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JP3763250B2 - Circuit breaker trip device - Google Patents
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JP3763250B2 - Circuit breaker trip device - Google Patents

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Publication number
JP3763250B2
JP3763250B2 JP2000207585A JP2000207585A JP3763250B2 JP 3763250 B2 JP3763250 B2 JP 3763250B2 JP 2000207585 A JP2000207585 A JP 2000207585A JP 2000207585 A JP2000207585 A JP 2000207585A JP 3763250 B2 JP3763250 B2 JP 3763250B2
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Japan
Prior art keywords
iron core
bimetal
contact
core
spring
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JP2002025415A (en
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知行 澤田
哲靖 川本
初男 水野
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、通電電路に過大電流が流れたときに第１鉄心および第２鉄心の離間側を近接させて係止部に係止された開閉機構の一部を解除し、接点を強制開極する回路遮断器の引外し装置に関するものである。
【０００２】
【従来の技術】
一般に、回路遮断器は、電源と負荷との間の通電電路に挿入された接点を閉極した状態でばね等により開極方向の力を蓄えた状態で係止され、過電流ないし短絡電流のような異常電流が通電電路を通過すると、異常電流を検出する引外し装置によって係止状態が解除され接点が強制開極されるように構成されている。
【０００３】
引外し装置としては、たとえば、特開平６−１６２９１０号公報に記載されたもののように、通電電路に挿入したバイメタルが吸着片を保持し、磁性材料のラッチ可動片を吸着片に対向して配置した構成を採用したものがある。ラッチ可動片はバイメタルの一端部に係止されており、通電電路に過電流が流れバイメタルが自己発熱によって撓むとラッチ可動片もバイメタルとともに撓んでラッチを解除する。また、通電電路に短絡電流が流れると吸着片がラッチ可動片を磁力により吸引してラッチを解除する。このように、過電流に対してはバイメタルの自己発熱による撓みを利用し、短絡電流に対しては磁力を利用する構成を採用している。
【０００４】
【発明が解決しようとする課題】
上述したものにあっては、ラッチ可動片自体に開閉機構部の被係止部を係止する係止部が一体形成されているので、開閉機構部の被係止部を係止するための別部材を必要とせず組立性が向上している。
【０００５】
しかしながら、上述の短絡電流が流れたときの引外し装置である引外し装置を構成する吸引鉄片の先端とラッチ可動片との間を離間させているので、引外し装置自体の配設スペースを大きくとる必要があり、また離間しているため吸引鉄粉とラッチ可動片との間の吸引力が弱くなるという問題があった。
【０００６】
本発明は上記事由に鑑みて為されたものであり、その目的は、組立性が向上し、小型化が図れ、しかも係止状態を解除する際の電磁吸引力を強くすることができる回路遮断器の引外し装置を提供することにある。
【０００７】
【課題を解決するための手段】
請求項１の発明は、電源と負荷との間の通電電路に挿入された接点と、接点の閉極時に接点を開極する向きの力を蓄えて係止状態とし係止状態が解除されると前記力により接点を強制開極させる開閉機構とを器体に備える回路遮断器に用いられ、接点の閉極時に過電流または大電流が前記通電電路に流れると前記係止状態を解除して接点を強制開極させる引外し装置であって、前記通電電路に挿入され長手方向の一端部を固定端とし他端部を自由端とし通電電路に過電流が流れると固定端に対して自由端が厚み方向に変位するバイメタルと、接点の閉極時に開閉機構の一部を係止して係止状態とする係止部を備えた第１鉄心と、第１鉄心に設けた第１の主鉄心とともにバイメタルの長手方向の中間部を囲繞するように配置される第２の主鉄心を備える第２鉄心と、過電流によりバイメタルの自由端が固定端に対して変位したときに第１鉄心がバイメタルとともに変位して係止部と開閉機構との係止状態が解除されるように第１鉄心をバイメタルの自由端と連結する板ばねよりなる保持ばねと、第１の主鉄心と第２の主鉄心との対向面においてバイメタルの長手方向に沿った一端部では互いに当接し他端部では互いに離間するように第１鉄心と第２鉄心とを連結する板ばねよりなる取付ばねとを設け、通電電路に大電流が流れると第１鉄心と第２鉄心との間に吸引力が作用し第１の主鉄心と第２の主鉄心との間の離間した部位が吸着されて開閉機構と係止部との係止状態が解除される構成とし、第２鉄心の第１鉄心に向かう向きの移動を規制するように第２鉄心の一部に当接する移動規制部を器体に設けたものである。
この構成によれば、第１の主鉄心と第２の主鉄心との一部が当接しているので、電磁吸引力が大きくなり、各鉄心の大きさを小さくできる。また、係止部を第１鉄心に一体形成しているので、第１鉄心とは別体の係止部材を必要とせず、部品点数を少なくすることができる。その結果、組立性が向上し、小型化が図れるとともに第１鉄心および第２鉄心間の吸引力を強くすることができる。さらに、過電流が流れるとバイメタルが変位し、このバイメタルの変位によって保持ばねを介して係止部を有する第１鉄心が駆動され、開閉機構と係止部との係止状態を解除して接点を強制開極することができる。加えて、短絡電流等の大電流が流れると、係止部を有する第１鉄心が、第２鉄心に近付く向きに移動し、開閉機構と係止部との係止状態を解除して接点を強制開極させることができる。また、過電流が流れると、バイメタルの変位に伴ってバイメタルとともに第１鉄心および第２鉄心の両方が移動することとなり、もってバイメタルの反りを防止し、過電流引外し特性のばらつきを抑えることができる。
【０００９】
請求項２の発明は、請求項１の発明において、前記開閉機構と前記係止部との係止状態において開閉機構から係止部に作用する力の向きを、前記バイメタルの固定端から自由端に向かう向きとしたものである。この構成によれば、過電流が流れたときに、バイメタルの固定端を支点としてバイメタルの自由端側が開閉機構から係止部に作用する力を弱める向きに移動するので、開閉機構と係止部との係止状態を素早く解除することができる。
【００１０】
請求項３の発明は、請求項１の発明において、前記開閉機構と前記係止部との係止状態において開閉機構から係止部に作用する力の向きを、前記バイメタルの自由端から固定端に向かう向きとしたものである。この構成によれば、過電流が流れたときに、バイメタルの固定端を支点としてバイメタルの自由端側が開閉機構から係止部に作用する力を強める向きに移動するので、開閉機構を係止部に確実に係止させ易くなる。
【００１２】
請求項４の発明は、電源と負荷との間の通電電路に挿入された接点と、接点の閉極時に接点を開極する向きの力を蓄えて係止状態とし係止状態が解除されると前記力により接点を強制開極させる開閉機構とを器体に備える回路遮断器に用いられ、接点の閉極時に過電流または大電流が前記通電電路に流れると前記係止状態を解除して接点を強制開極させる引外し装置であって、前記通電電路に挿入され長手方向の一端部を固定端とし他端部を自由端とし通電電路に過電流が流れると固定端に対して自由端が厚み方向に変位するバイメタルと、接点の閉極時に開閉機構の一部を係止して係止状態とする係止部を備えた第１鉄心と、第１鉄心に設けた第１の主鉄心とともにバイメタルの長手方向の中間部を囲繞するように配置される第２の主鉄心を備える第２鉄心と、過電流によりバイメタルの自由端が固定端に対して変位したときに第１鉄心がバイメタルとともに変位して係止部と開閉機構との係止状態が解除されるように第１鉄心をバイメタルの自由端と連結し、かつ第１の主鉄心と第２の主鉄心との対向面においてバイメタルの長手方向に沿った一端部では互いに当接し他端部では互いに離間するように第１鉄心と第２鉄心とを連結する板ばねよりなる取付保持ばねとを設け、通電電路に大電流が流れると第１鉄心と第２鉄心との間に吸引力が作用し第１の主鉄心と第２の主鉄心との間の離間した部位が吸着されて開閉機構と係止部との係止状態が解除される構成とし、第２鉄心の第１鉄心に向かう向きの移動を規制するように第２鉄心の一部に当接する移動規制部を器体に設けたものである。
この構成によれば、第１の主鉄心と第２の主鉄心との一部が当接しているので、電磁吸引力が大きくなり、各鉄心の大きさを小さくできる。また、係止部を第１鉄心に一体形成しているので、第１鉄心とは別体の係止部材を必要とせず、部品点数を少なくすることができる。その結果、組立性が向上し、小型化が図れるとともに第１鉄心および第２鉄心間の吸引力を強くすることができる。さらに、保持ばねと取付ばねとの機能を一体化した取付保持ばねを用いるから、部品点数を削減して組立性を向上させることができる。
【００２０】
請求項５の発明は、電源と負荷との間の通電電路に挿入された接点と、接点の閉極時に接点を開極する向きの力を蓄えて係止状態とし係止状態が解除されると前記力により接点を強制開極させる開閉機構とを器体に備える回路遮断器に用いられ、接点の閉極時に過電流または大電流が前記通電電路に流れると前記係止状態を解除して接点を強制開極させる引外し装置であって、前記通電電路に挿入され長手方向の一端部を固定端とし他端部を自由端とし通電電路に過電流が流れると固定端に対して自由端が厚み方向に変位するバイメタルと、接点の閉極時に開閉機構の一部を係止して係止状態とする係止部を備えた第１鉄心と、第１鉄心に設けた第１の主鉄心とともにバイメタルの長手方向の中間部を囲繞するように配置される第２の主鉄心を備える第２鉄心と、第１鉄心から延出され過電流によりバイメタルの自由端が固定端に対して変位したときにバイメタルの自由端に押圧されることにより第１鉄心をバイメタルとともに変位させて係止部と開閉機構との係止状態を解除させる駆動部と、第１の主鉄心と第２の主鉄心との対向面においてバイメタルの長手方向に沿った一端部では互いに当接し他端部では互いに離間するように第１鉄心と第２鉄心とを連結する板ばねよりなる取付ばねと、取付ばねとバイメタルとが固着されバイメタルとともに通電電路を形成するバイメタル固定板とを備え、通電電路に大電流が流れると第１鉄心と第２鉄心との間に吸引力が作用し第１の主鉄心と第２の主鉄心との間の離間した部位が吸着されて開閉機構と係止部との係止状態が解除される構成とし、第２鉄心の第１鉄心に向かう向きの移動を規制するように第２鉄心の一部に当接する移動規制部を器体に設けたものである。
この構成によれば、第１の主鉄心と第２の主鉄心との一部が当接しているので、電磁吸引力が大きくなり、各鉄心の大きさを小さくできる。また、係止部を第１鉄心に一体形成しているので、第１鉄心とは別体の係止部材を必要とせず、部品点数を少なくすることができる。その結果、組立性が向上し、小型化が図れるとともに第１鉄心および第２鉄心間の吸引力を強くすることができる。さらに、過電流が流れるとバイメタルが変位し、バイメタルで駆動部を駆動して開閉機構と係止部との係止状態を解除して接点を強制開極することができる。加えて、バイメタルおよび係止部を有した第１鉄心を一つの固定電路に連結するから、ブロック化が図れて収納性が向上する。
【００２１】
【発明の実施の形態】
（第１の実施の形態）
本実施形態の回路遮断器は、図１に示すように、合成樹脂成形品である直方体状の器体１を有し、器体１内には、器体１の幅方向（図１の面に直交する方向）に並設された２組の接点２ａ，２ｂと、接点２ａ，２ｂを一括して開閉する開閉機構３と、接点２ａ，２ｂが挿入された通電電路に異常電流が通過したときに接点２ａ，２ｂを強制開極させるように開閉機構３を作動させる引外し装置４とが収納される。接点２ａ，２ｂは器体１に固定された２個の固定接点２１ａ，２１ｂと、各固定接点２１ａ，２１ｂに離接する可動接点２２ａ，２２ｂとを備えている。すなわち、本実施形態では２極の回路遮断器を示す。
【００２２】
固定接点２１ａは、図の正面側に開放された断面コ字状の端子板２３から延設された接点保持片２３ａに固着される。接点保持片２３ａは端子板２３の下片の側縁から下向きに延長された後に器体１の下壁に沿って端子板２３から離れる向きに延長されたＬ字状に形成され、器体１の下面に沿って延長されている部位の上面に固定接点２１ａが露出する。また、端子板２３は、器体１の側面（図１の左側面）に近い部位ほど上片と下片とが器体１の下壁との距離を広げるように、器体１の下壁に対して斜めに傾斜するように配置される。端子板２３の上片と下片との間には鎖錠ばね２４が配置される。鎖錠ばね２４は帯状の板ばねの長手方向の一端部をＪ字状に曲成して鎖錠片２４ａを形成し他端部をＳ字状に曲成して接触片２４ｂを形成した略ム字状であって、鎖錠片２４ａおよび接触片２４ｂが端子板２３の上片に向き合うように配置される。したがって、器体１の側壁に形成した電線挿入孔１１を通して器体１に挿入される電線が鎖錠片２４ａおよび接触片２４ｂと端子板２３の上片との間に鎖錠片２４ａ側から挿入されると、鎖錠片２４ａおよび接触片２４ｂのばね力によって端子板２３の上片との間に電線が挟持されて電線が端子板２３に電気的に接続され、さらに鎖錠片２４ａが電線に食い込んで電線の引き抜きが防止される（すなわち、鎖錠される））。この種の端子の構造は速結端子構造として周知のものである。端子板２３には鎖錠ばね２４を位置決めするための突起２３ｃが切り起こして形成されている。
【００２３】
端子板２３と鎖錠ばね２４とにより保持された電線の鎖錠状態を解除するために、器体１の上面に設けた露出窓１２から操作部２５ａが露出する解除ハンドル２５が設けられており、解除ハンドル２５は下部の両側面に設けた軸支部２５ｂが器体１に対して軸支され、露出窓１２の範囲内で操作部２５ａが移動可能になっている。解除ハンドル２５の下部には鎖錠片２４ａに当接可能な解除突起２５ｃが突設され、操作部２５ａを手操作して解除ハンドル２５を軸支部２５ｂの回りで図の反時計方向に回転させると、解除突起２５ｃが鎖錠片２４ａの先端部を下向きに押して端子板２３の上片から鎖錠片２４ａを引き離して電線の鎖錠状態を解除する。この状態においては電線は引き抜き可能になる。ここに、鎖錠片２４ａにおいて電線を保持する部位と解除突起２５ｃが当接する部位とはずらしてある。
【００２４】
一方、固定接点２１ｂは、端子板２３の背方に配置された断面コ字状の端子板から延設した接点保持片２３ｂに固着される。接点保持片２３ｂは端子板の下片の側縁から上向きに延長された後に端子板から離れる向きに延長されたＬ字状に形成され、器体１の内面に設けた隔壁部１３に沿うように配置される。この接点保持片２３ｂの先端部の上面に固定接点２１ｂが突出する。この端子板は端子板２３と同様に器体１の下壁に対して斜めに傾斜するように配置され、鎖錠ばね２４と同構成を有した鎖錠ばね（図示せず）を保持する。また、鎖錠ばねに対応するように解除ハンドル２５と同構成を有した解除ハンドルが設けられる。つまり、解除ハンドル２５は各鎖錠ばね２４ごとに独立して個別に設けられる。
【００２５】
上述した構成から明らかなように、固定接点２１ａは固定接点２１ｂよりも下側に配置されることになる。各固定接点２１ａ，２１ｂにそれぞれ対応する可動接点２２ａ，２２ｂはそれぞれ開閉機構３に連結された可動接触子２６ａ，２６ｂの端部に保持され、可動接触子２６ａ，２６ｂにおいて可動接点２２ａ，２２ｂを設けた端部は開閉機構３により駆動されて上下に移動する。ここに、下側の固定接点２１ａに対応する可動接触子２６ａは移動範囲の上端位置において上側の固定接点２１ｂに干渉しないように配置される。また図示していないが、両接点２ａ，２ｂ間には絶縁材料からなる隔壁部材が配置され、両接点２ａ，２ｂの間の絶縁距離が保たれている。
【００２６】
開閉機構３は、器体１の上面に開口する窓孔１４を通して起伏する操作部３１ａを備えたハンドル３１を有し、操作部３１ａの一端部には回転部３１ｂが一体に形成され、回転部３１ｂは窓孔１４の内側で器体１に支承されるハンドル軸３１ｃを備える。したがって、ハンドル３１は操作部３１ａが窓孔１４の開口面と略面一になる位置と、操作部３１ａが窓孔１４から突出する位置との間で起伏自在になっている。器体１における窓孔１４の内周面には、ハンドル３１の回転部３１ｂに設けた案内突起３１ｄが摺接する弧状の案内面１４ａが形成され、ハンドル３１の起伏時に案内突起３１ｄが案内面１４ａに摺接することによってハンドル３１が滑らかに起伏する。また、窓孔１４にはストップ１４ｂが突設され、ハンドル３１を倒したときに操作部３１ａがストップ１４ｂに当接することによってハンドル３１の位置が規制される。
【００２７】
ハンドル３１の回転部３１ｂにはコ字状のリンク３２の上端部が軸着され、リンク３２の下端部には作動板３３が軸着される。また、開閉機構３は、可動接触子２６ａ，２６ｂを保持する合成樹脂成形品の保持体３４を備え、保持体３４の上端部側面には軸部３４ｃが突設され、軸部３４ｃは器体１に回転自在に軸支される。保持体３４の下端部と器体１の底部との間にはコイルばねからなる開極ばね３５が保持され、保持体３４は開極ばね３５のばね力によって図１における時計方向に付勢されている。ここにおいて、可動接触子２６ｂは合成を有する導電性金属板により短冊状に形成され長手方向の中間部が保持体３４の一方の側面（図１の裏面）に設けた切溝３４ｂに挿通され、可動接触子２６ｂの下面と保持体３４との間にはコイルばねからなる接圧ばね３６が挟持される。また、保持体３４の他方の側面（図１の正面）に設けた切溝３４ａには薄肉の導電性金属板により形成された可動接触子２６ａの中間部が挿入される。上述したハンドル３１、リンク３２、作動板３３、保持体３４、開極ばね３５、接圧ばね３６は開閉機構３を構成しており、開閉機構３は後述する引外し装置４と連携して動作することによって、接点２ａ，２ｂを開閉させる。
【００２８】
ところで、作動板３３は短冊状に形成された主片３３ａを有し、主片３３ａの長手方向の中間部の両側に垂設された軸受片３３ｂを備える。軸受片３３ｂは先端部が弧状に形成され、保持体３４の上面において軸部３４ｃよりも接点２ａ，２ｂ寄りに突設された突起部３４ｄに当接可能になっている。主片３３ａにおける接点２ａ，２ｂ側の一端部は突起部３４ｄの先端に当接可能であって、主片３３ａにおける他端部は引外し装置４に設けた係止部としてのラッチ突起４１ａ（後述する）に係合可能になっている。
【００２９】
器体１の右側部には分電盤内に配設される導電バー（図示せず）に接続可能な端子台５０が設けられる。端子台５０は上下３箇所に挿入溝５１ａ〜５１ｃを有し、各挿入溝５１ａ〜５１ｃのうちの上下の2個の挿入溝５１ａ，５１ｃに対応して刃受ばね５２ａ，５２ｃが配置される。各刃受ばね５２ａ，５２ｂは上下一対のばね片を備え、両ばね片の間に導電バーを挟むことによって導電バーに電気的に接続されるようにしてある。上側の刃受ばね５２ａには可動接触子２６ａの一端部が固着されており、可動接触子２６ａは器体１の下部まで延長された後、器体１の下壁に沿って延長され、さらに可動接点２２ａが固着されている部位に向かって器体１の下壁との距離を大きくするように傾斜した傾斜片２６ｃが延長形成される。可動接触子２６ａは傾斜片２６ｃの先端から延長形成された接点保持片２６ｄを備え、接点保持片２６ｄの中間部が保持体３４に設けた切溝３４ａに挿入されている。一方、下側の刃受ばね５２ｂには上方向に延長されたバイメタル固定板５３が固定電路として固着される。バイメタル固定板５３の上端部は器体１の内周面に設けた保持部１ａにより保持され、バイメタル固定板５３において保持部１ａよりも上方には図１の正面側に開放されたコ字状の固定片５３ａが設けられ、固定片５３ａの一端部には引外し装置４を構成するバイメタル４２の上端部が固着される。つまり、バイメタル４２の上端部がバイメタルの固定端になり、下端部がバイメタル４２の自由端になる。
【００３０】
図５および図６に示すように、バイメタル４２の下端部の両側縁には板ばねよりなる保持ばね４３が固定される。保持ばね４３はバイメタル４２に当接する固定片４３ａを下端部に備え、固定片４３ａの両側縁にはバイメタル４２の下部両側縁に設けた切欠溝４２ａに係合する形でバイメタル４２にかしめ固定されるかしめ片４３ｂが設けられる。また、固定片４３ａの上縁からはバイメタル４２から離れる向きに撓み片４３ｃが延長され、撓み片４３ｃの先端から上方に向かって取付片４３ｄが延長される。取付片４３ｄはフェライトのような磁性体からなる第１鉄心４１の下部に重ね合わされる。取付片４３ｄの両側縁にはかしめ片４３ｅが設けられ、かしめ片４３ｅが第１鉄心４１にかしめ固定される。
【００３１】
第１鉄心４１は、バイメタル４２の中間部における厚み方向の一面および両側面を囲むコ字状ないしＵ字状に形成された主鉄心４１ｂを備え、主鉄心４１ｂの下端からは固定片４１ｃが突設され、主鉄心４１ｂの上端からは位置規制片４１ｄが突設される。つまり、主鉄心４１ｂはバイメタル４２の幅方向の両側に配置された一対の側片を有し両側片をバイメタル４２の厚み方向の一面側で連結した形状に形成されていることになる。固定片４１ｃの両側縁には固定溝４１ｅが形成され、固定溝４１ｅにかしめ片４３ｅが係合してかしめ固定されることにより、第１鉄心４１に保持ばね４３が固定される。第１鉄心４１の外側面にはラッチ突起４１ａが突設され、ラッチ突起４１ａには上述した開閉機構３の作動板３３の一端部が係止可能になっている。
【００３２】
ところで、第１鉄心４１の主鉄心４１ｂは上述のようにコ字状ないしＵ字状に形成されているから、図１における主鉄心４１ｂの右端面（図５の左端面）は開放され磁極面４１ｆを形成している。一方、磁極面４１ｆに対向する形でフェライトのような磁性体からなる第２鉄心４４が配設され、第２鉄心４４は板ばねよりなる取付ばね４５を介して第１鉄心４１に結合されている。第２鉄心４４は矩形状に形成された主鉄心４４ａにおける第１鉄心４１との対向面にダボ４４ｂが突設され、主鉄心４４ａの上面には位置規制突起４４ｃが突設される。一方、取付ばね４５は、ダボ４４ｂが挿入固定される固定孔４５ａを有した固定片４５ｂを備え、固定片４５ｂの下端部には第２鉄心４４から離れる向きに屈曲されたばね片４５ｃが形成され、ばね片４５ｃの下端縁には第１鉄心４１の主鉄心４１ｂの下面を受ける受け片４５ｄが形成されている。受け片４５ｄの両側縁には主鉄心４１ｂの外側面に当接可能な抱え片４５ｅが上向きに突設され、各抱え片４５ｅにおいて固定片４５ｂから遠い側の端縁には、主鉄心４１ｂの外側面に形成された２個の引掛溝４１ｇにそれぞれ係合する引掛片４５ｆが突設される。つまり、第２鉄心４４に固定された取付ばね４５が第１鉄心４１に係合することによって第１鉄心４１と第２鉄心４４とが取付ばね４５を介して連結されるのである。
【００３３】
以上説明したように、バイメタル４２に保持ばね４３を介して第１鉄心４１が結合され、第２鉄心４４が取付ばね４５を介して第１鉄心４１に結合されるから、第１鉄心４１とバイメタル４２と保持ばね４３と第２鉄心４４と取付ばね４５とは一体化され、引外し装置４を１つの部材として扱うことが可能になる。ここに、バイメタル４２は第１鉄心４１の主鉄心４１ｂと第２鉄心４４の主鉄心４４ａとに囲まれる空間内に挿通され、バイメタル４２への通電に伴ってバイメタル４２の周囲に形成される磁束が第１鉄心４１および第２鉄心４４を通るようにしてある。
【００３４】
ところで、第１鉄心４１の磁極面４１ｆは第２鉄心４４に対向しており、バイメタル４２に電流が流れていない状態では、磁極面４１ｆと第２鉄心４４とは下端部のみ当接し、上端部は互いに離れるように配置される。また、器体１に引き外し装置４を組み付けた状態では、第１鉄心４１の位置規制片４１ｄが器体１の内周面に突設した位置規制突起１ｂに当接し、第２鉄心４４の位置規制突起４４ｃが器体１の内周面に設けた移動規制部としての位置規制溝１ｃに挿入される。
【００３５】
引外し装置４に設けたバイメタル４２の上端部は上述のようにバイメタル固定板５３を介して刃受ばね５２ｃに接続されている。また、バイメタル４２の下端部は編組線４７を介して可動接触子２６ｂの一端部に接続されている。したがって、刃受ばね５２ｃと図示しない端子板（端子板２３の背面側の端子板）との間には、バイメタル固定板５３−バイメタル４２−編組線４７−可動接触子２６ｂ−可動接点２２ｂ−固定接点２１ｂ−接点保持片２３ｂの経路の通電電路が形成される。さらに、刃受ばね５２ａと端子板２３との間には、可動接触子２６ａ−可動接点２２ａ−固定接点２１ａ−接点保持片２３ａの経路の通電電路が形成される。
【００３６】
次に、本実施形態の動作を説明する。図１は接点２ａ，２ｂの閉極状態を示しており、この状態ではハンドル３１が倒されて操作部３１ａがストップ１４ｂに当接し、リンク３２の上端はハンドル軸３１ｃよりも左側に位置している。リンク３２の下端に連結された作動板３３の左端部は、保持体３４に設けた突起部３４ｄに当接し、開極ばね３５のばね力によってリンク３２との結合部の回りに時計方向の回転力を受ける。ここで、作動板３３の右端部は第１鉄心４１に設けたラッチ突起４１ａの上に係止されているから、作動板３３は回転せず、結果的に保持体３４は開極ばね３５を圧縮して可動接触子２６ａ，２６ｂを下向きに押し付けることになり、可動接点２２ａ，２２ｂが固定接点２１ａ，２１ｂに接触することになる。このとき、開極ばね３５のばね力によって作動板３３を押し上げる向きの力が作用するが、リンク３２の上端がハンドル軸３１ｃよりも左側に位置するからハンドル３１には時計方向の回転力が作用し、ハンドル３１は倒された位置に保たれる。また、切溝３４ａの上壁が可動接触子２６ａの接点保持片２６ｄを上から押さえることによって、可動接点２２ａの固定接点２１ａに対する接触圧が得られるようになっており、可動接触子２６ｂについても切溝３４ｂの上壁に一部が接触した状態で接圧ばね３６のばね力が作用することによって可動接点２２ｂの固定接点２１ｂに対する接触圧が得られるようになっている。
【００３７】
一方、図１の閉極状態からハンドル３１を図２のように起こすと、リンク３２の上端がハンドル軸３１ｃの右側に位置するように引き上げられ、作動板３３が上方に引き上げられるから保持体３４は作動板３３に接触しなくなり、開極ばね３５のばね力によって保持体３４が時計方向に回転することになる。その結果、保持体３４に保持された可動接触子２６ａ，２６ｂが引き上げられ、可動接点２２ａ，２２ｂが固定接点２１ａ，２１ｂから上方に離れて開極する。すなわち、ハンドル３１の操作部３１ａを起こすことによって開極状態になる。ここに、開極状態では保持体３４の下部が隔壁部１３に当接することによって保持体３４の時計方向への回転位置が規制される。
【００３８】
ところで、図１の閉極状態においてバイメタル４２を含む通電電路に過電流が流れると、バイメタル４２は図３および図８に示すように、下端部を図の右側に変位させるように撓み、バイメタル４２に対して保持ばね４３を介して連結されている第１鉄心４１の下端部が上端部に対して右側に移動するから、ラッチ突起４１ａと作動板３３との係止状態が解除される。その結果、作動板３３はリンク３２の下端の回りで回転可能になり、開極ばね３５のばね力により保持体３４が時計方向に回転して可動接点２２ａ，２２ｂが固定接点２１ａ，２１ｂから開極することになる。このとき、作動板３３はリンク３２の下端の回りで自由に回転することで開極ばね３５のばね力はハンドル３１に伝達されず、ハンドル３１の操作部３１ａは倒れた状態に保たれる。つまり、いわゆるトリップフリーの状態になる。この状態において保持体３４は隔壁部１３に当接することによって、回転位置が規制される。
【００３９】
バイメタル４２を含む通電電路に短絡電流のような大電流が流れたときには、バイメタル４２の周囲に生じる磁界によって第１鉄心４１と第２鉄心４４との間に吸引力が作用する。第１鉄心４１の磁極面４１ｆの下端部は第２鉄心４４と接触しているから、図４および図９に示すように、第１鉄心４１の上部と第２鉄心４４との間に吸引力が作用して第１鉄心４１の上部が図の右向きに急速に移動する。その結果、第１鉄心４１のラッチ突起４１ａは作動板３３から外れ、過電流が流れたときと同様に、可動接点２２ａ，２２ｂが固定接点２１ａ，２１ｂから開極する。また、この場合もトリップフリーの状態になる。
【００４０】
引外し装置４の動作をさらに詳しく説明する。図１の閉極状態では、第１鉄心４１のラッチ突起４１ａに作動板３３が係止されており、第１鉄心４１は保持ばね４３により上端部を図の左側に倒し、位置規制片４１ｄを器体の位置規制突起１ｂに当接させている。第１鉄心４１の磁極面４１ｆは下端のみが第２鉄心４４に接触しており、第２鉄心４４は取付ばね４５のばね片４５ｃによって左向きに付勢されている。この状態において、第２鉄心４４の上部に設けた位置規制突起４４ｃが器体１の位置規制溝１ｃの左周壁に当接し、第２鉄心４４の下部は第１鉄心４１に当接する。すなわち、第１鉄心４１は保持ばね４３によってバイメタル４２の自由端に結合され、保持ばね４３のばね力によってバイメタル４２から引き離される向きに付勢されているが、位置規制片４１ｄが器体１の位置規制突起１ｂに当接することによって、バイメタル４２との位置関係が決定される。また、取付ばね４５に設けたばね片４５ｃによって第１鉄心４１と第２鉄心４４との位置関係が決定される。
【００４１】
ここで、バイメタル４２に過電流が通過すると、図２に示すように、バイメタル４２の下端部が右側に変位するようにバイメタル４２が撓み、ラッチ突起４１ａと作動板３３との係止状態を解除する。ここで、第２鉄心４４が固定されているとすれば、第１鉄心４１の移動範囲が規制されてバイメタル４２が撓みにくくかつバイメタル４２がＳ字状に撓むことになって、バイメタル４２の本来の撓み方向とは異なる向きの力がバイメタル４２に作用することになる。このような力がバイメタル４２に作用するとバイメタル４２が塑性変形することがあり、ラッチ突起４１ａが作動板３３との係止状態を解除する電流値が大きくなって、動作すべき過電流に対して動作しないことになる。これに対して、本実施形態の構成では第２鉄心４４をバイメタル４２の撓み方向に移動可能としていることによって、バイメタル４２の下端部が右側に撓んで第１鉄心４１の下端部が右側に移動すると、第２鉄心４４が第１鉄心４１に押されて右側に移動するから、ラッチ突起４１ａが作動板３３との係止状態を解除する電流値を上昇させるような変形をバイメタル４２に生じさせることがなくなるのである。
【００４２】
バイメタル４２に短絡電流が通過したときには、図３に示すように、バイメタル４２はほとんど撓まずに第１鉄心４１が第２鉄心４４に吸着することによって、ラッチ突起４１ａと作動板３３との係止状態が解除される。つまり、短絡電流がバイメタル４２を通過するとバイメタル４２が自己発熱によって高温になるから、この状態でバイメタル４２が湾曲するとバイメタル４２が塑性変形しやすくなるが、第１鉄心４１の磁極面４１ｆの下端が第２鉄心４４に当接していることによって、第１鉄心４１と第２鉄心４４との間の磁気抵抗が比較的小さく、第１鉄心４１に生じる磁力を第２鉄心４４に効率よく作用させることができ、バイメタル４２が変形する前に、第１鉄心４１を第２鉄心４４に瞬時に吸着させ、ラッチ突起４１ａと作動板３３との係止状態を解除することができるのである。
【００４３】
（第２の実施の形態）
本実施形態は、図７ないし図９に示す構成の引外し装置４を用いるものであって、第１の実施の形態における取付ばね４５を省略し、器体１に保持されたねじりコイルばね４６を第２鉄心４４に当接させて、第２鉄心４４を第１鉄心４１に当接させる向きに付勢しているものである。
【００４４】
しかして、接点２ａ，２ｂの閉極状態では、図７に示すように、ラッチ突起４１ａが作動板３３に係止され、このときねじりコイルばね４６のばね力が第２鉄心４４を介して第１鉄心４１に伝達されることによって、第１鉄心４１の位置規制片４１ｄが器体１に設けた位置規制突起１ｂに当接し、第１鉄心４１の主鉄心４１ｂと第２鉄心４４の主鉄心４４ａとは下端部のみ当接させた状態に保たれる。また第２鉄心４４の位置規制突起４４ｃは器体１に設けた位置規制溝１ｃに挿入されているから、位置規制溝１ｃの左側の周壁に当接することで第２鉄心４４の移動も規制される。バイメタル４２に過電流が通過すれば、図８に示すように、バイメタル４２の下端部が右方に変位するように撓み、第１鉄心４１の下部が保持ばね４３とともに右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１が右方に移動することによって第２鉄心４４が右方に押され、バイメタル４２の不自然な変形が防止される。また、バイメタル４２に短絡電流が流れたときには、図９に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００４５】
（第３の実施の形態）
本実施形態は、図１０ないし図１２に示す構成の引外し装置４を用いるものであって、第１の実施の形態とは第１鉄心４１の主鉄心４１ｂと第２鉄心４４の主鉄心４４ａとの形状が入れ替わっている。つまり、第１鉄心４１は主鉄心４１ｂが平板状であって、第２鉄心４４は主鉄心４４ａが断面コ字状ないし断面Ｕ字状に形成されている。また、第１の実施の形態において説明した保持ばね４３と取付ばね４５との機能を合わせ持つ図１３に示す構成の取付保持ばね４８を用いている。
【００４６】
取付保持ばね４８は、図１３に示すように、バイメタル４２の下端部（自由端）に重複する固定片４８ａを備え、固定片４８ａの両側縁にはバイメタル４２に設けた切欠溝４２ａに係合してかしめ固定されるかしめ片４８ｂが設けられる。固定片４８ａからは上方に向かってバイメタル４２との距離を広げるように傾斜する部位を有したばね片４８ｃが延長され、ばね片４８ｃの上端縁の両側部からはバイメタル４２から離れる向きに屈曲されて第１鉄心４１の主片４１ｂの下面を受ける一対の受け片４８ｄが延長される。また、ばね片４８ｃの上端縁の中間部には上方に延長された押さえ片４８ｅが延長される。受け片４８ｄの先端縁には押さえ片４８ｅとの間で第１鉄心４１の主鉄心４１ｂを保持する一対の保持片４８ｆが上方に向かって延長され、各保持片４８ｆの上端部外側縁からは、第２鉄心４４の主鉄心４４ａの外側面に当接する一対の抱え片４８ｇが延長される。さらに各抱え片４８ｇの先端部には第２鉄心４４の主鉄心４４ａの外側面に設けた固定溝４４ｅに係合してかしめ固定されるかしめ片４８ｈが設けられる。
【００４７】
したがって、第１鉄心４１と第２鉄心４４とバイメタル４２とが取付保持ばね４８を介して一体に結合されることになる。また、ばね片４８ｃのばね力を押さえ片４８ｅから第１鉄心４１に伝達することによって、第１鉄心４１の上端部を図の左方に倒す向きのばね力を与え、またばね片４８ｃは第２鉄心４４も図の左方に倒す向き（つまり、第１鉄心４１に近付ける向き）のばね力を与える。ただし、第２鉄心４４の位置規制突起４４ｃは器体１の位置規制溝１ｃに挿入され、位置規制溝１ｃの左周壁に当接することによって第２鉄心４４の移動が規制される。
【００４８】
しかして、接点２ａ，２ｂの閉極状態では、図１０に示すように、ラッチ突起４１ａが作動板３３に係止され、このときばね片４８ｃのばね力が第１鉄心４１に伝達されることによって、第１鉄心４１の位置規制片４１ｄが器体１に設けた位置規制突起１ｂに当接し、第１鉄心４１の主鉄心４１ｂと第２鉄心４４の主鉄心４４ａとは下端部のみ当接させた状態に保たれる。バイメタル４２に過電流が通過すれば、図１１に示すように、バイメタル４２の下端部が右方に変位するように撓み、第１鉄心４１の下部が保持片４８ｆに押されて右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１が右方に移動することによって第２鉄心４４が右方に押され、バイメタル４２の不自然な変形が防止される。また、バイメタル４２に短絡電流が流れたときには、図１２に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００４９】
（第４の実施の形態）
上述した実施形態ではバイメタル４２の上端部を固定端としていたが、本実施形態では、図１４ないし図１６に示すように、刃受ばね５２ｃから延長形成されてバイメタル固定板５３にバイメタルの下端部を固定した構成としている。
【００５０】
本実施形態の引外し装置４は、断面コ字状ないし断面Ｕ字状の主鉄心４４ａを有した第２鉄心４４を用い、第１鉄心４１は平板状であって、第１鉄心４１と第２鉄心４４との対向面の上端部を当接させ下端部を離間させて配置してある。この状態で第１鉄心４１および第２鉄心４４は板ばねよりなる取付保持ばね４８により連結される。ここに、取付保持ばね４８の形状は第３の実施の形態で用いたものとほぼ同様の形状に形成されている。
【００５１】
すなわち、取付保持ばね４８は、バイメタル４２の上端部（自由端）に重複する固定片４８ａを備え、固定片４８ａの両側縁にはバイメタル４２に設けた切欠溝４２ａに係合してかしめ固定されるかしめ片４８ｂが設けられる。固定片４８ａからはＬ字状のばね片４８ｃが延設され、ばね片４８ｃの下端縁には第１鉄心４１の主片４１ｂの上面に沿った受け片４８ｄが延長される。また、受け片４８ｄの先端縁からは下方に押さえ片４８ｅが延長される。受け片４８ｄには押さえ片４８ｅとの間で第１鉄心４１の主鉄心４１ｂを保持する保持片４８ｆが下方に向かって延長され、さらに保持片４８ｆの下端部からは、第２鉄心４４の主鉄心４４ａの外側面に当接する一対の抱え片４８ｇが延長される。さらに各抱え片４８ｇの先端部には第２鉄心４４の主鉄心４４ａの外側面に設けた固定溝４４ｅに係合してかしめ固定されるかしめ片４８ｈが設けられる。
【００５２】
したがって、第１鉄心４１と第２鉄心４４とバイメタル４２とが取付保持ばね４８を介して一体に結合されることになる。また、ばね片４８ｃのばね力を押さえ片４８ｅから第１鉄心４１に伝達することによって、第１鉄心４１の下端部を図の左方に倒す向きのばね力を与え、またばね片４８ｃは第２鉄心４４の下端部も図の左方に倒す向き（つまり、第１鉄心４１に近付ける向き）のばね力を与える。第２鉄心４４の下面には位置規制突起４４ｃが突設され、この位置規制突起４４ｃは位置規制部として器体１に設けた位置規制突起１ｅに当接することによって、第２鉄心４４の下端部の左方向への移動が規制される。
【００５３】
しかして、接点２ａ，２ｂの閉極状態では、図１４に示すように、ラッチ突起４１ａが作動板３３に係止され、このときばね片４８ｃのばね力が第１鉄心４１に伝達されることによって、第１鉄心４１の位置規制片４１ｄが器体１に設けた位置規制突起１ｂに当接し、第１鉄心４１の主鉄心４１ｂと第２鉄心４４の主鉄心４４ａとは上端部のみ当接させた状態に保たれる。バイメタル４２に過電流が通過すれば、図１５に示すように、バイメタル４２の上端部が右方に変位するように撓み、第１鉄心４１の上部が保持片４８ｆに押されて右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１が右方に移動することによって第２鉄心４４が右方に押され、バイメタル４２の不自然な変形が防止される。また、バイメタル４２に短絡電流が流れたときには、図１６に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００５４】
（第５の実施の形態）
本実施形態で用いる引外し装置４は、第３の実施の形態と同様に、第１の実施の形態における保持ばねばね４３と取付ばね４５との機能を併せ持つ取付保持ばね４９を用いるものである。また、本実施形態では第１鉄心４１の主鉄心４１ｂは平板状であるが下端部がＬ字状に形成されるとともに、バイメタル４２の下端部に当接可能な押当部４１ｈが駆動部として延設されている。また、第２鉄心４４は主鉄心４４ａが断面コ字状ないし断面Ｕ字状に形成されている。なお、本実施形態における第２鉄心４４には位置規制突起４４ｃは設けておらず、第１鉄心４１と第２鉄心４４との対向部位では上端部を当接させている。
【００５５】
取付保持ばね４９は、図２０に示すように、第１鉄心４１に設けたダボ（図示せず）が挿入固定される固定孔４９ａをそれぞれ有した一対の固定片４９ｂを備え、各固定片４９ｂから上方に向かって第１鉄心４１との距離を広げるように傾斜した部位を有するばね片４９ｃが延長される。各ばね片４９ｃの上端縁は第１鉄心４１の上面に沿った連結片４９ｄにより連結され、連結片４９ｃの両側縁からは第２鉄心４４の側面に沿った一対の抱え片４９ｅが垂設され、各垂設片４９ｅの下端部には第２鉄心４４の外側面に設けた固定溝４４ｅに係合してかしめ固定されるかしめ片４９ｆが設けられる。
【００５６】
したがって、第１鉄心４１と第２鉄心４４とバイメタル４２とが取付保持ばね４９を介して一体に結合され、ばね片４９ｃのばね力によってバイメタル４２の下端部に第１鉄心４１の押当部４１ｈが当接した状態に保たれる。また、ばね片４９ｃのばね力により第１鉄心４１の上端部である位置規制片４１ｄが器体１に設けた位置規制突起１ｂに当接する。
【００５７】
しかして、接点２ａ，２ｂの閉極状態では、図１７に示すように、ラッチ突起４１ａが作動板３３に係止され、このときばね片４９ｃのばね力が第１鉄心４１に伝達されることによって、第１鉄心４１の位置規制片４１ｄが器体１に設けた位置規制突起１ｂに当接し、バイメタル４２の下端部が第１鉄心４１に設けた押当部４１ｈに当接した状態に保たれる。このとき、第１鉄心４１と第２鉄心４４との対向面では上端部のみが当接した状態（下端部は開いた状態）に保たれる。バイメタル４２に過電流が通過すれば、図１８に示すように、バイメタル４２の下端部が右方に変位するように撓み、第１鉄心４１の下端部に設けた押当部４１ｈがバイメタル４２に押圧されることによって右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１が右方に移動することによって第２鉄心４４が右方に押され、バイメタル４２の塑性変形が防止される。また、バイメタル４２に短絡電流が流れたときには、図１９に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００５８】
（第６の実施の形態）
第５の実施の形態では第２鉄心４４が可動になっているが、本実施形態は図２１ないし図２３に示すように、第２鉄心４４をバイメタル固定板５３に固定したものである。したがって、図２４に示すように、取付保持ばね４９における抱え片４９ｅが第５の実施の形態よりも長くなっている。他の構成は第５の実施の形態と同様である。
【００５９】
しかして、接点２ａ，２ｂの閉極状態では、図２１に示すように、ラッチ突起４１ａが作動板３３に係止され、このときばね片４９ｃのばね力が第１鉄心４１に伝達されることによって、第１鉄心４１の位置規制片４１ｄが器体１に設けた位置規制突起１ｂに当接し、バイメタル４２の下端部が第１鉄心４１に設けた押当部４１ｈに当接した状態に保たれる。このとき、第１鉄心４１と第２鉄心４４との対向面では上端部のみが当接した状態（下端部は開いた状態）に保たれる。バイメタル４２に過電流が通過すれば、図２２に示すように、バイメタル４２の下端部が右方に変位するように撓み、第１鉄心４１の下端部に設けた押当部４１ｈがバイメタル４２に押圧されることによって右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。また、バイメタル４２に短絡電流が流れたときには、図２３に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００６０】
（第７の実施の形態）
本実施形態で用いる引外し装置４は図２５ないし図２７に示す構成を有している。本実施形態で用いる第１鉄心４１は断面コ字状ないし断面Ｕ字状の主鉄心４１ｂの上方に軸支部４１ｉを有し、軸支部４１ｉが器体１に軸支されて第１鉄心４１の下部が図の左右に移動可能になっている。また、第１鉄心４１の主鉄心４１ｂの下方には第５の実施の形態と同様にバイメタル４２の下端部に当接可能な駆動部としての押当部４１ｈが延設される。一方、第２鉄心４４は平板状の主鉄心４４ａの下方に軸支部４４ｆを備え、軸支部４４ｆが器体１に軸支される。また、軸支部４４ｆの回りにはねじりコイルばねからなる復帰ばね６１が設けられ、第２鉄心４４を図における反時計方向に付勢している。この復帰ばね６１によるばね力は第２鉄心４４を介して第１鉄心４１にも伝達され、第１鉄心４１を軸支部４４ｆよりも下方で押圧するから、第１鉄心４１の下部を図の左方に付勢することになる。ここに、第１鉄心４１の下端部は器体１の内周面に設けた位置規制凸部１ｄに当接することで移動範囲が規制される。また、第１鉄心４１の下部が位置規制凸部１ｄに当接しているときに、第１鉄心４１の主鉄心４１ｂと第２鉄心４４の主鉄心４４ａとの対向面は上端部のみ接触し下端部は離間する。
【００６１】
しかして、接点２ａ，２ｂの閉極状態では、図２５に示すように、ラッチ突起４１ａが作動板３３に係止され、このとき復帰ばね６１のばね力が第２鉄心４４を介して第１鉄心４１に伝達されることによって、第１鉄心４１の下部が器体１に設けた位置規制凸部１ｄに当接した状態に保たれる。また、この状態においてバイメタル４２の下端部は第１鉄心４１に設けた押当部４１ｈに当接し、第１鉄心４１と第２鉄心４４との対向面では上端部のみが当接した状態（下端部は開いた状態）に保たれる。バイメタル４２に過電流が通過すれば、図２６に示すように、バイメタル４２の下端部が右方に変位するように撓み、第１鉄心４１の下端部に設けた押当部４１ｈがバイメタル４２に押圧されることによって右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１が右方に移動することによって第２鉄心４４が右方に押され、バイメタル４２の塑性変形が防止される。また、バイメタル４２に短絡電流が流れたときには、図２７に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。なお、第１鉄心４１の移動範囲は器体１に設けた位置規制突起１ｅにより規制される。他の構成および動作は第１の実施の形態と同様である。
【００６２】
（第８の実施の形態）
本実施形態で用いる引外し装置４は図２８ないし図３０に示す構成を有している。本実施形態で用いる第１鉄心４１は第５の実施の形態と同様に下部がＬ字状に形成されるとともにバイメタル４２の下端部に当接可能な押当部４１ｈを備える。一方、第２鉄心４４は主鉄心４４ａが断面コ字状ないし断面Ｕ字状に形成され、主鉄心４４ａの下面側には位置規制突起４４ｃが突設されている。この位置規制突起４４ｃは器体１の内周面に設けた位置規制突起１ｅによって図の左方への移動が規制されている。バイメタル４２は上端部がＬ字状に折曲されており、バイメタル４２に対向する固定電路としてのバイメタル固定板５３に設けた固定片５３ａの下面側に固着される。固定片５３ａには第１鉄心４１と第２鉄心とを連結するための取付ばね４５に設けたＬ字状の固定片４５ｇが図の点Ｘにおいて固着される。取付ばね４５の固定片４５ｇの下部は第１鉄心４１の上端部に図の点Ｙにおいて固着される。固定片４５ｇの下端部からは第２鉄心４４の外側面に当接する一対の抱え片４５ｅが延長され、抱え片４５ｅの先端部には第２鉄心４４に設けた固定溝４４ｅにかしめ固定されるかしめ片４５ｆが形成されている。取付ばね４５は第１鉄心４１の下部を図の左向きに付勢しており、第１鉄心４１の下部は器体１に設けた位置規制凸部１ｄにより左方への移動が規制される。
【００６３】
本実施形態の構成では、第１鉄心４１と第２鉄心４４とが取付ばね４５を介して一体に結合され、取付ばね４５とバイメタル４２とがバイメタル固定板５３に固着されることによって、バイメタル４２と第１鉄心４１と第２鉄心４４とが一体化されていることになる。
【００６４】
しかして、接点２ａ，２ｂの閉極状態では、図２８に示すように、ラッチ突起４１ａが作動板３３に係止され、このとき取付ばね４５のばね力により第１鉄心４１の下部が図の左方に付勢され、第１鉄心４１の下部が位置規制凸部１ｄに当接するとともに、第２鉄心４４が第１鉄心４１寄りに引きつけられ、第２鉄心４４が位置規制突起１ｅに当接する。この状態において第１鉄心４１と第２鉄心４４との対向面では上端部のみが当接した状態（下端部は開いた状態）に保たれる。バイメタル４２に過電流が通過すれば、図２９に示すように、バイメタル４２の下端部が右方に変位するように撓み、第１鉄心４１の下端部に延設された駆動部としての押当部４１ｈがバイメタル４２に押圧されることによって右方に移動するからラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１が右方に移動することによって第２鉄心４４が右方に押され、バイメタル４２の塑性変形が防止される。また、バイメタル４２に短絡電流が流れたときには、図３０に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００６５】
（第９の実施の形態）
本実施形態で用いる引外し装置４は図３１ないし図３３に示す構成を有している。本実施形態では第６の実施の形態と同様に、第２鉄心４４をバイメタル固定板５３に固定した構成を採用している。また、第１鉄心４１は平板状であって上端部のみが第２鉄心４４と当接するように配置してある。第１鉄心４１の上端部の両側面には器体１の内周面に形成された左右方向に長い長溝状の軸受部１ｆに支承される軸４１ｊが突設され、回動自在でかつ軸受部１ｆの範囲内で移動自在になっている。さらに第１鉄心４１の上端部はコイルばねよりなる復帰ばね６２に付勢されて、第２鉄心４４に押し付けられている。
【００６６】
第１鉄心４１の下部にはバイメタル４２の下端部（自由端）が当接可能な押当部４１ｈが設けられており、押当部４１ｈは器体１との間に保持されたコイルばねよりなる復帰ばね６３によってバイメタル４２に押し当てられるように付勢されている。したがって、第１鉄心４１は上端部が第２鉄心４４の主鉄心４４ａの上端部に当接し、当接部位よりも下部では主鉄心４４ａと第１鉄心４１とが離間した形になる。
【００６７】
しかして、接点２ａ，２ｂの閉極状態では、図３１に示すように、ラッチ突起４１ａが作動板３３に係止され、このとき復帰ばね６３のばね力により第１鉄心４１の下部がバイメタル４２に押し当てられ、第１鉄心４１の上部が復帰ばね６２により第２鉄心４４に当接した状態に保たれる。この状態において第１鉄心４１と第２鉄心４４との対向面では上端部のみが当接した状態（下端部は開いた状態）に保たれる。バイメタル４２に過電流が通過すれば、図３２に示すように、バイメタル４２の下端部が右方に変位するように撓み、駆動部としての押当部４１ｈがバイメタル４２に押圧されることによって右方に移動するから、ラッチ突起４１ａは作動板３３を係止している状態を解除し接点２ａ，２ｂを開極させる。このとき、第１鉄心４１の下端部により復帰ばね６３が押圧されて圧縮される。また、バイメタル４２に短絡電流が流れたときには、図３３に示すように、第１鉄心４１が第２鉄心４４に吸引され、ラッチ突起４１ａが作動板３３の係止状態を解除する。他の構成および動作は第１の実施の形態と同様である。
【００６８】
【発明の効果】
請求項１の発明の構成によれば、第１の主鉄心と第２の主鉄心との一部が当接しているので、電磁吸引力が大きくなり、各鉄心の大きさを小さくできる。また、係止部を第１鉄心に一体形成しているので、第１鉄心とは別体の係止部材を必要とせず、部品点数を少なくすることができる。その結果、組立性が向上し、小型化が図れるとともに第１鉄心および第２鉄心間の吸引力を強くすることができる。さらに、過電流が流れるとバイメタルが変位し、このバイメタルの変位によって保持ばねを介して係止部を有する第１鉄心が駆動され、開閉機構と係止部との係止状態を解除して接点を強制開極することができる。加えて、短絡電流等の大電流が流れると、係止部を有する第１鉄心が、第２鉄心に近付く向きに移動し、開閉機構と係止部との係止状態を解除して接点を強制開極させることができる。また、過電流が流れると、バイメタルの変位に伴ってバイメタルとともに第１鉄心および第２鉄心の両方が移動することとなり、もってバイメタルの反りを防止し、過電流引外し特性のばらつきを抑えることができる。
【００７０】
請求項２の発明は、請求項１の発明において、前記開閉機構と前記係止部との係止状態において開閉機構から係止部に作用する力の向きを、前記バイメタルの固定端から自由端に向かう向きとしたものであり、過電流が流れたときに、バイメタルの固定端を支点としてバイメタルの自由端側が開閉機構から係止部に作用する力を弱める向きに移動するので、開閉機構と係止部との係止状態を素早く解除することができる。
【００７１】
請求項３の発明は、請求項１の発明において、前記開閉機構と前記係止部との係止状態において開閉機構から係止部に作用する力の向きを、前記バイメタルの自由端から固定端に向かう向きとしたものであり、過電流が流れたときに、バイメタルの固定端を支点としてバイメタルの自由端側が開閉機構から係止部に作用する力を強める向きに移動するので、開閉機構を係止部に確実に係止させ易くなる。
【００７３】
請求項４の発明の構成によれば、第１の主鉄心と第２の主鉄心との一部が当接しているので、電磁吸引力が大きくなり、各鉄心の大きさを小さくできる。また、係止部を第１鉄心に一体形成しているので、第１鉄心とは別体の係止部材を必要とせず、部品点数を少なくすることができる。その結果、組立性が向上し、小型化が図れるとともに第１鉄心および第２鉄心間の吸引力を強くすることができる。さらに、保持ばねと取付ばねとの機能を一体化した取付保持ばねを用いるから、部品点数を削減して組立性を向上させることができる。
【００８１】
請求項５の発明の構成によれば、第１の主鉄心と第２の主鉄心との一部が当接しているので、電磁吸引力が大きくなり、各鉄心の大きさを小さくできる。また、係止部を第１鉄心に一体形成しているので、第１鉄心とは別体の係止部材を必要とせず、部品点数を少なくすることができる。その結果、組立性が向上し、小型化が図れるとともに第１鉄心および第２鉄心間の吸引力を強くすることができる。さらに、過電流が流れるとバイメタルが変位し、バイメタルで駆動部を駆動して開閉機構と係止部との係止状態を解除して接点を強制開極することができる。加えて、バイメタルおよび係止部を有した第１鉄心を一つの固定電路に連結するから、ブロック化が図れて収納性が向上する。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態を用いた回路遮断器における閉極状態を示す器体を開いた側面図である。
【図２】同上における開極状態を示す器体を開いた側面図である。
【図３】同上における過電流時の開極状態を示す器体を開いた側面図である。
【図４】同上における短絡電流時の開極状態を示す器体を開いた側面図である。
【図５】同上の分解斜視図である。
【図６】同上の組み立てた状態の斜視図である。
【図７】本発明の第２の実施の形態を示す閉極状態の側面図である。
【図８】同上の過電流時の開極状態を示す側面図である。
【図９】同上の短絡電流時の開極状態を示す側面図である。
【図１０】本発明の第３の実施の形態を示す閉極状態の側面図である。
【図１１】同上の過電流時の開極状態を示す側面図である。
【図１２】同上の短絡電流時の開極状態を示す側面図である。
【図１３】同上に用いる取付保持ばねを示す斜視図である。
【図１４】本発明の第４の実施の形態を示す閉極状態の側面図である。
【図１５】同上の過電流時の開極状態を示す側面図である。
【図１６】同上の短絡電流時の開極状態を示す側面図である。
【図１７】本発明の第５の実施の形態を示す閉極状態の側面図である。
【図１８】同上の過電流時の開極状態を示す側面図である。
【図１９】同上の短絡電流時の開極状態を示す側面図である。
【図２０】同上に用いる取付保持ばねを示す斜視図である。
【図２１】本発明の第６の実施の形態を示す閉極状態の側面図である。
【図２２】同上の過電流時の開極状態を示す側面図である。
【図２３】同上の短絡電流時の開極状態を示す側面図である。
【図２４】同上に用いる取付保持ばねを示す斜視図である。
【図２５】本発明の第７の実施の形態を示す閉極状態の側面図である。
【図２６】同上の過電流時の開極状態を示す側面図である。
【図２７】同上の短絡電流時の開極状態を示す側面図である。
【図２８】本発明の第８の実施の形態を示す閉極状態の側面図である。
【図２９】同上の過電流時の開極状態を示す側面図である。
【図３０】同上の短絡電流時の開極状態を示す側面図である。
【図３１】本発明の第９の実施の形態を示す閉極状態の側面図である。
【図３２】同上の過電流時の開極状態を示す側面図である。
【図３３】同上の短絡電流時の開極状態を示す側面図である。
【符号の説明】
１ 器体
１ｃ 位置規制溝
１ｅ 位置規制突起
２ａ，２ｂ 接点
３ 開閉機構
４ 引外し装置
４１ 第１鉄心
４１ａ ラッチ突起
４１ｂ 主鉄心
４１ｈ 押当部
４２ バイメタル
４３ 保持ばね
４４ 第２鉄心
４４ａ 主鉄心
４５ 取付ばね
４８ 取付保持ばね
４９ 取付保持ばね
４６ 復帰ばね
６１ 復帰ばね
６２ 復帰ばね
６３ 復帰ばね[0001]
BACKGROUND OF THE INVENTION
The present invention releases a part of the opening / closing mechanism locked to the locking portion by bringing the separated sides of the first iron core and the second iron core close to each other when an excessive current flows in the energizing circuit, and forcibly opens the contact The present invention relates to a tripping device for a circuit breaker.
[0002]
[Prior art]
In general, a circuit breaker is locked in a state in which a force in the opening direction is stored by a spring or the like with a contact inserted in an energizing circuit between a power source and a load closed, and an overcurrent or a short-circuit current is generated. When such an abnormal current passes through the energization circuit, the tripping device that detects the abnormal current is released and the contact is forcibly opened.
[0003]
As a tripping device, for example, as described in JP-A-6-162910, a bimetal inserted in a current-carrying electric circuit holds an adsorbing piece, and a movable movable piece of magnetic material is arranged facing the adsorbing piece. Some have adopted the above configuration. The latch movable piece is locked to one end of the bimetal. When an overcurrent flows through the energizing circuit and the bimetal is bent by self-heating, the latch movable piece is also bent together with the bimetal to release the latch. Further, when a short-circuit current flows through the energization circuit, the attracting piece attracts the latch movable piece by a magnetic force and releases the latch. In this way, a configuration is employed in which bending due to self-heating of the bimetal is used for overcurrent and magnetic force is used for short-circuit current.
[0004]
[Problems to be solved by the invention]
In the above, since the latching portion for latching the latched portion of the opening / closing mechanism portion is integrally formed on the latch movable piece itself, the latching piece for latching the latched portion of the opening / closing mechanism portion is formed. Assembly is improved without requiring a separate member.
[0005]
However, since the tip of the suction iron piece constituting the tripping device, which is a tripping device when the above-mentioned short-circuit current flows, is separated from the movable latch piece, the installation space of the tripping device itself is increased. In addition, there is a problem that the suction force between the suction iron powder and the latch movable piece becomes weak because of the separation.
[0006]
The present invention has been made in view of the above reasons, and its purpose is to improve circuit assembly, reduce the size of the circuit, and increase the electromagnetic attraction force when releasing the locked state. It is to provide a tripping device for a container.
[0007]
[Means for Solving the Problems]
  According to the first aspect of the present invention, the contact inserted in the energization circuit between the power source and the load and the force in the direction of opening the contact when the contact is closed are stored and the locked state is released. And an open / close mechanism for forcibly opening the contact by the force, used in a circuit breaker provided in the body, when the contact is closedOvercurrent orA tripping device that releases the locking state and forcibly opens the contact when a large current flows through the energizing circuit,A bimetal inserted into the energizing circuit and having one end in the longitudinal direction as a fixed end and the other end as a free end, and an overcurrent flows through the energizing circuit, the free end is displaced in the thickness direction with respect to the fixed end, and the contact is closed A first iron core provided with a locking portion that sometimes locks a part of the opening / closing mechanism to be in a locked state, and a middle portion in the longitudinal direction of the bimetal together with the first main core provided on the first iron core.Arranged to goThe second core with the second main iron core and the first iron core is displaced together with the bimetal when the free end of the bimetal is displaced with respect to the fixed end due to overcurrent.Locking state between locking part and opening / closing mechanismThe first iron core with the free end of the bimetal so that theHolding spring consisting of connecting leaf springsAnd at one end along the longitudinal direction of the bimetal on the opposing surface of the first main iron core and the second main iron core so that they are in contact with each other and are separated from each other at the other end.Connect the 1st iron core and the 2nd iron coreBoardMounting spring consisting of a springWhen a large current flows through the energization circuit, a suction force acts between the first iron core and the second iron core, and a separated part between the first main iron core and the second main iron core is adsorbed. It is set as the structure by which the latching state of an opening-and-closing mechanism and a latching | locking part is cancelled | released, and a part of 2nd iron core is controlled so that the movement of the 2nd iron core toward the 1st iron core may be controlled.The movement restricting portion that abuts is provided on the container.
  According to this configuration,FirstMain iron coreAnd secondMain iron coreAnd part ofSince they are in contact with each other, the electromagnetic attractive force is increased, and the size of each iron core can be reduced. Also, the locking part is made of ferrous ironIn mindBecause it is integrally formed,1st iron coreA separate locking member is not required and the number of parts can be reduced. As a result, the assemblability is improved, the size can be reduced, and the suction force between the first iron core and the second iron core can be increased. Furthermore, when an overcurrent flows, the bimetal is displaced. Due to the displacement of the bimetal, ferrous iron having a locking portion via a holding spring.HeartDriven and open / close mechanismAnd the locking state of the locking partIt can be released and the contacts can be forcibly opened. In addition, when a large current such as a short circuit current flowsHas a locking partFerrous ironHeart2 ironTo approach the heartMove and open / close mechanismAnd the locking state of the locking partThe contact can be forcibly opened by releasing. In addition, when overcurrent flows, the displacement of the bimetalAccompanied byBoth the first iron core and the second iron core move together with the bimetal, thereby preventing the bimetal from warping and suppressing variations in overcurrent tripping characteristics.
[0009]
  Claim 2The invention ofClaim 1In the invention ofOpenClosingStructure and the person in chargeStopThe direction of the force acting on the locking portion from the opening / closing mechanism in the locked state is set to the direction from the fixed end of the bimetal toward the free end.Is. According to this configuration, when an overcurrent flows, the bimetal free end side opens and closes with the bimetal free end as a fulcrum.Acts on the locking part fromWeakenMove in directionSoThe locking state between the opening / closing mechanism and the locking partIt can be released quickly.
[0010]
  Claim 3The invention ofClaim 1In the invention ofOpenClosingStructure and the person in chargeStopThe direction of the force acting on the locking portion from the opening / closing mechanism in the locked state is set to the direction from the free end of the bimetal toward the fixed end.Is. According to this configuration, when an overcurrent flows, the bimetal free end side opens and closes with the bimetal free end as a fulcrum.Acts on the locking part fromStrengthen powerMove in directionOpening and closing machineStructureMake sure to lock it to the stop.It becomes easy.
[0012]
  The invention according to claim 4 stores the contact inserted in the energizing circuit between the power source and the load and the force for opening the contact when the contact is closed, and sets the locked state to release the locked state. And an open / close mechanism for forcibly opening the contact by the force, used in a circuit breaker provided in the body, when the contact is closedOvercurrent orA tripping device that releases the locking state and forcibly opens the contact when a large current flows through the energizing circuit,A bimetal inserted into the energizing circuit and having one end in the longitudinal direction as a fixed end and the other end as a free end, and an overcurrent flows through the energizing circuit, the free end is displaced in the thickness direction with respect to the fixed end, and the contact is closed A first iron core provided with a locking portion that sometimes locks a part of the opening / closing mechanism to be in a locked state, and a middle portion in the longitudinal direction of the bimetal together with the first main core provided on the first iron core.Arranged to goThe second core with the second main iron core and the first iron core is displaced together with the bimetal when the free end of the bimetal is displaced with respect to the fixed end due to overcurrent.Locking state between locking part and opening / closing mechanismThe first iron core with the free end of the bimetal so that theLinkingAnd at one end along the longitudinal direction of the bimetal on the opposing surfaces of the first main iron core and the second main iron core so as to contact each other and to be separated from each other at the other end.Connecting the first iron core and the second iron coreTieMounting and holding springWhen a large current flows through the energization circuit, a suction force acts between the first iron core and the second iron core, and a separated part between the first main iron core and the second main iron core is adsorbed. It is set as the structure by which the latching state of an opening-and-closing mechanism and a latching | locking part is cancelled | released, and a part of 2nd iron core is controlled so that the movement of the 2nd iron core toward the 1st iron core may be controlled.The movement restricting portion that abuts is provided on the container.
  According to this configuration,FirstMain iron coreAnd secondMain iron coreAnd part ofSince they are in contact with each other, the electromagnetic attractive force is increased, and the size of each iron core can be reduced. Also, the locking part is made of ferrous ironIn mindBecause it is integrally formed,1st iron coreA separate locking member is not required and the number of parts can be reduced. As a result, the assemblability is improved, the size can be reduced, and the suction force between the first iron core and the second iron core can be increased. Furthermore, since the attachment holding spring in which the functions of the holding spring and the attachment spring are integrated is used, the number of parts can be reduced and the assemblability can be improved.
[0020]
  The invention according to claim 5 stores the contact inserted in the energizing circuit between the power source and the load and the force in the direction of opening the contact when the contact is closed, and the locked state is released. And an open / close mechanism for forcibly opening the contact by the force, used in a circuit breaker provided in the body, when the contact is closedOvercurrent orA tripping device that releases the locking state and forcibly opens the contact when a large current flows through the energizing circuit,A bimetal inserted into the energizing circuit and having one end in the longitudinal direction as a fixed end and the other end as a free end, and an overcurrent flows through the energizing circuit, the free end is displaced in the thickness direction with respect to the fixed end, and the contact is closed A first iron core provided with a locking portion that sometimes locks a part of the opening / closing mechanism to be in a locked state, and a middle portion in the longitudinal direction of the bimetal together with the first main core provided on the first iron core.Arranged to goA second iron core comprising a second main iron core,Ferrous ironHeartExtendedWhen the free end of the bimetal is displaced with respect to the fixed end due to overcurrent, the first iron core is displaced together with the bimetal by being pressed against the free end of the bimetal, and the locked state between the locking portion and the opening / closing mechanism is released. The driving part to be driven and the first main iron core and the second main iron core facing each other at one end along the longitudinal direction of the bimetal so as to be in contact with each other and separated from each other at the other endLeaf spring connecting the first iron core and the second iron coreAnd a bimetal fixing plate that is secured to the mounting spring and the bimetal to form an energizing circuit with the bimetal. When a large current flows through the energizing circuit, an attractive force is generated between the first iron core and the second iron core. It acts as a structure in which the spaced apart part between the first main iron core and the second main iron core is attracted and the locking state between the opening and closing mechanism and the locking part is released, and the first iron core of the second iron core is released. Abuts against a part of the second iron core so as to restrict movement in the direction of headingThe movement restricting portion is provided in the container.
  According to this configuration,FirstMain iron coreAnd secondMain iron coreAnd part ofSince they are in contact with each other, the electromagnetic attractive force is increased, and the size of each iron core can be reduced. Also, the locking part is made of ferrous ironIn mindBecause it is integrally formed,1st iron coreA separate locking member is not required and the number of parts can be reduced. As a result, the assemblability is improved, the size can be reduced, and the suction force between the first iron core and the second iron core can be increased. Furthermore, when an overcurrent flows, the bimetal displaces, and the drive unit is driven by the bimetal to open and closeAnd the locking state of the locking partIt can be released and the contacts can be forcibly opened. In addition, ferrous iron with bimetal and locking partOne heartConnect to fixed circuitBecauseBlocking can be achieved and storage performance is improved.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
As shown in FIG. 1, the circuit breaker of the present embodiment has a rectangular parallelepiped container body 1 that is a synthetic resin molded product, and the container body 1 has a width direction (surface of FIG. 1). Abnormal current has passed through the two contact points 2a and 2b arranged in parallel to each other, the switching mechanism 3 that collectively opens and closes the contact points 2a and 2b, and the energizing circuit in which the contact points 2a and 2b are inserted. A tripping device 4 for operating the opening / closing mechanism 3 to forcibly open the contacts 2a, 2b is sometimes stored. The contacts 2a and 2b are provided with two fixed contacts 21a and 21b fixed to the container 1, and movable contacts 22a and 22b that are separated from and in contact with the fixed contacts 21a and 21b. That is, in this embodiment, a two-pole circuit breaker is shown.
[0022]
The fixed contact 21a is fixed to a contact holding piece 23a extended from a U-shaped terminal plate 23 opened to the front side in the figure. The contact holding piece 23a is formed in an L-shape that extends downward from the side edge of the lower piece of the terminal plate 23 and then extends away from the terminal plate 23 along the lower wall of the vessel 1. The fixed contact 21a is exposed on the upper surface of the portion extending along the lower surface of the. Further, the terminal plate 23 has a lower wall of the container body 1 such that the upper and lower pieces increase the distance from the lower wall of the container body 1 closer to the side surface (left side surface in FIG. 1) of the container body 1. It is arrange | positioned so that it may incline with respect to. A locking spring 24 is disposed between the upper piece and the lower piece of the terminal plate 23. The locking spring 24 is formed by bending one end of the belt-like leaf spring in the longitudinal direction into a J shape to form a locking piece 24a and the other end in an S shape to form a contact piece 24b. The locking piece 24a and the contact piece 24b are arranged so as to face the upper piece of the terminal board 23. Therefore, the electric wire inserted into the container body 1 through the wire insertion hole 11 formed in the side wall of the container body 1 is inserted between the locking piece 24a and the contact piece 24b and the upper piece of the terminal plate 23 from the side of the locking piece 24a. Then, the electric wire is sandwiched between the upper piece of the terminal plate 23 by the spring force of the locking piece 24a and the contact piece 24b, the electric wire is electrically connected to the terminal plate 23, and the locking piece 24a is further connected to the electric wire. And the wire is prevented from being pulled out (ie, locked). This type of terminal structure is known as a quick-connect terminal structure. The terminal plate 23 is formed with a protrusion 23c for positioning the locking spring 24.
[0023]
In order to release the locked state of the electric wire held by the terminal plate 23 and the locking spring 24, a release handle 25 is provided through which the operation portion 25a is exposed from the exposure window 12 provided on the upper surface of the container body 1. In the release handle 25, shaft support portions 25b provided on both side surfaces of the lower portion are supported by the body 1 so that the operation portion 25a can move within the range of the exposure window 12. A release protrusion 25c that can come into contact with the locking piece 24a protrudes from the lower part of the release handle 25, and the release handle 25 is rotated counterclockwise around the shaft support 25b by manually operating the operation portion 25a. Then, the release protrusion 25c pushes the tip of the locking piece 24a downward, pulls the locking piece 24a away from the upper piece of the terminal plate 23, and releases the locked state of the electric wire. In this state, the electric wire can be pulled out. Here, in the locking piece 24a, the part holding the electric wire and the part where the release protrusion 25c abuts are shifted.
[0024]
On the other hand, the fixed contact 21b is fixed to a contact holding piece 23b extending from a U-shaped terminal plate disposed behind the terminal plate 23. The contact holding piece 23b is formed in an L-shape that extends upward from the side edge of the lower piece of the terminal plate and then extends away from the terminal plate, and extends along the partition wall portion 13 provided on the inner surface of the container 1. Placed in. The fixed contact 21b protrudes from the upper surface of the tip of the contact holding piece 23b. Like the terminal plate 23, this terminal plate is disposed so as to be inclined with respect to the lower wall of the container 1, and holds a locking spring (not shown) having the same configuration as the locking spring 24. Further, a release handle having the same configuration as the release handle 25 is provided so as to correspond to the locking spring. That is, the release handle 25 is provided independently for each locking spring 24.
[0025]
As is clear from the configuration described above, the fixed contact 21a is disposed below the fixed contact 21b. The movable contacts 22a and 22b corresponding to the fixed contacts 21a and 21b are respectively held at the ends of the movable contacts 26a and 26b connected to the switching mechanism 3, and the movable contacts 22a and 22b are connected to the movable contacts 26a and 26b. The provided end is driven by the opening / closing mechanism 3 to move up and down. Here, the movable contact 26a corresponding to the lower fixed contact 21a is arranged so as not to interfere with the upper fixed contact 21b at the upper end position of the movement range. Although not shown, a partition member made of an insulating material is disposed between the two contacts 2a and 2b, and the insulation distance between the two contacts 2a and 2b is maintained.
[0026]
The opening / closing mechanism 3 has a handle 31 having an operation part 31a that rises and falls through a window hole 14 that opens on the upper surface of the container 1, and a rotation part 31b is integrally formed at one end of the operation part 31a. 31 b includes a handle shaft 31 c that is supported by the container 1 inside the window hole 14. Therefore, the handle 31 can be raised and lowered between a position where the operation portion 31 a is substantially flush with the opening surface of the window hole 14 and a position where the operation portion 31 a protrudes from the window hole 14. An arcuate guide surface 14a is formed on the inner peripheral surface of the window hole 14 in the container 1 so that the guide projection 31d provided on the rotating portion 31b of the handle 31 is in sliding contact with the guide projection 31d when the handle 31 is raised and lowered. The handle 31 undulates smoothly by sliding on the surface. Further, a stop 14b protrudes from the window hole 14, and the position of the handle 31 is regulated by the operation portion 31a coming into contact with the stop 14b when the handle 31 is tilted.
[0027]
An upper end portion of a U-shaped link 32 is pivotally attached to the rotating portion 31 b of the handle 31, and an operation plate 33 is pivotally attached to the lower end portion of the link 32. The opening / closing mechanism 3 includes a synthetic resin molded product holding body 34 that holds the movable contacts 26a and 26b. A shaft portion 34c projects from the side surface of the upper end portion of the holding body 34, and the shaft portion 34c is a container body. 1 is supported rotatably. An opening spring 35 made of a coil spring is held between the lower end of the holding body 34 and the bottom of the container 1, and the holding body 34 is urged clockwise in FIG. 1 by the spring force of the opening spring 35. ing. Here, the movable contact 26b is formed in a strip shape by a conductive metal plate having a composition, and the middle portion in the longitudinal direction is inserted into a cut groove 34b provided on one side surface (the back surface in FIG. 1) of the holding body 34, A contact pressure spring 36 formed of a coil spring is sandwiched between the lower surface of the movable contact 26 b and the holding body 34. Further, an intermediate portion of the movable contact 26a formed of a thin conductive metal plate is inserted into a cut groove 34a provided on the other side surface (front surface in FIG. 1) of the holding body 34. The handle 31, the link 32, the operation plate 33, the holding body 34, the opening spring 35, and the contact pressure spring 36 constitute the opening / closing mechanism 3, and the opening / closing mechanism 3 operates in cooperation with a tripping device 4 described later. By doing so, the contacts 2a and 2b are opened and closed.
[0028]
By the way, the operation plate 33 has a main piece 33a formed in a strip shape, and includes bearing pieces 33b suspended from both sides of a middle portion of the main piece 33a in the longitudinal direction. A tip of the bearing piece 33b is formed in an arc shape, and can be brought into contact with a protrusion 34d that protrudes closer to the contacts 2a and 2b than the shaft 34c on the upper surface of the holding body 34. One end of the main piece 33a on the contact 2a, 2b side can be in contact with the tip of the projection 34d, and the other end of the main piece 33a is a latch projection 41a (as a locking portion provided in the tripping device 4). (To be described later).
[0029]
A terminal block 50 that can be connected to a conductive bar (not shown) disposed in the distribution board is provided on the right side of the container 1. The terminal block 50 has insertion grooves 51a to 51c at three upper and lower positions, and blade receiving springs 52a and 52c are arranged corresponding to the upper and lower two insertion grooves 51a and 51c of the insertion grooves 51a to 51c. . Each blade receiving spring 52a, 52b includes a pair of upper and lower spring pieces, and is electrically connected to the conductive bar by sandwiching the conductive bar between the two spring pieces. One end of a movable contact 26a is fixed to the upper blade receiving spring 52a. The movable contact 26a extends to the lower part of the container 1, and then extends along the lower wall of the container 1. An inclined piece 26c that is inclined so as to increase the distance from the lower wall of the body 1 toward the portion where the movable contact 22a is fixed is formed. The movable contact 26a includes a contact holding piece 26d extended from the tip of the inclined piece 26c, and an intermediate portion of the contact holding piece 26d is inserted into a cut groove 34a provided in the holding body 34. On the other hand, a bimetal fixing plate 53 extended upward is fixed to the lower blade receiving spring 52b as a fixed electric circuit. The upper end portion of the bimetal fixing plate 53 is held by a holding portion 1a provided on the inner peripheral surface of the container 1, and the bimetal fixing plate 53 has a U-shape that is open to the front side in FIG. The fixed piece 53a is provided, and the upper end of the bimetal 42 constituting the tripping device 4 is fixed to one end of the fixed piece 53a. That is, the upper end portion of the bimetal 42 becomes a fixed end of the bimetal, and the lower end portion becomes a free end of the bimetal 42.
[0030]
As shown in FIGS. 5 and 6, holding springs 43 made of leaf springs are fixed to both side edges of the lower end portion of the bimetal 42. The holding spring 43 is provided with a fixing piece 43a that abuts against the bimetal 42 at the lower end, and is fixed by caulking to the bimetal 42 at both side edges of the fixing piece 43a so as to engage with notch grooves 42a provided on both lower side edges of the bimetal 42. A caulking piece 43b is provided. Further, a bending piece 43c is extended from the upper edge of the fixing piece 43a in a direction away from the bimetal 42, and an attachment piece 43d is extended upward from the tip of the bending piece 43c. The mounting piece 43d is superimposed on the lower part of the first iron core 41 made of a magnetic material such as ferrite. A caulking piece 43e is provided on both side edges of the attachment piece 43d, and the caulking piece 43e is caulked and fixed to the first iron core 41.
[0031]
The first iron core 41 includes a main iron core 41b formed in a U shape or a U shape surrounding one surface and both side surfaces in the thickness direction in the middle portion of the bimetal 42, and a fixed piece 41c projects from the lower end of the main iron core 41b. A position restricting piece 41d protrudes from the upper end of the main iron core 41b. That is, the main iron core 41 b has a pair of side pieces arranged on both sides in the width direction of the bimetal 42 and is formed in a shape in which both side pieces are connected on one surface side in the thickness direction of the bimetal 42. Fixing grooves 41e are formed on both side edges of the fixing piece 41c, and the holding spring 43 is fixed to the first iron core 41 by engaging and fixing the caulking pieces 43e to the fixing groove 41e. A latch protrusion 41a is projected on the outer surface of the first iron core 41, and one end of the operation plate 33 of the opening / closing mechanism 3 described above can be locked to the latch protrusion 41a.
[0032]
Incidentally, since the main iron core 41b of the first iron core 41 is formed in a U-shape or U-shape as described above, the right end surface (the left end surface in FIG. 5) of the main iron core 41b in FIG. 41f is formed. On the other hand, a second iron core 44 made of a magnetic material such as ferrite is disposed facing the magnetic pole surface 41f, and the second iron core 44 is coupled to the first iron core 41 via an attachment spring 45 made of a leaf spring. Yes. The second iron core 44 has a dowel 44b projecting from the surface of the main iron core 44a formed in a rectangular shape facing the first iron core 41, and a position restricting projection 44c projecting from the upper surface of the main iron core 44a. On the other hand, the mounting spring 45 includes a fixing piece 45b having a fixing hole 45a into which the dowel 44b is inserted and fixed, and a spring piece 45c that is bent away from the second iron core 44 is formed at the lower end of the fixing piece 45b. A receiving piece 45d for receiving the lower surface of the main iron core 41b of the first iron core 41 is formed at the lower end edge of the spring piece 45c. Holding pieces 45e that can come into contact with the outer surface of the main iron core 41b protrude upward on both side edges of the receiving piece 45d, and at the end edges of the holding pieces 45e that are far from the fixed pieces 45b, Hooking pieces 45f that respectively engage with the two hooking grooves 41g formed on the outer side surface are projected. That is, the first iron core 41 and the second iron core 44 are connected via the attachment spring 45 when the attachment spring 45 fixed to the second iron core 44 engages with the first iron core 41.
[0033]
As described above, the first iron core 41 is coupled to the bimetal 42 via the holding spring 43, and the second iron core 44 is coupled to the first iron core 41 via the mounting spring 45. 42, the holding spring 43, the second iron core 44, and the mounting spring 45 are integrated, and the trip device 4 can be handled as one member. Here, the bimetal 42 is inserted into a space surrounded by the main iron core 41 b of the first iron core 41 and the main iron core 44 a of the second iron core 44, and the magnetic flux formed around the bimetal 42 when the bimetal 42 is energized. Pass through the first iron core 41 and the second iron core 44.
[0034]
By the way, the magnetic pole surface 41f of the first iron core 41 faces the second iron core 44, and when no current flows through the bimetal 42, the magnetic pole surface 41f and the second iron core 44 abut only at the lower end portion, and the upper end portion. Are arranged away from each other. Further, in a state where the trip device 4 is assembled to the container body 1, the position restricting piece 41 d of the first iron core 41 abuts on the position restricting protrusion 1 b protruding from the inner peripheral surface of the container body 1, and the second iron core 44 The position restricting projection 44c is inserted into a position restricting groove 1c as a movement restricting portion provided on the inner peripheral surface of the container 1.
[0035]
The upper end portion of the bimetal 42 provided in the tripping device 4 is connected to the blade receiving spring 52c via the bimetal fixing plate 53 as described above. The lower end of the bimetal 42 is connected to one end of the movable contact 26 b via a braided wire 47. Therefore, between the blade receiving spring 52c and a terminal plate (not shown) (terminal plate on the back side of the terminal plate 23), the bimetal fixed plate 53-bimetal 42-braided wire 47-movable contact 26b-movable contact 22b-fixed. A current-carrying electric path of the path of the contact 21b-contact holding piece 23b is formed. Furthermore, between the blade receiving spring 52a and the terminal plate 23, an energizing electric path of the movable contact 26a-movable contact 22a-fixed contact 21a-contact holding piece 23a is formed.
[0036]
Next, the operation of this embodiment will be described. FIG. 1 shows a closed state of the contacts 2a and 2b. In this state, the handle 31 is tilted so that the operation portion 31a contacts the stop 14b, and the upper end of the link 32 is located on the left side of the handle shaft 31c. Yes. The left end portion of the operating plate 33 connected to the lower end of the link 32 abuts on a protrusion 34d provided on the holding body 34, and rotates clockwise around the coupling portion with the link 32 by the spring force of the opening spring 35. Receive power. Here, since the right end portion of the operating plate 33 is locked on the latch protrusion 41 a provided on the first iron core 41, the operating plate 33 does not rotate, and as a result, the holding body 34 moves the opening spring 35. By compressing, the movable contacts 26a and 26b are pressed downward, and the movable contacts 22a and 22b come into contact with the fixed contacts 21a and 21b. At this time, a force that pushes up the operating plate 33 acts by the spring force of the opening spring 35. However, since the upper end of the link 32 is located on the left side of the handle shaft 31c, a clockwise rotational force acts on the handle 31. Then, the handle 31 is kept in the tilted position. Further, the upper wall of the cut groove 34a presses the contact holding piece 26d of the movable contact 26a from above, so that the contact pressure of the movable contact 22a against the fixed contact 21a can be obtained. The contact pressure of the movable contact 22b with respect to the fixed contact 21b is obtained by the spring force of the contact pressure spring 36 acting in a state in which a part of the upper wall of the cut groove 34b is in contact.
[0037]
On the other hand, when the handle 31 is raised from the closed state shown in FIG. 1 as shown in FIG. 2, the upper end of the link 32 is pulled up so as to be positioned on the right side of the handle shaft 31c, and the operating plate 33 is pulled up. Does not come into contact with the operating plate 33, and the holding body 34 rotates in the clockwise direction by the spring force of the opening spring 35. As a result, the movable contacts 26a and 26b held by the holding body 34 are pulled up, and the movable contacts 22a and 22b are opened away from the fixed contacts 21a and 21b. That is, when the operating portion 31a of the handle 31 is raised, the contact is opened. Here, in the open state, the rotation position of the holding body 34 in the clockwise direction is restricted by the lower part of the holding body 34 coming into contact with the partition wall portion 13.
[0038]
By the way, when an overcurrent flows through the energizing circuit including the bimetal 42 in the closed state of FIG. 1, the bimetal 42 bends so that the lower end portion is displaced to the right side of the drawing as shown in FIGS. 3 and 8. On the other hand, the lower end portion of the first iron core 41 connected via the holding spring 43 moves to the right with respect to the upper end portion, so that the latching state between the latch protrusion 41a and the operating plate 33 is released. As a result, the actuating plate 33 can be rotated around the lower end of the link 32, and the holding body 34 is rotated clockwise by the spring force of the opening spring 35 so that the movable contacts 22a and 22b are opened from the fixed contacts 21a and 21b. It will be extreme. At this time, the actuating plate 33 is freely rotated around the lower end of the link 32 so that the spring force of the opening spring 35 is not transmitted to the handle 31, and the operation portion 31a of the handle 31 is kept in a collapsed state. That is, it becomes a so-called trip-free state. In this state, the holding body 34 abuts against the partition wall portion 13 to restrict the rotational position.
[0039]
When a large current such as a short-circuit current flows through the energizing circuit including the bimetal 42, an attractive force acts between the first iron core 41 and the second iron core 44 due to a magnetic field generated around the bimetal 42. Since the lower end portion of the magnetic pole surface 41 f of the first iron core 41 is in contact with the second iron core 44, an attractive force is generated between the upper portion of the first iron core 41 and the second iron core 44 as shown in FIGS. 4 and 9. Acts and the upper part of the first iron core 41 moves rapidly to the right in the figure. As a result, the latch protrusion 41a of the first iron core 41 is detached from the operating plate 33, and the movable contacts 22a and 22b are opened from the fixed contacts 21a and 21b in the same manner as when an overcurrent flows. Also in this case, the trip is free.
[0040]
The operation of the trip device 4 will be described in more detail. In the closed state of FIG. 1, the operating plate 33 is locked to the latch protrusion 41a of the first iron core 41, and the first iron core 41 is tilted to the left side in the drawing by the holding spring 43, and the position restricting piece 41d is moved. It is made to contact | abut to the position control protrusion 1b of a container. Only the lower end of the magnetic pole surface 41 f of the first iron core 41 is in contact with the second iron core 44, and the second iron core 44 is urged leftward by the spring piece 45 c of the attachment spring 45. In this state, the position restricting projection 44 c provided on the upper part of the second iron core 44 abuts on the left peripheral wall of the position restricting groove 1 c of the container 1, and the lower part of the second iron core 44 abuts on the first iron core 41. That is, the first iron core 41 is coupled to the free end of the bimetal 42 by the holding spring 43 and is urged in a direction to be separated from the bimetal 42 by the spring force of the holding spring 43. The positional relationship with the bimetal 42 is determined by contacting the position restricting protrusion 1b. Further, the positional relationship between the first iron core 41 and the second iron core 44 is determined by a spring piece 45 c provided on the attachment spring 45.
[0041]
Here, when an overcurrent passes through the bimetal 42, as shown in FIG. 2, the bimetal 42 bends so that the lower end of the bimetal 42 is displaced to the right side, and the latched state between the latch protrusion 41a and the operating plate 33 is released. To do. Here, if the second iron core 44 is fixed, the movement range of the first iron core 41 is restricted, the bimetal 42 is difficult to bend, and the bimetal 42 is bent in an S shape. A force in a direction different from the original bending direction acts on the bimetal 42. When such a force acts on the bimetal 42, the bimetal 42 may be plastically deformed, and the current value for releasing the latched state of the latch protrusion 41a from the operating plate 33 becomes large, and the overcurrent to be operated is increased. Will not work. In contrast, in the configuration of the present embodiment, the second iron core 44 can be moved in the bending direction of the bimetal 42, so that the lower end portion of the bimetal 42 is bent to the right side and the lower end portion of the first iron core 41 is moved to the right side. Then, since the second iron core 44 is pushed by the first iron core 41 and moves to the right side, the bimetal 42 is deformed so that the latch projection 41a increases the current value for releasing the locking state with the operating plate 33. It will disappear.
[0042]
When the short-circuit current passes through the bimetal 42, the first metal core 41 is attracted to the second iron core 44 without being bent almost as shown in FIG. 3, so that the latch protrusion 41 a and the operation plate 33 are locked. The state is released. In other words, when the short-circuit current passes through the bimetal 42, the bimetal 42 becomes high temperature due to self-heating. Therefore, if the bimetal 42 is bent in this state, the bimetal 42 is easily plastically deformed. By abutting against the second iron core 44, the magnetic resistance between the first iron core 41 and the second iron core 44 is relatively small, and the magnetic force generated in the first iron core 41 is made to act efficiently on the second iron core 44. Thus, before the bimetal 42 is deformed, the first iron core 41 is instantaneously attracted to the second iron core 44, and the latched state between the latch protrusion 41a and the operating plate 33 can be released.
[0043]
(Second Embodiment)
This embodiment uses the tripping device 4 having the configuration shown in FIGS. 7 to 9, omitting the mounting spring 45 in the first embodiment, and a torsion coil spring 46 held by the vessel 1. The second iron core 44 is abutted against the second iron core 44, and the second iron core 44 is urged to abut against the first iron core 41.
[0044]
In the closed state of the contacts 2a and 2b, as shown in FIG. 7, the latch projection 41a is locked to the operating plate 33. At this time, the spring force of the torsion coil spring 46 is passed through the second iron core 44. By being transmitted to the first iron core 41, the position restricting piece 41 d of the first iron core 41 comes into contact with the position restricting protrusion 1 b provided on the container body 1, and the main iron core 41 b of the first iron core 41 and the main iron core of the second iron core 44. 44a is kept in a state in which only the lower end portion is in contact therewith. Further, since the position restricting projection 44c of the second iron core 44 is inserted into the position restricting groove 1c provided in the container body 1, the movement of the second iron core 44 is also restricted by coming into contact with the left peripheral wall of the position restricting groove 1c. The If an overcurrent passes through the bimetal 42, the lower end of the bimetal 42 bends so as to be displaced to the right as shown in FIG. 8, and the lower portion of the first iron core 41 moves to the right together with the holding spring 43. The protrusion 41a releases the state where the operation plate 33 is locked, and opens the contacts 2a and 2b. At this time, when the first iron core 41 moves to the right, the second iron core 44 is pushed to the right, and unnatural deformation of the bimetal 42 is prevented. When a short-circuit current flows through the bimetal 42, as shown in FIG. 9, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0045]
(Third embodiment)
This embodiment uses the tripping device 4 having the configuration shown in FIGS. 10 to 12, and the first embodiment differs from the main iron core 41 b of the first iron core 41 and the main iron core 44 a of the second iron core 44. The shape is changed. That is, in the first iron core 41, the main iron core 41b has a flat plate shape, and in the second iron core 44, the main iron core 44a has a U-shaped cross section or a U-shaped cross section. Further, the mounting and holding spring 48 having the structure shown in FIG. 13 having the functions of the holding spring 43 and the mounting spring 45 described in the first embodiment is used.
[0046]
As shown in FIG. 13, the mounting and holding spring 48 includes a fixing piece 48a that overlaps the lower end (free end) of the bimetal 42, and engages with notches 42a provided in the bimetal 42 on both side edges of the fixing piece 48a. A caulking piece 48b that is caulked and fixed is provided. From the fixed piece 48a, a spring piece 48c having a portion inclined so as to increase the distance from the bimetal 42 is extended upward, and bent from both sides of the upper end edge of the spring piece 48c in a direction away from the bimetal 42. A pair of receiving pieces 48d that receive the lower surface of the main piece 41b of the first iron core 41 are extended. A pressing piece 48e extending upward is extended at an intermediate portion of the upper end edge of the spring piece 48c. A pair of holding pieces 48f for holding the main iron core 41b of the first iron core 41 between the holding piece 48d and the holding piece 48e are extended upward at the front end edge of the receiving piece 48d, and from the outer edge of the upper end portion of each holding piece 48f. The pair of holding pieces 48g that contact the outer surface of the main iron core 44a of the second iron core 44 are extended. Further, a caulking piece 48h is provided at the front end of each holding piece 48g to be engaged and fixed to a fixing groove 44e provided on the outer surface of the main iron core 44a of the second iron core 44.
[0047]
Therefore, the first iron core 41, the second iron core 44, and the bimetal 42 are integrally coupled via the attachment holding spring 48. Further, by transmitting the spring force of the spring piece 48c from the holding piece 48e to the first iron core 41, a spring force is given to tilt the upper end portion of the first iron core 41 to the left in the figure, and the spring piece 48c The two iron cores 44 also apply a spring force in the direction of tilting to the left in the drawing (that is, the direction approaching the first iron core 41). However, the position restricting projection 44c of the second iron core 44 is inserted into the position restricting groove 1c of the container 1, and the movement of the second iron core 44 is restricted by contacting the left peripheral wall of the position restricting groove 1c.
[0048]
In the closed state of the contacts 2a and 2b, as shown in FIG. 10, the latch protrusion 41a is locked to the operating plate 33, and at this time, the spring force of the spring piece 48c is transmitted to the first iron core 41. As a result, the position restricting piece 41d of the first iron core 41 abuts on the position restricting projection 1b provided on the body 1, and the main iron core 41b of the first iron core 41 and the main iron core 44a of the second iron core 44 abut only at the lower end. It is kept in a letting state. If an overcurrent passes through the bimetal 42, as shown in FIG. 11, the lower end portion of the bimetal 42 bends so as to be displaced to the right, and the lower portion of the first iron core 41 is pushed by the holding piece 48f and moves to the right. Therefore, the latch protrusion 41a releases the state where the operation plate 33 is locked and opens the contacts 2a and 2b. At this time, when the first iron core 41 moves to the right, the second iron core 44 is pushed to the right, and unnatural deformation of the bimetal 42 is prevented. When a short-circuit current flows through the bimetal 42, as shown in FIG. 12, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0049]
(Fourth embodiment)
In the embodiment described above, the upper end portion of the bimetal 42 is a fixed end. However, in this embodiment, as shown in FIGS. 14 to 16, the lower end portion of the bimetal is extended from the blade receiving spring 52c to the bimetal fixing plate 53. The configuration is fixed.
[0050]
The tripping device 4 of the present embodiment uses a second iron core 44 having a main iron core 44a having a U-shaped cross section or a U-shaped cross section. The first iron core 41 is a flat plate, and the first iron core 41 and the first iron core 41 The upper end of the surface facing the two iron cores 44 is abutted and the lower end is spaced apart. In this state, the first iron core 41 and the second iron core 44 are connected by an attachment holding spring 48 made of a leaf spring. Here, the shape of the attachment holding spring 48 is substantially the same as that used in the third embodiment.
[0051]
That is, the attachment holding spring 48 includes a fixing piece 48a that overlaps the upper end (free end) of the bimetal 42, and is fixed by caulking to both side edges of the fixing piece 48a by engaging with notch grooves 42a provided in the bimetal 42. A caulking piece 48b is provided. An L-shaped spring piece 48c extends from the fixed piece 48a, and a receiving piece 48d extending along the upper surface of the main piece 41b of the first iron core 41 is extended to the lower end edge of the spring piece 48c. A pressing piece 48e extends downward from the leading edge of the receiving piece 48d. A holding piece 48f that holds the main iron core 41b of the first iron core 41 is extended downward from the receiving piece 48d. The main piece of the second iron core 44 is further extended from the lower end of the holding piece 48f. A pair of holding pieces 48g that abut on the outer surface of the iron core 44a are extended. Further, a caulking piece 48h is provided at the front end of each holding piece 48g to be engaged and fixed to a fixing groove 44e provided on the outer surface of the main iron core 44a of the second iron core 44.
[0052]
Therefore, the first iron core 41, the second iron core 44, and the bimetal 42 are integrally coupled via the attachment holding spring 48. Further, by transmitting the spring force of the spring piece 48c from the holding piece 48e to the first iron core 41, a spring force is applied in such a direction that the lower end portion of the first iron core 41 is tilted to the left in the figure. The lower end portion of the two iron cores 44 also applies a spring force in the direction of tilting to the left in the drawing (that is, the direction approaching the first iron core 41). A position restricting projection 44c protrudes from the lower surface of the second iron core 44. The position restricting projection 44c abuts on a position restricting projection 1e provided on the container 1 as a position restricting portion, thereby lowering the lower end of the second iron core 44. Movement to the left is restricted.
[0053]
In the closed state of the contacts 2a and 2b, as shown in FIG. 14, the latch protrusion 41a is locked to the operating plate 33, and at this time, the spring force of the spring piece 48c is transmitted to the first iron core 41. As a result, the position restricting piece 41d of the first iron core 41 abuts on the position restricting projection 1b provided on the body 1, and the main iron core 41b of the first iron core 41 and the main iron core 44a of the second iron core 44 abut only at the upper end. It is kept in a letting state. If an overcurrent passes through the bimetal 42, the upper end portion of the bimetal 42 bends to the right as shown in FIG. 15, and the upper portion of the first iron core 41 is pushed by the holding piece 48f and moves to the right. Therefore, the latch protrusion 41a releases the state where the operation plate 33 is locked and opens the contacts 2a and 2b. At this time, when the first iron core 41 moves to the right, the second iron core 44 is pushed to the right, and unnatural deformation of the bimetal 42 is prevented. When a short-circuit current flows through the bimetal 42, as shown in FIG. 16, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0054]
(Fifth embodiment)
The tripping device 4 used in the present embodiment uses an attachment holding spring 49 having both functions of the holding spring spring 43 and the attachment spring 45 in the first embodiment, as in the third embodiment. is there. In this embodiment, the main iron core 41b of the first iron core 41 has a flat plate shape, but the lower end portion is formed in an L shape, and the pressing portion 41h that can come into contact with the lower end portion of the bimetal 42 serves as the drive portion. It is extended. The second iron core 44 has a main iron core 44a having a U-shaped cross section or a U-shaped cross section. In the present embodiment, the second iron core 44 is not provided with the position restricting projection 44c, and the upper end portion is brought into contact with the opposite portion between the first iron core 41 and the second iron core 44.
[0055]
As shown in FIG. 20, the attachment holding spring 49 includes a pair of fixing pieces 49b each having a fixing hole 49a into which a dowel (not shown) provided in the first iron core 41 is inserted and fixed. A spring piece 49c having an inclined portion is extended so as to increase the distance from the first iron core 41 upward. The upper end edge of each spring piece 49c is connected by a connecting piece 49d along the upper surface of the first iron core 41, and a pair of holding pieces 49e along the side surface of the second iron core 44 are suspended from both side edges of the connecting piece 49c. A caulking piece 49f that is engaged with a fixing groove 44e provided on the outer surface of the second iron core 44 and fixed by caulking is provided at the lower end of each hanging piece 49e.
[0056]
Accordingly, the first iron core 41, the second iron core 44, and the bimetal 42 are integrally coupled via the attachment holding spring 49, and the pressing portion 41h of the first iron core 41 is attached to the lower end portion of the bimetal 42 by the spring force of the spring piece 49c. Is kept in contact. Further, the position restricting piece 41 d which is the upper end portion of the first iron core 41 abuts on the position restricting protrusion 1 b provided on the container body 1 by the spring force of the spring piece 49 c.
[0057]
Thus, in the closed state of the contacts 2a and 2b, as shown in FIG. 17, the latch protrusion 41a is locked to the operating plate 33, and at this time, the spring force of the spring piece 49c is transmitted to the first iron core 41. Thus, the position restricting piece 41d of the first iron core 41 abuts on the position restricting projection 1b provided on the body 1, and the lower end portion of the bimetal 42 is kept in contact with the pressing portion 41h provided on the first iron core 41. Be drunk. At this time, only the upper end portion is kept in contact with the opposing surfaces of the first iron core 41 and the second iron core 44 (the lower end portion is open). If an overcurrent passes through the bimetal 42, as shown in FIG. 18, the lower end of the bimetal 42 bends so as to be displaced to the right, and the pressing portion 41h provided at the lower end of the first iron core 41 becomes the bimetal 42. The latch protrusion 41a releases the state of locking the operating plate 33 and opens the contacts 2a and 2b because it moves rightward when pressed. At this time, the first iron core 41 moves rightward, whereby the second iron core 44 is pushed rightward and the plastic deformation of the bimetal 42 is prevented. When a short-circuit current flows through the bimetal 42, as shown in FIG. 19, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0058]
(Sixth embodiment)
In the fifth embodiment, the second iron core 44 is movable, but in this embodiment, the second iron core 44 is fixed to the bimetal fixing plate 53 as shown in FIGS. Therefore, as shown in FIG. 24, the holding piece 49e in the attachment holding spring 49 is longer than that in the fifth embodiment. Other configurations are the same as those of the fifth embodiment.
[0059]
Thus, in the closed state of the contacts 2a and 2b, as shown in FIG. 21, the latch protrusion 41a is locked to the operating plate 33, and at this time, the spring force of the spring piece 49c is transmitted to the first iron core 41. Thus, the position restricting piece 41d of the first iron core 41 abuts on the position restricting projection 1b provided on the body 1, and the lower end portion of the bimetal 42 is kept in contact with the pressing portion 41h provided on the first iron core 41. Be drunk. At this time, only the upper end portion is kept in contact with the opposing surfaces of the first iron core 41 and the second iron core 44 (the lower end portion is open). If an overcurrent passes through the bimetal 42, the lower end portion of the bimetal 42 bends so as to be displaced to the right as shown in FIG. 22, and the pressing portion 41h provided at the lower end portion of the first iron core 41 becomes the bimetal 42. The latch protrusion 41a releases the state of locking the operating plate 33 and opens the contacts 2a and 2b because it moves rightward when pressed. Further, when a short-circuit current flows through the bimetal 42, as shown in FIG. 23, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0060]
(Seventh embodiment)
The tripping device 4 used in this embodiment has a configuration shown in FIGS. The first iron core 41 used in the present embodiment has a shaft support portion 41i above the main iron core 41b having a U-shaped cross section or a U-shaped cross section, and the shaft support portion 41i is supported by the body 1 so that the first iron core 41 The lower part is movable to the left and right in the figure. In addition, a pressing portion 41h as a drive portion that can come into contact with the lower end portion of the bimetal 42 is extended below the main iron core 41b of the first iron core 41 as in the fifth embodiment. On the other hand, the second iron core 44 is provided with a shaft support portion 44 f below the flat main core 44 a, and the shaft support portion 44 f is supported by the body 1. Further, a return spring 61 formed of a torsion coil spring is provided around the shaft support portion 44f, and urges the second iron core 44 counterclockwise in the drawing. The spring force by the return spring 61 is also transmitted to the first iron core 41 via the second iron core 44, and presses the first iron core 41 below the shaft support portion 44f. Will be energized. Here, the lower end portion of the first iron core 41 is in contact with the position restricting convex portion 1d provided on the inner peripheral surface of the vessel body 1, so that the movement range is restricted. Moreover, when the lower part of the 1st iron core 41 is contact | abutting to the position control convex part 1d, the opposing surface of the main iron core 41b of the 1st iron core 41 and the main iron core 44a of the 2nd iron core 44 contacts only an upper end part, and a lower end The parts are separated.
[0061]
Thus, in the closed state of the contacts 2a and 2b, as shown in FIG. 25, the latch protrusion 41a is locked to the operating plate 33, and at this time, the spring force of the return spring 61 is first via the second iron core 44. By being transmitted to the iron core 41, the lower part of the first iron core 41 is kept in contact with the position restricting convex portion 1 d provided on the container body 1. Further, in this state, the lower end portion of the bimetal 42 is in contact with the pressing portion 41 h provided in the first iron core 41, and only the upper end portion is in contact with the opposing surface of the first iron core 41 and the second iron core 44 (lower end) The part is kept open). If an overcurrent passes through the bimetal 42, the lower end portion of the bimetal 42 bends to the right as shown in FIG. 26, and the pressing portion 41h provided at the lower end portion of the first iron core 41 becomes the bimetal 42. The latch protrusion 41a releases the state of locking the operating plate 33 and opens the contacts 2a and 2b because it moves rightward when pressed. At this time, the first iron core 41 moves rightward, whereby the second iron core 44 is pushed rightward and the plastic deformation of the bimetal 42 is prevented. When a short-circuit current flows through the bimetal 42, as shown in FIG. 27, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. The moving range of the first iron core 41 is restricted by a position restricting protrusion 1e provided on the container body 1. Other configurations and operations are the same as those of the first embodiment.
[0062]
(Eighth embodiment)
The tripping device 4 used in this embodiment has the configuration shown in FIGS. The 1st iron core 41 used by this embodiment is provided with the pressing part 41h which can contact | abut to the lower end part of the bimetal 42 while a lower part is formed in L shape similarly to 5th Embodiment. On the other hand, the second iron core 44 has a main iron core 44a formed in a U-shaped cross section or a U-shaped cross section, and a position restricting projection 44c is provided on the lower surface side of the main iron core 44a. The position restricting protrusion 44c is restricted from moving to the left in the figure by a position restricting protrusion 1e provided on the inner peripheral surface of the container 1. The upper end portion of the bimetal 42 is bent in an L shape, and is fixed to the lower surface side of a fixed piece 53 a provided on a bimetal fixing plate 53 as a fixed electric path facing the bimetal 42. An L-shaped fixing piece 45g provided on an attachment spring 45 for connecting the first iron core 41 and the second iron core is fixed to the fixing piece 53a at a point X in the drawing. The lower part of the fixing piece 45g of the attachment spring 45 is fixed to the upper end portion of the first iron core 41 at a point Y in the figure. A pair of holding pieces 45e that contact the outer surface of the second iron core 44 are extended from the lower end of the fixing piece 45g, and are fixed by caulking to a fixing groove 44e provided in the second iron core 44 at the tip of the holding piece 45e. A caulking piece 45f is formed. The attachment spring 45 urges the lower part of the first iron core 41 to the left in the drawing, and the lower part of the first iron core 41 is restricted from moving leftward by a position restricting projection 1d provided on the body 1.
[0063]
In the configuration of the present embodiment, the first iron core 41 and the second iron core 44 are integrally coupled via the attachment spring 45, and the attachment spring 45 and the bimetal 42 are fixed to the bimetal fixing plate 53. The first iron core 41 and the second iron core 44 are integrated.
[0064]
In the closed state of the contacts 2a and 2b, as shown in FIG. 28, the latch protrusion 41a is locked to the operating plate 33. At this time, the lower portion of the first iron core 41 is lowered by the spring force of the mounting spring 45. The first iron core 41 is biased to the left, the lower portion of the first iron core 41 abuts on the position restricting convex portion 1d, the second iron core 44 is attracted toward the first iron core 41, and the second iron core 44 abuts on the position restricting projection 1e. . In this state, the opposed surfaces of the first iron core 41 and the second iron core 44 are kept in a state where only the upper end portion is in contact (the lower end portion is in an open state). If an overcurrent passes through the bimetal 42, as shown in FIG. 29, the lower end of the bimetal 42 bends so as to be displaced to the right, and the pushing as a drive unit extended to the lower end of the first iron core 41. Since the portion 41h moves to the right when pressed by the bimetal 42, the latch protrusion 41a releases the state of locking the operating plate 33 and opens the contacts 2a and 2b. At this time, the first iron core 41 moves rightward, whereby the second iron core 44 is pushed rightward and the plastic deformation of the bimetal 42 is prevented. Further, when a short-circuit current flows through the bimetal 42, as shown in FIG. 30, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0065]
(Ninth embodiment)
The tripping device 4 used in this embodiment has a configuration shown in FIGS. In the present embodiment, a configuration in which the second iron core 44 is fixed to the bimetal fixing plate 53 is employed as in the sixth embodiment. The first iron core 41 has a flat plate shape and is arranged so that only the upper end portion is in contact with the second iron core 44. On both side surfaces of the upper end portion of the first iron core 41, shafts 41j supported on a long groove-shaped bearing portion 1f formed in the left and right direction formed on the inner peripheral surface of the container body 1 are provided so as to be rotatable and bearings. It is movable within the range of the portion 1f. Further, the upper end portion of the first iron core 41 is urged by a return spring 62 made of a coil spring and pressed against the second iron core 44.
[0066]
The lower portion of the first iron core 41 is provided with a pressing portion 41h with which the lower end portion (free end) of the bimetal 42 can abut. The pressing portion 41h is formed by a coil spring held between the body 1 and the first metal core 41. The return spring 63 is biased so as to be pressed against the bimetal 42. Therefore, the upper end portion of the first iron core 41 contacts the upper end portion of the main iron core 44a of the second iron core 44, and the main iron core 44a and the first iron core 41 are separated from each other below the contact portion.
[0067]
Thus, in the closed state of the contacts 2a and 2b, as shown in FIG. 31, the latch protrusion 41a is locked to the operating plate 33. At this time, the lower portion of the first iron core 41 is bimetal 42 by the spring force of the return spring 63. The upper part of the first iron core 41 is kept in contact with the second iron core 44 by the return spring 62. In this state, the opposed surfaces of the first iron core 41 and the second iron core 44 are kept in a state where only the upper end portion is in contact (the lower end portion is in an open state). If an overcurrent passes through the bimetal 42, the lower end portion of the bimetal 42 bends so as to be displaced to the right as shown in FIG. 32, and the pressing portion 41h as a drive unit is pressed by the bimetal 42 to the right. Therefore, the latch projection 41a releases the state of locking the operating plate 33 and opens the contacts 2a and 2b. At this time, the return spring 63 is pressed and compressed by the lower end portion of the first iron core 41. When a short-circuit current flows through the bimetal 42, as shown in FIG. 33, the first iron core 41 is attracted to the second iron core 44, and the latch protrusion 41a releases the locked state of the operating plate 33. Other configurations and operations are the same as those of the first embodiment.
[0068]
【The invention's effect】
  Invention of Claim 1According to the configuration of the firstMain iron coreAnd secondMain iron coreAnd part ofSince they are in contact with each other, the electromagnetic attractive force is increased, and the size of each iron core can be reduced. Also, the locking part is made of ferrous ironIn mindBecause it is integrally formed,1st iron coreA separate locking member is not required and the number of parts can be reduced. As a result, the assemblability is improved, the size can be reduced, and the suction force between the first iron core and the second iron core can be increased. Furthermore, when an overcurrent flows, the bimetal is displaced. Due to the displacement of the bimetal, ferrous iron having a locking portion via a holding spring.HeartDriven and open / close mechanismAnd the locking state of the locking partIt can be released and the contacts can be forcibly opened. In addition, a large current such as a short circuit current flows.And having a locking partFerrous ironHeart2 ironTo approach the heartMove and open / close mechanismAnd the locking state of the locking partThe contact can be forcibly opened by releasing. In addition, when overcurrent flows, the displacement of the bimetalAccompanied byBoth the first iron core and the second iron core move together with the bimetal, thereby preventing the bimetal from warping and suppressing variations in overcurrent tripping characteristics.
[0070]
  Claim 2The invention ofClaim 1In the invention ofOpenClosingStructure and the person in chargeStopThe direction of the force acting on the locking portion from the opening / closing mechanism in the locked state is set to the direction from the fixed end of the bimetal toward the free end.When an overcurrent flows, the bimetal free end side opens and closes with a bimetal fixed end as a fulcrum.Acts on the locking part fromWeakenMove in directionSoThe locking state between the opening / closing mechanism and the locking partIt can be released quickly.
[0071]
  Claim 3The invention ofClaim 1In the invention ofOpenClosingStructure and the person in chargeStopThe direction of the force acting on the locking portion from the opening / closing mechanism in the locked state is set to the direction from the free end of the bimetal toward the fixed end.When an overcurrent flows, the bimetal free end side opens and closes with a bimetal fixed end as a fulcrum.Acts on the locking part fromStrengthen powerMove in directionOpening and closing machineStructureMake sure to lock it to the stop.It becomes easy.
[0073]
  Invention of Claim 4According to the configuration of the firstMain iron coreAnd secondMain iron coreAnd part ofSince they are in contact with each other, the electromagnetic attractive force is increased, and the size of each iron core can be reduced. Also, the locking part is made of ferrous ironIn mindBecause it is integrally formed,1st iron coreA separate locking member is not required and the number of parts can be reduced. As a result, the assemblability is improved, the size can be reduced, and the suction force between the first iron core and the second iron core can be increased. Furthermore, since the attachment holding spring in which the functions of the holding spring and the attachment spring are integrated is used, the number of parts can be reduced and the assemblability can be improved.
[0081]
  Invention of Claim 5According to the configuration of the firstMain iron coreAnd secondMain iron coreAnd part ofSince they are in contact with each other, the electromagnetic attractive force is increased, and the size of each iron core can be reduced. Also, the locking part is made of ferrous ironIn mindBecause it is integrally formed,1st iron coreA separate locking member is not required and the number of parts can be reduced. As a result, the assemblability is improved, the size can be reduced, and the suction force between the first iron core and the second iron core can be increased. Furthermore, when an overcurrent flows, the bimetal displaces, and the drive unit is driven by the bimetal to open and closeAnd the locking state of the locking partIt can be released and the contacts can be forcibly opened. In addition, ferrous iron with bimetal and locking partOne heartConnect to fixed circuitBecauseBlocking can be achieved and storage performance is improved.
[Brief description of the drawings]
FIG. 1 is a side view of a circuit breaker using a first embodiment of the present invention, in which a container body showing a closed state is opened.
FIG. 2 is a side view in which the container showing the open state in the above is opened.
FIG. 3 is a side view in which the container showing the open state at the time of overcurrent is opened.
FIG. 4 is a side view in which the body showing the open state at the time of the short circuit current is opened.
FIG. 5 is an exploded perspective view of the above.
FIG. 6 is a perspective view of the assembled state of the above.
FIG. 7 is a side view in a closed state showing a second embodiment of the present invention.
FIG. 8 is a side view showing an open state at the time of overcurrent.
FIG. 9 is a side view showing an open state at the time of a short-circuit current.
FIG. 10 is a side view in a closed state showing a third embodiment of the present invention.
FIG. 11 is a side view showing an open state at the time of overcurrent.
FIG. 12 is a side view showing an open state at the time of a short-circuit current.
FIG. 13 is a perspective view showing an attachment holding spring used in the above.
FIG. 14 is a side view in a closed state showing a fourth embodiment of the present invention.
FIG. 15 is a side view showing an open state at the time of overcurrent.
FIG. 16 is a side view showing an open state at the time of a short-circuit current.
FIG. 17 is a side view of a closed state showing a fifth embodiment of the present invention.
FIG. 18 is a side view showing an open state during an overcurrent.
FIG. 19 is a side view showing an open state at the time of a short-circuit current.
FIG. 20 is a perspective view showing an attachment holding spring used in the above.
FIG. 21 is a side view of a closed state showing a sixth embodiment of the present invention.
FIG. 22 is a side view showing an open state during an overcurrent.
FIG. 23 is a side view showing an open state at the time of a short-circuit current.
FIG. 24 is a perspective view showing an attachment holding spring used in the above.
FIG. 25 is a side view of a closed state showing a seventh embodiment of the present invention.
FIG. 26 is a side view showing an open state during an overcurrent.
FIG. 27 is a side view showing an open state at the time of a short-circuit current.
FIG. 28 is a side view in a closed state showing an eighth embodiment of the present invention.
FIG. 29 is a side view showing an open state during an overcurrent.
FIG. 30 is a side view showing the open state at the time of the short-circuit current.
FIG. 31 is a side view in a closed state showing a ninth embodiment of the present invention.
FIG. 32 is a side view showing an open state during an overcurrent.
FIG. 33 is a side view showing an open state at the time of a short-circuit current.
[Explanation of symbols]
1 body
1c Position restriction groove
1e Position restriction protrusion
2a, 2b contact
3 Opening / closing mechanism
4 Tripping device
41 1st iron core
41a Latch projection
41b Main iron core
41h Pushing part
42 Bimetal
43 Holding spring
44 2nd iron core
44a Main iron core
45 Mounting spring
48 Mounting retention spring
49 Mounting retention spring
46 Return spring
61 Return spring
62 Return spring
63 Return spring

Claims (5)

電源と負荷との間の通電電路に挿入された接点と、接点の閉極時に接点を開極する向きの力を蓄えて係止状態とし係止状態が解除されると前記力により接点を強制開極させる開閉機構とを器体に備える回路遮断器に用いられ、接点の閉極時に過電流または大電流が前記通電電路に流れると前記係止状態を解除して接点を強制開極させる引外し装置であって、前記通電電路に挿入され長手方向の一端部を固定端とし他端部を自由端とし通電電路に過電流が流れると固定端に対して自由端が厚み方向に変位するバイメタルと、接点の閉極時に開閉機構の一部を係止して係止状態とする係止部を備えた第１鉄心と、第１鉄心に設けた第１の主鉄心とともにバイメタルの長手方向の中間部を囲繞するように配置される第２の主鉄心を備える第２鉄心と、過電流によりバイメタルの自由端が固定端に対して変位したときに第１鉄心がバイメタルとともに変位して係止部と開閉機構との係止状態が解除されるように第１鉄心をバイメタルの自由端と連結する板ばねよりなる保持ばねと、第１の主鉄心と第２の主鉄心との対向面においてバイメタルの長手方向に沿った一端部では互いに当接し他端部では互いに離間するように第１鉄心と第２鉄心とを連結する板ばねよりなる取付ばねとを設け、通電電路に大電流が流れると第１鉄心と第２鉄心との間に吸引力が作用し第１の主鉄心と第２の主鉄心との間の離間した部位が吸着されて開閉機構と係止部との係止状態が解除される構成とし、第２鉄心の第１鉄心に向かう向きの移動を規制するように第２鉄心の一部に当接する移動規制部を器体に設けたことを特徴とする回路遮断器の引外し装置。The contact inserted in the current path between the power source and the load and the force that opens the contact when the contact is closed are stored in the locked state, and when the locked state is released, the contact is forced by the force It is used in circuit breakers equipped with an open / close mechanism in the body, and when overcurrent or large current flows through the energizing circuit when the contact is closed, the latching state is released and the contact is forcibly opened. A bimetal that is inserted into the energizing circuit and has one end in the longitudinal direction as a fixed end and the other end as a free end, and when the overcurrent flows through the energizing circuit, the free end is displaced in the thickness direction with respect to the fixed end And a first iron core provided with a locking portion that locks a part of the opening / closing mechanism when the contact is closed, and a first main iron core provided in the first iron core in the longitudinal direction of the bimetal. a second core including a second main core that will be disposed so as to surround the intermediate portion Free first core such that the free end of the bimetal first iron core is engaging state between the engaging portion and displaced together with the bimetal and the opening and closing mechanism is released when the displacement with respect to the fixed end of the bimetal overcurrent A holding spring composed of a leaf spring connected to the end, and one end portion along the longitudinal direction of the bimetal on the opposing surface of the first main iron core and the second main iron core are in contact with each other and separated from each other in the other end portion and a mounting spring made of plate spring you connecting the first core and the second core is provided, a large current flows through the current path main attraction act first between the first core and the second core A configuration is adopted in which the distant state between the iron core and the second main iron core is adsorbed and the locking state between the opening and closing mechanism and the locking portion is released, and the movement of the second iron core in the direction toward the first iron core is restricted. provided a movement regulating portion which abuts on a part of the second core so as to device body Trip unit of the circuit breaker, characterized in that. 前記開閉機構と前記係止部との係止状態において開閉機構から係止部に作用する力の向きを、前記バイメタルの固定端から自由端に向かう向きとしたことを特徴とする請求項１記載の回路遮断器の引外し装置。Claims, characterized in that the open 閉機structure and the locking portion and the force of the direction that acts on the locking portion from the opening and closing mechanism in the locked state of, and the direction toward the free end from the fixed end of the bimetal The circuit breaker tripping device according to claim 1. 前記開閉機構と前記係止部との係止状態において開閉機構から係止部に作用する力の向きを、前記バイメタルの自由端から固定端に向かう向きとしたことを特徴とする請求項１記載の回路遮断器の引外し装置。Claims, characterized in that the orientation of the force acting on the locking portion from the opening and closing mechanism in the locked state of the open閉機structure with the locking portion, and the direction toward the fixed end from the free end of the bimetallic The circuit breaker tripping device according to claim 1. 電源と負荷との間の通電電路に挿入された接点と、接点の閉極時に接点を開極する向きの力を蓄えて係止状態とし係止状態が解除されると前記力により接点を強制開極させる開閉機構とを器体に備える回路遮断器に用いられ、接点の閉極時に過電流または大電流が前記通電電路に流れると前記係止状態を解除して接点を強制開極させる引外し装置であって、前記通電電路に挿入され長手方向の一端部を固定端とし他端部を自由端とし通電電路に過電流が流れると固定端に対して自由端が厚み方向に変位するバイメタルと、接点の閉極時に開閉機構の一部を係止して係止状態とする係止部を備えた第１鉄心と、第１鉄心に設けた第１の主鉄心とともにバイメタルの長手方向の中間部を囲繞するように配置される第２の主鉄心を備える第２鉄心と、過電流によりバイメタルの自由端が固定端に対して変位したときに第１鉄心がバイメタルとともに変位して係止部と開閉機構との係止状態が解除されるように第１鉄心をバイメタルの自由端と連結し、かつ第１の主鉄心と第２の主鉄心との対向面においてバイメタルの長手方向に沿った一端部では互いに当接し他端部では互いに離間するように第１鉄心と第２鉄心とを連結する板ばねよりなる取付保持ばねとを設け、通電電路に大電流が流れると第１鉄心と第２鉄心との間に吸引力が作用し第１の主鉄心と第２の主鉄心との間の離間した部位が吸着されて開閉機構と係止部との係止状態が解除される構成とし、第２鉄心の第１鉄心に向かう向きの移動を規制するように第２鉄心の一部に当接する移動規制部を器体に設けたことを特徴とする回路遮断器の引外し装置。The contact inserted in the current path between the power source and the load and the force that opens the contact when the contact is closed are stored in the locked state, and when the locked state is released, the contact is forced by the force It is used in circuit breakers equipped with an open / close mechanism in the body, and when overcurrent or large current flows through the energizing circuit when the contact is closed, the latching state is released and the contact is forcibly opened. A bimetal that is inserted into the energization circuit and has one end in the longitudinal direction as a fixed end and the other end as a free end, and when the overcurrent flows through the energization circuit, the free end is displaced in the thickness direction with respect to the fixed end. And a first iron core provided with a locking portion that locks a part of the opening / closing mechanism when the contact is closed, and a first main iron core provided in the first iron core in the longitudinal direction of the bimetal. a second core including a second main iron core is arranged so as to surround the intermediate portion Free first core such that the free end of the bimetal first iron core is engaging state between the engaging portion and displaced together with the bimetal and the opening and closing mechanism is released when the displacement with respect to the fixed end of the bimetal overcurrent The first core and the second core are connected to each other and are in contact with each other at one end along the longitudinal direction of the bimetal on the opposing surfaces of the first main iron core and the second main iron core and are separated from each other at the other end . and a mounting holding spring made of plate spring you consolidated and core provided, a large current flows through the current path and the first main core attraction force acts between the first core and the second core second The portion spaced from the main iron core is adsorbed so that the locking state between the opening / closing mechanism and the locking portion is released, and the second iron core is controlled to move in the direction toward the first iron core. characterized in that a movement restricting portion abutting on a part of the 2 core to the device body Trip unit of road breaker. 電源と負荷との間の通電電路に挿入された接点と、接点の閉極時に接点を開極する向きの力を蓄えて係止状態とし係止状態が解除されると前記力により接点を強制開極させる開閉機構とを器体に備える回路遮断器に用いられ、接点の閉極時に過電流または大電流が前記通電電路に流れると前記係止状態を解除して接点を強制開極させる引外し装置であって、前記通電電路に挿入され長手方向の一端部を固定端とし他端部を自由端とし通電電路に過電流が流れると固定端に対して自由端が厚み方向に変位するバイメタルと、接点の閉極時に開閉機構の一部を係止して係止状態とする係止部を備えた第１鉄心 と、第１鉄心に設けた第１の主鉄心とともにバイメタルの長手方向の中間部を囲繞するように配置される第２の主鉄心を備える第２鉄心と、第１鉄心から延出され過電流によりバイメタルの自由端が固定端に対して変位したときにバイメタルの自由端に押圧されることにより第１鉄心をバイメタルとともに変位させて係止部と開閉機構との係止状態を解除させる駆動部と、第１の主鉄心と第２の主鉄心との対向面においてバイメタルの長手方向に沿った一端部では互いに当接し他端部では互いに離間するように第１鉄心と第２鉄心とを連結する板ばねよりなる取付ばねと、取付ばねとバイメタルとが固着されバイメタルとともに通電電路を形成するバイメタル固定板とを備え、通電電路に大電流が流れると第１鉄心と第２鉄心との間に吸引力が作用し第１の主鉄心と第２の主鉄心との間の離間した部位が吸着されて開閉機構と係止部との係止状態が解除される構成とし、第２鉄心の第１鉄心に向かう向きの移動を規制するように第２鉄心の一部に当接する移動規制部を器体に設けたことを特徴とする回路遮断器の引外し装置。The contact inserted in the current path between the power source and the load and the force that opens the contact when the contact is closed are stored in the locked state, and when the locked state is released, the contact is forced by the force It is used in circuit breakers equipped with an open / close mechanism in the body, and when overcurrent or large current flows through the energizing circuit when the contact is closed, the latching state is released and the contact is forcibly opened. A bimetal that is inserted into the energizing circuit and has one end in the longitudinal direction as a fixed end and the other end as a free end, and when the overcurrent flows through the energizing circuit, the free end is displaced in the thickness direction with respect to the fixed end And a first iron core provided with a locking portion that locks a part of the opening / closing mechanism when the contact is closed, and a first main iron core provided in the first iron core in the longitudinal direction of the bimetal. a second core including a second main iron core is arranged so as to surround the intermediate portion When the free end of the bimetal extends from the first iron core and is displaced with respect to the fixed end due to overcurrent, the first iron core is displaced together with the bimetal by being pressed against the free end of the bimetal, and the locking portion and the opening / closing mechanism The driving portion that releases the locked state of the first metal core and the second main iron core are opposed to each other at one end portion along the longitudinal direction of the bimetal on the opposing surfaces of the first main iron core and the second main iron core, and separated from each other at the other end portion . When a large current flows through the energizing circuit, the mounting spring is composed of a leaf spring that connects the first iron core and the second iron core, and the bimetal fixing plate is formed by fixing the mounting spring and the bimetal together to form the energizing circuit. A suction force acts between the iron core and the second iron core, and the separated portion between the first main iron core and the second main iron core is adsorbed, and the locking state between the opening / closing mechanism and the locking portion is released. The second iron core First tripping of the circuit breaker, characterized in that the movement restricting portion abutting a portion of the second core so as to restrict the movement of the direction towards the core provided in the device body and device.
JP2000207585A 2000-07-07 2000-07-07 Circuit breaker trip device Expired - Lifetime JP3763250B2 (en)

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