JP4411413B2

JP4411413B2 - Chair

Info

Publication number: JP4411413B2
Application number: JP2001083882A
Authority: JP
Inventors: 裕太郎八塚; 彰清水; 正春小泉; 正大阿久津
Original assignee: TAMAGAWA ACADEMY & UNIVERSITY; Kokuyo Co Ltd
Current assignee: TAMAGAWA ACADEMY & UNIVERSITY; Kokuyo Co Ltd
Priority date: 2001-03-22
Filing date: 2001-03-22
Publication date: 2010-02-10
Anticipated expiration: 2021-03-22
Also published as: JP2002282081A

Description

【０００１】
【発明の属する技術分野】
本発明は、学校等で主に生徒用として好適に利用される椅子に関するものである。
【０００２】
【従来の技術】
この種の生徒用の椅子において、特に、小学校で利用されるものの場合には、低学年〜高学年の間で体格差が顕著なため、着座者の体格に応じて座の高さ調整ができるとともに、これに合わせて背もたれの位置を前後方向に調整することができるタイプが利用されることが多い。
【０００３】
このような椅子の従来の具体的な構成としては、背もたれと座とを別々に調整するものや、螺子送り運動等の回転運動により座の昇降動作を行い、これと連動させて背もたれの前後位置を調整することによって、着座者の体格に合わせて座及び背もたれの位置を着座者の体格にフィットするような適正位置に合わせることができるもの等がある。
【０００４】
また、前述したような背もたれの位置を調整するものと同様に、座の昇降動作と連動させて着座者の足を保持する足置きをその体格に合わせた適正位置に調整するものも要望されている。
【０００５】
【発明が解決しようとする課題】
ところで、近年、小学校でもパソコンを使用して行う授業等が導入されており、パソコン作業を行うための机と椅子の開発が行われている。また、生徒の体格を調査した結果から、膝下から足にかけての膝下長さ及び膝上から臀部にかけての膝上長さは、成長による体格の変化とともに、最も著しく変化することが明らかになっている。一方、前述したようなパソコン作業を行う場合には、腕を略直角に保持した姿勢で、キーボードやマウスの操作を行うものであり、天板面に対する座の位置変化は、体格の違いによってそれ程大きくないことも前記調査で明らかになっている。そのため、体格の異なる着座者が、同じ机と椅子を利用してパソコン作業等を行う場合に適正な姿勢を保持するためには、体格の違いによって変化が大きい膝下長さ及び膝上長さに対応させて、足置きの上下高さ位置及び背もたれの前後位置を利用者の体格に合わせて適正に調整することが最も望ましいと考えられる。
【０００６】
このような考えに鑑み、本発明は、着座者の体格が変化した場合にも、パソコン作業等を行うための適正な姿勢を保持し得るような椅子を提供することを目的としている。
【０００７】
【課題を解決するための手段】
上記の問題点を解決するために、本発明は、座と、背もたれと、足を置くための足置きと、これらを支持してなる脚体とを少なくとも具備してなる椅子において、前記背もたれが、背もたれ本体と、この背もたれ本体と支持する背支桿とを具備してなり、前記背支桿の上端部に前記背もたれ本体を取り付けるとともに、下端部が前記背もたれを正逆方向に回転可能に支持する第１の回転支持部を介して前記脚体に取り付けられており、前記座を上下方向に移動させる座昇降動作と、前記背もたれを前後方向に移動させる動作と、前記足置きを上下方向に移動させる動作とを連続的に連動させるようにしている。
【０００８】
このような構成のものであると、座、背もたれ及び足置きのうちの何れか一つの位置を変えれば、それに合わせて他の２つの位置も連動して変化することになり、一回の操作で座、背もたれ及び足置きを適正な位置に移動させることが可能となる。例えば、小学校低学年の場合には、座が上方へ移動する動作と、足置きが上方へ移動する動作と、背もたれが前方へ移動する動作とを連動させて行うようにすれば、パソコンやキーボードを置いた天板面に腕を略直角に曲げた状態で、座を中心にして足置きと背もたれとが互いに近付く方向、すなわち背もたれによって利用者の背を、足置きによって利用者の足を良好に支持する位置へ連動させ得ることになる。同様にして、体格の大きい小学校高学年の場合には、座が下方へ移動する動作と、足置きが下方へ移動する動作と、背もたれが後方へ移動する動作とを連動させて行うようにすれば、パソコンやキーボードを置いた天板面に腕を略直角に曲げた状態で、座を中心にして足置きと背もたれとが互いに離間する方向、すなわち背もたれによって利用者の背を、足置きによって利用者の足を良好に支持する位置へ連動して移動することになる。したがって、利用者は、背と足を椅子により適正に保持した状態で作業を行うことが可能となり、例えば、長期間パソコン作業を行っても、疲労感を感じにくく、また、姿勢を良好に保って視力低下等を招く恐れを有効に回避することが可能となる。
【０００９】
好適な実施の形態としては、座を上下方向に移動し得る座昇降機構を具備してなり、前記連動装置が、前記座昇降機構と協働して座の移動動作を前記背もたれ及び足置きの移動動作と連続的に連動させるものが挙げられる。また、前記第１の回転支持部が、前記座を上下方向に移動させても回転中心が上下に移動不能な前記脚体の脚支柱に固定されたものである。
【００１０】
連動する背もたれと足置きの位置決定のし易さを図るには、連動装置が、前記座を上昇させた場合に、前記背もたれ及び足置きを前記座と近づく方向に移動させ、前記座を下降させた場合に、前記背もたれ及び足置きを前記座と離れる方向へ移動させることで、座を基準にして背もたれ及び足置きの位置を決定するものであることが望ましい。
【００１１】
ワンタッチ操作で座、背もたれ及び足置きの位置調整を行うことを可能にするには、座昇降機構が、ガススプリングであることが望ましい。
【００１２】
好適な実施の形態としては、天板面を一定高さ位置に固定したテーブルや机等の天板付き家具とともに使用され、前記天板面上での執務作業に適するように前記座の高さ位置を設定するものであることが望ましい。
【００１３】
前述した作動を行い得るものを、部材を可及的に少なくして簡素な構造で実現するには、本発明にかかる椅子は、連動装置が、背もたれを軸部を用いて正逆方向に回転可能に支持する第１の回転支持部と、一端側を前記第１の回転支持部から変位した背もたれの一部に軸部を用いて正逆方向に回転可能に取り付け、他端側を前記座昇降機構により上下方向に移動可能に支持された座側又は足置き側の一部に軸部を用いて正逆方向に回転可能に取り付けた第１のリンク部材と、足置きを軸部を用いて正逆方向に回転可能に支持する第２の回転支持部と、一端側を前記第２の回転支持部から変位した足置きの一部に軸部を用いて正逆方向に回転可能に取り付け、他端側を前記座昇降機構により上下方向に移動可能に支持された座側の一部に軸部を用いて正逆方向に回転可能に取り付けた第２のリンク部材とを具備してなることを特徴とする。
【００１４】
さらに部品点数を削減して構造の簡素化を図るには、第１の回転支持部が、足置きの基端部側を正逆方向に回転可能に支持する前記第２の回転支持部を兼ねていることが望ましい。
【００１５】
【発明の実施の形態】
以下、本発明の一実施の形態について図面を参照して説明する。
【００１６】
本実施の形態の椅子Ａは、主として学校等で生徒用の椅子として利用されるものであり、図１に示すように、座２と背もたれ３と足置きたる足置き部４とを具備してなる椅子本体１と、この椅子本体１を支持してなる脚体５とを具備してなる。そして、この椅子Ａは、天板面が一定高さ位置にあるテーブルや机等の天板付き家具（図示せず）とともに使用され、特に前記天板付き家具の天板上にパソコン等のOA装置を置いて執務作業を行うべく利用されるものである。
【００１７】
以下、この椅子Ａの具体的な構成について説明する。
【００１８】
座２は、図１〜図３に示すように、薄板状のもので、その下面に設けた座受部材２１を前記脚体５の上端部側に座昇降機構たるガススプリング６を介して上下動可能に支持されている。
【００１９】
背もたれ３は、平面視略矩形状の薄板部材で形成された背もたれ本体３１と、前記背もたれ本体３１を支持する背支桿３２とを具備している。この背支桿３２は、下半部３２１と、この下半部３２１に対して屈曲している上半部３２２とから構成される側面視略逆くの字形状のものである。そして、その上端部３２ａに前記背もたれ本体３１を当該背支桿３２に対して角度調整可能となるように取り付けている。
【００２０】
足置き部４は、前記座２の下方に位置するものであり、平面視略ロ字形状をなすように屈曲させた丸パイプ部材により構成されている。具体的には、この足置き部４は、丸パイプ部材を後方側が一部開口するように平面視略ロ字形に屈曲させたものであるが、その左右両端部４ａに、溶接する等して連結した前後方向に延びる薄板状の連結部材４１を有している。具体的には、この連結部材４１の略中央部には、前記足置き部４の左右両端部４ａが連結してある。
【００２１】
脚体５は、例えば、キャスタＣにより移動可能に支持されている５本の脚羽根５１と、これら脚羽根５１の中央部から上方へ突出した脚支柱５２とを具備してなる。この脚支柱５２の上端部には、前記ガススプリング６が設けてあり、このガススプリング６の上方に前記座２を支持する座受部材２１を適宜の手段で上下動可能に支持させている。
【００２２】
ガススプリング６は、上端部近傍側に設けた作動端６１を操作レバーBにより押圧している際にだけ、図示しない弁が開閉して突没軸たるロッド６２が突没動作を行う周知のものである。具体的に説明すると、座２の位置を調整する場合には、先ず、操作レバーＢによりガススプリング６の作動端６１を押圧し、ロッド６２が突没動作を行うようにする。その状態で着座者が座２にかける荷重を増加させると座２は下降し、逆に座２にかける荷重を減少させると座２は上昇する。
【００２３】
このような構成のものにおいて、本実施の形態では、前記背もたれ３を前後方向に移動させる動作と、前記足置き部４を上下方向に移動させる動作とを連続的に連動させる連動装置たる位置調整機構７を具備してなる。この位置調整機構７は、前記ガススプリング６と協働して座２の移動動作を前記背もたれ３及び足置き部４の移動動作と連続的に連動させるものであり、本実施の形態では、座２を上昇させた場合に、背もたれ３及び足置き部４を前記座２と近付く方向に移動させ、座２を下降させた場合に、背もたれ３及び足置き部４を前記座２と離れる方向へ移動させるものである。すなわち、パソコン作業等の天板上での執務作業に適するように座２の高さ位置を設定すると、その位置に合わせて位置調整機構７が、座２と足置き部４の間隔が着座者の膝下長さに略合致し、座２と背もたれ３の間隔が膝上長さに略合致した最適位置となるように、足置き部４の上下高さ位置及び背もたれ３の前後位置を調整するものである。
【００２４】
位置調整機構７は、図４に示すように、背支桿３２の基端部たる下端部３２ｂ側及び足置き部４の基端部たる連結部材４１の後端部４１ａ側を正逆方向に回転可能に支持する回転支持部７１と、一端たる後端部７２ｂ側を前記回転支持部７１から変位した位置にある背支桿３２の一部に正逆方向に回転可能に取り付け、他端たる前端部７２ａ側をガススプリング６のロッド６２に正逆方向に回転可能に取り付けた第１のリンク部材たる第１リンクメンバ７２と、一端たる下端部７３ｂ側を前記回転支持部７１から変位した位置にある足置き部４の連結部材４１に正逆方向に回転可能に取り付け、他端たる上端部７３ａ側をガススプリング６のロッド６２に正逆方向に回転可能に取り付けた第２のリンク部材たる第２リンクメンバ７３とを具備してなる。
【００２５】
回転支持部７１は、前記背支桿３２の下端部３２ｂに軸心方向を水平方向と略一致させて設けた軸挿通孔３２１と、前記足置き４の連結部材４１の後端部４１ａ側に設けた軸挿通孔４１１と、これら軸挿通孔３２１、４１１に挿通して前記背支桿３２と足置き部４を正逆方向に回転可能に支持する軸部ｐとから構成される。この回転支持部７１は、脚５に固定された固定アームｋにより椅子本体１に対して固定されている。この軸部ｐは、その軸心を略水平方向に一致させている。
【００２６】
第１リンクメンバ７２は、薄板状のもので、前後方向に延出するように設けてある。そして、その前後端部７２ａ、７２ｂ側に前後挿通孔７２１、７２２を有している。
【００２７】
第２リンクメンバ７３は、薄板状のもので、上下方向に延出するように設けてある。そして、その上下端部７３ａ、７３ｂ側に上下挿通孔７３１、７３２を有している。
【００２８】
そして、前記第１リンクメンバ７２と前記第２リンクメンバ７３は、その前端部７２ａ側と上端部７３ａ側を、軸ｑを介してガススプリング６のロッド６２の上端部側に正逆方向に回転可能に取り付けられている。具体的には、前記ロッド６２の上端部に軸心を略水平方向に一致させて設けた略円筒状の軸受部６２１が設けてあり、この軸受部６２１に支持される軸ｑに、第１リンクメンバ７２の前挿通孔７２１と、第２リンクメンバ７３の上挿通孔７３１を挿通することにより、前記第１、第２リンクメンバ７２、７３を正逆方向に回転可能に支持させている。
【００２９】
一方、前記第１リンクメンバ７２は、前記後挿通孔７２２に、前記背支桿３２に設けた軸受部３２３に保持させた軸部ｒを挿通することにより前記後端部７２ｂ側を背支桿３２に正逆方向に回転可能に取り付けられている。前記軸受部３２３は、前記背支桿３２の下半部３２１の上下方向略中央位置の前面側に略水平方向に軸心を一致させて設けた略円筒状のものである。
【００３０】
また、前記第２リンクメンバ７３は、前記下挿通孔７３２に前記足置き部４の連結部材４１の前端部４１ｂ側に設けた前挿通孔４１２から挿通した軸部ｓを挿通することにより、前記足置き部４に対して正逆方向に回転可能に取り付けられている。
【００３１】
なお、本実施の形態では、第１リンクメンバ７２の後端部７２ｂ側を背支桿３２に取り付ける位置を、この後端部７２ｂ側が前記前端部７２ａ側よりも後方且つ下方位置で支持されるように設定しているとともに、第２リンクメンバ７３の下端部７３ｂ側を足置き部４に取り付ける位置を、この下端部７３ｂ側が前記上端部７３ａ側よりも前方且つ下方位置で支持されるように設定している。そのため、座２が上昇する場合には、その上昇に伴って、背もたれ３は、前方へ移動し、足置き部４も上方へ移動する。一方、座２が下降する場合には、その下降に伴って、背もたれ３は後方へ移動し、足置き部４も下方へと移動する。したがって、着座者の体格が小さい場合には、座２と背もたれ３と足置き部４とを相対的に近づけて対応し、着座者の体格が大きい場合には、座２と背もたれ３と足置き部４とを相対的に離して対応することができる。なお、ガススプリング６の前記ロッド６２は、その最大突出量が、第１リンクメンバ７２が略鉛直方向に沿うことになる位置まで突出しないように設定されている。
【００３２】
このような構成の椅子Ａに、例えば図３に示すような体型の小さい小学校低学年の生徒が着座する場合には、座２の下方に位置する操作レバーＢを操作してガススプリング６の作動端６１を押すと、ロッド６２が突没可能となる。この時、座２にかかる荷重を小さくしてやると、図５中実線から想像線へと示すように、座２は上方に移動し、この座２の上動に伴って第１リンクメンバ７２が前記背支桿３２を上方へ引き上げようとする。この時、背支桿３２は、前記回転支持部７１を中心にして前方へ回転移動し、背もたれ本体３１は前方すなわち座２に近付く方向へ移動することになる。さらにこの時、前記座２の上動に伴って第２のリンクメンバ７３が連結部材４１の前端部４１ｂ側を引き上げ、足置き部４は、回転支持部７１を中心としてその前端側が上方すなわち座２に近付く方向へ回転移動することになる。このように、座２の上昇にともなって、背もたれ３は前方へ、足置き部４は上方へ移動するため、座２と背もたれ３間、及び座２と足置き部４間に形成されるスペースが小さくなり、体型の小さい生徒でも、背を適正に背もたれ３に支持されるとともに足を足置き部４に置いた状態、すなわち体格にフィットさせた状態で着座することが可能である。
【００３３】
一方、例えば図２に示すように体型の大きい小学校高学年の生徒が着座する場合には、前記操作レバーＢを操作して座２にかかる荷重を大きくすると、座２が図５中想像線から実線へと示すように、下方に移動する。この座２の下降に伴って、第１リンクメンバ７２が前記背支桿３２を下方へ引き下げようとする。この時、背支桿３２は、前記回転支持部７１を中心にして後方へ回転移動し、背もたれ本体３１は後方すなわち座２から離れる方向へ移動することになる。さらにこの時、前記座２の下降に伴って第２リンクメンバ７３が連結部材４１の前端部４１ａを引き下げ、足置き部４は、回転支持部７１を中心としてその前端側が下方すなわち座２から離れる方向へ移動することになる。このように、座２の下降に伴って、背もたれ３は後方へ、足置き部４は下方へ移動するため、座２と背もたれ３間及び座２と足置き部４間に形成されるスペースが大きくなり、体型の大きい生徒でも、背を適正に背もたれ３に支持された状態で、その足を足置き部４に置いた状態、すなわち身体にフィットさせた状態で着座することが可能である。
【００３４】
なお、本実施の形態では、共に利用する天板付き家具（図示せず）の天板面の床面からの高さ位置が５７５ｍｍに設定してある。そして、小学校低学年である最小体格着座者の場合の天板面と座面の高さ位置の差尺が１５０ｍｍ、座面と足置き部４の高さ位置の差尺が２３５ｍｍ、座２の前端部から背もたれ３の前面までの奥行き寸法が２６０ｍｍとなるように設定している。また、小学校高学年である最大体格着座者の場合の天板面と座面の高さ位置の差尺が２１５ｍｍ、座面と足置き部４の高さ位置の差尺が３６０ｍｍ、座２の前端部から背もたれ３の前面までの奥行き寸法が４００ｍｍとなるように設定している。
【００３５】
近年の調査により、特に、膝下から足にかけての膝下長さ及び膝上から臀部にかけての膝上長さは、成長による体格の変化とともに、最も著しく変化することが明らかになっている。一方、前述したようなパソコン作業を行う場合には、腕を略直角に保持した姿勢で、キーボードやマウスの操作を行うものであり、天板面に対する座の位置変化は、体格の違いによってそれ程大きくないことも前記調査で明らかになっている。
【００３６】
前述したような構成の椅子Ａであると、体格の異なる着座者が、同じ天板付き家具と椅子Ａを利用してパソコン作業を行う場合にも、座２の高さ位置を変えれば、それに合わせて背もたれ３及び足置き部４の位置も連動して変化することになり、一回の操作で座２、背もたれ３及び足置き部４を適正な位置に移動させることが可能となる。特に、体格の違いによって変化が大きい膝下長さ及び膝上長さに対応させて、足置き部４の上下高さ位置及び背もたれ３の前後位置を着座者の体格に合わせて連続的に連動させることができるため、着座者は、背と足を適正に保持した状態で作業を行うことが可能となり、例えば、長期間パソコン作業を行っても、疲労感を感じにくく、また、姿勢を良好に保って視力低下等を招く恐れを有効に回避することが可能となる。
【００３７】
座２を上下方向に移動し得るガススプリング６を具備してなり、前記位置調整機構７が、前記ガススプリング６と協働して座２の移動動作を前記背もたれ３及び足置き部４の移動動作と連続的に連動させるものであるので、一回の操作で座２、背もたれ３及び足置き部４を適正な位置に決定することが可能となり、特に座２の昇降変化量に対応させて背もたれ３及び足置き部４の移動変化量を適宜設定しておけば、容易に当該椅子Ａを着座者の体格にフィットした状態とすることが可能である。
【００３８】
位置調整機構７が、座２を基準にして背もたれ３及び足置き部４の位置を決定するものであるので、体格の違いによって大きな差が生じる背もたれ３や足置き部４の位置と比べ、体格の違いによってそれ程大きな差が生じない、すなわち天板面との位置変化が少ない座２を基準にすることで、連動する背もたれと足置き部の位置決定のし易さを図ることが可能となる。
【００３９】
ガススプリング６を利用しているので、例えば、作動端６１を操作レバーＢにより押圧してロッド６２の突没を促した状態で、座２にかかる荷重を調整するだけで容易に座２の位置を調整することができる上、この座２の移動動作と連動して自動的に背もたれ３及び足置き部４の位置を調整することが可能となる。すなわち、ワンタッチ操作で座２、背もたれ３及び足置き部４の位置調整を行うことが可能であり、小学校低学年でも容易に操作を行い得るものとなる。また、座２、背もたれ３及び足置き部４の位置調整を任意に行うことができる上、さらに、その際の移動動作をスムーズなものとすることも可能である。
【００４０】
本実施の形態の椅子Ａは、天板近傍に該天板と略平行な状態で位置する座２を基準にして背もたれ３と足置き部４を連動させるようにしているので、特に、天板面が一定高さ位置にあるテーブルや机等の天板付き家具とともに良好に使用することが可能である。
【００４１】
位置調整機構７が、背もたれ３及び足置き部４を正逆方向に回転可能に支持する回転支持部７１と、後端部７２ｂを前記回転支持部７１から変位した背支桿３２の一部に正逆方向に回転可能に取り付け、前端部７２ａ側を前記ガススプリング６のロッド６２に正逆方向に回転可能に取り付けた第１リンクメンバ７２と、下端部７３ｂ側を前記回転支持部７３から変位した足置き部４の一部に正逆方向に回転可能に取り付け、上端部７３ａ側を前記ガススプリング６のロッド６２に正逆方向に回転可能に取り付けた第２リンクメンバ７３とを具備してなるので、前述した作動を行い得るものを、部材を可及的に少なくして簡素な構造で実現することが可能である。また、このように簡素な構造であるので、リンクメンバの位置設定等も行い易いものとなる。さらに、リンク部材を利用しているので、摩擦部分を小さくして動力の損失を少なくできる上、軽快な運動の伝達が可能となる。
【００４２】
背もたれ３を正逆方向に回転可能に支持する回転支持部７１が、足置き部４の基端部４ａ側を正逆方向に回転可能に支持する回転支持部を兼ねているので、さらに部品点数を削減して構造の簡素化を図ることが可能となる。
【００４３】
なお、本発明における構成は、以上説明したものに限定されないのは勿論である。例えば、椅子の構成や、位置調整機構の構成については上述したものに限定されない。本実施の形態では、脚体がキャスタに支持された脚羽根を有するものであったが、脚体の構成は上述したものに限定されない。位置調整機構の構成も上述したものに限定されず、例えば、座の上昇に伴って、背もたれを後方に移動させるような構成を実現したい場合には、さらにリンクメンバを増やすなどして、前記第１リンクメンバの後端側の取付位置を両軌跡の接点よりも前方側へ位置させるようにしてもよい。また、足置き部も同様に、座の上昇に伴って下降するものであってもよい。さらに、本実施の形態では、回転支持部が固定アームを介して脚体５に固定されたものであったが、これに限定されず移動可能なものであってもよい。また、本実施の形態では、第１リンクメンバ７２の前端部７２ａ或いは第２リンクメンバ７３の上端部７３ａが、ガススプリング６のロッド６２に取り付けられていたが、それに限られず、座の下面、座受部材、座の下面に設けたブラケット等に取り付けられるものであってもよい。その他の構成も本発明の趣旨を逸脱しない範囲で種々変形が可能である。
【００４４】
【発明の効果】
本発明は、以上説明したような構成で実施され以下に記載されるような効果を奏する。
【００４５】
すなわち、本発明は、座と、背もたれと、足を置くための足置きと、これらを支持してなる脚体とを少なくとも具備してなるものにおいて、前記背もたれが、背もたれ本体と、この背もたれ本体と支持する背支桿とを具備してなり、前記背支桿の上端部に前記背もたれ本体を取り付けるとともに、下端部が前記背もたれを正逆方向に回転可能に支持する第１の回転支持部を介して前記脚体に取り付けられており、前記座を上下方向に移動させる座昇降動作と、前記背もたれを前後方向に移動させる動作と、前記足置きを上下方向に移動させる動作とを連続的に連動させるようにしているので、一回の操作で座、背もたれ及び足置きを適正な位置に移動させることができ、座、背もたれ及び足置きの位置調整時の作業を簡易且つ円滑なものとすることが可能となる。
【００４６】
座を上下方向に移動し得る座昇降機構を具備してなり、前記連動装置が、前記座昇降機構と協働して座の移動動作を前記背もたれ及び足置きの移動動作と連続的に連動させるものであるならば、一回の操作で座、背もたれ及び足置きを適正な位置に決定することが可能となり、特に座の昇降変化量に対応させて背もたれ及び足置きの移動変化量を適宜設定しておけば、容易に椅子を着座者の体格にフィットした状態とすることが可能である。
【００４７】
連動装置が、前記座を上昇させた場合に、前記背もたれ及び足置きを前記座と近づく方向に移動させ、前記座を下降させた場合に、前記背もたれ及び足置きを前記座と離れる方向へ移動させることで、座を基準にして背もたれ及び足置きの位置を決定するものであるならば、体格の違いによって大きな差が生じる背もたれや足置きの位置と比べ、体格の違いによってそれ程大きな差が生じない、すなわち天板面との位置変化が少ない座を基準にすることで、連動する背もたれと足置きの位置決定のし易さを図ることが可能となる。
【００４８】
座昇降機構が、ガススプリングであるならば、例えば、ガススプリングの作動端を操作レバー等を利用して押圧して突没軸の突没を促した状態で、座にかかる荷重を調整するだけで容易に座の位置を調整することができる上、この座の移動動作と連動して自動的に背もたれ及び足置きの位置を調整することが可能となる。すなわち、ワンタッチ操作で座、背もたれ及び足置きの位置調整を行うことが可能であり、小学校低学年でも容易に操作を行い得るものとなる。また、座、背もたれ及び足置きの位置調整を任意に行うことができる上、さらに、その際に動きをスムーズなものとすることも可能である。
【００４９】
天板面を一定高さ位置に固定したテーブルや机等の天板付き家具とともに使用され、前記天板面上での執務作業に適するように前記座の高さ位置を設定するものであるならば、天板近傍に該天板と略平行な状態で位置する座を基準にして背もたれと足置きを連動させるようにすれば、背と足を椅子により適正に保持した状態でパソコン作業等を行うことが可能となる。
【００５０】
連動装置が、背もたれを軸部を用いて正逆方向に回転可能に支持する第１の回転支持部と、一端側を前記第１の回転支持部から変位した背もたれの一部に軸部を用いて正逆方向に回転可能に取り付け、他端側を前記座昇降機構により上下方向に移動可能に支持された座側又は足置き側の一部に軸部を用いて正逆方向に回転可能に取り付けた第１のリンク部材と、足置きを軸部を用いて正逆方向に回転可能に支持する第２の回転支持部と、一端側を前記第２の回転支持部から変位した足置きの一部に軸部を用いて正逆方向に回転可能に取り付け、他端側を前記座昇降機構により上下方向に移動可能に支持された座側の一部に軸部を用いて正逆方向に回転可能に取り付けた第２のリンク部材とを具備してなるならば、前述した作動を行い得るものを、部材を可及的に少なくして簡素な構造で実現することが可能である。また、このように簡素な構造であるので、リンク部材の位置設定等も行い易いものとなる。さらに、リンク部材を利用しているので、摩擦部分を小さくして動力の損失を少なくできる上、軽快な運動の伝達が可能となる。
【００５１】
第１の回転支持部が、足置きの基端部側を正逆方向に回転可能に支持する前記第２の回転支持部を兼ねているならば、さらに部品点数を削減して構造の簡素化を図ることが可能となる。
【図面の簡単な説明】
【図１】本発明の一実施の形態を示す斜視図。
【図２】同要部を示す分解斜視図。
【図３】同側面図。
【図４】同側面図。
【図５】同作用説明図。
【符号の説明】
２…座
３…背もたれ
３２ｂ…基端部（下端部）
４…足置き（足置き部）
６…座昇降機構（ガススプリング）
７…連動装置（位置調整機構）
７１…回転支持部
７２…第１のリンク部材（第１リンクメンバ）
７２ｂ…一端（後端部）
７２ａ…他端（前端部）
７３…第２のリンク部材（第２リンクメンバ）
７３ｂ…一端（下端部）
７３ａ…他端（上端部）
Ａ…椅子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair that is suitably used mainly for students in schools and the like.
[0002]
[Prior art]
In this kind of student chair, especially in the case of those used in elementary school, the physique difference is significant between the lower grades and the upper grades, so the seat height can be adjusted according to the physique of the seated person Therefore, a type that can adjust the position of the backrest in the front-rear direction is often used.
[0003]
The conventional specific configuration of such a chair is such that the backrest and the seat are adjusted separately, or the seat is moved up and down by a rotational movement such as a screw feed movement, and the back and forth position of the backrest is linked with this. In some cases, the seat and the backrest can be adjusted to an appropriate position so as to fit the seated person's physique by adjusting the seat.
[0004]
Also, there is a demand for adjusting the footrest that holds the foot of the seated person to the appropriate position according to its physique in conjunction with the lifting and lowering movement of the seat, similar to the one that adjusts the position of the backrest as described above. Yes.
[0005]
[Problems to be solved by the invention]
By the way, in recent years, classes conducted using a personal computer have been introduced even in elementary schools, and desks and chairs for performing personal computer work have been developed. In addition, as a result of investigating the physique of students, it has been clarified that the knee length from below the knee to the foot and the length from above the knee to the buttocks change most significantly with changes in the physique due to growth. . On the other hand, when performing computer work as described above, the keyboard and mouse are operated with the arm held at a substantially right angle. It is also clear from the survey that it is not large. Therefore, in order for a seated person with a different physique to maintain an appropriate posture when performing personal computer work etc. using the same desk and chair, the length below the knee and the length above the knee that vary greatly depending on the physique Correspondingly, it is most desirable to appropriately adjust the vertical height position of the footrest and the front and back position of the backrest according to the user's physique.
[0006]
In view of such an idea, an object of the present invention is to provide a chair that can maintain an appropriate posture for performing personal computer work or the like even when the physique of a seated person changes.
[0007]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the present invention provides a chair comprising at least a seat, a backrest, a footrest for placing a foot, and a leg that supports them. The backrest main body and a back support rod supporting the backrest main body are provided. The backrest main body is attached to the upper end portion of the back support rod, and the lower end portion rotatably supports the backrest in the forward and reverse directions. DoFirstA seat lifting / lowering operation that is attached to the leg via a rotation support portion and moves the seat in the up / down direction, an operation for moving the backrest in the front / rear direction, and an operation for moving the footrest in the up / down direction Are linked continuously.
[0008]
With such a configuration, if any one position of the seat, the backrest and the footrest is changed, the other two positions will be changed in conjunction with it, so that one operation is performed. Thus, it is possible to move the seat, backrest and footrest to appropriate positions. For example, in the lower grades of elementary school, if the movement of moving the seat upward, the movement of moving the footrest upward, and the movement of moving the backrest forward are performed in conjunction with each other, In a state where the arm is bent at a substantially right angle on the top plate surface where the foot is placed, the footrest and the backrest approach each other around the seat, that is, the user's back is improved by the backrest, and the user's foot is improved by the footrest It can be linked to the position to support. In the same way, in the case of an elementary school student with a large physique, the movement of the seat moving downward, the movement of the footrest moving downward, and the movement of the backrest moving backward can be performed in conjunction. In a state where the arm is bent at a substantially right angle on the top plate surface on which the personal computer or keyboard is placed, the footrest and the backrest are separated from each other around the seat, that is, the user's back is used by the footrest. It moves in conjunction with the position that supports the person's foot well. Therefore, the user can work with the back and legs properly held by the chair. For example, even when working on a PC for a long period of time, it is difficult to feel fatigue and keep a good posture. Therefore, it is possible to effectively avoid the possibility of causing a decrease in visual acuity.
[0009]
  As a preferred embodiment, a seat elevating mechanism capable of moving the seat in the vertical direction is provided, and the interlocking device cooperates with the seat elevating mechanism to perform the seat moving operation of the backrest and the footrest. There is one that is continuously linked with the movement operation.Further, the first rotation support portion is fixed to the leg column of the leg body whose rotation center cannot move up and down even when the seat is moved in the vertical direction.
[0010]
  To make it easier to determine the position of the backrest and footrest to be linked,When the seat is raised, the backrest and the footrest are moved in a direction approaching the seat, and when the seat is lowered, the backrest and the footrest are moved in a direction away from the seat,It is desirable to determine the position of the backrest and footrest with respect to the seat.
[0011]
In order to make it possible to adjust the position of the seat, the backrest and the footrest with a one-touch operation, the seat lifting mechanism is preferably a gas spring.
[0012]
  As a preferred embodiment, it is used together with furniture with a top plate such as a table or a desk with the top surface fixed at a fixed height position.The height of the seat is set so that it is suitable for office work on the top plate surface.It is desirable that
[0013]
  In order to realize the above-described operation with a simple structure with as few members as possible,The chair according to the present invention isInterlocking device, backrestUsing the shaftA first rotation support portion that is rotatably supported in the forward and reverse directions, and a part of the backrest that is displaced from the first rotation support portion at one end side.Using the shaftIt is attached so that it can rotate in the forward and reverse directions, and the other end is attached to a part of the seat side or the footrest side that is supported so as to be movable in the vertical direction by the seat lifting mechanismUsing the shaftThe first link member attached so as to be rotatable in the forward and reverse directions, and the footrestUsing the shaftA second rotation support portion that is rotatably supported in the forward and reverse directions, and a part of a footrest whose one end is displaced from the second rotation support portionUsing the shaftIt is attached so that it can be rotated in the forward and reverse directions, and the other end is supported by a part of the seat side supported so as to be movable in the vertical direction by the seat lifting mechanism.Using the shaftAnd a second link member attached so as to be rotatable in forward and reverse directions.It is characterized by that.
[0014]
In order to further reduce the number of parts and simplify the structure, the first rotation support portion also serves as the second rotation support portion that supports the base end side of the footrest so as to be rotatable in forward and reverse directions. It is desirable that
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0016]
The chair A according to the present embodiment is mainly used as a student chair at a school or the like, and includes a seat 2, a backrest 3, and a footrest 4 as a footrest as shown in FIG. The chair body 1 and the leg body 5 that supports the chair body 1 are provided. And this chair A is used with furniture (not shown) with a top plate such as a table or a desk whose top surface is at a fixed height position, and in particular, an OA such as a personal computer on the top plate of the furniture with the top plate. It is used to perform office work with the equipment.
[0017]
Hereinafter, a specific configuration of the chair A will be described.
[0018]
As shown in FIGS. 1 to 3, the seat 2 has a thin plate shape, and the seat receiving member 21 provided on the lower surface thereof is vertically moved to the upper end portion side of the leg body 5 via a gas spring 6 serving as a seat elevating mechanism. It is supported movably.
[0019]
The backrest 3 includes a backrest body 31 formed of a thin plate member having a substantially rectangular shape in plan view, and a back support rod 32 that supports the backrest body 31. The back support rod 32 has a substantially half-letter shape in a side view, which includes a lower half 321 and an upper half 322 bent with respect to the lower half 321. And the backrest main body 31 is attached to the upper end part 32a so that angle adjustment with respect to the back support rod 32 is possible.
[0020]
The footrest portion 4 is positioned below the seat 2 and is formed of a round pipe member bent so as to form a generally square shape in plan view. Specifically, the footrest part 4 is formed by bending a round pipe member into a substantially square shape in plan view so that a part of the rear side is opened, and welding to the left and right end parts 4a. A thin plate-like connecting member 41 extending in the front-rear direction is provided. Specifically, the right and left end portions 4 a of the footrest portion 4 are connected to a substantially central portion of the connecting member 41.
[0021]
The leg 5 includes, for example, five leg blades 51 that are movably supported by casters C, and leg struts 52 that protrude upward from the center of the leg blades 51. The gas spring 6 is provided at the upper end of the leg support 52, and a seat receiving member 21 that supports the seat 2 is supported above the gas spring 6 so as to be movable up and down by appropriate means.
[0022]
The gas spring 6 is a known type in which a valve (not shown) opens and closes and a rod 62, which is a projecting and retracting shaft, projects and retracts only when an operating end 61 provided near the upper end is pressed by an operating lever B. It is. More specifically, when the position of the seat 2 is adjusted, first, the operating end 61 of the gas spring 6 is pressed by the operating lever B so that the rod 62 performs a projecting and retracting operation. In this state, when the load applied to the seat 2 by the seated person is increased, the seat 2 is lowered. Conversely, when the load applied to the seat 2 is decreased, the seat 2 is raised.
[0023]
In such a configuration, in the present embodiment, the position adjustment as an interlocking device that continuously interlocks the operation of moving the backrest 3 in the front-rear direction and the operation of moving the footrest portion 4 in the up-down direction. A mechanism 7 is provided. The position adjusting mechanism 7 cooperates with the gas spring 6 to continuously link the movement operation of the seat 2 with the movement operation of the backrest 3 and the footrest portion 4. When the seat 2 is raised, the backrest 3 and the footrest 4 are moved in the direction approaching the seat 2, and when the seat 2 is lowered, the backrest 3 and the footrest 4 are moved away from the seat 2. It is to be moved. That is, when the height position of the seat 2 is set so as to be suitable for work work on the top board such as personal computer work, the position adjusting mechanism 7 is set in accordance with the position, and the distance between the seat 2 and the footrest portion 4 is set to be a seated person. The vertical height position of the footrest 4 and the front / rear position of the backrest 3 are adjusted so that the distance between the seat 2 and the backrest 3 is the optimum position that substantially matches the above-knee length. Is.
[0024]
As shown in FIG. 4, the position adjusting mechanism 7 is configured so that the lower end portion 32 b side, which is the base end portion of the back support rod 32, and the rear end portion 41 a side, which is the base end portion of the footrest portion 4, are forward and backward. A rotation support portion 71 that is rotatably supported and a rear end portion 72b side that is one end are attached to a part of the back support rod 32 at a position displaced from the rotation support portion 71 so as to be rotatable in the forward and reverse directions, and the other end. A position where the first link member 72 as a first link member attached to the rod 62 of the gas spring 6 so that the front end portion 72a side can be rotated in the forward and reverse directions, and the lower end portion 73b side as one end is displaced from the rotation support portion 71. The second link member is attached to the connecting member 41 of the footrest portion 4 in a rotatable manner in the forward and reverse directions, and the upper end portion 73a as the other end is attached to the rod 62 of the gas spring 6 so as to be rotatable in the forward and reverse directions. Second link member 73 It becomes Te.
[0025]
The rotation support portion 71 includes a shaft insertion hole 321 provided in the lower end portion 32b of the back support rod 32 so that the axial center direction substantially coincides with the horizontal direction, and the rear end portion 41a side of the connecting member 41 of the footrest 4. The shaft insertion hole 411 is provided, and the shaft portion p that is inserted into the shaft insertion holes 321, 411 and supports the back support rod 32 and the footrest portion 4 so as to be rotatable in the forward and reverse directions. The rotation support portion 71 is fixed to the chair body 1 by a fixed arm k fixed to the leg 5. The shaft portion p has its axis aligned in the substantially horizontal direction.
[0026]
The first link member 72 has a thin plate shape and is provided so as to extend in the front-rear direction. The front and rear end portions 72a and 72b have front and rear insertion holes 721 and 722, respectively.
[0027]
The second link member 73 has a thin plate shape and is provided so as to extend in the vertical direction. The upper and lower end portions 73a and 73b have upper and lower insertion holes 731 and 732, respectively.
[0028]
The first link member 72 and the second link member 73 rotate in the forward and reverse directions on the front end portion 72a side and the upper end portion 73a side to the upper end portion side of the rod 62 of the gas spring 6 via the axis q. It is attached as possible. Specifically, a substantially cylindrical bearing portion 621 having an axial center substantially aligned in the horizontal direction is provided at the upper end portion of the rod 62, and the shaft q supported by the bearing portion 621 has a first q. By inserting the front insertion hole 721 of the link member 72 and the upper insertion hole 731 of the second link member 73, the first and second link members 72 and 73 are rotatably supported in the forward and reverse directions.
[0029]
On the other hand, the first link member 72 inserts the shaft portion r held by the bearing portion 323 provided in the back support rod 32 into the rear insertion hole 722 so that the rear end portion 72b side is supported by the back support rod. 32 is attached to be rotatable in the forward and reverse directions. The bearing portion 323 has a substantially cylindrical shape provided with a shaft center aligned in the substantially horizontal direction on the front side of the lower half portion 321 of the lower half 321 of the back support rod 32 in the substantially vertical direction.
[0030]
Further, the second link member 73 is inserted into the lower insertion hole 732 through the shaft portion s inserted from the front insertion hole 412 provided on the front end portion 41b side of the connecting member 41 of the footrest portion 4, thereby It is attached to the footrest 4 so as to be rotatable in the forward and reverse directions.
[0031]
In the present embodiment, the position at which the rear end 72b side of the first link member 72 is attached to the back support rod 32 is supported at a position behind and below the front end portion 72a. The position where the lower end portion 73b side of the second link member 73 is attached to the footrest portion 4 is set so that the lower end portion 73b side is supported forward and below the upper end portion 73a side. It is set. Therefore, when the seat 2 rises, the backrest 3 moves forward and the footrest portion 4 also moves upward as the seat 2 rises. On the other hand, when the seat 2 is lowered, the backrest 3 is moved rearward and the footrest portion 4 is also moved downward. Therefore, when the seated person's physique is small, the seat 2, the backrest 3 and the footrest portion 4 are relatively close to each other, and when the seated person's physique is large, the seat 2, the backrest 3 and the footrest are supported. The part 4 can be relatively spaced apart. The rod 62 of the gas spring 6 is set so that the maximum protruding amount does not protrude to a position where the first link member 72 is substantially along the vertical direction.
[0032]
For example, when a small elementary school student with a small figure as shown in FIG. 3 is seated on the chair A having such a configuration, the operation lever B located below the seat 2 is operated to operate the gas spring 6. When the end 61 is pushed, the rod 62 can project and retract. At this time, if the load applied to the seat 2 is reduced, the seat 2 moves upward as indicated by the solid line in FIG. 5 and the first link member 72 is moved along with the upward movement of the seat 2. An attempt is made to raise the back support rod 32 upward. At this time, the back support rod 32 rotates and moves forward about the rotation support portion 71, and the backrest body 31 moves forward, that is, in a direction approaching the seat 2. Further, at this time, the second link member 73 pulls up the front end portion 41b side of the connecting member 41 as the seat 2 moves upward, and the footrest portion 4 has its front end side upward, i.e., seating, with the rotation support portion 71 as the center. 2 in a direction approaching 2. As described above, as the seat 2 is raised, the backrest 3 moves forward and the footrest portion 4 moves upward, so that a space is formed between the seat 2 and the backrest 3 and between the seat 2 and the footrest portion 4. Therefore, even a student with a small figure can be seated with his / her back properly supported by the backrest 3 and with his / her feet placed on the footrest 4, that is, with a physique fit.
[0033]
On the other hand, for example, as shown in FIG. 2, when an elementary school student with a large body is seated, if the load applied to the seat 2 is increased by operating the operation lever B, the seat 2 is solid from the imaginary line in FIG. 5. Move down as shown. As the seat 2 is lowered, the first link member 72 tries to lower the back support rod 32 downward. At this time, the back support rod 32 rotates backward about the rotation support portion 71, and the backrest body 31 moves backward, that is, in a direction away from the seat 2. Further, at this time, as the seat 2 is lowered, the second link member 73 lowers the front end portion 41 a of the connecting member 41, and the footrest portion 4 is separated from the seat 2 at the front end side around the rotation support portion 71. Will move in the direction. Thus, as the seat 2 descends, the backrest 3 moves backward and the footrest portion 4 moves downward, so that there is a space formed between the seat 2 and the backrest 3 and between the seat 2 and the footrest portion 4. A student who is large and has a large body shape can sit in a state where his / her leg is properly supported by the backrest 3 and his / her foot is placed on the footrest portion 4, that is, in a state of being fitted to the body.
[0034]
In the present embodiment, the height position of the top plate surface of the furniture with a top plate (not shown) used together from the floor surface is set to 575 mm. The height of the top surface and the seat surface is 150 mm, the height between the seat surface and the footrest 4 is 235 mm, and the seat 2 The depth dimension from the front end to the front surface of the backrest 3 is set to 260 mm. In addition, the difference between the height position of the top surface and the seat surface is 215 mm, the difference between the height position of the seat surface and the footrest part 4 is 360 mm, and the front end of the seat 2 in the case of the largest physique seated in the upper grade of elementary school The depth dimension from the part to the front surface of the backrest 3 is set to 400 mm.
[0035]
Recent research has revealed that the length below the knee from the knee to the foot and the length above the knee from the knee to the buttocks change most significantly with the change in the physique due to growth. On the other hand, when performing computer work as described above, the keyboard and mouse are operated with the arm held at a substantially right angle. It is also clear from the survey that it is not large.
[0036]
In the case of the chair A configured as described above, even if a seated person having a different physique performs a personal computer work using the same furniture with the top plate and the chair A, if the height position of the seat 2 is changed, In addition, the positions of the backrest 3 and the footrest portion 4 also change in conjunction with each other, and the seat 2, the backrest 3 and the footrest portion 4 can be moved to appropriate positions by a single operation. In particular, the vertical height position of the footrest 4 and the front and back position of the backrest 3 are continuously interlocked according to the physique of the seated person so as to correspond to the below-knee length and above-knee length that vary greatly depending on the physique. This makes it possible for a seated person to work with the back and legs properly held, for example, to feel less tired and to maintain a good posture even when working on a PC for a long time. Thus, it is possible to effectively avoid the risk of reducing visual acuity and the like.
[0037]
A gas spring 6 that can move the seat 2 in the vertical direction is provided, and the position adjusting mechanism 7 cooperates with the gas spring 6 to move the seat 2 and move the backrest 3 and the footrest portion 4. Since it is continuously linked with the movement, it is possible to determine the seat 2, the backrest 3 and the footrest part 4 at appropriate positions by a single operation, and in particular, corresponding to the amount of elevation change of the seat 2. If the movement change amount of the backrest 3 and the footrest part 4 is appropriately set, the chair A can be easily fitted into the seated person's physique.
[0038]
Since the position adjustment mechanism 7 determines the positions of the backrest 3 and the footrest portion 4 with respect to the seat 2, the physique is larger than the positions of the backrest 3 and the footrest portion 4 that cause a large difference due to the difference in the physique. By making the seat 2 as a reference, the position of the interlocking backrest and the footrest portion can be easily determined by using the seat 2 that does not change so much as a difference. .
[0039]
Since the gas spring 6 is used, for example, the position of the seat 2 can be easily adjusted only by adjusting the load applied to the seat 2 in a state in which the operating end 61 is pressed by the operating lever B and the rod 62 is pushed and projected. In addition, the positions of the backrest 3 and the footrest 4 can be automatically adjusted in conjunction with the movement of the seat 2. That is, it is possible to adjust the position of the seat 2, the backrest 3 and the footrest part 4 by one-touch operation, and the operation can be easily performed even in the elementary school lower grades. Further, the position adjustment of the seat 2, the backrest 3 and the footrest portion 4 can be arbitrarily performed, and the moving operation at that time can be made smooth.
[0040]
In the chair A of the present embodiment, the backrest 3 and the footrest portion 4 are interlocked with respect to the seat 2 positioned in a state substantially parallel to the top plate in the vicinity of the top plate. It can be used well with furniture with a top plate such as a table or desk whose surface is at a certain height.
[0041]
The position adjustment mechanism 7 includes a rotation support portion 71 that supports the backrest 3 and the footrest portion 4 so that the backrest 3 and the footrest portion 4 can rotate in forward and reverse directions, and a rear end 72b that is part of the back support rod 32 displaced from the rotation support portion 71. A first link member 72 that is mounted so as to be rotatable in the forward and reverse directions, and has a front end portion 72a attached to the rod 62 of the gas spring 6 so as to be rotatable in the forward and reverse directions, and a lower end portion 73b side displaced from the rotation support portion 73 A second link member 73 which is attached to a part of the footrest part 4 so as to be rotatable in the forward / reverse direction, and whose upper end part 73a is attached to the rod 62 of the gas spring 6 so as to be rotatable in the forward / reverse direction. Therefore, what can perform the above-described operation can be realized with a simple structure with as few members as possible. In addition, since the structure is simple as described above, it is easy to set the position of the link member. Further, since the link member is used, the frictional portion can be reduced to reduce the power loss, and the light motion can be transmitted.
[0042]
The rotation support portion 71 that supports the backrest 3 so as to be rotatable in the forward and reverse directions also serves as a rotation support portion that rotatably supports the base end portion 4a side of the footrest portion 4 in the forward and reverse directions. Therefore, the structure can be simplified.
[0043]
Of course, the configuration of the present invention is not limited to the above-described configuration. For example, the configuration of the chair and the configuration of the position adjustment mechanism are not limited to those described above. In the present embodiment, the leg body has leg blades supported by casters, but the configuration of the leg body is not limited to that described above. The configuration of the position adjustment mechanism is not limited to that described above. For example, when it is desired to realize a configuration in which the backrest is moved backward as the seat is lifted, the number of link members is increased to increase the number of link members. The attachment position on the rear end side of one link member may be positioned more forward than the contact point of both tracks. Similarly, the footrest portion may be lowered as the seat is raised. Furthermore, in this Embodiment, although the rotation support part was fixed to the leg body 5 via the fixed arm, it is not limited to this and may be movable. In this embodiment, the front end portion 72a of the first link member 72 or the upper end portion 73a of the second link member 73 is attached to the rod 62 of the gas spring 6. It may be attached to a seat receiving member, a bracket provided on the lower surface of the seat, or the like. Other configurations can be variously modified without departing from the spirit of the present invention.
[0044]
【The invention's effect】
The present invention is implemented with the configuration as described above, and has the following effects.
[0045]
  That is, the present invention comprises at least a seat, a backrest, a footrest for placing a foot, and a leg that supports these, the backrest, the backrest main body, and the backrest main body. And a back support rod that supports the back support body, and the backrest main body is attached to the upper end portion of the back support rod, and the lower end portion supports the backrest rotatably in the forward and reverse directions.FirstA seat lifting / lowering operation that is attached to the leg via a rotation support portion and moves the seat in the up / down direction, an operation for moving the backrest in the front / rear direction, and an operation for moving the footrest in the up / down direction The seat, backrest and footrest can be moved to the proper position with a single operation, and the work for adjusting the position of the seat, backrest and footrest is simple and smooth. Can be made.
[0046]
A seat elevating mechanism capable of moving the seat in the vertical direction, wherein the interlocking device cooperates with the seat elevating mechanism to continuously interlock the movement operation of the seat with the movement operation of the backrest and the footrest; If it is, it is possible to determine the seat, backrest and footrest at appropriate positions with a single operation, and in particular, the amount of change in movement of the backrest and footrest is set appropriately according to the amount of elevation change of the seat By doing so, it is possible to easily make the chair fit the seated person's physique.
[0047]
  The interlocking deviceWhen the seat is raised, the backrest and the footrest are moved in a direction approaching the seat, and when the seat is lowered, the backrest and the footrest are moved in a direction away from the seat,If the position of the backrest and the footrest is determined based on the seat, the difference in the physique does not cause a significant difference compared to the position of the backrest or the footrest that causes a large difference due to the difference in the physique. By using a seat with little change in position relative to the plate surface as a reference, it becomes possible to easily determine the position of the interlocking backrest and footrest.
[0048]
If the seat elevating mechanism is a gas spring, for example, only the load applied to the seat is adjusted in a state in which the operating end of the gas spring is pressed using an operation lever or the like to promote the projecting and retracting of the projecting shaft. Thus, the position of the seat can be easily adjusted, and the position of the backrest and footrest can be automatically adjusted in conjunction with the movement of the seat. That is, the position of the seat, backrest and footrest can be adjusted by one-touch operation, and the operation can be easily performed even in the elementary school lower grades. Further, the position of the seat, the backrest and the footrest can be adjusted arbitrarily, and the movement can be made smooth at that time.
[0049]
  Used with furniture with a top plate such as a table or desk with the top plate fixed at a certain height.The height of the seat is set so that it is suitable for office work on the top plate surface.If it is a thing, if the backrest and the footrest are interlocked with respect to a seat positioned in a state substantially parallel to the top plate in the vicinity of the top plate, the back and feet are properly held by the chair This makes it possible to perform personal computer work.
[0050]
  Interlocking device, backrestUsing the shaftA first rotation support portion that is rotatably supported in the forward and reverse directions, and a part of the backrest that is displaced from the first rotation support portion at one end side.Using the shaftIt is attached so that it can rotate in the forward and reverse directions, and the other end is attached to a part of the seat side or the footrest side that is supported so as to be movable in the vertical direction by the seat lifting mechanismUsing the shaftThe first link member attached so as to be rotatable in the forward and reverse directions, and the footrestUsing the shaftA second rotation support portion that is rotatably supported in the forward and reverse directions, and a part of a footrest whose one end is displaced from the second rotation support portionUsing the shaftIt is attached so that it can be rotated in the forward and reverse directions, and the other end is supported by a part of the seat side supported so as to be movable in the vertical direction by the seat lifting mechanism.Using the shaftIf the second link member mounted rotatably in the forward and reverse directions is provided, it is possible to realize the above-described operation with a simple structure with as few members as possible. It is. Moreover, since it is such a simple structure, it becomes easy to set the position of the link member and the like. Further, since the link member is used, the frictional portion can be reduced to reduce the power loss, and the light motion can be transmitted.
[0051]
If the first rotation support portion also serves as the second rotation support portion that supports the base end side of the footrest so as to be rotatable in the forward and reverse directions, the number of parts is further reduced and the structure is simplified. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the main part.
FIG. 3 is a side view of the same.
FIG. 4 is a side view of the same.
FIG. 5 is an explanatory diagram of the operation.
[Explanation of symbols]
2 ... za
3 ... Backrest
32b ... Base end (lower end)
4 ... Foot rest (foot rest)
6 ... Seat lifting mechanism (gas spring)
7. Interlocking device (position adjustment mechanism)
71 ... Rotation support
72 ... 1st link member (1st link member)
72b ... one end (rear end)
72a ... the other end (front end)
73 ... 2nd link member (2nd link member)
73b ... one end (lower end)
73a ... the other end (upper end)
A ... Chair

Claims

In a chair comprising at least a seat, a backrest, a footrest for placing a foot, and a leg that supports these,
The backrest comprises a backrest body, and a back support rod supporting the backrest body,
The backrest main body is attached to the upper end portion of the back support rod, and the lower end portion is attached to the leg body via a first rotation support portion that rotatably supports the backrest in forward and reverse directions.
A seat raising / lowering mechanism for moving the seat in the vertical direction; and an interlocking device for continuously linking the operation for moving the backrest in the front-rear direction and the operation for moving the footrest in the vertical direction, The interlocking device is to continuously link the movement operation of the seat with the movement operation of the backrest and the footrest in cooperation with the seat lifting mechanism,
The first rotation support portion is fixed to the leg strut of the leg that cannot move up and down even if the seat is moved in the up and down direction,
The interlock device has a first rotation support portion that supports the backrest so that the backrest can be rotated in the forward and reverse directions using the shaft portion, and a shaft portion on a part of the backrest whose one end is displaced from the first rotation support portion. The other end can be rotated in the forward and reverse directions using the shaft part on the seat side or the footrest side supported by the seat lifting mechanism so that it can move in the vertical direction. A first link member attached to the second rotation support portion, a second rotation support portion that supports the footrest so as to be rotatable in the forward and reverse directions using the shaft portion, and a footrest whose one end is displaced from the second rotation support portion. It is attached to a part of the seat so that it can rotate in the forward and reverse directions using the shaft, and the other end is supported by the seat lifting mechanism so that it can be moved in the vertical direction. And a second link member rotatably attached to
A chair ascending / descending operation for moving the seat in the up / down direction, an operation for moving the backrest in the front / rear direction, and an operation for moving the footrest in the up / down direction are continuously linked.

When the interlocking device raises the seat, the backrest and the footrest are moved in a direction approaching the seat, and when the seat is lowered, the backrest and the footrest are moved in a direction away from the seat. be to claim 1 chair, wherein a is to determine the position of every back and legs relative to the seat.

The chair according to claim 1 or 2 , wherein the seat elevating mechanism is a gas spring.

Used with furniture with a top plate such as a table or desk with the top plate fixed at a fixed height position, and the height of the seat is set so as to be suitable for work work on the top plate surface The chair according to claim 1, 2, or 3 .

The first rotation support portion, claim, characterized in that also serves as the second rotation support portion that rotatably supports the base end of the footrest in forward and reverse directions 1, 2, 3 or 4 The listed chair.