JP2004203217A

JP2004203217A - Vehicle seat

Info

Publication number: JP2004203217A
Application number: JP2002374969A
Authority: JP
Inventors: Katsuhiko Shinozaki; 克彦篠崎
Original assignee: TS Tech Co Ltd
Current assignee: TS Tech Co Ltd
Priority date: 2002-12-25
Filing date: 2002-12-25
Publication date: 2004-07-22
Anticipated expiration: 2022-12-25
Also published as: JP4060702B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle seat which improves the operability, performs mechanical adjustment of the elasticity of a return spring for forward inclination, uses the return spring for forward inclination in the middle-folding return of an upper backrest seat, simplifies the configuration, and reduces the cost. <P>SOLUTION: A backrest seat 3 is provided on a seat 2 provided on a vehicle body side with a free angle of inclination by the longitudinal turn around the axis 14 of turn via a reclining device R. The backrest seat 3 is divided into upper and lower portions, i.e., an upper backrest seat 4 and a lower backrest seat 5. The upper backrest seat 4 is fitted to the lower backrest seat 5 via a middle-folding mechanism 20 in a longitudinally turnable manner around the fitting transverse axis 19. A return spring 10 for forward inclination to urge the backrest seat 3 in a forward-inclining manner is provided between the seat 2 and the lower backrest seat 5. An inversion speed adjustment unit 30 to mechanically switch the magnitude of the elasticity of the return spring 10 for forward inclination is provided on the lower backrest seat 5. The inversion speed adjustment unit 30 switches the magnitude of the elasticity of the return spring 10 for forward inclination by a middle-folding detection mechanism 31 to mechanically detect the middle-folding condition by the upper backrest frame 18. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、背凭シートを上部背凭シートと下部背凭シートとに上下に分割形成した車両用シートに係るものである。
【０００２】
【従来技術】
従来、背凭シートを上部背凭シートと下部背凭シートとに上下に分割形成した車両用シートにおいて、背凭シートを常時前倒れさせる前倒れ用戻しバネと別個に、取付軸に中折れの上部背凭シートを戻すバネを設け、背凭シートを中折れ状態にすると、リクライニング装置による背凭シートの傾斜調節を規制するようにした構成は、公知である（特許文献１参照。）
即ち、背凭シートは常時前倒れ用戻しバネにより前倒れ方向に付勢されているので、中折れ状態でリクライニング装置の操作すると、過剰に速くなるので、リクライニング装置の操作自体を規制している。
【０００３】
【特許文献１】
特開２００２−２９１５６４号公報（第６−７頁、図５、図１０参照）
【０００４】
【発明が解決しようとする課題】
前記公知例では、中折れ状態のリクライニング装置の操作を規制しているので、背凭シートを元に戻してからリクライニング装置を操作することになり、操作が面倒であるという課題がある。
本願は、前倒れ用戻しバネの弾力を調節可能にして、上部背凭シートが中折れ状態のときでもリクライニング装置を操作可能にすると共に、背凭シートの前倒れ速度を適正にし、また、前倒れ用戻しバネの弾力を中折れ状態の上部背凭シートの復帰に利用できるようにしたものである。
【０００５】
【発明の目的】
操作性の向上、前倒れ用戻しバネの弾力の機械的調節の実現、上部背凭シートの中折れ復帰に前倒れ用戻しバネの利用の実現、構成の簡素化、コスト削減。
【０００６】
【課題を解決するための手段】
本発明は、車体側に設けた座席シート２にリクライニング装置Ｒを介して回動中心軸１４に前後回動させて傾斜角度自在に背凭シート３を設け、該背凭シート３は上部背凭シート４と下部背凭シート５とに上下に分割形成し、前記上部背凭シート４は中折れ機構２０を介して下部背凭シート５に取付横軸１９を中心に前後回動自在に取付けたシートにおいて、前記座席シート２と前記下部背凭シート５との間には常時背凭シート３を前倒れするように付勢する前倒れ用戻しバネ１０を設け、前記下部背凭シート５には、前記前倒れ用戻しバネ１０の弾力の強弱を機械的に切替える反転速度調節部３０を設け、該反転速度調節部３０は前記上部背凭フレーム１８が中折れ状態を機械的に検出する中折れ検出機構３１によって前倒れ用戻しバネ１０の弾力の強弱を切替えるように構成した車両用シートとしたものである。
本発明は、前記反転速度調節部３０は、下部背凭シート５に横軸３４により回動自在に取付けたベルクランク３２の一方端３３を、前記回動中心軸１４に一端１１を固定状態に取付けた前倒れ用戻しバネ１０の他端１６に取付けて構成した車両用シートとしたものである。
本発明は、前記中折れ検出機構３１は、前記取付横軸１９に基部を固定状態に取付けたアーム３６により構成し、アーム３６の先端と前記反転速度調節部３０を構成するベルクランク３２の他方端３５とを連結した車両用シートとしたものである。
本発明は、前記アーム３６の先端と前記反転速度調節部３０を構成するベルクランク３２の他方端３５とはロッド３７により連結し、もって、前記前倒れ用戻しバネ１０の弾力が上部背凭シート４を通常状態に戻す戻しバネとして兼用する構成とした車両用シートとしたものである。
本発明は、車体側に設けた座席シート２にリクライニング装置Ｒを介して回動中心軸１４に前後回動させて傾斜角度自在に背凭シート３を設け、該背凭シート３は上部背凭シート４と下部背凭シート５とに上下に分割形成し、前記上部背凭シート４は中折れ機構２０を介して下部背凭シート５に取付横軸１９を中心に前後回動自在に取付けたシートにおいて、前記回動中心軸１４には常時背凭シート３を前倒れするように付勢する前倒れ用戻しバネ１０の一端１１を係止し、該前倒れ用戻しバネ１０の他端１６は下部背凭シート５の下部背凭フレーム１２に横軸３４により回動自在に設けたベルクランク３２の一方端３３に係止し、前記ベルクランク３２の他方端３５にはロッド３７の下端を取付け、ロッド３７の上端は前記取付横軸１９に基部を固定したアーム３６の先端に取付けた車両用シートとしたものである。
【０００７】
【実施例】
本発明の実施例を図面により説明すると、１は車両用シート、２は座席シート２、３は背凭シートであり、背凭シート３は図示は省略するが、周知のリクライニング装置Ｒにより座席シート２に対して傾斜角度自在に構成する。背凭シート３は上部背凭シート４と下部背凭シート５とに上下に分割形成し、上部背凭シート４を下部背凭シート５に対して前後方向に回動自在に構成し、所謂中折れシートに構成する。
【０００８】
この場合、上部背凭シート４と下部背凭シート５の取付部分には、周知のリクライニング装置を設け、下部背凭シート５に対して上部背凭シート４が傾斜角度自在に調節できればよく、本願の要件ではない。
【０００９】
座席シート２と背凭シート３の間には、リクライニング装置Ｒをアンロック状態にしたとき、背凭シート３を前倒れするように付勢する前倒れ用戻しバネ１０を設ける。前倒れ用戻しバネ１０はコイル状に形成し、中心に位置する一端１１は背凭シート３の下部背凭シート５の下部背凭フレーム１２を座席シート２の座席フレーム１３に回動自在に取付けた回動中心軸１４に固体状態に取付ける。
【００１０】
前倒れ用戻しバネ１０の他端１６は下部背凭フレーム１２側に取付け、リクライニング装置Ｒをアンロック状態にしたとき、背凭シート３を前倒れするように付勢する。
【００１１】
１８は背凭シート３の上部背凭シート４の上部背凭フレームであり、上部背凭フレーム１８はその下部を取付横軸１９により下部背凭フレーム１２の上部に回動自在に取付け、取付横軸１９の軸周りに上部背凭シート４を下部背凭シート５に対して前後方向に回動させる中折れ機構２０を設ける。中折れ機構２０の構成は任意であるが、中折れ機構２０は、取付横軸１９の軸周りに上部背凭シート４を下部背凭シート５に対して回動させると共に、所定位置で回動を停止させてロックするようにし、少なくとも、下部背凭フレーム１２と上部背凭フレーム１８が連続した状態と、下部背凭フレーム１２に対して上部背凭フレーム１８を回動させた中折れ状態のときに、ロックするように構成する。
２１はブラケット、２２は係合溝、２３は係合体、２４は操作レバーである。
【００１２】
しかして、下部背凭フレーム１２には、前記前倒れ用戻しバネ１０の弾力の強弱を機械的に切替える反転速度調節部３０を設け、反転速度調節部３０には前記上部背凭フレーム１８が中折れ状態を機械的に検出する中折れ検出機構３１を取付け、中折れ検出機構３１によって反転速度調節部３０を介して前倒れ用戻しバネ１０の弾力の強弱を切替える。
【００１３】
即ち、前倒れ用戻しバネ１０は、上部背凭シート４と下部背凭シート５がフラットで座席シート２に対して略水平状態のときの上部背凭シート４の上部を起立させる弾力を有して構成しているから、上部背凭シート４を下部背凭シート５に対して中折れさせた状態で起立させると、起立するときの速度が過剰に早くなる。
【００１４】
そのため、上部背凭シート４が中折れになったことを中折れ検出機構３１が検出すると反転速度調節部３０により前倒れ用戻しバネ１０を緩めて、背凭シート３を前倒れさせるときの速度を遅く（上部背凭シート４と下部背凭シート５がフラットのときの前倒れ速度と略同じ設定）にする。
【００１５】
前記反転速度調節部３０は、前倒れ用戻しバネ１０の他端１６を下部背凭フレーム１２に設けたベルクランク３２の一方端３３に取付ける。ベルクランク３２は下部背凭フレーム１２に横軸３４により回動自在に取付けて構成する。
【００１６】
即ち、ベルクランク３２の他方端３５を押してベルクランク３２を回動させると、ベルクランク３２の一方端３３は前倒れ用戻しバネ１０の他端１６を前倒れ用戻しバネ１０の巻き方向の緩み方向に移動させ、前倒れ用戻しバネ１０の弾力を「弱」にし、この状態で背凭シート３を前倒しすると、前倒れ用戻しバネ１０が緩んでいる分背凭シート３を前倒れさせるときの速度を遅くする。
【００１７】
この場合、前倒れ用戻しバネ１０の巻き方向は、背凭シート３が常時前方回動するように付勢作用するように図において右巻きであり、前倒れ用戻しバネ１０の他端１６はベルクランク３２の前側に位置する一方端３３に接続する。
【００１８】
また、前記取付横軸１９には上部背凭シート４の前後回動と連動して回動するようにアーム３６の基部を固定し、これにより中折れ検出機構３１を構成し、アーム３６にロッド３７の上端部を取付、ロッド３７の下端部はベルクランク３２の他方端３５に接続し、中折れ検出機構３１と反転速度調節部３０とをロッド３７により連動連結する。
【００１９】
したがって、本願で反転速度調節部３０と中折れ検出機構３１は、ベルクランク３２とロッド３７とアーム３６により上部背凭シート４の中折れ連動リンク４０によっても構成することができ、安価に構成できる。
【００２０】
また、反転速度調節部３０と中折れ検出機構３１を中折れ連動リンク４０により構成すると、中折れさせた上部背凭シート４を通常状態に戻すとき、前倒れ用戻しバネ１０の弾力をベルクランク３２、ロッド３７を介してアーム３６に作用させ、前倒れ用戻しバネ１０の弾力を上部背凭シート４の戻しにも利用できる。
【００２１】
【作用】
次に作用を述べる。
リクライニング装置Ｒをアンロックにすると、背凭シート３は座席シート２に対して回動自在になり、座席シート２に対して略水平のフルフラット状態から起立状態の間、傾斜角度を調節し、所望の傾斜角度でリクライニング装置Ｒをロックさせ、調節した傾斜角度に背凭シート３を保持する。
【００２２】
また、着座していない状態でリクライニング装置Ｒをアンロックにすると、背凭シート３は前倒れ用戻しバネ１０の弾力により常時前倒れするように付勢されているから、前倒れ用戻しバネ１０の弾力により所定角度まで一気に背凭シート３は前倒れする。
【００２３】
しかして、背凭シート３は、上部背凭シート４と下部背凭シート５とに上下に分割形成し、上部背凭シート４は取付軸取付横軸１９により下部背凭シート５の上部に回動自在に取付けているから、中折れ機構２０をアンロックすると、上部背凭シート４は下部背凭シート５に対して回動自在となり、下部背凭シート５に対して上部背凭シート４が略直角に屈曲する中折れ状態から連続した状態の間傾斜角度を調節し、所望の傾斜角度で中折れ機構２０をロックさせ、調節した傾斜角度に上部背凭シート４を保持する。
【００２４】
この場合、下部背凭フレーム１２には、前倒れ用戻しバネ１０の弾力の強弱を機械的に切替える反転速度調節部３０を設けているから、上部背凭シート４が中折れ状態のときに反転速度調節部３０により前倒れ用戻しバネ１０の弾力を「弱」にでき、中折れのままリクライニング装置Ｒをアンロック操作しても、ゆっくり背凭シート３は前方回動する。
【００２５】
したがって、背凭シート３の前方回動により、着座者の背に背凭シート３が衝撃的に当たるのを防止でき、中折れのままリクライニング装置Ｒを操作後に、中折れの上部背凭シート４を元に戻してもよく、操作順序が規制されず、操作性を向上させる。
【００２６】
即ち、装置の操作するときに、操作手順が設定と相違しても、操作者は気づかいことがあり、故障と誤認することもあるが、本願では、リクライニング装置Ｒの操作と中折れ検出機構３１の操作との間に優先関係を持たせていないので、操作性を向上させる。
【００２７】
しかして、上部背凭シート４と下部背凭シート５の取付横軸１９周りには上部背凭シート４の中折れ状態を機械的に検出する中折れ検出機構３１を取付け、反転速度調節部３０は中折れ検出機構３１が上部背凭シート４の中折れ状態を機械的に検出すると前倒れ用戻しバネ１０の弾力の強弱を切替えるように構成しているから、上部背凭シート４が中折れ状態になると、反転速度調節部３０は自動的に前倒れ用戻しバネ１０を緩め、背凭シート３を前倒れさせるときの速度を遅くする。
【００２８】
しかして、コイル状に形成した前倒れ用戻しバネ１０は、一端１１を背凭シート３の回動中心である回動中心軸１４に固体状態に取付け、前倒れ用戻しバネ１０の他端１６は反転速度調節部３０のベルクランク３２の一方端３３に取付けているから、反転速度調節部３０は、ベルクランク３２の他方端３５を押してベルクランク３２を回動させると、ベルクランク３２の一方端３３は前倒れ用戻しバネ１０の他端１６を前倒れ用戻しバネ１０の巻き方向の緩み方向に移動させ、前倒れ用戻しバネ１０の弾力を「弱」にし、この状態で背凭シート３を前倒しすると、前倒れ用戻しバネ１０が緩んでいる分背凭シート３を前倒れさせるときの速度を遅くする。
【００２９】
しかして、上部背凭シート４の中折れの中心の取付横軸１９には上部背凭シート４の前後回動と連動して回動するアーム３６の基部を固定して中折れ検出機構３１を構成しているから、アーム３６とベルクランク３２の他方端３５とを接続すると、反転速度調節部３０は中折れ検出機構３１に連結され、上部背凭シート４が中折れ状態になると、反転速度調節部３０は自動的に前倒れ用戻しバネ１０を緩め、背凭シート３を前倒れさせるときの速度を遅くする。
【００３０】
反対に、中折れの上部背凭シート４を元に戻すと、反転速度調節部３０は自動的に前倒れ用戻しバネ１０を締めて、背凭シート３を前倒れさせるときの速度を遅くする。
【００３１】
しかして、反転速度調節部３０と中折れ検出機構３１との連結構成は、ロッド３７により行い、ロッド３７の下端部にベルクランク３２の他方端３５を、ロッド３７の上端部にアーム３６の先端を夫々連結すると、反転速度調節部３０と中折れ検出機構３１とは互いに連動連結関係となる。
【００３２】
このように、ベルクランク３２で構成した反転速度調節部３０とアーム３６により構成した中折れ検出機構３１とをロッド３７で連結すると、上部背凭シート４を中折れさせると、アーム３６が取付横軸１９中心に回動し、アーム３６はロッド３７を下方に押し、ロッド３７はベルクランク３２の他方端３５を押し、ベルクランク３２の一方端３３は前倒れ用戻しバネ１０の他端１６を緩み方向に押して、前倒れ用戻しバネ１０の弾力を「弱」に切替える。
【００３３】
反対に、上部背凭シート４を通常状態に戻すとき、緩るめられた前倒れ用戻しバネ１０が元に復帰する弾力がロッド３７に掛かっているから、中折れ機構２０をアンロックさせると、ロッド３７の規制が外れて、前倒れ用戻しバネ１０が元に復帰する弾力で上部背凭シート４を通常状態に戻す。
【００３４】
したがって、前倒れ用戻しバネ１０はロッド３７を介して上部背凭シート４の戻しバネとしても作用する。
【００３５】
しかして、前記回動中心軸１４には常時背凭シート３を前倒れするように付勢する前倒れ用戻しバネ１０の一端１１を係止し、該前倒れ用戻しバネ１０の他端１６は下部背凭シート５の下部背凭フレーム１２に横軸３４により回動自在に設けたベルクランク３２の一方端３３に係止し、前記ベルクランク３２の他方端３５にはロッド３７の下端を取付け、ロッド３７の上端は前記取付横軸１９に基部を固定したアーム３６の先端に取付けているから、ベルクランク３２とロッド３７とアーム３６により上部背凭シート４の中折れ連動リンク４０により構成でき、安価に構成できる。
【００３６】
即ち、上部背凭シート４を前倒れさせると、アーム３６が前方回動し、ロッド３７が下動するように配置し、ロッド３７の下端と前倒れ用戻しバネ１０の他端３３の間にはベルクランク３２を設けているから、アーム３６の回動をベルクランク３２により変換させて前倒れ用戻しバネ１０を緩ませられる。
【００３７】
また、中折れ連動リンク４０によりアーム３６とバネ１０とを接続するから、中折れさせた上部背凭シート４を通常状態に戻すため、中折れ機構２０をアンロックさせると、ロッド３７によるベルクランク３２の回動を抑えているのが外れ、ベルクランク３２により強制的に緩み方向に移動させていたバネ１０の他端１６は元の位置に復帰し、これによりロッド３７は上動し、ロッド３７はアーム３６を回動させ、アーム３６は取付横軸１９を回転させて上部背凭シート４を通常状態に戻す。
【００３８】
【効果】
本発明は、車体側に設けた座席シート２にリクライニング装置Ｒを介して回動中心軸１４に前後回動させて傾斜角度自在に背凭シート３を設け、該背凭シート３は上部背凭シート４と下部背凭シート５とに上下に分割形成し、前記上部背凭シート４は中折れ機構２０を介して下部背凭シート５に取付横軸１９を中心に前後回動自在に取付けたシートにおいて、前記座席シート２と前記下部背凭シート５との間には常時背凭シート３を前倒れするように付勢する前倒れ用戻しバネ１０を設け、前記下部背凭シート５には、前記前倒れ用戻しバネ１０の弾力の強弱を機械的に切替える反転速度調節部３０を設け、該反転速度調節部３０は前記上部背凭フレーム１８が中折れ状態を機械的に検出する中折れ検出機構３１によって前倒れ用戻しバネ１０の弾力の強弱を切替えるように構成した車両用シートとしたものであるから、中折れ検出機構３１によって反転速度調節部３０は前倒れ用戻しバネ１０の弾力の強弱を切替えられ、着座者の背に背凭シート３が衝撃的に当たるのを防止でき、また、リクライニング装置Ｒの操作と中折れ機構２０の操作との間に優先関係を持たせていないので、操作性を向上させる。
本発明は、前記反転速度調節部３０は、下部背凭シート５に横軸３４により回動自在に取付けたベルクランク３２の一方端３３を、前記回動中心軸１４に一端１１を固定状態に取付けた前倒れ用戻しバネ１０の他端１６に取付けて構成した車両用シートとしたものであるから、機械的構成により反転速度調節部３０を構成でき、コストを低くし、作動を確実にし、電気の動力を不要にして操作性を向上させる。
本発明は、前記中折れ検出機構３１は、前記取付横軸１９に基部を固定状態に取付けたアーム３６により構成し、アーム３６の先端と前記反転速度調節部３０を構成するベルクランク３２の他方端３５とを連結した車両用シートとしたものであるから、機械的構成により中折れ検出機構３１を構成でき、コストを低くし、作動を確実にし、電気の動力を不要にして操作性を向上させる。
本発明は、前記アーム３６の先端と前記反転速度調節部３０を構成するベルクランク３２の他方端３５とはロッド３７により連結し、もって、前記前倒れ用戻しバネ１０の弾力が上部背凭シート４を通常状態に戻す戻しバネとして兼用する構成とした車両用シートとしたものであるから、前倒れ用戻しバネ１０を上部背凭シート４の中折れを戻すバネに兼用でき、一層、コストを低くできる。
本発明は、車体側に設けた座席シート２にリクライニング装置Ｒを介して回動中心軸１４に前後回動させて傾斜角度自在に背凭シート３を設け、該背凭シート３は上部背凭シート４と下部背凭シート５とに上下に分割形成し、前記上部背凭シート４は中折れ機構２０を介して下部背凭シート５に取付横軸１９を中心に前後回動自在に取付けたシートにおいて、前記回動中心軸１４には常時背凭シート３を前倒れするように付勢する前倒れ用戻しバネ１０の一端１１を係止し、該前倒れ用戻しバネ１０の他端１６は下部背凭シート５の下部背凭フレーム１２に横軸３４により回動自在に設けたベルクランク３２の一方端３３に係止し、前記ベルクランク３２の他方端３５にはロッド３７の下端を取付け、ロッド３７の上端は前記取付横軸１９に基部を固定したアーム３６の先端に取付けた車両用シートとしたものであるから、上部背凭シート４の中折れにより前倒れ用戻しバネ１０の弾力の強弱を切替えられ、着座者の背に背凭シート３が衝撃的に当たるのを防止でき、また、リクライニング装置Ｒの操作と中折れ機構２０の操作との間に優先関係を持たせていないので操作性を向上させ、機械的構成によりコストを低くし、作動を確実にし、電気の動力を不要にして操作性を向上させる。
【図面の簡単な説明】
【図１】通常着座状態のシートの側面図。
【図２】通常着座状態の背凭シートフレームおよび座席シートフレームの側面図。
【図３】中折れ機構による中折れ状態の側面図。
【図４】フルフラットモードの側面図。
【図５】背凭シートの中折れ状態の側面図。
【図６】中折れ状態での背凭シートの前倒れの側面図。
【図７】中折れ状態での背凭シートフレームおよび座席シートフレームの側面図。
【符号の説明】
１…車両用シート、２…座席シート、３…背凭シート、４…上部背凭シート、５…下部背凭シート、１０…前倒れ用戻しバネ、１１…一端、１２…下部背凭フレーム、１３…座席フレーム、１４…回動中心軸、１６…他端、１８…上部背凭フレーム、１９…取付横軸、２０…中折れ機構、３０…反転速度調節部、３１…中折れ検出機構、３２…ベルクランク、３３…一方端、３４…横軸、３５…他方端、３６…アーム、３７…ロッド、４０…中折れ連動リンク。[0001]
[Industrial applications]
The present invention relates to a vehicle seat in which a backrest sheet is vertically divided into an upper backrest sheet and a lower backrest sheet.
[0002]
[Prior art]
Conventionally, in a vehicle seat in which a backrest seat is formed into an upper backrest seat and a lower backrest seat in a vertically divided manner, separately from a front-falling return spring for always leaning the backrest seat forward, a middle folding is provided on a mounting shaft. A configuration is known in which a spring for returning the upper backrest sheet is provided, and when the backrest sheet is folded in the middle, the inclination adjustment of the backrest sheet by the reclining device is regulated (see Patent Document 1).
That is, since the backrest sheet is constantly urged in the forward leaning direction by the forward fall-back spring, operating the reclining device in the middle-folded state is excessively fast, so the operation itself of the reclining device is restricted. .
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-291564 (see pages 6-7, FIGS. 5 and 10)
[0004]
[Problems to be solved by the invention]
In the above-mentioned known example, since the operation of the reclining device in the folded state is regulated, the reclining device must be operated after the backrest sheet is returned to the original position, and there is a problem that the operation is troublesome.
This application makes it possible to adjust the elasticity of the return spring for forward leaning, to enable the reclining device to be operated even when the upper backrest seat is in the middle folded state, to make the forward leaning speed of the backrest seat appropriate, and The elasticity of the fall-back spring can be used to return the upper backrest sheet in the middle folded state.
[0005]
[Object of the invention]
Improved operability, mechanical adjustment of the elasticity of the front-return return spring, realization of the use of the front-return spring for returning the middle back of the upper backrest sheet, simplification of the configuration, and cost reduction.
[0006]
[Means for Solving the Problems]
According to the present invention, a backrest seat 3 is provided on a seat 2 provided on a vehicle body side so that the backrest seat 3 can be tilted freely by being rotated back and forth about a rotation center shaft 14 via a reclining device R, and the backrest seat 3 is an upper backrest. The upper backrest sheet 4 is divided vertically into a seat 4 and a lower backrest sheet 5, and the upper backrest sheet 4 is attached to the lower backrest sheet 5 via a folding mechanism 20 so as to be rotatable back and forth about a mounting horizontal axis 19. In the seat, a return spring 10 is provided between the seat 2 and the lower backrest sheet 5 so as to always urge the backrest sheet 3 to fall forward. A reversing speed adjusting unit 30 for mechanically switching the strength of the elasticity of the front-falling return spring 10, wherein the reversing speed adjusting unit 30 is configured to mechanically detect the middle folding state of the upper backrest frame 18. The return spring 1 for falling forward by the detection mechanism 31 Strength of elasticity is obtained by the configuration the vehicle seat to switch.
According to the present invention, the reversing speed adjusting unit 30 fixes the one end 33 of the bell crank 32 rotatably attached to the lower backrest sheet 5 by the horizontal shaft 34 and the one end 11 to the rotation center shaft 14. This is a vehicle seat configured to be attached to the other end 16 of the attached fall-back return spring 10.
In the present invention, the center-break detecting mechanism 31 is constituted by an arm 36 having a base fixed to the mounting horizontal shaft 19, and the other end of the arm 36 and the bell crank 32 constituting the reversing speed adjusting unit 30. This is a vehicle seat connected to the end 35.
According to the present invention, the distal end of the arm 36 and the other end 35 of the bell crank 32 constituting the reversing speed adjusting section 30 are connected by a rod 37, so that the elasticity of the return spring 10 for falling forward decreases the upper back seat. 4 is a vehicle seat configured to be also used as a return spring for returning to a normal state.
According to the present invention, a backrest seat 3 is provided on a seat 2 provided on a vehicle body side so that the backrest seat 3 can be tilted freely by being rotated back and forth about a rotation center shaft 14 via a reclining device R, and the backrest seat 3 is an upper backrest. The upper backrest sheet 4 is divided vertically into a seat 4 and a lower backrest sheet 5, and the upper backrest sheet 4 is attached to the lower backrest sheet 5 via a folding mechanism 20 so as to be rotatable back and forth about a mounting horizontal axis 19. In the seat, one end 11 of a front-falling return spring 10 that constantly urges the backrest sheet 3 to fall forward is locked to the rotation center shaft 14, and the other end 16 of the front-falling return spring 10 is locked. Is fixed to one end 33 of a bell crank 32 rotatably provided on the lower back frame 12 of the lower back seat 5 by a horizontal shaft 34, and the lower end of a rod 37 is attached to the other end 35 of the bell crank 32. Attach the upper end of the rod 37 to the attachment horizontal axis 19 Parts is obtained by a vehicle seat attached to the tip of the fixed arm 36 a.
[0007]
【Example】
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. 1 is a vehicle seat, 2 is a seat 2, 3 is a backrest seat, and the backrest seat 3 is not shown, but is a seat reclining device using a well-known reclining device R. 2 is configured to be freely tiltable. The backrest sheet 3 is vertically divided into an upper backrest sheet 4 and a lower backrest sheet 5, and the upper backrest sheet 4 is configured to be rotatable in the front-rear direction with respect to the lower backrest sheet 5. Construct a folded sheet.
[0008]
In this case, a well-known reclining device is provided at a portion where the upper backrest sheet 4 and the lower backrest sheet 5 are attached, so that the upper backrest sheet 4 can be freely adjusted to the inclination angle with respect to the lower backrest sheet 5. Not a requirement.
[0009]
Between the seat 2 and the backrest seat 3, there is provided a front-falling return spring 10 for urging the backrest seat 3 to fall forward when the reclining device R is unlocked. The front-falling return spring 10 is formed in a coil shape, and one end 11 located at the center is rotatably attached to the lower backrest frame 12 of the lower backrest sheet 5 of the backrest seat 3 to the seat frame 13 of the seat 2. And attached to the rotating center shaft 14 in a solid state.
[0010]
The other end 16 of the forward fall return spring 10 is attached to the lower backrest frame 12 side, and urges the backrest sheet 3 to fall forward when the reclining device R is unlocked.
[0011]
Reference numeral 18 denotes an upper backrest frame of the upper backrest sheet 4 of the backrest sheet 3. The lower part of the upper backrest frame 18 is rotatably mounted on the upper part of the lower backrest frame 12 by a mounting horizontal shaft 19. A center folding mechanism 20 for rotating the upper backrest sheet 4 in the front-rear direction with respect to the lower backrest sheet 5 is provided around the axis of the shaft 19. Although the configuration of the center folding mechanism 20 is arbitrary, the center folding mechanism 20 rotates the upper backrest sheet 4 about the axis of the mounting horizontal shaft 19 with respect to the lower backrest sheet 5 and rotates at a predetermined position. Is stopped and locked, at least in a state where the lower backrest frame 12 and the upper backrest frame 18 are continuous with each other, and a state in which the upper backrest frame 18 is rotated with respect to the lower backrest frame 12 in a bent state. Sometimes, it is configured to lock.
21 is a bracket, 22 is an engagement groove, 23 is an engagement body, and 24 is an operation lever.
[0012]
Thus, the lower backrest frame 12 is provided with a reversing speed adjusting unit 30 for mechanically switching the strength of the rebound spring 10 for forward leaning, and the reversing speed adjusting unit 30 is provided with the upper backrest frame 18 in the middle. A middle-bend detection mechanism 31 for mechanically detecting a broken state is attached, and the middle-bend detection mechanism 31 switches the strength of the elasticity of the front-fallback return spring 10 via the reversing speed adjusting unit 30.
[0013]
That is, the front-falling return spring 10 has elasticity for erecting the upper part of the upper backrest sheet 4 when the upper backrest sheet 4 and the lower backrest sheet 5 are flat and substantially horizontal with respect to the seat 2. Therefore, if the upper backrest sheet 4 is erected in a state where the upper backrest sheet 4 is folded in the middle with respect to the lower backrest sheet 5, the speed at which the upper backrest sheet 4 stands up becomes excessively fast.
[0014]
Therefore, when the middle fold detection mechanism 31 detects that the upper backrest sheet 4 is folded in the middle, the reversing speed adjusting unit 30 loosens the return spring 10 for falling forward, and the speed at which the backrest sheet 3 falls forward. (Setting substantially the same as the forward falling speed when the upper backrest sheet 4 and the lower backrest sheet 5 are flat).
[0015]
The reversing speed adjusting section 30 attaches the other end 16 of the front-falling return spring 10 to one end 33 of a bell crank 32 provided on the lower backrest frame 12. The bell crank 32 is rotatably mounted on the lower backrest frame 12 by a horizontal shaft 34.
[0016]
That is, when the other end 35 of the bell crank 32 is pushed to rotate the bell crank 32, the one end 33 of the bell crank 32 loosens the other end 16 of the front falling return spring 10 in the winding direction of the front falling return spring 10. When the backrest sheet 3 is moved forward in this direction and the elasticity of the front-falling return spring 10 is set to "weak" and the backrest sheet 3 is moved forward in this state, the backrest sheet 3 is tilted forward by an amount corresponding to the loosening of the front-falling return spring 10. Slow down the speed.
[0017]
In this case, the winding direction of the front-falling return spring 10 is right-handed in the drawing so as to bias the backrest sheet 3 so that the backrest sheet 3 always rotates forward. It is connected to one end 33 located on the front side of the bell crank 32.
[0018]
Further, the base of the arm 36 is fixed to the mounting horizontal shaft 19 so as to rotate in conjunction with the forward and backward rotation of the upper backrest sheet 4, thereby forming a center bending detecting mechanism 31. The upper end of the rod 37 is attached, the lower end of the rod 37 is connected to the other end 35 of the bell crank 32, and the middle fold detecting mechanism 31 and the reversing speed adjusting unit 30 are connected by the rod 37.
[0019]
Therefore, in the present application, the reversing speed adjusting unit 30 and the center fold detecting mechanism 31 can also be configured by the middle fold link 40 of the upper backrest sheet 4 by the bell crank 32, the rod 37, and the arm 36, and can be configured at a low cost. .
[0020]
Further, when the reversing speed adjusting section 30 and the center bending detecting mechanism 31 are constituted by the center bending interlocking link 40, when returning the center back folded upper backrest sheet 4 to the normal state, the elasticity of the front-falling return spring 10 is reduced by a bell crank. By acting on the arm 36 via the rod 32 and the rod 37, the elasticity of the return spring 10 for falling forward can also be used for returning the upper backrest sheet 4.
[0021]
[Action]
Next, the operation will be described.
When the reclining device R is unlocked, the backrest seat 3 becomes rotatable with respect to the seat 2, and adjusts the inclination angle from the substantially flat full-flat state to the upright state with respect to the seat 2, The reclining device R is locked at a desired inclination angle, and the backrest sheet 3 is held at the adjusted inclination angle.
[0022]
Further, when the reclining device R is unlocked in a state where the seat is not seated, the backrest sheet 3 is urged to always fall forward by the elasticity of the return spring 10 for forward leaning. The backrest sheet 3 falls forward at a stretch to a predetermined angle by the elasticity of the backrest.
[0023]
The backrest sheet 3 is vertically divided into an upper backrest sheet 4 and a lower backrest sheet 5, and the upper backrest sheet 4 is turned to the upper part of the lower backrest sheet 5 by a mounting shaft mounting horizontal shaft 19. When the center folding mechanism 20 is unlocked, the upper backrest sheet 4 becomes rotatable with respect to the lower backrest sheet 5, and the upper backrest sheet 4 is moved relative to the lower backrest sheet 5. The tilt angle is adjusted during the continuous state from the bent state at a substantially right angle, the middle bending mechanism 20 is locked at a desired tilt angle, and the upper backrest sheet 4 is held at the adjusted tilt angle.
[0024]
In this case, since the lower backrest frame 12 is provided with the reversing speed adjusting unit 30 for mechanically switching the strength of the elasticity of the front-falling return spring 10, the upper backrest sheet 4 is turned upside down when the upper backrest sheet 4 is folded in the middle. The elasticity of the front-falling return spring 10 can be set to "weak" by the speed adjusting unit 30, and even if the reclining device R is unlocked with the center folded, the backrest seat 3 slowly rotates forward.
[0025]
Therefore, it is possible to prevent the backrest sheet 3 from hitting the back of the seated person by the forward rotation of the backrest seat 3, and to operate the reclining device R with the middle bent, the upper folded backrest sheet 4 is folded. The order of operation may be restored, and the operability is improved.
[0026]
That is, when operating the apparatus, even if the operation procedure is different from the setting, the operator may be aware of the setting and may mistakenly determine that the apparatus is out of order. The operability is improved because no priority is given to the operation.
[0027]
Thus, a center-bending detection mechanism 31 for mechanically detecting the middle bending state of the upper backrest sheet 4 is mounted around the mounting horizontal axis 19 of the upper backrest sheet 4 and the lower backrest sheet 5. Is configured so that when the middle folding detection mechanism 31 mechanically detects the middle folding state of the upper backrest sheet 4, the strength of the elasticity of the return spring 10 for forward fall is switched. In this state, the reversing speed adjusting unit 30 automatically loosens the front-falling return spring 10 to reduce the speed at which the backrest sheet 3 falls forward.
[0028]
Thus, one end 11 of the front-falling return spring 10 formed in a coil shape is solidly attached to a rotation center shaft 14 which is the center of rotation of the backrest sheet 3. Is attached to one end 33 of the bell crank 32 of the reversing speed adjusting unit 30. When the reversing speed adjusting unit 30 pushes the other end 35 of the bell crank 32 to rotate the bell crank 32, one end of the bell crank 32 The end 33 moves the other end 16 of the front-falling return spring 10 in the loosening direction of the winding direction of the front-falling return spring 10 to make the elasticity of the front-falling return spring 10 “weak”. When the backrest sheet 3 is tilted forward, the speed at which the backrest sheet 3 is tilted forward is reduced by the amount that the return spring 10 for tilting forward is loosened.
[0029]
The base of the arm 36 that rotates in conjunction with the forward and backward rotation of the upper backrest sheet 4 is fixed to the mounting horizontal shaft 19 at the center of the center folding of the upper backrest sheet 4, and the middle fold detection mechanism 31 is provided. When the arm 36 and the other end 35 of the bell crank 32 are connected to each other, the reversing speed adjusting unit 30 is connected to the center bending detecting mechanism 31. The adjusting unit 30 automatically loosens the return spring 10 for leaning forward, and reduces the speed at which the backrest sheet 3 falls forward.
[0030]
Conversely, when the folded backrest sheet 4 is returned to its original position, the reversing speed adjusting unit 30 automatically tightens the front-falling return spring 10 to reduce the speed at which the backrest sheet 3 falls forward. .
[0031]
Thus, the connection between the reversing speed adjusting unit 30 and the bending detecting mechanism 31 is performed by the rod 37, and the other end 35 of the bell crank 32 is attached to the lower end of the rod 37, and the tip of the arm 36 is attached to the upper end of the rod 37. Are connected to each other, the reversing speed adjusting section 30 and the breakage detecting mechanism 31 are linked to each other.
[0032]
As described above, when the reversing speed adjusting unit 30 formed by the bell crank 32 and the center bending detecting mechanism 31 formed by the arm 36 are connected by the rod 37, when the upper backrest sheet 4 is bent in the middle, the arm 36 is attached to the mounting side. The arm 36 pushes the rod 37 downward, the rod 37 pushes the other end 35 of the bell crank 32, and the one end 33 of the bell crank 32 pushes the other end 16 of the return spring 10 for falling forward. Pushing in the loosening direction switches the elasticity of the forward fall return spring 10 to “weak”.
[0033]
Conversely, when the upper backrest sheet 4 is returned to the normal state, since the elasticity for returning the loosened front-falling return spring 10 to the original position is applied to the rod 37, the middle folding mechanism 20 is unlocked. Then, the restriction of the rod 37 is released, and the upper backrest sheet 4 is returned to the normal state by the elasticity of the return spring 10 for returning to the original position.
[0034]
Therefore, the forward fall return spring 10 also functions as a return spring for the upper backrest sheet 4 via the rod 37.
[0035]
Thus, one end 11 of a front fall return spring 10 that constantly urges the backrest sheet 3 to fall forward is locked to the rotation center shaft 14, and the other end 16 of the front fall return spring 10 is locked. Is fixed to one end 33 of a bell crank 32 rotatably provided on the lower back frame 12 of the lower back seat 5 by a horizontal shaft 34, and the lower end of a rod 37 is attached to the other end 35 of the bell crank 32. Since the upper end of the mounting rod 37 is attached to the tip of an arm 36 having a base fixed to the mounting horizontal shaft 19, the bell back 32, the rod 37 and the arm 36 constitute the middle back link 40 of the upper backrest seat 4. Yes, and can be configured at low cost.
[0036]
That is, when the upper backrest sheet 4 is tilted forward, the arm 36 is rotated forward and the rod 37 is arranged to move downward, and between the lower end of the rod 37 and the other end 33 of the tilting return spring 10. Is provided with the bell crank 32, so that the rotation of the arm 36 is converted by the bell crank 32, and the return spring 10 for falling forward can be loosened.
[0037]
Further, since the arm 36 and the spring 10 are connected by the middle bending link 40, the center bending mechanism 20 is unlocked to return the middle back folded upper backrest sheet 4 to the normal state. 32, the other end 16 of the spring 10, which has been forcibly moved in the loosening direction by the bell crank 32, returns to the original position, whereby the rod 37 moves upward, and the rod 37 moves upward. 37 rotates the arm 36, and the arm 36 rotates the mounting horizontal shaft 19 to return the upper backrest sheet 4 to the normal state.
[0038]
【effect】
According to the present invention, a backrest seat 3 is provided on a seat 2 provided on a vehicle body side so that the backrest seat 3 can be tilted freely by being rotated back and forth about a rotation center shaft 14 via a reclining device R, and the backrest seat 3 is an upper backrest. The upper backrest sheet 4 is divided vertically into a seat 4 and a lower backrest sheet 5, and the upper backrest sheet 4 is attached to the lower backrest sheet 5 via a folding mechanism 20 so as to be rotatable back and forth about a mounting horizontal axis 19. In the seat, a return spring 10 is provided between the seat 2 and the lower backrest sheet 5 so as to always urge the backrest sheet 3 to fall forward. A reversing speed adjusting unit 30 for mechanically switching the strength of the elasticity of the front-falling return spring 10, wherein the reversing speed adjusting unit 30 is configured to mechanically detect the middle folding state of the upper backrest frame 18. The return spring 1 for falling forward by the detection mechanism 31 In this case, the reversing speed adjustment unit 30 can switch the strength of the elasticity of the front-falling return spring 10 by means of the center-bending detection mechanism 31 so as to switch the strength of the seated person. Can be prevented from hitting the backrest sheet 3 in an impact manner, and the operability is improved because the operation of the reclining device R and the operation of the center folding mechanism 20 are not given a priority.
According to the present invention, the reversing speed adjusting unit 30 fixes the one end 33 of the bell crank 32 rotatably attached to the lower backrest sheet 5 by the horizontal shaft 34 and the one end 11 to the rotation center shaft 14. Since the vehicle seat is configured by being attached to the other end 16 of the attached front-falling return spring 10, the reversing speed adjusting unit 30 can be configured by a mechanical configuration, reducing cost and ensuring operation. The operability is improved by eliminating the need for electric power.
In the present invention, the center-break detecting mechanism 31 is constituted by an arm 36 having a base fixed to the mounting horizontal shaft 19, and the other end of the arm 36 and the bell crank 32 constituting the reversing speed adjusting unit 30. Since the end 35 is connected to the vehicle seat, the center-bending detecting mechanism 31 can be configured by a mechanical structure, thereby reducing costs, ensuring operation, and eliminating the need for electric power to improve operability. Let it.
According to the present invention, the distal end of the arm 36 and the other end 35 of the bell crank 32 constituting the reversing speed adjusting section 30 are connected by a rod 37, so that the elasticity of the return spring 10 for falling forward decreases the upper back seat. 4 is a vehicle seat configured to also serve as a return spring for returning to the normal state, so that the front-falling return spring 10 can also be used as a spring for returning the middle bend of the upper backrest sheet 4, further reducing costs. Can be lowered.
According to the present invention, a backrest seat 3 is provided on a seat 2 provided on a vehicle body side so that the backrest seat 3 can be tilted freely by being rotated back and forth about a rotation center shaft 14 via a reclining device R, and the backrest seat 3 is an upper backrest. The upper backrest sheet 4 is divided vertically into a seat 4 and a lower backrest sheet 5, and the upper backrest sheet 4 is attached to the lower backrest sheet 5 via a folding mechanism 20 so as to be rotatable back and forth about a mounting horizontal axis 19. In the seat, one end 11 of a front-falling return spring 10 that constantly urges the backrest sheet 3 to fall forward is locked to the rotation center shaft 14, and the other end 16 of the front-falling return spring 10 is locked. Is fixed to one end 33 of a bell crank 32 rotatably provided on the lower back frame 12 of the lower back seat 5 by a horizontal shaft 34, and the lower end of a rod 37 is attached to the other end 35 of the bell crank 32. Attach the upper end of the rod 37 to the attachment horizontal axis 19 Since the vehicle seat is attached to the end of the arm 36 having the fixed portion, the strength of the front-falling return spring 10 can be switched by the bending of the upper backrest sheet 4, and the seat can be placed on the back of the seated person. The backrest sheet 3 can be prevented from being hit by impact, and the operability is improved because there is no priority between the operation of the reclining device R and the operation of the folding mechanism 20, and the cost is reduced by the mechanical structure. Lowering, ensuring operation, eliminating the need for electric power, and improving operability.
[Brief description of the drawings]
FIG. 1 is a side view of a seat in a normal sitting state.
FIG. 2 is a side view of a backrest seat frame and a seat frame in a normal sitting state.
FIG. 3 is a side view of a center bending state by a center bending mechanism.
FIG. 4 is a side view of a full flat mode.
FIG. 5 is a side view of the backrest sheet in a folded state.
FIG. 6 is a side view of the backrest sheet in a front-folded state in a center-folded state.
FIG. 7 is a side view of the backrest seat frame and the seat frame in a folded state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Seat seat, 3 ... Backrest seat, 4 ... Upper backrest seat, 5 ... Lower backrest seat, 10 ... Front fall return spring, 11 ... One end, 12 ... Lower backrest frame, 13: seat frame, 14: rotation center axis, 16: other end, 18: upper backrest frame, 19: mounting horizontal axis, 20: center bending mechanism, 30: reversing speed adjusting unit, 31: center bending detection mechanism, 32 ... bell crank, 33 ... one end, 34 ... horizontal axis, 35 ... other end, 36 ... arm, 37 ... rod, 40 ... middle bending interlocking link.

Claims

The backrest seat 3 is provided on the seat 2 provided on the vehicle body side by tilting back and forth about a rotation center shaft 14 via a reclining device R so that the backrest seat 3 can be tilted freely. The upper backrest sheet 4 is vertically divided and formed on the backrest sheet 5, and the upper backrest sheet 4 is attached to the lower backrest sheet 5 via a folding mechanism 20 so as to be rotatable back and forth around a horizontal axis 19. A return spring 10 is provided between the seat 2 and the lower backrest sheet 5 so as to always bias the backrest sheet 3 to fall forward. A reversing speed adjusting unit 30 for mechanically switching the elasticity of the return spring 10 is provided, and the reversing speed adjusting unit 30 is provided by a center bending detecting mechanism 31 for mechanically detecting the state in which the upper backrest frame 18 is bent. The elasticity of the return spring 10 Configuration the vehicle seat so as to switch the weak.

The reversing speed adjusting unit 30 according to claim 1, wherein one end 33 of a bell crank 32 rotatably mounted on the lower backrest sheet 5 by a horizontal shaft 34 and one end 11 of the bell crank 32 are fixed. A vehicle seat configured to be attached to the other end 16 of the front-falling return spring 10 attached to the vehicle.

In the first or second aspect, the center fold detecting mechanism 31 is configured by an arm 36 having a base fixed to the mounting horizontal shaft 19, and includes a tip of the arm 36 and the reversing speed adjusting unit 30. A vehicle seat in which the other end 35 of the bell crank 32 is connected.

4. The front end of the arm 36 and the other end 35 of the bell crank 32 constituting the reversing speed adjusting section 30 are connected by a rod 37, so that the elasticity of the front fall-back spring 10 is increased by the upper backrest. A vehicle seat configured to also serve as a return spring for returning the seat 4 to a normal state.

The backrest seat 3 is provided on the seat 2 provided on the vehicle body side by tilting back and forth about a rotation center shaft 14 via a reclining device R so that the backrest seat 3 can be tilted freely. The upper backrest sheet 4 is vertically divided and formed on the backrest sheet 5, and the upper backrest sheet 4 is attached to the lower backrest sheet 5 via a folding mechanism 20 so as to be rotatable back and forth around a horizontal axis 19. One end 11 of a front-falling return spring 10 that constantly urges the backrest sheet 3 to fall forward is locked to the rotation center shaft 14, and the other end 16 of the front-falling return spring 10 is connected to the lower backrest. A lower end of a rod 37 is attached to one end 33 of a bell crank 32 rotatably provided on a lower backrest frame 12 of the seat 5 by a horizontal shaft 34, and a lower end of a rod 37 is attached to the other end 35 of the bell crank 32. The upper end of the base is fixed to the mounting horizontal shaft 19 Vehicle seat attached to the tip of the arm 36.