an arrow FR pointing forward, an arrow UP pointing upward, and an arrow LH pointing to the left side are written at appropriate positions in the figure.

図１，図２に示すように、椅子１００は、床面Ｆ上に設置される脚部１と、脚部１の上部に設置されるボックス状の支基２と、支基２の上部に取り付けられた座受部材３と、座受部材３の上部に前後方向に位置調整可能に支持された座体４と、支基２の両側部に枢支されて支基２内の不図示のリクライニング機構により傾動し得る側面視略Ｌ字状の背凭れ支持体７０と、背凭れ支持体７０の上部の前面側に取り付けられた背凭れ本体７１と、背凭れ支持体７０の下部側の前縁部に取り付けられ、着座者の肘先が載せ置かれる左右一対の肘掛け７４と、を備えている。背凭れ支持体７０と背凭れ本体７１とは、着座者の背部の荷重を支持する背凭れ７（椅子用背凭れ）を構成している。 As shown in FIGS. 1 and 2, the chair 100 is provided on the leg 1 installed on the floor surface F, the box-shaped support 2 installed on the upper part of the leg 1, and the upper part of the support 2. The attached seat support member 3, the seat body 4 supported on the upper part of the seat support member 3 so as to be adjustable in the front-rear direction, and the support base 2 pivotally supported on both sides of the support base 2 (not shown). A side view substantially L-shaped backrest support 70 that can be tilted by the reclining mechanism, a backrest main body 71 attached to the front side of the upper part of the backrest support 70, and the front of the lower side of the backrest support 70. It is provided with a pair of left and right armrests 74, which are attached to the edges and on which the elbow tips of the seated person are placed. The backrest support 70 and the backrest main body 71 constitute a backrest 7 (chair backrest) that supports the load on the back of the seated person.

脚部１は、キャスタ１１Ａ付きの多岐脚１１と、多岐脚１１の中央部より起立し昇降機構であるガススプリング（不図示）を内蔵する脚柱１２と、を有している。
脚柱１２の下部を構成する外筒１３は、多岐脚１１に回転不能に嵌合して支持されている。脚柱１２の上部を構成する内筒１４は、上端部に支基２を固定して支持するとともに、下部が外筒１３に水平方向で回転可能に支持されている。
支基２には、脚柱１２の昇降調整機構と背凭れ７のリクライニング機構が内蔵されている。 The leg portion 1 has a multi-leg 11 with casters 11A, and a pedestal 12 that stands up from the center of the multi-leg 11 and incorporates a gas spring (not shown) which is an elevating mechanism.
The outer cylinder 13 constituting the lower part of the pedestal 12 is non-rotatably fitted and supported by the multi-legged legs 11. The inner cylinder 14 constituting the upper portion of the pedestal 12 is supported by fixing the support base 2 to the upper end portion, and the lower portion is rotatably supported by the outer cylinder 13 in the horizontal direction.
The support base 2 has a built-in elevating adjustment mechanism for the pedestal 12 and a reclining mechanism for the backrest 7.

図３は、一部の部品を取り去った椅子１００を座体４の左下前方から見た図である。
図３に示すように、座受部材３は、左右両側の前部領域と後部領域とが前アーム６０ｆと後アーム６０ｒを介して支基２の上部に揺動可能に連結されている。前アーム６０ｆは、支基２の前端部から上方に向かって湾曲しつつ椅子幅方向外側に延出し、下端側が椅子幅方向に沿う軸線を中心として支基２の前部に回動可能に支持されている。後アーム６０ｒは、下端部が背凭れ支持体７０の後述する前向き腕部７２ｂに一体に結合され、前向き腕部７２ｂから上方に向かって湾曲しつつ椅子幅方向外側に延出している。背凭れ支持体７０の前向き腕部７２ｂの前端部は支基２内の後部寄りのリクライニング機構の軸に連結されている。このため、後アーム６０ｒは、リクライニング機構の操作に応じて椅子幅方向に沿う軸回りに傾動する。 FIG. 3 is a view of the chair 100 from which some parts have been removed as viewed from the lower left front of the seat body 4.
As shown in FIG. 3, in the seat receiving member 3, the front region and the rear region on both the left and right sides are swingably connected to the upper part of the support base 2 via the front arm 60f and the rear arm 60r. The front arm 60f extends outward in the chair width direction while curving upward from the front end portion of the support base 2, and the lower end side is rotatably supported by the front portion of the support base 2 about an axis along the chair width direction. Has been done. The lower end of the rear arm 60r is integrally connected to the forward-facing arm 72b of the backrest support 70, which will be described later, and extends outward in the chair width direction while being curved upward from the forward-facing arm 72b. The front end of the forward arm 72b of the backrest support 70 is connected to the axis of the reclining mechanism near the rear in the support base 2. Therefore, the rear arm 60r tilts around the axis along the chair width direction in response to the operation of the reclining mechanism.

座受部材３は、前アーム６０ｆと後アーム６０ｒの各上端部に回動可能に連結されている。したがって、座受部材３は、前アーム６０ｆ、後アーム６０ｒ、及び、支基２とともに平行リンク機構を構成し、背凭れ支持体７０の傾動動作に連動して前後方向に変位するようになっている。 The seat member 3 is rotatably connected to the upper ends of the front arm 60f and the rear arm 60r. Therefore, the seat receiving member 3 constitutes a parallel link mechanism together with the front arm 60f, the rear arm 60r, and the support base 2, and is displaced in the front-rear direction in conjunction with the tilting motion of the backrest support 70. There is.

座体４は、着座荷重を受け止める硬質樹脂製の座シェル４０（荷重支持部材）と、座シェル４０の上部に配置された不図示のクッション部材と、クッション部材と座シェル４０の上方と周域とを覆う表皮部材４１と、を備えている。 The seat body 4 includes a seat shell 40 (load support member) made of hard resin that receives a seating load, a cushion member (not shown) arranged above the seat shell 40, and an upper portion and a peripheral area of the cushion member and the seat shell 40. It is provided with a skin member 41 that covers the above.

背凭れ支持体７０は、その主要部がアルミニウム合金等の金属材料から成り、椅子幅方向に離間して配置された左右一対の主フレーム７２と、椅子幅方向に延出して主フレーム７２の上端部同士を連結する連結フレーム７３と、を備えている。左右の主フレーム７２は、側面視が略Ｌ字状に形成されており、座体４の後部下方位置から上方に起立する起立部７２ａと、起立部７２ａの下端から湾曲しつつ前方に延びる前向き腕部７２ｂと、を有している。前向き腕部７２ｂの前端部は、前述のように支基２に設けられたリクライニング機構の軸に結合されている。また、左右の主フレーム７２の起立部７２ａは、上方に向かうにつれて両者の離間幅が次第に広がるように椅子幅方向外側に傾斜している。
なお、本実施形態においては、主フレーム７２と連結フレーム７３のうちの一方が背凭れ支持体７０の第１フレームを構成し、主フレーム７２と連結フレーム７３のうちの他方が背凭れ支持体７０の第２フレームを構成している。 The main part of the backrest support 70 is made of a metal material such as an aluminum alloy, and a pair of left and right main frames 72 arranged apart from each other in the chair width direction and an upper end of the main frame 72 extending in the chair width direction. A connecting frame 73 for connecting the portions is provided. The left and right main frames 72 are formed in a substantially L-shape in side view, and have a standing portion 72a that stands upward from the rear lower position of the seat body 4 and a forward facing portion that extends forward while being curved from the lower end of the standing portion 72a. It has an arm portion 72b and. The front end of the forward arm 72b is coupled to the shaft of the reclining mechanism provided on the support 2 as described above. Further, the upright portions 72a of the left and right main frames 72 are inclined outward in the chair width direction so that the separation width between the two gradually increases toward the upper side.
In the present embodiment, one of the main frame 72 and the connecting frame 73 constitutes the first frame of the backrest support 70, and the other of the main frame 72 and the connecting frame 73 constitutes the backrest support 70. It constitutes the second frame of.

背凭れ本体７１は、樹脂製の背凭れ枠７５と、背凭れ枠７５に張設されて着座者の背中からの入力荷重を直接受ける張材７６と、を有している。背凭れ枠７５は、図２に示すように、左右の枠辺７５ｓの離間幅が下方に向かって次第に窄まり、かつ、左右の枠辺７５ｓの上端部同士が椅子幅方向に延出する上部側の枠辺７５ｕによって連結される逆三角形状の正面視形状に形成されている。背凭れ枠７５の左右の各枠辺７５ｓには、上部寄り領域から後方側に向かって突出する上部連結アーム６９ｕと、下部寄り領域から後方側に向かって突出する下部連結アーム６９ｌと、が延設されている。上部連結アーム６９ｕは、背凭れ支持体７０の上部領域に連結され、下部連結アーム６９ｌは、背凭れ支持体７０の下部領域に連結されている。 The backrest main body 71 has a resin backrest frame 75 and a tension member 76 that is stretched on the backrest frame 75 and directly receives an input load from the back of the seated person. As shown in FIG. 2, the backrest frame 75 is an upper portion in which the distance between the left and right frame sides 75s gradually narrows downward and the upper ends of the left and right frame sides 75s extend in the chair width direction. It is formed in an inverted triangular front view shape connected by a frame side 75u on the side. On each of the left and right frame sides 75s of the backrest frame 75, an upper connecting arm 69u projecting from the upper region toward the rear side and a lower connecting arm 69l projecting from the lower region toward the rear side extend. It is set up. The upper connecting arm 69u is connected to the upper region of the backrest support 70, and the lower connecting arm 69l is connected to the lower region of the backrest support 70.

図４は、背凭れ７の骨格部の一部（ほぼ右半分）を左前部上方側から見た図であり、図５は、図４のＶ部を拡大して示した図である。図６は、図４のＶＩ−ＶＩ線に沿う断面を示す図であり、図７は、背凭れ７の骨格部の一部を分解して右後部上方側から見た図である。また、図８は、背凭れ７の骨格部を一部分解した図４のＶ部の拡大図である。
これらの図に示すように、連結フレーム７３の左右両端部には、短軸円柱状のボス部１７がそれぞれ設けられている。左右の各ボス部１７は、椅子１００が組み立てられた状態において、その軸心が椅子幅方向を向くように形成されている。ボス部１７には、前方側に開口するように凹形状部１８が形成されている。凹形状部１８は、相互に対向する一対の側壁１８ａ，１８ｂを有している。側壁１８ａ，１８ｂは、ボス部１７の軸方向の一端側と他端側に配置されている。凹形状部１８の椅子幅方向外側に位置される側の側壁１８ａには、連結部材であるボルト１９の頭部１９ａが収容される凹状座２０と、凹状座２０の底部において側壁１８ａを椅子幅方向に貫通するねじ孔２１と、が形成されている。 FIG. 4 is a view of a part (almost the right half) of the skeleton portion of the backrest 7 as viewed from the upper side of the left front portion, and FIG. 5 is an enlarged view of the V portion of FIG. FIG. 6 is a view showing a cross section along the VI-VI line of FIG. 4, and FIG. 7 is a view of a part of the skeleton portion of the backrest 7 viewed from the upper right rear side. Further, FIG. 8 is an enlarged view of the V portion of FIG. 4 in which the skeleton portion of the backrest 7 is partially disassembled.
As shown in these figures, short-axis columnar boss portions 17 are provided at both left and right ends of the connecting frame 73, respectively. The left and right boss portions 17 are formed so that their axes face in the chair width direction when the chair 100 is assembled. The boss portion 17 is formed with a concave portion 18 so as to open to the front side. The concave portion 18 has a pair of side walls 18a and 18b facing each other. The side walls 18a and 18b are arranged on one end side and the other end side in the axial direction of the boss portion 17. The side wall 18a on the side of the concave portion 18 located outside in the chair width direction has a concave seat 20 in which the head 19a of the bolt 19 which is a connecting member is housed, and the side wall 18a at the bottom of the concave seat 20. A screw hole 21 penetrating in the direction is formed.

また、左右の主フレーム７２の起立部７２ａの各上端には、連結フレーム７３の左右の対応する凹形状部１８の内側に挿入されて配置される凸形状部２２が形成されている。凸形状部２２は、起立部７２ａの上端面の椅子幅方向外側寄り位置から上方に突出している。凸形状部２２は、凹形状部１８の一対の側壁１８ａ，１８ｂの離間幅よりも幅が狭く形成されており、幅方向が側壁１８ａ，１８ｂの内面に対向するように、一対の側壁１８ａ，１８ｂの間に配置されるようになっている。凸形状部２２は、実際には、幅方向の一端面を凹形状部１８の一方の側壁１８ａに当接させた状態で凹形状部１８内に配置され、その状態で凸形状部２２の幅方向の他端面と凹形状部１８の他方の側壁１８ｂとの間に所定幅の空間部Ｓ（図７，図８参照）が確保されるようになっている。また、凸形状部２２には、幅方向に貫通するねじ孔２３が形成されている。 Further, convex portions 22 are formed at the upper ends of the standing portions 72a of the left and right main frames 72 so as to be inserted and arranged inside the corresponding concave portions 18 on the left and right of the connecting frame 73. The convex portion 22 projects upward from a position closer to the outside in the chair width direction on the upper end surface of the upright portion 72a. The convex portion 22 is formed to have a width narrower than the separation width of the pair of side walls 18a and 18b of the concave portion 18, and the pair of side walls 18a, such that the width direction faces the inner surfaces of the side walls 18a and 18b. It is designed to be placed between 18b. The convex portion 22 is actually arranged in the concave portion 18 in a state where one end surface in the width direction is in contact with one side wall 18a of the concave portion 18, and the width of the convex portion 22 in that state. A space portion S (see FIGS. 7 and 8) having a predetermined width is secured between the other end surface in the direction and the other side wall 18b of the concave portion 18. Further, the convex portion 22 is formed with a screw hole 23 penetrating in the width direction.

また、背凭れ枠７５の上部に延設された上部連結アーム６９ｕの先端部には、主フレーム７２と連結フレーム７３の連結部に連結される所定幅の延出片２４が延設されている。延出片２４は、上部連結アーム６９ｕの先端部のうちの椅子幅方向内側に偏った位置に延設されている。延出片２４には、椅子幅方向に貫通する挿通孔２５が形成されている。延出片２４は、凹形状部１８の他方の側壁１８ｂと凸形状部２２の間の空間部Ｓに挿入される。 Further, at the tip of the upper connecting arm 69u extending above the backrest frame 75, an extension piece 24 having a predetermined width connected to the connecting portion between the main frame 72 and the connecting frame 73 is extended. .. The extension piece 24 is extended at a position biased inward in the chair width direction in the tip portion of the upper connecting arm 69u. The extension piece 24 is formed with an insertion hole 25 that penetrates in the width direction of the chair. The extending piece 24 is inserted into the space S between the other side wall 18b of the concave portion 18 and the convex portion 22.

連結フレーム７３の凹形状部１８と、主フレーム７２の凸形状部２２と、背凭れ枠７５の延出片２４とは、連結部材であるボルト１９によって連結されている。
ボルト１９は、前述した頭部１９ａと、軸方向の一端が頭部１９ａに連設された第１軸部１９ｂと、軸方向の一端が第１軸部１９ｂの軸方向の他端に連設された第２軸部１９ｃと、を有している。第１軸部１９ｂと第２軸部１９ｃは同軸に形成されており、第１軸部１９ｂは、第２軸部１９ｃよりも大径に形成されている。第１軸部１９ｂの外周面には、凹形状部１８の一方の側壁のねじ孔２１と、凸形状部２２のねじ孔２３とに跨って螺合される雄ねじが形成されている。これに対し、第２軸部１９ｃの外周面には雄ねじが形成されておらず、延出片２４の挿通孔２５に対して隙間を持って挿通されるようになっている。 The concave portion 18 of the connecting frame 73, the convex portion 22 of the main frame 72, and the extension piece 24 of the backrest frame 75 are connected by a bolt 19 which is a connecting member.
The bolt 19 is connected to the above-mentioned head 19a, a first shaft portion 19b having one end in the axial direction connected to the head 19a, and one end in the axial direction connected to the other end in the axial direction of the first shaft portion 19b. It has a second shaft portion 19c and the like. The first shaft portion 19b and the second shaft portion 19c are formed coaxially, and the first shaft portion 19b is formed to have a larger diameter than the second shaft portion 19c. On the outer peripheral surface of the first shaft portion 19b, a male screw is formed which is screwed across the screw hole 21 on one side wall of the concave shape portion 18 and the screw hole 23 of the convex shape portion 22. On the other hand, no male screw is formed on the outer peripheral surface of the second shaft portion 19c, and the second shaft portion 19c is inserted through the insertion hole 25 of the extension piece 24 with a gap.

背凭れ本体７１の上部は、背凭れ支持体７０の左右の各主フレーム７２と連結フレーム７３に対して以下のようにして組み付けられる。 The upper portion of the backrest main body 71 is assembled to the left and right main frames 72 and the connecting frame 73 of the backrest support 70 as follows.

最初に、連結フレーム７３の凹形状部１８の内側に左右の対応する主フレーム７２の凸形状部２２を挿入し、その状態で凹形状部１８の一方の側壁１８ａのねじ孔２１と、凸形状部２２のねじ孔２３にボルト１９の第１軸部１９ｂを螺合する。このとき、ボルト１９の第２軸部１９ｃがねじ孔２１，２３に先に挿入されて、その状態でボルト１９を締め込んでいくと、ボルト１９の第２軸部１９ｃの先端が凸形状部２２のねじ孔２３から突出する前に、第１軸部１９ｂの雄ねじ部分が凹形状部１８の一方の側壁１８ａと凸形状部２２とに跨って螺合される。これにより、一方の側壁１８ａと凸形状部２２の軸方向の相対位置が固定されるとともに、凹形状部１８の他方の側壁１８ｂと凸形状部２２の間に所定幅の空間部Ｓが確保される。 First, the convex portions 22 of the corresponding main frames 72 on the left and right are inserted inside the concave portions 18 of the connecting frame 73, and in that state, the screw holes 21 of one side wall 18a of the concave portions 18 and the convex shape. The first shaft portion 19b of the bolt 19 is screwed into the screw hole 23 of the portion 22. At this time, when the second shaft portion 19c of the bolt 19 is first inserted into the screw holes 21 and 23 and the bolt 19 is tightened in that state, the tip of the second shaft portion 19c of the bolt 19 is a convex portion. Before protruding from the screw hole 23 of 22, the male screw portion of the first shaft portion 19b is screwed across one side wall 18a of the concave shape portion 18 and the convex shape portion 22. As a result, the relative positions of one side wall 18a and the convex portion 22 in the axial direction are fixed, and a space portion S having a predetermined width is secured between the other side wall 18b of the concave portion 18 and the convex portion 22. To.

次に、背凭れ本体７１側の対応する延出片２４を、上記の凹形状部１８の他方の側壁１８ｂと凸形状部２２の間にできた空間部Ｓの内側に挿入する。この状態において、延出片２４の挿通孔２５を凸形状部２２のねじ孔２３と位置合わせし、ボルト１９の締め込みを再開する。こうして、ボルト１９が締め込まれると、ボルト１９の第２軸部１９ｃが凸形状部２２から次第に突出し、延出片２４の挿通孔２５に挿通されるようになる。こうしてボルト１９が完全に締め込まれると、背凭れ本体７１側の延出片２４がボルト１９の第２軸部１９ｃによって回動可能に保持される。この結果、背凭れ本体７１の上部は、背凭れ支持体７０の主フレーム７２と連結フレーム７３の連結部に組み付けられることになる。 Next, the corresponding extension piece 24 on the backrest main body 71 side is inserted inside the space portion S formed between the other side wall 18b of the concave shape portion 18 and the convex shape portion 22. In this state, the insertion hole 25 of the extension piece 24 is aligned with the screw hole 23 of the convex portion 22, and the tightening of the bolt 19 is restarted. In this way, when the bolt 19 is tightened, the second shaft portion 19c of the bolt 19 gradually protrudes from the convex portion 22 and is inserted into the insertion hole 25 of the extension piece 24. When the bolt 19 is completely tightened in this way, the extension piece 24 on the backrest main body 71 side is rotatably held by the second shaft portion 19c of the bolt 19. As a result, the upper portion of the backrest main body 71 is assembled to the connecting portion between the main frame 72 of the backrest support 70 and the connecting frame 73.

図９は、背凭れの骨格部を図４のＩＸ部に対応する部分を分解して左上部前方側から見た図であり、図１０は、図４のＸ−Ｘ線に沿う断面を示す図である。また、図１１は、図４のＸＩ−ＸＩ線に沿う断面を示す図であり、図１２は、図４のＸＩＩ−ＸＩＩ線に沿う断面を示す図である。
これらの図に示すように、下部連結アーム６９ｌが連結される左右の主フレーム７２（起立部７２ａ）の下部領域には、その前面から前方に膨出する略長方体状の係止ブロック２７が固定されている。係止ブロック２７には、その前面から前方に突出する嵌合ピン２８が締結固定されている。係止ブロック２７と嵌合ピン２８はアルミニウム合金等の金属材料によって形成されている。本実施形態においては、係止ブロック２７と嵌合ピン２８が係止用突部を構成している。 FIG. 9 is a view of the skeleton portion of the backrest as viewed from the front side of the upper left portion by disassembling the portion corresponding to the IX portion of FIG. 4, and FIG. 10 shows a cross section taken along the line XX of FIG. It is a figure. 11 is a diagram showing a cross section taken along the line XI-XI of FIG. 4, and FIG. 12 is a diagram showing a cross section taken along the line XII-XII of FIG.
As shown in these figures, in the lower region of the left and right main frames 72 (standing portions 72a) to which the lower connecting arms 69l are connected, a substantially rectangular parallelepiped locking block 27 that bulges forward from the front surface thereof. Is fixed. A fitting pin 28 projecting forward from the front surface of the locking block 27 is fastened and fixed to the locking block 27. The locking block 27 and the fitting pin 28 are made of a metal material such as an aluminum alloy. In the present embodiment, the locking block 27 and the fitting pin 28 form a locking protrusion.

嵌合ピン２８は、係止ブロック２７に形成されたねじ穴２７ａに締め込まれて固定されるねじ軸２９と、ねじ軸２９に連設され係止ブロック２７よりも前方に突出する係止用頭部３０と、を備えている。係止用頭部３０は、ねじ軸２９に同軸に連設されるとともにねじ軸２９よりも大径の第１大径部３０Ａと、第１大径部３０Ａに同軸に連設されるともに第１大径部３０Ａよりも小径の小径部３０Ｂと、小径部３０Ｂに同軸に連設されるとともに第１大径部３０Ａと同径の第２大径部３０Ｃと、を有している。小径部３０Ｂは、嵌合ピン２８の軸方向において、第１大径部３０Ａと第２大径部３０Ｃの間に配置されている。 The fitting pin 28 has a screw shaft 29 that is fastened and fixed in a screw hole 27a formed in the locking block 27, and a locking pin 28 that is connected to the screw shaft 29 and projects forward from the locking block 27. It has a head 30 and. The locking head 30 is coaxially connected to the screw shaft 29 and is coaxially connected to the first large diameter portion 30A having a diameter larger than that of the screw shaft 29 and the first large diameter portion 30A. It has a small diameter portion 30B having a diameter smaller than that of the large diameter portion 30A, and a second large diameter portion 30C which is coaxially connected to the small diameter portion 30B and has the same diameter as the first large diameter portion 30A. The small diameter portion 30B is arranged between the first large diameter portion 30A and the second large diameter portion 30C in the axial direction of the fitting pin 28.

これに対し、下部連結アーム６９ｌの先端面には、背凭れ支持体７０側の係止ブロック２７が嵌合される第１凹部３１と、嵌合ピン２８の係止用頭部３０が嵌合される第２凹部３２と、が連続して形成されている。第２凹部３２には、嵌合ピン２８の第１大径部３０Ａが嵌入される第１嵌入部３２ａと、嵌合ピン２８の第２大径部３０Ｃが嵌入される第２嵌入部３２ｃが同軸に形成されている。
本実施形態の場合、背凭れ支持体７０側の係止用突部が嵌入される凹部は、第１凹部３１と第２凹部３２とによって構成されている。 On the other hand, on the tip surface of the lower connecting arm 69l, the first recess 31 into which the locking block 27 on the backrest support 70 side is fitted and the locking head 30 of the fitting pin 28 are fitted. The second recess 32 to be formed is continuously formed. In the second recess 32, a first fitting portion 32a into which the first large diameter portion 30A of the fitting pin 28 is fitted and a second fitting portion 32c into which the second large diameter portion 30C of the fitting pin 28 is fitted are provided. It is formed coaxially.
In the case of the present embodiment, the recess into which the locking protrusion on the backrest support 70 side is fitted is composed of the first recess 31 and the second recess 32.

また、第２凹部３２の内部のうちの、第１嵌入部３２ａと第２嵌入部３２ｃの間の領域（嵌合ピン２８の小径部３０Ｂが挿入配置される領域）には、略矩形状の拡張空間３５が設けられている。拡張空間３５は、第２凹部３２に挿入された嵌合ピン２８の小径部３０Ｂと、第１大径部３０Ａと第２大径部３０Ｃの相互に対向する端面の周域とを取り囲むように形成されている。第２凹部３２には、拡張空間３５を下部連結アーム６９ｌの椅子幅方向内側の側面に開口する側方開口３６が連設されている。側方開口３６の周縁部には、段差状に窪んだ係止凹部３６ａが設けられている。 Further, in the region between the first fitting portion 32a and the second fitting portion 32c (the region where the small diameter portion 30B of the fitting pin 28 is inserted and arranged) in the inside of the second recess 32, a substantially rectangular shape is formed. An expansion space 35 is provided. The expansion space 35 surrounds the small diameter portion 30B of the fitting pin 28 inserted into the second recess 32 and the peripheral regions of the end faces of the first large diameter portion 30A and the second large diameter portion 30C that face each other. It is formed. In the second recess 32, a side opening 36 that opens the expansion space 35 on the inner side surface of the lower connecting arm 69l in the chair width direction is continuously provided. A locking recess 36a recessed in a stepped shape is provided on the peripheral edge of the side opening 36.

下部連結アーム６９ｌの側方開口３６には、第２凹部３２に嵌入された嵌合ピン２８の抜けを規制するための樹脂製の抜け規制部材５０（抜け規制部）が挿入されるようになっている。
抜け規制部材５０は、側方開口３６の周縁の係止凹部３６ａに嵌合状態で係止される遮蔽壁５１（係止固定部）と、遮蔽壁５１から略直交方向に延出する一対の係止爪５２Ａ，５２Ｂと、を有している。係止爪５２Ａ，５２Ｂは、嵌合ピン２８の第１大径部３０Ａと第２大径部３０Ｃの相互に対向する端面間の離間距離に略等しい一定厚みの板状に形成され、かつ、相互に略平行になるように近接して配置されている。係止爪５２Ａ，５２Ｂの相互に近接する側縁部には、嵌合ピン２８の小径部３０Ｂの外周面に弾接する円弧面５２Ａ−１，５２Ｂ−１が形成されている。なお、拡張空間３５の周壁は、拡張空間３５に挿入された係止爪５２Ａ，５２Ｂとの間に隙間が確保されるようになっている。 A resin-made pull-out regulating member 50 (pull-out regulating portion) for restricting the pull-out of the fitting pin 28 fitted in the second recess 32 is inserted into the side opening 36 of the lower connecting arm 69l. ing.
The pull-out control member 50 is a pair of a shielding wall 51 (locking fixing portion) that is locked in a locking recess 36a on the peripheral edge of the side opening 36 in a fitted state, and a pair that extends in a substantially orthogonal direction from the shielding wall 51. It has locking claws 52A and 52B. The locking claws 52A and 52B are formed in a plate shape having a constant thickness substantially equal to the separation distance between the end faces of the first large diameter portion 30A and the second large diameter portion 30C of the fitting pin 28 facing each other. They are arranged close to each other so as to be substantially parallel to each other. Arc surfaces 52A-1 and 52B-1 are formed on the side edges of the locking claws 52A and 52B that are close to each other and that are in contact with the outer peripheral surface of the small diameter portion 30B of the fitting pin 28. A gap is secured between the peripheral wall of the expansion space 35 and the locking claws 52A and 52B inserted in the expansion space 35.

抜け規制部材５０は、下部連結アーム６９ｌを主フレーム７２に組み付けるときに、以下のようにして嵌合ピン２８に係止される。
即ち、下部連結アーム６９ｌの組付け時には、下部連結アーム６９ｌの先端面の第１凹部３１と第２凹部３２に対して主フレーム７２側の対応する係止ブロック２７と嵌合ピン２８を嵌入する。このとき、嵌合ピン２８の第１大径部３０Ａと第２大径部３０Ｃは、それぞれ第２凹部３２内の第１嵌入部３２ａと第２嵌入部３２ｃに嵌入され、小径部３０Ｂは、第２凹部３２内の拡張空間３５内に配置される。 The pull-out restricting member 50 is locked to the fitting pin 28 as follows when the lower connecting arm 69l is assembled to the main frame 72.
That is, when assembling the lower connecting arm 69l, the corresponding locking block 27 and the fitting pin 28 on the main frame 72 side are fitted into the first recess 31 and the second recess 32 on the tip surface of the lower connecting arm 69l. .. At this time, the first large diameter portion 30A and the second large diameter portion 30C of the fitting pin 28 are fitted into the first fitting portion 32a and the second fitting portion 32c in the second recess 32, respectively, and the small diameter portion 30B is It is arranged in the expansion space 35 in the second recess 32.

次に、この状態から下部連結アーム６９ｌの側方開口３６から抜け規制部材５０の一対の係止爪５２Ａ，５２Ｂを拡張空間３５に挿入し、係止爪５２Ａ，５２Ｂの円弧面５２Ａ−１，５２Ｂ−１を小径部３０Ｂの外周面に弾接させるとともに、円弧面５２Ａ−１，５２Ｂ−１の縁部を、第１大径部３０Ａと第２大径部３０Ｃの相互に対向する端面に当接させる。これにより、第２凹部３２からの嵌合ピン２８の抜けが係止爪５２Ａ，５２Ｂによって規制される。抜け規制部材５０は、遮蔽壁５１が側方開口３６の係止凹部３６ａに嵌合されることにより、下部連結アーム６９ｌに係止固定される。
こうして抜け規制部材５０の係止爪５２Ａ，５２Ｂが嵌合ピン２８に係止されると、背凭れ本体７１が荷重受け面に沿う方向に変位する等して、下部連結アーム６９ｌが嵌合ピン２８に対して軸直交方向に変位することがあっても、係止爪５２Ａ，５２Ｂが小径部３０Ｂの外周面に当接して弾性変位することにより、入力荷重を緩衝しつつ受け止めることができる。 Next, from this state, a pair of locking claws 52A, 52B of the restricting member 50 are inserted into the expansion space 35 through the side opening 36 of the lower connecting arm 69l, and the arcuate surfaces 52A-1, 52B of the locking claws 52A, 52B. The 52B-1 is brought into contact with the outer peripheral surface of the small diameter portion 30B, and the edges of the arcuate surfaces 52A-1 and 52B-1 are attached to the end faces of the first large diameter portion 30A and the second large diameter portion 30C facing each other. Make a contact. As a result, the fitting pin 28 is restricted from coming off from the second recess 32 by the locking claws 52A and 52B. The pull-out restricting member 50 is locked and fixed to the lower connecting arm 69l by fitting the shielding wall 51 into the locking recess 36a of the side opening 36.
When the locking claws 52A and 52B of the pull-out restricting member 50 are locked to the fitting pin 28, the backrest main body 71 is displaced in the direction along the load receiving surface, and the lower connecting arm 69l is engaged with the fitting pin. Even if the locking claws 52A and 52B are displaced in the direction orthogonal to the axis with respect to 28, the locking claws 52A and 52B abut on the outer peripheral surface of the small diameter portion 30B and elastically displace, so that the input load can be received while being buffered.

以上のように、本実施形態に係る背凭れ７は、背凭れ支持体７０の主フレーム７２の前部に係止ブロック２７と嵌合ピン２８が突設され、背凭れ本体７１の下部連結アーム６９ｌに設けられた第１凹部３１と第２凹部３２とに、係止ブロック２７と嵌合ピン２８が嵌合されている。そして、嵌合ピン２８には、第１大径部３０Ａ及び第２大径部３０Ｃと、これらの間に設けられ第１大径部３０Ａ及び第２大径部３０Ｃよりも外径の小さい小径部３０Ｂと、が設けられており、下部連結アーム６９ｌに係止された抜け規制部材５０が、第２凹部３２の内側で、嵌合ピン２８の第１大径部３０Ａと第２大径部３０Ｃの相互に対向する端面に当接し、かつ小径部３０Ｂの外周面に弾性変位可能に当接している。
このため、本実施形態に係る背凭れ７は、抜け規制部材５０が第１大径部３０Ａと第２大径部３０Ｃの端面に当接することにより、背凭れ支持体７０の主フレーム７２からの下部連結アーム６９ｌの抜けを規制することができるうえ、抜け規制部材５０が小径部の外周面に弾性変位可能に当接するため、嵌合ピン２８の軸方向と交差する方向の荷重が入力されたときに、抜け規制部材５０がその荷重を、緩衝作用をもって受け止め、抜け規制部材５０やその他の部位にせん断応力が作用するのを抑制することができる。 As described above, in the backrest 7 according to the present embodiment, the locking block 27 and the fitting pin 28 are projected from the front portion of the main frame 72 of the backrest support 70, and the lower connecting arm of the backrest main body 71 is provided. The locking block 27 and the fitting pin 28 are fitted into the first recess 31 and the second recess 32 provided in 69l. The fitting pin 28 has a first large diameter portion 30A and a second large diameter portion 30C, and a small diameter provided between them and having an outer diameter smaller than that of the first large diameter portion 30A and the second large diameter portion 30C. The first large diameter portion 30A and the second large diameter portion of the fitting pin 28 are provided with the portion 30B and the pull-out restricting member 50 locked to the lower connecting arm 69l inside the second recess 32. It is in contact with the end faces of 30C facing each other and is in contact with the outer peripheral surface of the small diameter portion 30B so as to be elastically displaceable.
Therefore, in the backrest 7 according to the present embodiment, the pull-out restricting member 50 comes into contact with the end faces of the first large-diameter portion 30A and the second large-diameter portion 30C, so that the backrest support 70 comes from the main frame 72. In addition to being able to regulate the pulling out of the lower connecting arm 69l, the pulling out regulating member 50 abuts on the outer peripheral surface of the small diameter portion so that it can be elastically displaced, so that a load in a direction intersecting the axial direction of the fitting pin 28 is input. Occasionally, the pull-out restricting member 50 receives the load with a buffering action, and it is possible to suppress the action of shear stress on the pull-out regulating member 50 and other parts.

ところで、第２凹部３２の内側で、嵌合ピン２８と係合される抜け規制部は下部連結アーム６９ｌと一体に形成することも可能であるが、本発明に係る背凭れ７においては、下部連結アーム６９ｌと別体の抜け規制部材５０が設けられ、抜け規制部材５０の係止固定部を兼ねる遮蔽壁５１が下部連結アーム６９ｌの側方開口３６に係止されている。
このため、本実施形態に係る背凭れ７においては、下部連結アーム６９ｌの第２凹部３２に嵌合ピン２８を嵌合した後に、嵌合ピン２８の小径部３０Ｂの位置を、側方開口３６を通して目視確認しつつ、抜け規制部材５０の係止爪５２Ａ，５２Ｂを嵌合ピン２８に容易に、かつ、適切に係合させることができる。したがって、この構成を採用した場合には、背凭れ７をより効率組み付けることができる。 By the way, inside the second recess 32, the pull-out restricting portion engaged with the fitting pin 28 can be integrally formed with the lower connecting arm 69l, but in the backrest 7 according to the present invention, the lower portion is formed. A detachment regulating member 50 that is separate from the connecting arm 69l is provided, and a shielding wall 51 that also serves as a locking and fixing portion of the disconnecting regulating member 50 is locked to the side opening 36 of the lower connecting arm 69l.
Therefore, in the backrest 7 according to the present embodiment, after the fitting pin 28 is fitted into the second recess 32 of the lower connecting arm 69l, the position of the small diameter portion 30B of the fitting pin 28 is set to the side opening 36. The locking claws 52A and 52B of the pull-out restricting member 50 can be easily and appropriately engaged with the fitting pin 28 while visually checking through the fitting pin 28. Therefore, when this configuration is adopted, the backrest 7 can be assembled more efficiently.

また、本実施形態に係る背凭れ７においては、抜け規制部材５０が、係止固定部である遮蔽壁５１に連設され、嵌合ピン２８の小径部３０Ｂの外周面に複数方向から弾接する弾性部材である係止爪５２Ａ，５２Ｂを備えている。このため、遮蔽壁５１を手で保持しつつ、第２凹部３２内の小径部３０Ｂに対して係止爪５２Ａ，５２Ｂを弾性変形させながら押し込むことで、抜け規制部材５０を嵌合ピン２８に容易に係合させることができる。 Further, in the backrest 7 according to the present embodiment, the pull-out restricting member 50 is continuously provided on the shielding wall 51 which is the locking fixing portion, and elastically contacts the outer peripheral surface of the small diameter portion 30B of the fitting pin 28 from a plurality of directions. It is provided with locking claws 52A and 52B which are elastic members. Therefore, while holding the shielding wall 51 by hand, the locking claws 52A and 52B are pushed into the small diameter portion 30B in the second recess 32 while being elastically deformed, so that the pull-out regulating member 50 is pushed into the fitting pin 28. Can be easily engaged.

特に、本実施形態に係る背凭れ７では、抜け規制部材５０の係止爪５２Ａ，５２Ｂが、嵌合ピン２８の第１大径部３０Ａと第２大径部３０Ｃの離間距離に等しい略一定の板厚に形成され、その板厚方向を嵌合ピン２８の軸方向に合致させて、第１大径部３０Ａと第２大径部３０Ｃの各端面に当接させるようになっている。このため、係止爪５２Ａ，５２Ｂを第１大径部３０Ａと第２大径部３０Ｃの端面間に容易に嵌入することができ、しかも、係止爪５２Ａ，５２Ｂのうちの第１大径部３０Ａと第２大径部３０Ｃの端面間に介在される部分の容積を大きく確保できることから、嵌合ピン２８の軸方向に沿って作用する荷重（背凭れの抜け方向の荷重）を有利に受け止めることができる。 In particular, in the backrest 7 according to the present embodiment, the locking claws 52A and 52B of the pull-out restricting member 50 are substantially constant equal to the separation distance between the first large diameter portion 30A and the second large diameter portion 30C of the fitting pin 28. The plate thickness of the first large diameter portion 30A and the second large diameter portion 30C are brought into contact with each other by matching the plate thickness direction with the axial direction of the fitting pin 28. Therefore, the locking claws 52A and 52B can be easily fitted between the end faces of the first large diameter portion 30A and the second large diameter portion 30C, and the first large diameter of the locking claws 52A and 52B. Since a large volume of the portion interposed between the end faces of the portion 30A and the second large diameter portion 30C can be secured, the load acting along the axial direction of the fitting pin 28 (the load in the backrest pulling direction) is advantageous. I can take it.

さらに、本実施形態に係る背凭れ７の場合、抜け規制部材５０の遮蔽壁５１から相互に略平行になるように突設された一対の係止爪５２Ａ，５２Ｂに、嵌合ピン２８の小径部３０Ｂの外周面に弾接する円弧面５２Ａ−１，５２Ｂ−１が設けられているため、円弧面５２Ａ−１，５２Ｂ−１を通して小径部３０Ｂの外周面に作用する多様な方向の荷重を、緩衝作用をもって受け止めることができる。 Further, in the case of the backrest 7 according to the present embodiment, the small diameter of the fitting pin 28 is provided to the pair of locking claws 52A and 52B projecting from the shielding wall 51 of the pull-out restricting member 50 so as to be substantially parallel to each other. Since the arcuate surfaces 52A-1 and 52B-1 which are in contact with the outer peripheral surface of the portion 30B are provided, loads in various directions acting on the outer peripheral surface of the small diameter portion 30B through the arcuate surfaces 52A-1 and 52B-1 can be applied. It can be received with a buffering action.

なお、本発明は上記の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば、上記の実施形態においては、係止用突部が背凭れ支持体７０側に突設され、係止用突部に嵌入される凹部が背凭れ本体７１側に設けられているが、逆に、係止用突部を背凭れ本体７１側に突設し、凹部を背凭れ支持体７０側に設けるようにしても良い。また、上記の実施形態においては、係止用突部の一部（嵌合ピン２８）が別体部材として構成されているが、係止用突部全体を背凭れ支持体７０や背凭れ本体７１に一体に形成するようにしても良い。
また、上記の実施形態においては、背凭れ本体７５に張材７６が張設されて背凭れ本体７１が構成されているが、背凭れ本体は、背凭れシェルの前面にクッション材を配置し、クッション材と背凭れシェルの周域を表皮部材で覆った構成であっても良い。 The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof. For example, in the above embodiment, the locking protrusion is provided on the backrest support 70 side, and the recess to be fitted into the locking protrusion is provided on the backrest main body 71 side. In addition, the locking protrusion may be provided on the backrest main body 71 side, and the recess may be provided on the backrest support 70 side. Further, in the above embodiment, a part of the locking protrusion (fitting pin 28) is configured as a separate member, but the entire locking protrusion is covered by the backrest support 70 or the backrest main body. It may be formed integrally with 71.
Further, in the above embodiment, the upholstery material 76 is stretched on the backrest main body 75 to form the backrest main body 71, but in the backrest main body, a cushion material is arranged on the front surface of the backrest shell. The circumference of the cushion material and the backrest shell may be covered with a skin member.

７ 背凭れ
２７ 係止ブロック（係止用凸部）
２８ 嵌合ピン（係止用凸部）
３０Ａ 第１大径部
３０Ｂ 小径部
３０Ｃ 第２大径部
３１ 第１凹部（凹部）
３２ 第２凹部（凹部）
５０ 抜け規制部材（抜け規制部）
５１ 遮蔽壁（係止固定部）
５２Ａ，５２Ｂ 係止爪（弾性部材）
５２Ａ−１，５２Ｂ−１ 円弧面
７０ 背凭れ支持体
７１ 背凭れ本体 7 Backrest 27 Locking block (convex part for locking)
28 Fitting pin (convex part for locking)
30A 1st large diameter part 30B Small diameter part 30C 2nd large diameter part 31 1st recess (recess)
32 Second recess (recess)
50 Missing control member (missing control part)
51 Shielding wall (locking fixing part)
52A, 52B Locking claw (elastic member)
52A-1, 52B-1 Arc surface 70 Backrest support 71 Backrest body

Claims (5)

着座者の背中を通して入力される荷重を受ける背凭れ本体と、
前記背凭れ本体に連結されて前記背凭れ本体を支持する背凭れ支持体と、を備え、
前記背凭れ本体と前記背凭れ支持体のうちの一方の部材である第１部材には、係止用突部が設けられ、
前記背凭れ本体と前記背凭れ支持体のうちの他方の部材である第２部材には、前記係止用突部が嵌入される凹部が設けられ、
前記係止用突部は、
第１大径部と、
前記第1大径部に隣接して設けられ前記第１大径部よりも外径の小さい小径部と、
前記小径部に隣接して設けられ前記小径部よりも外径の大きい第２大径部と、を有し、
前記第２部材には、前記凹部の内側において、前記第１大径部と前記第２大径部の相互に対向する軸方向の端面に当接し、かつ前記小径部の外周面に対して径方向に弾性変位可能に当接する抜け規制部が支持され、
前記抜け規制部は、前記第２部材と別体の部材によって構成されるとともに、前記第２部材に係止固定される係止固定部を有していることを特徴とする椅子用背凭れ。 The backrest body that receives the load input through the back of the seated person,
A backrest support that is connected to the backrest main body and supports the backrest main body is provided.
A locking protrusion is provided on the first member, which is one of the backrest main body and the backrest support.
The second member, which is the other member of the backrest main body and the backrest support, is provided with a recess into which the locking protrusion is fitted.
The locking protrusion is
1st large diameter part and
A small diameter portion provided adjacent to the first large diameter portion and having an outer diameter smaller than that of the first large diameter portion,
It has a second large diameter portion that is provided adjacent to the small diameter portion and has an outer diameter larger than that of the small diameter portion.
Inside the recess, the second member abuts on the axially opposite end faces of the first large diameter portion and the second large diameter portion, and has a diameter with respect to the outer peripheral surface of the small diameter portion. The pull-out control part that comes into contact with elastic displacement in the direction is supported ,
The backrest for a chair is characterized in that the pull-out regulating portion is composed of a member separate from the second member and has a locking fixing portion that is locked and fixed to the second member . 前記抜け規制部は、前記係止固定部に連設され前記小径部の外周面に複数方向から弾接する弾性部材を備えていることを特徴とする請求項１に記載の椅子用背凭れ。 The backrest for a chair according to claim 1 , wherein the pull-out restricting portion is provided with an elastic member that is connected to the locking and fixing portion and is elastically contacted with the outer peripheral surface of the small-diameter portion from a plurality of directions. 前記弾性部材は係止爪から成り、
前記係止爪は、前記第１大径部と前記第２大径部の相互に対向する端面の間の離間距離に略等しい略一定の板厚を有し、該板厚方向を前記係止用突部の突出方向と合致させて前記第１大径部の端面と前記第２大径部の端面とに当接することを特徴とする請求項２に記載の椅子用背凭れ。 The elastic member consists of a locking claw.
The locking claw has a substantially constant plate thickness substantially equal to the separation distance between the first large-diameter portion and the second large-diameter portion facing each other, and locks in the plate thickness direction. The backrest for a chair according to claim 2 , wherein the end surface of the first large-diameter portion and the end surface of the second large-diameter portion are brought into contact with each other in accordance with the protruding direction of the protrusion. 前記係止爪は、前記係止固定部から相互に略平行になるように一対延設され、
各前記係止爪には、前記小径部の外周面に弾接する円弧面が設けられていることを特徴とする請求項３に記載の椅子用背凭れ。 A pair of locking claws are extended from the locking fixing portion so as to be substantially parallel to each other.
The backrest for a chair according to claim 3 , wherein each of the locking claws is provided with an arc surface that comes into contact with the outer peripheral surface of the small diameter portion. 請求項１〜４のいずれか１項に記載の椅子用背凭れを備えていることを特徴とする椅子。 A chair comprising the chair backrest according to any one of claims 1 to 4 .
JP2016207283A 2016-10-21 2016-10-21 Backrest for chairs and chairs Active JP6765281B2 (en)

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* Cited by examiner, † Cited by third party
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JP5452904B2 (en) * 2008-10-16 2014-03-26 株式会社岡村製作所 Chair
JP5543117B2 (en) * 2009-02-25 2014-07-09 株式会社岡村製作所 Chair backrest device
JP5479801B2 (en) * 2009-07-24 2014-04-23 株式会社岡村製作所 Back support structure
JP6041479B2 (en) * 2011-11-16 2016-12-07 株式会社イトーキ Chair back and method of manufacturing the same
US20160135603A1 (en) * 2013-06-06 2016-05-19 Itoki Corporation Chair

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