JP4067829B2

JP4067829B2 - Pipe fitting

Info

Publication number: JP4067829B2
Application number: JP2002013554A
Authority: JP
Inventors: 喜康川上; 幸夫滑川
Original assignee: Nitto Kohki Co Ltd
Current assignee: Nitto Kohki Co Ltd
Priority date: 2002-01-22
Filing date: 2002-01-22
Publication date: 2008-03-26
Anticipated expiration: 2022-01-22
Also published as: JP2003214584A

Description

【０００１】
【発明の属する技術分野】
本発明は、先端部が拡径段部を経て拡径先端部となっているパイプの前記拡径段部の外周をロック用コイルスプリング環で押さえて接続する管継手に関するものである。
【０００２】
【従来の技術】
従来、この種の管継手として、基準径のパイプ本体部の先端部が拡径段部を経て拡径先端部となっているパイプの前記拡径段部の外周をロック用コイルスプリング環で押さえて接続する管継手が提案されている。
【０００３】
従来の管継手では、ロック用コイルスプリング環を縮径・拡径するために、内周に縮径テーパ孔部を有する外筒体を継手本体の先端外周に設けていて、この外筒体をカム機構で継手本体の軸心方向に前後に移動させ、この外筒体を継手本体の基端側に移動させた際にはその縮径テーパ孔部の小径側でロック用コイルスプリング環を求心方向に押圧し縮径させてパイプを固定し、また継手本体の先端側に移動させた際にはその縮径テーパ孔部の大径側で前記求心方向への押圧を解除してロック用コイルスプリング環を復元力により拡径させてパイプの固定を解除していた。
【０００４】
【発明が解決しようとする課題】
しかしながら、従来のこのような管継手では、縮径テーパ孔部を有する部材をカム機構で継手本体の軸心方向に前後に移動させていたので、該縮径テーパ孔部を有する部材を継手本体の軸心方向に移動させる手段の構造が複雑化し、コスト高になる問題点があった。
【０００５】
本発明の目的は、縮径テーパ孔部を有する部材を、継手本体の軸心方向に前後に移動させる手段の構造の簡略化を図ることができる管継手を提供することにある。
【０００６】
【課題を解決するための手段】
本発明は、先端部が拡径段部を経て拡径先端部となっているパイプの前記拡径段部の外周をロック用コイルスプリング環で押さえて接続する管継手を改良するものである。
【０００７】
請求項１に記載の管継手は、前記パイプの拡径先端部を挿入できる内径の挿入孔部を有する筒状の継手本体と、前記挿入孔部内に気密液密に嵌合され前記パイプの拡径先端部の先端又は内面に気密液密に接触するパッキングと、前記継手本体のパイプ挿入側に配置されていて先端に向かって縮径される縮径テーパ孔部と該縮径テーパ孔部の先端側に存在して前記パイプの拡径先端部を挿入できる内径の小径孔部を有する可動前筒体と、前記継手本体のパイプ挿入側端部と可動前筒体の後端に開口する縮径テーパ孔部がなす空間に配置され該縮径テーパ孔部内で縮径して前記継手本体の挿入孔部内に挿入された前記パイプの拡径段部を押さえる前記ロック用コイルスプリング環と、前記可動前筒体の外周と前記継手本体の外周に跨がって、可動前筒体とは回転自在で軸方向には一体となるように、継手本体とは回転自在で軸方向に移動自在となるように嵌合しており、前記継手本体の基端側に移動した際には前記可動前筒体を同方向に移動して縮径テーパ孔部の小径側で前記ロック用コイルスプリング環を縮径させ、前記継手本体のパイプ挿入側に移動した際には前記可動前筒体を同方向に移動して縮径テーパ孔部の大径側で前記ロック用コイルスプリング環の押圧を解除して拡径させる操作を行う操作スリーブと、前記継手本体と前記操作スリーブのいずれか一方に前記継手本体の軸方向に対して傾斜した状態に設けられたガイド溝と、前記継手本体と前記操作スリーブのいずれか他方に支持されていて前記ガイド溝に係合したガイドピンとを備えていることを特徴とする。
【０００８】
かかる構成から、カム機構を用いずに、単に操作スリーブを正逆いずれかの方向に回すことによりガイド溝とガイドピンとで操作スリーブが軸方向に前後動し、この操作スリーブの前後動により前記可動前筒体を前後動させることができるので、構造を簡略化することができ、コストを低減することができる。
【０００９】
請求項２に記載の管継手は、請求項１に記載の構成で、前記可動前筒体の外周には、前記操作スリーブの内周面に当接し操作スリーブを支持するボールが円周方向に複数自転できるように設けられていることを特徴とする。
【００１０】
かかる構成から、操作スリーブを回転させることにより操作スリーブに軸方向への動きを発生させたとき、操作スリーブに嵌合している可動前筒体は、その外周に設けられているボールが自転して操作スリーブの回転が伝わらない状態で軸方向への移動のみが伝達されることから、可動前筒体は回転の無い状態で移動して縮径テーパ孔部でロック用コイルスプリング環を押圧し、また押圧を解除することになるので、ロック用コイルスプリング環の拡径、縮径を円滑に且つ確実に行うことができる。
【００１１】
請求項３に記載の管継手は、請求項１又は２に記載の構成で、前記ガイド溝には、前記縮径テーパ孔部の小径側で前記ロック用コイルスプリング環を縮径させている状態で前記ガイドピンを係合させることにより、継手本体の基端側に移動している前記操作スリーブがパイプ挿入側に戻らないようにその回転を阻止するロック溝部が設けられていることを特徴とする。
【００１２】
かかる構成から、操作スリーブは、縮径テーパ孔部の小径側でロック用コイルスプリング環を縮径させている状態で、ロックピンがロック溝部に入ることによりその回転が阻止されるので、パイプの接続をより確かなものにできる。
【００１３】
請求項４に記載の管継手は、請求項１，２又は３に記載の構成で、前記ガイド溝が前記操作スリーブに設けられているとき、前記継手本体には外周に開口させて穴が設けられ、該穴内にはロックボールがスプリングで前記継手本体の外周から突出する方向に付勢されて挿入されており、該ロックボールは、操作スリーブが前記継手本体のパイプ挿入側に移動して前記可動前筒体の縮径テーパ孔部の大径側で前記ロック用コイルスプリング環が拡径している状態では操作スリーブの内周面で求心方向に押さえられて前記穴内に没入しており、操作スリーブが前記継手本体の基端側に移動して前記可動前筒体の縮径テーパ孔部の小径側で前記ロック用コイルスプリング環を縮径させている状態のときスプリングの付勢により前記操作スリーブに設けられたガイド溝に係合して操作スリーブがパイプ挿入側に戻らないようにその回転を阻止するようになっていることを特徴とする。
【００１４】
かかる構成から、縮径テーパ孔部の小径側でロック用コイルスプリング環を縮径させている状態で、操作スリーブに設けられているガイド溝にロックボールが係合して操作スリーブの回転が阻止されるので、パイプの接続をより確かなものにできる。
【００１５】
請求項５に記載の管継手は、請求項１，２，３又は４に記載の構成で、前記継手本体の挿入孔部内に嵌合される前記パッキングは、継手本体のパイプ挿入側から着脱可能に挿入されるようになっていることを特徴とする。
【００１６】
かかる構成から、パッキングの劣化や破損があったときの交換作業を容易に行うことができる。
【００１７】
請求項６に記載の管継手は、請求項１，２，３，４又は５に記載の構成で、前記パッキングは、前記継手本体の挿入孔部内に気密液密に嵌合される大径部と、該大径部に一体に形成され前記パイプの拡径先端部の内面に気密液密に接触する小径部からなり、前記小径部は前記パイプの開口部を塞ぐ構造であることを特徴とする。
【００１８】
かかる構成から、パッキングが継手本体の挿入孔部に挿入されたパイプの開口部を塞ぐので、この管継手をパイプの栓として使用することができる。
【００１９】
請求項７に記載の管継手は、請求項１，２，３，４又は５に記載の構成で、前記パッキングは、前記継手本体の挿入孔部内に気密液密に嵌合される大径部と、該大径部に一体に形成され前記パイプの拡径先端部の内面に気密液密に接触する小径部からなる筒状構造であることを特徴とする。
【００２０】
かかる構成から、継手本体内と、該継手本体の挿入孔部に挿入されたパイプ内を連通状態で接続することができる。
【００２１】
請求項８に記載の管継手は、請求項１，２，３，４，５，６又は７に記載の構成で、前記パッキングは、パイプの拡径先端部の先端内部または外部に装着される装着部を一体に有し、予めパイプの拡径先端部の先端に装着された状態でパイプの拡径先端部とともに前記継手本体の挿入孔部に挿入されるものであることを特徴とする。
【００２２】
かかる構成から、パイプの接続時に、パイプの拡径先端部にパッキングを装着して接続するので、接続の都度、常にパッキングの状態を確認できるので、接続時のシールの完全性を確実に図ることができる。
【００２３】
請求項９に記載の管継手は、請求項８に記載の構成で、前記パッキングに有する装着部は、請求項６又は７に記載の小径部からなることを特徴とする。
【００２４】
かかる構成から、請求項６又は７に記載の小径部を装着部とすることにより、新たにパッキングに装着部を設ける必要が無い。特に、請求項６に記載の小径部はパイプの開口部を塞ぐ構造であるので、該小径部を有するパッキングを予めパイプの拡径先端部に装着しておくことにより、パイプ内に埃等が入ることを防止する蓋としての役割も果たすことができる。
【００２５】
請求項１０に記載の管継手は、請求項５，６，７，８又は９に記載の構成で、前記継手本体の前記挿入孔部と連通する後部孔部内には、軸方向に移動可能に嵌合され、前記パッキングの前記継手本体の軸方向の位置を調整するパッキン押えを備えていることを特徴とする。
【００２６】
かかる構成から、パイプの拡径先端部の長さにばらつきがあっても、パッキン押えの位置を軸方向に移動調整することにより、前記継手本体の挿入孔部内におけるパッキングの位置をパイプの拡径先端部の長さに応じて調整することができる。
【００２７】
請求項１１に記載の管継手は、請求項１，２，３，４，５，６，７，８又は９に記載の構成で、前記継手本体の外周には前記操作スリーブがパイプ挿入側に位置しているとき露出して該操作スリーブが非ロック状態にあることを示すロック表示部が設けられていることを特徴とする。
【００２８】
かかる構成から、このロック表示部が露出しているか否かを確認することにより、操作スリーブがロック状態にあるか否かを容易に知ることができる。
【００２９】
【発明の実施の形態】
図１乃至図６は本発明に係る管継手の実施の形態の一例を示したもので、図１は本例の管継手にパイプを接続する前の状態の示す縦断側面図、図２は図１のＡ−Ａ線断面図、図３は図１に示す操作スリーブに設けられているガイド溝の展開図、図４は図１で用いているロック用コイルスプリングの拡大正面図、図５は本例の管継手にパイプを接続した状態を示す縦断側面図、図６は図５のＢ−Ｂ線断面図である。
【００３０】
本例の管継手は、基準径のパイプ本体部１ａの先端部がテーパ形の拡径段部１ｂを経て拡径先端部１ｃとなっているパイプ１を接続するためのものである。
【００３１】
この管継手は、パイプ１の拡径先端部１ｃを挿入できる内径の挿入孔部２ａと該挿入孔部２ａより小径の後部孔部２ｂとを有する金属製の継手本体２を有する。この継手本体２内には、ゴム製のパッキング３が嵌められている。このパッキング３は、本例では、継手本体２の挿入孔部２ａの内周に外周が気密液密に接触した状態で該継手本体２の軸心方向に摺動可能な大径部３ａと、該大径部３ａに一体に形成され前記パイプ１の拡径先端部１ｃ内に装着され拡径先端部１ｃの内面に気密液密に接触する装着部となる小径部３ｂとで構成されている。本例では、前記小径部３ｂは開口されておらず、継手本体２の挿入孔部２ａに挿入されたパイプ１の拡径先端部１ｃの開口部を塞ぐ構造になっている。また、前記のように構成されたパッキング３は、本例では、継手本体２のパイプ挿入側から着脱可能に挿入孔部２ａに挿入されるようになっている。
【００３２】
前記継手本体２のパイプ挿入側には、可動前筒体４が配置されている。この可動前筒体４は金属製であって、先端に向かって縮径される縮径テーパ孔部４ａと該縮径テーパ孔部４ａの先端側に存在して拡径先端部１ｃを挿入できる内径の小径孔部４ｂと、該小径孔部４ｂより先端に向かってテーパ状に拡径され前記パイプ１の拡径先端部１ｃの挿入を容易にするガイド部４ｃとを有する構造になっている。また、この可動前筒体４は、先端外周が小径部４ｄで、その後部が大径部４ｅとなっている。
【００３３】
前記継手本体２のパイプ挿入側端部と可動前筒体４の後端に開口する縮径テーパ孔部４ａとがなす空間には、ロック用コイルスプリング環５が配置されている。このロック用コイルスプリング環５内には、コイルの変形を防止する複数のボールが入っている。また、ロック用コイルスプリング環５は、通常は前記継手本体２の挿入孔部２ａより大きな内径となっており、縮径されたとき、前記挿入孔部２ａより小さな内径となって、挿入孔部２ａに挿入されたパイプ１の拡径先端部１ｃの拡径段部１ｂに係止して押さえるようになっている。
【００３４】
前記可動前筒体４の外周と継手本体２のパイプ挿入側外周には操作スリーブ６が、可動前筒体４とは回転自在で軸方向には一体となるように、そして継手本体２とは回転自在で軸方向に移動自在となるように嵌合しており、前記操作スリーブ６が継手本体２の基端側に移動した際には可動前筒体４を同方向に移動して縮径テーパ孔部４ａの小径側で前記ロック用コイルスプリング環５を縮径させ、前記継手本体２のパイプ挿入側に移動した際には前記可動前筒体４を同方向に移動して縮径テーパ孔部４ａの大径側で前記ロック用コイルスプリング環５の押圧を解除して拡径させるようになっている。
【００３５】
更に詳細には、前記操作スリーブ６と可動前筒体４とにあっては、操作スリーブ６は先端に内鍔部６ａを有し、この内鍔部６ａ内に可動前筒体４の小径部４ｄの外周に前記内鍔部６ａを嵌合し、該内鍔部６ａを小径部４ｄと大径部４ｅとの間に設けたボール７と小径部４ｄの外周に設けたストップリング８とで挟むようにして支持し、操作スリーブ６と可動前筒体４が軸方向に一体となって移動できるようになっている。そして、前記小径部４ｄと大径部４ｅとの間に設けたボール７は可動前筒体４の円周方向に複数自転できるように設けられ、前記操作スリーブ６の内周面及び内鍔部６ａの内側に当接して操作スリーブ６を支持しており、操作スリーブ６の回転が前記ボール７により可動前筒体４に伝達されないよういになっている。
【００３６】
また、前記操作スリーブ６と継手本体２にあっては、操作スリーブ６に、継手本体２の軸心方向に対して傾斜した状態でガイド溝９が設けられ、継手本体２には、前記ガイド溝９に係合するガイドピン１０が螺着されており、操作スリーブ６を正逆回転させると、操作スリーブ６はガイド溝９に係合しているガイドピン１０により、軸方向に移動するようになっている。
【００３７】
この操作スリーブ６の軸方向への移動距離は、前記ガイド溝９の一端部から他端部までの軸心長さに規制され、そして、操作スリーブ６が継手本体２のパイプ挿入側に移動して前記ガイドピン１０がガイド溝９の後端側（図１上左側）に位置したとき、操作スリーブ７とともに移動する可動前筒体４の縮径テーパ孔部４ａによる前記ロック用コイルスプリング環５の押圧が解除された状態にあり（図１参照）、操作スリーブ６が継手本体２の基端側に移動して前記ガイドピン１０がガイド溝９の前端側（図１上右側）に位置したとき、操作スリーブ６とともに移動する可動前筒体４の縮径テーパ孔部４ａの小径側で前記ロック用コイルスプリング環５を縮径させる状態になるように設定されている。
【００３８】
更に、前記ガイド溝９の前端側には、該前端側の位置に係合しているガイドピン１０を係合させることにより、縮径テーパ孔部４ａの小径側でロック用コイルスプリング環５を縮径させている状態での操作スリーブ６が継手本体２のパイプ挿入側に戻らないようにその回転を阻止するロック溝部９ａが設けられている。
【００３９】
また、前記継手本体２には外周に開口させて穴１１が設けられ、該穴１１内には前記ガイド溝９の溝幅より大きい直径を有するロックボール１２がスプリング１３で前記継手本体２の外周から突出する方向に付勢されて挿入されている。該ロックボール１２は、操作スリーブ６が前記継手本体２のパイプ挿入側に移動して前記可動前筒体４の縮径テーパ孔部４ａの大径側で前記ロック用コイルスプリング環５が拡径している状態では操作スリーブ６の内周面で求心方向に押さえられて前記穴１１内に没入しており、操作スリーブ６が前記継手本体２の基端側に移動して前記可動前筒体４の縮径テーパ孔部４ａの小径側で前記ロック用コイルスプリング環５を縮径させている状態のときスプリング１３の付勢により前記操作スリーブ６に設けられたガイド溝９の後端側にその一部が係合して操作スリーブ６が先端側に戻らないようにその回転を阻止するようになっている。
【００４０】
前記継手本体２の外周には前記操作スリーブ６が前進位置にあるとき露出して該操作スリーブ６が非ロック状態にあることを示すロック表示部１４が設けられており、このロック表示部１４が露出しているか否かを確認することにより、操作スリーブ６がロック状態にあるか否かを知ることができるようになっている。
【００４１】
前記継手本体２の前記挿入孔部２ａと連通する後部孔部２ｂ内には、軸方向に螺合され、前記継手本体２のパイプ挿入側から挿入され挿入孔部２ａ内に軸方向に摺動可能に嵌合したパッキング３に当接して、パッキング３の前記継手本体２の軸方向の位置を調整するパッキン押え１５を備えており、パイプ１の拡径先端部１ｃの長さにばらつきがあっても、パッキン押え１５の位置を軸方向に移動調整することにより、前記継手本体２の挿入孔部２ａ内におけるパッキング３の位置をパイプ１の拡径先端部１ｃの長さに応じて調整することができるようになっている。そして、このパッキン押え１５は、継手本体２に螺合されているネジよりなるパッキン押え位置固定具１６により継手本体２に対するその位置を固定されるようになっている。
【００４２】
次に、このように構成された管継手にパイプ１を接続する操作について説明する。この管継手に対するパイプ１の接続前は、図１及び図２に示すようになっている。この状態では、操作スリーブ６は前進位置にあり、ロック用コイルスプリング環５が縮径テーパ孔部４ａの大径側にあって縮径されていない状態になっている。また、この状態では、ロック表示部１４が露出されていて、操作スリーブ６が非ロック状態にあることを示している。
【００４３】
かかる状態で、パイプ１の拡径先端部１ｃを可動前筒体４の小径孔部４ｂを経て継手本体２の挿入孔部２ａに挿入する。これにより、パッキング３はパイプ１の拡径先端部１ｃの先端で押されて移動しパッキン押え１５に当接してそれ以上の移動が阻止され、継手本体２の挿入孔部２ａ内におけるパッキング３の位置が固定される。更に、パイプ１の拡径先端部１ｃの挿入を続けるとパッキング３の小径部３ｂがパイプ１の拡径先端部１ｃ内に圧入して拡径先端部１ｃの内面に気密液密に接触する。
【００４４】
次いで、操作スリーブ６を周方向に回すと、該操作スリーブ６に継手本体２の軸心方向に対して傾斜した状態で設けられているガイド溝９と、継手本体２に突設されていて該ガイド溝９に嵌まっているガイドピン１０との作用で、該操作スリーブ６が継手本体２の基端側に移動し、この操作スリーブ６の移動と一緒に可動前筒体４も移動し、これにより可動前筒体４の縮径テーパ孔部４ａも移動して、図５及び図６に示すように縮径テーパ孔部４ａの小径側でロック用コイルスプリング環５が求心方向に押圧されて縮径し、パイプ１の拡径段部１ｂの外周部に係止してこれをロックし、これによりパイプ１が接続される。
【００４５】
このとき、前記可動前筒体４の外周には、前記操作スリーブ６の内周面に当接し操作スリーブ６を支持するボール７が円周方向に複数自転するように設けられているので、可動前筒体４には操作スリーブ６の回転は伝わらず軸方向への移動のみが伝達されることから、可動前筒体４は回転の無い状態で移動して縮径テーパ孔部４ａでロック用コイルスプリング環５を押圧することになるので、ロック用コイルスプリング環５の縮径を円滑に且つ確実に行うことができる。
【００４６】
そして、前記継手本体２の基端側に移動している前記操作スリーブ６は、縮径テーパ孔部４ａの小径側でロック用コイルスプリング環５を縮径させている状態で、ロックピン１０がロック溝部９ａに入ることによりその回転が阻止され、更に又、継手本体２の外周に開口する穴１１内に挿入されているロックボール１２がスプリング１３で付勢されて操作スリーブ６に設けられているガイド溝９に係合することにより操作スリーブ６の回転が阻止されるので、パイプ１の接続がより確かなものとなる。
【００４７】
また、パイプ１を分離するときは、前記操作スリーブ６を回転させて継手本体２のパイプ挿入側に移動させる。これにより、可動前筒体４を同方向に移動して縮径テーパ孔部４ａが前記ロック用コイルスプリング環５から離反し、縮径テーパ孔部４ａによる押圧から解放された前記ロック用コイルスプリング環５は縮径テーパ孔部４ａの大径側で復元力により拡径し、パイプ１の抜き取りを可能にし、継手本体２からパイプ１を引き抜くことにより、容易に分離することができる。
【００４８】
前記操作スリーブ６の回転操作の際、操作スリーブ６に設けたガイド溝９のロック溝部９ａにガイドピン１０が係合し、そして、同じくガイド溝９に継手本体２の穴１１内に挿入されているロックボール１２が係止して操作スリーブ６の回転が阻止されているが、前記操作スリーブ６を継手本体２の基端側に少し後退移動させることによりガイドピン１０をロック溝部９ａから容易にはずすことができ、そして、操作スリーブ６を強く回すと、ガイド溝９に係止していたロックボール１２が穴１１内に押し込められるので、操作スリーブ６を回転させることができる。
【００４９】
なお、上記例では、ガイド溝９を操作スリーブ６に設け、ガイドピン１０を継手本体２に設けているが、ガイド溝９を継手本体２に設け、ガイドピン１０を操作スリーブ６に設けてもよい。
【００５０】
また、上記例では、前記パッキング３は、前記継手本体２の挿入孔部２ａ内に気密液密に嵌合されている大径部３ａと、該大径部３ａに一体に形成され前記パイプ１の拡径先端部１ｃ内に装着され拡径先端部１ｃの内面に気密液密に接触する装着部となる小径部３ｂとで構成され、前記小径部３ｂは前記パイプ１の拡径先端部１ｃの開口部を塞ぐ構造とし、この管継手をパイプ１の栓として使用する例を示しているが、前記パッキング３を、前記継手本体２の挿入孔部２ａ内に気密液密に嵌合されている大径部３ａと、該大径部３ａに一体に形成され前記パイプ１の拡径先端部１ｃ内に装着され拡径先端部１ｃの内面に気密液密に接触する装着部となる小径部３ｂからなる筒状構造とすることにより、継手本体２内と、該継手本体２の挿入孔部２ａに挿入されたパイプ１内を連通状態で接続する管継手として使用することもできる。
【００５１】
また、上記例では、前記パッキング３を前記継手本体２の挿入孔部２ａ内に気密液密に嵌合した状態から、パイプ１を継手本体２の挿入孔部２ａに挿入しているが、前記パッキング３の装着部となる小径部３ｂを予めパイプ１の拡径先端部１ｃに圧入してパッキング３をパイプ１に装着しておき、パッキング３をパイプ１の拡径先端部１ｃとともに継手本体２の挿入孔部２ａに挿入してもよい。このとき、小径部３ｂがパイプ１の開口部を塞ぐ構造であると、パイプ１内に埃等が入ることを防止する蓋としての役割も果たすことができるものとなる。
【００５２】
また、上記例では、パッキング３は継手本体２のパイプ挿入側から着脱可能に挿入孔部２ａに挿入されるようになっているが、必ずしも着脱可能である必要はない。また、パッキング３はパイプ１の拡径先端部１ｃの内面に気密液密に接触するようになっているが、パイプ１の拡径先端部１ｃの端面に気密液密に接触するようになっていてもよい。
【００５３】
【発明の効果】
以上のように本発明に係る管継手によれば、カム機構を用いずに、単に操作スリーブを正逆いずれかの方向に回すことによりガイド溝とガイドピンとで可動前筒体を前後に操作するので、構造を簡略化することができ、コストを低減することができる。
【図面の簡単な説明】
【図１】本発明に係る管継手の実施の形態の一例で、この管継手にパイプを接続する前の状態の示す縦断側面図である。
【図２】図１のＡ−Ａ線断面図である。
【図３】図１に示す操作スリーブに設けられているガイド溝の展開図である。
【図４】図１で用いているロック用コイルスプリングの拡大正面図である。
【図５】本例の管継手にパイプを接続した状態を示す縦断側面図である。
【図６】図５のＢ−Ｂ線断面図である。
【符号の説明】
１パイプ
１ａパイプ本体部
１ｂ拡径段部
１ｃ拡径先端部
２継手本体
２ａ挿入孔部
２ｂ後部孔部
３パッキング
３ａ大径部
３ｂ小径部
４可動前筒体
４ａ縮径テーパ孔部
４ｂ小径孔部
４ｃガイド部
４ｄ小径部
４ｅ大径部
５ロック用コイルスプリング環
６操作スリーブ
６ａ内鍔部
７ボール
８ストップリング
９ガイド溝
９ａロック溝部
１０ガイドピン
１１穴
１２ロックボール
１３スプリング
１４ロック表示部
１５パッキン押え
１６パッキン押え位置固定具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint in which the outer periphery of the diameter-expanded step portion of a pipe whose tip portion becomes a diameter-expanded tip portion through a diameter-expanded step portion is pressed and connected with a coil spring ring for locking.
[0002]
[Prior art]
Conventionally, as a pipe joint of this type, the outer periphery of the diameter-expanded step portion of the pipe in which the tip end portion of the pipe body portion of the reference diameter passes through the diameter-expanded step portion is held by a coil spring ring for locking. Pipe joints have been proposed.
[0003]
In the conventional pipe joint, in order to reduce or increase the diameter of the locking coil spring ring, an outer cylinder body having a reduced diameter taper hole is provided on the inner periphery of the joint body. When the outer cylinder is moved back and forth in the axial direction of the joint body by the cam mechanism, and the outer cylinder is moved to the proximal end side of the joint body, the locking coil spring ring is centered on the smaller diameter side of the reduced diameter tapered hole. When the pipe is fixed by pressing in the direction to reduce the diameter, and when moved to the tip side of the joint body, the locking coil is released by releasing the pressing in the centripetal direction on the large diameter side of the reduced diameter tapered hole portion. The spring ring was expanded by restoring force to release the pipe.
[0004]
[Problems to be solved by the invention]
However, in such a conventional pipe joint, since the member having the reduced diameter tapered hole portion is moved back and forth in the axial direction of the joint body by the cam mechanism, the member having the reduced diameter tapered hole portion is moved to the joint body. There is a problem that the structure of the means for moving in the axial center direction becomes complicated and the cost increases.
[0005]
An object of the present invention is to provide a pipe joint capable of simplifying the structure of means for moving a member having a reduced diameter tapered hole portion back and forth in the axial direction of the joint body.
[0006]
[Means for Solving the Problems]
The present invention improves the pipe joint in which the outer periphery of the expanded diameter step portion of the pipe whose distal end portion passes through the expanded diameter step portion is pressed and connected by a coil spring ring for locking.
[0007]
According to a first aspect of the present invention, there is provided a pipe joint having a cylindrical joint body having an insertion hole portion having an inner diameter into which the diameter-expanded tip portion of the pipe can be inserted, and an airtight and liquid-tight fit in the insertion hole portion. A packing that is in airtight and liquid tight contact with the tip or inner surface of the diameter tip portion, a diameter-reduced taper hole portion that is disposed on the pipe insertion side of the joint body and is reduced in diameter toward the tip, and the diameter-reduced taper hole portion A movable front cylinder having a small-diameter hole having an inner diameter that can be inserted into the diameter-expanded tip of the pipe, and a contraction opening at a pipe insertion side end of the joint body and a rear end of the movable front cylinder. A coil spring ring for locking that is disposed in a space formed by a diameter taper hole portion, reduces the diameter in the diameter reduction taper hole portion, and presses the diameter-expanded step portion of the pipe inserted into the insertion hole portion of the joint body; It is movable across the outer periphery of the movable front cylinder and the outer periphery of the joint body. When it moves to the base end side of the joint body, it is fitted so that it is rotatable and unitary in the axial direction with the cylinder body, and is rotatably and axially movable with the joint body. The movable front cylinder is moved in the same direction to reduce the diameter of the locking coil spring ring on the small diameter side of the reduced diameter tapered hole, and when the cylinder body is moved to the pipe insertion side of the joint body, An operation sleeve that moves the cylinder in the same direction and releases the pressure of the locking coil spring ring on the large diameter side of the diameter-reduced taper hole to expand the diameter, and any of the joint body and the operation sleeve A guide groove provided in an inclined state with respect to the axial direction of the joint body; and a guide pin supported by the other of the joint body and the operation sleeve and engaged with the guide groove. It is characterized by.
[0008]
With such a configuration, the operating sleeve is moved back and forth in the axial direction by the guide groove and the guide pin by simply rotating the operating sleeve in either the forward or reverse direction without using the cam mechanism, and the movable sleeve is moved by the back and forth movement of the operating sleeve. Since the front cylinder can be moved back and forth, the structure can be simplified and the cost can be reduced.
[0009]
According to a second aspect of the present invention, in the pipe joint according to the first aspect, a ball that contacts the inner peripheral surface of the operation sleeve and supports the operation sleeve is provided in a circumferential direction on the outer periphery of the movable front cylinder. It is provided so that two or more rotation is possible.
[0010]
With this configuration, when the operating sleeve is caused to move in the axial direction by rotating the operating sleeve, the movable front cylinder fitted to the operating sleeve rotates the ball provided on the outer periphery thereof. Therefore, only the movement in the axial direction is transmitted without the rotation of the operation sleeve being transmitted, so the movable front cylinder moves without rotation and presses the locking coil spring ring with the reduced diameter tapered hole. Moreover, since the pressing is released, the diameter of the locking coil spring ring can be smoothly and reliably reduced.
[0011]
According to a third aspect of the present invention, there is provided the pipe joint according to the first or second aspect, wherein the guide coil groove has the diameter of the coil spring ring for locking reduced on the small diameter side of the diameter-reduced tapered hole portion. A locking groove portion is provided to prevent the operation sleeve moving to the proximal end side of the joint main body from being returned to the pipe insertion side by engaging the guide pin. To do.
[0012]
With this configuration, the operation sleeve is prevented from rotating when the lock pin enters the lock groove portion in a state where the diameter of the lock coil spring ring is reduced on the small diameter side of the reduced diameter tapered hole portion. The connection can be made more reliable.
[0013]
According to a fourth aspect of the present invention, in the pipe joint according to the first, second, or third aspect, when the guide groove is provided in the operation sleeve, the joint body is provided with a hole that opens to the outer periphery. The lock ball is inserted into the hole by being biased by a spring in a direction protruding from the outer periphery of the joint body, and the operation sleeve moves to the pipe insertion side of the joint body to In a state where the diameter of the locking coil spring ring is enlarged on the large diameter side of the diameter-reduced tapered hole portion of the movable front cylindrical body, it is pressed in the centripetal direction on the inner peripheral surface of the operation sleeve and is immersed in the hole. When the operation sleeve moves to the proximal end side of the joint body and the diameter of the locking coil spring ring is reduced on the small diameter side of the diameter-reduced taper hole portion of the movable front cylinder, the spring is biased. Set on the operation sleeve Engaging operation sleeve was guide grooves, characterized in that is adapted to prevent rotation thereof so as not to return to the pipe insertion side.
[0014]
With this configuration, in a state where the diameter of the locking coil spring ring is reduced on the small diameter side of the reduced diameter tapered hole, the lock ball is engaged with the guide groove provided in the operating sleeve to prevent the operating sleeve from rotating. Therefore, the pipe connection can be made more reliable.
[0015]
The pipe joint according to claim 5 is the structure according to claim 1, 2, 3 or 4, and the packing fitted into the insertion hole of the joint body is detachable from the pipe insertion side of the joint body. It is characterized by being inserted into the.
[0016]
With this configuration, the replacement work can be easily performed when the packing is deteriorated or damaged.
[0017]
The pipe joint according to claim 6 is the structure according to claim 1, 2, 3, 4 or 5, and the packing is a large-diameter portion fitted in an airtight and liquid-tight manner in the insertion hole of the joint body. And a small-diameter portion that is integrally formed with the large-diameter portion and that is in airtight and liquid-tight contact with the inner surface of the enlarged-diameter tip portion of the pipe, and the small-diameter portion has a structure that blocks the opening of the pipe. To do.
[0018]
With this configuration, the packing closes the opening of the pipe inserted into the insertion hole of the joint body, so that the pipe joint can be used as a plug for the pipe.
[0019]
The pipe joint according to claim 7 is the structure according to claim 1, 2, 3, 4 or 5, wherein the packing is a large-diameter portion fitted in an airtight and liquid-tight manner in the insertion hole of the joint body. And a cylindrical structure composed of a small-diameter portion that is integrally formed with the large-diameter portion and that is in airtight and liquid-tight contact with the inner surface of the enlarged-diameter tip portion of the pipe.
[0020]
From this structure, the inside joint body, as possible out to connect a pipe inserted into the insertion hole of該継hand body in a communicated state.
[0021]
Pipe joint according to claim 8, claim 1, 2, 3, 4, 6 or the configuration according to 7, wherein the packing is mounted to the distal end inside or outside of the enlarged diameter distal end portion of the pipe The mounting portion is integrally inserted, and is inserted into the insertion hole portion of the joint body together with the expanded diameter distal end portion of the pipe in a state of being previously mounted at the distal end of the expanded diameter distal end portion of the pipe. .
[0022]
With this configuration, when connecting the pipe, the packing is attached to the tip of the expanded diameter of the pipe and connected so that the packing status can be confirmed at every connection, ensuring the integrity of the seal at the time of connection. Can do.
[0023]
According to a ninth aspect of the present invention, in the pipe joint according to the eighth aspect, the mounting portion included in the packing includes the small diameter portion according to the sixth or seventh aspect.
[0024]
With such a configuration, it is not necessary to newly provide a mounting portion in the packing by using the small diameter portion according to claim 6 or 7 as the mounting portion. In particular, since the small-diameter portion according to claim 6 has a structure that closes the opening of the pipe, by attaching a packing having the small-diameter portion to the enlarged-diameter tip portion of the pipe in advance, dust or the like is generated in the pipe. It can also serve as a lid that prevents entry.
[0025]
The pipe joint according to claim 10 is configured as described in claim 5, 6, 7, 8 or 9, and is movable in the axial direction in a rear hole portion communicating with the insertion hole portion of the joint body. A packing presser that is fitted and adjusts an axial position of the joint body of the packing is provided.
[0026]
From this configuration, even if there is variation in the length of the expanded diameter tip of the pipe, the position of the packing in the insertion hole of the joint body can be adjusted by moving the packing retainer in the axial direction. It can be adjusted according to the length of the tip.
[0027]
Tube fitting of claim 11, claim 1,2,3, 4, 5, 6, 7, 8 or the structure according to 9, wherein the operating sleeve pipe insertion side on the outer periphery of the joint body It is characterized in that a lock display portion is provided which is exposed when it is located at the position and indicates that the operation sleeve is in an unlocked state.
[0028]
With such a configuration, it can be easily known whether or not the operation sleeve is in the locked state by checking whether or not the lock display portion is exposed.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
1 to 6 show an example of an embodiment of a pipe joint according to the present invention. FIG. 1 is a vertical side view showing a state before connecting a pipe to the pipe joint of this example, and FIG. FIG. 3 is a developed view of the guide groove provided in the operation sleeve shown in FIG. 1, FIG. 4 is an enlarged front view of the locking coil spring used in FIG. 1, and FIG. FIG. 6 is a cross-sectional side view taken along the line BB of FIG. 5, showing a state in which a pipe is connected to the pipe joint of this example.
[0030]
The pipe joint of this example is for connecting a pipe 1 in which a tip end portion of a pipe body portion 1a having a reference diameter is a diameter-expanded tip portion 1c through a tapered diameter-expanding step portion 1b.
[0031]
This pipe joint includes a metal joint body 2 having an insertion hole portion 2a having an inner diameter into which the diameter-expanded tip portion 1c of the pipe 1 can be inserted, and a rear hole portion 2b having a smaller diameter than the insertion hole portion 2a. A rubber packing 3 is fitted in the joint body 2. In this example, the packing 3 includes a large-diameter portion 3a that is slidable in the axial direction of the joint body 2 in a state where the outer periphery is in airtight and liquid-tight contact with the inner periphery of the insertion hole 2a of the joint body 2. The large-diameter portion 3a is integrally formed with a small-diameter portion 3b that is mounted in the enlarged-diameter tip portion 1c of the pipe 1 and serves as a mounting portion that comes into airtight and liquid-tight contact with the inner surface of the enlarged-diameter tip portion 1c. . In this example, the small diameter portion 3b is not opened, and the opening portion of the enlarged diameter tip portion 1c of the pipe 1 inserted into the insertion hole portion 2a of the joint body 2 is closed. Moreover, the packing 3 comprised as mentioned above is inserted in the insertion hole part 2a so that attachment or detachment is possible from the pipe insertion side of the coupling main body 2 in this example.
[0032]
A movable front cylinder 4 is disposed on the pipe insertion side of the joint body 2. The movable front cylinder 4 is made of metal and has a reduced diameter tapered hole portion 4a that is reduced in diameter toward the distal end, and is present on the distal end side of the reduced diameter tapered hole portion 4a so that the enlarged diameter distal end portion 1c can be inserted. It has a structure having a small-diameter hole portion 4b having an inner diameter and a guide portion 4c that is tapered from the small-diameter hole portion 4b toward the tip and facilitates insertion of the large-diameter tip portion 1c of the pipe 1. . The movable front cylinder 4 has a small-diameter portion 4d at the outer periphery of the tip and a large-diameter portion 4e at the rear portion.
[0033]
A coil spring ring 5 for locking is disposed in a space formed by the pipe insertion side end of the joint body 2 and the reduced diameter tapered hole 4a opened at the rear end of the movable front cylinder 4. The lock coil spring ring 5 contains a plurality of balls for preventing deformation of the coil. The coil spring ring 5 for locking usually has an inner diameter larger than the insertion hole 2a of the joint body 2, and when the diameter is reduced, the inner diameter is smaller than the insertion hole 2a. The pipe 1 is inserted into the pipe 2 so that the pipe 1 is engaged with the diameter-expanded step 1b of the diameter-expanded tip 1c.
[0034]
An operation sleeve 6 is provided on the outer periphery of the movable front cylinder 4 and the pipe insertion side outer periphery of the joint body 2 so as to be rotatable with the movable front cylinder 4 and integrated in the axial direction. It is fitted so as to be rotatable and movable in the axial direction. When the operation sleeve 6 moves to the proximal end side of the joint body 2, the movable front cylinder 4 is moved in the same direction to reduce the diameter. When the diameter of the locking coil spring ring 5 is reduced on the small diameter side of the tapered hole 4a and moved to the pipe insertion side of the joint body 2, the movable front cylinder 4 is moved in the same direction to reduce the diameter. The diameter of the locking coil spring ring 5 is released on the large diameter side of the hole 4a to increase the diameter.
[0035]
More specifically, in the operation sleeve 6 and the movable front cylinder 4, the operation sleeve 6 has an inner flange portion 6 a at the tip, and a small diameter portion of the movable front cylinder body 4 is located in the inner flange portion 6 a. The inner flange portion 6a is fitted to the outer periphery of 4d, and the inner flange portion 6a is composed of a ball 7 provided between the small diameter portion 4d and the large diameter portion 4e and a stop ring 8 provided on the outer periphery of the small diameter portion 4d. The operation sleeve 6 and the movable front cylinder 4 are integrally movable in the axial direction so as to be sandwiched and supported. A plurality of balls 7 provided between the small diameter portion 4d and the large diameter portion 4e are provided so as to be able to rotate a plurality of times in the circumferential direction of the movable front cylinder 4, and an inner peripheral surface and an inner flange portion of the operation sleeve 6 are provided. The operation sleeve 6 is supported in contact with the inner side of 6a, so that the rotation of the operation sleeve 6 is not transmitted to the movable front cylinder 4 by the ball 7.
[0036]
Further, in the operation sleeve 6 and the joint body 2, the operation sleeve 6 is provided with a guide groove 9 in an inclined state with respect to the axial direction of the joint body 2, and the joint body 2 includes the guide groove 9. A guide pin 10 that is engaged with the screw 9 is screwed. When the operation sleeve 6 is rotated forward and backward, the operation sleeve 6 is moved in the axial direction by the guide pin 10 that is engaged with the guide groove 9. It has become.
[0037]
The movement distance of the operation sleeve 6 in the axial direction is regulated by the axial length from one end of the guide groove 9 to the other end, and the operation sleeve 6 moves to the pipe insertion side of the joint body 2. When the guide pin 10 is positioned on the rear end side (left side in FIG. 1) of the guide groove 9, the locking coil spring ring 5 is formed by the reduced diameter tapered hole portion 4 a of the movable front cylinder 4 that moves together with the operation sleeve 7. Is released (see FIG. 1), the operating sleeve 6 moves to the proximal end side of the joint body 2, and the guide pin 10 is positioned on the front end side (upper right side in FIG. 1) of the guide groove 9. At this time, it is set so that the diameter of the locking coil spring ring 5 is reduced on the small diameter side of the reduced diameter tapered hole portion 4a of the movable front cylinder 4 that moves together with the operation sleeve 6.
[0038]
Further, by engaging a guide pin 10 engaged with the position on the front end side on the front end side of the guide groove 9, the locking coil spring ring 5 is formed on the small diameter side of the reduced diameter tapered hole portion 4a. A lock groove portion 9a is provided to prevent the operation sleeve 6 in the reduced diameter state from rotating so as not to return to the pipe insertion side of the joint body 2.
[0039]
A hole 11 is provided in the joint body 2 so as to open to the outer periphery, and a lock ball 12 having a diameter larger than the groove width of the guide groove 9 is provided in the hole 11 by a spring 13. It is urged | biased in the direction which protrudes from, and is inserted. In the lock ball 12, the operation sleeve 6 moves to the pipe insertion side of the joint body 2, and the lock coil spring ring 5 expands on the large diameter side of the reduced diameter tapered hole 4a of the movable front cylinder 4. In this state, the operation sleeve 6 is pressed in the centripetal direction on the inner peripheral surface of the operation sleeve 6 and is immersed in the hole 11, and the operation sleeve 6 moves to the proximal end side of the joint body 2 to move the movable front cylinder. When the diameter of the locking coil spring ring 5 is reduced on the smaller diameter side of the diameter-reduced taper hole portion 4a, the spring 13 is biased toward the rear end side of the guide groove 9 provided in the operation sleeve 6. The rotation of the operating sleeve 6 is prevented so that the operating sleeve 6 does not return to the distal end side due to a part of the engaging sleeve.
[0040]
A lock display portion 14 is provided on the outer periphery of the joint body 2 so as to be exposed when the operation sleeve 6 is in the forward movement position and indicating that the operation sleeve 6 is in an unlocked state. By checking whether it is exposed or not, it is possible to know whether or not the operation sleeve 6 is in a locked state.
[0041]
In the rear hole 2b communicating with the insertion hole 2a of the joint body 2, it is screwed in the axial direction, inserted from the pipe insertion side of the joint body 2, and slid in the insertion hole 2a in the axial direction. A packing presser 15 is provided that abuts against the packing 3 that can be fitted and adjusts the axial position of the joint body 2 of the packing 3, and the length of the diameter-expanded tip 1 c of the pipe 1 varies. Even so, by moving and adjusting the position of the packing retainer 15 in the axial direction, the position of the packing 3 in the insertion hole 2a of the joint body 2 is adjusted according to the length of the diameter-expanded tip 1c of the pipe 1. Be able to. The packing retainer 15 is fixed at its position relative to the joint body 2 by a packing retainer position fixture 16 made of screws screwed into the joint body 2.
[0042]
Next, an operation for connecting the pipe 1 to the thus configured pipe joint will be described. Before connection of the pipe 1 to this pipe joint, it is as shown in FIG.1 and FIG.2. In this state, the operation sleeve 6 is in the forward position, and the locking coil spring ring 5 is on the large diameter side of the diameter-reduced taper hole 4a and is not reduced in diameter. Further, in this state, the lock display portion 14 is exposed, indicating that the operation sleeve 6 is in an unlocked state.
[0043]
In this state, the diameter-expanded tip 1c of the pipe 1 is inserted into the insertion hole 2a of the joint body 2 through the small diameter hole 4b of the movable front cylinder 4. As a result, the packing 3 is pushed and moved by the tip of the diameter-expanded tip 1c of the pipe 1 and abuts against the packing retainer 15 to prevent further movement, and the packing 3 in the insertion hole 2a of the joint body 2 is prevented. The position is fixed. Further, when the insertion of the enlarged diameter tip portion 1c of the pipe 1 is continued, the small diameter portion 3b of the packing 3 is press-fitted into the enlarged diameter tip portion 1c of the pipe 1 and comes into airtight and liquid tight contact with the inner surface of the enlarged diameter tip portion 1c.
[0044]
Next, when the operation sleeve 6 is rotated in the circumferential direction, a guide groove 9 provided in the operation sleeve 6 in a state inclined with respect to the axial center direction of the joint body 2 and the joint body 2 are provided so as to project. Due to the action of the guide pin 10 fitted in the guide groove 9, the operation sleeve 6 moves to the proximal end side of the joint body 2, and the movable front cylinder 4 also moves together with the movement of the operation sleeve 6, Accordingly move also reduced diameter tapered hole portion 4a of the movable front cylindrical body 4, the locking coil spring ring 5 at smaller diameter side of the reduced diameter tapered hole portion 4a as shown in FIGS. 5 and 6 is pressed in the centripetal direction The diameter of the pipe 1 is reduced, and the outer peripheral portion of the diameter-expanded step portion 1b of the pipe 1 is locked by locking it, whereby the pipe 1 is connected.
[0045]
At this time, a plurality of balls 7 that contact the inner peripheral surface of the operation sleeve 6 and support the operation sleeve 6 are provided on the outer periphery of the movable front cylinder 4 so as to rotate in the circumferential direction. Since the rotation of the operation sleeve 6 is not transmitted to the front cylinder 4 and only the movement in the axial direction is transmitted, the movable front cylinder 4 moves without rotation and is locked by the reduced diameter tapered hole 4a. Since the coil spring ring 5 is pressed, the diameter of the locking coil spring ring 5 can be smoothly and reliably reduced.
[0046]
The operation sleeve 6 moving to the proximal end side of the joint body 2 is in a state where the lock coil spring ring 5 is reduced in diameter on the small diameter side of the reduced diameter tapered hole portion 4a, and the lock pin 10 is The rotation is prevented by entering the lock groove 9a, and the lock ball 12 inserted in the hole 11 opened on the outer periphery of the joint body 2 is urged by the spring 13 and is provided on the operation sleeve 6. Since the operation sleeve 6 is prevented from rotating by engaging with the guide groove 9, the connection of the pipe 1 becomes more reliable.
[0047]
Further, when the pipe 1 is separated, the operation sleeve 6 is rotated and moved to the pipe insertion side of the joint body 2. As a result, the movable front cylinder 4 is moved in the same direction so that the reduced diameter tapered hole 4a is separated from the locking coil spring ring 5 and released from the pressing by the reduced diameter tapered hole 4a. The ring 5 is enlarged by a restoring force on the large diameter side of the diameter-reduced tapered hole 4 a, enables the pipe 1 to be extracted, and can be easily separated by pulling the pipe 1 from the joint body 2.
[0048]
When the operation sleeve 6 is rotated, the guide pin 10 is engaged with the lock groove 9 a of the guide groove 9 provided in the operation sleeve 6, and the guide pin 9 is inserted into the hole 11 of the joint body 2. The lock ball 12 is locked to prevent the operation sleeve 6 from rotating. However, the guide pin 10 can be easily removed from the lock groove portion 9a by moving the operation sleeve 6 slightly backward toward the proximal end of the joint body 2. When the operation sleeve 6 is turned strongly, the lock ball 12 that has been locked in the guide groove 9 is pushed into the hole 11, so that the operation sleeve 6 can be rotated.
[0049]
In the above example, the guide groove 9 is provided in the operation sleeve 6 and the guide pin 10 is provided in the joint body 2. However, the guide groove 9 may be provided in the joint body 2 and the guide pin 10 may be provided in the operation sleeve 6. Good.
[0050]
In the above example, the packing 3 is formed integrally with the large-diameter portion 3a and the large-diameter portion 3a that are fitted in the insertion hole 2a of the joint body 2 in an airtight and liquid-tight manner. A small diameter portion 3b that is mounted in the expanded diameter distal end portion 1c and that is in a gas tight and liquid tight contact with the inner surface of the expanded diameter distal end portion 1c. The small diameter portion 3b is the expanded diameter distal end portion 1c of the pipe 1. In this example, the pipe joint is used as a plug of the pipe 1, but the packing 3 is fitted in the insertion hole 2 a of the joint body 2 in an airtight and liquid tight manner. A large-diameter portion 3a, and a small-diameter portion that is integrally formed with the large-diameter portion 3a and that is attached in the enlarged-diameter tip portion 1c of the pipe 1 and that is in contact with the inner surface of the enlarged-diameter tip portion 1c in an airtight and liquid-tight manner. with cylindrical structure consisting 3b, a the joint body 2, the insertion hole of該継hand body 2 The inserted pipe 1 to 2a can be used as a pipe joint for connecting with communicating state.
[0051]
In the above example, the pipe 1 is inserted into the insertion hole 2a of the joint body 2 from the state where the packing 3 is fitted in the insertion hole 2a of the joint body 2 in an airtight and liquid tight manner. The small diameter portion 3b that is the mounting portion of the packing 3 is press-fitted into the diameter-expanded tip portion 1c of the pipe 1 in advance to mount the packing 3 on the pipe 1, and the packing 3 together with the diameter-expanded tip portion 1c of the pipe 1 It may be inserted into the insertion hole 2a. At this time, if the small-diameter portion 3b is configured to block the opening of the pipe 1, it can also serve as a lid that prevents dust and the like from entering the pipe 1.
[0052]
Moreover, in the said example, although the packing 3 is inserted in the insertion hole 2a so that attachment or detachment is possible from the pipe insertion side of the coupling main body 2, it does not necessarily need to be removable. Further, the packing 3 is in airtight and liquid tight contact with the inner surface of the enlarged diameter tip portion 1c of the pipe 1, but is in contact with the end surface of the enlarged diameter tip portion 1c of the pipe 1 in an airtight and liquid tight manner. May be.
[0053]
【The invention's effect】
As described above, according to the pipe joint of the present invention, the movable front cylinder body is operated back and forth with the guide groove and the guide pin by simply rotating the operation sleeve in either the forward or reverse direction without using the cam mechanism. Therefore, the structure can be simplified and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an example of an embodiment of a pipe joint according to the present invention before a pipe is connected to the pipe joint.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a development view of a guide groove provided in the operation sleeve shown in FIG. 1;
4 is an enlarged front view of a locking coil spring used in FIG. 1. FIG.
FIG. 5 is a longitudinal side view showing a state in which a pipe is connected to the pipe joint of this example.
6 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe 1a Pipe main-body part 1b Diameter expansion step part 1c Diameter expansion front-end | tip part 2 Joint main body 2a Insertion hole part 2b Rear hole part 3 Packing 3a Large diameter part 3b Small diameter part 4 Movable front cylinder 4a Reduced diameter taper hole part 4b Small diameter hole Part 4c Guide part 4d Small diameter part 4e Large diameter part 5 Locking coil spring ring 6 Operation sleeve 6a Inner collar part 7 Ball 8 Stop ring 9 Guide groove 9a Lock groove part 10 Guide pin 11 Hole 12 Lock ball 13 Spring 14 Lock display part 15 Packing presser 16 Packing presser position fixing tool

Claims

A pipe joint in which the outer periphery of the diameter-expanded step portion of the pipe whose tip portion is the diameter-expanded tip portion through the diameter-expanded step portion is pressed and connected with a coil spring ring for locking,
A tubular joint body having an insertion hole portion having an inner diameter into which the diameter-expanded tip portion of the pipe can be inserted, and a gas-tight liquid on the tip or inner surface of the diameter-expanded tip portion of the pipe that is fitted in the insert hole portion in a gas-tight liquid-tight manner Packing in close contact, a diameter-reduced taper hole portion that is disposed on the pipe insertion side of the joint body and is reduced in diameter toward the tip, and is present on the tip side of the diameter-reduced taper hole portion, and expands the pipe. A movable front cylindrical body having a small-diameter hole portion into which a diameter tip portion can be inserted, a pipe insertion side end portion of the joint body, and a reduced diameter tapered hole portion opened at a rear end of the movable front cylindrical body. The coil spring ring for locking that holds the diameter-expanded step portion of the pipe inserted into the insertion hole of the joint body by reducing the diameter within the diameter-reduced taper hole, the outer periphery of the movable front cylinder, and the joint body Across the outer periphery of the cylinder, it is rotatable and axially movable with the movable front cylinder Is fitted to the joint body so as to be rotatable and movable in the axial direction so that the movable front cylinder is moved in the same direction when moved to the proximal end side of the joint body. When the diameter of the coil spring ring for locking is reduced on the small diameter side of the diameter-reduced taper hole and moved to the pipe insertion side of the joint body, the movable front cylinder is moved in the same direction to reduce the diameter. An operation sleeve for performing an operation for releasing the pressure of the locking coil spring ring on the large diameter side of the diameter taper hole and expanding the diameter, and either one of the joint body or the operation sleeve in the axial direction of the joint body A pipe joint comprising: a guide groove provided in an inclined state; and a guide pin supported by one of the joint body and the operation sleeve and engaged with the guide groove.

The outer periphery of the movable front cylinder body is provided with a plurality of balls that abut against the inner peripheral surface of the operation sleeve and support the operation sleeve so that they can rotate in the circumferential direction. Pipe fittings.

The guide groove is moved to the proximal end side of the joint body by engaging the guide pin with the diameter of the locking coil spring ring being reduced in diameter on the small diameter side of the reduced diameter tapered hole portion. 3. The pipe joint according to claim 1, wherein a lock groove portion is provided to prevent rotation of the operating sleeve so as not to return to the pipe insertion side.

When the guide groove is provided in the operation sleeve, a hole is provided in the joint body so as to open to the outer periphery, and a lock ball is urged in the hole by a spring so as to protrude from the outer periphery of the joint body. In the lock ball, the operating sleeve moves to the pipe insertion side of the joint body, and the lock coil spring ring expands on the large diameter side of the diameter-reduced taper hole of the movable front cylinder. In a state where the diameter is increased, the operation sleeve is pressed in the centripetal direction on the inner peripheral surface of the operation sleeve and is immersed in the hole, and the operation sleeve moves to the proximal end side of the joint body to reduce the diameter of the movable front cylinder. When the diameter of the locking coil spring ring is reduced on the small diameter side of the hole, the operating sleeve should not return to the pipe insertion side by engaging with the guide groove provided in the operating sleeve by the urging of the spring. Pipe joint according to claim 1, 2 or 3, characterized in that it is so as to prevent rotation thereof.

The said packing fitted in the insertion hole part of the said joint main body is inserted so that attachment or detachment is possible from the pipe insertion side of a joint main body, The 1, 2, 3, or 4 characterized by the above-mentioned. Pipe fittings.

The packing has a large-diameter portion fitted in an airtight and liquid-tight manner in the insertion hole portion of the joint body, and is integrally formed with the large-diameter portion and is in an air-tight and liquid-tight contact with the inner surface of the enlarged diameter tip portion of the pipe. The pipe joint according to claim 1, 2, 3, 4 or 5, wherein the pipe joint is composed of a small-diameter portion, and the small-diameter portion has a structure that closes an opening of the pipe.

The packing has a large-diameter portion that is fitted in an airtight and liquid-tight manner in the insertion hole portion of the joint body, and is integrally formed with the large-diameter portion and is in an air-tight and liquid-tight contact with the inner surface of the enlarged diameter tip portion of the pipe The pipe joint according to claim 1, 2, 3, 4, or 5, wherein the pipe joint has a cylindrical structure composed of a small diameter portion.

The packing integrally has a mounting portion that is mounted on the inside or outside of the diameter-expanded tip portion of the pipe, and is previously attached to the tip of the diameter-expanded tip portion of the pipe together with the diameter-expanded tip portion of the pipe. The pipe joint according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the pipe joint is inserted into an insertion hole of the joint body.

The pipe joint according to claim 8, wherein the mounting portion included in the packing includes the small diameter portion according to claim 6.

In the rear hole portion that communicates with the insertion hole portion of the joint body, there is provided a packing presser that is movably fitted in the axial direction and adjusts the axial position of the joint body of the packing. The pipe joint according to claim 5, 6, 7, 8, or 9.

The lock display portion is provided on an outer periphery of the joint main body, and is exposed when the operation sleeve is positioned on a pipe insertion side to indicate that the operation sleeve is in an unlocked state. A pipe joint according to 1, 2, 3, 4 , 5, 6 , 7 , 8 or 9.