JPH0779742B2 - Chair tilting device - Google Patents

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。TECHNICAL FIELD The present invention relates to the structure of an apparatus for tilting a seat body and a backrest of a chair rearward.

〔従来の技術と発明が解決しようとする課題〕[Problems to be Solved by Conventional Techniques and Inventions]

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。Conventionally, there are various means for constructing a seat plate of a chair and a backrest portion mounted so as to stand upright from the rear portion thereof so as to be tilted rearward in association with each other according to the degree of backrest of a seated person. Has been invented.

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Ｌ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。Further, in JP-A-58-127617, when the seat plate and the backrest are integrally tilted, the upper end of the leg body is used as a means for eliminating unsightly appearance such as the upper garment that is in contact with the backrest being turned over. The front end of the L-shaped backrest frame in a side view is axially attached to the rear portion of the box-shaped fixing frame fixed to the rear end of the box-shaped fixing frame and the rear end of the underframe on which the seat plate is placed. A shaft is attached, and a horizontal shaft pivotally supported on the front part of the underframe is inserted into a substantially horizontal long groove at the front end of the fixed frame,
A configuration is disclosed in which the rear end of the gas spring is pivotally attached to the fixed frame and the front end is pivotally attached to the horizontal axis.

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 the free state and a rearward force is applied to the backrest frame, the backrest frame is pivoted rearward about the pivot point between the backrest frame and the fixed frame, and the underframe to which the seat plate is attached is rearwardly oriented. While pulling on, tilt the rear end downward. At this time, the underframe rotates downward around the horizontal axis portion at the front end.

ところで、座板に着座した人の背中面が後傾するとき、
人の腰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120mm程度離れた交点となる。By the way, when the back of a person who sits on a seat tilts backward,
The back surface moves around the hip point, which is the center of rotation of the upper body of the person's waist. And the hip point for people of normal height and physique is to look at the chair from the side,
The intersection is approximately 120 mm above the seat surface and approximately 120 mm away from the backrest surface in the front direction at a right angle.

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 portion of the chair rotates about the hip point, there is no deviation from the back in contact with the backrest portion.

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離れているこ
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、反対に背凭枠
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 above-mentioned prior art, when the backrest frame tilts backward, the backrest frame rotates around the pivot point between the bent portion of the backrest frame and the rear end of the underframe of the seat plate. Since this pivoting point moves considerably away from the hip point, if the pivot angle of the backrest frame at the pivoting point is small, it will feel like pushing the back up, and on the contrary. If the rotation angle of the backrest frame is too large, the user feels like dragging his / her back downward, causing a large relative displacement at the contact point 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 plate tilts rearward and downward, the angle of the backrest that tilts backwards in conjunction with that is that the ratio of the tilt angle of the backrest part to 2 is 1 to the tilt angle of the seat plate. It is said to be engineeringly preferable. This is because when the backrest frame has a smaller rotation angle than the rearward tilting angle of the seat plate, the backrest frame has a feeling of pushing the back forward, and conversely, when the backrest frame has a too large rotation angle. This is because the box frame causes the user to feel that it is separated 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 portion when the rear downward angle of the seat plate is small and the ratio of the rotation angle of the backrest portion when the rear downward angle is large varies,
It's a more uncomfortable chair.

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機構
を簡単に実現することが困難であった。Then, a mechanism is set so that the seated person's back is not displaced with respect to the backrest portion, and the backward inclination angle of the seat plate and the inclination angle of the backrest portion are always in a predetermined ratio. It was difficult to realize easily.

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 is intended to solve such conventional problems.

〔課題を解決するための手段〕[Means for Solving the Problems]

この目的を達成するため本発明は、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
形成したものである。In order to achieve this object, the present invention is capable of bending and expanding and contracting a front seat receiving member and a rear seat receiving member that are supported so as to be able to move up and down with respect to a support frame on the upper part of a leg through upward biasing means and a link mechanism. The backrest portion is formed in the arc-shaped first guide groove formed in the rear seat receiver so that the backrest portion rotates rearward around a position appropriately separated above the rear seat receiver. A lower part of the support rod is fitted with a pin, and a curved second guide groove for engaging and guiding the restriction pin of the lower support rod of the backrest part is provided on the support frame below the first guide groove. 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 separated from the first guide groove in the longitudinal direction. It is formed as follows.

〔発明の作用・効果〕[Operation and effect of invention]

この構成により、着座者が背凭部に後向きの荷重（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) on the backrest, a large amount of weight is applied to the rear seat receiver side, and the front and rear seat receivers supported by the upward biasing means respectively. Of these, the rear seat receiver 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てあるから、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 the rear seat support that tilts backward has only the first guide groove, the pin in the lower part of the support rod for the backrest moves to the other end of the first guide groove without any resistance, Although the support rod can freely rotate rearward, the second guide groove formed in the positionally fixed support frame has a curvature radius larger than that of the first guide groove, and the second guide groove. Since the lower part of the support rod is formed so as to be separated downward from the first guide groove as it goes in the longitudinal direction, the pin in the lower part of the support rod moves downward along the first guide groove of the rear seat receiver, The regulation pin at the bottom of the support rod is the second
It tries to 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 corresponding to the distance from the pin to the regulation pin
The pin and the regulation pin slide and move to a position corresponding to the distance between the guide groove and the second guide groove, and the support rod can be tilted backward by an angle corresponding to the 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てあるから、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 radius of curvature of the second guide groove is larger than the radius of curvature of the first guide groove, and the lower position of the second guide groove is separated downward from the first guide groove as it goes in the longitudinal direction. Therefore, the rearward tilt angle of the support rod is uniquely determined according to the rearward downward tilt of the rear seat receiver, and the tilt angle of the support rod is set to be larger than the tilt angle of the rear seat receiver. 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
うとする力が働く）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。Further, when the rear seat receiver rotates downward, the rear seat receiver receives a pulling force rearward and downward (a force to separate from the front seat receiver works), but not only the connecting member bends. Since it is extensible, an unreasonable force is not applied to the regulation pin when the regulation pin is slid and moved downward while being fitted in the second guide groove.

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、その後部の背凭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 portion is positioned on the rear seat receiver and tilted backward, the rotation angle of the backrest portion of the rear portion is not too large or too small, and ergonomic It is possible to provide a chair that is extremely comfortable from the viewpoint, and has the remarkable effect that the mechanism therefor is not so complicated.

〔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１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
合成樹脂製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 is a supporting frame body having a downward U-shaped cross section fixed to the upper end of a pillar A of a leg of a chair, and reference numerals 2 and 3 are front seats arranged above the supporting frame body 1. With the receiving body and the rear seat receiving body, both front and rear seat receiving bodies 2 and 3 are attached with thin seat plates 4 and 5 having elasticity such as synthetic resin on their upper surfaces,
In the first embodiment, the front and rear seat plates 4 and 5 between the rear end of the front seat receiver 2 and the front end of the rear seat receiver 3 are integrally connected by a thin plate-shaped connecting member 6 having a corrugated cross section. Thus, when external forces of different sizes and directions act on the front seat receiving body 2 and the rear seat receiving body 3, the connecting member 6 can be bent in the vertical direction and can be expanded and contracted 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ッショ
ンで、該クッション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 is a cushion that is placed across the front and rear seat plates 4 and 5, and the lower surface of the front and rear midway portion of the cushion 7 is formed with a recess so as not to directly contact the connecting member 6.

符号８は前記支持枠体１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字状の左右一対のリンク機構
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
付けピン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 substantially X-shaped in a side view and vertically connect the support frame 1 and the front and rear seat receiving bodies 2 and 3, and a pair of left and right rearward facing links 9 in the link mechanism 8.
The lower end of each of the left and right side plates 1a of the support frame 1 is attached to the front part of the shaft pin, respectively.
A mounting pin 11 is rotatably pivoted at 10, and a mounting pin 11 at the upper end of each rearward facing link 9 is slidably fitted in a longitudinal longitudinal groove 12 formed in a side plate 3a of the rear seat receiving member 3. .

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13の上端
の取付けピン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13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けピン1
7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 front links 13 in the link mechanism 8 are pivoting pins at the front and rear midway portions of the left and right side plates 1a of the support frame 1.
While being pivotally pivoted at 14, the mounting pin 15 at the upper end of the forward link 13 is slidably fitted in the longitudinal longitudinal slot 16 at the rear portion of the side plate of the front seat receiving body 2 to move forward from the forward link 13. Sub-mounting pin 1 that projects laterally to the branch arm 13a that projects to the side
7 is slidably fitted into the front and rear longitudinal slots 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。Numerals 19 and 20 are urging means such as coil springs which are mounted between the support frame 1 and the front and rear seat receivers 2 and 3 to urge the front and rear seat receivers 2 and 3 independently upward. Is.

符号21はクッション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（H1）の
距離で且つ背凭部22の前方（L1）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 left and right support rods of the backrest portion 22 with a cushion 22a. A pair of pins 23 and 24 are laterally protruded from the lower portion of the support rod 21 at appropriate intervals while the rear seat receiver 3 of the rear seat receiver 3 is provided. At the rear of the left and right side plates 3a, two arc-shaped first arcs centered on a point HP at a distance (H1) above the rear seat receiving body 3 and at a distance (L1) in front of the backrest 22 are provided. Guide grooves 25 and 26 are provided, and the pins 23 and 24 are slidably fitted in the first guide grooves 25 and 26, respectively.

なお、この円弧状第１ガイド溝25,26の中心点HPを、着
座人のヒップポイント（椅子に着座した人の背中面が後
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。The center point HP of the arc-shaped first guide grooves 25, 26 is the hip point of the seated person (refers to the center of rotation of the upper body on the waist of the person when the back surface of the person sitting on the chair leans backward).
It can also be set to.

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
120mm及び背凭面から直角前方向に略120mm程度離れた交
点となる。In this case, the hip point for a person of normal height and physique is approximately right above the seat when the chair is viewed from the side.
It is an intersection of 120 mm and about 120 mm away from the back surface in the front direction at a right angle.

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。Reference numeral 27 denotes a second guide groove formed in the left and right side plates 1a of the support frame 1 and having a curved shape in a side view (substantially arcuate shape or elliptic arc shape), and the second guide groove 27 has the backrest 22. The control pin (28) laterally projected 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ガイド溝27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 groove 27 is formed at a position lower than the first guide grooves 25 and 26, and the curvature radius of curvature of the second guide groove 27 is set to be larger than the first guide grooves 25 and 26. In addition, the lower portion of the second guide groove 27 is formed so as to be separated downward from the first guide grooves 25 and 26 as it goes in the longitudinal direction.

なお、支持杆21と支持枠体１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, by mounting a compression spring or a gas spring (both not shown) between the support rod 21 and the support frame 1, and in the case of a compression spring, the length is reduced in proportion to the leaning load, Adjust the rearward resistance of the backrest 22 and thus the support rod 21, and in the case of a gas spring, open the control valve to adjust the rearward resistance of the backrest 22 and then the support rod 21. Is 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, when a seated person puts a large amount of weight on the rear seat receiving body 3 side and applies a rearward load (backrest load) to the backrest portion 22, each of the front and rear seat receiving bodies 2 and 3 is attached upward. Due to the difference in reaction force between the biasing means 19 and 20, the rear seat receiving body 3 sinks more.

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後端との付け根部分近傍となると考えて良
い。In that case, it may be considered that the rotation center of the rear seat receiving body 3 is in the vicinity of the root portion between the front end of the connecting member 6 and the rear end of the front seat receiving body 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
ガイド溝27を、その湾曲曲率半径が前記第１ガイド溝2
5,26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25,2
6より下方に離れるように形成してあるから、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 restraint, the support rod 21 can be completely freely rotated rearward, but the second position in the fixed support frame 1 is fixed.
The guide groove 27 has a curvature radius of the first guide groove 2
The radius of curvature is larger than 5,26, and the lower portion of the second guide groove 27 is moved in the longitudinal direction of the first guide groove 25,2.
The support rod 21
The pins 23, 24 in the lower part are the first guide grooves 25,
While moving downward along 26, the regulating pin 28 tries to forcefully 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 of the pins 23, 24 and the regulation pin 28 reaches a position corresponding to the distance between the first guide grooves 25 to 26 and the second guide groove 27 corresponding to the distance from the pins 23 to 24 to the regulation pin 28. It slides and moves at an angle corresponding to its position.
21 can lean backwards.

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てあ
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 radius of curvature of the second guide groove 27 is larger than the radius of curvature of the first guide grooves 25, 26, and the lower position of the second guide groove 27 becomes longer in the longitudinal direction. Since they are formed so as to be separated downward from 25 and 26, the rearward tilting angle of the supporting rod 21 is uniquely determined according to the rearward downward tilting of the rear seat receiving body 3, and the supporting rod 21
The tilting angle can be set to be larger than the tilting angle of the rear seat receiving body 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く）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 receiving body 3 rotates downward, the rear seat receiving body 3 receives a pulling force rearward and downward (a force to separate from the front seat receiving body 2 works), but the connecting member 6 bends. In addition, since the restriction pin 28 can be expanded, the restriction pin 28 does not exert an excessive force when the restriction pin 28 is slidably moved downward in the state of being fitted in the second 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。In addition, the shape of the second guide groove 27 is rotated downward by a unit angle (θ1) with only the rear seat receiving member 3 or the front seat receiving member 2 and the rear seat receiving member 3 as an integral or average value. and when,
If the backrest 22 and thus the support rod 21 are set so as to rotate rearward by an angle (θ2) that is approximately twice the angle (θ1), when the backrest 22 leans against the seat support 2,3. Since the tilting ratios of the two due to the rearward tilting and the rearward tilting of the backrest portion 22 are always constant, the seated person feels better.

そして、前記第１ガイド溝25,26の円弧の中心点HP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25,26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。When the center point HP of the arc of the first guide grooves 25, 26 is made to substantially coincide with this hip point, even if the rear seat receiving body 3 is tilted backward as shown by the alternate long and short dash line in FIG. Since the waist of the seated person is located on the receiving body 3, the support rod for the backrest 22 is provided along the first guide grooves 25 and 26 formed in the left and right side plates 3a of the rear seat receiving body 3. Therefore, when the backrest portion of the chair rotates about the hip point, the gap with the back in contact with the backrest portion does not occur at all, and the backrest is rotated. When leaning against the portion 22, the discomfort and inconvenience of the seated person's jacket or shirt turning over is eliminated.

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。The first guide groove does not necessarily have to be doubled 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の前端取付け部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 making the connecting member 6'bendable and extendable, as shown in FIG. 4, the rear end portion of the front seat plate 4 having elasticity (bendable) is fitted with an upper and lower bifurcated fitting portion 30. On the other hand, the front end mounting portion 31 of the rear seat plate 5 which is also elastic (bendable) may be fitted in 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23,24
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１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
との付け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）。Further, as shown in FIG. 2, when the weight of the seated person is heavily applied to the front seat receiving body 2 side, the pins 23, 24 of the supporting rod 21 of the backrest portion 22 are
Is locked to the upper ends of the first guide grooves 25 and 26 of the rear seat receiving member 3, and the regulating pin 28 is fixed in position to the second guide groove of the supporting frame 1.
It is locked to the upper end of 27, and the rear seat receiver 3 and backrest 22
Does not tilt forward, but since the location of the connecting member 6 is bendable, the front seat receiving body 2 moves forward and downward around the root of the front end of the rear seat receiving body 3 and the rear end of the connecting member 6. It is possible to tilt (see the chain double-dashed line in Fig. 2).

【図面の簡単な説明】[Brief description 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、7,22a
……クッション、８……リンク機構、９……後向きリン
ク、10……軸ピン、13……前向きリンク、11,15……取
付けピン、12,16……長手溝孔、14……回動ピン、17…
…副取付けピン、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、2
5,26……第１ガイド溝、27……第２ガイド溝、28……規
制ピン、30……嵌合部、31……前端取付け部。The drawings show an embodiment of the present invention, FIG. 1 is a side sectional view of a main part of a chair, FIG. 2 is an explanatory view showing a front tilted state of the chair, and FIG. 3 is a sectional view taken along line IV-IV of FIG. FIG. 4 is a cross-sectional view of an essential part of another embodiment of the connecting member. 1 ... Support frame, 2 ... Front seat receiver, 3 ... Rear seat receiver, 4
...... Front seat plate, 5 …… Rear seat plate, 6,6 ′ …… Coupling member, 7,22a
…… Cushion, 8 …… Link mechanism, 9 …… Backward link, 10 …… Axial pin, 13 …… Frontward link, 11,15 …… Mounting pin, 12,16 …… Longitudinal slot, 14 …… Rotation Pin, 17 ...
… Sub-mounting pin, 18 …… longitudinal longitudinal slot, 19,20 …… biasing means, 21 …… supporting rod, 22 …… back support, 23,24 …… pin, 2
5,26 …… First guide groove, 27 …… Second guide groove, 28 …… Regulation pin, 30 …… Fit part, 31 …… Front end mounting part.

Claims (1)

【特許請求の範囲】[Claims] 【請求項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. A front and rear seat receiving member, which is supported by an upward biasing means and a link mechanism so as to be movable up and down with respect to a support frame on an upper part of a leg, by a connecting member which is bendable and expandable. An arc-shaped first portion formed on the rear seat receiver so that the backrest rotates rearward around a position appropriately separated above the rear seat receiver.
The lower part of the support rod of the backrest part is pin-fitted to the guide groove, and the support frame has a curved second guide groove for engaging and guiding the regulation pin of the lower part of the support rod of the backrest part. The second guide groove is formed below the first guide groove, and the radius of curvature of the second guide groove is larger than that of the first guide groove.
The lower part of the guide groove becomes first as it goes in the longitudinal direction.
A chair tilting device, characterized in that it is formed so as to be separated downward from the guide groove.