JP3563356B2

JP3563356B2 - Box through-hole closing structure, and box through-hole forming method with through-hole closing portion

Info

Publication number: JP3563356B2
Application number: JP2001036768A
Authority: JP
Inventors: 昭八清水; 建世古田
Original assignee: Mirai Industry Co Ltd
Current assignee: Mirai Industry Co Ltd
Priority date: 2000-09-26
Filing date: 2001-02-14
Publication date: 2004-09-08
Anticipated expiration: 2021-02-14
Also published as: JP2002176720A

Description

【０００１】
【発明の属する技術分野】
本発明は、ボックスの透孔形成予定部に閉塞部が除去可能に設けられ、該閉塞部が除去されて配線・配管材を挿通又は接続させる透孔が形成されるボックスの透孔閉塞構造、及び透孔閉塞部を備えたボックスの透孔形成方法に関するものである。
【０００２】
【従来の技術】
従来より、ボックスの配線・配管材を挿通又は接続させるための透孔は、除去可能な閉塞部を一体に成形して閉塞し、透孔使用時に、該閉塞部を除去して開口するようにしている。この閉塞部は、一般にハンマー等で殴打して打ち抜かれるが、この場合に、ハンマーの殴打衝撃によりボックス壁に亀裂が入ったり、割れて破損するといった問題が生じていた。
【０００３】
そこで、本出願人は、電気工事業者や各種設備業者が、常時携帯しているドライバーを用いて、閉塞部をこじ開けて除去できるボックスの透孔閉塞構造を提案している（特開平10-42427号公報) 。即ち、この透孔閉塞構造は、除去開口して、ボックスに透孔を形成する閉塞部に、マイナスドライバーの先端部が挿通可能な係止孔を設けたものである。
【０００４】
しかし、上記透孔閉塞構造にあっては、マイナスドライバーのみ使用可能であるため、プラスドライバーのみを所持している場合には、透孔の開口ができないこと、マイナスドライバーの先端を閉塞部の係止孔に位置合わせするのが面倒で、作業性がよくないこと、閉塞部の連結強度が強いと、こじ開けるのが容易でないこと等の問題があった。
【０００５】
特に、コンクリート埋設用のボックスにあっては、コンクリートの侵入を防止すべく、閉塞部の全周に亘って連結部を形成することが望ましく、かかる場合のこじ開け作業は、大きな「こじ開け力」が要求されるために、極めて困難となる。なお、前記閉塞部の全周に亘る連結は、一般に、従来より薄バリ構造で形成しているが、製造技術上の公差によって薄バリの肉厚にバラツキが生じる結果、薄バリが過度に厚くなったり、形成されなくなったりして、閉塞部の除去が困難となったり、コンクリートが侵入したりする問題もあった。
【０００６】
また、上記した従来の透孔閉塞構造では、閉塞部にマイナスドライバーの先端部を係止させる係止孔が必ず設けられていて、該係止孔からコンクリートが侵入するため、上記した従来構造は、コンクリート埋設には、適していない。
【０００７】
【発明が解決しようとする課題】
本発明の課題は、工事業者が常時携帯しているプラス又はマイナスのいずれのドライバーの使用も可能であって、閉塞部の連結強度が強くても確実にこじ開けることができ、しかも作業性の高いボックスの透孔閉塞構造の提供である。
【０００８】
【課題を解決するための手段】
この課題を解決するための請求項１の発明は、ボックスの透孔形成予定部に閉塞部が除去可能に設けられ、該閉塞部が除去されて配線・配管材を挿通又は接続させる透孔が形成されるボックスの透孔閉塞構造であって、前記ボックスの一部を構成していて、前記透孔が形成される透孔形成壁部と、前記透孔を閉塞すべく、破断可能な第１連結部を介して前記透孔形成壁部と一体に形成される第１閉塞部と、ドライバー等の工具の押圧により前記第１連結部を破断することなく破断される第２連結部を介して前記第１閉塞部及び前記透孔形成壁部と一体に形成され、前記第２連結部の破断により打ち抜かれて前記工具の軸部を貫通可能な貫通部を形成するための第２閉塞部とを備え、前記第１閉塞部は、前記貫通部に貫通した前記工具の軸部を、前記透孔形成壁部に当接させた状態で、当該当接部を支点にして回動させることにより、前記第１連結部を破断して前記透孔を開口させるべく除去される構成であることを、その特徴としている。
【０００９】
このため、請求項１の発明によれば、工具により第２連結部を破断して第２閉塞部を打ち抜いて貫通部を形成した後に、前記貫通部に工具の軸部を挿通して、該軸部をボックスの透孔形成壁部に当接させた状態で、該当接部を中心にして、前記軸部が前記透孔形成壁部に近接する方向に回動させると、第１連結部は、第１閉塞部に作用する「こじ開け力」により破断される。これにより、ボックスの透孔形成予定部に設けられた第１閉塞部が除去されて、透孔が形成される。
【００１０】
【００１１】
【００１２】
【００１３】
また、請求項２の発明は、請求項１の発明を前提として、前記第２閉塞部の外面は、前記第１閉塞部及び透孔形成壁部の外面よりも低く形成してあるために、透孔形成作業において最初に行う第２閉塞部の除去作業の際に、前記第２閉塞部に対する工具の先端部の位置決めが容易となって、作業性が高まる。
【００１４】
また、請求項３の発明は、請求項１又は２の発明を前提として、前記第１及び第２の各連結部は、前記第１及び第２の各閉塞部、並びに透孔形成壁部の間を隙間なく閉塞して設けられたものである。上記したように、請求項１の発明によれば、第１及び第２の各閉塞部の全周が連結されていても、第２閉塞部に対する工具の押圧操作と、第１閉塞部に対する工具のこじ開け操作とによって、ボックスの透孔形成壁部に透孔を確実に開けられて、第１及び第２の各連結部を十分な厚みを有して製作できるために、請求項３の発明によって、コンクリートの侵入を確実に防止できるボックスの提供が可能となる。
【００１５】
また、請求項４の発明は、請求項１ないし３のいずれかの発明を前提として、前記透孔形成壁部は、前面開口と底壁部とを有する有底ボックスの側壁部で構成されて、前記貫通部は、前記ボックスの側壁部の前記底壁部の側に偏在配置されているものであるため、工具を回動させて、第１閉塞部をこじ開ける場合において、回動支点となる前記工具の軸部が耐変形力の大きな前記底壁部に近くなる。よって、第１閉塞部に大きな「こじ開け力」を作用させることができて、透孔の形成作業が容易となる。また、請求項５の発明は、請求項１ないし４のいずれかの発明を前提にして、前記第２閉塞部は、ボックスに対向する作業者を基準にして、左右方向の中心に対して右側に偏在していることを特徴としているので、右利きの多い作業者が作業をし易い姿勢で第２閉塞部を打ち抜くことができる。更に、請求項６の発明は、請求項１ないし５のいずれかの発明を前提として、工具がドライバーであることを特徴としており、工事業者は、ドライバーを常時携帯しており、しかも、その軸部は、貫通部に挿通し易いので、前記透孔形成作業を確実に行える。
【００１６】
また、請求項７の発明は、請求項１ないし６のいずれかの発明を前提として、前記第１閉塞部は、残存させたままで、第２閉塞部のみを打ち抜いて、その貫通孔を電線挿通孔として用いることを特徴としている。このため、壁裏配線においてボックスをコンクリート埋設しなくて、しかも配線する電線の数が少ない場合には、電線管を使用せずに、ボックスに対して電線の接続が可能になると共に、前記貫通孔は電線により閉塞されるので、該貫通孔からボックス内にほこり等の異物が侵入しなくなる。また、請求項８の発明は、請求項１ないし７のいずれかの発明において、前記第２閉塞部の形状は、工具の軸部に対応した略閉塞Ｕ字状であることを特徴としているため、工具の軸部により第２閉塞部を支障なく貫通できると共に、貫通後において工具の軸部を回動させて第１閉塞部を打ち抜く操作も支障なく行える。更に、請求項９の発明は、請求項１に記載の透孔閉塞構造を有するボックスにおいて、第１及び第２の各閉塞部を打ち抜いて、透孔を形成する方法であって、ドライバー等の工具の先端部を第２閉塞部に押圧させて、第１閉塞部を残存させた状態で前記第２閉塞部のみを打ち抜いて貫通部を形成する操作と、前記貫通部に挿通された前記工具の軸部を、透孔形成壁部に当接させた状態で、当該当接部を支点に前記工具を回動させて、第１連結部の破断により第１閉塞部を除去する操作とを、一連の動作で連続させて透孔を形成することを特徴としているために、第１及び第２の各閉塞部を除去してボックスに透孔を形成する作業を確実に行えると共に、その作業の能率が高まる。
【００１７】
【発明の実施の形態】
以下、実施例を挙げて、本発明を更に詳細に説明する。図１は、本発明に係る透孔閉塞構造を有するボックスＢの斜視図であり、図２は、同じく側壁部１に設けられた透孔形成予定部Ｐを示す部分拡大平面図であり、図３は、同じく一部を破断した斜視図であり、図４は、図２のＸ₁−Ｘ₁線断面図であり、図５は、図２のＸ₂−Ｘ₂線断面図である。最初に、図１ないし図５を参照にして、本発明に係るボックスの透孔閉塞構造について説明して、その後に、ボックスＢの透孔形成予定部Ｐに設けられた第１及び第２の各閉塞部１１，１２を除去して、透孔Ｈ₀を形成する方法について説明する。
【００１８】
ボックスＢは、側壁部１と底壁部２とを備えていて、前面が開口した構造であって、４つの各側壁部１には、それぞれ透孔形成予定部Ｐが設けられている。透孔形成予定部Ｐは、ボックスＢに配線・配管材を接続させる場合に、当該部分の第１及び第２の各閉塞部１１，１２を除去して、透孔Ｈ₀が形成される部分であって、透孔Ｈ₀の形成の必要がない場合には、そのままの閉塞状態が維持される。前記透孔Ｈ₀は、第１及び第２の各閉塞部１１，１２によって閉塞されている。第１閉塞部１１は、透孔Ｈ₀の大部分を閉塞しており、第２閉塞部１２は、その残りの部分を部分的に閉塞している。即ち、第１閉塞部１１は、円形の外周の一部を略閉塞Ｕ字状に欠落させた形状であって、薄肉の第１連結部１３を介してボックスＢの前記側壁部１に隙間なく連結されていると共に、同じく薄肉の第２連結部１４を介して第２閉塞部１２に隙間なく連結されている。また、第２閉塞部１２は、その全周が第２連結部１４を介して前記第１閉塞部１１及びボックスＢの側壁部１に連結されている。これにより、第１及び第２の各閉塞部１１，１２は、その全周に亘って相手方と連結されているため、ボックスＢの透孔形成予定部Ｐは、完全閉塞構造になっている。また、第２閉塞部１２の形状を略閉塞Ｕ字状にしたのは、透孔形成作業に使用するドライバーの軸部の断面が円形であることに対応させたものである。
【００１９】
また、第２閉塞部１２は、ボックスＢの底壁部２に対して垂直な方向に沿って当該底壁部２の側に偏在し、しかも作業者がボックスＢの背後に位置した場合において、左右方向の中心に対して右側に偏在している。前者の理由は、ドライバーＤを回動させて第１閉塞部１１をこじ開ける際に、該ドライバーの回動支点を耐変形力が大きな底壁部２の側に位置させて、大きな「こじ開け力」を作用させられるようにしたためであり、後者の理由は、作業者の多くは、右利きであり、これに対応して中心よりも右側に偏在させることにより、作業をし易くするためである。
【００２０】
また、ボックスＢの側壁部１に形成される透孔Ｈ₀の内周面は、前記側壁部１の壁面（外面）に対して垂直に形成されているのに対して、前記第１及び第２の各閉塞部１１，１２の外周面は、当該第１閉塞部１１における第２閉塞部１２との接続部分を除いて、各閉塞部１１，１２の外面に対して鈍角状に形成されている。なお、第１閉塞部１１の外周面における第２閉塞部１２との接続部分は、自身の外面に対して垂直に形成されて、第１閉塞部１１に対して第２閉塞部１２を切離し易くしてある。
【００２１】
また、図３ないし図５に示されるように、第１閉塞部１１の外面は、ボックスＢの側壁部１の外面よりも僅かに低く形成され、第２閉塞部１２の外面は、第１閉塞部１１及びボックスＢの側壁部１の各外面よりも遙に低く形成されている。これにより、ボックスＢの外面においては、第２閉塞部１２の部分において、大きな段差が形成され、この段差は、当該第２閉塞部１２をドライバーＤにより押圧して打ち抜く際に、該ドライバーＤの位置決め機能を果たす。
【００２２】
また、前記した第１及び第２の各連結部１３，１４の肉厚に関しては、第２閉塞部１２の打抜き時において、第１閉塞部１１を、そのままの姿勢で残しておくこと、即ち、第１連結部１３が切離されないようにすることが望ましいので、第１連結部１３の肉厚は、第２連結部１４のそれに比較して僅かに厚くしてある。また、図２及び図３において、第１及び第２の各閉塞部１１，１２と、ボックスＢの側壁部１とは、前記第１及び第２の各連結部１３，１４の肉厚よりも僅かに厚肉であって、しかも狭巾の連結補強部１５，１６で連結されて、両者の連結強度を高めている。なお、図１において、３は、ボックスＢの開口に設けられた一対の器具取付用ボスを示す。
【００２３】
引き続いて、ボックスＢに設けられた複数の透孔形成予定部Ｐのうち必要な部分に透孔Ｈ₀を形成する作業について説明する。先ず、図６に示されるように、プラスドライバーＤの軸部Ｄａの先端部を第２閉塞部１２に対してほぼ垂直に当てがい、この状態で、強く押圧させると、前記第２閉塞部１２を第１閉塞部１１及びボックスＢの側壁部１に連結している第２連結部１４は、その肉厚が、前記第１閉塞部１１を第２閉塞部１２及びボックスＢの側壁部１に連結している第１連結部１３の肉厚よりも薄くなっていて、前記第１連結部１３よりも強度が小さいために、第１閉塞部１１は、そのまま残って、第２閉塞部１２のみが打ち抜かれて、貫通孔Ｈ₁が開けられる。ここで、打抜きの対象である第２閉塞部１２は、第１閉塞部１１よりも低く形成されて、両者の間に段差が設けられているため、ドライバーＤの軸部Ｄａの先端部の位置決めが容易となる。なお、図６に示される例では、貫通孔Ｈ₁の形成後においては、第２閉塞部１２の打抜き片１２’は、その全周において最も連結強度の大きい第１連結部１３の部分において僅かに第１閉塞部１１に連結された状態となっている（図１０参照）が、打抜き片１２’は、切離されて完全に打ち抜かれることもあり、上記とは異なる他の部位において第１閉塞部１１に連結されたままとなることも有り得る。しかし、打抜き片１２は、第１連結部１１に連結された状態となっていて、該第１連結部１１を除去した除去片１１’に連結されていることが、施工現場の清掃等の観点から好ましい。
【００２４】
上記のようにして、第２閉塞部１２を打ち抜いて、貫通孔Ｈ₁を形成すると、図７に示されるように、プラスドライバーＤの軸部Ｄａは、その基端部が前記貫通孔Ｈ₁に達した挿通状態となる。このままの状態で、図８及び図９に示されるように、ドライバーＤの軸部Ｄａを僅かに引き上げて、該軸部ＤａをボックスＢの側壁部１における底壁部２に近い側に当接させた状態で、当該当接部Ｔを中心にして、前記軸部Ｄａの先端部が前記側壁部１に近接する方向に回動させると、ボックスＢの側壁部１に対して第１閉塞部１１を連結している第１連結部１３は、第１閉塞部１１に作用する「こじ開け力」によって破断される。これにより、図１０及び図１２に示されるように、ボックスＢの透孔形成予定部Ｐに設けられた第１閉塞部１１が除去されて、目的の透孔Ｈ₀が形成される。なお、図１０において、１１’は、第１閉塞部１１を切除した切除片を示す。
【００２５】
上記実施例では、前記貫通孔Ｈ₁は、ボックスＢの側壁部１の底壁部２の側に偏在して設けられるために、ドライバーＤを回動させて、第１閉塞部１１をこじ開ける場合の前記ドライバーＤの回動支点は、ボックスＢにおける耐変形力の大きな底壁部２に近い側となる。このため、ボックスＢを破損させたり、亀裂を生じさせることなく、第１閉塞部１１に大きな「こじ開け力」を作用させられて、透孔Ｈ₀の形成作業が容易となる。また、作業者の多くが右利きであることに対応させて、前記貫通孔Ｈ₁は、形成すべき透孔Ｈ₀に対して右側に偏在しており、この貫通孔Ｈ₁の偏在配置によっても、透孔形成作業がし易くなる。
【００２６】
上記のように、工事業者が常時携帯しているプラスドライバーＤを使用して、第２閉塞部１２をドライバーＤで押圧して打ち抜いた後に、そのまま前記ドライバーＤを回動させて第１閉塞部１１を除去でき、一連の動作により迅速に透孔Ｈ₀が開けられる。
【００２７】
このように、本発明の透孔閉塞構造を備えたボックスは、連続した一連の動作により透孔Ｈ₀が開けられるのに加えて、ドライバーＤの軸部Ｄａを側壁部１の貫通孔Ｈ₁に臨む部分に当接させ、該当接部を支点にして前記ドライバーＤを回動させて第１閉塞部１１をこじ開けて除去するので、大きな「こじ開け力」によって第１閉塞部１１の全周を確実に切離して除去できる。従って、本発明によれば、上記実施例における第１及び第２の各連結部１３，１４を十分な肉厚で製作することが可能となって、コンクリートの侵入を確実に防止できるボックスの製作が可能となる。
【００２８】
そして、図１２に示されるように、上記のようにして、ボックスＢの側壁部１に形成された透孔Ｈ₀の部分において、ボックスＢには、コネクタ本体３１とナット部材３２とスリーブ３３とから成るコネクタＣを介して電線管Ａが接続される。
【００２９】
また、上記実施例のボックスＢは、透孔形成予定部Ｐの全面が第１及び第２の各閉塞部１１，１２で閉塞されていて、コンクリート埋設型のものであるが、本発明は、コンクリート埋設以外の用途のボックスも実施の対象としており、このボックスの場合には、貫通孔Ｈ₁は、製作時に予め開けておくこともできる。
【００３０】
また、上記実施例では、第１及び第２の各閉塞部１１，１２に高低差が設けられていて、その段差を利用することにより、押圧して打ち抜かれる第２閉塞部１２に対するドライバーＤの位置決めが容易となる利点があるが、本発明においては、第１及び第２の各閉塞部１１，１２に高低差を設けることは、必須の構成ではない。また、ドライバーによって打ち抜かれる第２閉塞部の形状に関しても、前記実施例のように、該ドライバーの軸部の断面に対応した形状であることが、最も打ち抜き易いのであるが、図１１に示されるように、第２閉塞部２２の形状は、ドライバーの軸部が挿通可能であればよいため、方形状等の他の形状であってもよい。なお、図１１において、２１は、第１閉塞部を示す。
【００３１】
また、上記実施例のボックスＢにおいて、コンクリート埋設しない壁裏配線において、配線する電線が少ない場合には、その第２閉塞部１２（２２）を打ち抜いて形成された貫通孔Ｈ₁自体を電線挿通孔として利用し、残りの第１閉塞部１１（２１）は、そのまま残存させた状態で、前記貫通孔Ｈ₁に電線を挿通配線することも可能である。これにより、電線管を使用せずに、ボックスＢに対して電線の接続が可能となると共に、前記貫通孔Ｈ₁に電線を挿通させることにより、該貫通孔Ｈ₁が閉塞されて、該貫通孔Ｈ₁からボックスＢ内にほこり等の異物の侵入が防止される。また、横断面が楕円状の電線を使用する場合において、前記第２閉塞部１２（２２）の形状を電線の横断面形状に対応させておくと、貫通孔Ｈ₁に電線が隙間なく挿通されて、前記異物侵入防止の効果が一層高まる。
【００３２】
更に、本発明においては、上記実施例のように、貫通孔Ｈ₁が第２閉塞部１２で閉塞されている場合には、ドライバーＤにより、前記第２閉塞部１２を打ち抜いて貫通孔Ｈ₁を開口させることが必要であるが、この場合において使用されるドライバーＤは、打抜き時の確実性、及び安定性の確保の観点からプラスドライバーであることが好ましいが、マイナスドライバーの使用も可能であると共に、貫通孔Ｈ₁に挿通可能である棒状の工具であれば、ドライバー以外の工具の使用も可能である。
【００３３】
なお、特開平10-42427号公報に開示されている透孔閉塞構造、即ち、除去開口して、ボックスに透孔を形成する閉塞部にマイナスドライバーの先端部が挿通可能な係止孔が設けられている構造において、この係止孔の形成予定部のみを、他の部分よりも薄肉の閉塞部で閉塞して、透孔を形成する場合には、まず、マイナスドライバーの先端部により、前記薄肉閉塞部を破断開口させて係止孔を形成し、その後に、該係止孔にマイナスドライバーの先端部を挿入係止させて、閉塞部を除去して透孔を形成することも可能である。この透孔閉塞構造の採用によって、マイナスドライバーのみが挿入できる係止孔が形成可能な透孔閉塞部を有するボックスを、コンクリート埋設構造に対応可能にできる。
【００３４】
【発明の効果】
本発明によれば、透孔形成予定部に閉塞部が除去可能に設けられ、該閉塞部が除去されて配線・配管材を挿通又は接続させる透孔が形成されるボックスにおいて、工事業者が常時携帯しているプラス又はマイナスのいずれのドライバーの使用も可能であって、閉塞部の連結強度が強くても、連続した一連の動作において前記閉塞部を確実にこじ開けて、透孔を形成できる。
【図面の簡単な説明】
【図１】本発明に係る透孔閉塞構造を有するボックスＢの斜視図である。
【図２】同じく側壁部１に設けられた透孔形成予定部Ｐを示す部分拡大平面図である。
【図３】同じく一部を破断した斜視図である。
【図４】図２のＸ₁−Ｘ₁線断面図である。
【図５】図２のＸ₂−Ｘ₂線断面図である。
【図６】透孔形成予定部Ｐの第２閉塞部１２にプラスドライバーＤを押圧して打ち抜く直前の状態を示す正面模式図である。
【図７】同じく打抜き後の正面模式図である。
【図８】プラスドライバーＤによって第１閉塞部１１をこじ開けている状態を示す正面模式図である。
【図９】同じく平面図である。
【図１０】透孔形成予定部Ｐの第１閉塞部１１が除去されて、透孔Ｈ₀が形成された状態の斜視図である。
【図１１】方形状の第２閉塞部２２を有する透孔形成予定部Ｐを示すボックスＢの部分拡大平面図である。
【図１２】ボックスＢの側壁部１に形成された透孔Ｈ₀にコネクタＣを介して電線管Ａが接続された状態を示す斜視図である。
【符号の説明】
Ｂ：ボックス
Ｄ：プラスドライバー（工具）
Ｄａ：プラスドライバーの軸部
Ｈ₀：透孔
Ｈ₁：貫通孔
Ｐ：透孔形成予定部
Ｔ：プラスドライバーの当接部
１：ボックスの側壁部（透孔形成壁部）
２：ボックスの底壁部
１１，２１：第１閉塞部
１２，２２：第２閉塞部
１３：第１連結部
１４：第２連結部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a through-hole closing structure for a box in which a closing portion is provided in a portion where a through-hole is to be formed in a box so that a through-hole through which a wiring or piping material is inserted or connected is formed by removing the closing portion. And a method for forming a through hole in a box having a through hole closing portion.
[0002]
[Prior art]
Conventionally, a through hole for inserting or connecting wiring and piping material of a box is formed by integrally forming a removable closing portion and closing the same. When using the through hole, the closing portion is removed and opened. ing. This closed portion is generally punched out by hitting with a hammer or the like. In this case, however, there has been a problem that the wall of the box is cracked or broken due to the impact of the hammer.
[0003]
In view of this, the present applicant has proposed a through-hole closing structure for a box that can be removed by removing the closing part by using a screwdriver that is always carried by an electrician or various equipment suppliers (Japanese Patent Laid-Open No. 10-42427). No.). That is, in this through-hole closing structure, a locking hole through which the tip of a flathead screwdriver can be inserted is provided in a closing portion which is opened to form a through-hole in the box.
[0004]
However, in the above-described through hole closing structure, only a flathead screwdriver can be used. Therefore, when only a plus screwdriver is possessed, the opening of the through hole cannot be made, and the tip of the flathead screwdriver is closed. There are problems that it is troublesome to align with the stop hole, that the workability is not good, and that if the connection strength of the closing portion is strong, it is not easy to pry open.
[0005]
In particular, in the case of a box for burying concrete, it is desirable to form a connecting portion over the entire circumference of the closed portion in order to prevent the intrusion of concrete, and in such a case, a large prying force is required in the prying work. It becomes extremely difficult to be required. The connection around the entire circumference of the closed portion is generally formed by a thin burr structure as compared with the related art. However, the thickness of the thin burr varies due to tolerance in manufacturing technology, so that the thin burr is excessively thick. There is also a problem that it becomes difficult to remove the blockage portion or concrete enters due to the formation or the formation of the blockage.
[0006]
In the above-described conventional through-hole closing structure, a locking hole for locking the tip of the flathead screwdriver is always provided in the closing portion, and concrete enters through the locking hole. Not suitable for burying concrete.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to use a plus or minus driver which is always carried by a construction contractor, and can reliably pry open even if the connection strength of the closing portion is strong, and furthermore, the workability is high. An object of the present invention is to provide a through-hole closing structure for a box.
[0008]
[Means for Solving the Problems]
In order to solve this problem, the invention according to claim 1 is characterized in that a closed portion is provided in a portion where a through hole is to be formed in a box so that the closed portion is removed, and a through hole through which a wiring or piping material is inserted or connected is provided. A through-hole closing structure for a box to be formed, which constitutes a part of the box, and a through-hole forming wall portion in which the through-hole is formed, and a breakable second wall for closing the through-hole. A first closing portion formed integrally with the through-hole forming wall portion via a first connecting portion, and a second connecting portion that is broken without breaking the first connecting portion by pressing of a tool such as a driver. A second closing portion formed integrally with the first closing portion and the through hole forming wall portion to form a through portion which is punched out by breaking of the second connecting portion and can penetrate the shaft portion of the tool. with the door, the first closing portion, the shaft portion of the tool that penetrates into the through portion In a state of contact is allowed to the through hole forming wall portion, by rotating with the abutting portion as a fulcrum, the configuration of the ruptured the first connecting portion is removed in order to open the through hole That is its characteristic.
[0009]
Therefore, according to the invention of claim 1, after the second closing portion broken away of the second connecting portion to form a penetrating portion unplug striking Chi by a tool, by inserting the shank of the tool in the through portion In a state where the shaft portion is in contact with the through-hole forming wall portion of the box and the shaft portion is rotated in a direction approaching the through-hole forming wall portion around the corresponding contact portion, the first The connecting portion is broken by the "prying force" acting on the first closing portion. As a result, the first closing portion provided at the portion where the through hole is to be formed of the box is removed, and the through hole is formed.
[0010]
[0011]
[0012]
[0013]
Moreover, because of the invention of claim 2, assuming the first aspect of the present invention, the outer surface of the second closing portion, which is formed lower than an outer surface of the first closing portion and the through hole forming wall, In the removal operation of the second closing portion which is performed first in the through hole forming operation, the positioning of the tip of the tool with respect to the second closing portion is facilitated, and the workability is improved.
[0014]
According to a third aspect of the present invention, based on the premise of the first or second aspect , the first and second connecting portions are formed of the first and second closing portions and the through hole forming wall portion. The space is closed without any gap. As described above, according to the first aspect of the present invention, even when the entire circumferences of the first and second closing portions are connected, the tool pressing operation on the second closing portion and the tool on the first closing portion are performed. The invention according to claim 3 , wherein the prying operation allows the through-hole to be reliably opened in the through-hole forming wall portion of the box, and the first and second connecting portions can be manufactured with a sufficient thickness. Accordingly, it is possible to provide a box capable of reliably preventing concrete from entering.
[0015]
According to a fourth aspect of the present invention, on the premise of any one of the first to third aspects, the through hole forming wall portion is constituted by a side wall portion of a bottomed box having a front opening and a bottom wall portion. Since the penetrating portion is unevenly disposed on the side wall portion of the box on the side of the bottom wall portion, the penetrating portion serves as a turning fulcrum when the tool is turned to pry open the first closing portion. The shaft of the tool is close to the bottom wall having a large deformation resistance. Therefore, a large “prying force” can be applied to the first closing portion, and the forming operation of the through-hole becomes easy. According to a fifth aspect of the present invention, based on any one of the first to fourth aspects, the second closing portion is located on the right side with respect to the center in the left-right direction with respect to a worker facing the box. The second blocking portion can be punched out in a posture where a right-handed worker can easily work. Further, the invention of claim 6 is based on the premise of any one of claims 1 to 5 , characterized in that the tool is a driver, and the contractor always carries the driver, Since the portion is easy to insert into the through portion, the through hole forming operation can be performed reliably.
[0016]
The invention of claim 7 is the premise of any one of the claims 1 to 6, wherein the first closing portion, while allowed to remain, by punching only the second closing part, the electric wire inserted through the through hole It is characterized in that it is used as a hole. For this reason, when the box is not buried in concrete in the wiring behind the wall and the number of wires to be wired is small, it is possible to connect the wires to the box without using a conduit, and to perform the above-described penetration. Since the hole is closed by the electric wire, foreign substances such as dust do not enter the box from the through hole. According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the shape of the second closing portion is substantially U-shaped corresponding to a shaft portion of a tool. In addition, the second closed portion can be penetrated by the tool shaft without any trouble, and the operation of punching the first closed portion by rotating the tool shaft after the penetration can be performed without any trouble. Furthermore, the invention of claim 9 is a method of forming a through hole by punching each of the first and second closing portions in the box having the through hole closing structure according to claim 1. Pressing the tip of the tool against the second closing portion, punching out only the second closing portion in a state where the first closing portion remains, and forming a through portion; and the tool inserted through the through portion. And turning the tool around the contact portion as a fulcrum in a state where the shaft portion is in contact with the through hole forming wall portion, and removing the first closing portion by breaking the first connecting portion. Since the through holes are continuously formed in a series of operations, the operation of removing the first and second closed portions and forming the through holes in the box can be reliably performed. Efficiency is increased.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a perspective view of a box B having a through-hole closing structure according to the present invention, and FIG. 2 is a partially enlarged plan view showing a through-hole forming portion P similarly provided in the side wall portion 1. 3 is a partially broken perspective view, FIG. 4 is a cross-sectional view taken along line X ₁ -X _{1 of} FIG. 2, and FIG. 5 is a cross-sectional view taken along line X ₂ -X ₂ of FIG. First, referring to FIG. 1 to FIG. 5, a description will be given of a through hole closing structure of a box according to the present invention, and thereafter, first and second holes provided in a through hole forming portion P of a box B. each closure 11, 12 is removed, a method for forming a through hole H _0.
[0018]
The box B has a side wall portion 1 and a bottom wall portion 2, and has a structure in which the front surface is opened. Each of the four side wall portions 1 is provided with a through hole forming portion P. When the wiring / piping material is connected to the box B, the portion P where the through hole is to be formed is formed by removing the first and second closing portions 11 and 12 of the portion to form the through hole H _0. a is, if there is no need of forming through holes H ₀ is intact closed state is maintained. The through-hole H ₀ is closed by first and second closing portions 11 and 12. First closing portion 11 is closed most of the through hole H _0, the second closing portion 12 is closed the remaining portion partially. That is, the first closing portion 11 has a shape in which a part of a circular outer periphery is cut off in a substantially closed U shape, and there is no gap in the side wall portion 1 of the box B via the thin first connecting portion 13. While being connected, it is also connected to the second closing portion 12 via the second connecting portion 14 having a small thickness without any gap. Further, the entire circumference of the second closing portion 12 is connected to the first closing portion 11 and the side wall portion 1 of the box B via the second connecting portion 14. As a result, the first and second closing portions 11 and 12 are connected to the other side over the entire circumference thereof, so that the through-hole forming portion P of the box B has a completely closed structure. In addition, the reason why the shape of the second closing portion 12 is substantially U-shaped corresponds to the fact that the cross section of the shaft portion of the driver used for the through hole forming operation is circular.
[0019]
Further, the second closing portion 12 is unevenly distributed on the side of the bottom wall portion 2 along the direction perpendicular to the bottom wall portion 2 of the box B, and when the operator is located behind the box B, It is unevenly distributed on the right side with respect to the center in the left-right direction. The reason for the former is that when the driver D is turned to pry open the first closing portion 11, the turning fulcrum of the driver is located on the side of the bottom wall portion 2 where the deformation resistance is large, and a large “prying force” is obtained. The reason for the latter is that many of the workers are right-handed and correspondingly biased to the right side of the center to facilitate the work.
[0020]
Further, the inner peripheral surface of the through hole H _0, which is formed on the side wall 1 of the box B is that the formed perpendicularly to the side wall 1 of the wall surface (outer surface), the first and second The outer peripheral surface of each of the closed portions 11 and 12 is formed at an obtuse angle with respect to the outer surface of each of the closed portions 11 and 12 except for a connection portion of the first closed portion 11 with the second closed portion 12. I have. The connecting portion of the outer peripheral surface of the first closing portion 11 with the second closing portion 12 is formed perpendicular to the outer surface of the first closing portion 11 so that the second closing portion 12 can be easily separated from the first closing portion 11. I have.
[0021]
3 to 5, the outer surface of the first closing portion 11 is formed slightly lower than the outer surface of the side wall portion 1 of the box B, and the outer surface of the second closing portion 12 is It is formed much lower than the outer surfaces of the portion 11 and the side wall portion 1 of the box B. As a result, a large step is formed on the outer surface of the box B in the portion of the second closing portion 12, and this step is formed when the second closing portion 12 is pressed by the driver D and punched out. Performs positioning function.
[0022]
Regarding the thickness of the first and second connecting portions 13 and 14, the first closing portion 11 is left in the same posture when the second closing portion 12 is punched, that is, Since it is desirable that the first connecting portion 13 is not cut off, the thickness of the first connecting portion 13 is slightly thicker than that of the second connecting portion 14. In FIGS. 2 and 3, the first and second closing portions 11 and 12 and the side wall portion 1 of the box B are larger than the thickness of the first and second connecting portions 13 and 14. The connection is strengthened by the connection reinforcements 15 and 16 which are slightly thick and narrow. In FIG. 1, reference numeral 3 denotes a pair of device mounting bosses provided in the opening of the box B.
[0023]
Subsequently, a description will be given the task of forming a through hole H ₀ to the required portion of the plurality of through holes forming scheduled portion P provided on the box B. First, as shown in FIG. 6, the tip of the shaft Da of the Phillips screwdriver D is applied almost perpendicularly to the second closing portion 12, and in this state, when it is strongly pressed, the second closing portion 12 The thickness of the second connecting portion 14 connecting the first closing portion 11 and the side wall portion 1 of the box B to the first closing portion 11 and the side wall portion 1 of the box B Since the thickness of the connecting first connecting portion 13 is smaller than the first connecting portion 13, the first closing portion 11 remains as it is, and only the second closing portion 12 remains. it is punched through hole H ₁ is opened. Here, since the second closing portion 12 to be punched is formed lower than the first closing portion 11 and a step is provided between the two, the positioning of the distal end of the shaft Da of the driver D is performed. Becomes easier. In the example shown in FIG. 6, after the formation of the through hole H _1, punching piece 12 of the second blocking portion 12 'is slightly in large part of the first connecting portion 13 of the most coupling strength in its entire circumference (See FIG. 10), but the punched piece 12 ′ may be cut off and completely punched out. It is possible that it remains connected to the closure 11. However, the punched piece 12 is in a state of being connected to the first connection part 11 and is connected to the removal piece 11 ′ from which the first connection part 11 has been removed, from the viewpoint of cleaning the construction site and the like. Is preferred.
[0024]
As described above, by punching a second closing portion 12, penetrating to form a hole H _1, as shown in FIG. 7, the shaft portion Da Phillips screwdriver D has its proximal end the through hole H ₁ Is reached. In this state, as shown in FIGS. 8 and 9, the shaft Da of the driver D is slightly pulled up, and the shaft Da is brought into contact with the side of the side wall 1 of the box B close to the bottom wall 2. In this state, when the tip of the shaft portion Da is rotated in the direction approaching the side wall portion 1 around the contact portion T, the first closing portion is closed with respect to the side wall portion 1 of the box B. The first connecting portion 13 connecting the first and second connecting portions 11 is broken by a “prying force” acting on the first closing portion 11. Thus, as shown in FIGS. 10 and 12, the first closing part 11 is removed provided the through hole forming scheduled portion P of the box B, through hole H ₀ of the object is formed. In FIG. 10, reference numeral 11 ′ denotes a cut piece obtained by cutting the first closed portion 11.
[0025]
In the above embodiment, since the through hole H1 is provided unevenly on the side of the bottom wall 2 of the side wall ₁ of the box B, the driver D is turned to pry the first closing portion 11 open. The rotation fulcrum of the driver D is closer to the bottom wall 2 of the box B, which has a large deformation resistance. Accordingly, or to damage the box B, without cracking, it is reacted with a large "prying force" the first closing portion 11, thereby facilitating work of forming holes H _0. Further, in correspondence to the number of operators is right-handed, the through hole H ₁ is unevenly distributed on the right side of the through hole H ₀ to be formed, the uneven distribution arrangement of the through hole H ₁ Also, the work of forming the through holes becomes easier.
[0026]
As described above, after using the plus screwdriver D which is always carried by the contractor, the second closing portion 12 is pressed by the driver D and punched out. 11 can be removed, to quickly hole H ₀ is opened by a series of operations.
[0027]
As described above, in the box provided with the through-hole closing structure of the present invention, the through-hole H ₀ is opened by a continuous series of operations, and the shaft Da of the driver D is connected to the through-hole H _{1 of the} side wall _1. , And the driver D is pivoted with the corresponding contact portion as a fulcrum to pry open and remove the first closing portion 11, so that a large "prying force" causes the entire circumference of the first closing portion 11 to be removed. It can be reliably separated and removed. Therefore, according to the present invention, it is possible to manufacture the first and second connecting portions 13 and 14 in the above embodiment with a sufficient thickness, and to manufacture a box capable of reliably preventing concrete from entering. Becomes possible.
[0028]
Then, as shown in FIG. 12, as described above, in the portion of the hole H _0, which is formed on the side wall 1 of the box B, and the box B, the connector body 31 and the nut member 32 and the sleeve 33 The conduit tube A is connected via a connector C composed of:
[0029]
Further, the box B of the above embodiment is of a concrete buried type in which the entire surface of the portion P to be formed with a through hole is closed by the first and second closing portions 11 and 12, respectively. also the use of boxes except concrete buried is targeted for implementation, in the case of this box, the through hole H ₁ can also be pre-drilled during manufacture.
[0030]
Further, in the above embodiment, the first and second closing portions 11 and 12 are provided with a height difference, and by using the steps, the driver D can press the second closing portion 12 which is pressed and punched out. Although there is an advantage that positioning is easy, in the present invention, it is not an essential configuration to provide a height difference between the first and second closing portions 11 and 12. Also, as for the shape of the second closing portion punched by the driver, the shape corresponding to the cross section of the shaft portion of the driver is the easiest to punch as shown in FIG. As described above, the shape of the second closing portion 22 may be any other shape such as a square shape as long as the shaft portion of the driver can be inserted. In addition, in FIG. 11, 21 shows a 1st closing part.
[0031]
Also, in box B of the embodiment, in Kabeura wiring without concrete embedded, when the electric wire to wire is small, the electric wire inserted through the through hole H ₁ itself second formed by punching a closed section 12 (22) utilized as a pore, the remainder of the first closure portion 11 (21), in a state of being left unchanged, it is also possible to insert wires of the electric wire to the through hole H _1. Thus, without the use of conduits, it becomes possible to connect the wire with respect to the box B, by inserting the wire into the through hole H _1, is closed the through hole H _1, said through invasion of foreign matter such as dust is prevented from hole H ₁ in the box B. Further, when the cross section using an elliptical wire, when allowed to correspond to the shape of the second closing part 12 (22) to the cross-sectional shape of the wire, the wire is inserted without gaps into through-hole H ₁ Thus, the effect of preventing foreign matter from entering is further enhanced.
[0032]
Further, in the present invention, as in the above embodiment, when the through-hole H ₁ is closed by the second closing part 12, by the driver D, the through-hole H ₁ by punching a second closure part 12 The driver D used in this case is preferably a Phillips screwdriver from the viewpoint of ensuring the reliability at the time of punching and stability, but a flathead screwdriver can also be used. with some, if tool can be inserted rod-like into the through hole H _1, the use of other tools drivers are possible.
[0033]
In addition, a through hole closing structure disclosed in Japanese Patent Application Laid-Open No. 10-42427, that is, a locking hole through which the tip of a flat-blade screwdriver can be inserted is provided in a closing portion that is removed and forms a through hole in a box. In the structure, only the portion where the locking hole is to be formed is closed with a thinner closing portion than other portions to form a through hole. It is also possible to form a locking hole by breaking open the thin-walled closing part, and then insert and lock the tip of a flathead screwdriver into the locking hole to remove the blocking part and form a through-hole. is there. By adopting this through-hole closing structure, a box having a through-hole closing portion capable of forming a locking hole into which only a flathead screwdriver can be inserted can be adapted to a concrete buried structure.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a contractor is always provided in the box in which the closing part is provided in the through-hole forming scheduled part so that the closing part can be removed, and the closing part is removed and the through-hole for inserting or connecting the wiring and piping material is formed. It is possible to use either a plus or minus screwdriver that is carried, and even if the connection strength of the closing portion is high, the closing portion can be reliably opened in a series of continuous operations to form a through hole.
[Brief description of the drawings]
FIG. 1 is a perspective view of a box B having a through-hole closing structure according to the present invention.
FIG. 2 is a partially enlarged plan view showing a through hole forming portion P provided in the side wall portion 1;
FIG. 3 is a perspective view with a part cut away.
FIG. 4 is a sectional view taken along line X ₁ -X ₁ of FIG. 2;
FIG. 5 is a sectional view taken along line X ₂ -X _{2 in} FIG. 2;
FIG. 6 is a schematic front view showing a state immediately before a plus driver D is pressed against the second closing portion 12 of the portion P to be formed with a through hole and punched out.
FIG. 7 is a schematic front view after punching.
FIG. 8 is a schematic front view showing a state where the first closing portion 11 is prying open by a Phillips screwdriver D.
FIG. 9 is a plan view of the same.
FIG. 10 is a perspective view showing a state in which a first blocking portion 11 of a portion P to be formed with a through hole is removed to form a through hole H ₀ .
FIG. 11 is a partially enlarged plan view of a box B showing a to-be-formed hole forming portion P having a rectangular second closing portion 22;
12 is a perspective view showing a state in which the conduit A is connected via a connector C to the through hole H _0, which is formed on the side wall 1 of the box B.
[Explanation of symbols]
B: Box D: Phillips screwdriver (tool)
Da: Shaft portion of the Phillips screwdriver H ₀ : Through-hole H ₁ : Through-hole P: Planned portion for forming a through-hole T: Contact portion of Phillips screwdriver 1: Side wall portion of box (through-hole forming wall portion)
2: Bottom walls 11, 21 of the box: first closing parts 12, 22: second closing part 13: first connecting part 14: second connecting part

Claims

A closed hole is provided at a portion where a through hole is to be formed in the box so that the closed portion is removed, and the closed portion is removed to form a through hole for inserting or connecting a wiring or piping material.
A hole forming wall portion forming a part of the box, wherein the hole is formed, and the hole forming wall portion via a breakable first connecting portion to close the hole. A first closing portion formed integrally,
Integrally formed with the second the first closing portion through the connecting portion and the through hole forming wall portion being broken without breaking the first connection part by the pressing tool such as a screwdriver, the second connecting portion A second closing portion for forming a penetrating portion that is punched out by breaking of the tool and can penetrate the shaft portion of the tool,
The first closing portion is configured to rotate the shaft portion of the tool penetrating through the through portion with the contact portion as a fulcrum in a state where the shaft portion of the tool is in contact with the through-hole forming wall portion. (1) A through hole closing structure for a box, wherein the structure is removed so as to open the through hole by breaking the connecting portion.

The outer surface of the second closure portion, to allow positioning of the tool tip, that is formed lower than an outer surface of the first closing portion and the through hole forming wall portions to claim 1, wherein The through hole closing structure of the box according to the above.

The first and second connecting portions are provided so as to close without gaps between the first and second closing portions and the through-hole forming wall portion in order to prevent concrete from entering the box. The through-hole closing structure for a box according to claim 1 or 2 , wherein:

The through-hole forming wall portion is configured by a side wall portion of a bottomed box having a front opening and a bottom wall portion,
The through-hole closing structure for a box according to any one of claims 1 to 3 , wherein the penetrating part is arranged unevenly on the side wall part side of the box on the side of the bottom wall part.

The transparent box according to any one of claims 1 to 4, wherein the second closing portion is biased rightward with respect to a center in the left-right direction with respect to a worker facing the box. Hole closure structure.

The through-hole closing structure for a box according to any one of claims 1 to 5 , wherein the tool is a screwdriver.

7. The box according to claim 1, wherein the first closing portion is left as it is, and only the second closing portion is punched out, and the through hole is used as an electric wire insertion hole. 8. Hole closure structure.

The through-hole closing structure for a box according to any one of claims 1 to 7, wherein the shape of the second closing portion is a substantially closed U-shape corresponding to a shaft portion of the tool.

The box having a through hole closing structure according to claim 1, wherein the first and second closing portions are punched out to form a through hole.
Pressing the tip of a tool such as a screwdriver against the second closing portion, punching out only the second closing portion in a state where the first closing portion remains, and forming a penetrating portion; In a state where the shaft portion of the tool is in contact with the through-hole forming wall portion, the tool is rotated around the contact portion as a fulcrum, and the first closing portion is removed by breaking the first connecting portion. A method for forming a through hole in a box having a through hole closing portion, wherein the operation and the operation are continuously performed in a series of operations to form the through hole.