JPH0360606A - Reclining device for seat - Google Patents

Abstract

PURPOSE:To set the ratio between the seat backward reclining angle and the seat back reclining angle always to a specified value by forming a second guide groove with a radius of curvature greater than that of a first guide groove, and with the lower position of the second guide groove departing downward from the first guide groove toward its longitudinal direction. CONSTITUTION:A second guide groove 27 is formed with a radius of curvature greater than that of first guide grooves 25, 26 and with the lower position of the second guide groove 27 departing downward from the first guide grooves 25, 26 toward its longitudinal direction. Therefore, the backward reclining angle of a support rod 3 is uniquely defined according to the back downward tilting of a rear seat receiver 3. Further, the reclining angle of the support rod 21 may be set greater than the tilting angle of the back seat receiver 3. The tilting angle ratio between the backward tilting of the seat receivers 2, 3 and the backward tilting of the seat back section 22 becomes always constant when a passenger leans against the seat back section 22, if the shape of the guide groove 27 is formed so that the support rod 21 is reclined backward by an angle (theta2) which is twice the angle (theta1) of back downward rotation of the rear seat receiver 3 only or both the front and rear seat receivers 2 and 3 when the rear seat receiver 3 only or both the front and rear seat receivers 2 and 3 are rotated back downward by a unit angle (theta1).

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、椅子における座体及び背凭部を後傾動するた
めの装置の構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a device for tilting the seat and back of a chair backward.

〔従来の技術と発明が解決しようとする課題〕従来から
、椅子における座板とその後部から立設するように装着
された背凭部とを、着座する人の背凭れ掛けの程度に応
じて連動して後向き傾動するように構成する手段は種々
発明されている。[Prior Art and Problems to be Solved by the Invention] Conventionally, the seat plate of a chair and the backrest part that is attached to stand up from the rear of the chair have been adjusted according to the degree of the backrest of the person sitting on the chair. Various means have been invented for configuring the device to tilt backward in conjunction with each other.

そして、特開昭５８−１２７６１７号公報では、座板と
背凭とを一体的に傾動させるとき、背凭に接するワイシ
ャツ等の上衣がめくられる等の不体裁を解消する手段と
して、脚体上端に固定した箱型固定枠の後部に側面視り
型の背凭枠の前端部を軸着し、この背凭枠の屈曲部寄り
と、座板を載置する台枠の後端部とを軸着し、該台枠の
前部に軸支した水平軸を固定枠前端の略水平な長溝に挿
通させ、ガススプリングの後端を固定枠に、前端を水平
軸に各々枢着した構成を開示している。In Japanese Patent Application Laid-Open No. 58-127617, when the seat plate and the backrest are tilted together, the upper end of the leg body is The front end of a side-view backrest frame is pivoted to the rear of a box-shaped fixed frame fixed to A horizontal shaft that is pivoted to the front part of the underframe is inserted into a substantially horizontal long groove at the front end of the fixed frame, and the rear end of the gas spring is pivoted to the fixed frame, and the front end is pivoted to the horizontal shaft. Disclosed.

この構成においてガススプリングを自由状態にして背凭
枠に後向き力を加えると、当該背凭枠と固定枠との軸着
点を中心に後向き回動して、座板が取付く台枠を後向き
に引っ張りつつその後端を下向きに傾動させる。このと
き台枠は前端の水平軸箇所を中心に下向き回動する。In this configuration, when the gas spring is in a free state and a backward force is applied to the backrest frame, the backrest frame rotates backward around the pivot point between the backrest frame and the fixed frame, causing the underframe to which the seat plate is attached to face backward. Tilt the rear end downward while pulling it. At this time, the underframe rotates downward around the horizontal axis at the front end.

ところで、座仮に着座した人の背中面が後傾するとき、
人の接部にある上半身の回転中心であるヒップポイント
を中心として背中面が動く。そして、普通の身長・体格
の人の場合のヒップポイントは、椅子を側面から見て、
その座面から直角上方に略１２０ｍｍ及び背凭面から直
角前方向に略１２０Ｗｍ程度離れた交点となる。By the way, when a seated person's back tilts backwards,
The back surface moves around the hip point, which is the center of rotation of the upper body at the contact point of the person. The hip point for a person of normal height and build is determined by looking at the chair from the side.
The intersection point is approximately 120 mm perpendicularly upward from the seat surface and approximately 120 Wm perpendicularly forward from the backrest surface.

従って、前記ヒップポイントを略中心として椅子におけ
る背凭部が回動するときには、当該背凭部に接する背中
とのずれは全く生じないことになる。Therefore, when the backrest of the chair rotates approximately around the hip point, there will be no deviation from the back in contact with the backrest.

しかしながら、前記先行技術では、背凭枠が後傾すると
き、この背凭枠の屈曲部寄りと、座板の取付く台枠後端
部との軸着点を中心にして背凭枠が回動するので、この
軸着点は前記ヒップポイントから相当程度前れているこ
とになり、前記軸着点での背凭枠の回動角度が小さいと
、背中を上方に押しあげる感じとなり、反対に背冗枠の
回動角度が大き過ぎると、背中を下向きに引き摺る感じ
となる等、人の背中と背凭部との接触箇所での相対的ず
れが大きく生じるのであった。However, in the prior art, when the backrest frame tilts backward, the backrest frame rotates around the pivot point between the bent part of the backrest frame and the rear end of the underframe to which the seat plate is attached. As the pivot point moves, this pivot point will be quite far in front of the hip point, and if the rotation angle of the backrest frame at the pivot point is small, it will feel like your back is being pushed upwards, which is the opposite. If the rotation angle of the back support frame is too large, the backrest will feel like it is being dragged downwards, resulting in a large relative shift at the point of contact between the person's back and the backrest.

他方、座板が後下向きに傾動するとき、それに連動して
後傾動する背凭部の角度は、座板の傾動角度１に対して
背凭部の傾動角度が２の比率であることが人間工学的に
好ましいとされている。何故なら、座板の後下向き傾動
角度に比べて背凭枠の回動角度が小さいと背凭枠で背中
を前に押す感じを生じ、反対に背凭枠の回動角度が大き
過ぎると背凭枠が背中から離れる感じを生じるからであ
る。On the other hand, when the seat tilts rearward and downward, the angle of the backrest that tilts backward in conjunction with the tilting angle is 2 times the ratio of the tilting angle of the seat plate to 1. It is said to be preferable from an engineering perspective. This is because if the rotation angle of the backrest frame is small compared to the backward downward tilting angle of the seat plate, the backrest frame will feel like it is pushing your back forward, and on the other hand, if the rotational angle of the backrest frame is too large, the backrest will This is because the frame feels like it is separating from the back.

しかも、座板の後下向き角度が小さいときにおける背凭
部の回動角度の比率と、前記後下向き角度が大きいとき
におるけ背凭部の回動角度の比率が変動するときには、
もっと感じの悪い椅子となる。Moreover, when the ratio of the rotation angle of the backrest when the rearward downward angle of the seat plate is small and the ratio of the rotational angle of the backrest when the rearward downward angle is large,
This makes the chair even more uncomfortable.

そして、このような、背凭部に対する着座者の背中のず
れを生じることがなく、且つ座板の後傾角度と背凭部の
傾動角度を常時所定の比率になるように設定された礪構
を簡単に実現することが困難であった。And, such a structure is set so that the back of the seated person does not shift with respect to the backrest, and the backward tilt angle of the seat plate and the tilt angle of the backrest are always at a predetermined ratio. It was difficult to easily realize this.

本発明は、このような従来の問題点を解消することを目
的とするものである。The present invention aims to solve these conventional problems.

〔課題を解決するための手段〕[Means to solve the problem]

この目的を遠戚するため本発明は、脚体上部の支持枠体
に対して上向き付勢手段及びリンク機構を介して昇降動
自在に支持した前座受体と後座受体とを屈曲及び伸縮可
能な連結部材にて連結し、後座受体上方に適宜離れた位
置を中心に背凭部が後向き回動するように、後座受体に
形威した円弧状の第１ガイド溝に背凭部の支持杆下部を
ピン嵌合し、前記支持枠体には、前記背凭部の支持杆下
部の規制ピンを保合案内するための湾曲状の第２ガイド
溝を前記第１ガイド溝より下方位置に穿設し、該第２ガ
イド溝の湾曲曲率半径を前記第１ガイド溝より大きい曲
率半径とし、且つ第２ガイド溝の下部位置をその長平方
向に行くに従って第１ガイド溝より下方に離れるように
形威したものである。In order to achieve this object distantly, the present invention provides a front seat support and a rear seat support that are supported to be movable up and down through an upward biasing means and a link mechanism with respect to the support frame of the upper part of the leg body. The backrest is connected to a first arc-shaped guide groove formed in the rear seat receiver so that the backrest rotates backwards about a position appropriately distant above the rear seat receiver. A lower part of the support rod of the backrest part is fitted with a pin, and a curved second guide groove for holding and guiding a regulating pin of the lower part of the support rod of the backrest part is formed in the first guide groove. The second guide groove is bored at a lower position, the radius of curvature of the second guide groove is larger than the first guide groove, and the lower position of the second guide groove is lower than the first guide groove in the longitudinal direction. It was designed to look like it was separated from the rest of the world.

〔発明の作用・効果〕[Action/effect of the invention]

この構成により、着座者が背冗部に後向きの荷重（背も
たれ荷重）を掛けると、後座受体側に多くの体重が掛か
り、上向き付勢手段にて各々支持された前後両座受体の
うち後座受体の方がより大きく沈み込む。With this configuration, when a seated person applies a rearward load (backrest load) to the backrest part, a large amount of weight is applied to the rear seat receiver side, and both the front and rear seat receivers, which are each supported by the upward biasing means, Of these, the posterior receptor sinks more.

そして、前記後傾する後座受体に第１ガイド溝だけがあ
る場合には、背凭部用の支持杆下部におけるピンは何の
抵抗力もなく第１ガイド溝の他端側まで移動し、支持杆
は自由に後向きに回動できるが、位置固定的な支持枠体
に形成された第２ガイド溝を、その湾曲曲率半径が前記
第１ガイド溝より大きい曲率半径とし、且つ第２ガイド
溝の下部位置をその長平方向に行くに従って第１ガイド
溝より下方に離れるように形威しであるから、支持杆下
部におけるピンは後座受体の第１ガイド溝に沿って下向
きに移動する一方、支持杆下部における規制ピンが第２
ガイド溝に沿ってその下方に強制的に移動しようとする
。When there is only the first guide groove in the rearward tilting rear seat receiver, the pin at the lower part of the support rod for the backrest moves to the other end of the first guide groove without any resistance, The support rod can freely rotate backwards, but the second guide groove formed in the fixed position support frame has a radius of curvature larger than the first guide groove, and the second guide groove Since the lower position of the support rod is shaped so that it moves downwardly away from the first guide groove as it goes in the longitudinal direction, the pin at the lower part of the support rod moves downward along the first guide groove of the rear seat receiver. , the regulating pin at the bottom of the support rod is the second
It attempts to forcibly move downward along the guide groove.

その場合、ピンから規制ピンまでの距離に対応する第１
ガイド溝と第２ガイド溝との隔たりに合致する箇所まで
ピン及び規制ピンが滑り移動し、その位置に対応する角
度だけ支持杆が後傾できるのである。In that case, the first one corresponding to the distance from the pin to the regulation pin
The pin and the regulating pin slide to a position that matches the distance between the guide groove and the second guide groove, and the support rod can tilt backward by an angle corresponding to that position.

換言すれば、第２ガイド溝を、その湾曲曲率半径が前記
第１ガイド溝より大きい曲率半径とし、且つ第２ガイド
溝の下部位置をその長手方向に行くに従って第１ガイド
溝より下方に離れるように形成しであるから、後座受体
の後下向き傾動に応じて支持杆の後向き傾動角度が一義
的に決定されると共に、支持杆の傾動角度を後座受体の
傾動角度より大きくなるように設定することができるの
である。In other words, the second guide groove has a larger radius of curvature than the first guide groove, and the lower position of the second guide groove is further away from the first guide groove in the longitudinal direction. Therefore, the backward tilting angle of the support rod is uniquely determined according to the rearward downward tilting of the rear seat receiver, and the tilting angle of the support rod is made larger than the tilting angle of the rear seat receiver. It can be set to .

また、前記後座受体が下向き回動するとき、当該後座受
体は後下向きに引張り力を受ける〈前座受体から離れよ
うとする力が働＜）が、連結部材が屈曲するばかりでな
く、伸張可能であるので、規制ピンが第２ガイド溝に嵌
合した状態でその下方に滑り移動するときに規制ピンに
無理な力が掛かることがない。Furthermore, when the rear seat receiver rotates downward, the rear seat receiver receives a tensile force rearward and downward (force to move away from the front seat receiver), but the connecting member only bends. Since the regulating pin is expandable, no unreasonable force is applied to the regulating pin when the regulating pin is fitted into the second guide groove and slides downward.

このように、本発明に従えば、後座受体に腰部が位置し
て後傾させるとき、その後部の背λ部の回動角度が大き
過ぎたり、小さ過ぎるということもなく、人間工学的観
点に立った極めて座り心地の良い椅子を提供できるので
あり、且つその為の機構もあまり複雑でないという顕著
な効果を奏するのである。As described above, according to the present invention, when the lumbar region is positioned on the rear seat support and the lumbar region is tilted back, the rotation angle of the rear λ region is neither too large nor too small. This makes it possible to provide a chair that is extremely comfortable to sit on, and has the remarkable effect of not having a very complicated mechanism.

〔実施例〕〔Example〕

次に実施例について説明すると、符号１は椅子における
脚体の支柱Ａ上端に固着した横断面下向きコ字状の支持
枠体、符号２．３は前記支持枠体ｌの上方に配設する前
座受体と後座受体で、前後両座受体２．３ともその上面
には合成樹脂型等の弾性を有する薄板の座板４．５が取
付き、第１実施例では、前座受体２の後端と後座受体３
の前端との間の前後両座板４，５間を断面波形の薄板状
の連結部材６にて一体的に連接することにより、前座受
体２と後座受体３とに別々の大きさ及び方向の外力が作
用したとき、連結部材６が上下方向に屈曲可能となり、
且つ前後に伸縮可能となるように構成する。Next, an embodiment will be described. Reference numeral 1 denotes a support frame having a downward U-shaped cross section fixed to the upper end of the support column A of the leg of the chair, and reference numeral 2.3 denotes a front seat disposed above the support frame L. A seat plate 4.5 made of a thin elastic plate made of synthetic resin or the like is attached to the upper surface of both the front and rear seat receivers 2.3, and in the first embodiment, the front seat receiver 2 rear end and rear seat receiver 3
By integrally connecting the front and rear seat plates 4 and 5 between the front ends of the front and rear seat plates 4 and 5 with a thin plate-like connecting member 6 with a corrugated cross section, the front seat support 2 and the rear seat support 3 can be made to have different sizes. When an external force in the direction of and is applied, the connecting member 6 becomes bendable in the vertical direction,
In addition, it is configured to be able to expand and contract back and forth.

符号７は前記前後両座板４．５に跨って載置したクツシ
ランで、該クツシラン７の前後中途部下面は連結部材６
に直接接当しないように凹み部が形成されている。Reference numeral 7 denotes a shoelace placed astride both the front and rear seat plates 4.5, and the bottom surface of the shoelace 7 in the middle of the front and back is connected to a connecting member 6.
A recessed portion is formed so that it does not come into direct contact with.

符号８は前記支持枠体ｌと前後両座受体２，３とを昇降
自在に連結する側面視略Ｘ字状の左右−対のリンク機構
で、該リンク機構８における左右一対の後向きリンク９
の下端を支持枠体１の左右両側面板１ａ前部に各々軸ピ
ン１０にて回動自在に枢着し、各後向きリンク９の上端
の取付はピン１１は、後座受体３の側板３ａに穿設した
前後長手溝孔１２に摺動自在に嵌合している。Reference numeral 8 denotes a pair of left and right link mechanisms that are approximately X-shaped in side view and connect the support frame l and the front and rear seat receivers 2 and 3 in a vertically movable manner.
The lower ends of the support frame 1 are rotatably connected to the front parts of the left and right side plates 1a of the support frame 1 by shaft pins 10, and the pins 11 are used to attach the upper ends of each backward link 9 to the side plates 3a of the rear seat receiver 3. It is slidably fitted into front and rear longitudinal slots 12 bored in the.

リンク機構８における左右一対の前向きリンク１３の下
端は支持枠体１の左右両側面板１ａの前後中途部に回動
ピン１４にて回動自在に枢着する一方、前向きリンク１
３の上端の取付はピン１５を前座受体２の側面板後部の
前後長手溝孔１６に摺動自在に嵌合し、前向きリンク１
３゛から前向きに突出した枝アーム１３ａに横向きに突
出する副取付はピン１７を前座受体２の側面板前部の前
後長手溝孔１８に摺動自在に嵌合している。The lower ends of the pair of left and right forward-facing links 13 in the link mechanism 8 are rotatably pivoted to the front and rear midpoints of both the left and right side plates 1a of the support frame 1 by pivot pins 14.
3 is installed by slidingly fitting the pin 15 into the front and rear longitudinal slots 16 at the rear of the side plate of the front seat receiver 2, and then attaching the front link 1.
In the sub-mounting, which projects laterally on the branch arm 13a which projects forward from 3', a pin 17 is slidably fitted into a longitudinal longitudinal slot 18 in the front part of the side plate of the front seat receiver 2.

符号１９．２０は支持枠体１と前記前後両座受体２，３
間に各々装架して当該前後両座受体２゜３を各々独立的
に上向き付勢するコイルバネ等の付勢手段である。Reference numerals 19 and 20 refer to the support frame 1 and the front and rear seat receivers 2 and 3.
A biasing means such as a coil spring is installed between the two and biases the front and rear seat receivers 2.3 independently upwardly.

符号２１はクツション２２ａ付き背凭部２２の左右一対
の支持杆で、該支持杆２１の下部には上下に適宜隔てて
一対のピン２３．２４を横向きに突出させる一方、後座
受体３の左右両側面板３ａの後部には、当該後座受体３
の上方（Ｈｌ）の距離で且つ背凭部２２の前方（Ｌｌ）
の距離の箇所ＨＰを中心とする２本の円弧状の第１ガイ
ド溝２５．２６を穿設し、該第１ガイド溝２５．２６に
前記のピン２３．２４を各々摺動自在に嵌合させる。Reference numeral 21 denotes a pair of right and left support rods of the backrest portion 22 with a cushion 22a, and a pair of pins 23 and 24 project laterally from the lower part of the support rods 21 at an appropriate distance from each other vertically. At the rear of the left and right side plates 3a, there is a rear seat receiver 3.
At a distance above (Hl) and in front of the backrest 22 (Ll)
Two arc-shaped first guide grooves 25.26 are formed with the center at a point HP at a distance of let

なお、この円弧状第１ガイド溝２５．２６の中心点ＨＰ
を、着座穴のヒップポイント（椅子に着座した人の背中
面が１＆傾するときの人の腰部にある上半身の回転中心
をいう）に設定することもできる。Note that the center point HP of this arc-shaped first guide groove 25.26
can also be set at the hip point of the seating hole (the center of rotation of the upper body at the waist of the person when the back of the person sitting on the chair is tilted).

この場合、普通の身長・体格の人の場合のヒップポイン
トは、椅子を側面から見て、その座面から直角上方に略
１２０ｍ及び背凭面から直角前方向に略１２０關程度離
れた交点となる。In this case, when looking at the chair from the side, the hip point for a person of normal height and physique is approximately 120 m vertically upward from the seat and approximately 120 m vertically forward from the back surface. Become.

また、符号２７は支持枠体１の左右両側面板１ａに穿設
した側面視湾曲状（略円弧状または楕円弧状）の第２ガ
イド溝で、該第２ガイド溝２７には前記背凭部２２の支
持杆２１下部から横向きに突出させた規制ピン２８を係
合案内するように嵌合する。Further, reference numeral 27 denotes a second guide groove which is curved in side view (approximately circular arc shape or elliptical arc shape) and is bored in the left and right side plates 1a of the support frame 1. A regulating pin 28 protruding laterally from the lower part of the support rod 21 is fitted so as to be engaged and guided.

このときの第２ガイドｍ２１を前記第１ガイド溝２５．
２６より下方位置に穿設し、該第２ガイド溝２７の湾曲
曲率半径を前記第１ガイド溝２５゜２６より大きい曲率
半径とし、且つ第２ガイド溝２７の下部位置をその長手
方向に行くに従って第１ガイド溝２５．２６より下方に
離れるように形成するものである。At this time, the second guide m21 is connected to the first guide groove 25.
26, the radius of curvature of the second guide groove 27 is larger than that of the first guide groove 25. The first guide grooves 25 and 26 are formed so as to be separated downward from each other.

なお、支持杆２１と支持枠体ｌとの間に圧縮ばねまたは
ガススプリング（共に図示せず）を装架し、圧縮ばねの
場合はもたれ掛かる荷重に比例して長さが縮小すること
で、背凭部２２ひいては支持杆２１の後向きの抵抗力を
調節し、ガススプリングの場合は制御弁を自由状態にす
ることで背凭部２２ひいては支持杆２１の後向きの抵抗
力を調節するようにしても良い。In addition, a compression spring or a gas spring (both not shown) is installed between the support rod 21 and the support frame l, and in the case of a compression spring, the length is reduced in proportion to the load on which it is leaned. The rearward resistance force of the backrest part 22 and the support rod 21 is adjusted, and in the case of a gas spring, the rearward resistance force of the backrest part 22 and the support rod 21 is adjusted by setting the control valve to a free state. Also good.

この構成により、着座者が後座受体３側に多くの体重を
掛け、且つ背凭部２２に後向きの荷重（背もたれ荷重）
を掛けると、前後両座受体２．３に対する各々の上向き
付勢手段１９．２０の反力の差異により後座受体３の方
がより大きく沈み込む。With this configuration, the seated person puts a lot of weight on the rear seat support 3 side, and the backrest part 22 receives a rearward load (backrest load).
, the rear seat support 3 sinks more greatly due to the difference in the reaction force of the upward biasing means 19.20 on both the front and rear seat support 2.3.

その場合の後座受体３の回動中心は、連結部材６前端と
前座受体２後端との付は根部分近傍となると考えて良い
。In that case, the center of rotation of the rear seat receiver 3 may be considered to be near the root portion of the front end of the connecting member 6 and the rear end of the front seat receiver 2.

そして、前記第１ガイド溝２５．２６だけの場合には、
他に拘束するものがないから支持杆２１は完全に自由に
後向きに回動できるが、位置固定的な支持枠体１におけ
る第２ガイド′ａ２７を、その湾曲曲率半径が前記第１
ガイド溝２５．２６より大きい曲率半径とし、且つ第２
ガイド溝２７の下部位置をその長手方向に行くに従って
第１ガイド溝２５．２６より下方に離れるように形成し
であるから、支持杆２１下部におけるピン２３，２４は
後座受体３の第１ガイド溝２５．２６に沿って下向きに
移動する一方、規制ピン２８が第２ガイド溝２７に沿っ
てその下方に強制的に移動しようとする。In the case of only the first guide grooves 25 and 26,
Since there is no other constraint, the support rod 21 can rotate backwards completely freely, but the second guide 'a27 in the fixed support frame 1 is
The radius of curvature is larger than that of the guide grooves 25 and 26, and the second
Since the lower part of the guide groove 27 is formed to be further away from the first guide groove 25, 26 in the longitudinal direction, the pins 23 and 24 at the lower part of the support rod 21 are connected to the first guide groove 25, 26 of the rear seat receiver 3. While moving downward along the guide grooves 25 and 26, the regulating pin 28 attempts to forcibly move downward along the second guide groove 27.

その場合、ピン２３乃至ピン２４から規制ピン２８まで
の距離に対応する第１ガイド溝２５乃至２６と第２ガイ
ド溝２７との隔たりに合致する箇所まで各々のピン２３
．２４及び規制ピン２８が滑り移動し、その位置に対応
する角度だけ支持杆２１が後傾できるのである。In that case, each pin 23 is moved up to a point that matches the distance between the first guide grooves 25 and 26 and the second guide groove 27, which corresponds to the distance from the pins 23 and 24 to the regulating pin 28.
．． 24 and the regulating pin 28 slide, and the support rod 21 can tilt backward by an angle corresponding to the sliding movement.

換言すれば、第２ガイド溝２７を、その湾曲曲率半径が
前記第１ガイド溝２５．２６より大きい曲率半径とし、
且つ第２ガイド溝２７の下部位置をその長平方向に行く
に従って第１ガイド溝２５゜２６より下方に離れるよう
に形成しであるから、後座受体３の後下向き傾動に応じ
て支持杆２１の後向き傾動角度が一義的に決定されると
共に、支持杆２１の傾動角度を後座受体３の傾動角度よ
り大きくなるように設定することができるのである。In other words, the second guide groove 27 has a radius of curvature larger than that of the first guide groove 25.26,
In addition, since the lower position of the second guide groove 27 is formed so as to be further away from the first guide groove 25° 26 in the longitudinal direction, the support rod 21 is moved downwardly in response to the rearward downward tilting of the rear seat receiver 3. The backward tilting angle is uniquely determined, and the tilting angle of the support rod 21 can be set to be larger than the tilting angle of the rear seat receiver 3.

また、前記後座受体３が下向き回動するとき、当該後座
受体３は後下向きに引張り力を受ける（前座受体２から
離れようとする力が働＜）が、連結部材６が屈曲するば
かりでなく、伸張可能であるので、規制ピン２８が第２
ガイド溝２７に嵌合した状態でその下方に滑り移動する
ときに規制ピン２８に無理な力が掛かることがない。Further, when the rear seat receiver 3 rotates downward, the rear seat receiver 3 receives a tensile force rearward and downward (a force that tends to separate it from the front seat receiver 2 acts), but the connecting member 6 Since it is not only bendable but also extendable, the regulating pin 28 is
No unreasonable force is applied to the regulating pin 28 when it slides downward in the state of being fitted into the guide groove 27.

なお、この第２ガイド溝２７の形状を、前記後座受体３
のみ又は前座受体２と後座受体３とが一体的乃至平均値
として、単位角度（θ１〉だけ後下向きに回動するとき
、背凭部２２ひいては支持杆２１が前記角度（θ１）の
略２倍の角度（θ２〉だけ後向きに回動するように設定
すれば、背凭部２２にもたれ掛かるとき、座受体２，３
の後傾と背凭部２２の後傾とによる両者の傾動比率が常
時一定となるので、着座者の感じ方がよくなる。Note that the shape of the second guide groove 27 is similar to that of the rear seat receiver 3.
When the front seat support 2 and the rear seat support 3 rotate rearward and downward by a unit angle (θ1) either integrally or as an average value, the backrest 22 and the support rod 21 rotate at the angle (θ1). If it is set so that it rotates backward by approximately twice the angle (θ2>), when leaning against the backrest 22, the seat supports 2 and 3
Since the ratio of the backward tilting and the backward tilting of the backrest portion 22 is always constant, the feeling of the seated person is improved.

そして、前記第１ガイドｉ２５．２６の円弧の中心点Ｈ
Ｐをこのヒップポイントと略一致させると、第１図の一
点鎖線のように後座受体３が後傾しても、当該後座受体
３上に着座者の腰部が位置しているので、この後座受体
３の左右両側面板３ａに穿設した第１ガイド溝２５．２
６に沿って背凭部２２のための支持杆２１が回動するこ
とになり、従って、前記ヒップポイントを略中心として
椅子における背凭部が回動するときには、当該背凭部に
接する背中とのずれは全く生じないことになって、背凭
部２２にもたれるとき、着座者の上衣やワイシャツがめ
くれる等の不快感や不都合も無くなるのである。Then, the center point H of the arc of the first guide i25.26
If P is made approximately coincident with this hip point, even if the rear seat support 3 is tilted backwards as shown by the dashed line in FIG. 1, the seated person's waist will be located on the rear seat support 3. , a first guide groove 25.2 bored in the left and right side plates 3a of this rear seat receiver 3.
6, the support rod 21 for the backrest 22 rotates, and therefore, when the backrest of the chair rotates approximately around the hip point, the backrest in contact with the backrest 22 rotates along the This eliminates any discomfort or inconvenience caused by the seated person's jacket or dress shirt turning up when leaning against the backrest portion 22.

なお、前記第１ガイド溝は実施例のように二重にする必
要は必ずしもない。Note that the first guide groove does not necessarily have to be double as in the embodiment.

また、連結部材６′を屈曲可能且つ伸縮可能に構成する
手段としては、第４図に示すように弾性を有する（湾曲
可能な〉前座板４の後端部を上下二股状の嵌合部３０に
形成する一方、同じく弾性を有する（湾曲可能な）後座
板５の前端取付は部３１を前記嵌合部３０内に前後摺動
自在に嵌合させることで実現させても良いのである。Further, as a means for configuring the connecting member 6' to be bendable and expandable, as shown in FIG. On the other hand, the rear seat plate 5, which also has elasticity (can be bent), may be attached at the front end by fitting the portion 31 into the fitting portion 30 so as to be slidable back and forth.

さらに、第２図に示すように前座受体２側に着座者の体
重を大きく掛けると、背凭部２２の支持杆２１のピン２
３．２４が後座受体３の第１ガイド溝２５．２６の上端
に係止し、規制ピン２８が位置固定の支持枠体ｌにおけ
る第２ガイド溝２７の上端に係止して、それ以上後座受
体３及び背凭部２２が前向きに傾動しない一方、前記連
結部材６の箇所が屈曲可能であるため、後座受体３の前
端と連結部材６後端との付は根部分近傍を中心にして前
座受体２が前下向きに傾動できることになる（第２図二
点鎖線参照〉。Furthermore, as shown in FIG.
3.24 is engaged with the upper end of the first guide groove 25.26 of the rear seat receiver 3, and the regulating pin 28 is engaged with the upper end of the second guide groove 27 of the fixed support frame l, and As described above, while the rear seat receiver 3 and the backrest 22 do not tilt forward, the connecting member 6 can be bent, so that the front end of the rear seat receiver 3 and the rear end of the connecting member 6 are attached at the root. The front seat receiver 2 can be tilted forward and downward around the vicinity (see the two-dot chain line in Fig. 2).

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明の実施例を示し、第１図は椅子の要部側断
面図、第２図は椅子の前傾動状態を示す説明図、第３図
は第２図のＩＶ−ＩＶ視断面図、第４図は連結部材の他
の実施例の要部断面図である。 １・・・・支持枠体、２・・・・前座受体、３・・・・
後座受体、４・・・・前座板、５・・・・後座板、６，
６′・・・・連結部材、７，２２３・・・・クツション
、８−−−−リンク機構、９・・・・後向きリンク、１
ｏ・・・・軸ピン、１３・・・・前向きリンク、１１．
１５・・・・取付はピン、１２．１６・・・・長手溝孔
、Ｌ４００１０回動ピン、１７．・・・副取付はピン、
１８・・・・前後長手溝孔、１９．２０・・・・付勢手
段、２１・・・・支持杆、２２・・・・背凭部、２３．
２４・・・・ピン、２５．２６・・・・第１ガイド溝、
２７・・・・第２ガイド溝、２８・・・・規制ピン、３
０・・・・嵌合部、３１・・・・前端取付は部。The drawings show an embodiment of the present invention; FIG. 1 is a side sectional view of the main part of the chair, FIG. 2 is an explanatory diagram showing the forward tilting state of the chair, and FIG. 3 is a sectional view taken along line IV-IV in FIG. 2. , FIG. 4 is a sectional view of a main part of another embodiment of the connecting member. 1...Support frame body, 2...Front seat receiver, 3...
Rear seat receptor, 4...Front seat plate, 5...Rear seat plate, 6,
6'...Connection member, 7,223...Cushion, 8----link mechanism, 9...Rearward link, 1
o... Axis pin, 13... Forward link, 11.
15...Mounting with pin, 12.16...Longitudinal slot, L40010 rotation pin, 17. ... Sub-mounting is a pin,
18... Front and rear longitudinal slots, 19. 20... Biasing means, 21... Support rod, 22... Backrest portion, 23.
24... Pin, 25.26... First guide groove,
27...Second guide groove, 28...Regulation pin, 3
0...Mating part, 31...Front end mounting part.

Claims (1)

【特許請求の範囲】[Claims] （１）、脚体上部の支持枠体に対して上向き付勢手段及
びリンク機構を介して昇降動自在に支持した前座受体と
後座受体とを屈曲及び伸縮可能な連結部材にて連結し、
後座受体上方に適宜離れた位置を中心に背凭部が後向き
回動するように、後座受体に形成した円弧状の第１ガイ
ド溝に背凭部の支持杆下部をピン嵌合し、前記支持枠体
には、前記背凭部の支持杆下部の規制ピンを係合案内す
るための湾曲状の第２ガイド溝を前記第１ガイド溝より
下方位置に穿設し、該第２ガイド溝の湾曲曲率半径を前
記第１ガイド溝より大きい曲率半径とし、且つ第２ガイ
ド溝の下部位置をその長手方向に行くに従って第１ガイ
ド溝より下方に離れるように形成したことを特徴とする
椅子の傾動装置。(1) The front seat receiver and the rear seat receiver, which are supported so as to be movable up and down through an upward biasing means and a link mechanism, are connected to the support frame of the upper part of the leg by a connecting member that can be bent and expanded. death,
The lower part of the support rod of the backrest part is fitted with a pin into the arc-shaped first guide groove formed in the rear seat receiver so that the backrest part rotates backwards around a position appropriately distant above the rear seat receiver. A curved second guide groove for engaging and guiding a regulating pin at a lower part of the support rod of the backrest is bored in the support frame at a position lower than the first guide groove, and The second guide groove has a radius of curvature larger than that of the first guide groove, and the lower position of the second guide groove is formed to be further away from the first guide groove in the longitudinal direction. Chair tilting device.