JP3657202B2

JP3657202B2 - Breaker device

Info

Publication number: JP3657202B2
Application number: JP2001123305A
Authority: JP
Inventors: 一元近田
Original assignee: Sumitomo Wiring Systems Ltd; AutoNetworks Technologies Ltd; Sumitomo Electric Industries Ltd
Current assignee: Sumitomo Wiring Systems Ltd; AutoNetworks Technologies Ltd; Sumitomo Electric Industries Ltd
Priority date: 2001-04-20
Filing date: 2001-04-20
Publication date: 2005-06-08
Anticipated expiration: 2021-04-20
Also published as: JP2002319340A

Description

【０００１】
【発明の属する技術分野】
本発明は、着脱可能なヒューズと抜き挿し可能な短絡プラグとを備えたブレーカ装置に関するものである。
【０００２】
【従来の技術】
ブレーカ装置として、着脱可能なヒューズと、短絡プラグの差込みにより短絡されるとともに短絡プラグの抜取りにより短絡解除される一対の電極とを直列に設けたものがある。
通常は、ヒューズが取り付けられている状態で短絡プラグを電極に差し込んでおくことにより、回路を閉じた状態にしておく。回路のメンテナンスなどのために回路を開く際には、ヒューズを取り付けた状態のままで、短絡プラグを電極から抜き取ることによってその電極間の短絡を解除する。
【０００３】
また、ヒューズを交換する際には、予め、短絡プラグを電極から抜き取って回路を開いた状態にしておき、その状態で、ヒューズを外して新しいヒューズを取り付ける。そして、ヒューズの交換が済んだ後に、短絡プラグを電極に差し込み、回路を閉じた状態にする。
【０００４】
【発明が解決しようとする課題】
上記のようなブレーカ装置では、短絡プラグが電極に差し込まれた状態のままでヒューズ交換を行うと、新しいヒューズを装着したときに、装着と同時に回路が閉じてアークが飛ぶ虞がある。そのため、短絡プラグが差し込まれている状態ではヒューズの着脱が出来ないようにするための手段が望まれる。
【０００５】
本願発明は上記事情に鑑みて創案され、短絡プラグが差し込まれている状態ではヒューズの着脱が出来ないようにすることを目的としている。
【０００６】
【課題を解決するための手段】
請求項１の発明は、着脱可能なヒューズと、短絡プラグの差込みにより短絡されるとともに短絡プラグの抜取りにより短絡解除される一対の電極とを直列に設けたものであって、前記電極が固定されているとともに前記短絡プラグの着脱を可能とされたケースと、このケースに形成され、前記ヒューズが収容される収容空間と、この収容空間の開口部に対して着脱可能とされ、その開口部に取り付けられた状態では前記収容空間内の前記ヒューズが取り外されることを規制するヒューズカバーと、前記短絡プラグと前記ヒューズカバーとに設けられ、前記短絡プラグが前記カバーに取り付けられて前記電極に差し込まれるとともに前記ヒューズカバーが前記収容空間の開口部に取り付けられている状態では互いに係止することで前記ヒューズカバーが外れることを規制し、且つ前記短絡プラグが前記カバーから外されて前記電極から抜かれた状態では前記ヒューズカバーが外れることを許容する係止手段が設けられており、前記ケースに取り付けられた前記短絡プラグは、前記一対の電極との接触状態を保ったままで、前記短絡プラグの前記ケースに対する着脱が許容される操作位置と、前記短絡プラグの前記ケースからの外れが規制される格納位置との間で回動可能とされている構成とした。
【０００７】
請求項２の発明は、請求項１の発明において、前記ヒューズカバーには、前記収容空間の開口部に取り付けられた状態において前記電極に対する前記短絡プラグの差込み方向と平行なガイド溝が形成されているとともに、前記短絡プラグには、前記ガイド溝に沿って移動可能な突起状の被ガイド部が形成され、前記ガイド溝の奥端が前記ヒューズカバー側の係止手段とされ、前記被ガイド部が前記前記短絡プラグ側の係止手段とされている構成とした。
【０００８】
請求項３の発明は、請求項２の発明において、前記ガイド溝の奥端が軸受部とされているとともに、前記被ガイド部が前記軸受部内での回動を可能とされており、前記電極と前記ヒューズが、スイッチング手段の開閉作動によって開閉される回路に接続され、前記電極に差し込まれた状態の前記短絡プラグが前記軸受部内の前記被ガイド部を中心として格納位置へ回動したことを検知して前記スイッチング手段を閉作動させるとともに、前記短絡プラグが格納位置から操作位置側へ回動する過程でその回動を検知して前記スイッチング手段に開作動を開始させる変位動作検知手段とを備えている構成とした。
【０００９】
請求項４の発明は、請求項３の発明において、前記短絡プラグが前記電極に対して正規に差し込まれて前記被ガイド部が前記軸受部に係止した状態ではその短絡プラグの操作位置から格納位置側への変位を許容するが、前記短絡プラグが不正な差込み状態のときにはその短絡プラグと干渉してその短絡プラグが格納位置側へ変位することを規制する差込み状態検知手段を設けた構成とした。
請求項５の発明は、請求項３又は請求項４の発明において、前記短絡プラグに設けられ、その短絡プラグを格納位置から操作位置へ回動させるための変位操作用指掛け部と、前記短絡プラグにおける前記変位操作用指掛け部とは異なる位置に設けられ、前記短絡プラグを前記電極から抜き取るための抜取り用指掛け部と、前記短絡プラグが格納位置にある状態では前記変位操作用指掛け部に対する指の引っ掛け動作を許容するが前記抜取り用指掛け部への指の引っ掛け動作を規制し、且つ前記短絡プラグが操作位置へ変位した状態では前記抜取り用指掛け部への指の引っ掛け動作を許容する指掛け規制手段とを備えている構成とした。
【００１０】
【発明の作用及び効果】
［請求項１の発明］
短絡プラグが電極に差し込まれている状態では、係止手段によりヒューズカバーが外れることが規制されているので、ヒューズを外すことはできない。ヒューズを外すためには、予め短絡プラグを抜いてヒューズカバーを外せる状態にしておかなければならないので、短絡プラグが差し込まれている状態のままでヒューズが着脱されることを防止することができる。
【００１１】
［請求項２の発明］
短絡プラグを電極に差し込む際には、被ガイド部をガイド溝に沿わせることにより短絡プラグが案内されるので、短絡プラグの差込み操作を確実に行うことが出来る。しかも、ガイド溝の奥端と被ガイド部が係止手段を兼用しているので、専用の係止手段を別個に設ける場合に比べると、ヒューズカバーと短絡プラグの形状の簡素化を図ることができる。
［請求項３の発明］
短絡プラグが電極に差し込まれるとともに格納位置に回動変位した状態では回路が閉じた状態となる。この状態から、短絡プラグを格納位置から操作位置へ向けて回動させると、その回動の途中でスイッチング手段が開作動を開始し、その開作動が完了すると主回路が開いた状態となる。この後、短絡プラグを電極から抜き取ると、電極対の間の通電が阻止されるが、このとき既に主回路はスイッチング手段の開作動によって開いていているので、電極と短絡プラグとの間にアークが発生することはない。
【００１２】
［請求項４の発明］
差込み状態検知手段を設けたことより、短絡プラグの格納位置への回動の可否に基づいて、電極に対する短絡プラグの差込み状態、ひいては、ヒューズカバーが外れ規制状態になっているか否かを検知することができる。
［請求項５の発明］
スイッチング手段を開作動させるための短絡プラグの回動操作から、その後の電極から短絡プラグを抜き取る操作へ移行するときには、指を異なる指掛け部に掛け替える必要があるので、スイッチング手段の開作動が開始してからその開作動が完了して主回路が閉じるまでの間にタイムラグがあっても、短絡プラグの抜取り操作は、開作動が完了して主回路が開いた後で行われるようになる。したがって、主回路が閉じた状態のままであるにも拘わらず電極から短絡プラグが抜き取られてしまう、ということはない。
【００１３】
【発明の実施の形態】
［実施形態１］
以下、本発明を具体化した実施形態１を図１乃至図１４を参照して説明する。本実施形態１のブレーカ装置Ａは、リレー（本発明の構成要件であるスイッチング手段）の開閉作動により開閉される回路（図示せず）にヒューズ１１及び一対の電極１４を直列に設け、その電極１４に短絡プラグ３０を抜き差しすることによりリレーの開閉作動とは独立して電極１４の間の通電を許容又は阻止できるようにしたものである。尚、以下の説明において、前後方向については図１における斜め右上方を前方とし、左右方向については図１における斜め右下方を右方とする。
【００１４】
上面が開放されたケース１０は、ヒューズ１１が収容された前後方向に長い方形の収容空間１２と、この収容空間１２の前端と連通する左右方向に長い方形の格納空間１３とを備えている。
収容空間１２は、その上面が全体に亘って方形に開放された開口部１２Ａとなっており、前端部では格納空間１３と連通している。収容空間１２を構成する周壁の後外面には抜止め突起１２Ｂが形成されている。収容空間１２内には前後一対のボルト１２Ｃが立設されており、ヒューズ１１は、その前後両端部をボルト１２Ｃに嵌合した状態でナット１２Ｄにより固定されている。また、ナット１２Ｄをボルト１２Ｃから外せば、ヒューズ１１を外すことができる。
【００１５】
ケース１０には、収容空間１２の開口部１２Ａを全体に亘って覆い隠すヒューズカバー５０が取り付けられる。ヒューズカバー５０は、開口部１２Ａを塞ぐ上面板５１と、収容空間１２の左右両壁及び後壁の外面に嵌合する略Ｕ字形のガイド壁５２と、収容空間１２と格納空間１３との連通部を塞ぐ前面壁５３とからなる。また、ガイド壁５２の後面部には抜止め突起１２Ｂと係止する抜止孔５４が形成されている。
【００１６】
かかるヒューズカバー５０は、そのガイド壁５２を収容空間１２の周壁に外嵌するとともに、前面壁５３を収容空間１２と格納空間１３との連通部に嵌入させるようにして取り付けられる。この状態では、ヒューズカバー５０はその後端部においては抜止孔５４と抜止め突起１２Ｂとの係止によりケース１０からの外れを規制されているが、前端部においては上方へ持ち上げることができるようになっている。しかし、後述するように短絡プラグ３０が電極１４に差し込まれた状態では、ヒューズカバー５０はその前端部においても上方への遊動が規制され、もって、ヒューズカバー５０がケース１０に対して離脱規制状態に取り付けられる。また、短絡プラグ３０を抜き取った状態では、抜止め突起１２Ｂから抜止孔５４を外しつつヒューズカバー５０をケース１０に対して上方へ離脱させることができる。
【００１７】
ヒューズカバー５０の前面壁５３には、円形孔状をなす軸受部５５（本発明の構成要件である係止手段）と、この軸受部５５の内径よりも幅が狭くその軸受部５５の上端から前面壁５３の上端縁に連通する上下方向（電極１４に対する短絡プラグ３０の抜き差し方向と平行な方向）のガイド溝５６（本発明の構成要件である差込み状態検知手段）とが形成されている。
格納空間１３内には、上下方向に細長い板状をなす一対の電極１４が支柱１５の前後両側面に沿って固定されている。一対の電極１４のうち、後側の電極１４は、収容空間１２内のボルト１２Ｃにヒューズ１１の前端部と共締めにより固定されており、もって、ヒューズ１１と電極１４とが直列接続状態となっている。また、格納空間１３内における両電極１４よりも右方の位置には、前後一対の端子金具１６（本発明の構成要件である変位動作検知手段）が上向きに固定されている。この一対の端子金具１６はリレーを構成するものであり、この両端子金具１６に対して短絡プラグ３０の短絡端子４２（本発明の構成要件である変位動作検知手段）が上方から嵌合されるとその両端子金具１６が短絡状態とされ、両端子金具１６から短絡端子４２が離脱されると両端子金具１６の短絡が解除されて回路が開くようになっている。
【００１８】
格納空間１３を構成する周壁の前壁１７Ｆには、円形孔状の軸受部１８と、この軸受部１８の内径よりも幅が狭くその軸受部１８の上端から前壁１７Ｆの上端縁に連通する上下方向（電極１４に対する短絡プラグ３０の抜き差し方向と平行な方向）のガイド溝１９（本発明の構成要件である差込み状態検知手段）とが形成されている。この軸受部１８とガイド溝１９は、ヒューズカバー５０の軸受部５５及びガイド溝５６と寸法及び上下左右方向の位置が同じとされている。また、格納空間１３における軸受部１８よりも右方位置には、格納空間１３の前後両壁１７Ｆ，１７Ｒの中間高さから立ち上がると共に上端に内向きの爪を有する前後一対の弾性係止片２０が、前壁１７Ｆ及び後壁１７Ｒに沿うように形成されている。
【００１９】
また、格納空間１３の前壁１７Ｆ及び後壁１７Ｒにおける略右半分領域は、操作部３４が格納位置にある状態でその抜取り用指掛け部３５に対する指の引掛け動作を規制する指掛け規制部２１（本発明の構成要件である指掛け規制手段）となっている。また、格納空間１３の右壁１７Ｓには、操作部３４が格納位置にある状態でその変位操作用指掛け部３６に対する指の引掛け動作を許容する切欠部２２（本発明の構成要件である指掛け規制手段）が形成されている。
【００２０】
短絡プラグ３０は、絶縁性樹脂材料からなるプラグ本体３１と、金属板材を曲げ加工してなる短絡部材４１と、金属板材を曲げ加工してなる短絡端子４２とを備えて構成される。プラグ本体３１について説明すると、基板部３２の前後両側縁からは前後一対の方形の保護板部３３が延出されており、この一対の保護板部３３の間には短絡部材４１が収容されている。短絡部材４１は、弧状をなす連結部４１Ａの両端から保護板部３３の内面に沿うように略Ｓ字形をなす前後一対の弾性接触片４１Ｂを延出させた形態とされている。
【００２１】
基板部３２には、保護板部３３とは反対側に突出する操作部３４が一体に変位し得るように形成されている。操作部３４は、抜取り用指掛け部３５と変位操作用指掛け部３６とを有する。抜取り用指掛け部３５は、基板部３２の両端から保護板部３３とは反対側に立ち上がる一対の立上り部３７の立ち上がり端同士の間に基板部３２と平行に差し渡された形態である。この抜取り用指掛け部３５は、その前方又は後方から手の指を例えば２〜３本同時に引っ掛けることができるような大きさとされており、この抜取り用指掛け部３５に指を掛けることで操作部３４をしっかり掴むことができる。また、変位操作用指掛け部３６は、抜取り用指掛け部３５における一端部から基板部３２とは反対側（外側）へ突出する形態とされ、この変位操作用指掛け部３６には、抜取り用指掛け部３５に対する指の引掛け方向と直交する方向（抜取り用指掛け部３５の長さ方向と平行な方向）から１本の指の指先だけを引っ掛けることができるようになっている。
【００２２】
また、プラグ本体３１には、抜取り用指掛け部３５における一方（変位操作用指掛け部３６の形成されている側とは反対側）の立上り部３７の基端部に位置するように収容部３８が形成されている。収容部３８は、立上り部３７の外面側に向かって開口されていて、その収容部３８内には変位動作検知手段を構成する短絡端子４２が収容されている。短絡端子４２は、板状の連結部４２Ａから前後一対の略三角形をなす板状の接触部４２Ｂを延出したものであり、この一対の接触部４２Ｂがケース１０に設けた一対の端子金具１６に対して差し込まれる。さらに、抜取り用指掛け部３５における他方の立上り部３７の側縁には、弾性係止片２０が係止される被係止部３９が形成されている。
【００２３】
また、一対の保護板部３３の外面には、前後一対の被ガイド部４０（本発明の構成要件である係止手段、差込み状態検知手段）が突出形成されている。この被ガイド部４０の外周は、基板部３２と直交する方向（電極１４に対する短絡プラグ３０の抜き差し方向）の一対の平坦部３２Ｆと、この両平坦部３２Ｆの両端同士を繋ぐ一対の円弧部３２Ｓとから構成されている。一対の平坦部３２Ｆの間の間隔は、ガイド溝１９，５６の溝の幅寸法と同じかそれよりも僅かに小さい寸法とされているとともに、一対の円弧部３２Ｓ間の最大距離はガイド溝１９，５６の幅よりも大きい寸法とされており、この寸法設定により、ガイド溝１９，５６の内部では被ガイド部４０が回転できないようになっている。また、一対の円弧部３２Ｓは、共通の仮想円（図示せず）に沿った形態とされており、その共通の仮想円の直径は軸受部１８，５５の内径と同じかそれよりも僅かに小さい寸法とされており、かかる寸法により、被ガイド部４０は軸受部１８，５５内では回転できるようになっている。
【００２４】
次に、本実施形態の作用を説明する。
組付けに際しては、まず、収容空間１２内にヒューズ１１を取り付けるとともに、収容空間１２の開口部１２Ａにヒューズカバー５０を被せておく。この状態では、収容空間１２の開口部１２Ａが塞がれるので、ヒューズ１１の交換などを行うことはできない。この状態から、図１に示すように、ケース１０の上方において短絡プラグ３０を変位操作用指掛け部３６が上方を向く姿勢（被ガイド部４０の平坦部４０Ｆが上下方向を向く）とし、この姿勢のまま両被ガイド部４０をガイド溝１９，５６に嵌合させてそのガイド溝１９，５６にガイドされつつ短絡プラグ３０を電極１４に対して上から被せるように差し込む。このとき短絡プラグ３０は操作位置にあり、図９に示すように、短絡部材４１の弾性接触部４１Ｂが両電極１４に接触してその両電極１４間を導通可能な状態とする。但し、この時点では回路はまだ閉じた状態（通電可能な状態）とはなっていない。また、この短絡プラグ３０が正規に差し込まれた状態では、被ガイド部４０がヒューズカバー５０の前端部に形成されている軸受部５５の内周に対して上から押さえ付けるように当接するので、抜止め突起１２Ｂと抜止孔５４の係止作用との協動により、ヒューズカバー５０がケース１０から外れることが規制される。
【００２５】
この後、操作部３４を指で押し、軸受部１８，５５内で被ガイド部４０を回転させつつ短絡プラグ３０を右側へ倒すように９０°回転させると、短絡プラグ３０は格納位置となる（図３，６，８，１２を参照）。短絡プラグ３０が操作位置から格納位置へ変位する間、短絡部材４１は電極１４に接触した状態（電極１４を導通可能とする状態）を保つ。
尚、短絡プラグ３０が正規の差込み状態になっていないときには、図１３に示すように、被ガイド部４０が軸受部１８，５５まで達せずにガイド溝１９，５６内に留まったままであるが、被ガイド部４０はガイド溝１９，５６内では回転できない。したがって、この不正な差込み状態では、短絡プラグ３０を格納位置へ回転させることはできない。また、被ガイド部４０がヒューズカバー５０の軸受部５５に当接していないので、ヒューズカバー５０をケース１０から外しうる状態となっている。したがって、この場合には、短絡プラグ３０を正規の差込み状態となるまで、もう一度差し込む操作を行う必要がある。
【００２６】
短絡プラグ３０が格納位置に変位した状態では、短絡端子４２が一対の端子金具１６を短絡させ、これにより、短絡プラグ３０が格納位置に変位したことが検知され、リレーが閉作動し、もって、回路が閉じた状態となる。また、この格納状態では、弾性係止片２０が操作部３４の被係止部３９に対して弾性的に係止することにより、操作部３４は、操作位置側への遊動を規制されて格納位置に保持される。さらに、軸受部１８，５５内では被ガイド部４０が平坦部４０Ｆをガイド溝１９，５６に対して直交させる向きになるが、この状態では、図１２に示すように、被ガイド部４０は、軸受部１８，５５からそれよりも幅の狭いガイド溝１９，５６へ進入することはできないため、短絡プラグ３０の上方への変位、即ち電極１４から抜き取る方向への変位を規制され、ひいては、ヒューズカバー５０のケース１０からの上方への外れが規制される。
【００２７】
次に、短絡プラグ３０がケース１０内に格納されるとともに、回路が閉じている状態から、回路を開いてヒューズ１１を交換する手順について説明する。
格納状態では、図３に示すように、抜取り用指掛け部３５が格納空間１３の前後両壁１７Ｆ，１７Ｒの指掛け規制部２１との間に完全に収容され、抜取り用指掛け部３５の内側に指を差し込むことができない。一方、変位操作用指掛け部３６は、右壁１７Ｓの切欠部２２から外部へ突出していて指を引っ掛けることが可能な状態となっている。
【００２８】
そこで、まず、この変位操作用指掛け部３６に指先を引っ掛け、操作部３４に対して弾性係止片２０と被係止部３９との係止力を上回る上向きの操作力を付与することにより、短絡プラグ３０を上方へ変位させる。このとき、被ガイド部４０は軸受部１８，５５内で回動するだけであってガイド溝１９，５６へ変位することはないので、短絡プラグ３０は被ガイド部４０（軸受部１８，５５）を中心として回動する。短絡プラグ３０の回動変位が開始されると、その開始直後（短絡プラグ３０が操作位置へ達するより前）に、短絡端子４２が一対の端子金具１６から離間し、両端子金具１６の短絡が解除され、短絡プラグ３０が操作位置側への変位を開始したことが検知される。この検知により、リレーが励磁されて回路を開くための開作動を開始するが、この開作動が開始してから完了するまでにはタイムラグがあり、開作動が完了すると回路が開く。尚、このとき、電極１４は短絡部材４１によって導通可能な状態に保たれている。
【００２９】
この後、さらに短絡プラグ３０の回動操作を続けると、短絡プラグ３０が操作位置に達し、軸受部１８，５５内の被ガイド部４０がガイド溝１９，５６へ移動し得る状態になるとともに、抜取り用指掛け部３５が格納空間１３から上方へ露出して指を引掛けうる状態となる。そこで、変位操作用指掛け部３６に引っ掛けていた指を離し、抜取り用指掛け部３５に指を掛け替えて、操作部３４を掴む。尚、この状態では、短絡プラグ３０がまだ電極１４に差し込まれた状態のままなので、ヒューズカバー５０のケース１０からの外れは規制されている。
【００３０】
この状態で操作部３４を持ち上げれば、短絡プラグ３０が電極１４から抜き取られ、電極１４の間が導通不能な状態となる。電極１４から短絡プラグ３０を抜いた時点では、既に、リレーの開作動によって回路は開いた状態となっているので、電極１４と短絡部材４１との間にアークが発生することはない。
また、短絡プラグ３０が抜き取られると、ヒューズカバー５０の前端部では軸受部５５が被ガイド部４０による当接から解放されるので、ヒューズカバー５０をケース１０から上方へ外すことが可能となる。そこで、ヒューズカバー５０をケース１０から外して収容空間１２の開口部１２Ａを解放させ、その状態で、ヒューズ１１を外して新しいヒューズ１１を取り付ける。新しいヒューズ１１を取り付ける時は、リレーの開作動及び短絡プラグ３０の電極１４からの離脱によって回路が開いた状態となっているのでアークが発生する虞はない。そして、ヒューズ１１の交換が済んだ後は、ヒューズカバー５０を取り付けて収容空間１２の開口部１２Ａを塞ぎ、その後、上記と同様の手順で短絡プラグ３０を電極１４に差し込むとともに格納位置へ回動させ、回路を閉じる。
【００３１】
上述のように本実施形態においては、短絡プラグ３０が電極１４に差し込まれている状態では、係止手段である被ガイド部４０と軸受部５５との係止によりヒューズカバー５０が外れることが規制されているので、ヒューズ１１を外すことはできない。つまり、ヒューズ１１を外すためには、予め短絡プラグ３０を抜いてヒューズカバー５０を外せる状態にしておかなければならないので、短絡プラグ３０が差し込まれている状態のままでヒューズ１１が着脱されることが防止される。
【００３２】
また、短絡プラグ３０を電極１４に差し込む際には、被ガイド部４０をガイド溝１９，５６に沿わせることにより短絡プラグ３０が案内されるので、短絡プラグ３０の差込み操作を確実に行うことが出来る。しかも、短絡プラグ３０を回動変位させるためのガイド溝５６の奥端の軸受部５５と被ガイド部４０が、ヒューズカバー５０が不用意に外れることを防止するための係止手段を兼用しているので、専用の係止手段を別個に設ける場合に比べると、ヒューズカバー５０と短絡プラグ３０の形状の簡素化が実現されている。
【００３３】
また、短絡プラグ３０が電極１４に差し込まれている状態のままで、短絡プラグ３０を格納位置から操作位置へ向けて回動させ、リレーの開作動を開始させて、その開作動が完了することで回路を開いた状態にするようにしているが、かかる構成としたことにより、短絡プラグ３０を電極１４から抜き取る時点では既に回路がリレーの開作動によって開いた状態となるので、電極１４と短絡プラグ３０との間にアークが発生することが防止される。
【００３４】
また、差込み状態検知手段としてのガイド溝１９，５６と被ガイド部４０を設けたので、短絡プラグ３０の格納位置への回動の可否に基づいて、電極１４に対する短絡プラグ３０の差込み状態、ひいては、ヒューズカバー５０が外れ規制状態になっているか否かを検知することができる。
また、リレーの開作動が開始してからその開作動が完了して回路が閉じるまでの間にタイムラグがあるのであるが、リレーの開作動を開始させるために操作部３４を起こす操作から、その後の電極１４から短絡プラグ３０を抜き取るための上方へ持ち上げる操作へ移行するときには、変位操作用指掛け部３６からこれとは異なる位置に設けた抜取り用指掛け部３５に指を掛け替える必要がある。したがって、リレーの開作動が開始してから回路が閉じるまでの間にタイムラグがあっても、短絡プラグ３０の抜取り操作は、開作動が完了して回路が開いた後で行われるようになる。よって、回路が閉じた状態のままであるにも拘わらず電極１４間から短絡プラグ３０が抜き取られてしまう、ということはない。
【００３５】
しかも、変位操作用指掛け部３６に対する指の引っ掛け方向と、抜取り用指掛け部３５に対する指の引っ掛け方向とを互いに異なる方向としたので、変位操作用指掛け部３６から抜取り用指掛け部３５に指を掛け替える際のタイムラグ、ひいてはリレーの開作動が開始してから短絡プラグ３０が抜かれるまでの間のタイムラグを大きく確保することができる。
また、リレーを開閉作動させる変位動作検知手段は、簡素な形態である端子金具１６と短絡端子４２とによって構成されているので、マイクロスイッチ等の複雑な機器を用いるのに比べると、コストが低く抑えられている。
【００３６】
また、遊動規制手段としての弾性係止片２０によって操作部３４と短絡プラグ３０が格納位置に保持されるようになっているので、短絡プラグ３０が不用意に操作位置側へ遊動してリレーが開作動を行う、ということが防止されている。
また、非円形の被ガイド部４０と、短絡プラグ３０の回動中心となる軸受部１８，５５よりも幅の狭いガイド溝１９，５６とからなる抜取り規制手段を設けたことにより、短絡プラグ３０が格納位置にあって回路が閉じた状態であるにも拘わらず短絡プラグ３０が電極１４から抜き取られる、ということが確実に防止されている。
【００３７】
［他の実施形態］
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施態様も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）上記実施形態では短絡プラグを格納位置と操作位置との間で回動させるようにしたが、本発明によれば、短絡プラグを回動させない構成とすることもできる。
【００３８】
（２）上記実施形態では短絡プラグが格納位置と操作位置との間で回動操作されるようにしたが、本発明によれば、短絡プラグの変位形態は、回動に限らず、直線的な平行移動や、揺動変位等とすることもできる。
（３）上記実施形態では変位動作検知手段として端子金具とこの端子金具を短絡させる短絡端子とを用いたが、これに替えて、マイクロスイッチ等の他の手段を用いることもできる。
【００３９】
（４）上記実施形態では短絡プラグの格納位置と操作位置との間の変位角度を９０°としたが、本発明では、変位角度は９０°より小さい角度にしてもよく、９０°より大きい角度にしてもよい。
（５）上記実施形態ではスイッチング手段として励磁により開作動を開始するリレーを用いたが、本発明によれば、トランジスタなどの他の手段を用いることもできる。
（６）上記実施形態ではヒューズカバーのガイド溝の奥端の軸受部と短絡プラグの被ガイド部とを係止手段として兼用したが、本発明によれば、専用の係止手段を別個に設けてもよい。
【図面の簡単な説明】
【図１】実施形態１において短絡プラグを電極から抜いた状態をあらわす斜視図
【図２】短絡プラグを電極に差し込んだ状態をあらわす斜視図
【図３】短絡プラグを格納位置へ変位させた状態をあらわす斜視図
【図４】変位動作検知手段を構成する端子金具と短絡端子の斜視図
【図５】短絡プラグを電極に差し込んだ状態をあらわす平面図
【図６】短絡プラグを格納位置に変位させた状態をあらわす平面図
【図７】短絡プラグを電極に差し込んだ状態をあらわす横断面図
【図８】短絡プラグを格納位置へ変位させた状態をあらわす横断面図
【図９】短絡プラグを電極に差し込んだ状態をあらわす縦断面図
【図１０】変位動作検知手段の検知構造をあらわす断面図
【図１１】短絡プラグが操作位置にある状態をあらわす側面図
【図１２】短絡プラグが格納位置にある状態をあらわす側面図
【図１３】短絡プラグの差込みが不正である状態をあらわす側面図
【図１４】ケースからヒューズカバーを外した状態をあらわす一部切欠斜視図
【符号の説明】
Ａ…ブレーカ装置
１０…ケース
１１…ヒューズ
１２…収容空間
１２Ａ…収容空間の開口部
１４…電極
１６…端子金具（変位動作検知手段）
１９…ガイド溝（差込み状態検知手段）
２１…指掛け規制部（指掛け規制手段）
２２…切欠部（指掛け規制手段）
３０…短絡プラグ
３５…抜取り用指掛け部
３６…変位操作用指掛け部
４０…被ガイド部（係止手段、差込み状態検知手段）
４２…短絡端子（変位動作検知手段）
５０…ヒューズカバー
５５…軸受部（係止手段）
５６…ガイド溝（差込み状態検知手段）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a breaker device including a detachable fuse and a detachable shorting plug.
[0002]
[Prior art]
As a breaker device, there is one in which a detachable fuse and a pair of electrodes that are short-circuited by inserting a short-circuit plug and released from short-circuit by removing the short-circuit plug are provided in series.
Normally, the circuit is closed by inserting a short-circuit plug into the electrode with the fuse attached. When the circuit is opened for circuit maintenance or the like, the short circuit between the electrodes is released by removing the shorting plug from the electrodes while the fuse is attached.
[0003]
When replacing the fuse, the short-circuit plug is removed from the electrode in advance to open the circuit, and in that state, the fuse is removed and a new fuse is attached. Then, after the replacement of the fuse is completed, the short-circuit plug is inserted into the electrode to close the circuit.
[0004]
[Problems to be solved by the invention]
In the breaker device as described above, if the fuse is replaced while the short-circuit plug is inserted into the electrode, there is a risk that when a new fuse is installed, the circuit is closed simultaneously with the installation and the arc is blown. Therefore, a means for preventing the fuse from being attached or detached when the shorting plug is inserted is desired.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to prevent a fuse from being attached or detached while a short-circuit plug is inserted.
[0006]
[Means for Solving the Problems]
The invention of claim 1 is provided with a detachable fuse and a pair of electrodes which are short-circuited by insertion of a short-circuit plug and released from short-circuit by removal of the short-circuit plug, and the electrodes are fixed. ing In addition, the shorting plug can be attached and detached. A case, a housing space formed in the case, in which the fuse is accommodated, and an opening in the housing space, and the fuse in the housing space is attached to the opening. A fuse cover that regulates removal, and the shorting plug and the fuse cover; Attached to the cover In a state where the fuse cover is inserted into the electrode and is attached to the opening of the housing space, the fuse cover is prevented from coming off by being locked together, and the short-circuit plug is Removed from the cover Locking means is provided to allow the fuse cover to be removed when the electrode is removed from the electrode. The shorting plug attached to the case is maintained in contact with the pair of electrodes, and the operation position in which the shorting plug is allowed to be attached to and detached from the case, and the shorting plug from the case. It is possible to rotate between the storage position where release is restricted. It was set as the structure.
[0007]
According to a second aspect of the present invention, in the first aspect of the invention, the fuse cover is formed with a guide groove parallel to the insertion direction of the short-circuit plug with respect to the electrode in a state of being attached to the opening of the accommodation space. In addition, the short-circuit plug is formed with a protruding guided portion that is movable along the guide groove, and the inner end of the guide groove serves as a locking means on the fuse cover side, and the guided portion Is configured as locking means on the short-circuit plug side.
[0008]
According to a third aspect of the present invention, in the invention of the second aspect, the inner end of the guide groove is a bearing portion, and the guided portion is capable of rotating in the bearing portion, and the electrode And the fuse is connected to a circuit that is opened and closed by an opening and closing operation of the switching means, and the short-circuit plug inserted into the electrode is rotated to the retracted position around the guided portion in the bearing portion. Detecting and closing the switching means, and detecting the rotation of the short-circuit plug in the process of rotating from the retracted position to the operating position, and causing the switching means to start the opening operation. The configuration is provided.
[0009]
According to a fourth aspect of the present invention, in the third aspect of the invention, when the shorting plug is properly inserted into the electrode and the guided portion is locked to the bearing portion, the shorting plug is retracted from the operation position. Displacement to the position side is allowed, but when the shorting plug is in an improper insertion state, there is provided an insertion state detecting means for restricting displacement of the shorting plug to the storage position side due to interference with the shorting plug. did.
According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the displacement operation finger-hanging portion provided on the short-circuit plug for rotating the short-circuit plug from the storage position to the operation position, and the short-circuit plug Provided in a position different from the displacement operation finger-hanging portion, and when the short-circuit plug is in the retracted position, a finger-holding portion for removing the short-circuit plug from the electrode, Finger hooking restricting means that allows a hooking operation but restricts a finger hooking operation to the extraction finger hooking portion and allows a finger hooking operation to the extraction finger hooking portion when the shorting plug is displaced to an operation position. It was set as the structure equipped with.
[0010]
[Action and effect of the invention]
[Invention of Claim 1]
When the short-circuit plug is inserted into the electrode, the fuse cover is restricted from being removed by the locking means, so the fuse cannot be removed. In order to remove the fuse, it is necessary to remove the short-circuit plug in advance so that the fuse cover can be removed. Therefore, it is possible to prevent the fuse from being attached or detached while the short-circuit plug is inserted.
[0011]
[Invention of claim 2]
When the shorting plug is inserted into the electrode, the shorting plug is guided by bringing the guided portion along the guide groove, so that the operation of inserting the shorting plug can be performed reliably. Moreover, since the back end of the guide groove and the guided portion also serve as locking means, the shapes of the fuse cover and the short-circuit plug can be simplified as compared with the case where a dedicated locking means is provided separately. it can.
[Invention of claim 3]
The circuit is closed when the short-circuit plug is inserted into the electrode and rotated to the retracted position. From this state, when the short-circuit plug is rotated from the retracted position toward the operation position, the switching means starts to open during the rotation, and when the opening operation is completed, the main circuit is opened. Thereafter, when the short-circuit plug is removed from the electrode, the energization between the electrode pair is blocked, but at this time, the main circuit is already opened by the opening operation of the switching means, so an arc is formed between the electrode and the short-circuit plug. Will not occur.
[0012]
[Invention of claim 4]
By providing the insertion state detection means, it is detected whether the shorting plug is inserted into the electrode, and consequently whether the fuse cover is in a restricted state based on whether the shorting plug can be rotated to the storage position. be able to.
[Invention of claim 5]
When shifting from the turning operation of the shorting plug for opening the switching means to the operation for removing the shorting plug from the subsequent electrode, it is necessary to change the finger to a different finger-hanging part, so the opening operation of the switching means starts. Even if there is a time lag between when the opening operation is completed and when the main circuit is closed, the operation for removing the shorting plug is performed after the opening operation is completed and the main circuit is opened. Therefore, the short-circuit plug is not pulled out from the electrode even though the main circuit remains closed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
A first embodiment embodying the present invention will be described below with reference to FIGS. The breaker device A according to the first embodiment is provided with a fuse 11 and a pair of electrodes 14 in series in a circuit (not shown) that is opened and closed by an opening and closing operation of a relay (a switching means that is a constituent of the present invention). By inserting / removing the short-circuit plug 30 to / from 14, the energization between the electrodes 14 can be allowed or blocked independently of the opening / closing operation of the relay. In the following description, for the front-rear direction, the diagonally upper right in FIG. 1 is the front, and for the left-right direction, the diagonally lower right in FIG. 1 is the right.
[0014]
The case 10 having an open upper surface includes a rectangular accommodating space 12 that is long in the front-rear direction in which the fuse 11 is accommodated, and a rectangular storage space 13 that is long in the left-right direction and communicates with the front end of the accommodating space 12.
The accommodation space 12 is an opening 12A whose upper surface is opened in a square shape throughout, and communicates with the storage space 13 at the front end. A retaining protrusion 12 B is formed on the rear outer surface of the peripheral wall constituting the housing space 12. A pair of front and rear bolts 12C are erected in the accommodation space 12, and the fuse 11 is fixed by nuts 12D with both front and rear ends fitted to the bolts 12C. Further, the fuse 11 can be removed by removing the nut 12D from the bolt 12C.
[0015]
A fuse cover 50 is attached to the case 10 so as to cover the entire opening 12A of the housing space 12. The fuse cover 50 includes a top plate 51 that closes the opening 12 A, a substantially U-shaped guide wall 52 that fits to the outer surfaces of the left and right walls and the rear wall of the storage space 12, and communication between the storage space 12 and the storage space 13. And a front wall 53 for closing the part. Further, a retaining hole 54 that engages with the retaining projection 12B is formed in the rear surface portion of the guide wall 52.
[0016]
The fuse cover 50 is attached so that the guide wall 52 is fitted on the peripheral wall of the accommodation space 12 and the front wall 53 is fitted in the communication portion between the accommodation space 12 and the storage space 13. In this state, the fuse cover 50 is restricted from being removed from the case 10 at the rear end portion by the locking of the retaining hole 54 and the retaining protrusion 12B, but can be lifted upward at the front end portion. It has become. However, in the state where the shorting plug 30 is inserted into the electrode 14 as will be described later, the fuse cover 50 is restricted from moving upward at the front end portion of the fuse cover 50, so that the fuse cover 50 is in a state where the fuse cover 50 is separated from the case 10. Attached to. Further, in the state where the short-circuit plug 30 is removed, the fuse cover 50 can be detached upward from the case 10 while removing the retaining hole 54 from the retaining protrusion 12B.
[0017]
On the front wall 53 of the fuse cover 50, a bearing portion 55 having a circular hole shape (locking means that is a constituent element of the present invention) and a width narrower than the inner diameter of the bearing portion 55 are formed from the upper end of the bearing portion 55. A guide groove 56 (insertion state detection means which is a constituent element of the present invention) is formed in the vertical direction (direction parallel to the insertion / removal direction of the short-circuit plug 30 with respect to the electrode 14) communicating with the upper end edge of the front wall 53.
In the storage space 13, a pair of electrodes 14 having an elongated plate shape in the vertical direction are fixed along the front and rear side surfaces of the support column 15. Of the pair of electrodes 14, the rear electrode 14 is fixed to the bolt 12 C in the accommodating space 12 by fastening together with the front end portion of the fuse 11, so that the fuse 11 and the electrode 14 are connected in series. ing. Further, a pair of front and rear terminal fittings 16 (displacement operation detecting means which is a constituent element of the present invention) are fixed upward at a position to the right of both electrodes 14 in the storage space 13. The pair of terminal fittings 16 constitute a relay, and the short-circuit terminals 42 (displacement operation detecting means which is a constituent element of the present invention) of the short-circuit plug 30 are fitted to the both terminal fittings 16 from above. When both terminal fittings 16 are short-circuited and the short-circuit terminal 42 is removed from both terminal fittings 16, the short-circuiting of both terminal fittings 16 is released and the circuit is opened.
[0018]
The front wall 17F of the peripheral wall constituting the storage space 13 communicates with the circular hole-shaped bearing portion 18 and the inner diameter of the bearing portion 18 from the upper end of the bearing portion 18 to the upper edge of the front wall 17F. Guide grooves 19 (insertion state detecting means which is a constituent element of the present invention) are formed in the vertical direction (direction parallel to the insertion / removal direction of the short-circuit plug 30 with respect to the electrode 14). The bearing portion 18 and the guide groove 19 have the same dimensions and the same vertical and horizontal positions as the bearing portion 55 and the guide groove 56 of the fuse cover 50. Further, a pair of front and rear elastic locking pieces 20 that rise from an intermediate height between the front and rear walls 17F and 17R of the storage space 13 and have an inward claw at the upper end are positioned to the right of the bearing portion 18 in the storage space 13. Is formed along the front wall 17F and the rear wall 17R.
[0019]
In addition, the substantially right half area of the front wall 17F and the rear wall 17R of the storage space 13 is a finger hook restricting portion 21 that restricts a finger hooking operation with respect to the extraction finger hook portion 35 in a state where the operation portion 34 is in the retracted position. It is a finger-holding restricting means which is a constituent requirement of the present invention. Further, the right wall 17S of the storage space 13 has a notch 22 (a finger hook which is a constituent element of the present invention) that allows a finger hooking operation to the displacement operation finger hook 36 in a state where the operation portion 34 is in the storage position. Regulatory means) is formed.
[0020]
The short-circuit plug 30 includes a plug body 31 made of an insulating resin material, a short-circuit member 41 formed by bending a metal plate, and a short-circuit terminal 42 formed by bending the metal plate. The plug body 31 will be described. A pair of front and rear rectangular protective plate portions 33 are extended from both front and rear edges of the substrate portion 32, and a short-circuit member 41 is accommodated between the pair of protective plate portions 33. Yes. The short-circuit member 41 has a configuration in which a pair of front and rear elastic contact pieces 41B having a substantially S shape are extended from both ends of the arc-shaped connecting portion 41A along the inner surface of the protection plate portion 33.
[0021]
An operation portion 34 that protrudes on the opposite side of the protection plate portion 33 is formed on the substrate portion 32 so that it can be integrally displaced. The operation unit 34 includes an extraction finger hook 35 and a displacement operation finger hook 36. The extraction finger-hanging portion 35 is in a form of being passed in parallel with the substrate portion 32 between the rising ends of a pair of rising portions 37 rising from both ends of the substrate portion 32 to the side opposite to the protective plate portion 33. The extraction finger-hanging portion 35 is sized so that, for example, two or three fingers can be hooked at the same time from the front or rear of the extraction finger-hanging portion 35. Can be firmly grasped. Further, the displacement operation finger-hanging portion 36 is configured to protrude from one end of the extraction finger-hanging portion 35 to the opposite side (outside) of the substrate portion 32, and the displacement operation finger-hanging portion 36 includes the extraction finger-hanging portion 36. Only the fingertip of one finger can be hooked from a direction orthogonal to the finger hooking direction with respect to 35 (a direction parallel to the length direction of the extraction finger hooking portion 35).
[0022]
The plug main body 31 has an accommodating portion 38 so as to be positioned at the base end portion of the rising portion 37 on one side of the extraction finger hanging portion 35 (the side opposite to the side on which the displacement operation finger hanging portion 36 is formed). Is formed. The accommodating portion 38 is opened toward the outer surface side of the rising portion 37, and the short-circuit terminal 42 constituting the displacement operation detecting means is accommodated in the accommodating portion 38. The short-circuit terminal 42 is obtained by extending a pair of front and rear plate-like contact portions 42 B from a plate-like connection portion 42 A, and the pair of contact portions 42 B provided on the case 10. Plugged into. Furthermore, a locked portion 39 to which the elastic locking piece 20 is locked is formed on the side edge of the other rising portion 37 in the extraction finger hook portion 35.
[0023]
In addition, a pair of front and rear guided portions 40 (an engaging means and an insertion state detecting means which are constituent elements of the present invention) are formed to project from the outer surfaces of the pair of protective plate portions 33. The outer periphery of the guided portion 40 has a pair of flat portions 32F in a direction orthogonal to the substrate portion 32 (a direction in which the shorting plug 30 is inserted into and removed from the electrode 14), and a pair of arc portions 32S that connect both ends of the flat portions 32F. It consists of and. The distance between the pair of flat portions 32F is the same as or slightly smaller than the width of the guide grooves 19 and 56, and the maximum distance between the pair of arc portions 32S is the guide groove 19. , 56 is set to a size larger than the width of the guide groove 40, and the guide portion 40 cannot be rotated inside the guide grooves 19, 56 by this size setting. Further, the pair of arc portions 32S are formed along a common virtual circle (not shown), and the diameter of the common virtual circle is the same as or slightly smaller than the inner diameter of the bearing portions 18 and 55. The guide portion 40 can be rotated in the bearing portions 18 and 55 due to the small size.
[0024]
Next, the operation of this embodiment will be described.
When assembling, first, the fuse 11 is attached in the accommodating space 12 and the opening 12 A of the accommodating space 12 is covered with the fuse cover 50. In this state, the opening 12A of the accommodation space 12 is blocked, so that the fuse 11 cannot be replaced. From this state, as shown in FIG. 1, the position of the short-circuit plug 30 above the case 10 is such that the displacement operation finger hook portion 36 faces upward (the flat portion 40F of the guided portion 40 faces up and down). The both guided portions 40 are fitted into the guide grooves 19 and 56 as they are, and the short-circuit plug 30 is inserted over the electrode 14 from above while being guided by the guide grooves 19 and 56. At this time, the short-circuit plug 30 is in the operating position, and as shown in FIG. 9, the elastic contact portion 41 B of the short-circuit member 41 comes into contact with both electrodes 14 so that the electrodes 14 can conduct. However, at this time, the circuit is not yet in a closed state (a state in which power can be supplied). In addition, in a state where the shorting plug 30 is properly inserted, the guided portion 40 comes into contact with the inner periphery of the bearing portion 55 formed at the front end portion of the fuse cover 50 so as to be pressed from above. The cooperation of the retaining protrusion 12B and the retaining action of the retaining hole 54 restricts the fuse cover 50 from being removed from the case 10.
[0025]
Thereafter, when the operating portion 34 is pushed with a finger and the shorted plug 30 is rotated 90 ° so as to tilt to the right while rotating the guided portion 40 in the bearing portions 18 and 55, the shorted plug 30 is in the retracted position ( (See FIGS. 3, 6, 8, and 12). While the short-circuit plug 30 is displaced from the operation position to the retracted position, the short-circuit member 41 maintains a state of being in contact with the electrode 14 (a state in which the electrode 14 can be conducted).
When the short-circuit plug 30 is not properly inserted, the guided portion 40 does not reach the bearing portions 18 and 55 and remains in the guide grooves 19 and 56 as shown in FIG. The guided portion 40 cannot rotate in the guide grooves 19 and 56. Therefore, in this unauthorized insertion state, the short-circuit plug 30 cannot be rotated to the storage position. Further, since the guided portion 40 is not in contact with the bearing portion 55 of the fuse cover 50, the fuse cover 50 can be removed from the case 10. Therefore, in this case, it is necessary to perform an operation of inserting the short-circuit plug 30 again until the short-circuit plug 30 is brought into a normal insertion state.
[0026]
In a state where the shorting plug 30 is displaced to the retracted position, the shorting terminal 42 short-circuits the pair of terminal fittings 16, thereby detecting that the shorting plug 30 has been displaced to the retracted position, and the relay is closed, The circuit is closed. Further, in this stored state, the elastic locking piece 20 elastically locks against the locked portion 39 of the operation portion 34, so that the operation portion 34 is restrained from moving toward the operation position and stored. Held in position. Furthermore, in the bearing portions 18 and 55, the guided portion 40 is oriented so that the flat portion 40F is orthogonal to the guide grooves 19 and 56. In this state, as shown in FIG. Since it is not possible to enter the guide grooves 19 and 56 having a narrower width than the bearing portions 18 and 55, the upward displacement of the short-circuit plug 30, that is, the displacement in the direction of extraction from the electrode 14 is restricted, and as a result The upward detachment of the cover 50 from the case 10 is restricted.
[0027]
Next, the procedure for opening the circuit and replacing the fuse 11 from the state in which the short-circuit plug 30 is stored in the case 10 and the circuit is closed will be described.
In the retracted state, as shown in FIG. 3, the extraction finger hook 35 is completely accommodated between the front and rear walls 17F, 17R of the storage space 13 and the finger hook restricting portion 21. Cannot be plugged in. On the other hand, the displacement operation finger-hanging portion 36 protrudes from the notch 22 of the right wall 17S to the outside, and is in a state in which the finger can be hooked.
[0028]
Therefore, by first hooking the fingertip on the displacement operation finger-hanging portion 36 and applying an upward operation force exceeding the locking force between the elastic locking piece 20 and the locked portion 39 to the operation portion 34, The short-circuit plug 30 is displaced upward. At this time, since the guided portion 40 only rotates within the bearing portions 18 and 55 and is not displaced into the guide grooves 19 and 56, the short-circuit plug 30 is connected to the guided portion 40 (bearing portions 18 and 55). Rotate around the center. When the rotational displacement of the short-circuit plug 30 is started, immediately after the start of the short-circuit plug 30 (before the short-circuit plug 30 reaches the operation position), the short-circuit terminal 42 is separated from the pair of terminal fittings 16, and the short-circuiting of both the terminal fittings 16 occurs. It is detected that the short-circuit plug 30 has started to be displaced toward the operation position. By this detection, the relay is excited and an opening operation for opening the circuit is started, but there is a time lag from the start of the opening operation to completion, and the circuit opens when the opening operation is completed. At this time, the electrode 14 is kept in a conductive state by the short-circuit member 41.
[0029]
Thereafter, when the rotation operation of the short-circuit plug 30 is further continued, the short-circuit plug 30 reaches the operation position, and the guided portion 40 in the bearing portions 18 and 55 can move to the guide grooves 19 and 56. The extraction finger hook 35 is exposed upward from the storage space 13 so that the finger can be hooked. Therefore, the finger hooked on the displacement operation finger hook 36 is released, the finger is hooked on the extraction finger hook 35, and the operation portion 34 is gripped. In this state, since the short-circuit plug 30 is still inserted into the electrode 14, removal of the fuse cover 50 from the case 10 is restricted.
[0030]
If the operation part 34 is lifted in this state, the short-circuit plug 30 is extracted from the electrode 14, so that the electrode 14 cannot be connected. When the short-circuit plug 30 is removed from the electrode 14, the circuit has already been opened by the relay opening operation, so that no arc is generated between the electrode 14 and the short-circuit member 41.
Further, when the short-circuit plug 30 is removed, the bearing portion 55 is released from the contact by the guided portion 40 at the front end portion of the fuse cover 50, so that the fuse cover 50 can be removed upward from the case 10. Therefore, the fuse cover 50 is removed from the case 10 to release the opening 12A of the accommodation space 12, and in this state, the fuse 11 is removed and a new fuse 11 is attached. When the new fuse 11 is installed, there is no possibility of arcing because the circuit is open due to the relay opening operation and the disconnection of the shorting plug 30 from the electrode 14. After the replacement of the fuse 11, the fuse cover 50 is attached to close the opening 12A of the accommodation space 12, and then the shorting plug 30 is inserted into the electrode 14 and rotated to the storage position in the same procedure as described above. And close the circuit.
[0031]
As described above, in the present embodiment, in a state where the shorting plug 30 is inserted into the electrode 14, the fuse cover 50 is prevented from being removed due to the engagement between the guided portion 40 and the bearing portion 55, which are locking means. Therefore, the fuse 11 cannot be removed. That is, in order to remove the fuse 11, it is necessary to remove the short-circuit plug 30 in advance so that the fuse cover 50 can be removed. Therefore, the fuse 11 can be attached and detached while the short-circuit plug 30 is inserted. Is prevented.
[0032]
Further, when the shorting plug 30 is inserted into the electrode 14, the shorting plug 30 is guided by placing the guided portion 40 along the guide grooves 19 and 56, so that the insertion operation of the shorting plug 30 can be performed reliably. I can do it. Moreover, the bearing portion 55 and the guided portion 40 at the back end of the guide groove 56 for rotationally displacing the short-circuit plug 30 also serve as a locking means for preventing the fuse cover 50 from being inadvertently removed. Therefore, as compared with the case where a dedicated locking means is provided separately, the shapes of the fuse cover 50 and the short-circuit plug 30 are simplified.
[0033]
Further, with the shorting plug 30 inserted into the electrode 14, the shorting plug 30 is rotated from the storage position toward the operation position, and the opening operation of the relay is started to complete the opening operation. However, since the circuit is already opened by opening the relay when the short-circuit plug 30 is removed from the electrode 14 due to such a configuration, the circuit is short-circuited with the electrode 14. Arcing between the plug 30 and the plug 30 is prevented.
[0034]
Further, since the guide grooves 19 and 56 as the insertion state detecting means and the guided portion 40 are provided, the insertion state of the short-circuit plug 30 with respect to the electrode 14, and consequently, based on whether or not the short-circuit plug 30 can be rotated to the storage position. It is possible to detect whether or not the fuse cover 50 is removed and is in a restricted state.
In addition, there is a time lag between the start of the opening operation of the relay and the completion of the opening operation until the circuit is closed. After the operation of raising the operation unit 34 to start the opening operation of the relay, When shifting to an upward lifting operation for extracting the short-circuit plug 30 from the electrode 14, it is necessary to change the finger from the displacement operation finger hook portion 36 to the extraction finger hook portion 35 provided at a different position. Therefore, even if there is a time lag between when the relay opening operation is started and when the circuit is closed, the extraction operation of the shorting plug 30 is performed after the opening operation is completed and the circuit is opened. Therefore, the shorting plug 30 is not pulled out between the electrodes 14 even though the circuit is kept closed.
[0035]
In addition, since the finger hooking direction with respect to the displacement operation finger hanging portion 36 and the finger hooking direction with respect to the extraction finger hanging portion 35 are different from each other, the finger is hooked from the displacement operation finger hanging portion 36 to the extraction finger hanging portion 35. It is possible to secure a large time lag when switching, and thus a time lag from when the relay opening operation is started until the short-circuit plug 30 is removed.
Further, since the displacement operation detecting means for opening and closing the relay is constituted by the terminal fitting 16 and the short-circuit terminal 42 which are simple forms, the cost is low compared to using a complicated device such as a micro switch. It is suppressed.
[0036]
Further, since the operation portion 34 and the shorting plug 30 are held in the retracted position by the elastic locking piece 20 as the play restricting means, the shorting plug 30 is inadvertently moved to the operating position side and the relay is operated. The opening operation is prevented.
Further, the short-circuit plug 30 includes the non-circular guided portion 40 and the extraction restriction means including the guide grooves 19 and 56 that are narrower than the bearing portions 18 and 55 that serve as the rotation center of the short-circuit plug 30. Is reliably prevented from being pulled out of the electrode 14 even though the circuit is closed and the circuit is closed.
[0037]
[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the shorting plug is rotated between the storage position and the operation position. However, according to the present invention, the shorting plug may not be rotated.
[0038]
(2) In the above embodiment, the short-circuit plug is rotated between the retracted position and the operation position. However, according to the present invention, the displacement form of the short-circuit plug is not limited to rotation but is linear. It can also be a parallel translation, a rocking displacement or the like.
(3) In the above-described embodiment, the terminal fitting and the short-circuited terminal for short-circuiting the terminal fitting are used as the displacement operation detecting means, but other means such as a microswitch can be used instead.
[0039]
(4) In the above-described embodiment, the displacement angle between the retracted position of the shorting plug and the operation position is 90 °. However, in the present invention, the displacement angle may be an angle smaller than 90 ° or an angle larger than 90 °. It may be.
(5) In the above embodiment, the relay that starts the opening operation by excitation is used as the switching means. However, according to the present invention, other means such as a transistor can be used.
(6) In the above embodiment, the bearing portion at the back end of the guide groove of the fuse cover and the guided portion of the shorting plug are used as the locking means. However, according to the present invention, the dedicated locking means is provided separately. May be.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a short-circuit plug is removed from an electrode in Embodiment 1. FIG.
FIG. 2 is a perspective view showing a state in which a short-circuit plug is inserted into an electrode.
FIG. 3 is a perspective view showing a state in which the short-circuit plug is displaced to the retracted position.
FIG. 4 is a perspective view of a terminal fitting and a short-circuiting terminal constituting a displacement operation detecting means.
FIG. 5 is a plan view showing a state in which a short-circuit plug is inserted into an electrode.
FIG. 6 is a plan view showing a state in which the short-circuit plug is displaced to the storage position.
FIG. 7 is a cross-sectional view showing a state where a shorting plug is inserted into an electrode.
FIG. 8 is a cross-sectional view showing a state in which the short-circuit plug is displaced to the storage position.
FIG. 9 is a longitudinal sectional view showing a state in which the shorting plug is inserted into the electrode.
FIG. 10 is a cross-sectional view showing a detection structure of a displacement motion detection means.
FIG. 11 is a side view showing a state in which the short-circuit plug is in the operating position.
FIG. 12 is a side view showing a state in which the shorting plug is in the retracted position.
FIG. 13 is a side view showing a state where the insertion of the shorting plug is incorrect.
FIG. 14 is a partially cutaway perspective view showing the fuse cover removed from the case.
[Explanation of symbols]
A ... Breaker device
10 ... Case
11 ... Fuse
12 ... Containment space
12A ... Opening of accommodation space
14 ... Electrode
16. Terminal fitting (displacement motion detection means)
19 ... Guide groove (insertion state detection means)
21 ... Finger-hanging restriction part (finger-hanging restriction means)
22 ... Notch (finger hook restricting means)
30 ... Short-circuit plug
35 ... Extraction finger hook
36: Displacement operation finger rest
40: Guided portion (locking means, insertion state detecting means)
42 ... Short-circuit terminal (displacement motion detection means)
50 ... Fuse cover
55. Bearing portion (locking means)
56 ... Guide groove (insertion state detection means)

Claims

A detachable fuse and a pair of electrodes that are short-circuited by insertion of a short-circuit plug and released from short-circuit by extraction of the short-circuit plug are provided in series,
A case in which the electrode is fixed and the shorting plug can be attached and detached ;
A housing space formed in the case and housing the fuse;
A fuse cover that is detachable with respect to the opening of the housing space, and restricts removal of the fuse in the housing space in a state of being attached to the opening;
Provided in the short-circuit plug and the fuse cover, the short-circuit plug is attached to the case and inserted into the electrode, and the fuse cover is locked to each other in a state of being attached to the opening of the accommodation space. In the state where the fuse cover is prevented from being removed , and the shorting plug is removed from the case and removed from the electrode, a locking means is provided to allow the fuse cover to be removed .
The shorting plug attached to the case maintains the contact state with the pair of electrodes, the operation position where the shorting plug is allowed to be attached to and detached from the case, and the shorting plug is detached from the case. A breaker device characterized by being capable of rotating between a regulated storage position .

The fuse cover is formed with a guide groove parallel to the insertion direction of the shorting plug with respect to the electrode in a state of being attached to the opening of the accommodating space.
The short-circuit plug is formed with a protruding guided portion movable along the guide groove,
The back end of the guide groove is a locking means on the fuse cover side,
The breaker device according to claim 1, wherein the guided portion is a locking means on the short-circuit plug side.

The inner end of the guide groove is a bearing portion, and the guided portion is capable of rotating within the bearing portion,
The electrode and the fuse are connected to a circuit that is opened and closed by an opening and closing operation of a switching means;
The short-circuit plug inserted into the electrode detects that the short-circuit plug in the bearing portion has pivoted to the retracted position around the guided portion, and closes the switching means. The breaker device according to claim 2, further comprising a displacement operation detecting means for detecting the rotation in a process of rotating to the operation position side and causing the switching means to start an opening operation.

In a state where the shorting plug is properly inserted into the electrode and the guided portion is locked to the bearing portion, the shorting plug is allowed to be displaced from the operation position to the storage position side. 4. The breaker device according to claim 3, further comprising insertion state detecting means for restricting displacement of the shorting plug toward the storage position due to interference with the shorting plug when in an illegal insertion state.

Displacement operation finger-hanging portion provided on the short-circuit plug, for displacing the short-circuit plug from the storage position to the operation position;
A pull-off finger hook for pulling out the short plug from the electrode, provided at a position different from the displacement hook of the short plug;
In the state where the shorting plug is in the retracted position, a finger hooking operation with respect to the displacement operation finger hanging portion is allowed, but the finger hooking operation to the extraction finger hanging portion is restricted, and the short plug is displaced to the operation position The breaker device according to claim 3 or 4, further comprising finger hooking restriction means that allows a finger hooking operation to the extraction finger hook portion in a state.