JP2023136640A

JP2023136640A - Chair

Info

Publication number: JP2023136640A
Application number: JP2022042425A
Authority: JP
Inventors: 典明長坂; Noriaki NAGASAKA; 未弦長谷田; Mitsuru HASEDA
Original assignee: Quali Co Ltd
Current assignee: Quali Co Ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2023-09-29

Abstract

To provide a chair which, while having a function of weight sensing type, possesses design flexibility and which can maintain a proper state as far as possible for the seating posture of a sitting person when the backrest is leaned backward.SOLUTION: A chair is equipped with a seat part elevation mechanism in which a seat part 2 vertically moves in accordance with the tilting of a backrest 4. The seat part elevation mechanism is composed of: a movable arm 8 which extends the seat part forward from the lower end of a backrest support part 5 to make it situated inside a pedestal 3; a fixed shaft 80 which is installed near the rear end of the pedestal and which makes the movable arm journaled in a tiltable manner for a support base 6 in synchronization with the tiltable movement of a backrest support part; a movable shaft 81 which is situated forward from the fixed shaft in the pedestal and which makes a seat support vertically movably journaled for the support base with the tilting of the movable arm; a vertical elevation-long hole 40 which is formed in the support base and which vertically moves the movable shaft; a horizontally long first slidable long hole 53 which is formed in the seat support and which makes the fixed shaft laterally slide; and a horizontally long second slidable long hole 54 which is formed in the seat support so as to intersect the elevation long hole and which makes the movable shaft laterally slide.SELECTED DRAWING: Figure 6

Description

本発明は、背もたれの傾倒に応じて座部が上下動するようにした座部昇降機構を備えた椅子である。 The present invention is a chair equipped with a seat lifting mechanism that allows the seat to move up and down in accordance with the tilting of the backrest.

着座者が背凭れに凭れ掛かると背凭れが後傾するいわゆるロッキング機能を備えた椅子において、さらにこれを発展させた体重感知式と呼ばれるものが存在している。すなわち、着座者が背凭れに凭れ掛かった際に、その背凭れに掛かった体重を利用して座部を昇降させるタイプの椅子である。このような体重感知式の椅子は、背凭れの後傾に追随するように座部が昇降するため、背凭れが後傾するのみの一般的なロッキング椅子に比べて、背凭れの傾斜フィーリングが着座者の身体の違い（体重の軽重）に関係なく同様に感じられるという効果が得られる。 Chairs with a so-called rocking function, in which the backrest tilts backwards when the seated person leans against the backrest, are further developed into a chair called a weight-sensing type. That is, this type of chair uses the weight of the seated person on the backrest to raise and lower the seat when the person is leaning against the backrest. In weight-sensing chairs like this, the seat moves up and down to follow the backward tilt of the backrest, so the feeling of the backrest tilting is greater than that of a typical rocking chair, where the backrest only tilts backwards. The effect is that the seater feels the same way regardless of the physical difference (lighter or heavier) of the person sitting on the seat.

そして、体重感知式のロッキング椅子の一般的なものとして、例えば、特許文献１に示されているようなものがあり、この椅子では、背凭れ支持杆９の補強部材１２の下端部を第１の枢軸８によって支基６に枢着すると共に、背凭れ支持杆９の補強部材１２の上端部を第４の枢軸３３によって座支持部材３１後部に枢着し、背凭れを後傾させると、第１の枢軸８を中心として座支持部材３１が後上方に回動し、ひいては、座支持部材３１に支持されている座７も後上方に移動するよう構成されている。 As a general weight-sensing type rocking chair, for example, there is a chair as shown in Patent Document 1, in which the lower end of the reinforcing member 12 of the backrest support rod 9 is connected to the first At the same time, the upper end of the reinforcing member 12 of the backrest support rod 9 is pivotally connected to the rear part of the seat support member 31 by the fourth pivot 33, and when the backrest is tilted backward, The seat support member 31 rotates rearward and upward about the first pivot 8, and the seat 7 supported by the seat support member 31 also moves rearward and upward.

特開２０１３－１５３８６８号公報Japanese Patent Application Publication No. 2013-153868

ここで、特許文献１に示された体重感知式の椅子においては、座支持体３１を昇降させるために背凭れ支持扞９の補強部材１２を回動させる必要があるわけだが、そうすると、支基６内に、少なくとも第１の枢軸８と第４の枢軸３３を半径とする円弧状に補強部材１２を移動させるスペースを確保しなければならなくなり、どうしても支基６を含めた種々の点で設計上の制約を受けることになってしまう。また、補強部材２の回動のみによって座支持体３１を昇降させるとするならば、単に補強部材２の回動範囲でしか座７の位置を調整し得ないので、背凭れを後傾した際の着座者の着座姿勢をより適正な状態に保持するにあたり限界が生じる。 Here, in the weight-sensing chair shown in Patent Document 1, it is necessary to rotate the reinforcing member 12 of the backrest support 9 in order to raise and lower the seat support 31. 6, it is necessary to secure a space for moving the reinforcing member 12 in an arc shape with at least the first pivot 8 and the fourth pivot 33 as radii. You will be subject to the above restrictions. Furthermore, if the seat support 31 is raised and lowered only by the rotation of the reinforcing member 2, the position of the seat 7 can only be adjusted within the rotational range of the reinforcing member 2. There are limits to maintaining the sitting posture of a person seated in a more appropriate state.

そこで、本発明は、上記課題を解決すべく、体重感知式という機能を備えつつ、設計上の自由度を有し、且つ背凭れを後傾した際の着座者の着座姿勢を可能な限り適正な状態に保持し得る椅子を提供することを目的としている。 Therefore, in order to solve the above problems, the present invention has a weight sensing function, has a degree of freedom in design, and makes the sitting posture of the seated person as appropriate as possible when the backrest is tilted backwards. The purpose is to provide a chair that can be maintained in a stable condition.

前記課題を解決するために本発明は、脚部と、前記脚部の上方に配置される座部と、前記脚部と前記座部との間に位置し前記脚部に前記座部を支持するための受台部と、前記受台部に接続され背凭れを支持する背凭れ支持部と、前記背もたれの傾倒に応じて前記座部が上下動するようにした座部昇降機構とからなる椅子において、前記受台部は、前記脚部の上方に固着される支持ベースと、前記座部の下方に固着される座受とを備え、前記座部昇降機構は、前記背凭れ支持部の下端から前方に延出し前記受台部内に位置させる可動アームと、前記受台部の後端よりに設けられ前記背凭れ支持部の傾動に同調して前記支持ベースに対し前記可動アームを傾動可能に軸支する固定軸と、前記受台部における前記固定軸よりも前方に位置し前記可動アームの傾動に伴い前記支持ベースに対し前記座受を上下方向へ移動可能に軸支する可動軸と、前記支持ベースに形成され前記可動軸を上下に移動させる縦長の昇降長孔と、前記座受に形成され前記固定軸を横方向へ摺動させる横長の第１摺動長孔と、前記座受において前記昇降長孔と交差するように形成され前記可動軸を横方向へ摺動させる横長の第２摺動長孔と、前記受台部の前記可動軸よりも前方位置に設けられ前記座受の前端部を前記可動軸が移動する頂部よりも上方へ移動させる昇降手段とからなることを特徴としている。 In order to solve the above problems, the present invention provides a leg section, a seat section disposed above the leg section, and a seat section located between the leg section and the seat section that supports the seat section on the leg section. A backrest support part that is connected to the pedestal part and supports the backrest, and a seat lifting mechanism that allows the seat part to move up and down in accordance with the tilting of the backrest. In the chair, the pedestal portion includes a support base fixed above the leg portion and a seat support fixed below the seat portion, and the seat lifting mechanism includes a support base fixed above the leg portion, and a seat support fixed below the seat portion. a movable arm extending forward from a lower end and positioned within the pedestal; and a movable arm provided at a rear end of the pedestal so as to be able to tilt the movable arm with respect to the support base in synchronization with the tilting of the backrest support. a movable shaft located in front of the fixed shaft in the pedestal portion and pivotally supporting the seat support so that it can move vertically with respect to the support base as the movable arm tilts; , a vertically elongated elongated elongated hole formed in the support base for moving the movable shaft up and down; a first horizontally elongated sliding elongate hole formed in the seat support for sliding the fixed shaft in the horizontal direction; a second horizontally long sliding hole formed in the holder to intersect with the elevating elongated hole and allowing the movable shaft to slide laterally; It is characterized by comprising an elevating means for moving the front end of the receiver above the top where the movable shaft moves.

また、本発明に係る椅子において、前記昇降手段を前記支持ベースと前記座受とに軸支されたリンク部材とすることが可能である。 Further, in the chair according to the present invention, the elevating means may be a link member pivotally supported by the support base and the seat support.

また、本発明に係る椅子において、前記昇降手段を前記支持ベース又は前記座受のいずれかに形成された昇降長孔と、前記昇降長孔に枢支され該昇降長孔を移動する移動軸とによって形成することが可能である。 Further, in the chair according to the present invention, the elevating means may include an elevating elongated hole formed in either the support base or the seat support, and a moving shaft that is pivotally supported by the elevating elongated hole and moves through the elevating elongated hole. It can be formed by

本発明は、受台を構成する支持ベースに縦長の昇降長孔を設け、この昇降長孔に可動アームに枢支された可動軸を上下動させることで、座受を昇降させることができるため、当該部位の省スペース化を図ることができると共に、受台の設計の自由度を向上させることができる。 The present invention provides a vertical elongated elongated hole in the support base constituting the pedestal, and by vertically moving a movable shaft pivotally supported by a movable arm in this elongated elevating hole, the seat support can be raised and lowered. , it is possible to save space in this part, and it is also possible to improve the degree of freedom in designing the pedestal.

また、本発明は、座受に固定軸を横方向へ摺動させる横長の第１摺動長孔と、可動軸を横方向へ摺動させる第２摺動長孔を設けており、このうち第２摺動長孔は支持ベースの昇降長孔と交差していることから、座受は昇降すると同時に横方向へ移動することになる。従って、背凭れを後傾した際の着座者の着座姿勢を可能な限り適正な状態に保持することができる。すなわち、仮に座受によって座部を上動のみさせると、後傾した背凭れに対して着座者の背中が密着した適正な姿勢を取り得ない場合も起こり得るが、本発明によれば、座受によって座部が横方向にも移動するため、後傾した背凭れに対して着座者の背中が密着するように調整することが可能である。特に、椅子によって、座部や背もたれの形状や取付角度等が異なるが、本発明は、こうした種々の事情に応じて、昇降長孔、第１摺動長孔、第２摺動長孔の寸法、位置、傾き等を変化させることができるといった設計上の微調整も容易になし得る。 Further, in the present invention, the seat support is provided with a horizontally long first sliding slot for sliding the fixed shaft in the horizontal direction and a second sliding slot for sliding the movable shaft in the horizontal direction. Since the second sliding elongated hole intersects with the elevating elongated hole of the support base, the seat support moves laterally at the same time as it rises and lowers. Therefore, the sitting posture of the seated person when the backrest is tilted backward can be maintained as appropriate as possible. That is, if the seat part were to be moved only upward by the seat support, the seated person may not be able to maintain an appropriate posture with his or her back in close contact with the backrest that is tilted backwards.However, according to the present invention, the seat support Since the seat portion also moves in the lateral direction, it is possible to adjust the seat so that the back of the seated person is in close contact with the backrest that is tilted backwards. In particular, the shapes and mounting angles of the seat and backrest vary depending on the chair, and the present invention adjusts the dimensions of the vertical elongated hole, the first sliding elongated hole, and the second sliding elongated hole according to these various circumstances. It is also possible to easily make fine adjustments to the design, such as changing the position, tilt, etc.

着座者が背凭れを後傾させていない状態の椅子の側面図。The side view of the chair in a state where the seated person is not leaning the backrest backward. 着座者が背凭れを後傾させた状態の椅子を示す側面図。FIG. 3 is a side view showing the chair with the backrest tilted backwards by the seated person. 受台部の分解斜視図。FIG. 3 is an exploded perspective view of the cradle. 受台部の平面図。A plan view of the pedestal part. 受台部の側面縦断面図。FIG. 3 is a side vertical cross-sectional view of the cradle. 受台部の座部昇降機構の動作を示す側面図及び側面縦断面図。FIG. 7 is a side view and a side vertical cross-sectional view showing the operation of the seat lifting mechanism of the cradle. 座受の前端部を上方へ移動させる昇降手段の他の実施形態を示す受台部の側面図。FIG. 7 is a side view of the pedestal section showing another embodiment of the elevating means for moving the front end of the pedestal upward. 背凭れの傾斜角度をロックする機構を説明する受台部の側面図及び側面縦断面図。FIG. 3 is a side view and a side vertical cross-sectional view of a pedestal portion, illustrating a mechanism for locking the inclination angle of the backrest.

以下、本発明に係る椅子の実施の形態を図面に基づき説明する。図１は着座者が背凭れを後傾させていない状態の椅子の側面図、図２は着座者が背凭れを後傾させた状態の椅子を示す側面図、図３は受台部の分解斜視図、図４は受台部の平面図、図５は受台部の縦断面側面図、図６は受台部の座部昇降機構の動作を示す側面図及び縦断面側面図である。本実施形態の椅子は、脚部１と、脚部１の上方に配置される座部２と、脚部１と座部２との間に位置し脚部１に座部２を支持するための受台部３と、受台部３に接続され背凭れ４を支持する背凭れ支持部５と、背もたれ５の傾倒に応じて座部２が上下動するようにした座部昇降機構とによって概略構成されている。また、前述の受台部３はさらに、脚部１の上方に固着される支持ベース６と、座部２の下方に固着される座受７とを備えると共に、背凭れ支持部５の下端には、前方に延出し受台部３内に位置させる可動アーム８が形成されている。そして、これらの構成要素のうち、受台部３の支持ベース６及び座受７、背凭れ支持部５の下端に設けられた可動アーム８を組み合わせることで、背もたれ５の傾倒に応じて座部２を上下動可能にする座部昇降機構が形成されている。また、本実施形態の椅子が備える座部昇降機構は、座部２を単に上下動させるのみではなく、横方向への移動も可能に構成されている。さらに、本実施形態において説明する椅子は、座受７の前端部を上下動させるための昇降手段としてリンク部材９を備えている。なお、本実施形態の説明において、「後」とは、椅子の背凭れ４側を示し、「前」とは、その反対側、「右」「左」とは、椅子を「前」から見た際の「右」「左」を示すものとする。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a chair according to the present invention will be described based on the drawings. Figure 1 is a side view of the chair with the seat back not tilted backwards, Figure 2 is a side view of the chair with the seat back tilted back, and Figure 3 is an exploded view of the pedestal. 4 is a plan view of the cradle, FIG. 5 is a vertical cross-sectional side view of the cradle, and FIG. 6 is a side view and a longitudinal sectional side view showing the operation of the seat lifting mechanism of the cradle. The chair of this embodiment has a leg section 1, a seat section 2 disposed above the leg section 1, and a seat section 2 located between the leg section 1 and the seat section 2 so as to support the seat section 2 on the leg section 1. A pedestal part 3, a backrest support part 5 connected to the pedestal part 3 and supporting the backrest 4, and a seat part lifting mechanism that allows the seat part 2 to move up and down according to the tilting of the backrest 5. It is roughly structured. Further, the above-mentioned pedestal section 3 further includes a support base 6 fixed above the leg section 1 and a seat support 7 fixed below the seat section 2. A movable arm 8 is formed which extends forward and is positioned within the pedestal portion 3. Among these components, by combining the support base 6 and seat support 7 of the pedestal part 3, and the movable arm 8 provided at the lower end of the backrest support part 5, the seat part can be adjusted according to the tilting of the backrest 5. A seat lifting mechanism is formed that allows the seat 2 to move up and down. Furthermore, the seat lifting mechanism included in the chair of this embodiment is configured to not only move the seat 2 up and down, but also to move it laterally. Further, the chair described in this embodiment includes a link member 9 as a lifting means for moving the front end of the seat support 7 up and down. In the description of this embodiment, "rear" refers to the backrest 4 side of the chair, "front" refers to the opposite side, and "right" and "left" refer to the backrest 4 side of the chair when viewed from the "front". This shall indicate "right" and "left" when

前記脚部１は、図１及び図２に示されているように、脚基部１０の中心部に脚支柱１１を設けて形成されている。具体的には、脚基部１０は、筒状部１０ａの中央から外方へ延出するように放射状に配された複数の脚足１０ｂ，１０ｂ，・・・を有し、筒状部１０ａの中心に貫通孔を備えて形成されている。また、脚基部１０の脚足１０ｂ，１０ｂ・・・の先端には、それぞれキャスター１２，１２・・・が装着されている。一方、脚支柱１１は、パイプ状の部材であり、脚基部１０の中心、すなわち、筒状部１０ａの貫通孔に挿入されて脚基部１０の上下に突出するように支持されている。なお、脚支柱１１は、図示はしないが内部にガススプリングを備えており、脚支柱１１上端の釦１１ａ（図５参照）が押圧されることにより、座部２に対する脚部１の高さを調節できるようになっている。 The leg portion 1 is formed by providing a leg support 11 in the center of a leg base portion 10, as shown in FIGS. 1 and 2. Specifically, the leg base 10 has a plurality of legs 10b, 10b, . . . arranged radially extending outward from the center of the cylindrical portion 10a, It is formed with a through hole in the center. Furthermore, casters 12, 12, . . . are attached to the tips of the legs 10b, 10b, . . . of the leg base 10, respectively. On the other hand, the leg support 11 is a pipe-shaped member, and is inserted into the center of the leg base 10, that is, into the through hole of the cylindrical part 10a, and is supported so as to protrude above and below the leg base 10. Although not shown, the leg support 11 is equipped with a gas spring inside, and when the button 11a (see FIG. 5) at the upper end of the leg support 11 is pressed, the height of the leg 1 relative to the seat 2 is adjusted. It is adjustable.

前記座部２は、底板上に弾力性を有する発砲ウレタン等の素材によって形成されたクッションを取着し、そのクッションの上面を被覆するように張地を張設した一般的なものである。 The seat portion 2 is a general type in which a cushion made of a resilient material such as urethane foam is attached to a bottom plate, and a material is stretched to cover the upper surface of the cushion.

前記受台部３は、脚部１と座部２との間に位置するように設けられて脚部１に座部２を支持するためのもので、脚部１側に固着される支持ベース６と、座部２側に固着される座受７とによって形成されている。 The pedestal part 3 is provided to be located between the leg part 1 and the seat part 2 to support the seat part 2 on the leg part 1, and is a support base fixed to the leg part 1 side. 6 and a seat support 7 fixed to the seat portion 2 side.

前記背凭れ支持部５は、背凭れ４を受台部３に接続して背凭れ４を支持しつつ椅子に装着する部材で、左右対称に形成された一対の支持部材１５，１５によって形成されている。具体的には、支持部材１５は、上下方向に所定の長さを有する起立棹部１５ａと、起立棹部１５ａの上端から前方に所定長さ延出させた上部棹部１５ｂと、起立棹部１５ａの下端から内側に所定長さ延出させ、さらにその内側端を前方に所定長さ延出させた下部棹部１５ｃとによって形成されている。そして、左右の起立棹部１５ａ，１５ａの上端部間に取付部材１６を介して背凭れ４が装着されている。この背凭れ４は、背面板の前面に弾力性を有する発砲ウレタン等の素材によって形成されたクッションを取着し、そのクッションの上面を被覆するように張地を張設した一般的なものである。また、背凭れ支持部５の上部棹部１５ｂは、着座者が肘を載せる肘掛けとしての役割を果たすことになる。ちなみに、この実施形態の椅子は、複数の棹状の部材を組み合わせて背凭れ支持部を形成しているが、これは一例で、例えば、背凭れ支持部を背凭れと一体化した板状に形成することも可能である。また、本実施形態の椅子のように、背凭れ支持部に肘掛けに相当する部位を必ず設けなければならないわけではない。 The backrest support part 5 is a member that connects the backrest 4 to the pedestal part 3 and is attached to the chair while supporting the backrest 4, and is formed by a pair of symmetrically formed support members 15, 15. ing. Specifically, the support member 15 includes an upright rod portion 15a having a predetermined length in the vertical direction, an upper rod portion 15b extending forward by a predetermined length from the upper end of the upright rod portion 15a, and an upright rod portion 15b. It is formed by a lower rod portion 15c that extends inward from the lower end of the lower rod portion 15a by a predetermined length, and further extends a predetermined length forward from the inner end of the lower rod portion 15a. The backrest 4 is attached via a mounting member 16 between the upper end portions of the left and right upright portions 15a, 15a. This backrest 4 is a general type in which a cushion made of a resilient material such as urethane foam is attached to the front surface of a back plate, and a material is stretched to cover the top surface of the cushion. be. Further, the upper arm portion 15b of the backrest support portion 5 serves as an armrest on which the seated person rests his or her elbows. Incidentally, in the chair of this embodiment, the backrest support part is formed by combining a plurality of rod-shaped members, but this is just one example. It is also possible to form Further, unlike the chair of this embodiment, it is not always necessary to provide a portion corresponding to an armrest on the back support portion.

前記支持ベース６は、脚部１の上方に固着される部材で、図３に示されているように、平面視矩形状のベース底板２０と、ベース底板２０の左右両側縁の各々から一体に起立させたベース側板２１，２１とによって形成されている。そして、図５に示されているように、ベース底板２０の後半部の略中央部に支柱挿通孔２２が穿設されており、また、ベース底板２０の後半部上面に支柱挿通孔２２を覆うように脚支柱取着部材２３が固着されている。この脚支柱取着部材２３は、前側板と後側板（ストッパー止め部）と天面板とからなる側面視下向きコ字形の部材で、このうち、天面板の中央部には支柱挿通孔２４が穿設されている。また、天面板の前端部と前側板の上端部に亘り切欠き２５が形成されている。そして、前述した脚支柱１１の上端部が、ベース底板２０の支柱挿通孔２２と脚支柱取着部材２３の支柱挿通孔２４に挿通され、筒体２６を介して支持ベース６に固着されている。他方、ベース底板２０の前半部の上面には、ロックカム収容部材２７が固着されている。このロックカム収容部材２７は、前板（リンク当部）と後板と天板とからなる側面視下向きコ字形の部材で、このうち、天板の中央部にはロックカム挿入用スリット２８が穿設されている。また、ロックカム収容部材２７の上面に傾斜ロックベース２９が取り付けられている。この傾斜ロックベース２９は、前後方向の寸法がロックカム収容部材２７と略同一で、且つベース側板２１，２１の間に収まるサイズに形成されている。また、傾斜ロックベース２９の前後方向中央部には、上下に貫通する横長のロックカム挿入用スリット３０が形成されている。さらに、傾斜ロックベース２９の挿入用スリット３０の前側には、上方へ突出する起立部３１が形成されており、この起立部３１の下端部分に前後に貫通する横長のロックプレート移動用スリット３２が形成されている。そして、ロックプレート移動用スリット３２にロックプレート３３が摺動自在に取着されている。一方、前述のロックカム収容部材２７内には、傾斜ロックカム３４が設けられている。この傾斜ロックカム３４は、その下部に後述するレバー部４３のロックカム連結部材４５を挿通させる筒部が形成されており、その上部はロック押え３５を介してロックプレート３３に取着されている。さらに、傾斜ロックベース２９の前端部には、左右方向に貫通するリンク用軸孔３６が穿設されている。また、傾斜ロックベース２９の上面には、ロックプレート３３を補強するための補強金具３７が装着されている。さらに、ロックカム収容部材２７の後板と脚支柱取着部材２３の前側板との間にプッシュパイプ３８が配置されている。このプッシュパイプ３８は、下部に後述するレバー部４３の回転ロッド４６を挿通させる筒部が形成されており、その上部には、下部から後方へ向かって延出する側面視横向きＬ字形の押下片３８ａが設けられている。他方、左右各々のベース側板２１，２１には、その前端部にリンク部材９を軸支するための第１リンク軸用孔３９，３９、その中間部に後述する可動軸８１を上下に移動させるための縦長の昇降長孔４０，４０、後端部に後述する固定軸８０を軸支するための固定軸用孔４１，４１が穿設されている。また、昇降長孔４０，４０の下方にレバー挿入孔４２，４２が穿設されている。さらに、図示はしないが、左側のベース側板２１の第１リンク軸用孔３９の下方に連結部材挿通孔が穿設されている。また、左右各々のベース側板２１，２１の前端部の上部は、前側に向かって下傾しており、ベース側板２１，２１の前端と上端の境目部分は円弧状になっている。さらに、支持ベース６には、その前端部左側に位置するようにレバー部４３が設けられている。このレバー部４３は、脚部１の高さを調整する場合と、座部２の傾斜角度を所定位置に保持する場合のそれぞれに使用されるもので、傾斜角調整用摘子４４ａを備えた筒状のレバー本体４４と、レバー本体４４の基端部に装着されたロックカム連結部材４５と、レバー本体の４４の中心部に挿通された回転ロッド４６と、レバー本体４４の先端側から突出する回転ロッド４６に嵌合させると共にレバー本体４４の先端に回転自在に遊嵌されている脚部昇降摘子４７とによって構成されている。そして、レバー部４３は、その回転ロッド４６をレバー挿入孔４２，４２に挿通させると共に、ロックカム連結部材４５を連結部材挿入孔に挿通させて、支持ベース６に装着されている。また、レバー部４３の回転ロッド４６は、プッシュパイプ３８の筒状部に貫通させており、レバー部４３の脚部昇降摘子４７を回転させることにより、プッシュパイプ３８も回転するようになっている。そして、プッシュパイプ３８が回転すると、その上部の押下片３８ａによって脚支柱１１上端の釦１１ａが押圧されて、座部２に対する脚支柱１１の高さ調節が可能になっている。また、レバー部４３のロックカム連結部材４５は、傾斜ロックカム３４の筒部に挿通されていて、傾斜角調整用摘子４４ａを回転させると、これに連動して傾斜ロックカム３４及ロックプレート３３を移動させるようになっている。 The support base 6 is a member fixed above the leg portion 1, and as shown in FIG. It is formed by upright base side plates 21, 21. As shown in FIG. 5, a column insertion hole 22 is bored approximately in the center of the rear half of the base bottom plate 20, and the column insertion hole 22 is covered on the upper surface of the rear half of the base bottom plate 20. The leg support attachment member 23 is fixed in this manner. This leg support attachment member 23 is a U-shaped member facing downward in side view, and is composed of a front side plate, a rear side plate (stopper stopper portion), and a top plate, and a support insertion hole 24 is bored in the center of the top plate. It is set up. Further, a notch 25 is formed across the front end of the top plate and the upper end of the front side plate. The upper end portion of the leg strut 11 described above is inserted into the strut insertion hole 22 of the base bottom plate 20 and the strut insertion hole 24 of the leg strut attachment member 23, and is fixed to the support base 6 via the cylindrical body 26. . On the other hand, a lock cam housing member 27 is fixed to the upper surface of the front half of the base bottom plate 20. This lock cam accommodating member 27 is a downward U-shaped member when viewed from the side, consisting of a front plate (link part), a rear plate, and a top plate. A slit 28 for inserting the lock cam is bored in the center of the top plate. has been done. Further, an inclined lock base 29 is attached to the upper surface of the lock cam housing member 27. The inclined lock base 29 has substantially the same dimension in the front-rear direction as the lock cam housing member 27, and is formed in a size that fits between the base side plates 21, 21. Further, a horizontally elongated lock cam insertion slit 30 that penetrates vertically is formed in the center of the inclined lock base 29 in the front-rear direction. Furthermore, an upright portion 31 that protrudes upward is formed on the front side of the insertion slit 30 of the inclined lock base 29, and a horizontally elongated lock plate movement slit 32 that penetrates the lower end portion of this upright portion 31 back and forth is formed. It is formed. A lock plate 33 is slidably attached to the lock plate moving slit 32. On the other hand, an inclined lock cam 34 is provided within the lock cam housing member 27 described above. The inclined lock cam 34 has a cylindrical portion formed at its lower portion through which a lock cam connecting member 45 of a lever portion 43 (described later) is inserted, and its upper portion is attached to the lock plate 33 via a lock presser 35. Furthermore, a link shaft hole 36 is bored in the front end of the tilted lock base 29, passing through it in the left-right direction. Furthermore, a reinforcing metal fitting 37 for reinforcing the lock plate 33 is attached to the upper surface of the inclined lock base 29. Further, a push pipe 38 is disposed between the rear plate of the lock cam housing member 27 and the front plate of the leg post attachment member 23. This push pipe 38 has a cylindrical portion formed at its lower part through which a rotating rod 46 of a lever section 43 (described later) is inserted, and its upper part has a push-down piece that is horizontally L-shaped in side view and extends rearward from the lower part. 38a is provided. On the other hand, the left and right base side plates 21, 21 have first link shaft holes 39, 39 at their front ends for pivotally supporting the link member 9, and a movable shaft 81, which will be described later, in the intermediate part thereof to move up and down. There are vertically elongated elongated elevating holes 40, 40 for use in the vehicle, and fixing shaft holes 41, 41 for pivotally supporting a fixed shaft 80, which will be described later, at the rear end. In addition, lever insertion holes 42, 42 are bored below the vertical elongated holes 40, 40. Further, although not shown, a connecting member insertion hole is bored below the first link shaft hole 39 in the left base side plate 21. Further, the upper portions of the front end portions of the left and right base side plates 21, 21 are inclined downward toward the front side, and the boundary portions between the front ends and the upper ends of the base side plates 21, 21 are arcuate. Further, the support base 6 is provided with a lever portion 43 located on the left side of its front end. This lever part 43 is used for adjusting the height of the leg part 1 and for holding the inclination angle of the seat part 2 at a predetermined position, and is provided with a knob 44a for adjusting the inclination angle. A cylindrical lever body 44, a lock cam connecting member 45 attached to the proximal end of the lever body 44, a rotating rod 46 inserted through the center of the lever body 44, and protruding from the tip side of the lever body 44. It is constituted by a leg raising/lowering knob 47 which is fitted into the rotary rod 46 and rotatably loosely fitted to the tip of the lever main body 44. The lever portion 43 is attached to the support base 6 by inserting its rotary rod 46 into the lever insertion holes 42, 42 and by inserting the lock cam connection member 45 into the connection member insertion hole. Further, the rotating rod 46 of the lever portion 43 is passed through the cylindrical portion of the push pipe 38, and by rotating the leg lifting knob 47 of the lever portion 43, the push pipe 38 is also rotated. There is. Then, when the push pipe 38 rotates, the button 11a at the upper end of the leg support 11 is pressed by the push-down piece 38a at the top thereof, so that the height of the leg support 11 relative to the seat portion 2 can be adjusted. Further, the lock cam connecting member 45 of the lever part 43 is inserted into the cylindrical part of the tilt lock cam 34, and when the tilt angle adjusting knob 44a is rotated, the tilt lock cam 34 and the lock plate 33 are moved in conjunction with this. It is designed to allow

前記座受７は、座部２の下面に固着される部材で、左右に所定間隔を設けて位置する前後方向に長い矩形状の座部取付板４８、４８と、座部取付板４８、４８の各々の内側端から一体に垂下させた座受側板４９，４９と、これら座受側板４９，４９の前端部と後端部であり、左右の座受側板４９，４９の内側間に架け渡された丸棒状の横架部材５０，５０によって形成されている。また、左右の座部取付板４８、４８の前端部と後端部には、螺子挿通孔５１，５１・・・が穿設されており、この螺子挿通孔５１，５１・・・に螺子を挿入して座受７を座部２の底板下面に螺着している。さらに、左右の座受側板４９，４９の前端部には、後述する第２リンク軸８４を挿通するための第２リンク軸用孔５２，５２が穿設されており、また、左右の座受側板４９，４９の前後方向略中央には、後述する可動軸８１を横方向へ摺動させるための横長の第２摺動長孔５３，５３が穿設されており、左右の座受側板４９，４９の後端部には、後述する固定軸８０を摺動させるための横長の第１摺動長孔５４，５４が穿設されている。なお、第１摺動長孔５４，５４と第２摺動長孔５３，５３は、前後方向に横並びに配置されており、このうち、第１摺動長孔５４，５４は、上側が凸となる円弧状であり、また、後方に向かってやや下傾している。一方、第２摺動長孔５３，５３は、下側が凸となる円弧状であり、前方に向かってやや下傾している。なお、左右の座受側板４９，４９の内寸は、前述した支持ベース６のベース側板２１，２１の内寸よりも若干長く設定されている。従って、座受７を支持ベース６の上側に配置させたとき、左右の座受側板４９，４９は、支持ベース６のベース側板２１，２１の外側に位置することになる。また、座受７の前後方向の長さは、支持ベース６の前後方向の長さよりも長く設定されている。従って、座受７を支持ベース６の上側に配置させたとき、座受７の前端及び後端のいずれもが支持ベース７の前端及び後端から食み出して位置することになる。ちなみに、この実施形態の座受７は、左右に一対存在する座部取付板４８と座受側板４９からなる部材を横架部材５０，５０によって一体化した例を示したが、座部取付板４８と座受側板４９からなる部材が左右に一対存在していれば、必ずしも両者を一体化しなくても、本発明の目的は達成できる。すなわち、座受は、少なくとも座部取付板と座受側板を備えた部材が左右に一対存在していればよい。 The seat support 7 is a member fixed to the lower surface of the seat 2, and includes seat mounting plates 48, 48, which are rectangular in the front-rear direction and are located at a predetermined interval from side to side, and seat mounting plates 48, 48, which are long in the front-rear direction. Seat support side plates 49, 49 that are integrally suspended from the inner ends of each of It is formed by round bar-shaped horizontal members 50, 50. Further, screw insertion holes 51, 51... are bored in the front and rear ends of the left and right seat mounting plates 48, 48, and screws are inserted into the screw insertion holes 51, 51... The seat support 7 is inserted and screwed onto the lower surface of the bottom plate of the seat portion 2. Furthermore, holes 52, 52 for second link shafts are bored in the front ends of the left and right seat support side plates 49, 49 for inserting a second link shaft 84, which will be described later. Horizontally long second sliding holes 53, 53 for laterally sliding a movable shaft 81, which will be described later, are bored in approximately the center of the side plates 49, 49 in the front-rear direction. , 49 are provided with horizontally long first sliding holes 54, 54 for sliding a fixed shaft 80, which will be described later. The first sliding elongated holes 54, 54 and the second sliding elongated holes 53, 53 are arranged side by side in the front-rear direction, and among these, the first sliding elongated holes 54, 54 have a convex upper side. It is arc-shaped and slopes slightly downward toward the rear. On the other hand, the second sliding elongated holes 53, 53 have an arcuate shape with a convex lower side, and are slightly inclined downward toward the front. Note that the inner dimensions of the left and right seat support side plates 49, 49 are set to be slightly longer than the inner dimensions of the base side plates 21, 21 of the support base 6 described above. Therefore, when the seat support 7 is placed above the support base 6, the left and right seat support side plates 49, 49 are located outside the base side plates 21, 21 of the support base 6. Further, the length of the seat support 7 in the front-rear direction is set longer than the length of the support base 6 in the front-rear direction. Therefore, when the seat support 7 is placed above the support base 6, both the front end and the rear end of the seat support 7 protrude from the front and rear ends of the support base 7. Incidentally, the seat support 7 of this embodiment has been shown as an example in which a pair of left and right seat mounting plates 48 and seat support side plates 49 are integrated by horizontal members 50, 50. As long as there is a pair of members consisting of the seat plate 48 and the seat support side plate 49 on the left and right, the object of the present invention can be achieved without necessarily integrating the two members. That is, the seat support only needs to include a pair of members on the left and right sides, each of which includes at least a seat mounting plate and a seat support side plate.

前記可動アーム８は、背凭れ支持部５の下部棹部１５ｃの前端部に連結される部材で、平面視矩形状の底板５５と、底板５５の左右両側縁の各々から一体に起立させた側板５６，５６とによって形成されている。そして、可動アーム８は、その前半部が受台部３内、具体的には支持ベース６と座受７の間に位置し、その後半部が受台部３の後方、具体的には、支持ベース６と座受７の後方へ突出するように配置されている。この可動アーム８の底板５５の前半部には矩形状の開口５７が開設されており、可動アーム８を受台３内に配置させた際、開口５７から支持ベース６に固着された脚支柱１１の上端部、及びプッシュパイプ３８上部の押下片３８ａを突出させられるようになっている。また、底板２０の後半部は、背凭れ支持部５の下部棹部１５ｃを取り付けるための取付部になっており、この取付部に穿設されている複数の取付穴にボルトを挿通して凭れ支持部５と連結されている。また、底板２０の前端部上面には傾斜ロック部材６０が装着されている。この傾斜ロック部材６０は、平面視矩形の凹状に形成されており、両側端部は後述する可動軸８１を挿通支持する軸受６１，６１になっている。また、傾斜ロック部材６０の前面には、複数の凹部６２，６２が形成されており、これら凹部６２，６２は、支持ベース６のロックプレート３３を受け入れる部位になっている。また、傾斜ロック部材６０の上面には、可動アーム８を補強するための補強金具６３が装着されている。さらに、底板５５の前後方向略中央部、具体的には、底板５５の取付部の前端部下面に側面視三角形状の傾斜ストッパー６５が装着されている。他方、可動アーム８の左右の側板５６，５６には、その前端部下方に後述する可動軸８１を挿通するための可動軸用孔６７，６７が穿設されており、前後方向略中央上方に後述する固定軸８０を挿通するための固定軸用孔６８，６８が穿設されている。これら可動軸用孔６７と固定軸用孔６８の位置関係としては、固定軸用孔６８の方が可動軸用孔６７よりも上方に位置するように設定されている。また、左右の側板５６，５６における固定軸用孔６８，６８よりもやや後方位置には、左右の側板５６，５６の内側に架け渡されるように丸棒状のバネ掛止部６９が設けられている。さらに、左右の側板の５６，５６の固定軸用孔６８，６８の間に２つの捩りコイルバネ７０，７０が取り付けられている。具体的には、２つの捩りコイルバネ７０，７０を左右横並びに配置し、これらのコイル部に外側から２つの筒状バネ支え７１，７１を挿入し、且つ２つの筒状バネ支え７１，７１を中央で合体させることによって捩りコイルバネ７０，７０を装着している。なお、これら筒状バネ支え７１，７１は、その中心に固定軸８０を挿通する貫通孔が形成されている。また、捩りコイルバネ７０，７０は、コイル部から後方に直線状に延びる自由端部がバネ掛止部６９に掛止されており、コイル部から前方に直線状に延びる自由端部がバネ押え部材７２によって固定されている。なお、バネ押さえ部材７２は、その下端部を底板５５の開口５７に臨ませて支持ベース６に固着している。なお、この捩りコイルバネ７０，７０により、背凭れ４は、これに外力が加わらない限り、後傾していない通常の状態を維持することができる。ちなみに、この実施形態においては、可動アーム８の例として、背凭れ支持部５の下部棹部１５ｃに別途装着する例を示したが、必ずこのようにする必要はなく、例えば、可動アームを背凭れ支持部の下部に連続させて背凭れ支持部と一体に形成してもよい。すなわち、可動アームは、背凭れ支持部と一体に形成されていても本発明の目的は達成できる。 The movable arm 8 is a member connected to the front end of the lower arm portion 15c of the backrest support portion 5, and includes a bottom plate 55 that is rectangular in plan view, and side plates that stand up integrally from both left and right edges of the bottom plate 55. 56, 56. The first half of the movable arm 8 is located within the pedestal section 3, specifically between the support base 6 and the seat support 7, and the rear half thereof is located behind the pedestal section 3, specifically, It is arranged so as to protrude rearward from the support base 6 and the seat support 7. A rectangular opening 57 is formed in the front half of the bottom plate 55 of the movable arm 8, and when the movable arm 8 is placed in the pedestal 3, the leg support 11 fixed to the support base 6 can be seen through the opening 57. The upper end of the push pipe 38 and the push-down piece 38a at the top of the push pipe 38 can be made to protrude. In addition, the rear half of the bottom plate 20 is a mounting part for attaching the lower shoulder part 15c of the backrest support part 5, and bolts are inserted into the plurality of mounting holes drilled in this mounting part to attach the lower part 15c of the backrest support part 5. It is connected to the support part 5. Further, an inclined locking member 60 is attached to the upper surface of the front end portion of the bottom plate 20. The tilt locking member 60 is formed into a rectangular concave shape in plan view, and both end portions thereof are bearings 61, 61 through which a movable shaft 81, which will be described later, is inserted and supported. Further, a plurality of recesses 62 , 62 are formed on the front surface of the inclined locking member 60 , and these recesses 62 , 62 serve as sites for receiving the lock plate 33 of the support base 6 . Furthermore, a reinforcing metal fitting 63 for reinforcing the movable arm 8 is attached to the upper surface of the inclined locking member 60. Further, an inclined stopper 65 having a triangular shape in side view is attached to a substantially central portion of the bottom plate 55 in the front-back direction, specifically, to the lower surface of the front end of the mounting portion of the bottom plate 55. On the other hand, in the left and right side plates 56, 56 of the movable arm 8, movable shaft holes 67, 67 for inserting a movable shaft 81, which will be described later, are formed below the front ends thereof, and holes 67, 67 for the movable shafts are bored at approximately the center upper part in the front-rear direction. Fixed shaft holes 68, 68 are bored through which a fixed shaft 80, which will be described later, is inserted. The positional relationship between the movable shaft hole 67 and the fixed shaft hole 68 is such that the fixed shaft hole 68 is located higher than the movable shaft hole 67. Further, a round bar-shaped spring hook part 69 is provided at a slightly rearward position of the fixed shaft holes 68, 68 in the left and right side plates 56, 56 so as to span inside the left and right side plates 56, 56. There is. Furthermore, two torsion coil springs 70, 70 are attached between the fixed shaft holes 68, 68 of the left and right side plates 56, 56. Specifically, two torsion coil springs 70, 70 are arranged side by side on the left and right, two cylindrical spring supports 71, 71 are inserted into these coil parts from the outside, and the two cylindrical spring supports 71, 71 are The torsion coil springs 70, 70 are attached by combining them at the center. It should be noted that these cylindrical spring supports 71, 71 have a through hole formed in the center thereof through which the fixed shaft 80 is inserted. Furthermore, the torsion coil springs 70, 70 have free ends extending linearly rearward from the coil portions hooked to the spring hooking portion 69, and free ends extending linearly forward from the coil portions latching onto the spring holding member. 72. The spring pressing member 72 is fixed to the support base 6 with its lower end facing the opening 57 of the bottom plate 55. The torsion coil springs 70, 70 allow the backrest 4 to maintain its normal state in which it is not tilted backwards unless an external force is applied thereto. Incidentally, in this embodiment, as an example of the movable arm 8, an example is shown in which the movable arm 8 is separately attached to the lower shaft part 15c of the backrest support part 5, but it is not always necessary to do this. It may be formed integrally with the back support part so as to be continuous with the lower part of the back support part. That is, even if the movable arm is formed integrally with the backrest support part, the object of the present invention can be achieved.

前記リンク部材９は、支持ベース６と座受７のそれぞれに軸支されて支持ベース６に対して座受７の前端部を上下動させる部材である。このリンク部材９は、所定の厚みを有し前側下方に嘴状の回り止め部９ａが形成されていると共に、下端部の左右のそれぞれに後述する第１リンク軸８３を挿通するための第１リンク軸受９ｂが形成され、上端部の左右のそれぞれに後述する第２リンク軸８４を挿通するための第２リンク軸受９ｃが形成されている。また、リンク部材９の左右方向の長さは、支持ベース６の左右方向の外寸と略一致しているが、回り止め部９ａの下端部からリンク部材９の後端にかけて薄厚にした細幅の薄厚部９ｄが形成されている。そして、この薄厚部９ｄによって、リンク部材９が回動した際、リンク部材９を支持ベース６のベース側板２１の前側上端部を滑らかに摺動させることができるようになっている。 The link member 9 is a member that is pivotally supported by the support base 6 and the seat support 7, respectively, and allows the front end of the seat support 7 to move up and down with respect to the support base 6. This link member 9 has a predetermined thickness and has a beak-shaped rotation stopper 9a formed at the lower front side, and a first link shaft 83 for inserting a first link shaft 83, which will be described later, into each of the left and right sides of the lower end. A link bearing 9b is formed, and second link bearings 9c for inserting a second link shaft 84, which will be described later, are formed on the left and right sides of the upper end, respectively. Further, the length of the link member 9 in the left-right direction is approximately the same as the outer dimension of the support base 6 in the left-right direction, but the width is made thinner from the lower end of the detent portion 9a to the rear end of the link member 9. A thin portion 9d is formed. The thin portion 9d allows the link member 9 to smoothly slide on the front upper end of the base side plate 21 of the support base 6 when the link member 9 rotates.

以上のように、受台部３は支持ベース６と座受７とによって形成され、支持ベース６と座受７の内側に可動アーム８を内在させているが、これらに固定軸８０、可動軸８１を枢支することによって座部昇降機構が構成されることになる。すなわち、固定軸８０が外側に位置する座受７の座受側板４９の第１摺動長孔５４、真ん中に位置する支持ベース６のベース側板２１の固定軸用孔４１、内側に位置する可動アーム８の側板５６の固定軸用孔６８にそれぞれ挿通されて枢支されている。また、可動軸８１が外側に位置する座受７の座受側板４９の第２摺動長孔５３、真ん中に位置する支持ベース６のベース側板２１の縦長の昇降長孔４０、内側に位置する可動アーム８の側板５６の可動軸用孔６７に挿通されて枢支されている。そして、座受側板４９の第１摺動長孔５４が、ベース側板２１の固定軸用孔４１及び可動アーム８の側板５６の固定軸用孔６８と交差する位置にあり、座受側板４９の第２摺動長孔５３が、ベース側板２１の昇降長孔４０及び可動アーム８の側板５６の可動軸用孔６７と交差する位置にある。これによって、可動アーム８の傾動に伴って、座受７が固着されている座部２が上下方向に移動すると共に、左右方向へ移動することになる。なお、これについての詳細は後述する。また、本実施形態における椅子は、座部昇降機構の一部として支持ベース６に対して座受７の前端部を昇降させるための昇降手段が設けられている。すなわち、第１リンク軸８３が外側に位置する支持ベース６の第１リンク軸用孔３９、その内側に位置させたリンク部材９の第１リンク軸受９ｂ、さらにその内側に位置する傾斜ロックベース２９のリンク用軸孔３６にそれぞれ挿通されて枢支されている。また、第２リンク軸８４が外側に位置する座受７の座受側板４９の第２リンク軸用孔５２、その内側に位置させたリンク部材９の第２リンク軸受９ｃにそれぞれ挿通されて枢支されている。 As described above, the pedestal part 3 is formed by the support base 6 and the seat support 7, and the movable arm 8 is built inside the support base 6 and the seat support 7. By pivoting 81, a seat lifting mechanism is constructed. That is, the first sliding elongated hole 54 of the seat support side plate 49 of the seat support 7 where the fixed shaft 80 is located on the outside, the fixed shaft hole 41 of the base side plate 21 of the support base 6 located in the middle, and the movable hole located on the inside. The arms 8 are respectively inserted into fixed shaft holes 68 in the side plates 56 and are pivotally supported. Further, the second sliding elongated hole 53 of the seat support side plate 49 of the seat support 7 where the movable shaft 81 is located on the outside, the vertically elongated elevating elongated hole 40 of the base side plate 21 of the support base 6 located in the middle, and the vertically elongated elongated hole 40 of the base side plate 21 of the support base 6 located in the middle. The movable arm 8 is inserted into a movable shaft hole 67 in the side plate 56 and is pivotally supported. The first sliding elongated hole 54 of the seat support side plate 49 is located at a position where it intersects with the fixed shaft hole 41 of the base side plate 21 and the fixed shaft hole 68 of the side plate 56 of the movable arm 8. The second sliding elongated hole 53 is located at a position where it intersects with the elevation elongated hole 40 of the base side plate 21 and the movable shaft hole 67 of the side plate 56 of the movable arm 8 . As a result, as the movable arm 8 tilts, the seat portion 2 to which the seat support 7 is fixed moves vertically as well as horizontally. Note that details regarding this will be described later. Further, the chair in this embodiment is provided with an elevating means for elevating the front end portion of the seat support 7 with respect to the support base 6 as part of the seat elevating mechanism. That is, the first link shaft hole 39 of the support base 6 in which the first link shaft 83 is located outside, the first link bearing 9b of the link member 9 located inside the first link shaft hole 39, and the inclined lock base 29 located inside the first link shaft hole 39. are respectively inserted into the link shaft holes 36 and pivotally supported. Further, the second link shaft 84 is inserted into the second link shaft hole 52 of the seat support side plate 49 of the seat support 7 located on the outside, and the second link bearing 9c of the link member 9 located inside thereof, so that the second link shaft 84 can rotate supported.

次に、上記のように構成された本実施形態の椅子の作用について説明する。図１及び図６（ａ）は、着座者が背凭れ４を後傾させていないノーマルな状態を示している。この状態において、背凭れ支持部６と連結されている可動アーム８は、支持ベース６の内側において、略水平な状態に保持されている。そして、受台部３の前後方向略中央であり、可動アーム８の前端部に枢支されている可動軸８１は、支持ベース６のベース側板２１の昇降長孔４０の下端に位置し、座受７の座受側板４９の第２摺動長孔５３の後端に位置している。また、受台部３の後端部であり、可動アーム８の前後方向中央部に枢支されている固定軸８０は、座受７の座受側板４９の第１摺動長孔５４の後端に位置している。さらに、受台部３の前端部において支持ベース６と座受７に枢支されているリンク部材９は、その回り止め部９ａの内側（後側）が支持ベース６の前端に当接した状態になっている。そして、着座者が背凭れ４を背中で押すように体重を掛けると背凭れ４が後傾し、これに伴って、可動アーム８が固定軸８０を支点として、その前側が上方へと回動する。すなわち、可動アーム８前端部の可動軸用孔６７に枢支されている可動軸８１が支持ベース６の昇降長孔４０に沿って上方へと移動することで可動アーム８の前側が持ち上がるように移動する。この時、座受７の横長の第２摺動長孔５３が支持ベース６の昇降長孔４０と交差していることから、可動軸８１の上動に伴って座受７の前後方向中央部も持ち上げられる。同時に、図６（ｂ）及び図６（ｃ）に示されているように、可動軸８１が座受７の第２摺動長孔５３を前方に向かって摺動すると共に、固定軸８０が第１摺動長孔５４を前方に向かって摺動するため、座受７は徐々に後方へと移動していくことになる。さらに、座受７の前端は、リンク部材９によって上方へと持ち上げられる。なお、リンク部材９が座受７の前端を持ち上げる際、リンク部材９の薄厚部９ｄより内側部分がベース側板２１の円弧状の前側上端部及びその後側の傾斜を沿うように摺動するため、リンク部材９は、スムーズに上昇していくことになる。ちなみに、図６（ｂ）では、可動アーム８が図６（ａ）のノーマルの状態から１０度下傾しており、図６（ｃ）では、可動アーム８が図６（ａ）のノーマルの状態から２０度下傾している。そして、図６（ｃ）の状態に至ると、可動アーム８の下面に設けられた傾斜ストッパー６５が支持ベース６の脚支柱取着部材２３の後側板（ストッパー止め部）に当接し、これ以上可動アーム８が回動しないようになっている。一方、着座者が背凭れ４に掛けていた体重を解放すれば、前述の動作と逆の動作によって、図６（ａ）のノーマルな状態に戻ることになる。このように本実施形態に示した椅子は、着座者が背凭れ４を背中で押すように体重を掛けると、それに応じて座部２が上昇するようになっている、すなわち、着座者の体重の増減に応じて背凭れ４を後傾させる力も変化させるいわゆる体重感知機能を備えている。もっとも、本実施形態の椅子は、単にそれのみならず、座部２の上昇に伴って、座部２が後方へと移動するようになっている。換言すれば、背凭れ４の後傾に追随するように座部２の上昇と座部２の後方移動が同時に起こるため、着座者が背凭れ４に寄り掛かって背凭れ４が後傾しても、座部２が移動して座部２に座っている着座者の体ごと後傾していく背凭れ４に近づいていくことになる。従って、着座者の背中は、背凭れ４がどの位置にあっても確実に背凭れ４に接した状態を維持することができる。 Next, the operation of the chair of this embodiment configured as described above will be explained. 1 and 6(a) show a normal state in which the seated person does not tilt the backrest 4 backward. In this state, the movable arm 8 connected to the backrest support part 6 is held in a substantially horizontal state inside the support base 6. A movable shaft 81, which is approximately in the center of the pedestal part 3 in the front-rear direction and is pivotally supported by the front end of the movable arm 8, is located at the lower end of the elongated elongated hole 40 of the base side plate 21 of the support base 6, and It is located at the rear end of the second sliding elongated hole 53 of the seat side plate 49 of the receiver 7. Further, the fixed shaft 80 which is the rear end of the pedestal part 3 and is pivotally supported at the center of the movable arm 8 in the longitudinal direction is behind the first sliding elongated hole 54 of the seat support side plate 49 of the seat support 7. Located at the edge. Further, the link member 9, which is pivotally supported by the support base 6 and the seat support 7 at the front end of the pedestal part 3, is in a state in which the inside (rear side) of the detent part 9a is in contact with the front end of the support base 6. It has become. When the seated person puts his or her weight on the backrest 4 with his or her back, the backrest 4 tilts backwards, and the front side of the movable arm 8 pivots upward about the fixed shaft 80. do. That is, the movable shaft 81, which is pivotally supported in the movable shaft hole 67 at the front end of the movable arm 8, moves upward along the vertical elongated hole 40 of the support base 6, so that the front side of the movable arm 8 is lifted. Moving. At this time, since the horizontally long second sliding elongated hole 53 of the seat support 7 intersects with the vertical elongation hole 40 of the support base 6, as the movable shaft 81 moves upward, the center of the seat support 7 in the front and rear direction can also be lifted. At the same time, as shown in FIGS. 6(b) and 6(c), the movable shaft 81 slides forward through the second sliding elongated hole 53 of the seat support 7, and the fixed shaft 80 moves forward. Since the seat support 7 slides forward through the first sliding elongated hole 54, it gradually moves rearward. Further, the front end of the seat support 7 is lifted upward by the link member 9. Note that when the link member 9 lifts the front end of the seat support 7, the inner part of the link member 9 from the thinner part 9d slides along the arc-shaped front upper end of the base side plate 21 and the rear slope. The link member 9 will rise smoothly. Incidentally, in FIG. 6(b), the movable arm 8 is tilted 10 degrees downward from the normal state in FIG. 6(a), and in FIG. 6(c), the movable arm 8 is tilted downward from the normal state in FIG. 6(a). It is tilted 20 degrees downward from the current state. When the state shown in FIG. 6(c) is reached, the inclined stopper 65 provided on the lower surface of the movable arm 8 comes into contact with the rear plate (stopper stopper part) of the leg strut attachment member 23 of the support base 6, and no more The movable arm 8 is prevented from rotating. On the other hand, if the seated person releases his or her weight on the backrest 4, the normal state shown in FIG. 6(a) will be restored by the opposite operation to the above-mentioned operation. In this way, the chair shown in this embodiment is designed so that when a seated person puts their weight on the backrest 4 with their back, the seat 2 rises in response to the weight of the seated person. It has a so-called weight sensing function that changes the force for tilting the backrest 4 backward in accordance with the increase or decrease in weight. However, in the chair of this embodiment, not only this, but also the seat 2 moves rearward as the seat 2 rises. In other words, the rise of the seat 2 and the rearward movement of the seat 2 occur simultaneously to follow the backward tilt of the backrest 4, so the seated person leans on the backrest 4 and the backrest 4 tilts backward. As the seat 2 moves, the seated person sitting on the seat 2 approaches the backrest 4, which is tilted backwards along with the body of the person sitting on the seat 2. Therefore, the seated person's back can reliably maintain a state in contact with the backrest 4 no matter where the backrest 4 is located.

図７は、座受７の前端部を上方へと移動させる昇降手段の他の実施形態を示すものである。なお、この実施形態のものは、前記実施形態のものと種々の点で構成が共通しているため、共通部分については同一符号を付して説明する。この昇降手段は、座受７の座受側板４９，４９の前端部に形成された縦長のガイド長孔９０，９０と、支持ベース６のベース側板２１，２１の前端部に穿設された軸孔に枢軸９１を軸支して構成されている。また、ガイド長孔９０は、その下端が前方に位置し上端が後方に位置する傾斜状になっており、且つ後側に凸となる円弧状になっている。そして、着座者が背凭れ４を後傾させると、可動アーム８の前端部が固定軸８０を支点として上方へと回動し、座受７の前後方向中央部が持ち上げられるが、これに連動して枢軸９１がガイド長孔９０，９０を下方に向かって摺動し、座受７の前端も持ち上げられていくことになる。すなわち、背凭れ４が後傾していない図７（ａ）の状態において、ガイド長孔９０，９０の上端に位置している固定軸９１は、可動アーム８の前端部の上昇に伴って下方に向かうように位置が変化し、背凭れ４の後傾が最も深くなると、図７（ｃ）に示されているように、ガイド長孔９０，９０の下端に位置することになる。この時、座受７の前端部が最も上方に持ち上げられた状態になる。 FIG. 7 shows another embodiment of the elevating means for moving the front end of the seat support 7 upward. It should be noted that this embodiment has a configuration common to that of the previous embodiment in various respects, so common parts will be described with the same reference numerals. This elevating means consists of vertically elongated guide holes 90, 90 formed in the front ends of the seat support side plates 49, 49 of the seat support 7, and shafts bored in the front ends of the base side plates 21, 21 of the support base 6. A pivot 91 is pivotally supported in the hole. Further, the guide elongated hole 90 has an inclined shape with its lower end located at the front and its upper end located at the rear, and has an arcuate shape convex toward the rear side. Then, when the seated person tilts the backrest 4 backward, the front end of the movable arm 8 rotates upward about the fixed shaft 80, and the central part of the seat support 7 in the longitudinal direction is lifted. Then, the pivot 91 slides downward through the guide elongated holes 90, 90, and the front end of the seat support 7 is also lifted. That is, when the backrest 4 is not tilted backwards in the state shown in FIG. When the position changes toward , and the backrest 4 is at its deepest inclination, it is located at the lower end of the guide elongated holes 90, 90, as shown in FIG. 7(c). At this time, the front end portion of the seat support 7 is in the state of being lifted up most upwardly.

次に、背凭れ４の傾斜角度をロックする機構について図８を参照しつつ説明する。図８（ａ）は、傾斜角度をロックしていない、すなわち、着座者が背凭れ４に凭れ掛かると、背凭れ４が自由に後傾し得る状態である。この状態において、支持ベース６の傾斜ロックベース２９上のロックプレート３３は、ロックプレート移動用スリット３２内に位置し、その後端が傾斜ロックベース２９の後端と面一、すなわち、傾斜ロックベース２９から食み出していない。ここで、着座者が背凭れ４を後傾できない状態にロックしたいと考えた場合、まず、支持ベース６の左側の前後方向中央部にあるレバー部４３の傾斜角調整用摘子４４ａを手で上方へ持ち上げる。これにより、傾斜角調整用摘子４４ａと一体のレバー本体４４が時計回り方向に回転する。そして、図８（ｂ）に示されているように、レバー本体４４に連結されているロックカム連結部材４５が後方へと移動する。さらに、ロックカム連結部材４５と支持ベース６のロックカム収容部材２７内で連結されている傾斜ロックカム３４の下端部が後方へと移動する。この時、傾斜ロックカム３４の中央部が軸支されていることから、傾斜ロックカム３４の上端部は下端部とは逆方向、すなわち、前方へと移動する。そうすると、傾斜ロックカム３４の上端部にロック押え３５で取着されているロックプレート３３も前方へと移動し、その後端が傾斜ロックベース２９の後端から食み出して、可動アーム８の前端に位置する傾斜ロック部材６０の上面に当接する。これにより、傾斜ロック部材６０の上面がロックプレート３３によって押さえつけられた状態になって、可動アーム８の上方への移動が規制されることになり、ひいては、背凭れ４の傾斜角度もロックされることになる。一方、着座者が背凭れ４を再び後傾可能な状態にしたいと考えた場合、前述の動作と逆の動作によって、図８（ａ）のフリーな状態に戻すことができる。なお、図８（ｂ）は、背凭れ４が後傾していないノーマルな状態での傾斜角度のロックを示しているが、背凭れ４を所定角度後傾させた位置でロックすることも可能である。すなわち、着座者が背凭れ４を後傾させた状態で、レバー部４３の傾斜角調整用摘子４４ａを手で上方へ持ち上げてやれば、可動アーム８の傾斜ロック部材６０の凹部６２にロックプレート３３が嵌り込んで、その位置で背凭れ４の後傾をロックすることができる。 Next, a mechanism for locking the inclination angle of the backrest 4 will be described with reference to FIG. 8. FIG. 8A shows a state in which the inclination angle is not locked, that is, when the seated person leans against the backrest 4, the backrest 4 can freely tilt backward. In this state, the lock plate 33 on the tilted lock base 29 of the support base 6 is located in the lock plate moving slit 32, and its rear end is flush with the rear end of the tilted lock base 29, that is, the tilted lock base 29 is flush with the rear end of the tilted lock base 29. It's not starting to bite. Here, if the seated person wishes to lock the backrest 4 in a state where it cannot be tilted backwards, first, the inclination angle adjusting knob 44a of the lever section 43 located at the center of the left side of the support base 6 in the longitudinal direction is manually operated. Lift upwards. As a result, the lever main body 44, which is integrated with the inclination angle adjusting knob 44a, rotates clockwise. Then, as shown in FIG. 8(b), the lock cam connecting member 45 connected to the lever body 44 moves rearward. Further, the lower end portion of the inclined lock cam 34, which is connected to the lock cam connecting member 45 within the lock cam housing member 27 of the support base 6, moves rearward. At this time, since the center portion of the tilt lock cam 34 is pivotally supported, the upper end of the tilt lock cam 34 moves in the opposite direction to the lower end, that is, forward. Then, the lock plate 33 attached to the upper end of the inclined lock cam 34 by the lock presser 35 also moves forward, and its rear end protrudes from the rear end of the inclined lock base 29 and connects to the front end of the movable arm 8. It abuts against the upper surface of the inclined locking member 60 located therein. As a result, the upper surface of the tilt locking member 60 is pressed down by the lock plate 33, and the upward movement of the movable arm 8 is restricted, and as a result, the tilt angle of the backrest 4 is also locked. It turns out. On the other hand, if the seated person wishes to return the backrest 4 to a state in which it can be tilted back, it can be returned to the free state shown in FIG. 8(a) by performing an action opposite to the above-described action. Although FIG. 8(b) shows the locking of the inclination angle in a normal state where the backrest 4 is not tilted backwards, it is also possible to lock the backrest 4 in a position where it is tilted backwards by a predetermined angle. It is. That is, if the seated person tilts the backrest 4 backward and lifts the inclination angle adjusting knob 44a of the lever part 43 upward by hand, it will lock into the recess 62 of the inclination locking member 60 of the movable arm 8. The plate 33 fits in and locks the rearward tilt of the backrest 4 at that position.

なお、本発明における昇降長孔は、縦長に形成されていれば、その長さは自由に設定可能である。さらに、前記実施形態で示したように必ずしも円弧状の長孔でなく、直線状の長孔であっても良く、また、昇降長孔が傾いて形成されていても良い。同様に、第１摺動長孔及び第２摺動長孔も、横長に形成されていれば、その長さは自由に設定することが可能である。このように、本発明において、昇降長孔、第１摺動長孔及び第２摺動長孔を自由に設定し得るので、例えば、後傾した背凭れに対して着座者の背中が密着した適正な姿勢になるように微妙な調整が可能になる。また、例えば、昇降長孔の長さを短くすれば、受台の厚みを薄くして、受台をコンパクトなサイズに設計することも可能である。いずれにしても、本発明における座部昇降機構を採用すると、体重感知式という機能を備えつつ、設計上の自由度が増えると共に、背凭れを後傾した際の着座者の着座姿勢を可能な限り適正な状態に保持させることができる。また、前記実施形態では、背もたれを後傾させた際、座受の前端が高く座受の後端が低くなるように、昇降長孔、第１摺動長孔、第２摺動長孔を設定しているが、必ずこのような設定にしなければならないわけではなく、座受の前端を低く座受の後端を高くする設定や、座受の前端と座受の後端が同じ高さになるように設定することも可能である。また、前記実施形態におけるガイド長孔は、縦長に形成されていれば、その長さや傾きは自由に設定可能である。 Note that the length of the elevating elongated hole in the present invention can be freely set as long as it is formed vertically. Furthermore, as shown in the embodiment, the elongated holes are not necessarily arc-shaped, but may be linear elongated holes, and the elevating elongated holes may be formed at an angle. Similarly, the lengths of the first sliding slot and the second sliding slot can be freely set as long as they are formed horizontally. In this way, in the present invention, the elongated elongated hole, the first elongated sliding hole, and the elongated sliding hole can be freely set, so that, for example, when the seated person's back is in close contact with the backrest that is tilted backwards, This allows for subtle adjustments to be made to achieve the correct posture. Further, for example, by shortening the length of the vertical elongated hole, the thickness of the pedestal can be reduced and the pedestal can be designed to have a compact size. In any case, if the seat lifting mechanism of the present invention is adopted, it has a weight sensing function, increases the degree of freedom in design, and allows the seater to change the sitting posture when the backrest is tilted backwards. It can be maintained in an appropriate state for as long as possible. In addition, in the embodiment, the elongated elongated hole, the first elongated sliding hole, and the elongated sliding hole are formed so that when the backrest is tilted backward, the front end of the seat support is high and the rear end of the seat support is low. However, it is not always necessary to set it like this.You can set the front end of the seat support low and the rear end of the seat high, or set the front end of the seat support and the rear end of the seat support at the same height. It is also possible to set it so that Moreover, the length and inclination of the guide elongated hole in the embodiment described above can be freely set as long as it is formed vertically.

１脚部
２座部
３受台部
４背凭れ
５背凭れ支持部
６支持ベース
７座受
８可動アーム
９リンク部材
４０昇降長孔
５３第２摺動長孔
５４第１摺動長孔
８０固定軸
８１可動軸
９０ガイド長孔
９１枢軸 1 Leg portion 2 Seat portion 3 Rest portion 4 Backrest 5 Backrest support portion 6 Support base 7 Seat support 8 Movable arm 9 Link member 40 Lifting elongated hole 53 Second sliding elongated hole 54 First sliding elongated hole 80 Fixed Shaft 81 Movable axis 90 Guide slot 91 Pivot

Claims

a leg part, a seat part disposed above the leg part, a pedestal part located between the leg part and the seat part for supporting the seat part on the leg part, and the pedestal part. A chair comprising: a backrest support part that is connected to the backrest and supports the backrest; and a seat lifting mechanism that moves the seat part up and down in accordance with the tilting of the backrest,
The pedestal part includes a support base fixed above the leg part and a seat support fixed below the seat part,
The seat lifting mechanism includes a movable arm that extends forward from a lower end of the backrest support and is positioned within the pedestal, and a movable arm that is provided at a rear end of the pedestal and synchronizes with the tilting of the backrest support. a fixed shaft that pivotally supports the movable arm in a tiltable manner with respect to the support base; and a fixed shaft that is located forward of the fixed shaft in the pedestal portion and supports the movable arm with respect to the support base as the movable arm tilts. a movable shaft that supports the movable shaft so as to be movable in the vertical direction; a vertical elongated elongated hole formed in the support base that allows the movable shaft to move up and down; a horizontally elongated first sliding elongated hole for causing the movable shaft to slide in the horizontal direction; 1. A chair comprising: elevating means provided at a position forward of the movable shaft for moving the front end of the seat support above the top portion along which the movable shaft moves.

2. The chair according to claim 1, wherein the elevating means is a link member pivotally supported by the support base and the seat support.

The elevating means includes a vertically elongated guide elongated hole formed in either the support base or the seat support, a shaft hole formed in either the support base or the seat support, the elevating elongate hole and the shaft. 2. The chair according to claim 1, further comprising a pivot shaft pivotally supported in the hole.