JP3709829B2

JP3709829B2 - Circuit breaker

Info

Publication number: JP3709829B2
Application number: JP2001328649A
Authority: JP
Inventors: 斉西脇; 雅彦岡野
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2001-10-26
Filing date: 2001-10-26
Publication date: 2005-10-26
Anticipated expiration: 2021-10-26
Also published as: JP2003132777A

Description

【０００１】
【発明の属する技術分野】
本発明は、ハンドルリンクと可動接触子ホルダとの間に反転ばねを懸架して開閉操作を行う回路遮断器に関するものである。
【０００２】
【従来の技術】
従来例として、特開昭５９−１９６５２４号に示すものが存在する。このものは、図１８および図１９に示すように、可動枠（フレーム）１８の両側片内面側に、両端が外方に折曲した略コ字形に折曲形成された回転軸（ハンドルリンク）１９の両端側を支持させ、この回転軸に可動アーム（可動接触子ホルダ）１７を支持させ、回転軸と可動アームとの間に引張ばね（反転ばね）２３を懸架している。４はハンドル、６は可動接触子、８は可動接点、１０は固定接点、１３は端子である。
【０００３】
【発明が解決しようとする課題】
上述した回路遮断器にあっては、可動枠１８に支持される回転軸１９が折曲形成されているので、その曲率によって可動枠１８の両側片間の長さを十分に取る必要があり、フレームの両側片間の間隔が大きくなって、器体全体をコンパクト化することが困難であった。また、回転軸自体がハンドル４まで延出する形で折曲形成されているので、反転ばね２３の荷重によって折れないようにするために、軸の径を大きくする必要があり、益々コンパクト化が図れないという問題があった。
【０００４】
本発明は、かかる事由に鑑みて成されたものであり、その目的とするところは、コンパクト化が図れる回路遮断器を提供することにある。
【０００５】
【課題を解決するための手段】
請求項１記載の回路遮断器は、器体と、この器体から一部が突出するハンドルと、このハンドルを支持するハンドルリンクと、このハンドルリンクを回動自在に軸支する両側片及びこの両側片間を連結する連結片を有したフレームと、このフレームの前記両側片に対して前記ハンドルリンクと同一軸線上で回動自在に軸支された可動接触子ホルダと、可動接点を有し可動接触子ホルダに保持された可動接触子と、この可動接触子と前記ハンドルリンクとの間に懸架されて前記ハンドルリンク及び前記可動接触子ホルダの軸支位置を中心に反転する反転ばねと、前記可動接点に接離自在に対向する固定接点を有した固定接触子とを備えた回路遮断器において、
前記フレームの前記両側片の外面から内面方向へ挿通される第１軸部と、この第１軸部を前記両側片に挿通させたときに前記フレームの外面に当接する鍔部と、この鍔部から第１軸部とは反対側に突出する第２軸部とを有する一対の軸部材を、前記フレームの前記両側片の各々に同一軸線上となるように装着し、前記可動接触子ホルダおよび前記ハンドルリンクの一方を第１軸部に軸支するとともに他方を前記第２軸部に軸支したことを特徴とするものである。
【０００６】
請求項１記載の回路遮断器によれば、例えばフレームの両側片間に可動接触子ホルダを配設した状態で軸部材を各両側片の外面から挿通させて第１軸部で可動接触子ホルダを軸支した後、両側片の外側に突出する第２軸部でハンドルリンクを軸支することができる。従って、フレームの内面に突出する第１軸部の突出量を可動接触子ホルダの厚みと同等とすることができ、フレームの内面への突出量を少なくしてフレームの両側片間の間隔を狭くすることができ、もって器体全体のコンパクト化が図れる。また、鍔部がフレームの両側片に当接しているので、第１軸部及び第２軸部の傾きを少なくすることができ、接点の開閉動作への影響を少なくすることができる。さらに、軸部材の鍔部がフレームの両側片とハンドルリンクとの間に介在しているので、軸部材がフレームから外れるのを簡単に防止することができる。
【０００７】
請求項２記載の回路遮断器は、請求項１において、前記フレームをラッチして前記ハンドルのオフ位置からのオン操作により前記ハンドルリンク及び前記可動接触子ホルダの軸支位置を越えて前記可動接点を前記固定接点に接触させる方向に前記反転ばねを位置させるラッチ部材と、このラッチ部材が前記フレームのラッチを解除した状態で前記ハンドルリンク及び前記可動接触子ホルダの軸支位置を越えて前記可動接点を前記固定接点から離すように前記反転ばねを反転させる方向に前記フレームを付勢する開極ばねと、過電流が流れたときに前記ラッチ部材が前記フレームの係止部をラッチしている状態から解放して前記開極ばねにより前記可動接点を前記固定接点から強制開極させる異常電流検出装置とを備え、前記フレームに衝突片を設けるとともに、前記フレームの前記開極ばねによる動作で前記衝突片が衝突して前記可動接触子ホルダが開極方向に押圧される被衝突片を前記可動接触子ホルダに設けたものである。
【０００８】
請求項２記載の回路遮断器によれば、請求項１と同様な効果のほか、異常電流検出装置による異常電流検出によってフレームのラッチ状態が解除されて、フレームが移動する際、衝突片が被衝突片に衝突して可動接触子ホルダも移動させるので、可動接点が固定接点に溶着しにくくなる。
【０００９】
請求項３記載の回路遮断器は、請求項２において、前記器体に、一端側を固定端とするとともに他端側を自由端として前記一端を支点として変形自在に配設された弾性係止部材を配設し、前記弾性係止部材は、前記自由端の両側に当接片及び係止片を二股状に形成するとともに前記当接片及び前記係止片間で前記自由端の端面から所定距離の位置に逃げ部が形成され、前記フレームが前記ラッチ部材にラッチされている状態のときに前記逃げ部に臨む突部を前記フレームに設けるとともに、前記ハンドルが少なくともオン位置にあるときに前記当接片が当接するとともに前記係止片に対向して段差形成され、前記突部が前記逃げ部から移動して前記弾性係止部材を押圧するとき前記係止片に引っ掛かる引掛部を有する延出片を前記ハンドルに設けたものである。
【００１０】
請求項３記載の回路遮断器によれば、請求項２と同様な効果のほか、異常電流検出装置による異常電流検出によってフレームのラッチが解除されるとともに可動接点が固定接点に溶着した際、フレームの衝突片が可動接触子ホルダの被衝突片に衝突してフレームの移動が停止される。このとき、フレームの突部が弾性係止部材の逃げ部から自由端の端面方向に移動するので、当接片とハンドルの延出片の先端とを支点として係止片がハンドル側に近づく。このため、ハンドルをオフ方向に回転しようとすると、ハンドルの引掛部が係止片に係合してそれ以上オフ方向に回転しなくなるので、接点溶着時にハンドルをオフ位置に移動できなくなり、接点の開閉状態とハンドルの開閉状態とを同一にすることができる。
【００１１】
請求項４記載の回路遮断器は、請求項１、請求項２または請求項３において、前記可動接触子が、前記反転ばねを懸架するばね保持片と、基端を前記ばね保持片に連設するとともに先端側に前記可動接点を固着し、前記ばね保持片に反転ばねを懸架した状態で固定接触子方向に付勢された可動接触子本体とを有し、前記可動接触子ホルダは、前記反転ばねのばね力によって前記ばね保持片が当接して前記可動接触子が外れるのを防止する抜け止め部と、反転ばねのばね力によって前記可動接触子本体の可動接点固着面側が当接する可動接触子当接部とが形成されたものである。
【００１２】
請求項４記載の回路遮断器によれば、請求項１、請求項２または請求項３と同様な効果のほか、可動接触子のばね保持片に反転ばねを懸架させた状態でそのまま可動接触子ホルダに嵌め込むと、ばね保持片が抜け止め部に当接するとともに可動接触子本体の可動接点固着面側が可動接触子当接部に当接するので、可動接触子を反転ばねのばね力のみで可動接触子ホルダに保持させることができる。また、反転ばねのばね力によって可動接触子の可動接点が固定接点に接触する方向に付勢されることとなるので、反転ばねを可動接点が固定接点に接触したときの接圧ばねとして兼用することができる。さらに、可動接点が固定接点に接触したときに可動接触子本体が可動接触子当接部から離れる方向に移動できるので、可動接点が固定接点に接触したときのワイピングにより、可動接点を固定接点に確実に接触させることができる。
【００１３】
請求項５記載の回路遮断器は、請求項４において、前記可動接触子ホルダに、前記可勤接触子当接部から前記可動接触子の厚みよりも広い間隔をおいて前記可動接触子本体の可動接点固着面とは反対側面が対向する可動接触子移動防止部を設けたものである。
【００１４】
請求項５記載の回路遮断器によれば、請求項４と同様な効果のほか、可動接点が固定接点に接触した後、反転ばねのばね力で可動接触子本体が可動接触子当接部から離れる方向に移動するが、このとき可動接触子本体が可動接点固着面とは反対側面が可動接触子移動防止部に当接するので、可動接点が固定接点に接触したときに、反転ばねのばね力が可動接触子に直接加わるとともに可動接触子ホルダの可動接触子移動防止部を介して可動接触子に加わることとなる。このため、可動接触子のみ反転ばねのばね力が加わったときと比べて可動接点が固定接点に強い接圧でもって接触することとなる。
【００１５】
請求項６記載の回路遮断器は、請求項１、請求項２、請求項３、請求項４または請求項５において、前記ハンドルリンクのハンドル回転方向における両側に係止部を各々設けるとともに、前記ハンドルの回転方向両側に前記ハンドルリンクの側面側からスライドさせて各係止部に係止される被係止部を各々設け、前記ハンドルを前記ハンドルリンクに係止可能な姿勢に前記ハンドルリンクを前記反転ばねに抗して支持する支持用ピンを受ける切溝を前記フレームに形成したものである。
【００１６】
請求項６記載の回路遮断器によれば、請求項１、請求項２、請求項３、請求項４または請求項５と同様な効果のほか、フレームの切溝に支持用ピンを挿通させておき、この状態で支持用ピンにハンドルリンクを反転させるとハンドルリンクの端面がピンに当接して止まるので、この状態でハンドルリンクにハンドルをスライド取着することができることとなり、ハンドルをハンドルリンクに取着する作業が容易となる。
【００１７】
【発明の実施の形態】
この発明の一実施の形態を図１から図１７により説明する。すなわち、この回路遮断器は、基本的に、器体４５と、ハンドル４６と、可動接触子４７と、固定接触子４８と、作動部材４９と、ラッチ部材５０と、異常電流検出装置５１と、端子５２、５３を有する。
【００１８】
器体４５は、内部に部品収納スペースを有する箱形であって、部品を両側壁５４、５５の対向方向より配設する横嵌め式としている。すなわち、器体４５を両側壁の対向方向に２分割可能に構成し、開いた状態で部品を内部に収納している。なおこの回路遮断器は２極タイプであり、両側壁方向に３分割可能に構成し、中央の分割体４５ａの中央に仕切りを設けてこれを両側壁の一側壁５４とし、両側の分割体４５ｂの各側壁５４、５５間にそれぞれ１極分の部品が収納される。
【００１９】
ハンドル４６は、器体４５から一部が突出し、ハンドルリンク５６にハンドル４６が支持され、器体４５に対して回動自在に保持される。このハンドル４６は２極に共用されるもので、各極のハンドルリンク５６にともに係合する。このため、ハンドルリンク５６のハンドル回転方向における両側に係止部１３０を各々設けるとともに、ハンドル４６の回転方向両側にハンドルリンク５６の側面側からスライドさせて各係止部１３０に係止される被係止部１３１を各々設けている。器体４５の上壁１１５にハンドル穴１１５ａを形成し、ハンドル穴１１５ａからハンドル４６の一部を突出している。
【００２０】
作動部材４７は、ラッチされる係止部５７を有して可動接点５８が固定接点５９に接触した状態におけるリンク機構の均衡を崩す方向に付勢されている。リンク機構は、ハンドルリンク５６と、可動接触子ホルダ６０と、反転ばね６１を有する。作動部材４７はハンドルリンク５６を回動自在に軸支する両側片６２及びこの両側片６２間を連結する連結片６３を有したフレーム６４を具備する。可動接触子ホルダ６０はフレーム６４の両側片６２に対してハンドルリンク５６と同一軸線上で回動自在に軸支されている。すなわち、フレーム６４の両側片６２に形成した孔６２ａに外面から内面方向へ挿通される第１軸部６６と、この第１軸部６６を両側片６２に挿通させたときにフレーム６４の外面に当接する鍔部６７と、この鍔部６７から第１軸部６６とは反対側に突出する第２軸部６８とを有する一対の軸部材６９を、フレーム６４の両側片６２の各々に同一軸線上となるように装着し、可動接触子ホルダ６０を第１軸部６６に軸支するとともにハンドルリンク５６を第２軸部６８に軸支している。反転ばね６１は可動接触子４８とハンドルリンク５６との間に懸架されてハンドルリンク５６及び可動接触子ホルダ６０の軸支位置を中心に反転する。
【００２１】
またフレーム６４の側片６２に形成した孔６２ｂと器体４５の一側壁５４に形成した孔７０間に例えばねじりコイルばねを用いた開極ばね７１の両端を嵌合し、これにより作動部材４７をリンク機構の均衡を崩す方向に付勢している。すなわち、開極ばね７１はラッチ部材５０がフレーム６４のラッチを解除した状態で反転ばね６１がハンドルリンク５６及び可動接触子ホルダ６０の軸支位置を越えて可動接点５８を固定接点５９から離すように反転ばね６１を反転させる方向にフレーム６４を付勢する。
【００２２】
一方上記のハンドルリンク５６は、作動部材４７よりも広幅に対向する幅をもった略コ字形の部材であり、第２軸部６８に軸支される軸受け７７を下端に切欠き形成し、それと反対側の上端に反転ばね６１の上端を受けるように略逆への字形に折曲したばね受けピン７８を支持する受け部７９を切欠き形成している。
【００２３】
さらに可動接触子ホルダ６０は、作動部材４７のフレーム６４の両側片６２間に挿入できる幅に対向した一対の側片８１、８２とこれらを連結する連結片８３からなる。一対の側片８１、８２の上端部に第１軸部６６に嵌合する軸受け８５を孔により形成し、連結片８３に可動接触子４８の反転ばね６１を受けるばね保持片７５を抜止め嵌合する抜け止め部８４を切欠き形成している。可動接触子ホルダ６０は、反転ばね６１のばね力によって抜け止め部８４にばね保持片７５が当接嵌合して可動接触子４８が外れるのを防止する。そして、反転ばね６１のばね力によって可動接触子本体７６の可動接点固着面側が当接する可動接触子当接部８８が側片８１、８２間の連結片８３の下側に形成されている。また可動接触子ホルダ６０に、可動接触子当接部８８から側片８１の幅方向に可動接触子４８の厚みよりも広い間隔をおいて、可動接触子本体７６の可動接点固着面とは反対側面が対向する可動接触子移動防止部８７を側片８１の下端に内向きに折曲して設けている。また後述のように側片８２の下端部に被衝突片７３を外向きに折曲している。
【００２４】
可動接触子４８は、ハンドル４６にリンク機構を介して連結される可動接点５８を有し、可動接触子ホルダ６０に保持されている。この可動接触子４８は、反転ばね６１を懸架するばね保持片７５と、基端をばね保持片７５に略Ｌ字形に連設するとともに先端側に可動接点５８を固着し、ばね保持片７５に反転ばね６１を懸架した状態で固定接触子方向に付勢される可動接触子本体７６とを有する。ばね保持片７５は先端がＴ字形に形成されて抜止め係合部を形成し抜止め部８４に嵌合する。またフレーム６４に可動接触子４８の可動接点方向に延出する衝突片７２を設けるとともに、可動接点５８が固定接点５９に接触したときに開極ばね７１のばね力によってフレーム６４が移動する方向側で衝突片７２から所定間隔離れた状態で衝突片７２に対向する上述した被衝突片７３が可動接触子ホルダ６０に設けられている。したがって、フレーム６４の開極ばね７１による動作で衝突片７２が被衝突片７３に衝突して可動接触子ホルダ６０が開極方向に押圧される。
【００２５】
固定接触子４９は、可動接点５８に接離自在に対向する固定接点５９を有している。実施の形態では、導電板に略Ｕ字形のスリット１６０を形成しその内側の片に固定接点５９を設けるとともに消弧用ガイド部９９を突設している。
【００２６】
ラッチ部材５０は、作動部材４７の係止部５７をラッチしてリンク機構の均衡を保持する。すなわちフレーム６４をラッチした状態でハンドル４６のオフ位置からのオン操作によりハンドルリンク５６及び可動接触子ホルダ６０の軸支位置を越えて可動接点５８を固定接点５９に接触させる方向に反転ばね６１を位置させることができる。ラッチ部材５０は、器体４５の両側壁５４、５５間方向に移動自在であって作動部材４７の係止部５７をラッチするラッチ部９１を有し、一側壁５４と作動部材４７の係止部５７との間に配設されている。このラッチ部材５０は、器体４５の両側壁５４、５５間に対して直交方向を軸中心として器体４５の一側壁５４に回動自在に支持されている。すなわちラッチ部材５０は略平板状であり、ラッチ部９１はその下端部寄りに突設され、上端部の両側から突出する回動軸９２を設け、器体４５の一側壁５４に回動軸９２を支持する凹所９３を設け、更に器体４５の他側壁５５にラッチ部材５０の回転軸９２またはその近傍に当接して回動軸９２が凹所９３から脱落するのを防止する脱落防止片９５を設けている。またラッチ部材５０の一側壁５４との対向面１６２側を、上端の回動中心点側から下端のラッチ部９１側にかけて徐々に薄厚として傾斜状に形成している。したがって、ラッチ部材５０は垂直姿勢から一側壁５４に向けて回動することができ、この回動によりラッチ部９１が後退するラッチ解除の動作をすることができる。さらにラッチ部材５０の上端中央の回動中心点近傍に復帰片９６を設けるとともに、作動部材４７に、ハンドル４６を接点のオフ方向に回転させたときに復帰片９６に当接して係止部５７をラッチする方向にラッチ部材５０を回転させる当接片９７を設けている。
【００２７】
弾性係止部材１００は、一端側を固定端とするとともに他端側を自由端として固定端を支点として変形自在に器体４５のハンドル４６と作動部材４７の係止部５７の間に配設されている。この弾性係止部材１００は、固定端をＬ字形に折曲した略平板状であり、自由端の両側に当接片１０１及び当接片１０１よりも短い係止片１０２を二股状をなすように形成するとともに当接片１０１及び係止片１０２間で自由端の端面から所定距離の位置に逃げ部１０３が形成されている。これに対してラッチ部材６４がラッチされている状態のときに逃げ部１０３に臨む突部１０５をフレーム６４の係止部５７の近傍に設ける。一方ハンドル４６が少なくともオン位置にあるときに当接片１０１が先端に当接するとともに係止片１０２に対向して段差形成され、突部１０５が逃げ部１０３から移動して弾性係止部材１００を押圧するとき係止片１０２に引っ掛かる引掛部１０６を有する延出片１９７を、フレーム６４の係止部５７側との間で弾性係止部材１００を挟む形にハンドル４６から器体４５の内部に延出している。
【００２８】
移動規制部材１０７は、器体４５の一側壁５４に、通常状態では器体４５の一側壁５４とラッチ部材５０との間に介在し、異常電流検出装置５１による過電流検出時には器体４５の一側壁５４とラッチ部材５０との間から離脱する規制部１０８を有する。この移動規制部材１０７は、器体４５の両側壁５４、５５間方向を軸中心として一側壁５４に突設した軸１１２に中間部の軸受け部１１４が回動自在に支持され、一端部に規制部１０８を設け、他端部に検知部１１３を設け、軸受け部１１４と規制部１０８の間にばね受け部１１５を設けている。復帰ばね１０９は規制部１０８を器体４５の一側壁５４とラッチ部材５０との間に介在させる方向に付勢する。この復帰ばね１０９は器体４５の一側壁５４と移動規制部材１０７との間で納装されるコイル状の圧縮ばねとし、器体４５の他側壁５５に圧縮ばねの側面に当接する第２の脱落防止片１１０を設け、復帰ばね１０９の一端はばね受け部１１５に係止し、他端は一側壁５４に連続してハンドル４６を露出させる上壁１１５の内面に係止している。この移動規制部材１０７の規制部１０８を復帰ばね１０９に対して一定位置に規制するため器体４５にストッパ１５０を設けている。また規制部１０８に対してラッチ部材５０の下端の側部に規制部１０８を受ける受け部１２０を突出している。
【００２９】
異常電流検出装置５１は、過電流が流れたときにラッチ部材５０が作動部材４７のフレーム６４の係止部５７をラッチしている状態から、ラッチ部材５０を解放することによって開極ばね７１によりリンク機構の均衡を崩し、可動接点５８を固定接点５９から強制開極するものである。実施の形態は電磁石であり、電磁石本体１８０の端部に配置された可動片１４５が、電磁石本体１８０の側部に配置されたヨーク１４６に軸支され、復帰ばね１４７によりコイルの磁心２１０の頭部から離れ、可動片１４５に検知部１１３に対向する駆動部１４８を設けている。
【００３０】
連動棒１４６は作動部材４７と可動片１４５の間に位置しかつ一側壁５４を貫通して２極間にまたがるトリップ連動手段であり、器体４５に回転自在に支持されている。この連動棒１４６は各極の作動部材４７の係合部１９９の動作を検知して連動棒１４６を回転させる受動部１４８と、連動棒１４６の回転により可動片１４５を過電流検知動作と同方向に回転させる押圧部１５０を有する。
【００３１】
端子５２は可撓電線１４０を介して可動接触子４８に接続されている。端子５３は異常電流検出装置５１のコイル線を介して固定接触子４８に接続されている。
【００３２】
なお、ハンドル４６をハンドルリンク５６に取付ける作業の便利のため、ハンドル４６をハンドルリンク５６に係止可能な姿勢にハンドルリンク５６を反転ばね６１に抗して支持する支持用ピン（図示せず）を受ける切溝１９８をフレーム６４に形成している。実施の形態では、フレーム６４の両側片６２における係止部１３０の一方よりもハンドルリンク５６の軸支点からの距離が短く、かつ、反転ばね６１が反転してハンドルリンク５６の係止部１３０の一方が近づく方向で外面から連通した位置に切溝１９８を形成している。
【００３３】
フレーム６４の切溝１９８に支持用ピンを挿通させておき、この状態で支持用ピンにハンドルリンク５６を反転させるとハンドルリンク５６の端面がピンに当接して止まるので、この状態でハンドルリンク５６にハンドル４６をスライド取着することができる。ピンは後から抜くことができる。切溝１９８がなく、そのままハンドルリンク５６にハンドル４６を取着する場合、ハンドルリンク５６の係止部がフレーム６４の両側片６２の外面に位置することとなり、ハンドル４６をスライド取着するときにフレーム６４の両側片６２が邪魔になり、係止部１３０がフレーム６４の両側片６２に重ならないようにハンドルリンク５６を手で持ちながら保持する必要があり、ハンドル４６を取着する作業が煩わしい。
【００３４】
スイッチ１５１は器体４５の長さ方向の端部に配設される端子５２の上部に配置され、作動片１５２が作動部材４７または作動部材４７を開極動作させる開極ばね７１の端部に対向し、作動部材４７のラッチが解除されて開極ばね７１により回動することにより作動片１５２を押してスイッチ１５１を動作させる。スイッチ１５１に端子１５４が接続され、スイッチ１５１の信号が外部に取り出される。
【００３５】
１５５は消弧グリッド、１９０はばね１９０ａに付勢されたレール取付片である。
【００３６】
回路遮断器の動作について説明する。図７はオン状態、図９はオフ状態である。オン状態のときハンドル４６の露出部は器体４５の上壁１１５に略平行になり、図１５に示すように上壁１１５のハンドル穴１１５ａに近い位置に「ＯＮ」表示を施している。オフ状態のとき図１６に示すようにハンドル４６は傾斜姿勢に起立し、「ＯＮ」表示がハンドル穴１１５ａ内に隠れ、一方ハンドル４６の先端側に隠れるように上壁１１５に施されていた「ＯＦＦ」表示が見えるようになる。このオフ状態からオン状態は作動部材４７の係止部５７がラッチ部９１にラッチされた状態で行われる。ハンドル４６を図９のオフ位置から図７のオン位置に倒すと反転ばね６１が軸部材６９を乗り越えるように移動するので可動接点５８が固定接点５９に接触する方向に付勢され、図１１に示すように可動接点５８が固定接点５９に接触する。可動接点５８が固定接点５９に接触しても反転ばね６１により可動接触子ホルダ６０はさらに回動するので可動接触子４８が当接部８８から離れ移動防止部８７に当たりこれに押圧される（図１２）。これにより可動接点５８が固定接点５９に対しワイピングし、また移動防止部８７を介して可動接点ホルダ６０により押圧される。可動接点５８が固定接点５９に接触すると端子５２、５３間が接続され、その間に電流が流れることができる。
【００３７】
つぎにハンドル４６をオフ位置に回動すると反転ばね６１が軸部材６９を乗り越えたとき反転し、可動接触子４８にオフ方向に付勢力が働き、接点は開極する。
【００３８】
図１０はトリップ状態である。オン状態で端子５２、５３間に過電流が流れると異常電流検出装置５１の電磁力により可動片１４５が磁心２１０に吸引され、これにより駆動部１４８が検知部１１３を復帰ばね１０９に抗して押し規制部１０８が回動する。移動規制部１０８は図４に示すように一側壁５４とラッチ部材５０の受け部１２０との間の位置から、図６に示すように上方に移動して受け部１２０と一側壁５４との間に隙間ができる。その結果、ラッチ部９１に係合している作動部材４７の係止部５７は開極ばね７１による押圧力でラッチ部材５０を、受け部１２０が一側壁５４に接近するように回動させ、これにより係止部５７がラッチ部９１から外れ、図３から図５に示すように作動部材４７のラッチが解放される。作動部材４７は開極ばね７１のばね力により軸部材６９を中心に回動し、図８に示すように衝突片７２で可動接触子ホルダ６０の被衝突片７３を押し、可動接触子ホルダ６０を回動させ、反転ばね６１が軸部材６９を越えると、反転動作により可動接触子ホルダ６０の当接部８８を介して可動接触子４８が開極動作する。すなわち、開極ばねのばね力でフレーム６４を移動させることによりハンドルリンク５６及び可動接触子ホルダ６０の軸支位置を越えて可動接点５８を固定接点５９から離す方向に反転ばね６１を反転させて可動接点５８を固定接点５９から強制開極する。
【００３９】
作動部材４７の回動によりスイッチ１５１の作動片１５２が押されてスイッチ１５１が動作する。また作動部材４７の回動により連動棒１４６の受動部１４８が押されて回動し、押圧部１５０により他極の異常電流検出装置の可動片１４５を吸引方向に作動し、上記と同じ動作でトリップ動作に至らせる。
【００４０】
このトリップ動作でハンドル４６は反転ばね６１により、オン位置とオフ位置の中間の姿勢に回動する。そのため、図１７に示すように「ＯＮ」表示も「ＯＦＦ」表示も隠れる状態となる。ここで、ハンドル穴１１５ａに連続する分割体４５ｂ側のハンドル穴１１５ｂに切欠き２０１を形成し、ハンドル４６の側部に、ハンドル４６のトリップ姿勢で切欠き２０１の位置に例えば赤色などのトリップ表示２０２が現れるようにしている。
【００４１】
トリップ後のリセットは、ハンドル４６をオフ位置側に操作する。これにより、ハンドル４６の端部で作動部材４７が開極ばね７１に抗して押されて図１０の位置から反時計回りに回動し、作動部材４７の当接片９７でラッチ部材５０の復帰片９６を押し上げて受け部１２０を一側壁５４から離すと、移動規制部材１０７の規制部１０８が復帰ばね１０９によってその間に入り、図４の状態になる。ハンドル４６から手を離すと、開極ばね７１の作用で係止部５７がラッチ部９１に係止し、作動部材４７がラッチ状態となり、ハンドル４６はオフ姿勢となる。
【００４２】
作動部材４７のラッチが解除されて反転ばね６１により可動接触子４８を開極方向に付勢しても、可動接点５８と固定接点５９が接点溶着している場合、図１３および図１４に示すように作動部材４７は衝突片７２が可動接触子ホルダ６０の被衝突片７３に当たって規制されるまで若干回動する。このとき、図３から図１３および図１４に示すように作動部材４７の突部１０５が逃げ部１０３から出て弾性係止部材１００をハンドル４６の延出片１９７に向けて押す状態となる。弾性係止部材１００は図２に示すように当接片１０１が延出片１９７に当接しているので当接片１０１を支点に係止片１０２が延出片１９７側に押され、係止片１０２が延出片１９７に段差形成された凹み形状の引掛部１０６に係止する。このためハンドル４６は図５のようにトリップ表示姿勢に回動せずオン位置のままとなる。すなわち、接点溶着の場合はトリップしていてもハンドル４６はオン位置を示す。
【００４３】
なお、この発明において、ハンドルリンクを軸部材の第１軸部に軸支し、可動接触子ホルダを第２軸部に軸支させるようにこれらの幅寸法を設定してもよい。
【００４４】
【発明の効果】
請求項１記載の回路遮断器によれば、例えばフレームの両側片間に可動接触子ホルダを配設した状態で軸部材を各両側片の外面から挿通させて第１軸部で可動接触子ホルダを軸支した後、両側片の外側に突出する第２軸部でハンドルリンクを軸支することができる。従って、フレームの内面に突出する第１軸部の突出量を可動接触子ホルダの厚みと同等とすることができ、フレームの内面への突出量を少なくしてフレームの両側片間の間隔を狭くすることができ、もって器体全体のコンパクト化が図れる。また、鍔部がフレームの両側片に当接しているので、第１軸部及び第２軸部の傾きを少なくすることができ、接点の開閉動作への影響を少なくすることができる。さらに、軸部材の鍔部がフレームの両側片とハンドルリンクとの間に介在しているので、軸部材がフレームから外れるのを簡単に防止することができる。
【００４５】
請求項２記載の回路遮断器によれば、請求項１と同様な効果のほか、異常電流検出装置による異常電流検出によってフレームのラッチ状態が解除されて、フレームが移動する際、衝突片が被衝突片に衝突して可動接触子ホルダも移動させるので、可動接点が固定接点に溶着しにくくなる。
【００４６】
請求項３記載の回路遮断器によれば、請求項２と同様な効果のほか、異常電流検出装置による異常電流検出によってフレームのラッチが解除されるとともに可動接点が固定接点に溶着した際、フレームの衝突片が可動接触子ホルダの被衝突片に衝突してフレームの移動が停止される。このとき、フレームの突部が弾性係止部材の逃げ部から自由端の端面方向に移動するので、当接片とハンドルの延出片の先端とを支点として係止片がハンドル側に近づく。このため、ハンドルをオフ方向に回転しようとすると、ハンドルの引掛部が係止片に係合してそれ以上オフ方向に回転しなくなるので、接点溶着時にハンドルをオフ位置に移勤できなくなり、接点の開閉状態とハンドルの開閉状態とを同一にすることができる。
【００４７】
請求項４記載の回路遮断器によれば、請求項１、請求項２または請求項３と同様な効果のほか、可動接触子のばね保持片に反転ばねを懸架させた状態でそのまま可動接触子ホルダに嵌め込むと、ばね保持片が抜け止め部に当接するとともに可動接触子本体の可動接点固着面側が可動接触子当接部に当接するので、可動接触子を反転ばねのばね力のみで可動接触子ホルダに保持させることができる。また、反転ばねのばね力によって可動接触子の可動接点が固定接点に接触する方向に付勢されることとなるので、反転ばねを可動接点が固定接点に接触したときの接圧ばねとして兼用することができる。さらに、可動接点が固定接点に接触したときに可動接触子本体が可動接触子当接部から離れる方向に移動できるので、可動接点が固定接点に接触したときのワイピングにより、可動接点を固定接点に確実に接触させることができる。
【００４８】
請求項５記載の回路遮断器によれば、請求項４と同様な効果のほか、可動接点が固定接点に接触した後、反転ばねのばね力で可動接触子本体が可動接触子当接部から離れる方向に移動するが、このとき可動接触子本体が可動接点固着面とは反対側面が可動接触子移動防止部に当接するので、可動接点が固定接点に接触したときに、反転ばねのばね力が可動接触子に直接加わるとともに可動接触子ホルダの可動接触子移動防止部を介して可動接触子に加わることとなる。このため、可動接触子のみ反転ばねのばね力が加わったときと比べて可動接点が固定接点に強い接圧でもって接触することとなる。
【００４９】
請求項６記載の回路遮断器によれば、請求項１、請求項２、請求項３、請求項４または請求項５と同様な効果のほか、フレームの切溝に支持用ピンを挿通させておき、この状態で支持用ピンにハンドルリンクを反転させるとハンドルリンクの端面がピンに当接して止まるので、この状態でハンドルリンクにハンドルをスライド取着することができることとなり、ハンドルをハンドルリンクに取着する作業が容易となる。
【図面の簡単な説明】
【図１】この発明の一実施の形態の機構部の分解斜視図である。
【図２】全体の分解斜視図である。
【図３】オン状態の部分拡大図である。
【図４】（ａ）はそのリンク機構の部分側面図、（ｂ）は図３のＡ−Ａ線断面図である。
【図５】トリップ状態の部分拡大図である。
【図６】（ａ）はそのリンク機構の部分側面図、（ｂ）は図５のＢ−Ｂ線断面図である。
【図７】分割体を外した状態のオン状態の正面図である。
【図８】図７を裏側からみた断面図である。
【図９】分割体を外した状態のオフ状態の正面図である。
【図１０】分割体を外した状態のトリップ状態の正面図である。
【図１１】可動接点が固定接点に接触したときの部分拡大図である。
【図１２】可動接点が接触した後ワイピングした状態の部分拡大図である。
【図１３】異常電流検出装置が動作し、かつ接点の溶着状態の正面図である。
【図１４】その部分拡大図である。
【図１５】オン状態の平面図である。
【図１６】オフ状態の平面図である。
【図１７】トリップ状態の平面図である。
【図１８】従来例の内部部品の斜視図である。
【図１９】その部分分解斜視図である。
【符号の説明】
４５器体
４６ハンドル
４７作動部材
４８可動接触子
４９固定接触子
５０ラッチ部材
５１異常電流検出装置
５２端子
５３端子
５４両側壁
５６ハンドルリンク
５７係止部
５８可動接点
５９固定接点
６０可動接触子ホルダ
６１反転ばね
６２両側片
６３連結片
６４フレーム
６６第１軸部
６７鍔部
６８第２軸部
６９軸部材
７１開極ばね
７２衝突片
７３被衝突片
７５ばね保持片
８４抜止め部
８７可動接触子移動防止部
８８可動接触子当接部
９１ラッチ部
９５脱落防止片
９６復帰片
９７当接片
１００弾性係止部材
１０１当接片
１０２係止片
１０３逃げ部
１０５突部
１０７移動規制部材
１０８規制部
１０９復帰ばね
１１０第２の脱落防止片
１２０受け部
１３１切溝
１９７延出片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker that performs an opening / closing operation by suspending a reversing spring between a handle link and a movable contact holder.
[0002]
[Prior art]
As a conventional example, there is one shown in Japanese Patent Application Laid-Open No. 59-196524. As shown in FIG. 18 and FIG. 19, this is a rotating shaft (handle link) that is bent into a substantially U-shape with both ends bent outwardly on the inner surfaces of both sides of a movable frame (frame) 18. Both ends of 19 are supported, a movable arm (movable contact holder) 17 is supported on the rotating shaft, and a tension spring (reversing spring) 23 is suspended between the rotating shaft and the movable arm. 4 is a handle, 6 is a movable contact, 8 is a movable contact, 10 is a fixed contact, and 13 is a terminal.
[0003]
[Problems to be solved by the invention]
In the circuit breaker described above, since the rotating shaft 19 supported by the movable frame 18 is bent, it is necessary to take a sufficient length between the both side pieces of the movable frame 18 by the curvature thereof. It was difficult to make the whole body compact because the distance between the both side pieces of the frame became large. Further, since the rotary shaft itself is bent so as to extend to the handle 4, it is necessary to increase the diameter of the shaft in order to prevent it from being bent by the load of the reversing spring 23, and the compactness becomes more and more compact. There was a problem that could not be planned.
[0004]
The present invention has been made in view of such a reason, and an object thereof is to provide a circuit breaker that can be made compact.
[0005]
[Means for Solving the Problems]
The circuit breaker according to claim 1 includes a body, a handle partially protruding from the body, a handle link supporting the handle, both side pieces pivotally supporting the handle link, and the A frame having a connecting piece for connecting both side pieces, a movable contact holder pivotally supported on the same side of the handle link with respect to the both side pieces of the frame, and a movable contact A movable contact held by the movable contact holder, and a reversing spring suspended between the movable contact and the handle link and reversing around the pivot position of the handle link and the movable contact holder; In a circuit breaker comprising a fixed contact having a fixed contact facing the movable contact in a freely detachable manner,
A first shaft portion that is inserted from the outer surface of the both side pieces of the frame toward the inner surface, a flange portion that comes into contact with the outer surface of the frame when the first shaft portion is inserted through the both side pieces, and the flange portion A pair of shaft members having a second shaft portion projecting from the first shaft portion to the opposite side to the first shaft portion are mounted on the both side pieces of the frame so as to be on the same axis, and the movable contact holder and One of the handle links is pivotally supported on the first shaft portion, and the other is pivotally supported on the second shaft portion.
[0006]
According to the circuit breaker according to claim 1, for example, in a state where the movable contact holder is disposed between the both side pieces of the frame, the shaft member is inserted from the outer surface of each of the both side pieces, and the movable contact holder at the first shaft portion. After the shaft is pivotally supported, the handle link can be pivotally supported by the second shaft portion that protrudes outside the both side pieces. Therefore, the protrusion amount of the first shaft portion protruding from the inner surface of the frame can be made equal to the thickness of the movable contact holder, and the protrusion amount to the inner surface of the frame is reduced to narrow the distance between the both side pieces of the frame. Therefore, the entire body can be made compact. Further, since the flange portion is in contact with both side pieces of the frame, the inclination of the first shaft portion and the second shaft portion can be reduced, and the influence on the opening / closing operation of the contact can be reduced. Further, since the flange portion of the shaft member is interposed between the both side pieces of the frame and the handle link, it is possible to easily prevent the shaft member from coming off the frame.
[0007]
A circuit breaker according to a second aspect of the present invention is the circuit breaker according to the first aspect of the present invention, wherein the frame is latched and the handle contacts and the movable contact holder holders are moved beyond the shaft support positions by the on operation from the off position of the handle. A latch member that positions the reversing spring in a direction that causes the fixed contact to contact the fixed contact, and the movable member holder and the movable contact holder are moved beyond the shaft support position in a state where the latch member releases the latch of the frame. An opening spring that urges the frame in a direction to reverse the reversing spring so that the contact is separated from the fixed contact, and the latch member latches the locking portion of the frame when an overcurrent flows An abnormal current detection device that releases the movable contact from the fixed contact by the opening spring and releases the movable contact from the fixed contact, and the collision piece on the frame Provided with, in which an object to be collision piece the movable contact holder said impact piece operation by the opening spring of the frame collide is pressed in the opening direction is provided on the movable contact holder.
[0008]
According to the circuit breaker of the second aspect, in addition to the same effect as that of the first aspect, when the abnormal state of the frame is released by the abnormal current detection by the abnormal current detection device, Since the movable contact holder is moved by colliding with the collision piece, the movable contact is hardly welded to the fixed contact.
[0009]
3. The circuit breaker according to claim 3, wherein the circuit breaker according to claim 2 is provided with an elastic lock that is arranged on the container body so that the one end side is a fixed end and the other end side is a free end, and the one end is a fulcrum. A member is provided, and the elastic locking member is formed in a forked shape on both sides of the free end from the end surface of the free end between the contact piece and the locking piece. When a relief portion is formed at a position of a predetermined distance, and a projection that faces the relief portion is provided on the frame when the frame is latched by the latch member, and the handle is at least in the on position. The contact piece is abutted and formed with a step so as to face the locking piece, and has a hooking portion that is hooked on the locking piece when the protrusion moves from the escape portion and presses the elastic locking member. Extend the piece to the handle Those digits.
[0010]
According to the circuit breaker of the third aspect, in addition to the same effect as the second aspect, when the abnormal current detection by the abnormal current detection device releases the latch of the frame and the movable contact is welded to the fixed contact, The colliding piece collides with the colliding piece of the movable contact holder and the movement of the frame is stopped. At this time, the projecting portion of the frame moves from the escape portion of the elastic locking member toward the end surface of the free end, so that the locking piece approaches the handle side with the contact piece and the tip of the extended piece of the handle as fulcrums. For this reason, when the handle is rotated in the off direction, the hook portion of the handle engages with the locking piece and does not rotate further in the off direction, so that the handle cannot be moved to the off position when the contact is welded. The open / close state and the open / close state of the handle can be the same.
[0011]
A circuit breaker according to a fourth aspect of the present invention is the circuit breaker according to the first, second, or third aspect, wherein the movable contactor includes a spring holding piece that suspends the reversing spring and a base end that is connected to the spring holding piece. And a movable contact main body biased in the direction of the stationary contact with the reversing spring suspended from the spring holding piece, and the movable contact holder, A retaining portion that prevents the movable contact from coming off due to the spring force of the reversing spring, and a movable contact where the movable contact fixing surface side of the movable contact main body abuts due to the spring force of the reversing spring. A child contact portion is formed.
[0012]
According to the circuit breaker of the fourth aspect, in addition to the same effect as that of the first, second, or third aspect, the movable contactor is left in a state where the reversing spring is suspended from the spring holding piece of the movable contactor. When fitted into the holder, the spring holding piece comes into contact with the retaining portion and the movable contact fixing surface side of the movable contact main body comes into contact with the movable contact portion, so that the movable contact can be moved only by the spring force of the reversing spring. It can be held by the contact holder. Further, since the movable contact of the movable contact is biased in the direction in which the movable contact contacts the fixed contact by the spring force of the reverse spring, the reverse spring is also used as a contact pressure spring when the movable contact contacts the fixed contact. be able to. Furthermore, since the movable contact body can move in a direction away from the movable contact portion when the movable contact contacts the fixed contact, wiping when the movable contact contacts the fixed contact makes the movable contact a fixed contact. It can be reliably contacted.
[0013]
The circuit breaker according to a fifth aspect of the present invention is the circuit breaker according to the fourth aspect, wherein the movable contactor main body is separated from the movable contactor contact portion by a distance larger than the thickness of the movable contactor. A movable contact movement preventing portion having a side opposite to the movable contact fixing surface is provided.
[0014]
According to the circuit breaker of the fifth aspect, in addition to the same effect as that of the fourth aspect, after the movable contact comes into contact with the fixed contact, the movable contact main body is moved away from the movable contact by the spring force of the reversing spring. The movable contactor body moves away from the movable contact fixing surface, but the side opposite to the movable contact fixed surface comes into contact with the movable contact movement prevention part. Is directly added to the movable contact and is added to the movable contact through the movable contact movement preventing portion of the movable contact holder. For this reason, the movable contact comes into contact with the fixed contact with a stronger contact pressure than when the spring force of the reversing spring is applied only to the movable contact.
[0015]
A circuit breaker according to a sixth aspect of the present invention is the circuit breaker according to the first, second, third, fourth, or fifth aspect, wherein the handle link is provided on both sides in the handle rotation direction of the handle link. Locked portions that are slid from the side surface side of the handle link and are locked to the respective lock portions are provided on both sides in the rotational direction of the handle, respectively, and the handle link is placed in a posture in which the handle can be locked to the handle link. A cut groove for receiving a support pin that supports the reversing spring is formed in the frame.
[0016]
According to the circuit breaker of the sixth aspect, in addition to the same effects as those of the first, second, third, fourth, or fifth aspect, the support pin is inserted into the groove of the frame. In this state, if the handle link is reversed to the support pin, the end surface of the handle link comes into contact with the pin and stops. In this state, the handle can be slid and attached to the handle link. The attachment work becomes easy.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. That is, this circuit breaker basically includes a body 45, a handle 46, a movable contact 47, a fixed contact 48, an operating member 49, a latch member 50, an abnormal current detection device 51, Terminals 52 and 53 are provided.
[0018]
The container body 45 has a box shape having a component storage space inside, and is of a side-fitting type in which components are arranged from opposite directions of the side walls 54 and 55. That is, the container body 45 is configured to be divided into two in the opposing direction of the both side walls, and the components are housed inside in an open state. This circuit breaker is of a two-pole type and is configured to be divided into three in the direction of both side walls. A partition is provided in the center of the central divided body 45a to form one side wall 54 on both side walls, and the divided bodies 45b on both sides. A part for one pole is housed between the side walls 54 and 55.
[0019]
A part of the handle 46 protrudes from the container body 45, the handle 46 is supported by the handle link 56, and is held rotatably with respect to the container body 45. The handle 46 is shared by two poles and engages with the handle link 56 of each pole. Therefore, the locking portions 130 are provided on both sides of the handle link 56 in the handle rotation direction, respectively, and the handle links 56 are slid from the side surfaces of the handle link 56 on both sides in the rotation direction of the handle 46 to be locked to the lock portions 130. Each of the locking portions 131 is provided. A handle hole 115a is formed in the upper wall 115 of the body 45, and a part of the handle 46 protrudes from the handle hole 115a.
[0020]
The actuating member 47 has a latching portion 57 that is latched, and is biased in a direction that breaks the balance of the link mechanism when the movable contact 58 is in contact with the fixed contact 59. The link mechanism includes a handle link 56, a movable contact holder 60, and a reversing spring 61. The operating member 47 includes a frame 64 having both side pieces 62 that pivotally support the handle link 56 and a connecting piece 63 that connects the both side pieces 62. The movable contact holder 60 is pivotally supported on both side pieces 62 of the frame 64 so as to be rotatable on the same axis as the handle link 56. That is, the first shaft portion 66 inserted from the outer surface to the inner surface direction through the holes 62 a formed in the both side pieces 62 of the frame 64, and the outer surface of the frame 64 when the first shaft portion 66 is inserted into the both side pieces 62. A pair of shaft members 69 each having a flange portion 67 that abuts and a second shaft portion 68 that protrudes from the flange portion 67 to the opposite side of the first shaft portion 66 are connected to the both side pieces 62 of the frame 64 on the same axis. The movable contact holder 60 is pivotally supported on the first shaft portion 66 and the handle link 56 is pivotally supported on the second shaft portion 68. The reversing spring 61 is suspended between the movable contact 48 and the handle link 56 and is reversed about the pivotal support position of the handle link 56 and the movable contact holder 60.
[0021]
Further, both ends of an opening spring 71 using, for example, a torsion coil spring are fitted between the hole 62b formed in the side piece 62 of the frame 64 and the hole 70 formed in the one side wall 54 of the container body 45, whereby the operating member 47 is fitted. Is energized in the direction of breaking the balance of the link mechanism. That is, the opening spring 71 is configured so that the reversing spring 61 exceeds the shaft support position of the handle link 56 and the movable contact holder 60 and the movable contact 58 is separated from the fixed contact 59 in a state where the latch member 50 releases the latch of the frame 64. The frame 64 is biased in the direction in which the reversing spring 61 is reversed.
[0022]
On the other hand, the handle link 56 is a substantially U-shaped member having a width opposite to that of the operating member 47, and a bearing 77 pivotally supported by the second shaft portion 68 is cut out at the lower end. A receiving portion 79 for supporting a spring receiving pin 78 bent in a substantially reverse shape so as to receive the upper end of the reversing spring 61 is formed in the opposite upper end.
[0023]
Furthermore, the movable contact holder 60 includes a pair of side pieces 81 and 82 facing each other in a width that can be inserted between both side pieces 62 of the frame 64 of the operating member 47 and a connecting piece 83 for connecting them. A bearing 85 that fits into the first shaft portion 66 is formed by a hole at the upper end of the pair of side pieces 81 and 82, and a spring holding piece 75 that receives the reversal spring 61 of the movable contact 48 is retained in the connecting piece 83. A retaining portion 84 to be joined is cut out. The movable contact holder 60 prevents the movable contact 48 from coming off due to the spring holding piece 75 coming into contact with the retaining portion 84 by the spring force of the reversing spring 61. A movable contact abutting portion 88 with which the movable contact fixing surface side of the movable contact main body 76 abuts by the spring force of the reversing spring 61 is formed below the connecting piece 83 between the side pieces 81 and 82. Further, the movable contact holder 60 is opposite to the movable contact fixing surface of the movable contact main body 76 at a distance larger than the thickness of the movable contact 48 in the width direction of the side piece 81 from the movable contact abutting portion 88. A movable contact movement preventing portion 87 whose side surfaces are opposed to each other is provided by bending inwardly at the lower end of the side piece 81. Further, as will be described later, a collision piece 73 is bent outward at the lower end of the side piece 82.
[0024]
The movable contact 48 has a movable contact 58 connected to the handle 46 via a link mechanism, and is held by a movable contact holder 60. The movable contact 48 has a spring holding piece 75 for suspending the reversing spring 61, a base end connected to the spring holding piece 75 in a substantially L shape, and a movable contact 58 fixed to the distal end side. And a movable contact main body 76 that is biased toward the fixed contact in a state where the reversing spring 61 is suspended. The tip of the spring holding piece 75 is formed in a T shape to form a retaining engagement portion and is fitted to the retaining portion 84. Further, a collision piece 72 extending in the direction of the movable contact of the movable contact 48 is provided on the frame 64, and the frame 64 moves by the spring force of the opening spring 71 when the movable contact 58 contacts the fixed contact 59. The movable contact holder 60 is provided with the above-mentioned collision target piece 73 facing the collision piece 72 while being separated from the collision piece 72 by a predetermined distance. Therefore, the collision piece 72 collides with the colliding piece 73 by the operation of the opening spring 71 of the frame 64 and the movable contact holder 60 is pressed in the opening direction.
[0025]
The fixed contact 49 has a fixed contact 59 that is opposed to the movable contact 58 so as to be able to contact and separate. In the embodiment, the substantially U-shaped slit 160 is formed in the conductive plate, the fixed contact 59 is provided on the inner piece, and the arc extinguishing guide portion 99 is projected.
[0026]
The latch member 50 latches the locking portion 57 of the operating member 47 to maintain the balance of the link mechanism. That is, when the frame 64 is latched, the reversing spring 61 is moved in the direction in which the movable contact 58 is brought into contact with the fixed contact 59 beyond the shaft support position of the handle link 56 and the movable contact holder 60 by turning on the handle 46 from the off position. Can be positioned. The latch member 50 has a latch portion 91 that is movable in the direction between the side walls 54 and 55 of the container body 45 and latches the locking portion 57 of the operating member 47, and the one side wall 54 and the operating member 47 are locked. It is arranged between the part 57. The latch member 50 is rotatably supported on one side wall 54 of the container body 45 with an orthogonal direction as an axial center with respect to the side walls 54 and 55 of the container body 45. That is, the latch member 50 has a substantially flat plate shape, and the latch portion 91 is provided near the lower end portion thereof, and is provided with a rotation shaft 92 protruding from both sides of the upper end portion. Is provided on the other side wall 55 of the container body 45 so as to abut against the rotary shaft 92 of the latch member 50 or the vicinity thereof to prevent the rotary shaft 92 from dropping out of the recess 93. 95 is provided. Further, the surface 162 facing the one side wall 54 of the latch member 50 is formed in an inclined shape with a gradually decreasing thickness from the upper rotation center point side to the lower latch portion 91 side. Therefore, the latch member 50 can be rotated from the vertical posture toward the one side wall 54, and the latch release operation in which the latch portion 91 is retracted by this rotation can be performed. Further, a return piece 96 is provided in the vicinity of the center of rotation at the center of the upper end of the latch member 50, and the operating member 47 contacts the return piece 96 when the handle 46 is rotated in the contact OFF direction. A contact piece 97 for rotating the latch member 50 in the direction of latching is provided.
[0027]
The elastic locking member 100 is disposed between the handle 46 of the container 45 and the locking portion 57 of the actuating member 47 so that one end side is a fixed end and the other end side is a free end and the fixed end is a fulcrum. Has been. This elastic locking member 100 has a substantially flat plate shape with its fixed end bent into an L shape, and has a fork shape with a contact piece 101 and a lock piece 102 shorter than the contact piece 101 on both sides of the free end. And a relief portion 103 is formed between the contact piece 101 and the locking piece 102 at a predetermined distance from the end face of the free end. On the other hand, a protrusion 105 facing the escape portion 103 when the latch member 64 is latched is provided in the vicinity of the locking portion 57 of the frame 64. On the other hand, when the handle 46 is at least in the on position, the abutting piece 101 abuts on the tip and a step is formed facing the locking piece 102, and the protrusion 105 moves from the escape portion 103 to move the elastic locking member 100. An extension piece 197 having a hooking portion 106 that is hooked to the locking piece 102 when pressed is inserted from the handle 46 to the inside of the body 45 so as to sandwich the elastic locking member 100 between the frame 64 and the locking portion 57 side. It is extended.
[0028]
The movement restricting member 107 is interposed on one side wall 54 of the container body 45 between the one side wall 54 of the container body 45 and the latch member 50 in a normal state, and when the overcurrent is detected by the abnormal current detection device 51, A restricting portion 108 is provided to be separated from between the one side wall 54 and the latch member 50. This movement restricting member 107 is supported by a shaft 112 projecting from one side wall 54 centering on the direction between both side walls 54 and 55 of the container body 45 so that the intermediate bearing portion 114 is pivotally supported and restricted at one end. A detecting portion 113 is provided at the other end, and a spring receiving portion 115 is provided between the bearing portion 114 and the restricting portion 108. The return spring 109 biases the restricting portion 108 in a direction in which the restricting portion 108 is interposed between the one side wall 54 of the container body 45 and the latch member 50. The return spring 109 is a coiled compression spring that is mounted between the one side wall 54 of the container body 45 and the movement restricting member 107, and the second spring 55 abuts against the side wall of the compression spring on the other side wall 55 of the container body 45. A drop-off preventing piece 110 is provided, and one end of the return spring 109 is locked to the spring receiving portion 115, and the other end is locked to the inner surface of the upper wall 115 that exposes the handle 46 continuously to the one side wall 54. In order to restrict the restricting portion 108 of the movement restricting member 107 to a fixed position with respect to the return spring 109, a stopper 150 is provided on the container body 45. Further, the receiving portion 120 that receives the restricting portion 108 protrudes from the restricting portion 108 on the side of the lower end of the latch member 50.
[0029]
The abnormal current detecting device 51 releases the latch member 50 from the state in which the latch member 50 latches the engaging portion 57 of the frame 64 of the operating member 47 when an overcurrent flows, and thereby opens the spring 71. The link mechanism is unbalanced, and the movable contact 58 is forcibly opened from the fixed contact 59. The embodiment is an electromagnet, and a movable piece 145 disposed at the end of the electromagnet main body 180 is pivotally supported by a yoke 146 disposed at a side of the electromagnet main body 180, and the head of the coil magnetic core 210 is supported by a return spring 147. A drive unit 148 is provided on the movable piece 145 so as to face the detection unit 113.
[0030]
The interlocking rod 146 is trip interlocking means that is located between the actuating member 47 and the movable piece 145 and extends through the one side wall 54 and spans between the two poles, and is rotatably supported by the container body 45. This interlocking rod 146 detects the operation of the engaging portion 199 of the actuating member 47 of each pole and rotates the interlocking rod 146, and the rotation of the interlocking rod 146 causes the movable piece 145 to move in the same direction as the overcurrent detection operation. It has the press part 150 rotated in the direction.
[0031]
The terminal 52 is connected to the movable contact 48 via the flexible electric wire 140. The terminal 53 is connected to the fixed contact 48 via the coil wire of the abnormal current detection device 51.
[0032]
For convenience of attaching the handle 46 to the handle link 56, a support pin (not shown) for supporting the handle link 56 against the reversing spring 61 in a posture that allows the handle 46 to be locked to the handle link 56. A kerf 198 is formed in the frame 64 for receiving. In the embodiment, the distance from the shaft fulcrum of the handle link 56 is shorter than one of the locking portions 130 in the both side pieces 62 of the frame 64, and the reversing spring 61 is reversed so that the locking portion 130 of the handle link 56 A kerf 198 is formed at a position where one side approaches from the outer surface.
[0033]
If the support pin is inserted into the groove 198 of the frame 64 and the handle link 56 is reversed to the support pin in this state, the end surface of the handle link 56 comes into contact with the pin and stops. In this state, the handle link 56 is stopped. The handle 46 can be attached by sliding. The pin can be removed later. When the handle 46 is directly attached to the handle link 56 without the kerf 198, the engaging portion of the handle link 56 is located on the outer surface of the both side pieces 62 of the frame 64, and when the handle 46 is slid attached. It is necessary to hold the handle link 56 by hand so that the both side pieces 62 of the frame 64 are in the way and the locking portion 130 does not overlap the both side pieces 62 of the frame 64, and the work of attaching the handle 46 is troublesome. .
[0034]
The switch 151 is disposed on the upper portion of the terminal 52 disposed at the end of the container body 45 in the length direction, and the operating piece 152 is connected to the end of the opening spring 71 that opens the operating member 47 or opens the operating member 47. Oppositely, the latch of the actuating member 47 is released and the opening spring 71 rotates to push the actuating piece 152 to operate the switch 151. A terminal 154 is connected to the switch 151, and a signal from the switch 151 is extracted to the outside.
[0035]
155 is an arc extinguishing grid, and 190 is a rail mounting piece biased by a spring 190a.
[0036]
The operation of the circuit breaker will be described. FIG. 7 shows an on state, and FIG. 9 shows an off state. When in the on state, the exposed portion of the handle 46 is substantially parallel to the upper wall 115 of the container body 45, and as shown in FIG. 15, "ON" is displayed at a position near the handle hole 115a of the upper wall 115. As shown in FIG. 16, the handle 46 stands up in an inclined position in the off state, and the “ON” display is hidden in the handle hole 115 a and on the other hand, is hidden on the tip side of the handle 46. The “OFF” display becomes visible. From the off state to the on state, the engaging portion 57 of the operating member 47 is latched by the latch portion 91. When the handle 46 is tilted from the OFF position in FIG. 9 to the ON position in FIG. 7, the reversing spring 61 moves so as to get over the shaft member 69, so that the movable contact 58 is urged in a direction to contact the fixed contact 59, as shown in FIG. As shown, the movable contact 58 contacts the fixed contact 59. Even if the movable contact 58 comes into contact with the fixed contact 59, the movable contact holder 60 is further rotated by the reversing spring 61, so that the movable contact 48 is separated from the abutting portion 88 and hits against the movement preventing portion 87 to be pressed (see FIG. 12). As a result, the movable contact 58 is wiped with respect to the fixed contact 59 and is pressed by the movable contact holder 60 via the movement preventing portion 87. When the movable contact 58 contacts the fixed contact 59, the terminals 52 and 53 are connected, and a current can flow between them.
[0037]
Next, when the handle 46 is turned to the off position, the reversing spring 61 is reversed when it has passed over the shaft member 69, and the urging force acts on the movable contact 48 in the off direction to open the contact.
[0038]
FIG. 10 shows a trip state. When an overcurrent flows between the terminals 52 and 53 in the ON state, the movable piece 145 is attracted to the magnetic core 210 by the electromagnetic force of the abnormal current detection device 51, whereby the drive unit 148 resists the detection unit 113 against the return spring 109. The push restricting portion 108 rotates. The movement restricting portion 108 moves upward from the position between the one side wall 54 and the receiving portion 120 of the latch member 50 as shown in FIG. 4 and moves between the receiving portion 120 and the one side wall 54 as shown in FIG. There is a gap. As a result, the locking portion 57 of the operating member 47 engaged with the latch portion 91 rotates the latch member 50 by the pressing force of the opening spring 71 so that the receiving portion 120 approaches the one side wall 54, As a result, the locking portion 57 is released from the latch portion 91, and the latch of the operating member 47 is released as shown in FIGS. The actuating member 47 is rotated about the shaft member 69 by the spring force of the opening spring 71, and the collision piece 72 pushes the colliding piece 73 of the movable contact holder 60 as shown in FIG. When the reversing spring 61 exceeds the shaft member 69, the movable contact 48 opens the contact via the contact portion 88 of the movable contact holder 60 by the reversing operation. That is, by moving the frame 64 with the spring force of the opening spring, the reversing spring 61 is reversed in a direction to move the movable contact 58 away from the fixed contact 59 beyond the shaft support position of the handle link 56 and the movable contact holder 60. The movable contact 58 is forcibly opened from the fixed contact 59.
[0039]
The operation piece 47 of the switch 151 is pushed by the rotation of the operation member 47, and the switch 151 is operated. Further, the passive member 148 of the interlocking rod 146 is pushed and rotated by the rotation of the actuating member 47, and the movable piece 145 of the abnormal current detecting device of the other pole is operated in the suction direction by the pressing unit 150. Lead to trip action.
[0040]
In this trip operation, the handle 46 is rotated by the reversing spring 61 to an intermediate position between the on position and the off position. Therefore, as shown in FIG. 17, both the “ON” display and the “OFF” display are hidden. Here, a notch 201 is formed in the handle hole 115b on the side of the divided body 45b that is continuous with the handle hole 115a, and a trip display such as red is displayed at the position of the notch 201 in the trip position of the handle 46 on the side of the handle 46. 202 appears.
[0041]
To reset after tripping, the handle 46 is operated to the off position side. As a result, the operating member 47 is pushed against the opening spring 71 at the end of the handle 46 and rotated counterclockwise from the position shown in FIG. When the return piece 96 is pushed up and the receiving part 120 is separated from the one side wall 54, the restricting part 108 of the movement restricting member 107 enters between them by the return spring 109, and the state shown in FIG. When the hand is released from the handle 46, the locking portion 57 is locked to the latch portion 91 by the action of the opening spring 71, the operating member 47 is in a latched state, and the handle 46 is turned off.
[0042]
If the movable contact 58 and the fixed contact 59 are welded to each other even when the movable member 48 is biased in the opening direction by the reversing spring 61 when the latch of the actuating member 47 is released, FIG. 13 and FIG. Thus, the actuating member 47 is slightly rotated until the collision piece 72 comes into contact with the collision piece 73 of the movable contact holder 60 and is regulated. At this time, as shown in FIG. 3 to FIG. 13 and FIG. As shown in FIG. 2, in the elastic locking member 100, the contact piece 101 is in contact with the extension piece 197, so that the lock piece 102 is pushed to the extension piece 197 side with the contact piece 101 as a fulcrum. The piece 102 is engaged with a recessed hooking portion 106 formed in a step on the extending piece 197. Therefore, the handle 46 does not rotate to the trip display posture as shown in FIG. That is, in the case of contact welding, the handle 46 shows the on position even if it is tripped.
[0043]
In the present invention, these width dimensions may be set so that the handle link is pivotally supported by the first shaft portion of the shaft member and the movable contact holder is pivotally supported by the second shaft portion.
[0044]
【The invention's effect】
According to the circuit breaker according to claim 1, for example, in a state where the movable contact holder is disposed between the both side pieces of the frame, the shaft member is inserted from the outer surface of each of the both side pieces, and the movable contact holder at the first shaft portion. After the shaft is pivotally supported, the handle link can be pivotally supported by the second shaft portion that protrudes outside the both side pieces. Therefore, the protrusion amount of the first shaft portion protruding from the inner surface of the frame can be made equal to the thickness of the movable contact holder, and the protrusion amount to the inner surface of the frame is reduced to narrow the distance between the both side pieces of the frame. Therefore, the entire body can be made compact. Further, since the flange portion is in contact with both side pieces of the frame, the inclination of the first shaft portion and the second shaft portion can be reduced, and the influence on the opening / closing operation of the contact can be reduced. Further, since the flange portion of the shaft member is interposed between the both side pieces of the frame and the handle link, it is possible to easily prevent the shaft member from coming off the frame.
[0045]
According to the circuit breaker of the second aspect, in addition to the same effect as that of the first aspect, when the abnormal state of the frame is released by the abnormal current detection by the abnormal current detection device, Since the movable contact holder is moved by colliding with the collision piece, the movable contact is hardly welded to the fixed contact.
[0046]
According to the circuit breaker of the third aspect, in addition to the same effect as the second aspect, when the abnormal current detection by the abnormal current detection device releases the latch of the frame and the movable contact is welded to the fixed contact, The colliding piece collides with the colliding piece of the movable contact holder and the movement of the frame is stopped. At this time, the projecting portion of the frame moves from the escape portion of the elastic locking member toward the end surface of the free end, so that the locking piece approaches the handle side with the contact piece and the tip of the extended piece of the handle as fulcrums. For this reason, when the handle is rotated in the off direction, the hook portion of the handle engages with the locking piece and does not rotate further in the off direction, so that the handle cannot be transferred to the off position when the contact is welded. The open / close state of the handle and the open / close state of the handle can be made the same.
[0047]
According to the circuit breaker of the fourth aspect, in addition to the same effect as that of the first, second, or third aspect, the movable contactor is left in a state where the reversing spring is suspended from the spring holding piece of the movable contactor. When fitted into the holder, the spring holding piece comes into contact with the retaining portion and the movable contact fixing surface side of the movable contact main body comes into contact with the movable contact portion, so that the movable contact can be moved only by the spring force of the reversing spring. It can be held by the contact holder. Further, since the movable contact of the movable contact is biased in the direction in which the movable contact contacts the fixed contact by the spring force of the reverse spring, the reverse spring is also used as a contact pressure spring when the movable contact contacts the fixed contact. be able to. Furthermore, since the movable contact body can move in a direction away from the movable contact portion when the movable contact contacts the fixed contact, wiping when the movable contact contacts the fixed contact makes the movable contact a fixed contact. It can be reliably contacted.
[0048]
According to the circuit breaker of the fifth aspect, in addition to the same effect as that of the fourth aspect, after the movable contact comes into contact with the fixed contact, the movable contact main body is moved away from the movable contact by the spring force of the reversing spring. The movable contactor body moves away from the movable contact fixing surface, but the side opposite to the movable contact fixed surface comes into contact with the movable contact movement prevention part. Is directly added to the movable contact and is added to the movable contact through the movable contact movement preventing portion of the movable contact holder. For this reason, the movable contact comes into contact with the fixed contact with a stronger contact pressure than when the spring force of the reversing spring is applied only to the movable contact.
[0049]
According to the circuit breaker of the sixth aspect, in addition to the same effects as those of the first, second, third, fourth, or fifth aspect, the support pin is inserted into the groove of the frame. In this state, if the handle link is reversed to the support pin, the end surface of the handle link comes into contact with the pin and stops. In this state, the handle can be slid and attached to the handle link. The attachment work becomes easy.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a mechanism unit according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the whole.
FIG. 3 is a partially enlarged view of an ON state.
4A is a partial side view of the link mechanism, and FIG. 4B is a cross-sectional view taken along line AA in FIG. 3;
FIG. 5 is a partially enlarged view of a trip state.
6A is a partial side view of the link mechanism, and FIG. 6B is a cross-sectional view taken along the line BB in FIG. 5;
FIG. 7 is a front view of an ON state in a state where a divided body is removed.
FIG. 8 is a cross-sectional view of FIG. 7 as seen from the back side.
FIG. 9 is a front view of the off state with the divided body removed.
FIG. 10 is a front view of a trip state with a divided body removed.
FIG. 11 is a partially enlarged view when the movable contact comes into contact with the fixed contact.
FIG. 12 is a partially enlarged view showing a state where wiping is performed after the movable contact comes into contact;
FIG. 13 is a front view of the abnormal current detection device operating and the contact welded state.
FIG. 14 is a partially enlarged view thereof.
FIG. 15 is a plan view of an ON state.
FIG. 16 is a plan view of an off state.
FIG. 17 is a plan view of a trip state.
FIG. 18 is a perspective view of internal parts of a conventional example.
FIG. 19 is a partially exploded perspective view thereof.
[Explanation of symbols]
45 body
46 Handle
47 Actuating member
48 Movable contact
49 Fixed contact
50 Latch member
51 Abnormal current detection device
52 terminals
53 terminals
54 Side walls
56 Handle link
57 Locking part
58 Movable contact
59 Fixed contact
60 Movable contact holder
61 Reversing spring
62 Both sides
63 Connecting piece
64 frames
66 First shaft
67 Buttocks
68 Second shaft
69 Shaft member
71 Opening spring
72 Colliding pieces
73 Impacted piece
75 Spring holding piece
84 Stopper
87 Movable contactor movement prevention part
88 Movable contact part
91 Latch part
95 Fall-off prevention piece
96 Return piece
97 Contact piece
100 Elastic locking member
101 Contact piece
102 Locking piece
103 escape
105 Projection
107 Movement restriction member
108 Regulatory Department
109 Return spring
110 Second fall-off prevention piece
120 receiving part
131 kerf
197 Extension piece

Claims

器体と、この器体から一部が突出するハンドルと、このハンドルを支持するハンドルリンクと、このハンドルリンクを回動自在に軸支する両側片及びこの両側片間を連結する連結片を有したフレームと、このフレームの前記両側片に対して前記ハンドルリンクと同一軸線上で回動自在に軸支された可動接触子ホルダと、可動接点を有し可動接触子ホルダに保持された可動接触子と、この可動接触子と前記ハンドルリンクとの間に懸架されて前記ハンドルリンク及び前記可動接触子ホルダの軸支位置を中心に反転する反転ばねと、前記可動接点に接離自在に対向する固定接点を有した固定接触子とを備えた回路遮断器において、
前記フレームの前記両側片の外面から内面方向へ挿通される第１軸部と、この第１軸部を前記両側片に挿通させたときに前記フレームの外面に当接する鍔部と、この鍔部から第１軸部とは反対側に突出する第２軸部とを有する一対の軸部材を、前記フレームの前記両側片の各々に同一軸線上となるように装着し、前記可動接触子ホルダおよび前記ハンドルリンクの一方を第１軸部に軸支するとともに他方を前記第２軸部に軸支したことを特徴とする回路遮断器。A container, a handle partially protruding from the container, a handle link for supporting the handle, side pieces for pivotally supporting the handle link, and a connecting piece for connecting the two side pieces. A movable contact holder rotatably supported on the same axis as the handle link with respect to the both side pieces of the frame, and a movable contact having a movable contact and held by the movable contact holder A reversing spring suspended between the movable contact and the handle link and reversing around a pivotal support position of the handle link and the movable contact holder, and facing the movable contact. In a circuit breaker comprising a stationary contact having a stationary contact,
A first shaft portion that is inserted from the outer surface of the both side pieces of the frame toward the inner surface, a flange portion that comes into contact with the outer surface of the frame when the first shaft portion is inserted through the both side pieces, and the flange portion A pair of shaft members having a second shaft portion projecting from the first shaft portion to the opposite side to the first shaft portion are mounted on the both side pieces of the frame so as to be on the same axis, and the movable contact holder and A circuit breaker characterized in that one of the handle links is pivotally supported by the first shaft portion and the other is pivotally supported by the second shaft portion.

前記フレームをラッチして前記ハンドルのオフ位置からのオン操作により前記ハンドルリンク及び前記可動接触子ホルダの軸支位置を越えて前記可動接点を前記固定接点に接触させる方向に前記反転ばねを位置させるラッチ部材と、このラッチ部材が前記フレームのラッチを解除した状態で前記ハンドルリンク及び前記可動接触子ホルダの軸支位置を越えて前記可動接点を前記固定接点から離すように前記反転ばねを反転させる方向に前記フレームを付勢する開極ばねと、過電流が流れたときに前記ラッチ部材が前記フレームの係止部をラッチしている状態から解放して前記開極ばねにより前記可動接点を前記固定接点から強制開極させる異常電流検出装置とを備え、前記フレームに衝突片を設けるとともに、前記フレームの前記開極ばねによる動作で前記衝突片が衝突して前記可動接触子ホルダが開極方向に押圧される被衝突片を前記可動接触子ホルダに設けた請求項１記載の回路遮断器。The reversing spring is positioned in a direction in which the movable contact is brought into contact with the fixed contact beyond the handle link and the shaft support position of the movable contact holder by latching the frame and turning on the handle from the off position. A latch member, and the reversing spring is reversed so that the movable contact is separated from the fixed contact beyond the handle link and the shaft support position of the movable contact holder in a state where the latch of the frame is released. An opening spring that biases the frame in a direction, and when the overcurrent flows, the latch member releases the latching portion of the frame to release the movable contact by the opening spring. An abnormal current detection device that forcibly opens a contact from a fixed contact, and a collision piece is provided on the frame, and the opening spring of the frame Circuit breaker according to claim 1, wherein providing the the struck member to the movable contact holder movable contact holder the collision pieces collide with operation is pressed in the opening direction that.

前記器体に、一端側を固定端とするとともに他端側を自由端として前記一端を支点として変形自在に配設された弾性係止部材を配設し、前記弾性係止部材は、前記自由端の両側に当接片及び係止片を二股状に形成するとともに前記当接片及び前記係止片間で前記自由端の端面から所定距離の位置に逃げ部が形成され、前記フレームが前記ラッチ部材にラッチされている状態のときに前記逃げ部に臨む突部を前記フレームに設けるとともに、前記ハンドルが少なくともオン位置にあるときに前記当接片が当接するとともに前記係止片に対向して段差形成され、前記突部が前記逃げ部から移動して前記弾性係止部材を押圧するとき前記係止片に引っ掛かる引掛部を有する延出片を前記ハンドルに設けた請求項２記載の回路遮断器。The container is provided with an elastic locking member having one end side as a fixed end and the other end side as a free end and deformable with the one end as a fulcrum. A contact piece and a locking piece are formed in a bifurcated shape on both sides of the end, and a relief portion is formed between the contact piece and the locking piece at a predetermined distance from the end surface of the free end, and the frame is A protrusion is provided on the frame that faces the escape portion when latched by the latch member, and the contact piece abuts and faces the locking piece when the handle is at least in the on position. 3. The circuit according to claim 2, wherein the handle is provided with an extending piece that is formed with a step and has a hook portion that is hooked on the locking piece when the protrusion moves from the escape portion and presses the elastic locking member. Circuit breaker.

前記可動接触子は、前記反転ばねを懸架するばね保持片と、基端を前記ばね保持片に連設するとともに先端側に前記可動接点を固着し、前記ばね保持片に反転ばねを懸架した状態で固定接触子方向に付勢された可動接触子本体とを有し、前記可動接触子ホルダは、前記反転ばねのばね力によって前記ばね保持片が当接して前記可動接触子が外れるのを防止する抜け止め部と、反転ばねのばね力によって前記可動接触子本体の可動接点固着面側が当接する可動接触子当接部とが形成された請求項１、請求項２または請求項３記載の回路遮断器。The movable contact includes a spring holding piece for suspending the reversing spring, a base end connected to the spring holding piece, the movable contact fixed to the distal end side, and a reversing spring suspended from the spring holding piece. The movable contact holder is biased in the direction of the fixed contact, and the movable contact holder prevents the movable contact from coming off due to the spring holding piece coming into contact with the spring force of the reversing spring. The circuit according to claim 1, 2 or 3, wherein a retaining portion to be moved and a movable contact abutting portion with which a movable contact fixing surface side of the movable contact main body abuts by a spring force of a reversing spring are formed. Circuit breaker.

前記可動接触子ホルダに、前記可勤接触子当接部から前記可動接触子の厚みよりも広い間隔をおいて前記可動接触子本体の可動接点固着面とは反対側面が対向する可動接触子移動防止部を設けた請求項４記載の回路遮断器。The movable contact is moved so that the side opposite to the movable contact fixing surface of the movable contact main body faces the movable contact holder at a distance wider than the thickness of the movable contact from the work contact contact portion. The circuit breaker of Claim 4 which provided the prevention part.

前記ハンドルリンクのハンドル回転方向における両側に係止部を各々設けるとともに、前記ハンドルの回転方向両側に前記ハンドルリンクの側面側からスライドさせて各係止部に係止される被係止部を各々設け、前記ハンドルを前記ハンドルリンクに係止可能な姿勢に前記ハンドルリンクを前記反転ばねに抗して支持する支持用ピンを受ける切溝を前記フレームに形成した請求項１、請求項２、請求項３、請求項４または請求項５記載の回路遮断器。Locking portions are provided on both sides of the handle link in the handle rotation direction, respectively, and locked portions that are slid from the side surface side of the handle link and locked to the lock portions on both sides of the handle rotation direction, respectively. A cut groove is provided in the frame for receiving a support pin for supporting the handle link against the reversing spring in a posture capable of locking the handle to the handle link. The circuit breaker according to claim 3, 4 or 5.