JP3916735B2

JP3916735B2 - Branch closure device

Info

Publication number: JP3916735B2
Application number: JP26095997A
Authority: JP
Inventors: 実澤田
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 1997-09-08
Filing date: 1997-09-08
Publication date: 2007-05-23
Anticipated expiration: 2017-09-08
Also published as: JPH1182852A

Description

【０００１】
【発明の属する技術分野】
本発明は、流体管に穿設された分岐口を閉塞するための閉塞装置の改良に関する。
【０００２】
【従来の技術】
例えば、水道管等の流体管に接続されている分岐管は、施工した後何らかの事情で撤去する必要が生じることがあり、その際は、流体管内の水道水の流れを止めないで、すなわち不断水状態で分岐口を閉塞する必要がある。
【０００３】
本願出願人は、この際に用いられる閉塞装置を開発し、既に特許出願している（特開平７−２１７７８４号参照）。
【０００４】
この先願のものにおいて別実施例として開示されている閉塞装置は、図９に示すように、閉塞装置ａ全体を流体管ｂの分岐口ｃより抜止めする手段は、押え駒ｄのガイド溝ｅ内に半径方向に摺動可能として収容された１対の係止片ｆの各内端上縁の傾斜面ｇに、押え駒ｄ内に摺動可能に収容された軸ｈの先端のテーパ面ｉを当接させ、軸ｈを押込むことにより、そのテーパ面ｉにより両係止片ｆを管軸方向に押動してその先端部をガイド溝ｅより突出させ、流体管ｂの内壁に係止させるように構成されている。
【０００５】
【発明が解決しようとする課題】
上述した従来の閉塞装置では、両係止片ｆを内方に復帰させて流体管ｂとの係合を解除する手段が設けられていないため、閉塞装置を取外す必要が生じた際にそれが不可能であり、再使用したり、パッキン等の保守点検ができなかった。
【０００６】
また、閉塞装置を流体管ｂの側壁の分岐口に装着する際、係止片ｆや軸ｈの自重によりガイド溝ｅより突出するのを防止するために、粘着テープ等によりガイド溝ｅの開口部を塞いでおく必要があり、その作業が煩雑であった。
【０００７】
本発明は、上記問題点を解決するためになされたもので、係止片を進退させる作動駒を付加することにより、流体管との係脱が自在で、かつ自重によるストッパの突出を防止することができるようにした分岐口の閉塞装置を提供することを目的としている。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明の分岐口の閉塞装置は、流体管に穿設された分岐口内に挿入可能な押え駒と、この押え駒の外周面に嵌合され、かつ内方の端面が押え駒の先端の拡径部と当接するパッキンと、前記押え駒に、移動手段によって相対移動可能に設けられ、かつ前記パッキンの外方の端面を押圧して径方向に弾性変形させることにより、その外周面を前記分岐口に圧設させるパッキン押えと、前記押え駒内に管軸方向に移動可能として設けられ、かつ先端部が押え駒より突出することにより、流体管の内周面に係合しうる少くとも１対の係止部材とを備える分岐口の閉塞装置において、
前記押え駒内には、側面視ほぼ三角板状をなす作動駒が収容され、該作動駒には、その外周面に末広がり状に傾斜する案内面が形成されるとともに、その頂部に連設した角軸部を、押え駒の角形の軸孔に対して相対回転不能に貫設させており、該作動駒を押え駒内に収容した圧縮コイルばねにより流体管の外方に向かって付勢するとともに、前記角軸部を前記押え駒の外部から操作することによって、前記作動駒が角軸部の軸方向に移動可能に構成されており、
前記少くとも１対の係止部材同士を、引張り手段をもって互いに接近する方向に付勢して連係するとともに、前記係止部材の基端面が、前記作動駒の案内面上に摺動可能に当接されており、
係止部材の基端部に切欠溝を形成するとともに、作動駒の案内面の先端部にストッパ部を形成し、前記切欠溝と前記ストッパ部とが、作動駒の最外方への移動時に係合し、係止部材を突出状態に保持するようにしたことを特徴としている。
【０００９】
本発明の分岐口の閉塞装置は、流体管に穿設された分岐口内に挿入可能な押え駒と、この押え駒の外周面に嵌合され、かつ内方の端面が押え駒の先端の拡径部と当接するパッキンと、前記押え駒に、移動手段によって相対移動可能に設けられ、かつ前記パッキンの外方の端面を押圧して径方向に弾性変形させることにより、その外周面を前記分岐口に圧設させるパッキン押えと、前記押え駒内に管軸方向に移動可能として設けられ、かつ先端部が押え駒より突出することにより、流体管の内周面に係合しうる少くとも１対の係止部材とを備える分岐口の閉塞装置において、
前記押え駒内には、円錐形状をなす作動駒が収容され、該作動駒には、その外周面に末広がり状に傾斜する案内面が形成されるとともに、その頂部に連設したねじ杆を、押え駒に対して相対回転可能に螺合させており、該ねじ杆を前記押え駒の外部から操作することによって、前記作動駒がねじ杆の軸方向に移動可能に構成されており、
前記少くとも１対の係止部材同士を、引張り手段をもって互いに接近する方向に付勢して連係するとともに、前記係止部材の基端面が、前記作動駒の案内面上に摺動可能に当接されており、
係止部材の基端部に切欠溝を形成するとともに、作動駒の案内面の先端部にストッパ部を形成し、前記切欠溝と前記ストッパ部とが、作動駒の最外方への移動時に係合し、係止部材を突出状態に保持するようにしたことを特徴としている。
【００１２】
上記係止部材と作動駒の案内面との互いの摺接面の少くともいずれか一方を、硬質かつ摩擦係数の小さな材料により被覆するのが好ましい。
【００１３】
本発明のによると、押え駒内に管軸方向に移動可能として設けられた例えば１対の係止部材同士を、引張り手段により連係し、かつ両係止部材の基端を、軸方向に移動可能な作動駒の末広がり状に傾斜する案内面上に摺接させたことにより、作動駒を軸方向に移動させるだけで、両係止部材は管軸方向に容易に進退移動させられ、流体管との係脱を自在に行うことができる。
【００１４】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明する。
【００１５】
図１は、本発明の閉塞装置Ａを、水道本管１の分岐口１ａに装着した状態（割Ｔ字管及び分岐管を撤去した状態）を示す中央縦断正面図、図２は、同じく側面図である。
【００１６】
両図において、２は押え駒で、分岐口１ａより小径の厚肉円板状の駒本体３と、その下面に複数のボルト４により固着されたパッキン支持駒５とからなっている。
【００１７】
駒本体３の中心に上向連設された操作軸３ａの外周面の上半部と下半部には、それぞれ小径雄ねじ６と大径雄ねじ７とが形成され、また大径雄ねじ７側の操作軸３ａの管軸方向の両側面は、平削面３ｂとしてある。
【００１８】
駒本体３の中心には、四角形の軸孔８が貫設され、その下端部は、八字形断面のテーパ孔９となっている。
【００１９】
パッキン支持駒５は、上半部が駒本体３とほぼ等外径をなし、下半部には、下向円弧状に湾曲する拡径部５ａが連設されている。
【００２０】
パッキン支持駒５の上面中央には、管軸方向に長い矩形をなす有底孔１０が形成され、また有底孔１０における管軸方向の両端に連なる上面には、有底孔１０の短辺と等幅をなす１対の案内溝１１が、管軸方向に向かって形成されている。
【００２１】
駒本体３の上部には、キャップ状のパッキン押え１２が上下に摺動可能として嵌合され、その中心に穿設された小判形の貫通孔１３は、操作軸３ａの下半部に相対回転不能かつ上下に移動可能として嵌合されている。
【００２２】
パッキン押え１２の上面には、操作軸３ａの大径雄ねじ７に螺挿されたナット１４の下面が当接しており、ナット１４を回転することにより、押え駒２とパッキン押え１２とを相対的に移動させることができる。
【００２３】
駒本体の軸孔８とテーパ孔９、及びパッキン支持駒５の有底孔１０内には、下端部に側面視三角板状のスライド板１５ａを有し、かつその頂部に上向きに連設されたガイド軸の上部が角軸部１５ｂとなったステンレス製の作動駒１５が、角軸部１５ｂを軸孔８に摺動可能に嵌合することにより、上下動可能に収容されている。
【００２４】
スライド板１５ａの中央には、下端が開口する上向きの有底孔１６が形成され、この有底孔１６内には、圧縮コイルばね１７が収容されている。これにより、作動駒１５全体は上向きに付勢され、分岐口１ａ内に挿入される前の状態においては、スライド板１５ａのほぼ４５度に傾斜する末広がり状の両案内面１５ｃが、駒本体３のテーパ孔９と当接する上限位置まで押し上げられている（図６参照）。
【００２５】
上記パッキン支持駒５の両案内溝１１には、ステンレス製の１対の係止板１８が、管軸方向にスライド可能として嵌合されている。
【００２６】
各係止板１８は、図３及び図４に拡大して示すように、その基端部下面の傾斜面１８ａが、作動駒１５の各案内面１５ｃに接触している。
【００２７】
両係止板１８同士は、各基端部の作動駒１５を挟む両側端に形成された係止溝１９の対向部同士に、それぞれ引張りコイルばね２０の両端を係止することにより互いに連係されている。なお、引張りコイルばね２０のばね定数は、上記圧縮コイルばね１７のそれよりも十分小さくしてある。
【００２８】
各係止板１８の基端部下面には逆Ｌ字状の切欠溝２１が形成され、この切欠溝２１は、作動駒１５が上限位置まで移動した際、スライド板１５ａの下部両端に形成された水平をなすストッパ部２２と自動的に係合して係止されるようになっている。
【００２９】
上記押え駒２の外周面には、ゴム製のパッキン２３が嵌合されており、パッキン支持駒５の拡径部５ａとパッキン押え１２とにより挟圧されるようになっている。
【００３０】
次に、上記実施例の閉塞装置Ａを水道本管１の分岐口１ａに装着する際の要領について説明する。
【００３１】
まず、分岐口１ａの周囲の水道本管１に装着された割Ｔ字管に取付けた制水弁により、分岐管側への水の流れを遮断して分岐管を取外したのち、閉塞装置Ａの装着装置を取付ける。
【００３２】
なお、上記分岐管を不断水状態で撤去する工法は、本願出願人らが既に種々提案しており、これと同じ要領で行われるので、割Ｔ字管や制水弁、分岐管等の図示を省略する。
【００３３】
また、閉塞装置Ａの装着装置についても、特開平７−２１７７８４号公報に開示されているものとほぼ同じ構成のものを用いて行いうるので、その図示及び詳細な説明を省略する。
【００３４】
上記装着装置のロッドの先端に、閉塞装置Ａの小径雄ねじ６を螺合して支持する。この際、図１及び図２に示すように、ナット１４を緩めて押え駒２全体を下方に移動させ、パッキン２３が挟圧されないようにしておく。
【００３５】
ついで、装着装置の押込ロッドの先端を操作軸３ａの軸孔８に挿入して、作動駒１５の角軸部１５ｂを押圧し、作動駒１５を圧縮コイルばね１７を圧縮させて下限位置まで押し下げる。
【００３６】
これにより、作動駒１５の両案内面１５Ｃに摺接している各係止板１８は、引張りコイルばね２０により引かれ、図２に示すように、案内面１５ｃの上端と当接するまで内方に引き込まれ、パッキン支持駒５の案内溝１１内に収容される。
【００３７】
この状態で閉塞装置Ａ全体を分岐口１ａ内に挿入し、パッキン押え１２を水道本管１の外周面に当接させる（図２参照）。
【００３８】
ついで、ナット１４を回転させて押え駒２全体を引き上げると同時に、それまで押圧していた作動駒１５を解放させる。すると、図５及び図６に示すように、パッキン２３が、パッキン支持駒５の拡径部５ａとパッキン押え１２とにより圧縮され、その外周面が分岐口１ａに圧接することによりこれが閉塞される。
【００３９】
一方、作動駒１５が、圧縮コイルばね１７の付勢力により上限位置まで押し上げられることにより、各係止板１８は、作動駒１５の案内面１５ｃ上を引張りコイルばね２０に抗して摺動して管軸方向に押動させられ、先端がパッキン支持駒５の案内溝１１より突出する。
【００４０】
これにより、閉塞装置Ａに分岐口１ａよりの抜出し力が作用しても、両係止板１８が水道本管１の内周面に係合することにより抜け止めされる。
【００４１】
なお、作動駒１５が上限位置まで押し上げられ、両係止板１８が案内面１５ｃの下端に到達した際において、係止板１８の切欠溝２１が作動駒１５のストッパ部２２と自動的に係合することにより、また係合時における引張りコイルばね２０の付勢力により、係止板１８は突出状態に保持される。
【００４２】
分岐口１ａを閉塞装置Ａにより閉塞したのち、割Ｔ字管、制水弁及び装着装置等を取外せば、図５及び図６に示す使用状態となる。
【００４３】
万一、閉塞装置Ａを分岐口１ａより取外す必要が生じた際には、作動駒１５の角軸部１５ｂを強く押圧して作動駒１５を下限位置まで押し下げ、係止板１８の切欠溝２１とストッパ部２２との係合を解除したのち、ナット１４を緩めてパッキン２３の圧縮力を解放すればよい。
【００４４】
すなわち、作動駒１５を押圧することにより、両係止板１８は、引張りコイルばね２０により、案内面１５ｃの上端に位置するまで引き込まれ、図２に示すように案内溝１１内に収容されて水道本管１との係合が解除されるため、閉塞装置Ａを分岐口１ａより容易に取外すことができる。
【００４５】
以上説明したように、上記実施例の閉塞装置Ａにおいては、進退手段である作動駒１５の案内面１５ｃの作用により、両係止板１８を管軸方向に進退させて、水道本管１との係脱を自在に行いうるので、閉塞装置Ａを取外して再使用したり、パッキン２３等の保守点検が可能となる。
【００４６】
また、両係止板１８同士は、引張りコイルばね２０により互いに連係されているため、閉塞装置Ａを水道本管１の側壁に穿設された分岐口に装着する際でも、係止板１８が自重により案内溝１１より突出する不都合は解消される。
【００４７】
本発明は、上記実施例に限定されるものではない。
【００４８】
上記実施例では、作動駒１５と係止板１８とは金属同士の接触面としてあるが、例えば図７に示すように、作動駒１５の案内面１５ｃとストッパ部２２の表面を、ポリアセタール、ポリアミド樹脂、超高分子量ポリエチレン等の硬質かつ低摩擦係数の合成樹脂材２４によりコーティングするかモールドし（右方は図示略）、係止板１８との接触面の摩擦抵抗を小さくするようにしてもよい。
【００４９】
このようにすると、両係止板１８の進退移動が円滑となることから、作動駒１５を上方に付勢する圧縮コイルばね１７や引張りコイルばね２０のばね定数を小さくすることが可能となり、その結果、作動駒１５の操作力も小さくて済む。
【００５０】
なお、上述のような合成樹脂材２４を、係止板１８の傾斜面１８ａにも設けてもよく、このようにすると、係止板１８の進退移動はより円滑となる。
【００５１】
図８は、上記係止板と作動駒の変形例を示す。
【００５２】
この例では、作動駒２５を、下端にストッパ部２５ａを有する円錐形とするとともに、その頂部に雄ねじ杆２６を連設し、この雄ねじ杆２６を、駒本体３における軸孔８に形成した雌ねじ（図示略）に螺合し、雄ねじ杆２６の上端部に形成した角孔２７に操作ロッドを挿入して回転させることにより、ねじ送りにより上下動させうるようにしてある。
【００５３】
一方、両係止板２８の基端部を円弧状とするとともに、その下面に形成した傾斜面２８ａを、上記作動駒２５のテーパ状の案内面２５ｂに接触させてある。両係止板２８同士は、上記実施例と同様、１対の引張りコイルばね２９により連結されている。
【００５４】
作動駒２５を例えば左回転させて、上方に引き上げると、上記と同様、両係止板２８が案内面２５ｂに沿ってその下端まで移動させられることにより、パッキン支持駒５の案内溝１１より突出する。この状態で、係止板２８の切欠溝２８ｂがストッパ部２５ａと係合し、突出状態に保持される。
【００５５】
上記と反対に作動駒２５を右回転させて、下限位置まで移動すると、両係止板２８は案内面２５ｂの上方に変位させられるとともに、引張りコイルばね２９の付勢力により内方に引かれ、案内溝１１内に収容される。
【００５６】
なお、この変形例においても、作動駒２５と係止板２８との互いの摺動面のいずれか一方又は両方に、上記のような合成樹脂材２４をコーティング等してもよい。
【００５７】
この変形例では、作動駒２５の回り止め手段を設ければ、係止板２８の切欠溝２８ｂ及び作動駒２５のストッパ部２５ａは省略することもできる。
【００５８】
また、前述した三角板状の作動駒１５を用いる際でも、圧縮コイルばね１７の定数を、引張りコイルばね２０の引張り力に勝るように十分に大きくすれば、係止板１８の切欠溝２１や作動駒１５のストッパ部２２を省略することができる。
【００５９】
なお、実施例１においては、作動駒１５、２５を下方から上方へ向けて移動させているが、図９の従来例に示されるように上方から下方へ向けて移動させることも可能である。
【００６０】
【発明の効果】
本発明によれば、次のような効果が得られる。
【００６１】
請求項１の発明によると、作動駒を角軸部の軸方向へ移動すると、両係止部材は管軸方向に進退移動させられ、流体管との係脱がなされるので、閉塞装置全体を取外して再使用したり、保守点検が容易となる。また、係止部材同士は、引張り手段により互いに連係されているので、押え駒より妄りに突出する恐れはない。また、作動駒を外部より単に押圧するだけで、係止部材を進退移動させることができる。また、作動駒の最外方への移動時に、係止部材を突出させた状態でロック保持しうるので、振動や流体圧等により係止部材と流体管との係合が解除される恐れがない。
【００６２】
請求項２の発明によると、作動駒をねじ杆の軸方向へ移動すると、両係止部材は管軸方向に進退移動させられ、流体管との係脱がなされるので、閉塞装置全体を取外して再使用したり、保守点検が容易となる。また、係止部材同士は、引張り手段により互いに連係されているので、押え駒より妄りに突出する恐れはない。また、作動駒が回転しながら移動するため、係止部材の進退移動が円滑となる。また、作動駒の最外方への移動時に、係止部材を突出させた状態でロック保持しうるので、振動や流体圧等により係止部材と流体管との係合が解除される恐れがない。
【００６５】
請求項３の発明によると、係止部材と作動駒の案内面との摩擦抵抗が小さくなるため、係止部材の進退移動や作動駒の移動が円滑となり、引張り手段のばね力や作動駒の操作力が小さくて済むことから、作業性が向上する。
【００６６】
【図面の簡単な説明】
【図１】本発明の実施例における分岐口の閉塞前及び係止板の突出前の状態を示す中央縦断正面図である。
【図２】同じく中央縦断側面図である。
【図３】係止板と作動駒との連係状態を示す拡大側面図である。
【図４】同じく一部切欠平面図である。
【図５】分岐口の閉塞時及び係止板を突出させた状態を示す中央縦断正面図である。
【図６】同じく中央縦断側面図である。
【図７】作動駒の案内面を合成樹脂材により被覆した例を示す要部の拡大断面図である。
【図８】作動駒の変形例を示す斜視図である。
【図９】従来の閉塞装置の中央縦断側面図である。
【符号の説明】
１水道本管（流体管）
１ａ分岐口
２押え駒
３駒本体
３ａ操作軸
４ボルト
５パッキン支持駒
６小径雄ねじ
７大径雄ねじ
８軸孔
９テーパ孔
１０有底孔
１１案内溝
１２パッキン押え
１３貫通孔
１４ナット
１５作動駒（進退手段）
１５ａスライド板
１５ｂ角軸部
１５ｃ案内面（摺接面）
１６有底孔
１７圧縮コイルばね
１８係止板（係止部材）
１８ａ傾斜面（基端面）
１９係止溝
２０引張りコイルばね（引張り手段）
２１切欠溝
２２ストッパ部
２３パッキン
２４合成樹脂材
２５作動駒
２５ａストッパ部
２５ｂ案内面（摺接面）
２６雄ねじ杆
２７角孔
２８係止板（係止部材）
２８ａ傾斜面（基端面）
２８ｂ切欠溝
２９引張りコイルばね（引張り手段） [0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a closing device for closing a branch port formed in a fluid pipe.
[0002]
[Prior art]
For example, branch pipes connected to fluid pipes such as water pipes may need to be removed for some reason after construction. In that case, do not stop the flow of tap water in the fluid pipes. It is necessary to close the branch port in the water state.
[0003]
The applicant of the present application has developed an occlusion device used in this case and has already filed a patent application (see JP-A-7-217784).
[0004]
As shown in FIG. 9, the closing device disclosed as another embodiment in this prior application is provided with a means for retaining the entire closing device a from the branch port c of the fluid pipe b. A tapered surface of the tip end of the shaft h slidably received in the presser piece d on the inclined surface g of the upper edge of each inner end of the pair of locking pieces f accommodated slidable in the radial direction. i is brought into contact and the shaft h is pushed in, so that both the locking pieces f are pushed in the direction of the tube axis by the taper surface i so that the tip portion protrudes from the guide groove e and is formed on the inner wall of the fluid tube b. It is configured to be locked.
[0005]
[Problems to be solved by the invention]
In the conventional closing device described above, there is no means for releasing the engagement with the fluid pipe b by returning both the locking pieces f inward, so when it becomes necessary to remove the closing device, It was impossible, and it could not be reused or checked for maintenance such as packing.
[0006]
Further, when the closing device is mounted on the branch port on the side wall of the fluid pipe b, the guide groove e is opened with an adhesive tape or the like in order to prevent the locking piece f or the shaft h from protruding from the guide groove e. It was necessary to block the part, and the work was complicated.
[0007]
The present invention has been made to solve the above problems, and by adding an operating piece for moving the locking piece forward and backward, it can be freely engaged with and disengaged from the fluid pipe and prevents the stopper from protruding due to its own weight. It is an object of the present invention to provide a closing device for a branch port that can be used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a closing device for a branch port according to the present invention includes a presser piece that can be inserted into a branch port formed in a fluid pipe, and an inner end face that is fitted to the outer peripheral surface of the presser piece. Is provided with a packing that comes into contact with the enlarged diameter portion at the tip of the presser piece, and is provided in the presser piece so as to be relatively movable by a moving means, and by pressing the outer end face of the packing to elastically deform it in the radial direction, A packing presser that pressurizes the outer peripheral surface of the branch port, and a presser foot that is movable in the direction of the tube axis and that has a tip projecting from the presser foot, thereby engaging the inner peripheral surface of the fluid pipe. In a closing device for a branch port comprising at least one pair of locking members that can be combined,
In the presser piece, an operation piece having a substantially triangular plate shape in side view is accommodated, and a guide surface inclined in a divergent shape is formed on the outer peripheral surface of the operation piece, and a corner provided continuously to the top portion thereof. The shaft portion is penetrated so as not to rotate relative to the rectangular shaft hole of the presser piece, and the operating piece is urged toward the outside of the fluid pipe by a compression coil spring accommodated in the presser piece, By operating the angular shaft portion from the outside of the presser piece, the operation piece is configured to be movable in the axial direction of the angular shaft portion,
The at least one pair of locking members are urged and linked in a direction approaching each other by a pulling means, and the base end surface of the locking member is slidably abutted on the guide surface of the operating piece. Has been
A notch groove is formed at the base end portion of the locking member, and a stopper portion is formed at the distal end portion of the guide surface of the operating piece, and the notch groove and the stopper portion are engaged when the operating piece moves to the outermost side. The locking member is held in a protruding state .
[0009]
The branch port closing device according to the present invention includes a presser piece that can be inserted into a branch port formed in a fluid pipe, an outer peripheral surface of the presser piece, and an inner end surface that is an enlarged diameter portion at the front end of the presser piece. The outer circumferential surface of the packing is abutted on the branch port by pressing the outer end surface of the packing and elastically deforming it in the radial direction. At least a pair of packing pressers to be press-fitted and provided in the presser piece so as to be movable in the direction of the pipe axis and engaging the inner peripheral surface of the fluid pipe by protruding the tip from the presser piece. In the closing device of the branch port provided with a locking member,
In the presser piece, a cone-shaped operating piece is accommodated, and the operating piece is formed with a guide surface inclined in a divergent shape on the outer peripheral surface thereof, and a screw rod connected to the top thereof is provided. It is screwed so as to be rotatable relative to the presser piece, and the operating piece is configured to be movable in the axial direction of the screw 杆 by operating the screw 該 from the outside of the presser piece.
The at least one pair of locking members are urged and linked in a direction approaching each other by a pulling means, and the base end surface of the locking member is slidably abutted on the guide surface of the operating piece. Has been
A notch groove is formed at the base end portion of the locking member, and a stopper portion is formed at the distal end portion of the guide surface of the operating piece, and the notch groove and the stopper portion are engaged when the operating piece moves to the outermost side. The locking member is held in a protruding state .
[0012]
It is preferable that at least one of the sliding surfaces of the locking member and the guide surface of the operating piece is covered with a material that is hard and has a small coefficient of friction.
[0013]
According to the present invention, for example, a pair of locking members provided in the presser piece so as to be movable in the tube axis direction are linked by the pulling means, and the base ends of both locking members are moved in the axial direction. By sliding on the guide surface that is inclined in the shape of the wide end of the possible operating piece , both the locking members can be easily moved forward and backward in the axial direction of the pipe by simply moving the operating piece in the axial direction. Can be freely engaged and disengaged.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
FIG. 1 is a central longitudinal front view showing a state in which the closing device A of the present invention is attached to a branch port 1a of a water main pipe 1 (a state where a split T-shaped pipe and a branch pipe are removed), and FIG. FIG.
[0016]
In both figures, reference numeral 2 denotes a presser piece, which comprises a thick disk-shaped piece main body 3 having a diameter smaller than that of the branch port 1a, and a packing support piece 5 fixed to the lower surface thereof by a plurality of bolts 4.
[0017]
A small-diameter male screw 6 and a large-diameter male screw 7 are respectively formed on the upper half and the lower half of the outer peripheral surface of the operation shaft 3a that is continuously connected upward at the center of the piece main body 3. Both side surfaces of the operation shaft 3a in the tube axis direction are the planing surfaces 3b.
[0018]
A rectangular shaft hole 8 is provided in the center of the piece body 3, and a lower end portion thereof is a tapered hole 9 having an octagonal cross section.
[0019]
The packing support piece 5 has an upper half substantially the same outer diameter as the piece main body 3, and a diameter-expanded portion 5 a curved in a downward arc shape is continuously provided in the lower half.
[0020]
A bottomed hole 10 having a rectangular shape that is long in the tube axis direction is formed at the center of the upper surface of the packing support piece 5, and a short side of the bottomed hole 10 is formed on the upper surface of the bottomed hole 10 that is continuous with both ends in the tube axis direction. A pair of guide grooves 11 having the same width as each other are formed toward the tube axis direction.
[0021]
A cap-shaped packing presser 12 is fitted to the upper portion of the piece body 3 so as to be slidable up and down, and an oval through-hole 13 drilled in the center thereof is rotated relative to the lower half of the operation shaft 3a. The fitting is impossible and movable up and down.
[0022]
The lower surface of the nut 14 screwed into the large-diameter male screw 7 of the operation shaft 3 a is in contact with the upper surface of the packing presser 12. By rotating the nut 14, the presser piece 2 and the packing presser 12 are relatively moved. Can be moved to.
[0023]
The shaft hole 8 and the taper hole 9 of the piece main body, and the bottomed hole 10 of the packing support piece 5 have a triangular plate-like slide plate 15a at the lower end portion, and are continuously provided upward at the top portion thereof. A stainless steel operating piece 15 having an upper portion of the guide shaft serving as a square shaft portion 15b is accommodated in a vertically movable manner by fitting the square shaft portion 15b into the shaft hole 8 so as to be slidable.
[0024]
An upward bottomed hole 16 having an open lower end is formed in the center of the slide plate 15a, and a compression coil spring 17 is accommodated in the bottomed hole 16. As a result, the entire operating piece 15 is urged upward, and in a state before being inserted into the branch port 1a, the two diverging guide surfaces 15c inclined at about 45 degrees of the slide plate 15a are formed by the piece body 3 It is pushed up to the upper limit position which contacts the taper hole 9 (see FIG. 6).
[0025]
In both guide grooves 11 of the packing support piece 5, a pair of stainless locking plates 18 are fitted so as to be slidable in the tube axis direction.
[0026]
As shown in FIG. 3 and FIG. 4 in an enlarged manner, each locking plate 18 has an inclined surface 18 a on the lower surface of the base end portion in contact with each guide surface 15 c of the operating piece 15.
[0027]
The two locking plates 18 are linked to each other by locking both ends of the tension coil spring 20 to opposing portions of the locking grooves 19 formed on both side ends sandwiching the operation piece 15 of each base end portion. ing. The spring constant of the tension coil spring 20 is sufficiently smaller than that of the compression coil spring 17.
[0028]
A reverse L-shaped notch groove 21 is formed on the lower surface of the base end portion of each locking plate 18, and the notch groove 21 is formed at both lower ends of the slide plate 15a when the operating piece 15 moves to the upper limit position. The horizontal stopper portion 22 is automatically engaged and locked.
[0029]
A rubber packing 23 is fitted on the outer peripheral surface of the presser piece 2 and is clamped by the enlarged diameter portion 5 a of the packing support piece 5 and the packing presser 12.
[0030]
Next, a procedure for mounting the closing device A of the above embodiment on the branch port 1a of the water main pipe 1 will be described.
[0031]
First, after the branch pipe is removed by blocking the water flow to the branch pipe side by the water control valve attached to the split T-shaped pipe attached to the water main pipe 1 around the branch port 1a, the blocking device A Install the mounting device.
[0032]
In addition, since the present applicants have already proposed various methods for removing the branch pipe in an undisturbed water state and are performed in the same manner, the illustration of the split T-shaped pipe, the water control valve, the branch pipe, etc. Is omitted.
[0033]
Also, the attachment device for the closure device A can be performed using a device having substantially the same structure as that disclosed in Japanese Patent Application Laid-Open No. 7-217784, and therefore its illustration and detailed description are omitted.
[0034]
The small diameter male screw 6 of the closing device A is screwed onto and supported by the tip of the rod of the mounting device. At this time, as shown in FIGS. 1 and 2, the nut 14 is loosened and the entire presser piece 2 is moved downward so that the packing 23 is not pinched.
[0035]
Next, the tip of the push rod of the mounting device is inserted into the shaft hole 8 of the operation shaft 3a, the angular shaft portion 15b of the operating piece 15 is pressed, and the operating piece 15 is compressed to the compression coil spring 17 and pushed down to the lower limit position. .
[0036]
As a result, the locking plates 18 that are in sliding contact with both guide surfaces 15C of the operating piece 15 are pulled by the tension coil spring 20 and inward until they come into contact with the upper end of the guide surface 15c, as shown in FIG. It is retracted and accommodated in the guide groove 11 of the packing support piece 5.
[0037]
In this state, the entire closing device A is inserted into the branch port 1a, and the packing presser 12 is brought into contact with the outer peripheral surface of the water main pipe 1 (see FIG. 2).
[0038]
Next, the nut 14 is rotated to pull up the entire presser piece 2 and at the same time, the operating piece 15 that has been pressed is released. Then, as shown in FIGS. 5 and 6, the packing 23 is compressed by the enlarged diameter portion 5 a of the packing support piece 5 and the packing presser 12, and the outer peripheral surface thereof is pressed against the branch port 1 a to be closed. .
[0039]
On the other hand, when the operating piece 15 is pushed up to the upper limit position by the urging force of the compression coil spring 17, each locking plate 18 slides against the tension coil spring 20 on the guide surface 15 c of the operating piece 15. The tip is projected from the guide groove 11 of the packing support piece 5.
[0040]
Thereby, even if the extraction force from the branch port 1 a acts on the closing device A, the locking plates 18 are prevented from coming off by engaging with the inner peripheral surface of the water main pipe 1.
[0041]
When the operating piece 15 is pushed up to the upper limit position and both locking plates 18 reach the lower end of the guide surface 15c, the notch groove 21 of the locking plate 18 is automatically engaged with the stopper portion 22 of the operating piece 15. The engaging plate 18 is held in a protruding state by the engagement and by the urging force of the tension coil spring 20 at the time of engagement.
[0042]
After the branch port 1a is closed by the closing device A, if the split T-shaped pipe, the water control valve, the mounting device, and the like are removed, the use state shown in FIGS. 5 and 6 is obtained.
[0043]
If it becomes necessary to remove the closing device A from the branch port 1a, the angular shaft portion 15b of the operating piece 15 is strongly pressed to push the operating piece 15 down to the lower limit position. After releasing the engagement between the stopper portion 22 and the stopper portion 22, the nut 14 may be loosened to release the compressive force of the packing 23.
[0044]
That is, by pressing the operating piece 15, the locking plates 18 are drawn by the tension coil spring 20 until they are positioned at the upper end of the guide surface 15c, and are accommodated in the guide groove 11 as shown in FIG. Since the engagement with the water main pipe 1 is released, the closing device A can be easily removed from the branch port 1a.
[0045]
As described above, in the closing device A of the above embodiment, both the locking plates 18 are advanced and retracted in the direction of the pipe axis by the action of the guide surface 15c of the operating piece 15 which is the advancing / retreating means. Therefore, it is possible to remove the closing device A and reuse it, or to perform maintenance and inspection of the packing 23 and the like.
[0046]
Further, since the two locking plates 18 are linked to each other by the tension coil spring 20, even when the closing device A is attached to the branch port formed in the side wall of the water main pipe 1, the locking plate 18 is The disadvantage of protruding from the guide groove 11 due to its own weight is eliminated.
[0047]
The present invention is not limited to the above embodiments.
[0048]
In the above embodiment, the operating piece 15 and the locking plate 18 are metal contact surfaces. For example, as shown in FIG. 7, the guide surface 15c of the operating piece 15 and the surface of the stopper portion 22 are made of polyacetal or polyamide. It is possible to coat or mold with a synthetic resin material 24 such as resin or ultra high molecular weight polyethylene having a low friction coefficient (the right side is not shown) to reduce the frictional resistance of the contact surface with the locking plate 18. Good.
[0049]
In this way, the forward and backward movement of both locking plates 18 becomes smooth, so that the spring constants of the compression coil spring 17 and the tension coil spring 20 that urge the operating piece 15 upward can be reduced. As a result, the operating force of the operating piece 15 can be reduced.
[0050]
The synthetic resin material 24 as described above may be provided also on the inclined surface 18a of the locking plate 18, and in this way, the forward and backward movement of the locking plate 18 becomes smoother.
[0051]
FIG. 8 shows a modification of the locking plate and the operating piece.
[0052]
In this example, the operating piece 25 has a conical shape having a stopper portion 25a at the lower end, and a male screw rod 26 is continuously provided at the top thereof, and the male screw rod 26 is formed in the shaft hole 8 in the piece main body 3. It is configured to be able to move up and down by screw feeding by inserting and rotating an operating rod into a square hole 27 formed in the upper end portion of the male screw rod 26.
[0053]
On the other hand, the base end portions of both locking plates 28 are formed in an arc shape, and an inclined surface 28 a formed on the lower surface thereof is brought into contact with the tapered guide surface 25 b of the operating piece 25. Both locking plates 28 are connected to each other by a pair of tension coil springs 29 as in the above embodiment.
[0054]
For example, when the operating piece 25 is rotated counterclockwise and pulled upward, the both locking plates 28 are moved to the lower end along the guide surface 25b as described above, thereby protruding from the guide groove 11 of the packing support piece 5. To do. In this state, the notch groove 28b of the locking plate 28 engages with the stopper portion 25a and is held in a protruding state.
[0055]
When the operating piece 25 is rotated to the right and moved to the lower limit position, the both locking plates 28 are displaced above the guide surface 25b and pulled inward by the urging force of the tension coil spring 29. It is accommodated in the guide groove 11.
[0056]
Also in this modification, the synthetic resin material 24 as described above may be coated on one or both of the sliding surfaces of the operating piece 25 and the locking plate 28.
[0057]
In this modification, the notch groove 28b of the locking plate 28 and the stopper portion 25a of the operating piece 25 can be omitted if a detent means for the operating piece 25 is provided.
[0058]
Even when the above-described triangular plate-shaped operating piece 15 is used, if the constant of the compression coil spring 17 is sufficiently large to overcome the tension force of the tension coil spring 20, the notch groove 21 and the operation of the locking plate 18 can be operated. The stopper portion 22 of the piece 15 can be omitted.
[0059]
In the first embodiment, the operating pieces 15 and 25 are moved from below to above, but can be moved from above to below as shown in the conventional example of FIG.
[0060]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0061]
According to the first aspect of the present invention, when the operating piece is moved in the axial direction of the angular shaft portion, both the locking members are moved forward and backward in the tube axis direction, and are engaged with and disengaged from the fluid pipe. Can be reused and maintenance inspection becomes easy. Further, since the locking members are linked to each other by the pulling means, there is no possibility that the locking members protrude from the holding piece. Further, the locking member can be moved back and forth simply by pressing the operating piece from the outside. Further, when the operating piece is moved to the outermost side, the locking member can be locked and held in a protruding state, so that there is no possibility that the engagement between the locking member and the fluid pipe is released due to vibration or fluid pressure. .
[0062]
According to the second aspect of the present invention, when the operating piece is moved in the axial direction of the screw rod, both the locking members are moved forward and backward in the tube axial direction, and are engaged with and disengaged from the fluid pipe. Easy to reuse and maintain. Further, since the locking members are linked to each other by the pulling means, there is no possibility that the locking members protrude from the holding piece. Further, since the operating piece moves while rotating, the advancing and retreating movement of the locking member becomes smooth. Further, when the operating piece is moved to the outermost side, the locking member can be locked and held in a protruding state, so that there is no possibility that the engagement between the locking member and the fluid pipe is released due to vibration or fluid pressure. .
[0065]
According to the invention of claim 3 , since the frictional resistance between the locking member and the guide surface of the operating piece is reduced, the locking member advances and retracts and the moving of the operating piece becomes smooth, and the spring force of the tension means and the operating piece Since the operation force is small, workability is improved.
[0066]
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional front view showing a state before a branch port is closed and a locking plate is projected in an embodiment of the present invention.
FIG. 2 is a side view of the same longitudinal center.
FIG. 3 is an enlarged side view showing a linked state of the locking plate and the operating piece.
FIG. 4 is also a partially cutaway plan view.
FIG. 5 is a central longitudinal sectional front view showing a state where a branch port is closed and a locking plate is protruded.
FIG. 6 is a side view of the same longitudinal center.
FIG. 7 is an enlarged cross-sectional view of a main part showing an example in which a guide surface of an operating piece is covered with a synthetic resin material.
FIG. 8 is a perspective view showing a modification of the operating piece.
FIG. 9 is a central longitudinal side view of a conventional occlusion device.
[Explanation of symbols]
1 Water main (fluid pipe)
DESCRIPTION OF SYMBOLS 1a Branch port 2 Holding piece 3 Piece body 3a Operation shaft 4 Bolt 5 Packing support piece 6 Small diameter male screw 7 Large diameter male screw 8 Shaft hole 9 Tapered hole 10 Bottomed hole 11 Guide groove 12 Packing presser 13 Through hole 14 Nut 15 Actuating piece ( Advancement and retreat means)
15a Slide plate 15b Square shaft portion 15c Guide surface (sliding contact surface )
16 Bottomed hole 17 Compression coil spring 18 Locking plate (locking member)
18a Inclined surface (base end surface)
19 Locking groove 20 Tension coil spring (Tensioning means)
21 Notch groove 22 Stopper portion 23 Packing 24 Synthetic resin material 25 Operating piece 25a Stopper portion 25b Guide surface (sliding contact surface )
26 Male screw rod 27 Square hole 28 Locking plate (locking member)
28a Inclined surface (base end surface)
28b notch groove 29 tension coil spring (tensioning means)

Claims

A presser piece that can be inserted into the branch port formed in the fluid pipe, a packing that is fitted to the outer peripheral surface of the presser piece, and whose inner end surface is in contact with the enlarged diameter portion at the front end of the presser piece, and the presser piece A packing presser that is provided so as to be relatively movable by the moving means, and that presses the outer end face of the packing to elastically deform it in the radial direction, thereby pressing the outer peripheral surface of the packing into the branch port; and the presser piece A branch port provided with at least one pair of locking members which are provided so as to be movable in the pipe axis direction and whose front end protrudes from the presser piece and can be engaged with the inner peripheral surface of the fluid pipe. In the device
In the presser piece, an operation piece having a substantially triangular plate shape in a side view is accommodated, and a guide surface inclined in a divergent shape is formed on the outer peripheral surface of the operation piece, and a corner provided continuously at the top portion thereof. The shaft portion is penetrated so as not to rotate relative to the rectangular shaft hole of the presser piece, and the operating piece is urged toward the outside of the fluid pipe by a compression coil spring accommodated in the presser piece, The operating piece is configured to be movable in the axial direction of the angular axis part by operating the angular axis part from the outside of the presser piece,
The at least one pair of locking members are urged and linked in a direction approaching each other by a pulling means, and the base end surface of the locking member is slidably abutted on the guide surface of the operating piece. Has been
A notch groove is formed at the base end portion of the locking member, and a stopper portion is formed at the distal end portion of the guide surface of the operation piece. The notch groove and the stopper portion are engaged when the operation piece moves to the outermost side. And the closing device of the branch port characterized by hold | maintaining a locking member in the protrusion state .

A presser piece that can be inserted into the branch port formed in the fluid pipe, a packing that is fitted to the outer peripheral surface of the presser piece, and whose inner end surface is in contact with the enlarged diameter portion at the front end of the presser piece, and the presser piece A packing presser that is provided so as to be relatively movable by the moving means, and that presses the outer end face of the packing to elastically deform it in the radial direction, thereby pressing the outer peripheral surface of the packing into the branch port; and the presser piece A branch port provided with at least one pair of locking members which are provided so as to be movable in the pipe axis direction and whose front end part protrudes from the presser piece and which can be engaged with the inner peripheral surface of the fluid pipe. In the device
In the presser piece, a cone-shaped operating piece is accommodated, and the operating piece is formed with a guide surface inclined in a divergent shape on the outer peripheral surface thereof, and a screw rod connected to the top thereof is provided. It is screwed so as to be rotatable relative to the presser piece, and the operating piece is configured to be movable in the axial direction of the screw 杆 by operating the screw 該 from the outside of the presser piece.
The at least one pair of locking members are urged and linked in a direction approaching each other by a pulling means, and the base end surface of the locking member is slidably abutted on the guide surface of the operating piece. Has been
A notch groove is formed at the base end portion of the locking member, and a stopper portion is formed at the distal end portion of the guide surface of the operating piece, and the notch groove and the stopper portion are engaged when the operating piece moves to the outermost side. And the closing device of the branch port characterized by hold | maintaining a locking member in the protrusion state.

3. The branch port closing device according to claim 1, wherein at least one of the sliding surfaces of the locking member and the guide surface of the operating piece is covered with a material that is hard and has a small friction coefficient.