JP3674497B2 - Terminal equipment - Google Patents

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Publication number
JP3674497B2
JP3674497B2 JP2000348763A JP2000348763A JP3674497B2 JP 3674497 B2 JP3674497 B2 JP 3674497B2 JP 2000348763 A JP2000348763 A JP 2000348763A JP 2000348763 A JP2000348763 A JP 2000348763A JP 3674497 B2 JP3674497 B2 JP 3674497B2
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Japan
Prior art keywords
electric wire
contact
wire
terminal plate
terminal
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Expired - Fee Related
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JP2000348763A
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Japanese (ja)
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JP2002151171A (en
Inventor
克哉 今井
直樹 金本
正浩 忽那
安弘 住野
博之 立石
辰也 高木
健 鈴木
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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、スイッチ、コンセント、照明器具などの電気器具の器体に収納され電線を接続する端子装置に関するものである。
【0002】
【従来の技術】
従来から、スイッチやコンセントのような配線器具あるいは照明器具などにおいて、器体に設けた電線挿入孔を通して器体に導入された電線を接続するために速結端子と称する端子装置が広く用いられている。この種の端子装置は、器体に収納され電線挿入孔を通して器体に導入された電線に接触する図13に示すような形状の端子板3と、端子板3との間で電線を挟持する鎖錠ばねとを備える構造のものが多い。鎖錠ばねは板ばねであって、鎖錠ばねに設けた鎖錠片の端縁と端子板3との間に電線を挟持することによって電線を保持するように形成されている。つまり、器体に設けた電線挿入孔を通して電線を器体に導入すると、電線が鎖錠片を端子板3から引き離す向きに撓ませ、このことによって鎖錠片に生じるばね力によって電線が端子板3と鎖錠片との間に挟持されるように構成されている。ここに、電線が端子板3と鎖錠片との間に挟持された状態では鎖錠片の端縁が電線に弾接し電線の一部に鎖錠片が食い込むことによって電線の抜け止めがなされる。このように、電線を電線挿入孔に挿入するだけで端子板3に電線が接触した状態で保持されるから、端子ねじを用いて電線を接続する端子装置に比較すると電線の結線作業が容易になる。
【0003】
【発明が解決しようとする課題】
ところで、従来から知られているこの種の端子装置の多くは、芯線が単線である電線を接続することを想定しており、芯線が撚り線である場合には鎖錠片による抜け止めの効果を充分に得ることができないという問題を有している。つまり、図13に示す端子板3のように電線との接触部位である主片3aが平板である端子板3を用いると、芯線が撚り線であると端子板3と鎖錠片との間に導入したときに撚り線を構成する各線がばらばらに広がるから、鎖錠ばねと端子板との距離が小さくなって鎖錠ばねによる充分な接触圧を得ることができないことになる。この問題を解決するには、鎖錠片のばね定数を大きくすることが考えられるが、鎖錠片のばね定数が大きくなると端子板3と鎖錠片との間に電線を導入するのに要する力が大きくなり、結果的に端子板と鎖錠片との間に電線を挿入しようとしても鎖錠片が撓まず、電線を保持させることができないことになる。このような事情から、芯線が撚り線である電線を用いる場合には、撚り線がばらばらになるのを防止するために電線の末端部分に別部材を取り付けたり電線の末端部分を半田で固めたりしており、結線作業が容易になるという速結端子の長所が失われているのが現状である。
【0004】
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、芯線が撚り線である電線であっても電線の末端部分に何らの加工を施すことなく、器体に設けた電線挿入孔を通して電線を導入するだけで電線を接続することができる端子装置を提供することにある。
【0005】
【課題を解決するための手段】
請求項1の発明は、電気器具の器体に貫設した電線挿入孔を通して器体に導入された電線に接触する端子板と、端子板に向かってばね付勢され端縁を前記電線に弾接させることにより端子板との間で前記電線を挟持する鎖錠片を有した鎖錠ばねとを備え、端子板において前記電線を接触させる面には、前記電線の挿入方向に交わる方向において、中央部に導入された前記電線を鎖錠片との間に挟持する部位の両側であって、電線挿入孔から芯線が撚り線である電線を導入して当該電線がばらばらに広がった場合に当該電線を鎖錠片との間に挟持する部位に一対の案内突部が突設されているものである。
【0006】
請求項2の発明は、請求項1の発明において、前記案内突部において少なくとも互いに近い側の端部が球面状に形成されているものである。
【0007】
請求項3の発明は、請求項1の発明において、前記案内突部が前記鎖錠片の端縁の一部に対向する位置に形成されているものである。
【0008】
請求項4の発明は、請求項1の発明において、一対の前記案内突部が前記電線の先端側に向かって互いの距離を小さくする形で配置されているものである。
【0009】
請求項5の発明は、請求項1の発明において、前記端子板において前記電線との接触部位には電線の導入方向おいて凹凸が交互に繰り返すローレット部が形成されているものである。
【0010】
請求項6の発明は、請求項1の発明において、前記端子板において前記電線を接触させる面には前記鎖錠片の側縁に沿ってガード片が突設されているものである。
【0012】
【発明の実施の形態】
以下に説明する実施の形態では、本発明の端子装置をスイッチに適用した例を示すが、他の電気機器において同様の構成を適用するのを妨げるものではない。
【0013】
まず、端子装置を適用するスイッチについて説明する。図7ないし図9に示すスイッチは、前面(図7の上面)が開口した直方体状の合成樹脂成形品のボディ10と、矩形枠状に形成されボディ10の前面側に結合される合成樹脂成形品のカバー20とにより構成される器体1を備える。ボディ10の幅方向における両外側面にはボディ10の長手方向に離間して各一対の組立突起11が突設され、カバー20の後端縁からは組立舌片21が後方に延設され、組立舌片21に設けた組立孔21aに組立突起11が係合することによってボディ10とカバー20とが結合される。
【0014】
ボディ10には、ボディ10の後壁に設けた電線挿入孔12を通して器体1に挿入される電線2(図3参照)を接続する2個の端子装置30a,30bと、端子装置30a,30bの間の電路を開閉する接点装置40とが収納される。一方、カバー20の中央部の開口窓22には合成樹脂成形品の反転ハンドル50がカバー20に対して揺動自在に枢支された形で装着され、この反転ハンドル50の揺動に伴って接点装置40が開閉される。反転ハンドル50の前面側にはカバー20の前面に重複する合成樹脂成形品の操作ハンドル60が着脱可能に結合され、操作ハンドル60を操作部として揺動させることにより、反転ハンドル50が揺動して接点装置40が開閉されるようにしてある。
【0015】
ボディ10の内側面には、端子装置30a,30bおよび接点装置40を位置決めするための保持リブ13および保持溝14がそれぞれ複数形成されている。端子装置30a,30bはボディ10の長手方向の両端部内に配置され、接点装置40はボディ10の長手方向の中央部内に配置される。
【0016】
端子装置30a,30bは、導電性の金属板により形成された端子板31,32と、各端子板31,32ごとに2個ずつ設けた鎖錠ばね33と、各端子板31,32ごとに2個ずつ設けた鎖錠ばね33に当接する合成樹脂成形品の解除釦34とを備える。各端子板31,32は、それぞれボディ10の長手方向の両端部付近でボディ10の幅方向の両内側面に設けた保持溝14に両側部が挿入保持される主片31a,32aと、主片31a,32aに対向する当接片31b,32bと、主片31a,32aと当接片31b,32bとの前端縁間を連続一体に連結するようにボディ10の開口面に沿って延長された連結片31c,32cとを備える。当接片31b,32bはボディ10の長手方向の中央部付近でボディ10の幅方向の両内側面に形成された保持リブ13に当接し、保持リブ13と保持溝14との間で端子板31,32がボディ10に保持される。鎖錠ばね33は主片31a,32aと当接片31b,32bとの間に収納される。端子板31には連結片31cから延長されて先端部に固定接点41を備える接点保持片31dがボディ10の長手方向の中央部に向かって斜め後向き(図9の下向き)に延設される。また、端子板32には当接片32bの後端縁からボディ10の長手方向の中央部に向かってボディ10の後面に沿う形で支持片32dが延設され、支持片32dの先端部には前面開放された断面V字状の支点用溝32eが支持片32dの延長方向に直交する形で形成される。
【0017】
鎖錠ばね33は、帯状の板ばねの一端部をS字状に曲成して接触片33aを形成し、他端部をJ字状に曲成して鎖錠片33bを形成し、接触片33aと鎖錠片33bとの間を接続片33cにより連続一体に連結した形状に形成される。また、接触片33aおよび鎖錠片33bは接続片33cに対して厚み方向の同じ側に突出する。鎖錠ばね33を端子板31,32の主片31a,32aと当接片32a,32bとの間に装着するに際しては、接続片33cを当接片32a,32bに当接させる形で接触片33aおよび鎖錠片33bを主片31a,32aに対向させる。ここに、接触片33aおよび鎖錠片33bの先端部は、先端側ほど接続片33cから離れる向きに傾斜し、かつ互いに略平行になるように延長されている。また、接触片33aおよび鎖錠片33bの先端部は、先端側ほど連結片31c,32cとの距離を小さくするように配置される。
【0018】
上述した電線挿入孔12は、端子板31,32の主片31a,32aと接触片33aおよび鎖錠片33bとの間に対応する部位に形成され、電線挿入孔12を通して器体1に電線2を挿入すると、電線2の先端部が主片31a,32aと接触片33aおよび鎖錠片33bとの間に挟持され、電線2が主片31a,32aに接触して端子装置30a,30bと電線2とが電気的に接続されるとともに、鎖錠片33bの先端縁が電線2に食い込むことによって電線2が器体1から抜けないように機械的に保持される。とくに、鎖錠片33bは電線挿入孔12を通して電線2を挿入する向きにおいて主片31a,31bとの距離を小さくするように傾斜しているから、電線2を引き抜く向きの力に対して鎖錠片33bが撓みにくく、電線2の引き抜きを確実に阻止することになる。ここに、電線2は絶縁被覆電線であって器体1に挿入する部位は芯線が露出するように絶縁被覆が除去される。したがって、主片31a,32aと鎖錠ばね33との間に電線2が挟持されるとは実際には芯線が挟持されることを意味する。
【0019】
ボディ10の後壁には解除釦34に対応する部位に操作孔15が貫設される。解除釦34は各端子装置30a,30bに設けた2個ずつの鎖錠ばね33の間に配置され、両鎖錠ばね33の鎖錠片33bの後面側にそれぞれ当接する2個の押し片34aが側面から突出する形状を有する。操作孔15はマイナスドライバの先端部のような工具が挿入可能となる形状を有し、工具を操作孔15に挿入して解除釦34を前方に押圧すると、鎖錠片33bが押し片34aから押圧力を受けることにより主片31a,32aから離れる向きに撓むようにしてある。したがって、上述のようにして端子装置30a,30bに電線2を接続した状態で操作孔15に工具を挿入して解除釦34を押圧すれば、鎖錠片33bが電線2から離れるように撓んで電線2の機械的保持が解除され、電線2を器体1から引き抜くことが可能になる。ここに、解除釦34には2個の押し片34aが設けられ、各端子装置30a,30bに設けた2個の鎖錠ばね33の鎖錠片33bを同時に押圧するから、各端子装置30a,30bに2本の電線2を接続しているときには1個の解除釦34を押圧すれば2本の電線2の機械的保持を同時に解除することができる。
【0020】
接点装置40は、端子板32の支持片32dに対して枢支された板状の開閉素子43を備え、開閉素子43には端子板31の接点保持片31dに設けた固定接点41に離接する可動接点42が設けられる。開閉素子43の後端縁は支持片32dに設けた支点用溝32eに挿入され、支点用溝32eを中心として開閉素子43が回動可能になっている。ボディ10の長手方向の中央部であってボディ10の後部には開閉素子43の側縁に突設された突片43aが挿入されるV字状の回動規制溝16が形成され、回動規制溝16によって開閉素子43の回動範囲が規制される。開閉素子43と反転ハンドル50との間にはコイルスプリングからなる反転ばね44が保持されており、開閉素子43の前端部には反転ばね44の一端部内に挿入されるばね座片43bが突設される。
【0021】
反転ばね44の他端部は反転ハンドル50の後面側に設けた筒部(図示せず)に挿入される。器体1の幅方向における反転ハンドル50の両側面には支点突起51が突設され、各支点突起51は前端部が先細りとなる形状に形成されている。カバー20の長手方向の中央部であって幅方向の両側部には開口窓22の周縁から前方に突出する一対の軸受突片23が突設され、両軸受突起23の対向面には反転ハンドル50の支点突起51が挿入される軸受凹所24が形成される。軸受凹所24は少なくとも前端部において支点突起51を揺動可能に枢支する。反転ハンドル50の長手方向の一端部には後述する位置表示灯71からの光を透過させるための透孔52が貫設され、さらに反転ハンドル50の長手方向の両端面には操作ハンドル60を反転ハンドル50に結合するための結合爪53がそれぞれ突設される。
【0022】
なお、カバー20の長手方向の両端部にはカバー20の両端部側縁に沿ってカバー20の前面から突出する当てリブ25がそれぞれ突設され、各当てリブ25の外側面には各一対の取付爪26が突設される。ここでは詳しく説明しないが、取付爪26は配線器具用の取付枠に設けた取付孔に係合することによって器体1を取付枠に保持させるために設けてあり、壁面などの施工面に器体1の一部を埋め込む形で施工する際に、施工面に固定される取付枠への器体1の結合作業が容易になっている。また、当てリブ25は器体1を取付枠に取り付けたときに取付枠の裏面側に当接することになる。操作ハンドル60は両当てリブ25の間に配置され、操作ハンドル60は揺動時において当てリブ25に干渉しないように形成される。このように当てリブ25をカバー20に突設し当てリブ25に取付爪26を設けたことによって、当てリブ25を設けない場合に比較すると操作ハンドル60を後方に位置させることが可能になり、施工状態においてカバー20と操作ハンドル60との間に形成される隙間が外部から見えにくくなる。
【0023】
操作ハンドル60は、図9に示すように、反転ハンドル50の前面を覆い、操作ハンドル60の後面には反転ハンドル50に設けた結合爪53に係合する結合脚61が突設される。結合脚61の先端部(後端部)には結合爪53の後面に係合する脚爪61aが形成され、操作ハンドル60の後面に突設した押さえ突起62と脚爪61aとの間で反転ハンドル50が保持され、結果的に操作ハンドル60が反転ハンドル50に固定されることになる。さらに、操作ハンドル60の長手方向の一端部には位置表示灯71からの光を外部に取り出すように導光するためのプリズム63が固着される。
【0024】
ところで、反転ハンドル50の後端部には合成樹脂成形品からなる回路基板70が保持される。回路基板70にはネオンランプからなる位置表示灯71および位置表示灯71の限流用の抵抗72が実装される。また、回路基板70の後面であって反転ハンドル50の長手方向の一端部に対応する部位には接点73が設けられている。回路基板70の中央部には円形に開口した圧入孔74が形成され、反転ハンドル50に設けた筒部が圧入孔74に圧入されることによって、反転ハンドル50に回路基板70が固定されるようにしてある。この状態において位置表示灯71は反転ハンドル50の透孔52を通してプリズム63に対向するように配置される。回路基板70に実装した回路(位置表示灯71と抵抗72との直列回路)の一端は接点73に接続され、他端は反転ハンドル50の筒部を通して反転ばね44に接触する。つまり、回路基板70に実装した回路の上記他端は反転ばね44を介して開閉素子43に電気的に接続されることになる。また、接点73は反転ハンドル50の揺動に伴って一方の端子板31に離接するように配置される。すなわち、反転ハンドル70が揺動することによって、接点73が離接する一方の端子装置30aと開閉素子43に電気的に接続されている他方の端子装置30bとの間に、回路基板70に実装された回路が挿入される状態と、回路が切り離された状態とを選択することになる。両端子装置30a,30bの間に回路が挿入される状態で固定接点41から可動接点42が離れるようにしておけば、接点装置40の開極時に位置表示灯71に通電され、位置表示灯71が点灯することになる。したがって、スイッチを照明器具の点灯・消灯を指示する目的で用いると、照明器具の消灯時において位置表示灯71が点灯し、暗がりでもスイッチの場所を容易に見つけることができるようになる。この構成では、固定接点41に可動接点42が接触した状態では接点73が端子板31から離れ、回路基板70に実装した回路には通電されない。
【0025】
しかして、上述したスイッチの動作を簡単に説明すれば、図9のように操作ハンドル60の右端部が左端部よりも後方(図の下方)に位置するときには可動接点42が固定接点41に接触するようにしているものとして、このとき接点73が左側の端子板31から離れるように接点73を設けておく。この状態では反転ばね44は中間部が両端部よりも左側に膨らんだ状態になり、反転ばね44によって可動接点42が固定接点41に押圧されて接点圧が付与される。一方、この状態から操作ハンドル60の左端部を後方に押すと、反転ばね44の前端部が右側に移動することにより反転ばね44は圧縮された後に急速に伸長して中間部が両端部よりも右側に膨らんだ状態になり、このとき開閉素子43を右側に倒して可動接点42を固定接点41から引き離す。つまり、反転ばね44のばね力は反転ハンドル50を左回りに回転させる向きに作用し、接点73を端子板31に接触させる接触圧が生じることになる。つまり、固定接点41と可動接点42とが離れている状態で、回路基板70に実装された回路に通電され、位置表示灯71が点灯するのである。
【0026】
ところで、上述した端子装置30a,30bに用いる端子板31,32は、電線2の芯線が撚り線である場合にも対応可能となるように構成してある。具体的には、図1ないし図3に示すように、端子板31,32の主片31a,32aにおいて鎖錠ばね33の鎖錠片33bの先端部付近において、鎖錠片33bが接触可能な部位であって電線挿入孔12を通して器体1に導入された電線2が接触する部位の両側に一対の案内突部38を突設してある。両案内突部38は主片31a,32aの幅方向に並ぶように配置され、案内突部38において互いに近い端部は球面の一部となる(いわゆるSR形状)に形成してある。したがって、電線挿入孔12から芯線が撚り線である電線2を導入した場合に、電線2がばらばらに広がったとしても案内突部38に乗り上げる形になって鎖錠片33bと案内突部38との間に電線2が確実に挟持され、しかも案内突部38がSR形状であることによって電線2はできるだけ両案内突部38の間を通るように誘導されることになる。要するに、電線2が撚り線であってもばらばらに広がる可能性を低減することができる。さらに、案内突部38の位置が鎖錠片33bの先端部付近であることによって、電線2が案内突部38に乗り上げた状態でも鎖錠片33bから比較的大きい接触圧を電線2に作用させることができ、電線2の電気的な接続を確実に確保することができる。端子板31,32と電線2との接触状態をさらに安定させるために、図4(a)に示すように、端子板31,32における電線2との接触部位に電線2の導入方向(図4の上下方向)おいて凹凸が交互に繰り返すローレット部36を形成するのが望ましい。このようなローレット部36を形成しておけば、電線2に対する摩擦が大きくなって細い撚り線でも接続可能になるとともに、電線2の表面に付着した汚れをローレット部36の凹凸によってある程度除去することができる。ここに、上述のように電線2は主として両案内突部38の間を通ることになるから、図4(c)のように、ローレット部36は両案内突部38の間の幅程度に設ければよく、端子板31,32の一部にのみローレット部36を設ければよいことになる。
【0027】
上述した2個の案内突部38は図4(a)のように電線2の挿入方向(図4の上下方向)に直交させて配置してもよいが、図4(b)(c)のように、電線2の先端側(図4の上側)に向かって互いの距離を小さくする形で配置してもよい。案内突起38をこのように配置すれば、器体1に導入された電線2はばらばらになろうとしても、両案内突起38の間を通るように両案内突起によって追い込まれることになり、撚り線を芯線とする電線2であっても撚り線がばらばらにならず、端子板31,32と鎖錠ばね33との間に電線2を確実に保持することが可能になる。
【0028】
上述の構成例では案内突起38を設けているだけであるが、図5および図6に示すように、主片31a,32aの一方の側縁に鎖錠片33bの側縁に沿ったガード片39を突設してもよい。ガード片39は、端子板31,32に対応する2個の鎖錠ばね33について、それぞれ一方の側縁に沿って形成され、かつ両鎖錠ばね33の間の部位に設けられる。このようなガード片39を設けていることによって、鎖錠ばね33の位置ずれが抑制されるとともに、電線2の芯線が撚り線であってもガード片39によって電線2の挿入される範囲が規制されることになる。なお、主片31a,32aの他方の側縁はボディ10の内側面に設けた保持溝14に挿入され、ガード片39はボディ10の内側面に対向することになる。つまり、他方の側縁にはガード片39を設けることなく電線2の位置の規制が可能になる。
【0029】
本発明における端子装置の適用例として、単極双投型のスイッチ(いわゆる3路スイッチ)を以下に示す。3路スイッチでは、図10ないし図12に示すように、3個の端子装置30b,30c,30dを用いる。端子装置30bは上述した単極単投スイッチと同構成であって、単極単投スイッチに用いた端子装置30aに代えて2個の端子装置30c,30dを用いる。各端子装置30c,30dはそれぞれ端子板45,46を備え、各端子板45,46には、器体1に設けた電線挿入孔12を通して器体1に導入された電線2が接触する主片45a,46aと、それぞれボディ10に設けた保持リブ13に当接する当接片45b,46bと、主片45a,46aと当接片45b,46bとの間を連結する連結片45c,46cと、連結片45c,46cから連続一体に延長され先端部にそれぞれ固定接点41a,41bを設けた接点保持片45d,46dとが設けられる。両端子装置30c,30dの接点保持片45d,46dの先端部は互いに対向するように配置され、固定接点41a,41bは対向する。また開閉素子43は厚み方向の両面に可動接点42a,42bを備え、開閉素子43の回動に伴って各固定接点41a,41bに各可動接点42a,42bが選択的に接触するようにしてある。つまり、固定接点41aに可動接点42aが接触している間は可動接点42bは固定接点41bから離れ、固定接点41bに可動接点42bが接触している間は可動接点42aは固定接点41aから離れる。
【0030】
端子装置30c,30dはボディ10の長手方向における同じ側(図12における左側)に配置されており、各端子板45,46にはそれぞれ1個ずつの鎖錠ばね33が収納される。ただし、両端子板45,46の鎖錠ばね33の間に1つの解除釦34が配置される。さらに、各端子板45,46の連結片45c,46cには導電性の金属板からなる接触子47がかしめ固定される。各接触子47は回路基板70に弾接するように弾性が付与されており、反転ハンドル50の揺動にかかわらず接触子47がつねに回路基板70に弾接するようにしてある。回路基板70には位置表示灯71と抵抗(図示せず)との直列回路が実装され、この直列回路の各一端にそれぞれ接触子47が接触する。この種の3路スイッチは階段灯の点灯・消灯に用いられることが多く、階上と階下とにそれぞれ3路スイッチを配置して階段灯の点灯・消灯とを階上と階下とのいずれにおいても操作可能とすることができる。したがって、両固定接点31a,31bの間に位置表示灯71と抵抗との直列回路を挿入しておけば、階段灯の消灯時に位置表示灯71を点灯させることができる。この種の回路の接続関係は周知であるから説明を省略する。また、3路スイッチの他の構成は単極単投型のスイッチと同様である。
【0031】
なお、端子板31,32に案内突起38を設けずにガード片39のみを設けた構成としてもよい。また、接点装置40の構成として、上述の例では単極単投型のスイッチ(いわゆる片切り型のスイッチ)と3路スイッチとを例示したが、本発明の技術思想はこれらのスイッチへの適用に限定されるものではなく、たとえば2極単投型のスイッチやいわゆる4路型のスイッチ(4端子のうちの2端子と残りの2端子とを一対一に接続する2つの接続関係が選択可能なスイッチ)に適用することも可能であり、さらにはスイッチだけではなくコンセントや照明器具などに適用することも可能である。
【0032】
【発明の効果】
請求項1の発明は、電気器具の器体に貫設した電線挿入孔を通して器体に導入された電線に接触する端子板と、端子板に向かってばね付勢され端縁を前記電線に弾接させることにより端子板との間で前記電線を挟持する鎖錠片を有した鎖錠ばねとを備え、端子板において前記電線を接触させる面には、前記電線の挿入方向に交わる方向において、中央部に導入された前記電線を鎖錠片との間に挟持する部位の両側であって、電線挿入孔から芯線が撚り線である電線を導入して当該電線がばらばらに広がった場合に当該電線を鎖錠片との間に挟持する部位に一対の案内突部が突設されているものであり、案内突起の間を電線が通れば電線は広がらずに鎖錠ばねとの間で挟持され、撚り線を芯線とする電線の一部が広がっても、電線が案内突起に乗り上げた状態で鎖錠片から比較的大きい接触圧を電線に作用させることができ、案内突起と鎖錠ばねとの間で電線の電気的な接続が確実に確保されるから、撚り線を芯線とする電線であっても、器体に設けた電線挿入孔に電線を挿入するだけで結線作業が行えるという利点を有する。
【0033】
請求項2の発明は、請求項1の発明において、前記案内突部において少なくとも互いに近い側の端部が球面状に形成されているから、撚り線を芯線とする電線が広がろうとしても両案内突部の間に電線が追い込まれることになり、電線が広がるのを防止することができる。
【0034】
請求項3の発明は、請求項1の発明において、前記案内突部が前記鎖錠片の端縁の一部に対向する位置に形成されているので、鎖錠片により端子板に電線を押し付けることができ、電線に対する比較的大きい保持力を確保することができる。
【0035】
請求項4の発明は、請求項1の発明において、一対の前記案内突部が前記電線の先端側に向かって互いの距離を小さくする形で配置されているので、器体に導入された電線が両案内突起の間を通るように案内されることになり、芯線が撚り線である電線であっても芯線が広がることなくまとまって、鎖錠ばねと端子板との間で確実に保持することができる。
【0036】
請求項5の発明は、請求項1の発明において、前記端子板において前記電線との接触部位には電線の導入方向おいて凹凸が交互に繰り返すローレット部が形成されているものであり、ローレット部の凹凸によって電線の表面に付着した異物を除去することができ、端子板と電線との電気的接続状態が良好になる。また、案内突起を設けて電線が通る部位を規制しているから、規制された範囲内にローレット部を形成すればよく、ローレット部の領域を少なくすることができる。
【0037】
請求項6の発明は、請求項1の発明において、前記端子板において前記電線を接触させる面には前記鎖錠片の側縁に沿ってガード片が突設されているものであり、ガード片を設けたことによって電線が不要な部位に挿入されるのを防止することができる。また、ガード片によって電線の通る部位が規制されるから、芯線が撚り線である電線でも電線の広がりを規制して鎖錠ばねと端子板との間で電線を保持することができる。つまり、撚り線を芯線とする電線であっても、器体に設けた電線挿入孔に電線を挿入するだけで結線作業が行える。
【図面の簡単な説明】
【図1】本発明の実施の形態を示す分解斜視図である。
【図2】同上に用いる端子板を示し、(a)は平面図、(b)は縦断面図である。
【図3】同上の縦断面図である。
【図4】(a)〜(c)はそれぞれ同上に用いる端子板の一例を示す横断面図である。
【図5】同上の他の構成例を示す分解斜視図である。
【図6】図5に示した構成例に用いる端子板を示し、(a)は平面図、(b)は縦断面図である。
【図7】同上を用いたスイッチを示す分解斜視図である。
【図8】同上を用いたスイッチを示し、(a)は正面図、(b)は下面図、(c)は側面図である。
【図9】同上を用いたスイッチの縦断面図である。
【図10】同上を用いた他のスイッチを示す分解斜視図である。
【図11】同上を用いた他のスイッチを示し、(a)は正面図、(b)は下面図、(c)は側面図である。
【図12】同上を用いた他のスイッチの縦断面図である。
【図13】従来例に用いる端子板を示し、(a)は平面図、(b)は縦断面図である。
【符号の説明】
1 器体
2 電線
12 電線挿入孔
31,32 端子板
33 鎖錠ばね
33b 鎖錠片
36 ローレット部
38 案内突起
39 ガード片
45,46 端子板
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terminal device that is housed in a body of an electric appliance such as a switch, an outlet, and a lighting fixture and connects an electric wire.
[0002]
[Prior art]
Conventionally, a terminal device called a quick connection terminal has been widely used in a wiring device such as a switch or an outlet or a lighting device in order to connect an electric wire introduced into the device through an electric wire insertion hole provided in the device. Yes. This type of terminal device clamps the electric wire between the terminal plate 3 and the terminal plate 3 having a shape as shown in FIG. 13 that comes into contact with the electric wire housed in the vessel and introduced into the vessel through the electric wire insertion hole. Many have a structure including a locking spring. The locking spring is a leaf spring, and is formed so as to hold the electric wire by sandwiching the electric wire between the edge of the locking piece provided on the locking spring and the terminal plate 3. That is, when an electric wire is introduced into the container through an electric wire insertion hole provided in the container, the electric wire bends in a direction to pull the locking piece away from the terminal plate 3, and thereby the electric wire is connected to the terminal plate by the spring force generated in the locking piece. It is comprised so that it may be clamped between 3 and a lock piece. Here, in a state where the electric wire is sandwiched between the terminal plate 3 and the locking piece, the end of the locking piece elastically contacts the electric wire, and the locking piece cuts into a part of the electric wire, thereby preventing the electric wire from coming off. The Thus, since the electric wire is held in a state in which the electric wire is in contact with the terminal plate 3 simply by inserting the electric wire into the electric wire insertion hole, it is easier to connect the electric wire than a terminal device that connects the electric wire using a terminal screw. Become.
[0003]
[Problems to be solved by the invention]
By the way, many of the terminal devices of this type that have been known so far are supposed to connect an electric wire whose core wire is a single wire, and when the core wire is a stranded wire, the effect of retaining by the locking piece Cannot be obtained sufficiently. That is, when the terminal plate 3 whose main piece 3a which is a contact part with an electric wire is a flat plate like the terminal plate 3 shown in FIG. 13, if the core wire is a stranded wire, it is between the terminal plate 3 and the locking piece. When the wire is introduced into the wire, the wires constituting the stranded wire spread apart, so that the distance between the lock spring and the terminal plate becomes small, and sufficient contact pressure by the lock spring cannot be obtained. To solve this problem, it is conceivable to increase the spring constant of the locking piece. However, when the spring constant of the locking piece increases, it is necessary to introduce an electric wire between the terminal plate 3 and the locking piece. As a result, when the electric wire is inserted between the terminal plate and the locking piece, the locking piece does not bend and the electric wire cannot be held. For this reason, when using an electric wire whose core wire is a stranded wire, a separate member is attached to the end portion of the electric wire or the end portion of the electric wire is hardened with solder in order to prevent the stranded wire from breaking apart. However, the current situation is that the advantage of the quick connection terminal that the connection work becomes easy is lost.
[0004]
The present invention has been made in view of the above-mentioned reasons, and its purpose is to insert a wire provided in a container without performing any processing on the end portion of the wire even if the core wire is a stranded wire. An object of the present invention is to provide a terminal device capable of connecting an electric wire only by introducing the electric wire through a hole.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a terminal plate that comes into contact with an electric wire introduced into the container through an electric wire insertion hole provided in the container of the electric appliance, and a spring biased toward the terminal plate so that the end edge is elastically applied to the electric wire. A locking spring having a locking piece for holding the electric wire between the terminal plate and the terminal plate, The surface that is in contact with the electric wire was introduced into the center in the direction intersecting the insertion direction of the electric wire. On both sides of the part that clamps the electric wire between the locking pieces, When a wire whose core wire is a stranded wire is introduced from the wire insertion hole and the wire spreads apart, the wire is sandwiched between the locking pieces. A pair of guide protrusions is provided.
[0006]
According to a second aspect of the present invention, in the first aspect of the invention, at least the ends close to each other in the guide projection are formed in a spherical shape.
[0007]
According to a third aspect of the present invention, in the first aspect of the present invention, the guide projection is formed at a position facing a part of an edge of the locking piece.
[0008]
According to a fourth aspect of the present invention, in the first aspect of the present invention, the pair of guide protrusions are arranged in such a manner that the distance from each other decreases toward the distal end side of the electric wire.
[0009]
According to a fifth aspect of the present invention, in the first aspect of the invention, a knurled portion in which unevenness is alternately repeated in the direction of introduction of the electric wire is formed at a contact portion of the terminal plate with the electric wire.
[0010]
According to a sixth aspect of the present invention, in the first aspect of the present invention, a guard piece protrudes along a side edge of the locking piece on the surface of the terminal plate that contacts the electric wire.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the embodiment described below, an example in which the terminal device of the present invention is applied to a switch is shown, but this does not preclude the application of the same configuration in another electrical device.
[0013]
First, a switch to which the terminal device is applied will be described. The switch shown in FIG. 7 to FIG. 9 includes a rectangular parallelepiped synthetic resin molded body 10 whose front surface (upper surface in FIG. 7) is open, and a synthetic resin molding that is formed in a rectangular frame shape and coupled to the front side of the body 10. The container 1 comprised with the cover 20 of goods is provided. A pair of assembly projections 11 project from the both outer side surfaces in the width direction of the body 10 so as to be spaced apart in the longitudinal direction of the body 10, and an assembly tongue piece 21 extends rearward from the rear end edge of the cover 20. The body 10 and the cover 20 are coupled by the assembly protrusion 11 engaging with the assembly hole 21 a provided in the assembly tongue piece 21.
[0014]
The body 10 has two terminal devices 30a and 30b for connecting an electric wire 2 (see FIG. 3) to be inserted into the container body 1 through an electric wire insertion hole 12 provided on the rear wall of the body 10, and terminal devices 30a and 30b. And a contact device 40 that opens and closes the electric circuit between them. On the other hand, a reversing handle 50 of a synthetic resin molded product is mounted on the opening window 22 in the center of the cover 20 so as to be swingable with respect to the cover 20. As the reversing handle 50 swings, the reversing handle 50 swings. The contact device 40 is opened and closed. A synthetic resin molded operation handle 60 overlapping the front surface of the cover 20 is detachably coupled to the front side of the reversing handle 50, and the reversing handle 50 is swung by swinging the operating handle 60 as an operating portion. Thus, the contact device 40 is opened and closed.
[0015]
A plurality of holding ribs 13 and holding grooves 14 for positioning the terminal devices 30 a and 30 b and the contact device 40 are formed on the inner surface of the body 10. The terminal devices 30a and 30b are disposed in both ends of the body 10 in the longitudinal direction, and the contact device 40 is disposed in the center of the body 10 in the longitudinal direction.
[0016]
The terminal devices 30a and 30b include terminal plates 31 and 32 formed of conductive metal plates, two locking springs 33 provided for each terminal plate 31 and 32, and each terminal plate 31 and 32. It includes a release button 34 for a synthetic resin molded product that comes into contact with two lock springs 33 provided. Each of the terminal plates 31 and 32 includes main pieces 31a and 32a having both side portions inserted and held in holding grooves 14 provided on both inner side surfaces in the width direction of the body 10 near both ends in the longitudinal direction of the body 10, respectively. It is extended along the opening surface of the body 10 so as to continuously connect the contact pieces 31b, 32b facing the pieces 31a, 32a and the front end edges of the main pieces 31a, 32a and the contact pieces 31b, 32b. Connecting pieces 31c and 32c. The contact pieces 31b and 32b are in contact with holding ribs 13 formed on both inner side surfaces in the width direction of the body 10 in the vicinity of the center portion in the longitudinal direction of the body 10, and between the holding ribs 13 and the holding grooves 14, a terminal plate. 31 and 32 are held by the body 10. The lock spring 33 is accommodated between the main pieces 31a and 32a and the contact pieces 31b and 32b. A contact holding piece 31d, which is extended from the connecting piece 31c and has a fixed contact 41 at the tip, extends diagonally backward (downward in FIG. 9) toward the longitudinal center of the body 10. Further, a support piece 32d is extended from the rear end edge of the contact piece 32b toward the longitudinal center of the body 10 along the rear surface of the body 10 on the terminal plate 32, and at the front end of the support piece 32d. Is formed with a fulcrum groove 32e having a V-shaped cross-section opened front and perpendicular to the extending direction of the support piece 32d.
[0017]
The locking spring 33 is formed by bending one end of a belt-shaped leaf spring into an S shape to form a contact piece 33a, and bending the other end into a J shape to form a locking piece 33b. It is formed in a shape in which the piece 33a and the locking piece 33b are continuously and integrally connected by a connecting piece 33c. Further, the contact piece 33a and the locking piece 33b protrude on the same side in the thickness direction with respect to the connection piece 33c. When the locking spring 33 is mounted between the main pieces 31a, 32a of the terminal plates 31, 32 and the contact pieces 32a, 32b, the contact piece 33c is brought into contact with the contact pieces 32a, 32b. 33a and the locking piece 33b are made to oppose the main pieces 31a and 32a. Here, the distal end portions of the contact piece 33a and the locking piece 33b are inclined so as to be away from the connection piece 33c toward the distal end side, and are extended so as to be substantially parallel to each other. Further, the distal end portions of the contact piece 33a and the locking piece 33b are arranged so that the distance from the connecting pieces 31c and 32c becomes smaller toward the distal end side.
[0018]
The above-described wire insertion hole 12 is formed at a portion corresponding to between the main pieces 31a and 32a of the terminal plates 31 and 32 and the contact piece 33a and the locking piece 33b. Is inserted between the main pieces 31a, 32a and the contact pieces 33a and the locking pieces 33b, and the electric wire 2 comes into contact with the main pieces 31a, 32a and the terminal devices 30a, 30b and the electric wires. 2 is electrically connected, and the leading edge of the locking piece 33b bites into the electric wire 2 so that the electric wire 2 is mechanically held so as not to come out of the container 1. In particular, the locking piece 33b is inclined so as to reduce the distance from the main pieces 31a and 31b in the direction in which the electric wire 2 is inserted through the electric wire insertion hole 12, so that the locking piece 33b is locked against the force in the direction in which the electric wire 2 is pulled out. The piece 33b is difficult to bend, and the wire 2 is reliably prevented from being pulled out. Here, the electric wire 2 is an insulation-coated electric wire, and the insulation coating is removed so that the core wire is exposed at a portion to be inserted into the container body 1. Therefore, the electric wire 2 being clamped between the main pieces 31a, 32a and the lock spring 33 means that the core wire is actually clamped.
[0019]
An operation hole 15 is provided in the rear wall of the body 10 at a portion corresponding to the release button 34. The release button 34 is disposed between the two locking springs 33 provided on each of the terminal devices 30a and 30b, and the two pressing pieces 34a are in contact with the rear side of the locking pieces 33b of the two locking springs 33, respectively. Has a shape protruding from the side surface. The operation hole 15 has a shape that allows insertion of a tool such as the tip of a minus driver. When the tool is inserted into the operation hole 15 and the release button 34 is pressed forward, the locking piece 33b is moved from the push piece 34a. By receiving the pressing force, it bends away from the main pieces 31a and 32a. Therefore, when the tool 2 is inserted into the operation hole 15 and the release button 34 is pressed while the electric wire 2 is connected to the terminal devices 30a and 30b as described above, the locking piece 33b bends away from the electric wire 2. The mechanical holding of the electric wire 2 is released, and the electric wire 2 can be pulled out from the container 1. Here, the release button 34 is provided with two pressing pieces 34a, and simultaneously presses the locking pieces 33b of the two locking springs 33 provided on the terminal devices 30a and 30b. When two electric wires 2 are connected to 30b, the mechanical holding of the two electric wires 2 can be released simultaneously by pressing one release button 34.
[0020]
The contact device 40 includes a plate-like opening / closing element 43 pivotally supported with respect to the support piece 32 d of the terminal plate 32, and the opening / closing element 43 is separated from and connected to the fixed contact 41 provided on the contact holding piece 31 d of the terminal plate 31. A movable contact 42 is provided. The rear end edge of the opening / closing element 43 is inserted into a fulcrum groove 32e provided in the support piece 32d, and the opening / closing element 43 is rotatable about the fulcrum groove 32e. A V-shaped rotation restricting groove 16 into which a projecting piece 43 a protruding from the side edge of the opening / closing element 43 is inserted is formed at the center of the body 10 in the longitudinal direction and at the rear of the body 10. The rotation range of the opening / closing element 43 is restricted by the restriction groove 16. A reversing spring 44 made of a coil spring is held between the opening / closing element 43 and the reversing handle 50, and a spring seat piece 43 b inserted into one end of the reversing spring 44 projects from the front end of the opening / closing element 43. Is done.
[0021]
The other end of the reversing spring 44 is inserted into a cylindrical portion (not shown) provided on the rear surface side of the reversing handle 50. A fulcrum protrusion 51 is provided on both side surfaces of the reversing handle 50 in the width direction of the container 1, and each fulcrum protrusion 51 is formed in a shape with a tapered front end. A pair of bearing protrusions 23 projecting forward from the peripheral edge of the opening window 22 are provided on both sides of the cover 20 in the longitudinal direction and in the width direction. A bearing recess 24 into which 50 fulcrum protrusions 51 are inserted is formed. The bearing recess 24 pivotally supports the fulcrum projection 51 at least at the front end portion so as to be swingable. At one end in the longitudinal direction of the reversing handle 50, a through hole 52 for transmitting light from a position indicator lamp 71 which will be described later is penetrated, and the operation handle 60 is reversed at both end surfaces of the reversing handle 50 in the longitudinal direction. A coupling claw 53 for coupling to the handle 50 is projected.
[0022]
Note that, at both ends in the longitudinal direction of the cover 20, abutting ribs 25 projecting from the front surface of the cover 20 along the side edges of the both ends of the cover 20 are respectively projected. A mounting claw 26 is projected. Although not described in detail here, the attachment claw 26 is provided to hold the container 1 on the attachment frame by engaging with an attachment hole provided in the attachment frame for the wiring device. When construction is performed in such a manner that a part of the body 1 is embedded, it is easy to join the container body 1 to the mounting frame fixed to the construction surface. The abutment rib 25 comes into contact with the back side of the mounting frame when the container 1 is mounted on the mounting frame. The operation handle 60 is disposed between the two abutment ribs 25, and the operation handle 60 is formed so as not to interfere with the abutment ribs 25 when swinging. Thus, by providing the abutment rib 25 on the cover 20 and providing the attachment claw 26 on the abutment rib 25, it becomes possible to position the operation handle 60 rearward as compared with the case where the abutment rib 25 is not provided. A gap formed between the cover 20 and the operation handle 60 in the construction state becomes difficult to see from the outside.
[0023]
As shown in FIG. 9, the operation handle 60 covers the front surface of the reversing handle 50, and a coupling leg 61 that engages with a coupling claw 53 provided on the reversing handle 50 projects from the rear surface of the operating handle 60. A leg claw 61a that engages the rear surface of the coupling claw 53 is formed at the front end portion (rear end portion) of the coupling leg 61, and the reversing handle 50 is provided between the pressing projection 62 projecting on the rear surface of the operation handle 60 and the leg claw 61a. As a result, the operation handle 60 is fixed to the inversion handle 50. Further, a prism 63 for guiding the light from the position indicator lamp 71 to the outside is fixed to one end of the operation handle 60 in the longitudinal direction.
[0024]
Incidentally, a circuit board 70 made of a synthetic resin molded product is held at the rear end portion of the reversing handle 50. On the circuit board 70, a position indicator lamp 71 made of a neon lamp and a current limiting resistor 72 of the position indicator lamp 71 are mounted. A contact 73 is provided on a rear surface of the circuit board 70 and corresponding to one end of the reversing handle 50 in the longitudinal direction. A press-fit hole 74 that is opened in a circular shape is formed at the center of the circuit board 70, and a cylindrical part provided in the reversing handle 50 is press-fitted into the press-fitting hole 74 so that the circuit board 70 is fixed to the reversing handle 50. It is. In this state, the position indicator lamp 71 is disposed so as to face the prism 63 through the through hole 52 of the reversing handle 50. One end of the circuit (the series circuit of the position indicator lamp 71 and the resistor 72) mounted on the circuit board 70 is connected to the contact 73, and the other end contacts the reversing spring 44 through the cylindrical portion of the reversing handle 50. That is, the other end of the circuit mounted on the circuit board 70 is electrically connected to the opening / closing element 43 via the reversing spring 44. Further, the contact 73 is disposed so as to be in contact with and away from the one terminal board 31 as the reversing handle 50 swings. That is, when the reversing handle 70 is swung, the contact 73 is mounted on the circuit board 70 between the one terminal device 30a to be separated from and connected to the other terminal device 30b electrically connected to the switching element 43. The state in which the circuit is inserted and the state in which the circuit is disconnected are selected. If the movable contact 42 is separated from the fixed contact 41 in a state where a circuit is inserted between the both terminal devices 30a and 30b, the position indicator lamp 71 is energized when the contact device 40 is opened, and the position indicator lamp 71 Will light up. Therefore, when the switch is used for the purpose of instructing to turn on / off the lighting fixture, the position indicator lamp 71 is turned on when the lighting fixture is turned off, and the location of the switch can be easily found even in the dark. In this configuration, when the movable contact 42 is in contact with the fixed contact 41, the contact 73 is separated from the terminal plate 31 and the circuit mounted on the circuit board 70 is not energized.
[0025]
Thus, the operation of the above-described switch will be briefly described. When the right end portion of the operation handle 60 is located behind the lower end portion (downward in the drawing) as shown in FIG. 9, the movable contact 42 contacts the fixed contact 41. In this case, the contact 73 is provided so that the contact 73 is separated from the left terminal plate 31 at this time. In this state, the reversing spring 44 is in a state where the intermediate portion swells to the left of both ends, and the reversing spring 44 presses the movable contact 42 against the fixed contact 41 to apply contact pressure. On the other hand, when the left end portion of the operation handle 60 is pushed rearward from this state, the front end portion of the reversing spring 44 moves to the right side, so that the reversing spring 44 is rapidly compressed after being compressed and the intermediate portion is more than the both end portions. At this time, the switching element 43 is tilted to the right side and the movable contact 42 is pulled away from the fixed contact 41. That is, the spring force of the reversing spring 44 acts in a direction to rotate the reversing handle 50 counterclockwise, and a contact pressure that causes the contact 73 to contact the terminal plate 31 is generated. That is, in a state where the fixed contact 41 and the movable contact 42 are separated from each other, the circuit mounted on the circuit board 70 is energized, and the position indicator lamp 71 is lit.
[0026]
By the way, the terminal boards 31 and 32 used for the terminal device 30a and 30b mentioned above are comprised so that it can respond also when the core wire of the electric wire 2 is a strand wire. Specifically, as shown in FIGS. 1 to 3, the locking piece 33 b can come into contact with the main pieces 31 a and 32 a of the terminal plates 31 and 32 in the vicinity of the distal end portion of the locking piece 33 b of the locking spring 33. A pair of guide protrusions 38 are provided on both sides of a portion of the portion where the electric wire 2 introduced into the vessel 1 through the wire insertion hole 12 contacts. Both guide protrusions 38 are arranged so as to be aligned in the width direction of the main pieces 31a, 32a, and the ends close to each other in the guide protrusions 38 are formed as part of a spherical surface (so-called SR shape). Therefore, when the electric wire 2 whose core wire is a stranded wire is introduced from the electric wire insertion hole 12, even if the electric wire 2 spreads apart, the lock piece 33b and the guide protrusion 38 are formed on the guide protrusion 38. Since the electric wire 2 is securely held between the guide projections 38 and the guide projections 38 have an SR shape, the electric wires 2 are guided to pass between the guide projections 38 as much as possible. In short, even if the electric wire 2 is a stranded wire, the possibility of spreading apart can be reduced. Furthermore, since the position of the guide protrusion 38 is near the tip of the locking piece 33b, a relatively large contact pressure is applied to the electric wire 2 from the locking piece 33b even when the electric wire 2 rides on the guide protrusion 38. Thus, the electrical connection of the electric wire 2 can be reliably ensured. In order to further stabilize the contact state between the terminal plates 31 and 32 and the electric wire 2, as shown in FIG. 4A, the direction of introduction of the electric wire 2 (FIG. 4) at the contact portion of the terminal plates 31 and 32 with the electric wire 2. It is desirable to form the knurled portion 36 in which the unevenness is alternately repeated in the vertical direction). If such a knurled portion 36 is formed, the friction with respect to the electric wire 2 is increased, so that even a thin stranded wire can be connected, and dirt adhered to the surface of the electric wire 2 is removed to some extent by the unevenness of the knurled portion 36. Can do. Here, since the electric wire 2 mainly passes between the two guide projections 38 as described above, the knurled portion 36 is provided with a width between the two guide projections 38 as shown in FIG. What is necessary is to provide the knurled portion 36 only on a part of the terminal boards 31 and 32.
[0027]
The two guide protrusions 38 described above may be arranged orthogonal to the insertion direction of the electric wire 2 (vertical direction in FIG. 4) as shown in FIG. Thus, you may arrange | position so that a mutual distance may become small toward the front end side (upper side of FIG. 4) of the electric wire 2. FIG. If the guide protrusions 38 are arranged in this way, even if the electric wire 2 introduced into the container body 1 is to be separated, it is driven by the both guide protrusions so as to pass between the two guide protrusions 38. Even in the case of the electric wire 2 having a core wire, the twisted wires are not separated, and the electric wire 2 can be reliably held between the terminal plates 31 and 32 and the lock spring 33.
[0028]
In the above configuration example, only the guide protrusion 38 is provided, but as shown in FIGS. 5 and 6, the guard piece along the side edge of the locking piece 33b is provided on one side edge of the main pieces 31a and 32a. 39 may be provided. The guard piece 39 is formed along one side edge of each of the two lock springs 33 corresponding to the terminal plates 31 and 32, and is provided at a portion between the two lock springs 33. By providing such a guard piece 39, the position shift of the locking spring 33 is suppressed, and the range in which the electric wire 2 is inserted by the guard piece 39 is restricted even if the core wire of the electric wire 2 is a stranded wire. Will be. The other side edge of the main pieces 31 a and 32 a is inserted into the holding groove 14 provided on the inner side surface of the body 10, and the guard piece 39 faces the inner side surface of the body 10. That is, the position of the electric wire 2 can be regulated without providing the guard piece 39 on the other side edge.
[0029]
As an application example of the terminal device in the present invention, a single pole double throw switch (so-called three-way switch) is shown below. In the three-way switch, as shown in FIGS. 10 to 12, three terminal devices 30b, 30c, and 30d are used. The terminal device 30b has the same configuration as the single-pole single-throw switch described above, and uses two terminal devices 30c and 30d instead of the terminal device 30a used for the single-pole single-throw switch. Each terminal device 30c, 30d is provided with a terminal plate 45, 46, respectively, and each terminal plate 45, 46 is a main piece with which the electric wire 2 introduced into the container body 1 through the electric wire insertion hole 12 provided in the container body 1 contacts. 45a, 46a, contact pieces 45b, 46b that contact the holding ribs 13 provided on the body 10, and connecting pieces 45c, 46c that connect the main pieces 45a, 46a and the contact pieces 45b, 46b, Contact holding pieces 45d and 46d are provided which extend continuously and integrally from the connecting pieces 45c and 46c and are provided with fixed contacts 41a and 41b at the tip portions, respectively. The tip portions of the contact holding pieces 45d and 46d of the both terminal devices 30c and 30d are arranged so as to face each other, and the fixed contacts 41a and 41b face each other. The switching element 43 includes movable contacts 42a and 42b on both surfaces in the thickness direction, and the movable contacts 42a and 42b selectively come into contact with the fixed contacts 41a and 41b as the switching element 43 rotates. . That is, the movable contact 42b is separated from the fixed contact 41b while the movable contact 42a is in contact with the fixed contact 41a, and the movable contact 42a is separated from the fixed contact 41a while the movable contact 42b is in contact with the fixed contact 41b.
[0030]
The terminal devices 30c and 30d are disposed on the same side in the longitudinal direction of the body 10 (left side in FIG. 12), and one locking spring 33 is housed in each terminal plate 45 and 46, respectively. However, one release button 34 is disposed between the lock springs 33 of both terminal plates 45 and 46. Further, a contact 47 made of a conductive metal plate is caulked and fixed to the connecting pieces 45c and 46c of the terminal plates 45 and 46, respectively. Each contact 47 is provided with elasticity so as to elastically contact the circuit board 70, and the contact 47 is always elastically contacted to the circuit board 70 regardless of the swinging of the reversing handle 50. A series circuit of a position indicator lamp 71 and a resistor (not shown) is mounted on the circuit board 70, and a contactor 47 is in contact with each end of the series circuit. This type of three-way switch is often used to turn on / off stair lights, and a three-way switch is arranged on each of the upper and lower floors to turn on / off the stair lights either on the upper or lower floor. Can also be operable. Therefore, if a series circuit of the position indicator lamp 71 and the resistor is inserted between the fixed contacts 31a and 31b, the position indicator lamp 71 can be turned on when the staircase lamp is turned off. Since the connection relationship of this type of circuit is well known, description thereof is omitted. The other configuration of the three-way switch is the same as that of the single-pole single-throw switch.
[0031]
In addition, it is good also as a structure which provided only the guard piece 39 instead of providing the guide protrusion 38 in the terminal boards 31 and 32. FIG. Further, as the configuration of the contact device 40, in the above example, a single-pole single-throw switch (so-called one-sided switch) and a three-way switch are exemplified, but the technical idea of the present invention is applied to these switches. For example, a two-pole single-throw type switch or a so-called four-way type switch (two connection relations in which two of the four terminals and the remaining two terminals are connected one-to-one can be selected. It is also possible to apply to not only switches but also outlets and lighting fixtures.
[0032]
【The invention's effect】
According to the first aspect of the present invention, there is provided a terminal plate that comes into contact with an electric wire introduced into the container through an electric wire insertion hole provided in the container of the electric appliance, and a spring biased toward the terminal plate so that the end edge is elastically applied to the electric wire. A locking spring having a locking piece for holding the electric wire between the terminal plate and the terminal plate, The surface that is in contact with the electric wire was introduced into the center in the direction intersecting the insertion direction of the electric wire. On both sides of the part that clamps the electric wire between the locking pieces, When a wire whose core wire is a stranded wire is introduced from the wire insertion hole and the wire spreads apart, the wire is sandwiched between the locking pieces. A pair of guide protrusions are projected, and if the electric wire passes between the guide protrusions, the electric wire does not spread but is clamped between the locking springs, and part of the electric wire with the stranded wire as the core wire is Even if it spreads, a relatively large contact pressure can be applied to the electric wire from the locking piece while the electric wire rides on the guide protrusion, and the electric connection of the electric wire is ensured between the guide protrusion and the locking spring. Since it is ensured, even if it is an electric wire which uses a twisted wire as a core wire, it has the advantage that a wire connection operation | work can be performed only by inserting an electric wire in the electric wire insertion hole provided in the container.
[0033]
The invention according to claim 2 is the invention according to claim 1, wherein at least the ends close to each other in the guide projection are formed in a spherical shape, so that even if an electric wire having a stranded wire as a core wire is going to spread, An electric wire will be driven between guide protrusions, and it can prevent that an electric wire spreads.
[0034]
According to a third aspect of the present invention, in the first aspect of the invention, the guide projection is formed at a position facing a part of the edge of the locking piece, so that the electric wire is pressed against the terminal plate by the locking piece. And a relatively large holding force for the electric wire can be secured.
[0035]
According to a fourth aspect of the present invention, in the first aspect of the invention, the pair of guide protrusions are arranged in such a manner that the distance from each other decreases toward the distal end side of the electric wire. Will be guided so as to pass between both guide projections, and even if the core wire is a stranded wire, the core wire is gathered without spreading and securely held between the locking spring and the terminal plate be able to.
[0036]
The invention according to claim 5 is the invention according to claim 1, wherein a knurled portion in which unevenness is alternately repeated in the introduction direction of the electric wire is formed in the contact portion of the terminal plate with the electric wire. The foreign matter adhering to the surface of the electric wire can be removed by the unevenness, and the electrical connection state between the terminal plate and the electric wire becomes good. In addition, since the guide protrusion is provided to restrict the portion through which the electric wire passes, the knurled portion may be formed within the restricted range, and the area of the knurled portion can be reduced.
[0037]
According to a sixth aspect of the present invention, in the first aspect of the present invention, a guard piece protrudes along a side edge of the locking piece on the surface of the terminal plate that contacts the electric wire. By providing, it is possible to prevent the electric wire from being inserted into an unnecessary part. Moreover, since the site | part through which an electric wire passes is controlled by a guard piece, even if the electric wire whose core wire is a stranded wire, the expansion of an electric wire can be controlled and an electric wire can be hold | maintained between a locking spring and a terminal plate. That is, even with an electric wire having a stranded wire as a core wire, the wire connection work can be performed only by inserting the electric wire into the electric wire insertion hole provided in the body.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
2A and 2B show a terminal plate used in the above, wherein FIG. 2A is a plan view and FIG. 2B is a longitudinal sectional view.
FIG. 3 is a longitudinal sectional view of the same.
FIGS. 4A to 4C are cross-sectional views showing an example of a terminal plate used for the above. FIG.
FIG. 5 is an exploded perspective view showing another configuration example of the above.
6A and 6B show a terminal board used in the configuration example shown in FIG. 5, wherein FIG. 6A is a plan view and FIG. 6B is a longitudinal sectional view.
FIG. 7 is an exploded perspective view showing a switch using the same as above.
8A and 8B show a switch using the same as above, FIG. 8A is a front view, FIG. 8B is a bottom view, and FIG. 8C is a side view.
FIG. 9 is a longitudinal sectional view of a switch using the same as above.
FIG. 10 is an exploded perspective view showing another switch using the same as above.
11A and 11B show another switch using the same, wherein FIG. 11A is a front view, FIG. 11B is a bottom view, and FIG. 11C is a side view.
FIG. 12 is a longitudinal sectional view of another switch using the above.
13A and 13B show a terminal board used in a conventional example, where FIG. 13A is a plan view and FIG. 13B is a longitudinal sectional view.
[Explanation of symbols]
1 body
2 Electric wires
12 Wire insertion hole
31, 32 Terminal board
33 Locking spring
33b chain lock
36 Knurling
38 Guide projection
39 Guard pieces
45,46 terminal board

Claims (6)

電気器具の器体に貫設した電線挿入孔を通して器体に導入された電線に接触する端子板と、端子板に向かってばね付勢され端縁を前記電線に弾接させることにより端子板との間で前記電線を挟持する鎖錠片を有した鎖錠ばねとを備え、端子板において前記電線を接触させる面には、前記電線の挿入方向に交わる方向において、中央部に導入された前記電線を鎖錠片との間に挟持する部位の両側であって、電線挿入孔から芯線が撚り線である電線を導入して当該電線がばらばらに広がった場合に当該電線を鎖錠片との間に挟持する部位に一対の案内突部が突設されていることを特徴とする端子装置。A terminal plate that comes into contact with the electric wire introduced into the container through an electric wire insertion hole provided in the container of the electric appliance, and a terminal plate that is spring-biased toward the terminal plate and elastically contacts the end edge with the electric wire. A locking spring having a locking piece for sandwiching the electric wire therebetween, and the surface of the terminal plate that contacts the electric wire is introduced into the central portion in the direction intersecting the insertion direction of the electric wire. When both sides of the part that clamps the electric wire between the locking pieces and the core wire is introduced from the electric wire insertion hole and the electric wires spread apart, the electric wire is connected to the locking piece. A terminal device characterized in that a pair of guide projections project from portions sandwiched therebetween . 前記案内突部において少なくとも互いに近い側の端部が球面状に形成されていることを特徴とする請求項1記載の端子装置。  The terminal device according to claim 1, wherein at least end portions close to each other in the guide protrusion are formed in a spherical shape. 前記案内突部が前記鎖錠片の端縁の一部に対向する位置に形成されていることを特徴とする請求項1記載の端子装置。  The terminal device according to claim 1, wherein the guide protrusion is formed at a position facing a part of an edge of the locking piece. 一対の前記案内突部が前記電線の先端側に向かって互いの距離を小さくする形で配置されていることを特徴とする請求項1記載の端子装置。  The terminal device according to claim 1, wherein the pair of guide protrusions are arranged in such a manner that the distance from each other decreases toward the distal end side of the electric wire. 前記端子板において前記電線との接触部位には電線の導入方向おいて凹凸が交互に繰り返すローレット部が形成されていることを特徴とする請求項1記載の端子装置。  2. The terminal device according to claim 1, wherein a knurled portion in which irregularities are alternately repeated in a direction in which the electric wire is introduced is formed at a contact portion of the terminal plate with the electric wire. 前記端子板において前記電線を接触させる面には前記鎖錠片の側縁に沿ってガード片が突設されていることを特徴とする請求項1記載の端子装置。 Terminal equipment according to claim 1, wherein the guard member along a side edge of the locking piece on the surface contacting the wire in the terminal plate are projected.
JP2000348763A 2000-11-15 2000-11-15 Terminal equipment Expired - Fee Related JP3674497B2 (en)

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JP3674497B2 true JP3674497B2 (en) 2005-07-20

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JP6019092B2 (en) * 2014-12-08 2016-11-02 リズム協伸株式会社 Wire connector

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