JP3645427B2

JP3645427B2 - Insulation for electric shock prevention

Info

Publication number: JP3645427B2
Application number: JP23876998A
Authority: JP
Inventors: 忠志菅田
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1998-08-25
Filing date: 1998-08-25
Publication date: 2005-05-11
Anticipated expiration: 2018-08-25
Also published as: JP2000069615A

Description

【０００１】
【発明の属する技術分野】
本発明は、特に配電盤や制御盤等に取り付けられた電気制御器具や電気装置等の有する電線接続端子などの端子等が導電部となって生じる感電事故を防止する為の感電防止用絶縁具に関する。
【０００２】
【従来の技術】
配電盤や制御盤等の内部に存在する電線接続端子は導電部分であるために、作業中に人間が触れた場合には感電事故が生じてしまう。従って、配電盤や制御盤には扉やパネルを備えておき、通常はこの扉やパネルを閉じることにより導電部分を露出せず、感電事故を防止することが一般的である。しかし、作業開始時や終了時、又保守点検時等には、扉やパネルを開いて作業を行わなければならず、この時の感電事故の防止が問題であった。そこで、通常は図７に示すような感電防止策を講じている。
【０００３】
この感電防止策について簡単に説明すると、配電盤扉１と、電気制御機器２と、電線接続端子ネジ３と、電線４と、を備える配電盤において、感電防止策として、感電防止板１５及び感電防止板固定金具１６を備えている。この感電防止板１５は、感電防止用絶縁具であり、電線接続端子ネジ３を覆うことによって作業者の感電を防止するものであり、感電防止板固定金具１６にネジ止めされることにより、配電盤扉１上に固定するものである。
【０００４】
このようにして講じられた感電防止策であれば、配電盤扉１を開いて作業や点検を行う場合にも、導電部分である電線接続端子ネジ３は露出されていないので、この部分に作業者が触れて感電事故が生じることを防止できる。
【０００５】
【発明が解決しようとする課題】
しかし、かかる感電防止策では、感電防止板１５は配電盤の大きさや器具の配置に対応して設計・製作をしなければならず、また、電気制御器具２や、電気制御器具２と電線４との接続に異常が生じた場合などには、感電防止板固定金具１６にネジ止めしている感電防止板１５を除去しなければならず、作業の容易さや経費的な面において問題であった。
【０００６】
そこで、このような感電防止板１５を用いる代わりに、個々の導電部分に感電防止用保護キャップを被せる方法を用いることもよく行われている。この感電防止用保護キャップを被せる方法について図８を参照しつつ簡単に説明すると、この感電防止用保護キャップ１７は図８（ｂ）に示す形状をしており、これを図８（ａ）に示すように導電部分、ここでは電線接続端子ネジ３を覆うように被せて用いる。
【０００７】
この感電防止用保護キャップ１７を用いる場合であれば、感電防止板１５を用いる場合に比べて、配電盤や器具の配置、大きさに関係なく利用が可能なので、作業性の面においても、経費の面においても好ましいものとすることが出来る。
【０００８】
しかし、図８（ｃ）に示すように、電線接続端子ネジ３同士の間に設けられた絶縁バリアの間隔が、感電防止用保護キャップ１７の径より小さい場合、この感電防止用保護キャップ１７を利用できないので、やはり汎用性の点において問題は解決していない。
【０００９】
また、実開平５−２３７３号公報では、図９に示すような、電線接続端子に用いる端子ネジ２３の頭部に絶縁カバー２２を設けたねじ締め端子台が開示されている。この端子ネジ２３の頭部に設ける絶縁カバー２２であれば、先述の感電防止用保護キャップ１７を用いる時に生じる問題、即ち絶縁バリア２１の間隔が狭ければ感電防止用保護キャップ１７が利用できない、という問題は解消できるが、この絶縁カバー２２を用いるのであれば、個々の端子ネジ２３、２３…の１つ１つに絶縁カバー２２を装着せねばならず、また絶縁カバー２２が端子ネジ２３から脱落することも考えられるので、作業性の点において問題を有したままであった。
【００１０】
本発明はかかる事情に鑑みてなされたものであり、その目的は導電部分に対して容易に装着可能であり、また作業性、経済性の面においても良好なものとした、感電防止用絶縁具を提供することである。
【００１１】
【課題を解決するための手段】
上記課題を達成するため、本発明の請求項１に記載の感電防止絶縁具では、電気器具が有する端子部分における感電を防止する感電防止用絶縁具において、屈曲・伸展が可能であり、前記端子部分に装着する孔部を有する導電性基材部と、前記導電性基材部の一部を被覆し、かつ前記導電性基材部の屈曲・伸展に伴った屈曲・伸展が可能である絶縁性の感電防止用被覆部と、を備え、前記端子部分に装着した状態において、屈曲させて前記端子部分を覆い得るようにしたことを可能としたことを特徴とする。
【００１２】
また、請求項２に記載の感電防止絶縁具では、請求項１に記載の感電防止用絶縁具において、前記導電性基材部の孔部は、端部開放切り込み部であることを特徴とする。
【００１３】
さらに、請求項３に記載の感電防止絶縁具では、請求項１又は請求項２に記載の感電防止用絶縁具において、前記感電防止用被覆部及び前記導電性基材部を貫通した貫通孔を設けたことを特徴とする。
【００１４】
そして、請求項４に記載の感電防止絶縁具では、請求項１ないし請求項３の何れか１項に記載の感電防止用絶縁具において、前記感電防止用被覆部が、複数の端子部分を覆う大きさを有するものであることを特徴とする。
【００１５】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら説明する。尚、ここで示す実施の形態はあくまでも一例であって、必ずしもこの実施の形態に限定されるものではない。
【００１６】
実施の形態１．
まず、本発明に係る感電防止用絶縁具の一例を、第１の実施の形態として、図を参照しつつ説明する。
図３（ａ）は本実施の形態に係る感電防止用絶縁具８を示す平面図であり、図３（ｂ）はその右側面図である。この感電防止用絶縁具８は、孔部である丸孔８ｂを有する基板８ａと、感電防止用被覆部８ｃと、よりなる平板状のものである。
【００１７】
導電性基材部として機能する基板８ａは、例えば金属板などのように、電気伝導性が高く、容易に屈曲・伸展することが出来る材料よりなることが望ましく、温度変化などに対して形状安定性があり、屈曲・伸展を繰り返す場合にも疲労破損が起こりにくい材料、例えば黄銅等、であることが、大変好ましい。
【００１８】
感電防止用被覆部８ｃは、例えばゴムやビニール樹脂のような高分子材料等のように、絶縁性を有しており、かつ基板８ａとともに屈曲・伸展可能な材料よりなることが望ましい。
【００１９】
そして図２に示すように、基板８ａは感電防止用被覆部８ｃで被覆された部分と被覆されない部分とを有しており、被覆されていない部分が後述するように、電線接続端子ネジ３への装着部となり、この装着部に孔部である丸孔８ｂを設けている。また被覆された部分は、後述のように、使用状態において電線接続端子ネジ３を十分に覆うだけの大きさを有している。
【００２０】
次に、この感電防止用絶縁具８の使用方法について、図面を参照しつつ簡単に説明する。
図１は本実施の形態にかかる感電防止用絶縁具８の使用状態を示す側面図である。図中１は配電盤扉、２は電気制御器具、３は電線接続端子ネジ、４は絶縁被覆電線である。配電盤扉１は、通常は閉じられており、電気制御器具２は、配電盤扉１の裏面に取り付けられた制御器具である。また電線接続端子ネジ３は、電気制御器具２と電線４とを接続するものである。そして図１に示すように、本実施の形態による感電防止用絶縁具８は、使用状態では、導電部分である電線接続端子ネジ３を覆う状態となっている。即ち、感電防止用絶縁具８は、電線接続端子ネジ３に装着した状態において、屈曲させて電線接続端子ネジ３を覆うことが出来るものである。
【００２１】
この感電防止用絶縁具８を電線接続端子ネジ３へ装着する方法を、図２を参照しつつ説明すると、まず図２（ａ）に示すように、感電防止用絶縁具８の丸孔８ｂに電線接続端子ネジ３を挿入し、感電防止用絶縁具８の基板８ａと電気制御器具２の間に電線４を挟み込む。そして図２（ｂ）に示すように、電線接続端子ネジ３を電気制御器具２のネジ孔に差し込んでこれをネジ止めする。この状態で図２（ｃ）に示すように、感電防止用絶縁具８の感電防止用被覆部８ｃを、電線接続端子ネジ３を覆うように、側面視略コの字型に折り曲げる。
【００２２】
このように導電部分に対して感電防止用絶縁具８を装着することで、配電盤扉１を開いた状態においても、作業者が導電部分に触れることを防止出来るのでよい。また、この感電防止用絶縁具８であれば、電線接続端子ネジ３同士の間に設けられた絶縁バリアの間隔に関係なく装着可能なので、利便性に富む感電防止用絶縁具とすることが出来る。
【００２３】
さらにこの感電防止用絶縁具８であれば、これを装着した導電部分に対して、例えば電圧や抵抗の測定等の作業を行いたい場合は、感電防止用絶縁具８を伸展させて折り曲げ状態を解消した後に作業を行い、作業終了後はこれを再び折り曲げればよいので、作業性にも富む感電防止用絶縁具とすることが出来る。
【００２４】
尚、この感電防止用絶縁具８では、装着部として丸孔８ｂを設けたが、この孔の形状は必ずしも丸でなくともよく、電線接続端子ネジと共締め可能であれば、多角形などの形状とすることも可能である。
【００２５】
実施の形態２．
以上説明した第１の実施の形態による感電防止用絶縁具８を、すでに締められている電線接続端子ネジ３に装着するには、一度電線接続端子ネジ３を完全に外さなければ装着できないので、この点装着作業が煩わしくなる場合が考えられる。
【００２６】
そこで、この問題を解消した感電防止用絶縁具９を、第２の実施の形態として、図を参照しつつ説明する。
この感電防止用絶縁具９は図４の平面図に示す通りの形状であり、導電性基材部として機能する基板９ａ、感電防止用被覆部として機能する感電防止用被覆部９ｃと、よりなり、基板９ａは感電防止用被覆部９ｃで被覆された部分と被覆されていない部分とを有している。そして、基板９ａの被覆されていない部分、即ち電線接続端子ネジ３に装着される装着部の孔部として、平面視略Ｕ字型となる端部開放切り込み部９ｂが設けてある。
【００２７】
この感電防止用絶縁具９についてさらに説明すると、まず、基板９ａ、感電防止用被覆部９ｃの材質、形状及び使用方法は、第１の実施の形態において説明した感電防止用絶縁具８、及び感電防止用絶縁具８の基板８ａ，及び感電防止用被覆部８ｃと同様である。
【００２８】
また、感電防止用絶縁具９の電線接続端子ネジ３への装着方法は、基本的には先述の感電防止用絶縁具８と同様であるが、この感電防止用絶縁具９の装着部には、先述の通り平面視略Ｕ字型となる端部開放切り込み部９ｂが設けてあるので、先述の感電防止用絶縁具８の場合とは違い、電線接続端子ネジ３を完全に取り外すことなく、これをゆるめたままの状態で、感電防止用絶縁具９を差し込むことで装着でき、装着作業が容易となるので好ましい。
また、ネジを完全に取り外す必要がないので、ネジの紛失を防止できて好適である。
【００２９】
尚、この切り込み部９ｂの形状については、必ずしも平面視略Ｕ字型となるものでなくともよく、電線接続端子ネジ３と共締め可能であれば、例えば長方形の端部開放切り込み部としてあってもよい。
【００３０】
実施の形態３．
以上説明した感電防止用絶縁具８、９であれば、絶縁性被覆部８ｃ、９ｃを折り曲げて電線接続端子ネジ３を覆うので、簡潔にかつ容易に作業者の感電を防止できる。しかし、この感電防止用絶縁具８、９を装着した電線接続端子ネジ３に対して、例えば電圧の測定をテスターにより行おうとする場合、測定対象の電線接続端子ネジ３を覆う感電防止用絶縁具８、９の絶縁性被覆部８ｃ、９ｃをいちいち伸展させなければならず、その作業が煩わしくなる場合が考えられる。
【００３１】
そこで、一度装着した感電防止用絶縁具を伸展させることなく、上述のような測定作業を可能とした感電防止用絶縁具１０を第３の実施の形態として、図を参照しつつ説明する。
【００３２】
この感電防止用絶縁具１０は図５（ａ）の平面図に示す通りの形状であり、導電性基材部として機能する基板１０ａと、感電防止用被覆部１０ｃと、よりなり、基板１０ａは感電防止用被覆部１０ｃで被覆された部分と、被覆されていない部分と、を有している。そして基板１０ａの被覆されていない部分、即ち装着部には、平面視略Ｕ字型となる端部開放切り込み部１０ｂが設けてあり、感電防止用被覆部１０ｃには、図５（ｂ）に示すように、測定器具挿入用の貫通孔１０ｄが設けてある。
【００３３】
この感電防止用絶縁具１０についてさらに説明すると、まず基板１０ａ、感電防止用被覆部１０ｃの材質、形状及び使用方法は、第１の実施の形態において説明した感電防止用絶縁具８、及び感電防止用絶縁具８の基板８ａ、及び感電防止用被覆部８ｃと同様である。
【００３４】
そして、感電防止用絶縁具１０の電線接続端子ネジ３への装着方法は、先述した、第２の実施の形態における感電防止用絶縁具９の場合と同様である。即ち、電線接続端子ネジ３をゆるめて、そこに切り込み部１０ｂを挿入することで、感電防止用絶縁具１０を装着する。尚、この切り込み部１０ｂの形状は平面視略Ｕ字型となるものである必要はなく、他の形状であってもよい。また、端部開放切り込み部１０ｂの代わりに、第１の実施の形態で示した感電防止用絶縁具８に備えた丸孔８ｂのような貫通孔を設けてもよい。
【００３５】
この感電防止用絶縁具１０を電線接続端子ネジ３に装着し、感電防止用被覆部１０ｃを折り曲げると、図５（ｃ）に示す状態となる。この状態で、例えば電線接続端子ネジ３部分の電圧などをテスターＴにて測定する場合は、テスターＴの先端を、貫通孔１０ｄを通して電線接続端子ネジ３に接すればよい。つまり、一度電線接続端子ネジ３に装着した感電防止用絶縁具１０の感電防止用被覆部１０ｃをわざわざ伸展する必要がないので、測定作業を行いやすくなり、また感電防止用被覆部１０ｃは折り曲げられたままなので、作業者が電線接続端子ネジ３に触れて感電してしまう、という事態を防止できるので、大変好適である。
【００３６】
さらにまた感電防止用被覆部１０ｃの折り曲げや伸展を行うことが少なくなるので、例えば金属疲労などにより感電防止用絶縁具１０がすぐに折れてしまう、ということもなくなるのでよい。
【００３７】
実施の形態４．
以上説明した感電防止用絶縁具は、電線接続端子ネジ３と１対１の関係にある。即ち、第１〜第３の実施の形態で示した感電防止用絶縁具８、９、１０であれば、これを１つの電線接続端子ネジ３に装着しても、感電防止用被覆部８ｃ、９ｃ、１０ｃが覆うことが出来るのは１つの電線接続端子ネジ３だけである。
【００３８】
しかし、実際には、複数の電線接続端子ネジ３、３…が隣接して設けられている配電盤もあり、このような隣接した複数の電線接続端子ネジ３、３…に対して感電防止用絶縁具８、９、１０を用いると、電線接続端子ネジ３の数だけ感電防止用絶縁具８、９、１０が必要となり、経済的に好ましくない。また、電線接続端子ネジ３、３…同士の間隔がほとんど無く、ほぼ接しているような場合、いずれか１つの電線接続端子ネジ３に前述の感電防止用絶縁具８、９、１０を装着すると、隣接する電線接続端子ネジ３にこれらの感電防止用絶縁具８、９、１０を装着できない場合も考えられる。
【００３９】
そこで、複数の電線接続端子ネジ３、３…を一度に覆うことの出来る感電防止用被覆部を備えた感電防止用絶縁具１１を、第４の実施の形態として、図を参照しつつ説明する。
【００４０】
この感電防止用絶縁具１１は図６の平面図に示す通りの形状であり、導電性基材部として機能する基板１１ａと、感電防止用被覆部１１ｃと、よりなり、基板１１ａは感電防止用被覆部１１ｃで被覆された部分と、被覆されていない部分と、を有している。そして基板１１ａの被覆されていない部分、即ち装着部には、平面視略Ｕ字型となる端部開放切り込み部１１ｂが設けてある。
【００４１】
この感電防止用絶縁具１０についてさらに説明すると、まず基板１１ａ、感電防止用被覆部１１ｃの材質、形状及び使用方法は、第１の実施の形態において説明した感電防止用絶縁具８、及び感電防止用絶縁具８の基板８ａ、及び感電防止用被覆部８ｃと同様である。
【００４２】
そして、感電防止用絶縁具１１の電線接続端子ネジ３への装着方法は、先述した第２の実施の形態における感電防止用絶縁具９の場合と同様である。即ち、電線接続端子ネジ３をゆるめて、そこに端部開放切り込み部１１ｂを挿入することで、感電防止用絶縁具１１を装着する。そして感電防止用被覆部１１ｃを折り曲げて、電線接続端子ネジ３をカバーする。尚、この端部開放切り込み部１１ｂの形状は平面視略Ｕ字型となるものである必要はなく、他の形状であってもよい。また、端部開放切り込み部１１ｂを設ける代わりに、第１の実施の形態で示した感電防止用絶縁具８に備えた丸孔８ｂのような貫通孔を設けていてもよい。
【００４３】
このように構成された感電防止用絶縁具１１であれば、１つの電線接続端子ネジ３に１つの感電防止用絶縁具１１を装着することで、感電防止用被覆部１１ｃが複数の電線接続端子ネジ３を一度に覆うことが出来るので、少数の感電防止用絶縁具１１で多数の電線接続端子ネジ３を覆うことになり、装着の効率を向上し、また用意すべき感電防止用絶縁具１１の点数も少なくて済むので、経済的にも好ましいものとなる。
【００４４】
尚、ここで詳述はしないが、この感電防止用被覆部１１ｃに、第３の実施の形態で示した貫通孔を設け、電線接続ネジの点検を容易にすることも考えられる。
【００４５】
以上、第１の実施の形態から第４の実施の形態に示した感電防止用絶縁具であれば、いずれも配電盤扉の裏面に取り付けられた電気器具の端子部の感電防止に寄与するだけでなく、その他、配電盤内部や壁面等に存在する導電部分たる端子部を対象にしても使用可能である。
【００４６】
【発明の効果】
請求項１に記載の感電防止用絶縁具によれば、電気器具が有する端子部分における感電を防止する感電防止用絶縁具において、屈曲・伸展が可能であり、前記端子部分に装着する孔部を有する導電性基材部と、前記導電性基材部の一部を被覆し、かつ前記導電性基材部の屈曲・伸展に伴った屈曲・伸展が可能である絶縁性の感電防止用被覆部と、を備え、前記端子部分に装着した状態において、該感電防止用絶縁具を屈曲させて前記端子部分を覆い得るようにしたので、感電防止用絶縁具を端子部分に簡単に装着でき、また端子部分を覆うことが出来る。また、導電部分近傍の絶縁バリアの有無、絶縁バリアの間隔などに関係なく使用できる。
【００４７】
請求項２に記載の感電防止用絶縁具によれば、孔部を端部開放切り込みとしたので、端子部分に対する装着性がより向上する。
【００４８】
請求項３に記載の感電防止用絶縁具によれば、貫通孔を設けたので、一度端子部分に装着した感電防止用絶縁具を伸展することなく、端子部分の検査や測定が可能となる。
【００４９】
請求項４に記載の感電防止用絶縁具によれば、感電防止用被覆部が、複数の端子部分を覆える大きさを有するので、少数の感電防止用絶縁具によって多数の端子部分の感電を防止できる。
【図面の簡単な説明】
【図１】本発明に係る感電防止用絶縁具を電気機器の端子部分に装着した状態を示す側面図である。
【図２】第１の実施の形態に係る感電防止用絶縁具を電気機器の電線接続端子ネジに装着する手順を示すもので、
（ａ）その分解斜視図である。
（ｂ）電線接続端子ネジをしめつけた状態を示した斜視図である。
（ｃ）電線接続端子ネジに装着した感電防止用絶縁具の絶縁被覆部を折り曲げた状態を示した斜視図である。
【図３】（ａ）第１の実施の形態に係る感電防止用絶縁具の平面図である。
（ｂ）同じく右側面図である。
【図４】第２の実施の形態に係る感電防止用絶縁具の平面図である。
【図５】（ａ）第３の実施の形態に係る感電防止用絶縁具の平面図である。
（ｂ）図５（ａ）中のＡ−Ａ線による断面図である。
（ｃ）第３の実施の形態に係る感電防止用絶縁具を装着した電線接続端子ネジの測定方法の一例を示した斜視図である。
【図６】第４の実施の形態に係る感電防止用絶縁具の平面図である。
【図７】従来の感電防止板を用いた状態を示す斜視図である。
【図８】（ａ）従来用いられていた感電防止用保護キャップを電線接続端子ネジに用いた状態を示した側面図である。
（ｂ）同じく感電防止用保護キャップの斜視図である。
（ｃ）従来用いられていた感電防止用保護キャップを電線接続端子ネジに用いた状態を示した平面図である。
【図９】従来電線接続ネジに用いられていた絶縁カバーを示す概略断面図である。
【符号の説明】
１配電盤扉、２電気制御機器、３電線接続端子ネジ、４電線、８感電防止用絶縁具、８ａ基板、８ｂ丸孔、８ｃ感電防止用被覆部、９感電防止用絶縁具、９ａ基板、９ｂ切り込み部、９ｃ感電防止用被覆部、
１０感電防止用絶縁具、１０ａ基板、１０ｂ切り込み部、１０ｃ感電防止用被覆部、１０ｄ貫通孔、１１感電防止用絶縁具、１１ａ基板、
１１ｂ切り込み部、１１ｃ感電防止用被覆部、１５感電防止板、１６感電防止板固定用金具、１７感電防止用保護キャップ、２０絶縁バリア、
２１絶縁バリア、２２絶縁カバー、２３端子ネジ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric shock prevention insulator for preventing an electric shock accident in which a terminal such as an electric control device attached to a switchboard, a control panel or the like, such as a wire connection terminal of an electric device, etc. becomes a conductive part. .
[0002]
[Prior art]
Since the electric wire connection terminal existing inside the switchboard or the control panel is a conductive part, an electric shock accident occurs when a human touches it during work. Therefore, it is common to provide a switchboard or a control panel with a door or a panel, and normally the conductive part is not exposed by closing the door or the panel, thereby preventing an electric shock accident. However, at the start and end of work, and at the time of maintenance and inspection, the work must be performed with the doors and panels open, and prevention of electric shock at this time has been a problem. Therefore, usually, an electric shock prevention measure as shown in FIG. 7 is taken.
[0003]
This electric shock prevention measure will be briefly described. In the switchboard including the switchboard door 1, the electric control device 2, the wire connection terminal screw 3, and the electric wire 4, as an electric shock prevention measure, an electric shock prevention plate 15 and an electric shock prevention plate are provided. A fixture 16 is provided. This electric shock prevention plate 15 is an electric shock prevention insulator, and prevents electric shock of an operator by covering the wire connection terminal screw 3, and is screwed to the electric shock prevention plate fixing bracket 16, so that the switchboard It is fixed on the door 1.
[0004]
In the case of the electric shock prevention measures taken in this way, even when the switchboard door 1 is opened and the work or inspection is performed, the wire connection terminal screw 3 which is a conductive portion is not exposed. Can prevent electric shock accidents from touching.
[0005]
[Problems to be solved by the invention]
However, in such an electric shock prevention measure, the electric shock prevention plate 15 must be designed and manufactured according to the size of the switchboard and the arrangement of the appliances, and the electric control appliance 2, the electric control appliance 2 and the electric wires 4 When an abnormality occurs in the connection, the electric shock prevention plate 15 screwed to the electric shock prevention plate fixing bracket 16 must be removed, which is a problem in terms of ease of work and cost.
[0006]
Therefore, instead of using such an electric shock prevention plate 15, a method of covering each conductive portion with a protective cap for electric shock is often used. The method of covering the protective cap for preventing electric shock will be briefly described with reference to FIG. 8. The protective cap 17 for preventing electric shock has a shape shown in FIG. 8B, which is shown in FIG. As shown, the conductive portion, here, the wire connection terminal screw 3 is covered and used.
[0007]
If this protective cap 17 for preventing electric shock is used, it can be used regardless of the arrangement and size of the switchboard and appliances compared to the case of using the electric shock preventing plate 15, so that in terms of workability, the cost can be reduced. It can also be preferred in terms of surface.
[0008]
However, as shown in FIG. 8C, when the distance between the insulating barriers provided between the wire connection terminal screws 3 is smaller than the diameter of the electric shock prevention protective cap 17, the electric shock prevention protective cap 17 is Since it cannot be used, the problem is still not solved in terms of versatility.
[0009]
Japanese Utility Model Laid-Open No. 5-2373 discloses a screw terminal block in which an insulating cover 22 is provided on the head of a terminal screw 23 used for a wire connecting terminal as shown in FIG. If the insulating cover 22 is provided on the head of the terminal screw 23, a problem that occurs when the above-described protective cap 17 for preventing electric shock is used, that is, the protective cap 17 for preventing electric shock cannot be used if the distance between the insulating barriers 21 is narrow. However, if this insulating cover 22 is used, the insulating cover 22 must be attached to each of the individual terminal screws 23, 23... Since it could be dropped, it still had a problem in terms of workability.
[0010]
The present invention has been made in view of such circumstances, and an object thereof is to provide an electric shock prevention insulator that can be easily attached to a conductive portion and that is excellent in terms of workability and economy. Is to provide.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the electric shock prevention insulator according to claim 1 of the present invention, in the electric shock prevention insulator for preventing electric shock in the terminal portion of the electric appliance, the terminal can be bent and extended. Conductive base material having a hole to be attached to the part, and insulation that covers a part of the conductive base material and can be bent and extended along with the bending and extension of the conductive base material And an electric shock-preventing covering portion, which can be bent to cover the terminal portion in a state of being attached to the terminal portion.
[0012]
In addition, in the electric shock prevention insulator according to claim 2, in the electric shock prevention insulator according to claim 1, the hole portion of the conductive base material portion is an open end cut portion. .
[0013]
Furthermore, in the electric shock prevention insulator according to claim 3, in the electric shock prevention insulator according to claim 1 or 2, the through hole penetrating the electric shock prevention covering portion and the conductive base material portion is provided. It is provided.
[0014]
And in the electric shock prevention insulator according to claim 4, in the electric shock prevention insulator according to any one of claims 1 to 3, the electric shock prevention covering portion covers a plurality of terminal portions. It is characterized by having a size.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiment shown here is merely an example, and is not necessarily limited to this embodiment.
[0016]
Embodiment 1 FIG.
First, an example of an electric shock prevention insulator according to the present invention will be described as a first embodiment with reference to the drawings.
FIG. 3A is a plan view showing the electrical shock prevention insulator 8 according to the present embodiment, and FIG. 3B is a right side view thereof. This electric shock prevention insulator 8 is a flat plate made of a substrate 8a having a round hole 8b which is a hole, and an electric shock prevention covering portion 8c.
[0017]
The substrate 8a functioning as a conductive base material is preferably made of a material having high electrical conductivity, such as a metal plate, which can be easily bent and extended, and is stable in shape against temperature changes. It is very preferable to use a material that is resistant to fatigue damage even when it is repeatedly bent and extended, such as brass.
[0018]
The electric shock prevention covering portion 8c is preferably made of a material that has an insulating property and can be bent and extended together with the substrate 8a, such as a polymer material such as rubber or vinyl resin.
[0019]
As shown in FIG. 2, the substrate 8a has a portion covered with the electric shock prevention covering portion 8c and a portion not covered, and the uncovered portion is connected to the wire connection terminal screw 3 as will be described later. The mounting part is provided with a round hole 8b which is a hole. Further, as described later, the covered portion has a size enough to sufficiently cover the wire connection terminal screw 3 in use.
[0020]
Next, how to use the electric shock prevention insulator 8 will be briefly described with reference to the drawings.
FIG. 1 is a side view showing a usage state of the electric shock prevention insulator 8 according to the present embodiment. In the figure, 1 is a switchboard door, 2 is an electrical control device, 3 is a wire connection terminal screw, and 4 is an insulation coated wire. The switchboard door 1 is normally closed, and the electric control device 2 is a control device attached to the back surface of the switchboard door 1. The electric wire connecting terminal screw 3 connects the electric control instrument 2 and the electric wire 4. As shown in FIG. 1, the electric shock prevention insulator 8 according to the present embodiment is in a state of covering the wire connection terminal screw 3 that is a conductive portion in the use state. That is, the electric shock prevention insulator 8 can be bent to cover the wire connection terminal screw 3 in a state where it is attached to the wire connection terminal screw 3.
[0021]
A method for mounting the electric shock prevention insulator 8 to the electric wire connecting terminal screw 3 will be described with reference to FIG. 2. First, as shown in FIG. 2A, the round hole 8 b of the electric shock prevention insulator 8 is formed. The electric wire connecting terminal screw 3 is inserted, and the electric wire 4 is sandwiched between the substrate 8a of the electric shock prevention insulator 8 and the electric control instrument 2. And as shown in FIG.2 (b), the electric wire connection terminal screw 3 is inserted in the screw hole of the electric control instrument 2, and this is screwed. In this state, as shown in FIG. 2 (c), the electric shock prevention covering portion 8 c of the electric shock prevention insulator 8 is bent into a substantially U shape in side view so as to cover the wire connection terminal screw 3.
[0022]
By mounting the electric shock prevention insulator 8 on the conductive portion in this way, it is possible to prevent the operator from touching the conductive portion even when the switchboard door 1 is opened. In addition, the electric shock prevention insulator 8 can be mounted regardless of the interval between the insulating barriers provided between the wire connection terminal screws 3, so that it is possible to provide an electric shock prevention insulator that is highly convenient. .
[0023]
Furthermore, in the case of this electric shock prevention insulator 8, when it is desired to perform, for example, voltage or resistance measurement on the conductive portion to which the electric shock is attached, the electric shock prevention insulator 8 is extended to be bent. Since the work is performed after the problem is solved and the work is finished again, it can be bent again, so that the electric shock prevention insulator having a high workability can be obtained.
[0024]
In addition, in this electric shock prevention insulator 8, the round hole 8b is provided as a mounting portion. However, the shape of this hole does not necessarily have to be a circle, and if it can be fastened together with the wire connection terminal screw, a polygonal shape or the like can be used. It is also possible to have a shape.
[0025]
Embodiment 2. FIG.
In order to attach the electric shock prevention insulator 8 according to the first embodiment described above to the already tightened wire connection terminal screw 3, it cannot be attached unless the wire connection terminal screw 3 is once completely removed. The case where this point mounting work becomes troublesome can be considered.
[0026]
Therefore, an electric shock preventing insulator 9 that solves this problem will be described as a second embodiment with reference to the drawings.
This electric shock prevention insulator 9 has a shape as shown in the plan view of FIG. 4, and includes a substrate 9a that functions as a conductive base material portion, and an electric shock prevention coating portion 9c that functions as an electric shock prevention coating portion. The substrate 9a has a portion covered with an electric shock prevention covering portion 9c and a portion not covered. And as the hole part of the attachment part with which the board | substrate 9a is not coat | covered, ie, the wire connection terminal screw 3, the edge part open cut | notch part 9b used as planar view substantially U shape is provided.
[0027]
The electric shock prevention insulator 9 will be further described. First, the material, shape, and usage of the substrate 9a and the electric shock prevention covering portion 9c are the electric shock prevention insulator 8 and electric shock described in the first embodiment. This is the same as the substrate 8a and the electric shock prevention covering portion 8c of the prevention insulator 8.
[0028]
The mounting method of the electric shock prevention insulator 9 to the wire connection terminal screw 3 is basically the same as that of the electric shock prevention insulator 8 described above. As described above, since the open end cut portion 9b that is substantially U-shaped in plan view is provided, unlike the above-described case 8 for preventing electric shock, without completely removing the wire connection terminal screw 3, In a state where this is loosened, it can be mounted by inserting the electric shock prevention insulator 9, which is preferable because the mounting operation becomes easy.
Further, since it is not necessary to completely remove the screw, the loss of the screw can be prevented, which is preferable.
[0029]
In addition, about the shape of this cut | notch part 9b, it does not necessarily need to become a planar view substantially U-shape, and if it can be fastened together with the electric wire connection terminal screw 3, it has as a rectangular edge part open cut | notch part, for example Also good.
[0030]
Embodiment 3 FIG.
With the electric shock prevention insulators 8 and 9 described above, the insulating covering portions 8c and 9c are bent to cover the wire connection terminal screw 3, so that the operator's electric shock can be prevented simply and easily. However, for example, when the voltage is measured with a tester on the electric wire connection terminal screw 3 on which the electric shock prevention insulators 8 and 9 are mounted, the electric shock prevention insulator covering the electric wire connection terminal screw 3 to be measured. It is conceivable that the 8 and 9 insulating covering portions 8c and 9c must be extended one by one, which makes the operation troublesome.
[0031]
Accordingly, an electric shock prevention insulator 10 that enables the above-described measurement work without extending the electric shock prevention insulator once mounted will be described as a third embodiment with reference to the drawings.
[0032]
The electric shock prevention insulator 10 has a shape as shown in the plan view of FIG. 5A, and includes a substrate 10a functioning as a conductive base material portion and an electric shock prevention coating portion 10c. It has a portion covered with the electric shock prevention covering portion 10c and a portion not covered. The uncovered portion of the substrate 10a, that is, the mounting portion, is provided with an end opening cut portion 10b that is substantially U-shaped in plan view. The electric shock prevention covering portion 10c is shown in FIG. As shown, a through hole 10d for insertion of a measuring instrument is provided.
[0033]
The electric shock prevention insulator 10 will be further described. First, the material, shape and usage of the substrate 10a and the electric shock prevention covering portion 10c are the electric shock prevention insulator 8 and electric shock prevention described in the first embodiment. This is the same as the substrate 8a of the electrical insulator 8 and the covering portion 8c for preventing electric shock.
[0034]
And the mounting method of the electric shock prevention insulator 10 to the electric wire connection terminal screw 3 is the same as that of the electric shock prevention insulator 9 in the second embodiment described above. That is, by loosening the wire connection terminal screw 3 and inserting the cut portion 10b therein, the electric shock prevention insulator 10 is mounted. Note that the shape of the notch 10b does not have to be substantially U-shaped in plan view, and may be another shape. Further, instead of the end opening notch 10b, a through hole such as the round hole 8b provided in the electric shock prevention insulator 8 shown in the first embodiment may be provided.
[0035]
When the electric shock prevention insulator 10 is attached to the wire connection terminal screw 3 and the electric shock prevention covering portion 10c is bent, the state shown in FIG. 5C is obtained. In this state, for example, when measuring the voltage of the electric wire connecting terminal screw 3 with the tester T, the tip of the tester T may be in contact with the electric wire connecting terminal screw 3 through the through hole 10d. That is, there is no need to bother extending the electric shock prevention covering portion 10c of the electric shock prevention insulator 10 once attached to the electric wire connection terminal screw 3, so that the measurement operation is facilitated, and the electric shock prevention covering portion 10c is bent. Therefore, it is possible to prevent a situation in which the operator touches the wire connection terminal screw 3 and gets an electric shock, which is very suitable.
[0036]
Furthermore, since it is less likely to bend or extend the covering portion 10c for preventing electric shock, it is not necessary for the insulating member 10 for preventing electric shock to be broken immediately due to, for example, metal fatigue.
[0037]
Embodiment 4 FIG.
The electric shock prevention insulator described above has a one-to-one relationship with the wire connection terminal screw 3. That is, if the electric shock prevention insulators 8, 9, and 10 shown in the first to third embodiments are attached to one electric wire connecting terminal screw 3, the electric shock prevention covering portion 8c, 9c and 10c can cover only one electric wire connecting terminal screw 3.
[0038]
However, there is actually a switchboard in which a plurality of wire connection terminal screws 3, 3... Are provided adjacent to each other. If the tools 8, 9, and 10 are used, the number of electrical shock prevention insulators 8, 9, and 10 are required as many as the number of wire connection terminal screws 3, which is not economically preferable. Moreover, when there is almost no space | interval between wire connection terminal screws 3, 3 ..., and it is almost touching, when the above-mentioned electric shock prevention insulators 8, 9, 10 are attached to any one of the wire connection terminal screws 3 It is also conceivable that these electric shock prevention insulators 8, 9, 10 cannot be attached to the adjacent wire connection terminal screw 3.
[0039]
Then, the electric shock prevention insulator 11 provided with the electric shock prevention coating | coated part which can cover several electric wire connection terminal screw 3, 3 ... at once is demonstrated, referring a figure as 4th Embodiment. .
[0040]
This electric shock prevention insulator 11 has a shape as shown in the plan view of FIG. 6, and includes a substrate 11a functioning as a conductive base material portion and an electric shock prevention coating portion 11c. The substrate 11a is used for electric shock prevention. It has the part coat | covered with the coating | coated part 11c, and the part which is not coat | covered. The uncovered portion of the substrate 11a, that is, the mounting portion, is provided with an open end cut portion 11b that is substantially U-shaped in plan view.
[0041]
The electric shock prevention insulator 10 will be further described. First, the material, shape and usage of the substrate 11a and the electric shock prevention covering portion 11c are the electric shock prevention insulator 8 and electric shock prevention described in the first embodiment. This is the same as the substrate 8a of the electrical insulator 8 and the covering portion 8c for preventing electric shock.
[0042]
And the mounting method to the electric wire connection terminal screw 3 of the insulator 11 for electric shock prevention is the same as that of the insulator 9 for electric shock prevention in 2nd Embodiment mentioned above. That is, the electric wire connecting terminal screw 3 is loosened, and the end opening notch 11b is inserted therein, so that the electric shock preventing insulator 11 is mounted. Then, the electric shock prevention covering portion 11 c is bent to cover the wire connection terminal screw 3. In addition, the shape of the open end cut portion 11b does not need to be substantially U-shaped in a plan view, and may be another shape. Further, instead of providing the open end cut portion 11b, a through hole such as the round hole 8b provided in the electric shock prevention insulator 8 shown in the first embodiment may be provided.
[0043]
If it is the electric shock prevention insulator 11 comprised in this way, the electric shock prevention coating | coated part 11c will be equipped with several electric wire connection terminals by mounting | wearing the electric wire connection terminal screw 3 with one electric shock prevention insulator 11. FIG. Since the screws 3 can be covered at one time, a small number of electric shock prevention insulators 11 cover a large number of wire connection terminal screws 3 to improve the mounting efficiency and to provide the electric shock prevention insulators 11 to be prepared. Therefore, it is economically preferable.
[0044]
Although not described in detail here, it is conceivable that the through hole shown in the third embodiment is provided in the electric shock prevention covering portion 11c to facilitate the inspection of the electric wire connecting screw.
[0045]
As mentioned above, if it is an electric shock prevention insulator shown in the first embodiment to the fourth embodiment, all contribute to the electric shock prevention of the terminal part of the electric appliance attached to the back surface of the switchboard door. In addition, the present invention can also be used for a terminal portion which is a conductive portion existing inside the switchboard or on the wall surface.
[0046]
【The invention's effect】
According to the electric shock prevention insulator according to claim 1, in the electric shock prevention insulator for preventing electric shock in the terminal portion of the electric appliance, the electric shock prevention insulator can be bent and extended, and the hole portion to be attached to the terminal portion is provided. An electrically conductive base part having an insulating and electroconductive base part covering the part of the conductive base part and capable of bending / extending along with bending / extending of the conductive base part And the electric shock prevention insulator can be bent to cover the terminal portion when attached to the terminal portion, and the electric shock prevention insulator can be easily attached to the terminal portion. The terminal part can be covered. Further, it can be used regardless of the presence or absence of an insulation barrier near the conductive portion, the interval between the insulation barriers, and the like.
[0047]
According to the electric shock prevention insulator according to the second aspect, since the hole portion has the open end cut, the mounting property to the terminal portion is further improved.
[0048]
According to the electric shock preventing insulator according to the third aspect, since the through hole is provided, the terminal portion can be inspected and measured without extending the electric shock preventing insulator once attached to the terminal portion.
[0049]
According to the electric shock prevention insulator according to claim 4, since the electric shock prevention covering portion has a size capable of covering the plurality of terminal portions, electric shocks of a large number of terminal portions are caused by a small number of electric shock prevention insulators. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which an electric shock-preventing insulator according to the present invention is attached to a terminal portion of an electric device.
FIG. 2 shows a procedure for mounting the electric shock prevention insulator according to the first embodiment on a wire connection terminal screw of an electric device;
(A) It is the disassembled perspective view.
(B) It is the perspective view which showed the state which fastened the electric wire connection terminal screw.
(C) It is the perspective view which showed the state which bent the insulating coating | coated part of the electric shock prevention insulator attached to the electric wire connection terminal screw.
FIG. 3A is a plan view of an electric shock prevention insulator according to the first embodiment;
(B) It is a right view similarly.
FIG. 4 is a plan view of an electric shock prevention insulator according to a second embodiment.
FIG. 5A is a plan view of an electric shock prevention insulator according to a third embodiment;
(B) It is sectional drawing by the AA line in Fig.5 (a).
(C) It is the perspective view which showed an example of the measuring method of the electric wire connection terminal screw which mounted | wore with the electric shock prevention insulator which concerns on 3rd Embodiment.
FIG. 6 is a plan view of an electric shock prevention insulator according to a fourth embodiment.
FIG. 7 is a perspective view showing a state in which a conventional electric shock prevention plate is used.
FIG. 8A is a side view showing a state in which a conventionally used protective cap for electric shock is used for a wire connection terminal screw.
(B) It is a perspective view of the protective cap for similarly preventing an electric shock.
(C) It is the top view which showed the state which used the protective cap for electric shock prevention used conventionally for the electric wire connection terminal screw.
FIG. 9 is a schematic cross-sectional view showing an insulating cover used for a conventional wire connecting screw.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Switchboard door, 2 Electric control apparatus, 3 Electric wire connection terminal screw, 4 Electric wire, 8 Electric shock prevention insulator, 8a Substrate, 8b Round hole, 8c Electric shock prevention covering part, 9 Electric shock prevention insulator, 9a Substrate, 9b Incision part, 9c Cover part for electric shock prevention,
DESCRIPTION OF SYMBOLS 10 Electric shock prevention insulator, 10a board | substrate, 10b Cut | notch part, 10c Electric shock prevention coating | coated part, 10d Through-hole, 11 Electric shock prevention insulator, 11a Board | substrate,
11b Notch, 11c Electric shock prevention coating, 15 Electric shock prevention plate, 16 Electric shock prevention plate fixing bracket, 17 Electric shock prevention protective cap, 20 Insulation barrier,
21 Insulation barrier, 22 Insulation cover, 23 Terminal screw.

Claims

In the electric shock prevention insulator for preventing electric shock in the terminal part of the electric appliance,
A conductive base material that can be bent and extended and has a hole to be attached to the terminal part; and
Covering a part of the conductive base material part, and comprising an insulating anti-electric shock covering part capable of bending / extending along with bending / extension of the conductive base material part,
In the state of being attached to the terminal portion, it is possible to bend and cover the terminal portion,
Insulator for preventing electric shock.

The electric shock prevention insulator according to claim 1,
The hole portion of the conductive base material portion is an end opening cut portion,
Insulator for preventing electric shock.

In the electric shock prevention insulator according to claim 1 or 2, characterized in that a through hole penetrating the electric shock prevention covering portion and the conductive base material portion is provided.
Insulator for preventing electric shock.

In the electric shock prevention insulator according to any one of claims 1 to 3,
The electric shock prevention covering portion has a size covering a plurality of terminal portions,
Insulator for preventing electric shock.