JP4231334B2

JP4231334B2 - Stepless angular position adjustment mechanism

Info

Publication number: JP4231334B2
Application number: JP2003141484A
Authority: JP
Inventors: 孝夫小松原; 孟士山根
Original assignee: Namba Press Works Co Ltd; Bizen Hatsujoh Co Ltd
Current assignee: Namba Press Works Co Ltd; Bizen Hatsujoh Co Ltd
Priority date: 2003-05-20
Filing date: 2003-05-20
Publication date: 2009-02-25
Anticipated expiration: 2023-05-20
Also published as: JP2004345374A

Description

【０００１】
【発明の属する技術分野】
本発明は，回動部材の角度位置を無段階で調節する無段階角度位置調節機構に関し，特に座席に回動自在に取り付けられたアームレストを，所望の角度で保持可能な無段階角度位置調節機構に関する。
【０００２】
【従来の技術】
自動車等の車両の座席には，種々のアームレストが取り付けられている。その中には，使用時には，所定角度に保持され，不使用時には座席にそった位置に保持されるアームレストがある。
【０００３】
このようなアームレストは，ラッチ機構が利用され，一旦倒した位置から所望の位置へと回転させると，その位置に保持される。
【０００４】
また，ワンウエイクラッチが使用されたアームレストもある（たとえば，特許文献１を参照）。このアームレストも，一旦倒した位置から所望の位置へと回転させると，その位置に保持される。
【０００５】
【特許文献１】
特許第3088722号公報
【０００６】
【発明が解決しようとする課題】
上記従来のラッチ機構も，ワンウエイクラッチも，傾斜面をもつ歯をもつ歯車ないしカムを使用し，その歯に保持部材が引っかかることで，反転を防止して，その位置にアームレストを保持するもので，そのため，歯と歯の間の位置での反転は防止できず，したがってアームレストは，ステップバイステップでの角度位置調節しかできない。
【０００７】
歯同士の間隔を狭くすることにより滑らかな反転防止を図ることはできるが，歯同士の間隔を狭くすることにも（歯の形状，強度上）限界がある。また，ワンウエイクラッチの場合，歯の傾斜面上でボールが移動できるように，傾斜面の長さをある程度確保する必要があり，任意の位置で反転を防止することができない。
【０００８】
たとえば，車両の座席，特に乗用車の座席は，さまざまな体型の者により利用されるために，アームレストの保持角度は座る者に対応してより任意となることが望ましい。
【０００９】
さらに，ラッチ機構では，歯と保持部材との係合に際して，接触音が必ず生じるために，ラッチ機構を組み込む座席の用途は制限される。
【００１０】
そこで，本発明は，上記課題を解決するためになされたもので，その目的は，回転部材の角度位置を任意に，無段階で調節できる機構を提供することである。
【００１１】
本発明の他の目的は，角度位置の調節のための回転部材の回転に際して接触音の発生しない，上記無段階で角度位置を調節できる機構を提供することである。
【００１２】
さらに，本発明の他の目的は，座席に組み付けられるアームレストに適用できる，上記機構を提供することである。
【００１３】
【課題を解決するための手段】
上記目的を達成する本発明の機構は，第一の軸に対して，回動自在に取り付けられる回動部材の角度位置を無段階で調節する機構であって，
第一の軸に固定される第一のカムと，
第一の軸から離れた地点で，第一の軸と平行に，回動部材に固定される第二の軸と，
第二の軸に対して回動自在に取り付けられる第二のカムと，
第二のカムが，第二の軸を中心に一方の回転の方向に回転するように，第二のカムに回転力を与える回転偏倚部材と，
第二のカムと係合して，回転偏倚部材による第二のカムの一方の回転を制限するための，回動部材に取り付けられる第一の回転制限部材と，
回動部材が，第一の軸を中心に，一方の回転の方向と同じ方向に，第一軸を垂直に通過する第一の基準線から第一の角度だけ回転したとき，第一の回転制限部材による第二のカムの回転制限を解除する解除部材と，を有する。
【００１４】
ここで，第一のカムは，一方の回転の方向と同じ方向の角度にそって，第一の軸からの距離が次第に長くなる外形を有し，第二のカムは，一方の回転の方向の角度にそって，第二の軸からの距離が次第に短くなる外形を有する。
【００１５】
第二のカムは，第一の回転制限部材により，回転偏倚部材による回転が制限されているため，第二のカムと接することがない。そのため，回動部材は，第一の軸を中心に自由に回転できる状態にある。
【００１６】
回動部材が，第一の軸を中心に一方の回転の方向と同じ方向に，第一の軸を垂直に通過する第一の基準線から第一の角度だけ回転すると，解除部材により，第一の回転制限部材による第二のカムの回転制限は解除される。そのとき，第二のカムは回転偏倚部材により一方の回転の方向に回転して，第一のカムに接する
【００１７】
両カムが接すると，第一のカムは，一方の回転の方向と同じ方向の角度にそって，第一の軸からの距離が次第に長くなる外形を有し，第二のカムは，一方の回転の方向の角度にそって，第二の軸からの距離が次第に短くなる外形を有することから，回動部材は，第一の軸を中心に一方の回転の方向と同じ方向への回転が禁止される。逆に，第一の軸を中心に一方の回転の方向と反対の方向への，回動部材の反転は自由となる。
【００１８】
回動部材が反転するとき，第二のカムは，第一の回転制限部材による回転の制限がないため，回転偏倚部材により，第二の軸を中心に第一の回転の方向に回転力が与えられ，両カムは常に接し続ける。
【００１９】
本無段階角度位置調節機構は，さらに，回転偏倚部材による第二のカムの回転を制限する，第一の軸に対して固定される第二の回転制限部材と、第二の回転制限部材と係合するように，第二のカムの側面に設けられた第二の突起部材とを有することができる。この第二の回転制限部材は，回動部材が，解除部材により二つのカムが接した角度位置から，第一の軸を中心に第二の角度だけ，一方の回転の方向と反対の方向に反転したときに，第二の突起部材と係合して，回転偏倚部材による第二のカムの回転を制限する。これにより，第二のカムは，第一のカムから離れる。さらに回動部材が反転しけると，第二のカムが一方の回転の方向と反対の方向に反転して、第二の突起部材が第二の回転制限部材を乗り越え、この乗り越えにより第二の突起部材と第二の回転制限部材との係合は解かれるとともに，第一の回転制限部材は第二のカムと係合して，回転偏倚部材による第二のカムの回転を制限する。これにより，両カムの非接触は維持され，回動部材は第一の軸を中心に回転自在となる。
【００２０】
本無段階角度位置調節機構は，座席のフレームに回転自在に取り付けられるアームレストを所望の位置に保持するために利用することができる。
【００２１】
本発明において，回転偏倚手段は第一の軸のまわりに巻き付けられたとねじりコイルバネであってもよい。そのコイルバネの一端は第一の軸に取り付けられ，他端が第二のカムに取り付けられ，第二のカムを一方の回転の方向に回転力を与える。また，第一の回転制限部材は，第二のカムの側面に設けられる係合片部材と，係合片部材の端部と係合して，回転偏倚部材による第二のカムの回転を制限する，回動部材に取り付けられる弾性片部材とからなってもよい。
【００２２】
さらに，解除部材は，回動部材が第一の角度だけ回転したときに，係合片部材と係合するように，第一のカムの側面に設けられる第一の突起部材であってもよく，回動部材が第一の角度以上に回転すると，突起部材は，係合片部材と弾性片部材との係合を解く。
【００２３】
【発明の実施の形態】
図１は，本発明の無段階角度位置調節機構が適用され，座席に取り付けられたアームレスト装置の，一部分解した斜視図を示す。なお，ここでは，内部機構を示すために，座席シート，アームレストの骨格が示されている。
【００２４】
アームレスト装置10は，アームレスト1を座席のフレーム材2に回転自在に取り付け，通常は，アームレスト１をフレーム材2にそった位置に配置できるようにし，座席に座る者が使用するときに，矢印に示されている方向にアームレスト1を回転させ，所望の位置に保持できるようにするものである。図１においては，アームレスト1内の構成が分かるように，カバーが取り外されている。
【００２５】
アームレスト1内には，以下で説明されるように，無段階で角度位置を調節できる無段階角度位置調節機構20が組み込まれている。
【００２６】
図２は，アームレスト1をフレーム材2に取り付ける組み立て図を示す。図２に示されているように，アームレスト1をフレーム材2に取り付けるための取り付け具4が，複数のネジ5によりフレーム材2（図１）に固定される。アームレスト1は，以下のように，第一の軸3により回転自在に取り付け具4に取り付けられる。
【００２７】
図３は機構20の組み立て図を示す。図２に示されているように，アームレスト1の下方には，円形の開口1’が形成されているが，その開口1’と整合する開口21’をもつプレート21がアームレスト1の内側に固定される。その開口21’内に位置する円筒部22’をもつ円盤部材22が，取り付け具4側に配置される。アームレスト1内で，以下で説明する，回転制限部材23が位置し，さらに，その外側に，第一のカム24が位置し，複数のネジ25により，一体となって，円盤部材22に固定される。この円盤部材22は，取り付け具4に固定される。さらに，円盤部材22，回転制限部材23，第一のカム24を貫いて，第一の軸3が円筒体3’を介して取り付け具4に取り付けられる。
【００２８】
プレート21は，円盤部材22の円筒部22’に位置することから，回転自在であり，したがって，アームレスト1も円筒部22’，すなわち，フレーム材2に固定された円盤部材22（第一の軸3）に対して回転自在となる。
【００２９】
回転制限部材23は円形部材であるが，外側に突き出る係合片23’を有する。
【００３０】
第一のカム24は，フレーム材2に固定された円盤部材22に固定されることから，第一の軸3に対して固定されるが，図１の矢印の回転方向への角度にそって，第一の軸3からの距離が次第に長くなる外形をもつ。さらに，第一のカム24の側面には，以下で説明する解除部材となる円形の第一の突起部材26がネジ27により固定されている。
【００３１】
アームレスト1に固定されたプレート21にはさらに，第一の軸3から離れた位置に第二の軸30が固定されている。その第二の軸30に対して，第二のカム31が回転自在に取り付けられる。
【００３２】
ここで，第二のカム31は，互いに外周面で接することができるように，第一のカム24と同一平面内にあるように配置される。この第二のカム31は，第二の軸30を中心に，図１の矢印の方向と同じ回転の方向（これを一方の回転の方向という）の角度にそって，第二の軸からの距離が次第に短くなる外形を有する。
【００３３】
第二のカム31には，一方の回転の方向に第二の軸30を中心として回転力を与えるための，回転偏倚部材34が設けられる。この回転偏倚部材34は，第二の軸30を取り巻くねじりコイルバネであり，その一端が第二のカム31に形成されて穴に挿入され，他端が第二の軸30に設けられたピン30’に引っかけられ，常に，第二のカムに回転力を与える。
【００３４】
以下で説明するように回転偏倚部材34による第二のカム31の回転を制限し，アームレスト1を第一の軸3を中心に自由な回転を可能にするための，第一の回転制限部材40がアームレスト1内に設けられる（回転制限部材23は，以下第二の回転制限部材23という）。
【００３５】
この第一の回転制限部材40は，第二のカム31の側面にネジ41により固定される係合片部材42と，プレート21に設けられた取り付けプレート44に，ネジ45により固定される弾性片部材46とからなる。弾性片部材46は図４，図５に示されているように，折れ曲がった先端部46’を有する。弾性片部材46の先端部46’が，（図４および図５に示されているように）係合片部材42の一端側（図面では，右側面）と接すると，回転偏倚部材34による第二のカム31の回転は制限される。逆に，弾性片部材46と係合片部材42との係合が解かれると，第二のカム31は，回転偏倚部材34により第二の軸30を中心に，一方の回転の方向に回転可能となる。
【００３６】
第二のカム31の裏面（係合片部材42が取り付けられている面の反対側の面）に，円筒形の第二の突起部材47がネジ48により取り付けられている。この第二の突起部材47は，以下で説明するように，第二の回転制限部材23の係合片23’と係合することで，回転偏倚部材34による第二のカムの回転を制限するものである。
【００３７】
第一の軸3と第二の軸30とは，好適に，連結片49により連結され，軸同士の間隔が維持される。
【００３８】
図４および図５を参照して，無段階角度位置調節機構が組み込まれたアームレスト装置10の動作を説明する。
【００３９】
図４は，図１に示されたアームレスト1が，第一の軸3を中心として，たとえば，座席の背もたれ（フレーム材2）にそった位置から，水平な座席の座る面へと，一方の回転の方向と同じ方向に回転するときの，無段階角度位置調節機構20の動作を略示する。
【００４０】
図４において，角度位置は，水平位置からの角度により示される。図４（A）は，水平位置から115度の位置にあるアームレスト1における機構20を略示する。ここで115度は，通常，差席の背もたれは，座席の座る面から115度の位置（標準セット位置）にあることから，背もたれに沿うように，アームレスト1を配置したことによるもので，本機構20がこの角度に制限されるものではない。
【００４１】
図４（A）に示されているように，第一の軸3はアームレストの回転の中心になり，第一のカム24はその第一の軸3を中心に一方の回転の方向と同じ方向の角度にそって，第一の軸3からの距離が長くなる外形をもち，その距離が最も長い位置は，水平の位置より下方になるように，第一の軸3に対して固定されている。その第一のカム24の側面に，解除部材26が取り付けられているが，取り付け位置は，ほぼ水平の角度位置（0度）にある。
【００４２】
固定されている第一のカム24の背面側に，第二の回転制限部材23が，その係合片23’がほぼ90度の角度位置となるように固定されている。この角度位置としたのは，以下で説明するように，アームレスト1が回転自由状態になったとき，不用意に回転して背もたれの位置から座席の座る面側に倒れないようにするためである。
【００４３】
115度の角度位置にあるアームレスト1に固定された第二の軸30と，第一の軸3とを垂直に貫く直線（この位置での直線を第一の基準線という）は，水平の位置から115度の角度位置にある。
【００４４】
第二のカム31は，第二の軸30を中心に，一方の回転の方向の角度にそって，第二の軸30からの距離が短くなる外形をもつものであるが，この実施例では，係合片部材42は，第二の軸30からの距離が最も長くなる第二のカム31の外形状の位置と反対側に伸長するように，第二のカム31の一方の側面に位置する。図４（A）に示されているように，係合片部材42が基準線にそった位置にあるとき（係合部材がこの位置にあると，アームレスト1が第一の軸3を中心に回転しても，カム同士が接することはない），この弾性片部材46の，折り曲げられた端部46’は，係合片部材42の一面（図では右側面）と接し，支持する。その結果，回転偏倚部材43による第二のカム31の回転は制限され，第二のカム31はアームレスト1に対して一体的となる。
【００４５】
弾性片部材46も，アームレスト1に取り付けられており，第二のカム31と第一のカム24と係合しないため，アームレスト1は，第一の軸3に対して回転自在となっている。
【００４６】
第二のカム31の他の側面に設けられる円筒形の第二の突起部材47は，アームレスト1が110度の角度位置へと回転したときに（図４（B）），第二の回転制限部材23の係合片23’と接するところに位置する。この第二の突起部材47と係合片23’との接触により，アームレスト1が110度の角度位置から座席の座る面への回転が制限される（すなわち，アームレスト1が不用意に座席シート側へと前に倒れることが防止される）。かくして，アームレスト1は，角度位置115度と角度位置110度との間は回転自在になる一方，係合片23’と第二の突起部材47とが接する，110度の角度位置（前倒しロック位置）より一方の回転の方向と同じ方向に回転することが防止される。
【００４７】
さらに，アームレスト1を，一方の回転の方向と同じ方向へと強制的に回転させるとき，第二の突起部材47は係合片23’の先端に乗り上げようとし，第二のカム31は，（回転偏倚部材34による回転力に抗して）一方の回転の方向とは反対の方向に回転する。そして，図４（C）に示されているように，さらに，アームレスト1を86度の角度位置まで回転させると，第二の突起部材47は，係合片23’を完全に乗り越える。ことき，アームレスト1の回転を制限するものがなくなることから，アームレスト1は回転自在となる。
【００４８】
このように，アームレスト1に力を加えて回転させないときは，第二の突起部材47が，第一の回転制限部材23の係合片23’と接触して，アームレスト1は前に（座席の座る面へと）倒れることがなく，図４（C）に示されているように，力を加えて，アームレスト1を回転させると第二の突起部材47が係合片23’を乗り越え，再び，アームレスト1は回転自在となる。
【００４９】
アームレスト1を回転させるための力は，突起部材47の位置，形状，係合片23’の長さ，その先端の形状により決定される。
【００５０】
回転自在となったアームレスト1を，さらに一方の回転の方向に回転させ，基準線から所定の角度まで回転させたとき（図４（D）），係合片部材42は，第一のカム24の一方の面に設けられた解除部材26と接する（係合片部材42が解除部材26と接する位置は，第一のカム24上の解除部材26の位置によるが，この例では，限定的ではないが，22度の角度位置で両者が接するように，解除部材26が配置されている）。このときも，二つのカムはまだ接していない。
【００５１】
さらに，アームレスト1を一方の回転の方向と同じ方向に強制的に回転させると，係合片部材42が弾性片部材46の先端46’を押すため，弾性片部材46はたわみ，そして係合片部材42は，弾性片部材46の先端46’を乗り越える。このとき，第一の回転制限部材40による，第二のカム31の回転制限は解除されるため，第二のカム31は，回転偏倚部材であるねじるコイルバネ34により，第二の軸30を中心に，一方の回転の方向に回転し，第一のカム24と接する（図４（E））。
【００５２】
第一のカム24は一方の回転の方向と同じ方向の角度にそって，第一の軸3からの距離が次第に長くなる外形し，さらに，第二のカム31はねじりコイルバネ34による回転力のために，第一のカム24と接し続け，したがって，アームレスト1は，両カムが接したところから，さらに一方の回転の方向と同じ方向に回転することができない。
【００５３】
一方，アームレスト1を，一方の回転の方向と反対の方向に反転させようとするとき，第一のカム24の，第一の軸3から外周面までの距離が，一方の回転の方向と反対の方向の角度にそって短くなることから，第一のカム24はアームレスト1の反転を妨げない。そして，第二のカム31は回転偏倚部材34により，一方の回転の方向に回転力が与えられていることから，常に第一のカム24と接する（したがって，アームレスト1は一方の回転の方向と同じ方向には回転できない）。
【００５４】
図５は，水平位置にあるアームレスト1が第一の軸3を中心として，座席フレーム（フレーム材2）にそった位置へと，一方の回転の方向と反対の方向に反転するときの，無段階角度位置調節機構20の動作を略示する。
【００５５】
図５（a）は，第一の回転制限部材40による第二のカムの回転制限が，解除部材である第一の突起部材26により解除され，二つのカムが接した状態を示す。上述したように，二つのカムが接すると，アームレスト1は，一方の回転の方向と同じ回転の方向に回転することはできないが，反転することはできる。したがって，アームレスト1を反転させていくと，第二の突起部材47は第二の回転制限部材23の係合片23’と接する（図５（b））（この位置は，65度の角度位置である）。
【００５６】
第二のカム31は回転偏倚部材34により，一方の回転の方向に回転力を受けているが，その回転力に抗して，さらにアームレスト1を強制的に反転させると，その反転にしたがって，第二のカム31も一方の回転の方向と反対の方向に反転する。このとき，第二のカム31は第一のカム24から離れ，両者の接触が解除される。そして，アームレスト1が86度の角度位置（図５（c））にくると，第二の突起部材47は，第二の回転制限部材23の係合片23’の先端を乗り上げる位置にくる。
【００５７】
この間，第二のカム31に設けられた係合片部材42は，弾性片部材46の先端46’の他の面（図では右側の面）に接し，そして押す（図５（b））。そして，アームレスト1の反転とともに，係合片部材42は，弾性片部材46をたわませ，そして，先端46’を乗り越え，先端46’の一方の面（図では左側の面）と接し，弾性片部材46により支持される。同時に，第二の突起部材47は，係合片23’の先端を乗り越える（図５（d））。
【００５８】
図４を参照して，機構20の動作を説明したように，弾性片部材46が係合片部材42を接して支持すると，回転偏倚部材34により第二のカム31の回転は制限されることになる。したがって，第二のカム31と第一のカム24との非接触が維持され，110度と115度（図５（e））の角度位置の間，アームレスト1は回転自在となる。
【００５９】
本無段階角度位置調節機構2が組み込まれたアームレスト装置10によって，アームレスト1を任意の角度位置に配置する操作を説明する。
【００６０】
まず，フレーム材2にそった位置にあるアームレスト1を，第一の軸3を中心に，一方の回転の方向と同じ方向に，前倒しロック位置（角度位置：110度）を越えて，解除位置（角度位置：22度）まで回転させる。さらにアームレスト1を回転させて，第一の回転制限部材40による第二のカム31の回転の制限を解除させる。解除したとき，第一のカム24と第二のカム31は接し，アームレスト1はさらに回転できなくなる。
【００６１】
つぎに，所望の位置まで，アームレスト1を反転させる。二つのカムは引き続き接しているために，アームレストは，一方の回転の方向と同じ方向にはもはや回転できないため，その所望の位置に維持される。このように，アームレスト1を，二つのカムが接した位置から，段階的でなく，所望の位置まで単に反転するだけで，アームレスト1の角度位置を調節することができる。
【００６２】
アームレスト1を使用しないときは，アームレスト1を，第二の突起部材47が第二の回転制限部材23の係合片23’に接するまで反転させ，さらに，第一の回転制限部材40が，係合片部材42と接して支持するまで反転させる。
【００６３】
第一の回転制限部材40が，係合片部材42と接して支持すると，回転偏倚部材34により第二のカム31の回転は制限され，二つのカムの非接触が維持され，アームレスト1は回転自由となる。しかし，第二の突起部材47は，第二の回転制限部材23の係合片23’と接触することから，前倒しが防止される。かくして，アームレスト1は，座席の背もたれにそった位置に維持される。
【００６４】
上記の実施例における種々の角度位置は，例示であり，第一および第二の回転制限部材，突起部材，係合片部材に，配置位置や，形状などにより，任意に変えることができることはいうまでもない。
【００６５】
本発明の無段階角度位置調節機構を，アームレスト装置に組み込んだ例をもって説明してきたが，適用例はこれに限定されず，角度調節が必要な装置に組み込むことできることは当業者には明らかであろう。たとえば，座席の背もたれを，任意の角度に傾けるために，本機構は利用できる。
【００６６】
【発明の効果】
本発明にしたがった無段階角度位置調節機構は，中心からの距離が次第に長くなる外形をもつカムと，中心からの距離が次第に短くなる外形をもつカムとを利用し，互いに接するようにすることで，回転自在に取り付けられた回動部材の，一方への回転を制限するとともに，その反転は任意に行うことができ，したがって回動部材を無段階で所定の角度位置に配置でき，さらにその位置に維持することができる。
【００６７】
角度位置の調節のための回動部材の回転に際しては，二つのカムが接し続け，したがって，角度位置の調節のためにはなんら音が発生しない。
【００６８】
カム同士を接触させるために，カムの回転制限を解くことも，カム同士を非接触状態にするために，カムの回転を制限することも，単にアームを所定の角度位置まで回転，または反転することで達成することができる。
【００６９】
本機構は，角度位置を調節する種々の装置，システムに応用することができる。
【図面の簡単な説明】
【図１】図１は，本発明の無段階角度位置調節機構を組み込んだ，座席に取り付けられたアームレスト装置の，一部分解した斜視図を示す。
【図２】図２は，アームレストをフレーム材に取り付ける組み立て図を示す。
【図３】図３は，本発明の無段階角度位置調節機構の組み立て図を示す。
【図４】図４は，アームレストが，フレーム材にそった位置から水平な位置へと回転するときの，無段階角度位置調節機構の動作を略示する。
【図５】図５は，アームレストが，水平な位置からフレーム材にそった位置へと回転するときの，無段階角度位置調節機構の動作を略示する。
【符号の説明】
1 アームレスト
2 フレーム材
3 第一の軸
4 取り付け具
10 アームレスト装置
20 無段階角度位置調節機構
21 プレート
23’ 係合片
24 第一のカム
30 第二の軸
31 第二のカム
49 連結片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stepless angular position adjustment mechanism that adjusts the angular position of a rotating member in a stepless manner, and in particular, a stepless angular position adjustment mechanism that can hold an armrest that is rotatably attached to a seat at a desired angle. About.
[0002]
[Prior art]
Various armrests are attached to seats of vehicles such as automobiles. Among them, there is an armrest that is held at a predetermined angle when in use and held at a position along the seat when not in use.
[0003]
A latch mechanism is used for such an armrest. When the armrest is rotated from a tilted position to a desired position, the armrest is held at that position.
[0004]
There is also an armrest using a one-way clutch (see, for example, Patent Document 1). This armrest is also held at that position once it has been rotated from a tilted position to a desired position.
[0005]
[Patent Document 1]
Japanese Patent No. 3087722 [0006]
[Problems to be solved by the invention]
Both the conventional latch mechanism and the one-way clutch use gears or cams with inclined teeth, and the holding member is caught on the teeth to prevent reversal and hold the armrest in that position. Therefore, inversion at the position between teeth cannot be prevented, and therefore the armrest can only be adjusted angularly step by step.
[0007]
Although smooth inversion prevention can be achieved by narrowing the spacing between teeth, there is a limit to narrowing the spacing between teeth (in terms of tooth shape and strength). In the case of the one-way clutch, it is necessary to secure a certain length of the inclined surface so that the ball can move on the inclined surface of the tooth, and it is impossible to prevent reversal at an arbitrary position.
[0008]
For example, since vehicle seats, particularly passenger car seats, are used by persons of various body types, it is desirable that the holding angle of the armrest be more arbitrary according to the person who sits.
[0009]
Further, in the latch mechanism, since a contact sound is always generated when the teeth and the holding member are engaged, the use of the seat incorporating the latch mechanism is limited.
[0010]
Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mechanism that can arbitrarily and continuously adjust the angular position of the rotating member.
[0011]
Another object of the present invention is to provide a mechanism capable of adjusting the angular position in a stepless manner so that no contact sound is generated when the rotating member is rotated for adjusting the angular position.
[0012]
Furthermore, the other object of this invention is to provide the said mechanism applicable to the armrest assembled | attached to a seat.
[0013]
[Means for Solving the Problems]
The mechanism of the present invention that achieves the above object is a mechanism that continuously adjusts the angular position of a rotating member that is rotatably attached to a first shaft,
A first cam fixed to the first shaft;
A second axis fixed to the pivoting member at a point away from the first axis, parallel to the first axis;
A second cam that is pivotally attached to a second axis;
A rotational biasing member that applies a rotational force to the second cam so that the second cam rotates in the direction of one rotation about the second axis;
A first rotation limiting member attached to the rotating member for engaging with the second cam and limiting one rotation of the second cam by the rotation biasing member;
When the pivoting member is rotated about a first axis by a first angle from a first reference line passing perpendicularly through the first axis in the same direction as one direction of rotation, the first rotation And a release member for releasing the rotation restriction of the second cam by the restriction member.
[0014]
Here, the first cam has an outer shape in which the distance from the first axis gradually increases along the same angle as the direction of the one rotation, and the second cam has the direction of the one rotation. The outer shape is such that the distance from the second axis gradually decreases along the angle.
[0015]
The second cam is not in contact with the second cam because the rotation by the rotation biasing member is restricted by the first rotation restricting member. Therefore, the rotating member is in a state where it can freely rotate around the first axis.
[0016]
When the pivoting member rotates about the first axis in the same direction as one of the rotations by the first angle from the first reference line passing perpendicularly through the first axis, the release member The rotation limitation of the second cam by the one rotation limiting member is released. At that time, the second cam is rotated in one direction of rotation by the rotation biasing member and comes into contact with the first cam.
When both cams come into contact, the first cam has an outer shape that gradually increases in distance from the first axis along the same angle as the direction of rotation of one of the two cams. Since the rotation member has an outer shape whose distance from the second axis gradually decreases along the angle of the rotation direction, the rotating member can rotate in the same direction as the direction of one rotation around the first axis. It is forbidden. On the contrary, the rotating member can be freely reversed in the direction opposite to the direction of one rotation around the first axis.
[0018]
When the rotating member is reversed, the second cam is not restricted by the first rotation restricting member, so that the rotational biasing member causes a rotational force in the first rotation direction about the second axis. Given, both cams always touch.
[0019]
The stepless angular position adjusting mechanism further includes a second rotation limiting member fixed to the first shaft for limiting rotation of the second cam by the rotation biasing member , a second rotation limiting member, A second projecting member provided on a side surface of the second cam so as to be engaged can be provided. The second rotation restricting member is configured so that the rotating member moves in a direction opposite to the direction of one rotation from the angular position where the two cams are in contact with each other by the release member by a second angle around the first axis. When reversed, it engages with the second projecting member to limit the rotation of the second cam by the rotation biasing member. As a result, the second cam moves away from the first cam. Further rotation member is reversed kick and second cam is reversed in a direction opposite to the direction of one of the rotation, the second projection member over the second rotation restriction member, the second by this overcame The protrusion member and the second rotation restricting member are disengaged, and the first rotation restricting member is engaged with the second cam to restrict the rotation of the second cam by the rotation biasing member. Thereby, the non-contact of both cams is maintained, and the rotating member is rotatable about the first axis.
[0020]
The stepless angular position adjusting mechanism can be used to hold an armrest that is rotatably attached to a seat frame in a desired position.
[0021]
In the present invention, the rotational biasing means may be a torsion coil spring wound around the first axis. One end of the coil spring is attached to the first shaft, the other end is attached to the second cam, and a rotational force is applied to the second cam in the direction of one rotation. The first rotation restricting member engages with an engagement piece member provided on a side surface of the second cam and an end of the engagement piece member to restrict the rotation of the second cam by the rotation biasing member. And an elastic piece member attached to the rotating member.
[0022]
Further, the release member may be a first projecting member provided on a side surface of the first cam so that the release member engages with the engagement piece member when the rotation member rotates by the first angle. When the rotating member rotates more than the first angle, the projecting member releases the engagement between the engagement piece member and the elastic piece member.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partially exploded perspective view of an armrest device attached to a seat to which the stepless angular position adjusting mechanism of the present invention is applied. Here, in order to show the internal mechanism, the seat seat and the skeleton of the armrest are shown.
[0024]
The armrest device 10 is attached to the frame material 2 of the seat so that the armrest 1 can be freely rotated, and is normally arranged so that the armrest 1 can be positioned along the frame material 2. The armrest 1 is rotated in the direction shown so that it can be held in a desired position. In FIG. 1, the cover is removed so that the configuration inside the armrest 1 can be seen.
[0025]
As will be described below, a stepless angular position adjustment mechanism 20 that can adjust the angular position steplessly is incorporated in the armrest 1.
[0026]
FIG. 2 shows an assembly diagram for attaching the armrest 1 to the frame member 2. As shown in FIG. 2, an attachment 4 for attaching the armrest 1 to the frame material 2 is fixed to the frame material 2 (FIG. 1) by a plurality of screws 5. The armrest 1 is attached to the attachment 4 so as to be rotatable by the first shaft 3 as follows.
[0027]
FIG. 3 shows an assembly view of the mechanism 20. As shown in FIG. 2, a circular opening 1 ′ is formed below the armrest 1. A plate 21 having an opening 21 ′ aligned with the opening 1 ′ is fixed inside the armrest 1. Is done. A disk member 22 having a cylindrical portion 22 ′ located in the opening 21 ′ is arranged on the mounting tool 4 side. In the armrest 1, a rotation restricting member 23, which will be described below, is located. Further, a first cam 24 is located outside the armrest 1, and is fixed to the disk member 22 by a plurality of screws 25. The This disk member 22 is fixed to the fixture 4. Further, the first shaft 3 is attached to the fixture 4 through the cylindrical body 3 ′ through the disk member 22, the rotation limiting member 23, and the first cam 24.
[0028]
Since the plate 21 is located at the cylindrical portion 22 ′ of the disk member 22, it can be rotated. Therefore, the armrest 1 is also fixed to the cylindrical portion 22 ′, that is, the disk member 22 (first shaft). 3) It can rotate freely.
[0029]
The rotation limiting member 23 is a circular member, but has an engagement piece 23 ′ protruding outward.
[0030]
The first cam 24 is fixed to the first shaft 3 because it is fixed to the disk member 22 fixed to the frame material 2, but along the angle of the arrow in FIG. , Has an outer shape in which the distance from the first shaft 3 is gradually increased. Further, a circular first projection member 26 serving as a release member described below is fixed to the side surface of the first cam 24 by screws 27.
[0031]
Further, a second shaft 30 is fixed to the plate 21 fixed to the armrest 1 at a position away from the first shaft 3. A second cam 31 is rotatably attached to the second shaft 30.
[0032]
Here, the second cams 31 are arranged so as to be in the same plane as the first cam 24 so that they can contact each other on the outer peripheral surface. The second cam 31 is centered on the second shaft 30 along the angle of the same direction of rotation as that shown by the arrow in FIG. It has an outer shape whose distance is gradually shortened.
[0033]
The second cam 31 is provided with a rotation biasing member 34 for applying a rotational force about the second shaft 30 in the direction of one rotation. The rotation biasing member 34 is a torsion coil spring surrounding the second shaft 30, one end of which is formed in the second cam 31 and inserted into the hole, and the other end is a pin 30 provided on the second shaft 30. It is hooked by 'and always gives a rotational force to the second cam.
[0034]
As described below, a first rotation restricting member 40 for restricting the rotation of the second cam 31 by the rotation biasing member 34 and enabling the armrest 1 to freely rotate around the first shaft 3. Is provided in the armrest 1 (the rotation limiting member 23 is hereinafter referred to as a second rotation limiting member 23).
[0035]
The first rotation limiting member 40 includes an engagement piece member 42 fixed to the side surface of the second cam 31 by a screw 41 and an elastic piece fixed to the mounting plate 44 provided on the plate 21 by a screw 45. Member 46. As shown in FIGS. 4 and 5, the elastic piece member 46 has a bent end portion 46 ′. When the distal end portion 46 ′ of the elastic piece member 46 is in contact with one end side (right side surface in the drawing) of the engagement piece member 42 (as shown in FIGS. 4 and 5), the rotation bias member 34 causes The rotation of the second cam 31 is limited. On the contrary, when the elastic piece member 46 and the engagement piece member 42 are disengaged, the second cam 31 is rotated in the direction of one rotation around the second shaft 30 by the rotation biasing member 34. It becomes possible.
[0036]
A cylindrical second protrusion member 47 is attached to the back surface of the second cam 31 (the surface opposite to the surface on which the engagement piece member 42 is attached) with a screw 48. As will be described below, the second projecting member 47 engages with the engagement piece 23 ′ of the second rotation limiting member 23 to limit the rotation of the second cam by the rotation biasing member 34. Is.
[0037]
The first shaft 3 and the second shaft 30 are preferably connected by a connecting piece 49, and the distance between the shafts is maintained.
[0038]
With reference to FIGS. 4 and 5, the operation of the armrest device 10 incorporating the stepless angular position adjusting mechanism will be described.
[0039]
FIG. 4 shows that the armrest 1 shown in FIG. 1 is centered on the first axis 3, for example, from the position along the seat back (frame material 2) to the seating surface of the horizontal seat. The operation of the stepless angular position adjustment mechanism 20 when rotating in the same direction as the direction of rotation is schematically shown.
[0040]
In FIG. 4, the angular position is indicated by the angle from the horizontal position. FIG. 4A schematically shows the mechanism 20 in the armrest 1 at a position 115 degrees from the horizontal position. Here, 115 degrees is due to the fact that the backrest of the differential seat is at a position of 115 degrees from the seating surface (standard set position), so the armrest 1 is arranged along the backrest. The mechanism 20 is not limited to this angle.
[0041]
As shown in FIG. 4 (A), the first shaft 3 is the center of rotation of the armrest, and the first cam 24 is in the same direction as the direction of one rotation about the first shaft 3. Is fixed to the first axis 3 so that the position where the distance from the first axis 3 becomes longer and the longest distance is lower than the horizontal position. Yes. The release member 26 is attached to the side surface of the first cam 24, and the attachment position is at a substantially horizontal angular position (0 degrees).
[0042]
On the back side of the fixed first cam 24, the second rotation limiting member 23 is fixed so that the engaging piece 23 'is at an angular position of approximately 90 degrees. The reason for this angular position is to prevent the armrest 1 from rotating inadvertently and falling from the position of the backrest to the seating side as described below. .
[0043]
The straight line that passes perpendicularly through the second axis 30 fixed to the armrest 1 at an angular position of 115 degrees and the first axis 3 (the straight line at this position is called the first reference line) is the horizontal position. Is at an angular position of 115 degrees.
[0044]
The second cam 31 has an outer shape in which the distance from the second shaft 30 is shortened along the angle of one rotation direction around the second shaft 30, but in this embodiment, The engaging piece member 42 is positioned on one side surface of the second cam 31 so as to extend to the opposite side of the outer shape position of the second cam 31 having the longest distance from the second shaft 30. To do. As shown in FIG. 4A, when the engaging piece member 42 is in a position along the reference line (when the engaging member is in this position, the armrest 1 is centered on the first shaft 3). The cams do not come into contact with each other even when rotated), and the bent end portion 46 ′ of the elastic piece member 46 is in contact with and supported by one surface (right side surface in the drawing) of the engagement piece member. As a result, the rotation of the second cam 31 by the rotation biasing member 43 is limited, and the second cam 31 is integrated with the armrest 1.
[0045]
Since the elastic piece member 46 is also attached to the armrest 1 and does not engage with the second cam 31 and the first cam 24, the armrest 1 is rotatable with respect to the first shaft 3.
[0046]
The cylindrical second projecting member 47 provided on the other side surface of the second cam 31 has a second rotation restriction when the armrest 1 is rotated to an angular position of 110 degrees (FIG. 4B). The member 23 is located in contact with the engagement piece 23 '. The contact between the second projecting member 47 and the engagement piece 23 'restricts the rotation of the armrest 1 from the 110 degree angle position to the seating surface (that is, the armrest 1 is inadvertently moved to the seat seat side). To prevent them from falling forward). Thus, the armrest 1 is rotatable between an angular position of 115 degrees and an angular position of 110 degrees, while an angular position of 110 degrees (forward-locking position) where the engagement piece 23 ′ and the second projecting member 47 are in contact with each other. ) Is prevented from rotating in the same direction as one of the rotation directions.
[0047]
Furthermore, when the armrest 1 is forcibly rotated in the same direction as the one direction of rotation, the second projecting member 47 tries to ride on the tip of the engagement piece 23 ′, and the second cam 31 It rotates in a direction opposite to the direction of one rotation (against the rotational force of the rotational biasing member 34). Then, as shown in FIG. 4C, when the armrest 1 is further rotated to an angular position of 86 degrees, the second projecting member 47 completely gets over the engagement piece 23 ′. In this case, since there is no restriction on the rotation of the armrest 1, the armrest 1 is rotatable.
[0048]
Thus, when the armrest 1 is not rotated by applying a force, the second projecting member 47 comes into contact with the engagement piece 23 ′ of the first rotation limiting member 23, and the armrest 1 is moved forward (the seat As shown in FIG. 4 (C), when the armrest 1 is rotated by applying force, the second projecting member 47 gets over the engaging piece 23 ' ， The armrest 1 becomes rotatable.
[0049]
The force for rotating the armrest 1 is determined by the position and shape of the protruding member 47, the length of the engagement piece 23 ', and the shape of the tip thereof.
[0050]
When the armrest 1 that has become rotatable is further rotated in the direction of one rotation and rotated from the reference line to a predetermined angle (FIG. 4D), the engagement piece member 42 is moved to the first cam 24. (The position at which the engagement piece member 42 contacts the release member 26 depends on the position of the release member 26 on the first cam 24. However, in this example, the position is limited. The release member 26 is arranged so that the two come into contact with each other at an angular position of 22 degrees). At this time, the two cams are not yet in contact.
[0051]
Further, when the armrest 1 is forcibly rotated in the same direction as one of the directions of rotation, the engaging piece member 42 pushes the tip 46 'of the elastic piece member 46, so that the elastic piece member 46 bends and the engaging piece The member 42 gets over the tip 46 'of the elastic piece member 46. At this time, since the rotation limitation of the second cam 31 by the first rotation limiting member 40 is released, the second cam 31 is centered on the second shaft 30 by the torsion coil spring 34 which is a rotation biasing member. Then, it rotates in one direction of rotation and comes into contact with the first cam 24 (FIG. 4E).
[0052]
The first cam 24 has an outer shape in which the distance from the first shaft 3 gradually increases along an angle in the same direction as one of the directions of rotation, and the second cam 31 has a rotational force generated by the torsion coil spring 34. Therefore, the armrest 1 continues to be in contact with the first cam 24, and therefore, the armrest 1 cannot further rotate in the same direction as one of the directions of rotation from where the two cams are in contact.
[0053]
On the other hand, when trying to reverse the armrest 1 in the direction opposite to the direction of one rotation, the distance from the first shaft 3 to the outer peripheral surface of the first cam 24 is opposite to the direction of one rotation. Accordingly, the first cam 24 does not prevent the armrest 1 from being reversed. The second cam 31 is always in contact with the first cam 24 because the rotational biasing member 34 gives a rotational force in one direction of rotation (the armrest 1 is therefore in contact with the direction of one rotation). Cannot rotate in the same direction).
[0054]
FIG. 5 shows the state when the armrest 1 in the horizontal position reverses in the direction opposite to the direction of one rotation to the position along the seat frame (frame material 2) around the first axis 3. The operation of the step angle position adjustment mechanism 20 is schematically shown.
[0055]
FIG. 5A shows a state in which the rotation limitation of the second cam by the first rotation limiting member 40 is released by the first projecting member 26 that is the releasing member, and the two cams are in contact with each other. As described above, when the two cams come into contact with each other, the armrest 1 cannot rotate in the same direction as one of the rotations, but can be reversed. Therefore, when the armrest 1 is reversed, the second projecting member 47 comes into contact with the engaging piece 23 'of the second rotation restricting member 23 (FIG. 5B) (this position is an angular position of 65 degrees). Is).
[0056]
The second cam 31 receives a rotational force in the direction of one rotation by the rotational biasing member 34. When the armrest 1 is forcibly reversed against the rotational force, The second cam 31 also reverses in the direction opposite to the direction of one rotation. At this time, the second cam 31 is separated from the first cam 24, and the contact between them is released. When the armrest 1 comes to an angular position of 86 degrees (FIG. 5C), the second projecting member 47 comes to a position where the tip of the engagement piece 23 ′ of the second rotation restricting member 23 rides up.
[0057]
During this time, the engaging piece member 42 provided on the second cam 31 contacts and pushes the other surface (the right surface in the figure) of the tip 46 'of the elastic piece member 46 (FIG. 5 (b)). Then, as the armrest 1 is reversed, the engagement piece member 42 bends the elastic piece member 46, gets over the tip 46 ', contacts one surface of the tip 46' (left side in the figure), and elastically Supported by a single member 46. At the same time, the second projecting member 47 gets over the tip of the engaging piece 23 '(FIG. 5 (d)).
[0058]
As described with reference to FIG. 4, when the elastic piece member 46 supports the engagement piece member 42 in contact with the mechanism 20, the rotation of the second cam 31 is limited by the rotation biasing member 34. become. Therefore, the non-contact between the second cam 31 and the first cam 24 is maintained, and the armrest 1 is rotatable between the angular positions of 110 degrees and 115 degrees (FIG. 5 (e)).
[0059]
An operation for arranging the armrest 1 at an arbitrary angular position by the armrest device 10 in which the stepless angular position adjusting mechanism 2 is incorporated will be described.
[0060]
First, the armrest 1 at a position along the frame material 2 is moved forward in the same direction as one of the rotations about the first shaft 3 and beyond the lock position (angular position: 110 degrees), and the release position Rotate to (angular position: 22 degrees). Further, the armrest 1 is rotated to release the limitation on the rotation of the second cam 31 by the first rotation limiting member 40. When released, the first cam 24 and the second cam 31 are in contact with each other, and the armrest 1 can no longer rotate.
[0061]
Next, the armrest 1 is reversed to a desired position. Since the two cams are still in contact, the armrest is no longer able to rotate in the same direction as one of the rotations and is thus maintained in its desired position. As described above, the angular position of the armrest 1 can be adjusted by simply reversing the armrest 1 from the position where the two cams are in contact to a desired position instead of stepwise.
[0062]
When the armrest 1 is not used, the armrest 1 is inverted until the second projecting member 47 contacts the engagement piece 23 ′ of the second rotation restricting member 23, and the first rotation restricting member 40 is engaged. It is reversed until it comes into contact with and supports the piece member 42.
[0063]
When the first rotation restricting member 40 is supported in contact with the engaging piece member 42, the rotation biasing member 34 restricts the rotation of the second cam 31 and maintains the non-contact of the two cams, and the armrest 1 rotates. Be free. However, since the second projecting member 47 comes into contact with the engagement piece 23 ′ of the second rotation restricting member 23, the forward projection is prevented. Thus, the armrest 1 is maintained in a position along the seat back.
[0064]
The various angular positions in the above embodiment are merely examples, and the first and second rotation restricting members, protrusion members, and engaging piece members can be arbitrarily changed depending on the arrangement position, shape, and the like. Not too long.
[0065]
Although the stepless angular position adjusting mechanism of the present invention has been described with an example incorporated in an armrest device, the application example is not limited to this, and it will be apparent to those skilled in the art that the stepless angular position adjusting mechanism can be incorporated in a device that requires angle adjustment. Let's go. For example, the mechanism can be used to tilt the seat back to any angle.
[0066]
【The invention's effect】
The stepless angular position adjustment mechanism according to the present invention uses a cam having an outer shape whose distance from the center gradually increases and a cam having an outer shape whose distance from the center gradually decreases so as to contact each other. Thus, the rotation of the rotating member that is rotatably mounted can be restricted to one side and the reversal thereof can be arbitrarily performed. Therefore, the rotating member can be arranged steplessly at a predetermined angular position, and Can be maintained in position.
[0067]
When the rotating member is rotated for adjusting the angular position, the two cams are kept in contact with each other, and therefore no sound is generated for adjusting the angular position.
[0068]
Unlocking the cam rotation to bring the cams into contact with each other, restricting the cam rotation to bring the cams into non-contact state, or simply rotating or reversing the arm to a predetermined angular position Can be achieved.
[0069]
This mechanism can be applied to various devices and systems that adjust the angular position.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of an armrest device attached to a seat, which incorporates a stepless angular position adjustment mechanism of the present invention.
FIG. 2 is an assembly diagram for attaching an armrest to a frame material.
FIG. 3 shows an assembly diagram of the stepless angular position adjustment mechanism of the present invention.
FIG. 4 schematically illustrates the operation of the stepless angular position adjustment mechanism when the armrest rotates from a position along the frame material to a horizontal position.
FIG. 5 schematically illustrates the operation of the stepless angular position adjustment mechanism when the armrest rotates from a horizontal position to a position along the frame material.
[Explanation of symbols]
1 Armrest
2 Frame material
3 First axis
4 Fitting
10 Armrest device
20 Stepless angular position adjustment mechanism
21 plates
23 'engagement piece
24 first cam
30 Second axis
31 Second cam
49 connecting piece

Claims

A mechanism for steplessly adjusting the angular position of a rotating member that is rotatably attached to a first axis,
A first cam fixed to the first shaft;
A second shaft fixed to the rotating member at a position away from the first shaft and parallel to the first shaft;
A second cam mounted rotatably with respect to the second shaft;
A rotation biasing member for applying a rotational force to the second cam so that the second cam rotates in the direction of one rotation about the second axis;
A first rotation limiting member attached to the rotating member for engaging the second cam and limiting one rotation of the second cam by the rotation biasing member;
When the rotating member is rotated by a first angle from a first reference line that passes perpendicularly through the first axis in the same direction as the one rotation direction about the first axis, A release member for releasing rotation restriction of the second cam by the first rotation restriction member;
Have
The first cam has an outer shape in which a distance from the first axis is gradually increased along an angle in the same direction as the direction of the one rotation.
The second cam has an outer shape in which a distance from the second shaft is gradually shortened along an angle in the direction of the one rotation.
When the rotation restriction of the second cam is released by the release member, the second cam is rotated in the direction of the one rotation by the rotation biasing member and contacts the first cam ;
However, the stepless angular position adjustment mechanism.

2. The stepless angular position adjusting mechanism according to claim 1, further comprising a second fixed with respect to the first shaft that restricts rotation of the second cam by the first rotation biasing member. A rotation limiting member, and a second projecting member provided on a side surface of the second cam so as to engage with the second rotation limiting member,
When the rotating member is reversed from the angular position where the two cams are in contact with each other by the releasing member by a second angle about the first axis in a direction opposite to the direction of the one rotation. When the second projecting member and the second rotation restricting member are engaged with each other and the rotating member continues to be reversed, the second cam is moved in a direction opposite to the direction of the one rotation. Inverted, the second projecting member gets over the second rotation restricting member, and this overcoming disengages the second projecting member from the second rotation restricting member, and the first projecting member A rotation limiting member is engaged with the second cam to limit the rotation of the second cam by the rotation biasing member;
However, the stepless angular position adjustment mechanism.

A stepless angular position adjustable armrest device for holding an armrest rotatably attached to a seat frame at a desired angular position,
A first cam fixed to a first shaft for rotatably mounting the armrest to the frame;
A second axis fixed to the armrest in a position away from the first axis and parallel to the first axis;
A second cam that is pivotally attached to the second shaft;
A rotation biasing member for applying a rotational force to the second cam so that the second cam rotates in the direction of one rotation about the second axis;
A first rotation limiting member attached to the armrest for engaging the second cam and limiting one rotation of the second cam by the rotation biasing member;
When the armrest rotates about the first axis by a first angle from a first reference line passing perpendicularly through the first axis in the same direction as the one rotation direction, A release member for releasing rotation restriction of the second cam by the first rotation restriction member;
Have
The first cam has an outer shape in which a distance from the first axis is gradually increased along an angle in the same direction as the direction of the one rotation.
The second cam has an outer shape in which a distance from the second axis is gradually shortened along an angle in the direction of the one rotation.
When the rotation restriction of the second cam is released by the release member, the second cam is rotated in the direction of the one rotation by the rotation biasing member and contacts the first cam ;
However, the armrest device.

The armrest device according to claim 3,
A second rotation restricting member fixed to the first shaft for restricting rotation of the second cam by the first rotation biasing member; and engaging with the second rotation restricting member. A second projecting member provided on a side surface of the second cam,
The armrest, the angular position in which the two cams are in contact with the release member, only the second angle about said first axis, when inverted in the opposite direction to the direction of rotation of the one, the When the second protrusion member and the second rotation limiting member are engaged, and the armrest continues to be reversed, the second cam is reversed in the direction opposite to the one rotation direction, The second projecting member gets over the second rotation restricting member, and the engagement between the second projecting member and the second rotation restricting member is released by this climbing, and the first rotation restricting member is Engaging with the second cam to limit the rotation of the second cam by the rotational biasing member;
However, the armrest device.

The armrest device according to claim 3,
The rotation biasing means is a torsion coil spring wound around the first shaft, one end of which is attached to the first shaft, the other end is attached to the second cam, and the second cam An armrest device that applies a rotational force to the cam in the one direction of rotation.

The armrest device according to claim 3,
The first rotation restricting member is engaged with an engagement piece member provided on a side surface of the second cam and an end of the engagement piece member, and the second cam of the second cam by the rotation biasing member is engaged. An armrest device, comprising an elastic piece member attached to the armrest for restricting rotation.

The armrest device according to claim 6,
The release member is a first protrusion member provided on a side surface of the first cam so as to engage with the engagement piece member when the armrest rotates by the first angle,
When the armrest rotates more than the first angle, the first projecting member disengages the engagement piece member from the elastic piece member.