JP3668851B2

JP3668851B2 - Safety switch

Info

Publication number: JP3668851B2
Application number: JP14779693A
Authority: JP
Inventors: ▲いく▼夫渋谷
Original assignee: 三明電機株式会社
Priority date: 1993-06-18
Filing date: 1993-06-18
Publication date: 2005-07-06
Anticipated expiration: 2020-07-06
Also published as: JPH076663A

Description

【０００１】
【産業上の利用分野】
本発明はトランスファマシン等において、刃具交換，修理点検作業，あるいは品質チェック作業等の安全を確保するため、装置周囲に設置する安全カバー，扉，安全柵などとインターロックをとって、前記各作業に際しては、安全カバー等の開放は可能とするが、機械装置の各駆動部は起動不能に維持する安全スイッチに関する。
【０００２】
【従来の技術】
従来、この種の安全スイッチとしては、例えば特開昭６４−１４８３４号公報に開示されたものがあり、この発明は図１１に示すように、スイッチユニット６１はケース６２とヘッド６３を具備し、両者はネジ６４，６５，６６により連結してあって、ケース６２に対しヘッド６３の向きを変更可能としてある。また、安全カバー等に取付けたキー６７をロック及び解除する縦形のスライドロッド６８は、下端に取付けた水平状の結合部６９を介して、ケース６２内のスイッチ装置７０を作動させるプッシュロッド７１と連結され、該プッシュロッド７１を上下させるカム７２は、ヘッド６３のほぼ中央側に回転可能に位置させてあるので、スライドロッド６８はヘッド６３の中心部ではなく、側方に偏った位置にある。
【０００３】
【発明が解決しようとする課題】
この従来の安全スイッチの構成では、キー６７をロック又は解除するスライドロッド６８は、スイッチユニット６１の中心部に位置していないため、スイッチユニット６１に対するキーの挿入位置が限定され、適用し得る安全カバー，安全扉等は１個となって利用範囲が狭く、また、場合によっては安全カバー等の位置に応じてネジ６４〜６７を外してヘッド６３の向きを変更せねばならないので、手間がかかる等の問題がある。
【０００４】
更に、スイッチユニット６１に挿入されてスライドロッド６８によりロックされたキー６７は、該スライドロッド６８を下方へ押し下げることにより、ロックを解除する構成であるから、スライドロッド６８を作動させる機構に誤作動を生じた場合、機械部分の運転中に安全カバー等が開放されるというような危険を生ずる可能性がある。
【０００５】
本発明は、前記課題を解決するものであって、複数個の安全カバー等に同時に適用でき、取付け自由度が大きいとともに、誤作動による安全カバー等の開放を生じないような安全スイッチを提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、
本発明の安全スイッチは、
スイッチ本体と、持込みキーと、機械装置周囲の壁体に取付けられ、前記スイッチ本体に対して挿通及び引抜き可能な操作キーとからなり、
前記スイッチ本体は、
前記持込みキーによって回動される円弧カムを有するとともに、当該スイッチ本体に対する前記持込みキーの挿通、回動及び引抜きを可能にするとともに該持込みキーの引抜きを不可能にするよう構成される係止部材と、
通電の有無に基づき前記円弧カムを固定及び解放する制御装置と、
前記円弧カムの回動に応じて前記操作キーのロック及び解除を行うロック部材と、
前記円弧カムの回動に応じて前記機械装置の各駆動部を起動及び起動不能にするスイッチ装置と
を備え、
ａ．前記制御装置へ通電すると、該制御装置は前記円弧カムを解放し、
ｂ．該円弧カムの解放時、前記持込みキーを所定角度だけ所定方向へ回動すると、前記円弧カムは前記所定角度だけ前記所定方向へ回動して該角度位置に保持され、
該円弧カムの回動により、前記ロック部材は前記操作キーのロック解除位置に移動して該操作キーは前記スイッチ本体から引抜き可能になるとともに前記スイッチ装置は前記機械装置の各駆動部を起動不能にする位置に移動して該各駆動部は起動不能になり、
かつ、前記持込みキーは前記係止部材により前記スイッチ本体から引抜き可能となり、
ｃ．前記持込みキーを前記スイッチ本体から引抜くとともに前記操作キーを前記スイッチ本体から引抜き、前記機械装置に対する点検修理等が行われた後、
ｄ．前記操作キーを前記スイッチ本体に挿通した状態で、前記持込みキーを前記スイッチ本体に挿通し、該持込みキーを前記所定方向とは反対方向へ前記所定角度だけ回動すると、前記円弧カムは前記所定角度だけ該反対方向へ回動して元の角度位置に戻り、
該円弧カムの回動により、前記ロック部材は前記操作キーのロック位置に移動して該操作キーは前記スイッチ本体に固定されるとともに前記スイッチ装置は前記機械装置の各駆動部を起動する位置に移動して該各駆動部は起動し、
かつ、前記持込みキーは前記係止部材により前記スイッチ本体から引抜き不可能となり、
ｅ．その後、前記制御装置への通電を止めると、該制御装置は、前記円弧カムを元の角度位置に固定し、該円弧カムの固定により前記持込みキーを回動できなくする
ことを特徴とする。
また、本発明の他の安全スイッチは、
スイッチ本体と、持込みキーと、機械装置周囲の壁体に取付けられ、前記スイッチ本体に対して挿通及び引抜き可能な操作キーとからなり、
前記スイッチ本体は、
前記持込みキーによって回動される円弧カムを有するとともに、当該スイッチ本体に対する前記持込みキーの挿通、回動及び引抜きを可能にするとともに該持込みキーの引抜きを不可能にするよう構成される係止部材と、
通電の有無に基づき前記円弧カムを固定及び解放する制御装置と、
前記円弧カムの回動及び前記制御装置の作動に応じて前記操作キーのロック及び解除を行うロック部材と、
前記円弧カムの回動及び前記制御装置の作動に応じて前記機械装置の各駆動部を起動及び起動不能にするスイッチ装置と
を備え、
ａ．前記制御装置へ通電すると、該制御装置は、前記円弧カムを解放するとともに前記ロック部材を前記操作キーのロック解除位置に移動させて該操作キーを前記スイッチ本体から引抜き可能にし、かつ、前記スイッチ装置を前記機械装置の各駆動部を起動不能にする位置に移動させて該各駆動部を起動不能にし、
ｂ．前記制御装置への通電中、前記持込みキーを所定角度だけ所定方向へ回動すると、前記円弧カムは前記所定角度だけ前記所定方向へ回動して該角度位置に保持され、該円弧カムは、前記制御装置への通電を止めても、前記ロック部材を前記操作キーのロック解除位置に保持して該操作キーを前記スイッチ本体から引抜き可能に保ち、かつ、前記スイッチ装置を前記機械装置の各駆動部を起動不能にする位置に保持して該各駆動部を起動不能に保ち、
かつ、前記持込みキーは前記係止部材により前記スイッチ本体から引抜き可能となり、
ｃ．前記持込みキーを前記スイッチ本体から引抜くとともに前記操作キーを前記スイッチ本体から引抜き、前記機械装置に対する点検修理等が行われた後、
ｄ．前記操作キーを前記スイッチ本体に挿通した状態で、前記持込みキーを前記スイッチ本体に挿通し、該持込みキーを前記所定方向とは反対方向へ前記所定角度だけ回動すると、前記円弧カムは前記所定角度だけ該反対方向へ回動して元の角度位置に戻り、
ｅ．その後、前記制御装置への通電を止めると、該制御装置は、前記ロック部材を前記操作キーのロック位置に移動させて該操作キーを前記スイッチ本体に固定し、かつ、前記スイッチ装置を前記機械装置の各駆動部を起動する位置に移動させて該各駆動部を起動し、さらに、前記円弧カムを元の角度位置に固定し、該円弧カムの固定により前記持込みキーを回動できなくし、
かつ、前記持込みキーは前記係止部材により前記スイッチ本体から引抜き不可能となる
ことを特徴とする。
【０００９】
【実施例】
以下、操作キーを２組とした場合の実施例について図面を参照して説明すると、図１〜７において、安全スイッチの四角柱状のスイッチ本体１の中心位置には、その長手方向の軸線を中心線とする段付の案内孔２が設けてあり、これにロック部材３の円柱状の本体４が摺動自在に挿通してある。
【００１０】
該ロック部材３は本体４上部に続くフランジ５を有し、その下面と前記段付部との間には、ロック部材３を上方へ付勢するコイルばね６が装着してあり、また、案内孔２の上部側には、後記する操作キー３０，３０、挿通用のキー通路７，８が互いに直交して水平に上下隣接して形成してある（図３参照）。
【００１１】
ロック部材３の下部には、スイッチ装置９がスイッチ本体１に形成した空間１０内に位置して設けてあり、スイッチ装置９は、スイッチ本体１に保持される固定部１１と、ロック部材３に連結棒１２を介して取付けた昇降部１３を有し、固定部１１には、上下に端子１４，１５が配設してあり、かつ、昇降部１３には端子１４，１５に対するスイッチ本体１６が取付けてある。このスイッチ装置９は、操作キー３０のロック及びその解除のためにのロック部材３の摺動作動に連動する昇降部１３の昇降により、そのスイッチ本体１６が固定部１１の端子１４，１５に交互に接触し、図示されない機械装置の駆動部回路を開閉するようになっている。
【００１２】
ロック部材３のフランジ５上部中央には、両操作キー３０と係合してこれらを係止するロック部１７が設けてあり、これはキー通路７，８の幅より小さい直径の円柱より形成してある。
【００１３】
そして、スイッチ本体１の上部側であるロック部材３上方のケース１８には、ロック部材３と同心とされたピン孔１８ａが形成してあり、該ピン孔１８ａには従動ピン１９が摺動自在に挿通させてある。また、ケース１８内の中央上部側にピン孔１８ａに連通して形成された空洞部２１を有し、空洞部２１には、水平の軸孔２２が形成してある。
【００１４】
更に、空洞部２１内には、カム軸２３を該軸孔２２に軸支された円弧カム２４が回動自在に支持されており、円弧カム２４のカム外形面には、従動ピン１９先端がコイルばね６の弾発力によりロック部材３を介して常時当接させてある。
【００１５】
カム軸２３の中心部には、図２に示すように円弧カム２４のカム頂点と軸孔２２の中心とを結ぶ線に並行に溝２５が形成してあり、これに対し軸孔２２にも図４，５に示すように、前記溝２５に続く溝２６，２６が垂直方向として対向形成してある。これら溝２５，２６は、図３に示す持込みキー２７を挿通可能な形状，寸法としてあり、２９は持込みキー２７を溝２５，２６に挿通して回動させた場合、持込みキー２７先端の係止凸部２８の回転通路を形成するために、軸孔２２外周側に設けられる環状溝である。
【００１６】
そして、図５に示すように、カム軸２３を持込みキー２７により回転させて、その溝２５と溝２６，２６を一致させるとき、これによる円弧カム２４の回動により、従動ピン１９を介してロック部材３が押下げられて下降位置（操作キー３０の解除位置）となる。このカム軸２３を時計方向に９０度回転すると図４の状態となり、ロック部材３はコイルばね６の弾発力により上昇位置（操作キー３０のロック位置）となり、溝２５と溝２６，２６は一直線上になく、挿通された持込みキーの抜き出しは不能となる。
【００１７】
図７はキー通路７，８に挿通可能とされた操作キー３０を示すもので、その挿通側に図６に示すように、従動ピン１９は挿通可能とするが、ロック部１７は通過できない幅の切込み溝３１が形成してある。更に、操作キー３０をそれぞれキー通路７，８に挿通して所定の位置としたとき、ロック部１７に対応する切込み溝３１部に、該ロック部１７を挿通自在とする対向した半月形部よりなる係止部３２が形成してあり、３０ａは安全カバー等の壁体Ａへの取付孔である。
【００１８】
また、スイッチ本体１のケース１８上に設けたケース３３には、ロック位置とされた係止部材２０を固定及び開放可能とする制御装置３４が連設してあり、該制御装置３４は実施例ではケース３３に装着したソレノイド３５に導線３６，３７により中心に位置されたプランジャ３８を上下させる電気方式の場合で、図示されないボルト等でケース１８へ取付けた同様なケース３３に設けた下部側のストッパ３９により、上下摺動可能に保持させてある。そして、ケース３３の上部側のストッパ４０との間に介装したコイルばね４１により、該プランジャ３８は常時は下方のストッパ３９側へ付勢されて下部位置にあり、ソレノイド３５への通電により、コイルばね４１の弾発力に抗して図３に示す上部位置へ移行保持される構成としてある。
【００１９】
このプランジャ３８の中心には、段付のロックピン４２が固定してあり、ストッパ３９側である小径部は、プランジャ３８が下部位置に保持されているときは、ストッパ３９より下方へ突出して図２，４に示すように、操作キー３０のロック位置にある係止部材２０のカム面に形成した係止孔４３に嵌入し、該係止部材２０を固定可能としてある。
【００２０】
また、ロックピン４２のストッパ４０側である大径部は、該ストッパ４０に摺動可能に保持され、ソレノイト３５への通電によりプランジャ３８が上昇したとき、前記大径部は上蓋４４に設けた孔部４５へ進入可能とされ、この作動によりロックピン４２の前記小径部側は係止部材２０の係止孔４３から抜け出て係止部材２０が開放される。４６は支柱等のフレームＢへの取付け用としてスイッチ本体１へ設けた取付け孔、４７は空洞部２１に設けた円弧カム２４のストッパ、４８はスイッチカバー、４９，５０はスイッチ本体１と各ケース１８，３３等の接続部においてソレノイド３５用導線３６，３７を連結するプラグとジャックで、導線３６，３７の基端は図示されない操作盤のスイッチへ接続可能としてある。
【００２１】
このように構成された安全スイッチにおいて、所定の機械装置部を遮蔽する安全カバー等の壁体Ａの交差部におけるフレームＢにスイッチ本体１を取付け、操作盤のスイッチを入れて導線３６，３７を経てソレノイド３５へ通電すると、プランジャ３８が上昇してストッパ４０に当接し、ロックピン４２が上昇位置となる。これで該ロックピン４２の小径部が円弧カム２４の係止孔４３より抜け出てこれを開放する。
【００２２】
ここで、持込みキー２７によりカム軸２３を回転させてその溝２５と軸孔２２の溝２６，２６とを一致させると、円弧カム２４によりロック部１７が従動ピン１９を介して押し下げられ、操作キー３０の解除位置へ達してキー通路７，８を開放する。同時に上記ロック部１７の下降に連動して昇降部１３も下降し、スイッチ体１６により端子１４側が断となるとともに、端子１５側が接続し、機械装置の各駆動部回路が開いて起動不能となる。なお、この状態では係止孔４３がロックピン４２の作動線上より外れているので、ソレノイド３５への通電が断となってもロックピン４２は下降できない。
【００２３】
この状態で作業者が各壁体Ａを閉じると、それぞれに所定の状態として取付けてある各操作キー３０は、開放されているそれぞれのキー通路７，８へ挿通され、各係止部３２は図６に示すように、ロック部１７直上へ位置される。
【００２４】
次に、持込みキー２７によりカム軸２３を時計方向へ回動させると、円弧カム２４は図２，４の状態となり、これに連動してロック部材３はコイルばね６の弾発力により従動ピン１９を伴って上昇して操作キー３０のロック位置へ達し、ロック部１７は図１，２に示すように、両操作キー３０の係止部３２中へ挿通され、操作キー３０は該ロック部１７に係止されて引抜き不能となり、両壁体Ａは開放できなくなる。
【００２５】
同時に前記円弧カム２４の回動により、その係止孔４３がロックピン４２の作動線上へ復帰するので、この時点で操作盤のスイッチによりソレノイド３５へ通電を切ると、コイルばね４１によりプランジャ３８と共にロックピン４２が下降し、これらはストッパ３９により停止するとともに、前記小径部は係止孔４３中へ嵌入し、円弧カム２４を固定する。
【００２６】
同時に前記ロック部材３の上昇に連動してスイッチ装置９の昇降部１３も上昇し、スイッチ体１６により端子１５側が断となるとともに端子１４側が接続され、各駆動部が起動可能となって所定の加工作業が開始される。この状態で持込みキー２７は、カム軸２３の溝２５が溝２６，２６に対し、ずれた位置となっているので（図４）、抜き出し不能でスイッチ本体１に係止保持される。
【００２７】
機械装置の修理点検等の場合は、前記したようにソレノイド３５へ通電してプランジャ３８によりロックピン４２を上昇させると、その小径部が係止孔４３より抜け出て円弧カム２４が自由となる。
【００２８】
その後、挿通させてある持込みキー２７を反時計方向へ回動して図５の状態にすると、ロック部１７は従動ピン１９を介して下降して解除位置となり、キー通路７，８を開放する。これで各操作キー３０のロックが解除され、同時に前記同様スイッチ装置９が切換えられ、各駆動部は起動できなくなる。そこで、操作者は、持込みキー２７をカム軸２３より引抜いて携行し、壁体Ａを開いて内部へ入り、所定の作業を行なう。
【００２９】
図８〜１０は、本発明の他の実施例を示すもので、前記実施例と同様なロック部材３及びスイッチ装置９を備えたスイッチ本体１の上部に、前記制御装置３４を上下反対の構成とした制御装置３４Ａを位置させてある。
【００３０】
すなわち、ケース３３Ａのストッパ４０Ａ側をスイッチ本体１のロック部材３へ位置させ、ロックピン４２Ａの大径部下端をロック部１７上へ当接させるとともに、小径部をストッパ３９Ａを貫通して常時はコイルばね４１Ａにより上方へ突出させてある。なお、ロックピン４２Ａの前記大径部は、従動ピン１９の場合と同様に操作キー３０の切込み溝３１を通過可能な直径のものとしてある。
【００３１】
そして、ソレノイド３５Ａの通電によりプランジャ３８Ａはロックピン４２を伴って下降し、ロックピン４２Ａの大径部はロック部１７を押し下げるととともに、小径部はストッパ３９Ａ内に退行する。
【００３２】
また、制御装置３４Ａの上方には、第１実施例の係止部材２０とほぼ同様な係止部材５１が連設してあり、該係止部材５１は前記同様のケース５２を有し、ケース５２内には、ストッパ３９Ａ上面に開口する空洞部５３が形成してある。空洞部５３には水平の軸孔５４が形成され、該軸孔５４にカム軸５５を軸支された円弧カム５６が空洞部５３内に回動自在に挿入されている。
【００３３】
円弧カム５６のカム面には、前記ロックピン４２Ａの小径部が嵌入可能な係止孔５７が対応して形成してあり、また、カム軸５５及び軸孔５４には、前記同様に溝５８，及び５９，５９がそれぞれ形成してあり、持込みキー２７を挿通可能とそてあり、６０は軸孔５４面に設けられる環状溝である。
【００３４】
以上の構成の実施例では、まず、導線３６，３７を経てソレノイド３５Ａへ通電すると、プランジャ３８Ａと共にロックピン４２Ａが下降し、その小径部がストッパ３９Ａ内へ退行するとともに、大径部がロック部１７を押し下げてキー通路７，８を開放し、図１０に示す操作キー３０のロック解除位置となる。これに連動して前記同様にスイッチ装置９が切換えられて機械装置の各駆動部が起動不能となる。この状態で持込みキー２７を前記同様にしてカム軸５５へ挿通し、円弧カム５６を回動させてその係止孔５７をロックピン４２Ａの作動線上へ移し、その後、持込みキー２７を引抜くと、ロック部材３は、ソレノイド３５Ａへの通電が誤作動により断となっても上昇できず、前記解除位置に維持される。
【００３５】
次いで、作業者が各壁体Ａを閉じると、各操作キー３０は前記同様にキー通路７，８へ挿通される。続いて、持込みキー２７をカム軸５５へ挿通して、円弧カム５６を回動させ、その係止孔５７をロックピン４２Ａの作動線上へ位置させると、持込みキー２７は引抜き不可となる。
【００３６】
その後、ソレノイト３５Ａへの通電を断とすると、ロックピン４２Ａはコイルばね４１Ａの弾発力によりプランジャ３８Ａと共に上昇し、その小径部が復帰した係止部材５１の係止孔５７へ挿通され、これにより、該係止部材５１はこの状態に固定される。また、ロックピン４２Ａの上昇に追従してロック部材３はコイルばね６により上昇して操作キー３０のロック位置へ達し、ロック部１７が操作キー３０の係止部３２へ挿通されて該操作キー３０がロックされ、壁体Ａは開放できない。更に、ロック部材３の上昇に連動してスイッチ装置９が切換えられ、各駆動部が前記同様に起動可能となる。
【００３７】
機械装置の修理点検等の場合は、ソレノイド３５Ａへ通電してプランジャ３８Ａ，ロックピン４２Ａを下降させ、ロック部１７を押し下げてロック解除位置へ保持してキー通路７，８を開放する。これで操作キー３０は引抜き可能となって壁体Ａが開放できる。同時にスイッチ装置９の回路が上記と逆に切換えられ、各駆動部は起動不可となるとともに、ロックピン４２Ａの小径部が係止孔５７より抜け出て係止部材５１は自由となる。
【００３８】
そこで、挿通されている持込みキー２７により円弧カム５６を回して係止孔５７をロックピン４２Ａの作動線外へ位置させてロックピン４２Ａを上昇不能としておいて、該持込みキー２７を引抜き、携行して所定の点検作業を行なう。
【００３９】
なお、ロック部１７は円柱状としてあるが、角柱その他の形状としてもよく、また、制御装置は電気式であるが、流体圧作動によるシリンダ方式とすることもでき、更に、適用壁体は、一面，三面，四面等の場合にも利用できることはもちろんである。
【００４０】
また、各導線の接続は、スイッチ本体のそれぞれの区画部において、プラグ，ジャック方式で簡単に行なえるので、スイッチ本体等の組み立ては容易であるとともに、各導線は内蔵されるので断線等の事故の心配はなく、かつ、製作上，取扱上等の都合により、スイッチ本体を適宜の分割構成とすることもできる。
【００４１】
【発明の効果】
以上の説明より明らかなように、本発明はロック部材をスイッチ本体の中心に位置させてあるので、多方向より同条件で操作キーを挿通できて複数の機械装置に対し安全カバー，扉等のロック制御を一個の安全スイッチで処理できるので、極めて効率がよく、かつ一台の機械装置でも二面の安全カバー等がロック制御できて修理点検等に便利であり、更に、取付けの自由度が大であるから、種々の状態に対応でき、機械装置以外の諸般の設備部門にも適用可能である。
【００４２】
また、係止部材を持込みキーにより操作することにより、現場の機械装置周辺において安全カバー等の開閉及びこれと関連する駆動部の起動、停止が制御可能であるとともに、係止部材の固定及び解除を行なう制御装置を操作盤側において制御可能とするロック制御構成であるから、機械運転中に安全カバーが開くというような誤作動は生ずることがない。
【図面の簡単な説明】
【図１】安全スイッチのロック状態における縦断面図である。
【図２】図１のII−II線による縦断面図である。
【図３】安全スイッチのロック解除の状態における縦断面図である。
【図４】ロック状態におけるスイッチ本体上部の側面図である。
【図５】ロック解除状態におけるスイッチ本体上部の側面図である。
【図６】図２のVI−VI線によるスイッチ本体上部の平面図である。
【図７】操作キーの側面図である。
【図８】本発明の他の実施例を示すロック状態における一部切欠正面図である。
【図９】図８のIX−IX線による一部切欠側面図である。
【図１０】ロック解除の状態における一部切欠正面図である。
【図１１】従来の安全スイッチの一部切欠斜視図である。
【符号の説明】
Ａ壁体
１スイッチ本体
３ロック部材
９スイッチ装置
２０，５１係止部材
２４，５６円弧カム
２７持込みキー
３０操作キー
３４，３４Ａ制御装置[0001]
[Industrial application fields]
In the transfer machine, etc., in order to ensure safety such as blade replacement, repair inspection work, quality check work, etc., the safety cover, door, safety fence, etc. installed around the device are interlocked, and each of the above work At this time, the present invention relates to a safety switch that allows the safety cover and the like to be opened, but keeps each drive unit of the mechanical device from being activated.
[0002]
[Prior art]
Conventionally, as this type of safety switch, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 64-14834. As shown in FIG. 11, the switch unit 61 includes a case 62 and a head 63. Both are connected by screws 64, 65, 66, and the direction of the head 63 can be changed with respect to the case 62. A vertical slide rod 68 for locking and releasing the key 67 attached to the safety cover or the like is provided with a push rod 71 for operating the switch device 70 in the case 62 via a horizontal coupling portion 69 attached to the lower end. Since the cam 72 that is connected and moves the push rod 71 up and down is rotatably positioned substantially at the center side of the head 63, the slide rod 68 is not at the center of the head 63 but at a side biased position. .
[0003]
[Problems to be solved by the invention]
In this conventional safety switch configuration, the slide rod 68 that locks or releases the key 67 is not located at the center of the switch unit 61, so that the key insertion position with respect to the switch unit 61 is limited and applicable safety is possible. The cover, safety door, etc. become one and the range of use is narrow, and in some cases, the direction of the head 63 must be changed by removing the screws 64 to 67 according to the position of the safety cover, etc., which takes time. There are problems such as.
[0004]
Furthermore, since the key 67 inserted into the switch unit 61 and locked by the slide rod 68 is configured to release the lock by pushing down the slide rod 68, the mechanism for operating the slide rod 68 is malfunctioning. If this occurs, there is a risk that a safety cover or the like may be opened during operation of the machine part.
[0005]
The present invention solves the above-described problems, and provides a safety switch that can be applied to a plurality of safety covers at the same time, has a high degree of freedom in attachment, and does not cause the safety cover to be opened due to a malfunction. For the purpose.
[0006]
[Means for Solving the Problems]
To achieve the above objective,
The safety switch of the present invention is
A switch body, a carry-in key, and an operation key that is attached to a wall around the mechanical device and can be inserted into and removed from the switch body.
The switch body is
A locking member having an arc cam rotated by the carry-in key and configured to allow insertion, rotation, and extraction of the carry-in key with respect to the switch body, and to make it impossible to remove the carry-in key. When,
A control device for fixing and releasing the arc cam based on the presence or absence of energization;
A lock member that locks and releases the operation key according to the rotation of the arc cam;
A switch device that activates and disables activation of each drive unit of the mechanical device in response to rotation of the arc cam;
With
a. When energizing the control device, the control device releases the arc cam,
b. When releasing the arc cam, if the carry key is rotated in a predetermined direction by a predetermined angle, the arc cam is rotated in the predetermined direction by the predetermined angle and held at the angular position.
As the arc cam rotates, the lock member moves to the unlocking position of the operation key so that the operation key can be pulled out of the switch body and the switch device cannot start each drive unit of the mechanical device. Each drive unit becomes inoperable by moving to the position
And the carry-in key can be pulled out from the switch body by the locking member,
c. After pulling out the carry-in key from the switch body and pulling out the operation key from the switch body, after the inspection and repair etc. for the mechanical device is performed,
d. When the operation key is inserted into the switch body, the carry key is inserted into the switch body, and the carry key is rotated in the direction opposite to the predetermined direction by the predetermined angle, the arc cam is Rotate in the opposite direction by an angle and return to the original angular position,
By the rotation of the arc cam, the lock member moves to the lock position of the operation key, the operation key is fixed to the switch body, and the switch device is in a position to activate each drive unit of the mechanical device. Each drive unit is activated by moving,
And, the carry-in key cannot be pulled out from the switch body by the locking member,
e. Thereafter, when energization of the control device is stopped, the control device fixes the arc cam at the original angular position, and the carry key cannot be rotated by fixing the arc cam.
It is characterized by that.
In addition, another safety switch of the present invention is
A switch body, a carry-in key, and an operation key that is attached to a wall around the mechanical device and can be inserted into and removed from the switch body.
The switch body is
A locking member having an arc cam rotated by the carry-in key and configured to allow insertion, rotation, and extraction of the carry-in key with respect to the switch body, and to make it impossible to remove the carry-in key. When,
A control device for fixing and releasing the arc cam based on the presence or absence of energization;
A lock member that locks and releases the operation key according to the rotation of the arc cam and the operation of the control device;
A switch device that activates and disables activation of each drive unit of the mechanical device according to rotation of the arc cam and operation of the control device;
With
a. When the control device is energized, the control device releases the arc cam and moves the lock member to the unlock position of the operation key so that the operation key can be pulled out of the switch body , and the switch The device is moved to a position where each drive unit of the mechanical device cannot be activated to disable each drive unit,
b. When the carry key is rotated in a predetermined direction by a predetermined angle during energization of the control device, the arc cam is rotated in the predetermined direction by the predetermined angle and held at the angular position. Even when energization of the control device is stopped, the lock member is held in the unlocked position of the operation key to keep the operation key detachable from the switch body, and the switch device is provided for each of the mechanical devices. Hold the drive unit in a position where it cannot be activated, and keep each drive unit inactivated,
And the carry-in key can be pulled out from the switch body by the locking member,
c. After pulling out the carry-in key from the switch body and pulling out the operation key from the switch body, after the inspection and repair etc. for the mechanical device is performed,
d. When the operation key is inserted into the switch body, the carry key is inserted into the switch body, and the carry key is rotated in the direction opposite to the predetermined direction by the predetermined angle, the arc cam is Rotate in the opposite direction by an angle and return to the original angular position,
e. Thereafter, when energization of the control device is stopped, the control device moves the lock member to the lock position of the operation key to fix the operation key to the switch body, and the switch device is moved to the machine. Each drive unit of the device is moved to a starting position to start each drive unit, and the arc cam is fixed at the original angular position, and the carry-in key cannot be rotated by fixing the arc cam,
In addition, the carry-in key cannot be pulled out from the switch body by the locking member.
It is characterized by that.
[0009]
【Example】
Hereinafter, an embodiment in which two sets of operation keys are provided will be described with reference to the drawings. In FIGS. 1 to 7, the center position of the rectangular columnar switch body 1 of the safety switch is centered on the longitudinal axis. A stepped guide hole 2 serving as a line is provided, and a columnar main body 4 of the lock member 3 is slidably inserted therethrough.
[0010]
The lock member 3 has a flange 5 continuing from the upper portion of the main body 4, and a coil spring 6 for urging the lock member 3 upward is mounted between the lower surface of the lock member 3 and the stepped portion. On the upper side of the hole 2, operation keys 30 and 30 and insertion key passages 7 and 8 to be described later are formed perpendicularly and vertically adjacent to each other (see FIG. 3).
[0011]
Below the lock member 3, the switch device 9 is provided in a space 10 formed in the switch body 1, and the switch device 9 is provided with a fixing portion 11 held by the switch body 1 and the lock member 3. It has an elevating part 13 attached via a connecting rod 12, terminals 14 and 15 are arranged on the upper and lower parts of the fixed part 11, and a switch body 16 for the terminals 14 and 15 is provided on the elevating part 13. It is installed. The switch device 9 is configured such that the switch body 16 is alternately connected to the terminals 14 and 15 of the fixing portion 11 by raising and lowering the raising and lowering portion 13 interlocked with the sliding operation of the lock member 3 for locking the operation key 30 and releasing the operation key 30. The drive circuit of a mechanical device (not shown) is opened and closed.
[0012]
In the center of the upper portion of the flange 5 of the lock member 3, there is provided a lock portion 17 that engages and locks both operation keys 30, which is formed by a cylinder having a diameter smaller than the width of the key passages 7 and 8. It is.
[0013]
A pin hole 18a concentric with the lock member 3 is formed in the case 18 above the lock member 3 on the upper side of the switch body 1, and the driven pin 19 is slidable in the pin hole 18a. Is inserted through. In addition, a hollow portion 21 formed in communication with the pin hole 18 a is provided on the upper center side in the case 18, and a horizontal shaft hole 22 is formed in the hollow portion 21.
[0014]
Further, an arc cam 24 is rotatably supported in the hollow portion 21 so that the cam shaft 23 is pivotally supported by the shaft hole 22, and the tip of the driven pin 19 is provided on the cam outer surface of the arc cam 24. The spring force of the coil spring 6 always abuts through the lock member 3.
[0015]
As shown in FIG. 2, a groove 25 is formed in the center of the cam shaft 23 in parallel with a line connecting the cam apex of the arc cam 24 and the center of the shaft hole 22. As shown in FIGS. 4 and 5, grooves 26 and 26 following the groove 25 are formed to face each other in the vertical direction. These grooves 25 and 26 have shapes and dimensions through which the carry-in key 27 shown in FIG. 3 can be inserted, and reference numeral 29 denotes the engagement of the tip of the carry-in key 27 when the carry-in key 27 is inserted into the grooves 25 and 26 and rotated. This is an annular groove provided on the outer peripheral side of the shaft hole 22 in order to form a rotation passage of the stopper projection 28.
[0016]
Then, as shown in FIG. 5, when the cam shaft 23 is rotated by the carry-in key 27 so that the groove 25 and the grooves 26 and 26 coincide with each other, the rotation of the circular arc cam 24 causes the cam shaft 23 to move through the driven pin 19. The lock member 3 is pushed down to the lowered position (the release position of the operation key 30). When the cam shaft 23 is rotated 90 degrees clockwise, the state shown in FIG. 4 is obtained, and the lock member 3 is moved up by the spring force of the coil spring 6 (the lock position of the operation key 30). It is impossible to remove the inserted key that is not in a straight line.
[0017]
FIG. 7 shows the operation key 30 that can be inserted into the key passages 7 and 8, and the driven pin 19 can be inserted through the insertion side as shown in FIG. 6, but the lock portion 17 cannot pass through. A cut groove 31 is formed. Further, when the operation key 30 is inserted into the key passages 7 and 8 respectively to be in a predetermined position, the opposing half-moon-shaped portion that allows the lock portion 17 to be inserted into the cut groove 31 corresponding to the lock portion 17. The latching | locking part 32 which becomes is formed, 30a is an attachment hole to wall bodies A, such as a safety cover.
[0018]
The case 33 provided on the case 18 of the switch body 1 is connected to a control device 34 that can fix and release the locking member 20 in the locked position. Then, in the case of an electrical system in which a plunger 38 positioned at the center by a conducting wire 36, 37 is moved up and down by a solenoid 35 mounted on the case 33, a lower side provided in a similar case 33 attached to the case 18 with a bolt or the like not shown. The stopper 39 is held so as to be slidable up and down. And by the coil spring 41 interposed between the upper side stopper 40 of the case 33, this plunger 38 is always urged | biased by the lower stopper 39 side, and is in a lower position, and with the electricity supply to the solenoid 35, It is configured to be transferred and held to the upper position shown in FIG. 3 against the elastic force of the coil spring 41.
[0019]
A stepped lock pin 42 is fixed at the center of the plunger 38, and the small diameter portion on the stopper 39 side projects downward from the stopper 39 when the plunger 38 is held at the lower position. 2 and 4, the locking member 20 can be fixed by being fitted into a locking hole 43 formed on the cam surface of the locking member 20 at the lock position of the operation key 30.
[0020]
The large-diameter portion on the stopper 40 side of the lock pin 42 is slidably held by the stopper 40, and when the plunger 38 is raised by energization of the solenoid 35, the large-diameter portion is provided on the upper lid 44. It is possible to enter the hole 45, and by this operation, the small diameter portion side of the lock pin 42 comes out of the locking hole 43 of the locking member 20 and the locking member 20 is opened. 46 is a mounting hole provided in the switch body 1 for mounting to a frame B such as a support column, 47 is a stopper of the arc cam 24 provided in the cavity 21, 48 is a switch cover, 49 and 50 are the switch body 1 and each case. Plugs and jacks connecting the conductors 36 and 37 for the solenoid 35 at connecting portions 18 and 33, etc., and the base ends of the conductors 36 and 37 can be connected to a switch on an operation panel (not shown).
[0021]
In the safety switch configured as described above, the switch body 1 is attached to the frame B at the intersection of the wall body A such as a safety cover that shields a predetermined mechanical device, and the conductors 36 and 37 are connected by turning on the switch on the operation panel. Then, when the solenoid 35 is energized, the plunger 38 rises and comes into contact with the stopper 40, and the lock pin 42 is in the raised position. As a result, the small-diameter portion of the lock pin 42 comes out of the locking hole 43 of the arc cam 24 and opens it.
[0022]
Here, when the cam shaft 23 is rotated by the carry-in key 27 so that the groove 25 and the grooves 26, 26 of the shaft hole 22 coincide with each other, the lock portion 17 is pushed down via the driven pin 19 by the arc cam 24. When the key 30 is released, the key passages 7 and 8 are opened. At the same time, the elevating part 13 is also lowered in conjunction with the lowering of the lock part 17, the terminal body 14 side is cut off by the switch body 16, the terminal 15 side is connected, and each drive part circuit of the mechanical device is opened and cannot be started. . In this state, since the locking hole 43 is disengaged from the operating line of the lock pin 42, the lock pin 42 cannot be lowered even when the energization to the solenoid 35 is cut off.
[0023]
When the worker closes each wall A in this state, each operation key 30 attached to each wall body A in a predetermined state is inserted into each open key passage 7 and 8, and each locking portion 32 is As shown in FIG. 6, the lock unit 17 is positioned directly above.
[0024]
Next, when the camshaft 23 is rotated clockwise by the carry-in key 27, the arc cam 24 is in the state shown in FIGS. 2 and 4, and in conjunction with this, the lock member 3 is driven by the elastic force of the coil spring 6. As shown in FIGS. 1 and 2, the lock portion 17 is inserted into the locking portion 32 of both operation keys 30, and the operation key 30 is moved to the lock portion of the operation key 30 as shown in FIGS. Since it is locked to 17 and cannot be pulled out, both wall bodies A cannot be opened.
[0025]
At the same time, the rotation of the circular arc cam 24 returns the locking hole 43 to the operating line of the lock pin 42. At this time, when the solenoid 35 is energized by the switch on the operation panel, the coil spring 41 and the plunger 38 together. The lock pin 42 is lowered and stopped by the stopper 39, and the small diameter portion is fitted into the locking hole 43 to fix the arc cam 24.
[0026]
At the same time, the raising / lowering part 13 of the switch device 9 is also raised in conjunction with the raising of the lock member 3, the terminal 15 side is disconnected by the switch body 16 and the terminal 14 side is connected, so that each driving part can be activated and predetermined Processing work is started. In this state, since the groove 25 of the cam shaft 23 is shifted from the grooves 26 and 26 (FIG. 4), the carry-in key 27 is locked and held by the switch body 1 without being able to be extracted.
[0027]
In the case of repair and inspection of the mechanical device, as described above, when the solenoid 35 is energized and the lock pin 42 is raised by the plunger 38, the small diameter portion comes out of the locking hole 43 and the arc cam 24 becomes free.
[0028]
After that, when the inserted carry-in key 27 is rotated counterclockwise to the state shown in FIG. 5, the lock portion 17 is lowered via the driven pin 19 to the release position, and the key passages 7 and 8 are opened. . Thus, the lock of each operation key 30 is released, and at the same time, the switch device 9 is switched in the same manner as described above, so that each drive unit cannot be activated. Therefore, the operator pulls the carry-in key 27 from the cam shaft 23 and carries it, opens the wall body A, enters the inside, and performs a predetermined work.
[0029]
8 to 10 show another embodiment of the present invention. The control device 34 is arranged upside down on the upper part of the switch body 1 having the lock member 3 and the switch device 9 similar to those of the embodiment. The control device 34A is positioned.
[0030]
That is, the stopper 40A side of the case 33A is positioned on the lock member 3 of the switch body 1, the lower end of the large-diameter portion of the lock pin 42A is brought into contact with the lock portion 17, and the small-diameter portion is normally passed through the stopper 39A. It protrudes upward by a coil spring 41A. The large diameter portion of the lock pin 42 </ b> A has a diameter that can pass through the cut groove 31 of the operation key 30 as in the case of the driven pin 19.
[0031]
When the solenoid 35A is energized, the plunger 38A descends with the lock pin 42, the large diameter portion of the lock pin 42A pushes down the lock portion 17, and the small diameter portion retracts into the stopper 39A.
[0032]
Further, a locking member 51 that is substantially the same as the locking member 20 of the first embodiment is provided above the control device 34A, and the locking member 51 has a case 52 similar to that described above. A cavity 53 is formed in the opening 52 on the top surface of the stopper 39A. A horizontal shaft hole 54 is formed in the cavity 53, and an arc cam 56 having a cam shaft 55 pivotally supported in the shaft hole 54 is rotatably inserted into the cavity 53.
[0033]
A locking hole 57 into which the small diameter portion of the lock pin 42A can be fitted is formed on the cam surface of the arc cam 56, and the cam shaft 55 and the shaft hole 54 have a groove 58 in the same manner as described above. , 59, 59 are formed, and the carry-in key 27 can be inserted, and 60 is an annular groove provided in the surface of the shaft hole 54.
[0034]
In the embodiment having the above configuration, first, when the solenoid 35A is energized via the conducting wires 36 and 37, the lock pin 42A is lowered together with the plunger 38A, the small diameter portion is retracted into the stopper 39A, and the large diameter portion is the lock portion. 17 is depressed to open the key passages 7 and 8, and the operation key 30 is unlocked as shown in FIG. In conjunction with this, the switch device 9 is switched in the same manner as described above, so that each drive unit of the mechanical device cannot be started. In this state, the carry key 27 is inserted into the cam shaft 55 in the same manner as described above, the arc cam 56 is rotated to move the locking hole 57 onto the operating line of the lock pin 42A, and then the carry key 27 is pulled out. The lock member 3 cannot be raised even if the energization of the solenoid 35A is cut off due to a malfunction, and is maintained at the release position.
[0035]
Next, when the operator closes each wall A, each operation key 30 is inserted into the key passages 7 and 8 as described above. Subsequently, when the carry key 27 is inserted into the cam shaft 55, the arc cam 56 is rotated, and the locking hole 57 is positioned on the operating line of the lock pin 42A, the carry key 27 cannot be pulled out.
[0036]
Thereafter, when the energization to the solenoid 35A is cut off, the lock pin 42A is lifted together with the plunger 38A by the elastic force of the coil spring 41A, and the small diameter portion thereof is inserted into the locking hole 57 of the locking member 51, Thus, the locking member 51 is fixed in this state. Further, following the rise of the lock pin 42A, the lock member 3 is raised by the coil spring 6 to reach the lock position of the operation key 30, and the lock portion 17 is inserted into the locking portion 32 of the operation key 30 so that the operation key. 30 is locked and the wall A cannot be opened. Further, the switch device 9 is switched in conjunction with the rise of the lock member 3, and each drive unit can be activated in the same manner as described above.
[0037]
In the case of repair and inspection of the mechanical device, the solenoid 35A is energized, the plunger 38A and the lock pin 42A are lowered, the lock portion 17 is pushed down and held at the unlocked position, and the key passages 7 and 8 are opened. Thus, the operation key 30 can be pulled out and the wall A can be opened. At the same time, the circuit of the switch device 9 is switched to the reverse of the above, so that each drive unit cannot be activated, and the small diameter portion of the lock pin 42A comes out of the locking hole 57 and the locking member 51 becomes free.
[0038]
Accordingly, the circular cam 56 is rotated by the inserted carry key 27 so that the locking hole 57 is positioned outside the operating line of the lock pin 42A so that the lock pin 42A cannot be raised, and the carry key 27 is pulled out and carried. Then, a predetermined inspection work is performed.
[0039]
The lock portion 17 has a cylindrical shape, but may have a prismatic shape or the like, and the control device is an electric type, but can also be a cylinder type by a fluid pressure operation. Of course, it can also be used in the case of one side, three sides, four sides, etc.
[0040]
In addition, the connection of each conductor can be easily done by plug and jack method in each partition of the switch body, so that the assembly of the switch body etc. is easy, and each conductor is built in, so there is an accident such as disconnection. The switch body can be appropriately divided for convenience in manufacturing and handling.
[0041]
【The invention's effect】
As is clear from the above description, since the locking member is positioned at the center of the switch body in the present invention, the operation key can be inserted under the same condition from multiple directions, and a safety cover, a door, etc. Since the lock control can be handled with a single safety switch, it is extremely efficient, and even with a single machine, the two safety covers can be locked, making it convenient for repairs and inspections. Since it is large, it can cope with various conditions and can be applied to various equipment departments other than machinery.
[0042]
In addition, by operating the locking member with the carry-in key, it is possible to control the opening and closing of the safety cover etc. and the start and stop of the drive unit related to this in the vicinity of the on-site machine device, and to fix and release the locking member the control apparatus because it is controllable as to Carlo click control configuration in the operating panel side to perform an erroneous operation is not caused such that opening the safety cover during the machine operation.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a safety switch in a locked state.
FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.
FIG. 3 is a longitudinal sectional view of the safety switch in an unlocked state.
FIG. 4 is a side view of the upper part of the switch body in the locked state.
FIG. 5 is a side view of the upper part of the switch body in the unlocked state.
6 is a plan view of the upper part of the switch body taken along the line VI-VI in FIG. 2. FIG.
FIG. 7 is a side view of an operation key.
FIG. 8 is a partially cutaway front view in a locked state showing another embodiment of the present invention.
9 is a partially cutaway side view taken along line IX-IX in FIG.
FIG. 10 is a partially cutaway front view in the unlocked state.
FIG. 11 is a partially cutaway perspective view of a conventional safety switch.
[Explanation of symbols]
A wall body 1 switch body 3 lock member 9 switch device 20, 51 locking member
24, 56 carry arcuate cam 27 Key 30 operation keys 34,34A controller

Claims

A switch body, a carry-in key, and an operation key that is attached to a wall around the mechanical device and can be inserted into and removed from the switch body.
The switch body is
A locking member having an arc cam rotated by the carry-in key and configured to allow insertion, rotation, and extraction of the carry-in key with respect to the switch body, and to make it impossible to remove the carry-in key. When,
A control device for fixing and releasing the arc cam based on the presence or absence of energization;
A lock member that locks and releases the operation key according to the rotation of the arc cam;
A switch device that activates and disables activation of each drive unit of the mechanical device in response to rotation of the arc cam;
With
a. When energizing the control device, the control device releases the arc cam,
b. When releasing the arc cam, if the carry key is rotated in a predetermined direction by a predetermined angle, the arc cam is rotated in the predetermined direction by the predetermined angle and held at the angular position.
As the arc cam rotates, the lock member moves to the unlocking position of the operation key so that the operation key can be pulled out of the switch body and the switch device cannot start each drive unit of the mechanical device. Each drive unit becomes inoperable by moving to the position
And the carry-in key can be pulled out from the switch body by the locking member,
c. After pulling out the carry-in key from the switch body and pulling out the operation key from the switch body, after the inspection and repair etc. for the mechanical device is performed,
d. When the operation key is inserted into the switch body, the carry key is inserted into the switch body, and the carry key is rotated in the direction opposite to the predetermined direction by the predetermined angle, the arc cam is Rotate in the opposite direction by an angle and return to the original angular position,
By the rotation of the arc cam, the lock member moves to the lock position of the operation key, the operation key is fixed to the switch body, and the switch device is in a position to activate each drive unit of the mechanical device. Each drive unit is activated by moving,
And, the carry-in key cannot be pulled out from the switch body by the locking member,
e. Thereafter, when energization of the control device is stopped, the control device fixes the arc cam at the original angular position, and the carry key cannot be rotated by fixing the arc cam.
Safety switch characterized by that .

A switch body, a carry-in key, and an operation key that is attached to a wall around the mechanical device and can be inserted into and removed from the switch body,
The switch body is
A locking member having an arc cam rotated by the carry-in key and configured to allow insertion, rotation, and withdrawal of the carry-in key with respect to the switch body, and to make it impossible to remove the carry-in key. When,
A control device for fixing and releasing the arc cam based on the presence or absence of energization;
A lock member that locks and releases the operation key according to the rotation of the arc cam and the operation of the control device;
A switch device that activates and disables activation of each drive unit of the mechanical device in response to rotation of the arc cam and operation of the control device;
With
a. When the control device is energized, the control device releases the arc cam and moves the lock member to the unlock position of the operation key so that the operation key can be pulled out from the switch body, and the switch The device is moved to a position where each drive unit of the mechanical device is made unactivatable to make each drive unit unactivatable,
b. When the carry key is rotated in a predetermined direction by a predetermined angle while the controller is energized, the arc cam is rotated in the predetermined direction by the predetermined angle and held at the angular position. The cam holds the lock member in the unlocked position of the operation key so that the operation key can be pulled out from the switch body even when the control device is de-energized, and the switch device is Hold each drive unit of the device in a position where it cannot be activated and keep each drive unit inactivated,
And the carry-in key can be pulled out from the switch body by the locking member,
c. After pulling out the carry-in key from the switch body and pulling out the operation key from the switch body, after the inspection and repair etc. for the mechanical device is performed,
d. When the operation key is inserted through the switch body, the carry key is inserted through the switch body, and the carry key is rotated in the direction opposite to the predetermined direction by the predetermined angle, the arc cam is Rotate in the opposite direction by an angle and return to the original angular position,
e. Thereafter, when energization of the control device is stopped, the control device moves the lock member to the lock position of the operation key to fix the operation key to the switch body, and the switch device is moved to the machine. Each drive part of the device is moved to a starting position to start each drive part, and the arc cam is fixed at the original angular position, and the carry-in key cannot be rotated by fixing the arc cam,
In addition, the carry-in key cannot be pulled out from the switch body by the locking member.
Safety switch characterized by that.