JP4388291B2

JP4388291B2 - Rotating joint for pipes

Info

Publication number: JP4388291B2
Application number: JP2003057614A
Authority: JP
Inventors: 壽雄高城; 敦史猪本
Original assignee: Takagi Co Ltd
Current assignee: Takagi Co Ltd
Priority date: 2003-03-04
Filing date: 2003-03-04
Publication date: 2009-12-24
Anticipated expiration: 2023-03-04
Also published as: JP2004263843A

Description

【０００１】
【発明の属する技術分野】
本発明は、散水ノズルと家庭用ホースとの接続等に使用でき、継ぎ手を軸線と直交する方向に対して回転自在にすることでホース等の捩れを防止することのできる管用回転自在継ぎ手に関するものである。
【０００２】
【従来の技術】
近年、散水ノズルは、家庭用ホースを使用して庭に散水する場合に手元で散水弁の開閉を行うことができ、さらに散水の形状をシャワー状、霧状、ストレート状など手元で自在にかえることができ大変便利なため一般的に用いられている。
しかし、従来の散水ノズルは以下のような問題を有していた。
（１）散水ノズルを持ち歩いていろんな向きで繰り返し使用すると接続したホースに捩れが生じてホースがつぶれるため、ホースの管路が閉塞されて散水ノズルから水が出ない。
（２）ホースが捩れたままホース巻取機に巻き取ると、捩れを解消しないまま巻き取られるため、ホースを均一に巻き取ることが出来ない。
（３）均一にホースを巻き取るには散水ノズルを捩れと逆方向に回転させてホースの捩れを解消しながらホース巻取機に巻き取らなければならないため、作業性に劣り、ホース内に残っていた水が周囲に飛散する。
そこで、これらの問題を解決するために、管用回転自在継ぎ手が研究されている。
例えば、（特許文献１）には、「ノズル本体の基端部に、周面に環状溝部を有する基端固定管を連結すると共に、基端固定管の外側には、連結リングを介して回転管を回転自在に遊嵌し、回転管の下端は、ホースの先端を取り外し自在に連結可能とし、更には、連結リングには、回転管の外周面に形成された嵌入溝部に嵌入自在の爪部を内方に向かって複数個突設すると共に、該爪部は基端固定管の環状溝部に摺動自在に嵌着すべく構成することにより、連結リングと回転管とを一体に、基端固定管の外周で回転可能に構成したもの」が開示されている。
また、（特許文献２）には、「先端側に、基端筒部の外径より外径が大きい先端筒部を備えた雄継ぎ手を、その先端筒部の外周にリング状パッキングを設けてその先端筒部を雌継ぎ手に挿入することによって該雌継ぎ手に対して前記雄継ぎ手が軸線回りに回転自在に接続される構造をなし、散水ノズル等とホース等との接続に用いられる管用回転自在継ぎ手であって、前記雌継ぎ手は、内周面に凹部が形成された筒状をなす雌継ぎ手本体と、適度の弾性を有してリング状をなし弾性変形により縮径されることによって前記雌継ぎ手本体の内側に挿入され、拡径して前記雌継ぎ手本体の凹部に抜け止め状に嵌着される凸部を備えると共に内側に曲げられてなる係止片を有する係止部材とを有してなり、該係止部材は、その凸部が前記雌継ぎ手本体の凹部に嵌着された際において該係止片のなす最小内径が、挿入される前記雄継ぎ手の先端筒部の外径より小径となるとともに、該先端筒部が挿入されることによって拡径され、かつ該先端筒部が前記雌継ぎ手の係止片を越えて先端側に位置することによって該係止片が前記雄継ぎ手の基端筒部の外周面側において縮径してその先端筒部の後端面側に抜け止め状に係止する構成をなすようにしたもの」が開示されている。
【０００３】
【特許文献１】
特開平４−７８４５８号公報
【特許文献２】
特開平１０−２３８６７８号公報
【０００４】
【発明が解決しようとする課題】
しかしながら上記従来の技術は、以下のような課題を有していた。
（１）別途製作した連結リング又は係止部材を必要とするので部品点数が多く生産性に欠ける。
（２）連結リング又は係止部材を別途本体に取付けねばならず、作業が煩雑で作業性に欠けるとともに、工数を多く要するので、生産性に欠ける。
【０００５】
本発明は上記従来の課題を解決するもので、接続するホース等の捩れを容易に解消することができ、部品点数が少なく、製作時や組立時の作業性に優れるとともに、簡単な構造で著しく生産性に優れた管用回転自在継ぎ手を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記従来の課題を解決するために本発明の管用回転自在継ぎ手は、以下の構成を有している。
本発明の請求項１に記載の管用回転自在継ぎ手は、略筒形状に形成され外周面に係止用環状溝部を有する基端固定管と、略筒形状に形成され一端にフランジを有し前記基端固定管に外嵌された回転管と、前記回転管の周面に開設された係止部用窓部と、前記係止部用窓部の内側に舌片状に形成された係止部本体と、前記係止部本体の先端内側に突設され前記係止用環状溝部に抜け止め状に係止される係止爪部と、前記回転管の外周側に前記係止部用窓部と連設されたカバー体挿着フランジと、略筒形状に形成され内側に前記カバー体挿着フランジに係止されるカバー体挿着用突部が突設され前記係止部本体に外嵌されるカバー体と、を備えた構成を有している。
この構成により、以下のような作用が得られる。
（１）係止部本体と係止爪部と回転管とを一体に形成したので、従来のように係止手段を別途必要とせず部品点数を減らすことができる。
（２）係止部本体と係止爪部と回転管とを一体に形成しているので、従来のように係止手段を別途組込む作業を必要とせず製作及び取付の工数を減らすことができる。
（３）基端固定管に回転管を挿入するだけで係止部本体の弾性により係止爪部が係止用環状溝部に遊嵌し係止され抜けることがないので組立作業性を著しく向上させることができる。
（４）係止部用窓部の内側に係止部本体が形成されることで、製作時及び組立時に引っ掛けたりする事故が防止できる。
（５）カバー体を係止部本体に外嵌することにより係止部本体に外部から荷重がかかるのを防ぎ保護することができる。
（６）カバー体挿着フランジにカバー体挿着用突部を係止することで係止部本体をカバー体で保護すると共にカバー体が脱落するのを防ぐことができる。
【０００７】
ここで、基端固定管及び回転管の材質としては、合成樹脂、特にＡＢＳ等の樹脂は軽量で成形性に優れているため、好適に用いられる。また、耐油性の合成樹脂は、水のみでなく、油脂成分の混入した水や油脂そのものを基端固定管に流すことができ耐久性に優れるため、好適に用いられる。
係止部本体は、回転管に１及至複数箇所形成され、係止部本体の形状は、軸線方向に長い長方形、軸線方向に短い長方形、正方形、三角形などが用いられる。特に、軸線方向に長い長方形は、内方からの力に対する外側への反りが大きく取れることから係止爪部を係止用環状溝部に係止する際に係止部本体が反りに耐えられなくなって折れたりすることが無く耐久性に優れるため、好適に用いられる。
係止部本体の断面の形状は、両面とも平板状、両面とも回転管の形状に合わせた曲面板状、外側の面は平板状で内側の面が回転管の形状に合わせた曲面板状、外側の面が回転管の形状に合わせた曲面板状で内側の面が平板状などが用いられる。特に、両面とも回転管の形状に合わせた曲面板状は、厚さが均一であり耐久性に優れ、また基端固定管と係止部本体との隙間が無くなることで荷重が均一にかかるようになるため、好適に用いられる。
基端固定管及び回転管の内部には、必要に応じて補強リブを設けることができる。これにより、基端固定管及び回転管の強度を高めることができ、好ましい。補強リブの向きは、軸方向に平行、軸方向に垂直に形成してもよいが、軸方向に平行であるほうが、水流に対する抵抗が小さく均一に補強することができるので、好ましい。
基端固定管及び回転管の外周にも、必要に応じて補強リブを設けることができる。これにより、基端固定管及び回転管の強度を高めることができるので、好ましい。補強リブの向きは、軸方向に平行、軸方向に垂直に形成してもよいが、軸方向に垂直であるほうが、周方向に均一に補強することができるため、好ましい。
係止爪部の形状は、基端固定管の外周に合わせて円弧状に形成するのが好ましい。これにより、係止爪部が係止用環状溝部へ係止する際にスムーズに入れることができ、係止爪部への荷重を均一にすることができる。
また、係止爪部は、係止部本体の端部に係止用環状溝部に平行して直線状に形成する方法、係止部本体の端部に係止用環状溝部に平行して複数箇所形成する方法などが用いられる。特に、係止部本体の端部に係止用環状溝部に平行して直線状に形成する方法は、係止部本体への荷重が均一にかかるようになるため、好適に用いられる。
また、係止爪部の断面形状としては、三角形状、台形状、片側が垂直な台形状、方形状、半円状、円弧状などが用いられる。特に、断面形状が、基端固定管を挿入する側の端面が傾斜をなしもう一方の係止爪部の端面が垂直である台形状は、係止爪部を係止する際には容易に入れることができ、また、いったん係止すると今度は逆側が垂直であることでより外れにくくなるため、好適に用いられる。
【０００８】
前記回転管が、前記フランジに一辺が連設され前記回転管の周面に開設された係止部用窓部と、前記フランジに連設され前記係止部本体の両側部に前記係止部用窓部の枠部を構成する窓補強リブと、を備えており、前記係止部本体が、前記フランジに連設して前記係止部用窓部の枠部内に形成されている場合、フランジに係止部本体が連設され、更に係止部本体の両側部に係止部用窓部の枠部を構成する窓補強リブがフランジに連設されているので係止部本体の強度が高めることができる。
【０００９】
ここで、係止部用窓部の枠部に環状の補強リブを設けることにより回転管の強度を補強することができる。
【００１１】
ここで、カバー体挿着用突部の形状は、カバー体挿着フランジの端部に当接する部分は軸線に垂直で回転管を挿入する側の端面は傾斜面に形成される。これにより、カバー体を係止するときには容易に挿入でき、反対には容易に外れないため、好適に用いられる。
カバー体の材質については、プラスチックが成形に優れ、耐久性に優れるため、好適に用いられる。
カバー体の外周面は、凹凸を設けるなどすることができ、これによりカバー体の組立作業が容易になり、作業性及び運用性に優れる。
【００１２】
本発明の請求項２に記載の発明は、請求項１に記載の管用回転自在継ぎ手であって、前記係止部本体が、前記係止部本体の外側に突設され断面形状が三角形状、台形状、片側が垂直な台形状、方形状、半円状、円弧状のいずれかの形状に形成された外れ防止突部を備えた構成を有している。
この構成により、請求項１に記載の作用に加えて以下のような作用が得られる。
（１）組立時に係止部本体の係止爪部の係止不足があった場合外れ防止突部が外側に出っ張った状態となり、カバー体を本来の嵌めこみ位置まできちんと外嵌できないため、組立作業者が容易に基端固定管と回転管との係止不足を検出することができるため、作業性に優れる。
（２）カバー体を係止部本体に外嵌させることで、回転管が抜け方向に強く引っ張られた際に係止爪部に外方へ向かう力がかかった場合でも、外れ防止突部がカバー体内壁により規制される為、係止爪部が係止用環状突部から外れることが無く、部品結合度の信頼性に優れる。
【００１３】
ここで、外れ防止突部の形状は係止爪部の前述のものと同様なものが用いられる。係止爪部の係止用環状突部との当接面は軸線方向に対して凸に傾斜して形成されるのが好ましい。
また、外れ防止突部の高さは、カバー体挿着フランジと同一か少し低く形成される。これによりカバー体の挿着を容易に行うことができる。
本発明の請求項３に記載の発明は、請求項１又は２に記載の管用回転自在継ぎ手であって、前記カバー体挿着フランジに形成された切り欠き状のガイド挿入部と、前記カバー体の内周壁の軸線方向に突条又は突起状に形成されたガイド部と、を備えた構成を有している。
この構成により、請求項１又は２に記載の作用に加えて以下のような作用が得られる。
（１）カバー体のガイド部を回転管のガイドレール部へと合わせて押しこみ、ガイド挿入部にガイド補強部が嵌着されると、同時にカバー体のカバー体挿着用突部がカバー体挿着フランジの環状段差部に係止されることによりカバー体がカバー体挿着フランジに強固に係止され、カバー体を回転管に外嵌させることができる。
（２）ガイド補強部をガイド部とＴ字型になるように一体に又は不連続で形成した場合、カバー体に回転力がかかっても回転管とカバー体とが空回りすることがない為、カバー体を手で固定した状態で回転管とロックナットの緊締具螺合部と螺合でき、ホースＨの取付け時の操作性を向上できる。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を、図１又至図７を参照しながら説明する。
（実施の形態１）
図１は散水ノズルに実施の形態１における管用回転自在継ぎ手を装着した状態を示す断面端面図である。図１において、１は実施の形態１における管用回転自在継ぎ手であって、基端固定管２は一端部に散水ノズルと連結する連結手段３を有している。また、１０１は散水ノズルであって、ピストル型に形成されたノズル本体１０２とノズル本体１０２の端部にめねじを施した連結手段１０３とから形成されており、連結手段１０３により基端固定管２の連結手段３と連結されている。
【００１５】
次に、実施の形態１の管用回転自在継ぎ手の各部の詳細について図面を用いて説明する。
図２は管用回転自在継ぎ手の要部断面図であり、図３（ａ）は管用回転自在継ぎ手の回転管の斜視図であり、図３（ｂ）はその側面図であり、図４は図２のＡ−Ａ矢視断面図であり、図５は図２のＢ−Ｂ矢視断面図であり、図６（ａ）は実施の形態１における管用回転自在継ぎ手の組立前の分解斜視図であり、図６（ｂ）は実施の形態１における管用回転自在継ぎ手の組立前の分解側面図である。
図２及至図６において、２は基端固定管であって、ＡＢＳ等の合成樹脂等で成形され基端筒部２ａと中央筒部２ｂと先端筒部２ｃにより同芯の異径円筒形状に形成され、基端筒部２ａの外周面におねじを施した連結手段３が形成されている。そして、基端固定管２には、中央筒部２ｂの外周面に基端筒部２ａ側から順に、基端フランジ部４、環状リブ５がそれぞれ軸線方向に垂直に環状に突設され、係止用環状溝部６が軸線方向に垂直に周設され、さらに係止用環状突部７が先端筒部２ｃ側に適度の角度の傾斜を有して軸線方向に垂直に環状に突設されている。また、先端筒部２ｃの外周面にはＯ−リング用溝部８が軸線方向に垂直に周設され、このＯ−リング用溝部８に水密用のＯ−リング９が嵌着されている。なお、係止用環状溝部６の外径Ｄ１は、先端筒部２ｃの外径Ｄ２より小さく形成されている。
また、１０は基端固定管２の一端に端部側が挿着された回転管であって、前述の合成樹脂等で成形されフランジ１１を端部に有し、管部がカバー体挿着フランジ１３側から基端固定管２の先端筒部２ｃを挿着する先端筒部挿着部１２ａ、小径筒部１２ｂ及びホースＨが外嵌されるホース嵌着部１２ｃにより同芯の異径円筒形状に形成されている。小径筒部１２ｂの外周面は延設されホースＨの先端部を嵌合する嵌合凹部１２ｄを開けてロックナット螺合部１２ｅが形成されている。尚、嵌合凹部１２ｄの底壁にはロックナット螺合部１２ｅを補強する補強リブ１２ｆが形成されている。
先端筒部挿着部１２ａの基部の外周に形成されたカバー体挿着フランジ１３とフランジ１１との間の対向する２箇所に一辺がフランジ１１に連設され回転管１０の周面に開設された係止部用窓部１４を有している。係止部用窓部１４の側部には各々窓補強リブ１４ａ，１４ｂがカバー体挿着フランジ１３と同一の高さでフランジ１１に連設して立設され枠部を形成している。係止部用窓部１４の枠部内に基部がフランジ１１の内縁側に舌片状に連設された係止部本体１５を備えている。係止部本体１５の端部には、内側に円弧状又は矩形状に突設され基端固定管２の係止用環状突部７の係止用環状溝部６側の周壁に当接し抜け止め状に係止される係止爪部１５ａと、外側に係止爪部１５ａが係止用環状突部７から外れるのを防止する外れ防止突部１５ｂが形成されている。係止爪部１５ａはフランジ１１側が係止部本体１５の弾性率に応じた角度で傾斜して形成された傾斜面１５ａ’を有し、カバー体挿着フランジ１３側には当接面１５ａ”が形成されている。各窓用補強リブ１４ｂの外側にはガイドレール部１６を挟んでガイドレール用リブ１７が各々形成されている。カバー体挿着フランジ１３とフランジ１１との間の外周面に外れ防止突部１５ｂと同一線上で後述するカバー体を保持するカバー体保持リブ１８が周設されている。カバー体保持リブ１８の高さは、カバー体挿着フランジ１３と同一高さでかつカバー体挿着フランジ１３と平行に設けられている。カバー体保持リブ１８の両端は窓補強リブ１４ａとガイドレール用リブ１７に連設するか離して形成してもよい。ガイドレール部１６の端部のカバー体挿着フランジ１３は切り欠かれガイド挿入部１９が形成されている。また、ロックナット螺合部１２ｅの螺子部１２ｅ’はガイドレール部１６の延長線上で後述するガイド部を嵌通させるため切り欠き形成されたガイド嵌通部２０が形成されている。
【００１６】
カバー体２１の内周壁にはカバー体２１の基端固定管２側の一端に少し拡径した段差部２２と、段差部２２の周端面より軸線方向に突条又は数個の突起状に形成されたガイド部２３と、ガイド部２３の端部にガイド部２３と同一高さでＴ字形になるように形成されたガイド補強部２４を有している。カバー体２１の他端側内周壁にはガイド部２３から周方向へ所定の間隔で回転管１０の環状段差部１３ａに係止する１以上のカバー体挿着用突部２５が突設されている。フランジ１１は段差部２２と嵌合するためカバー保持リブ１８などよりも少し高く形成され、カバー体２１を外嵌したときにカバー体２１の端面が基端フランジ部４の外周面と略面一になるように形成されている。これにより、基端固定管２の偏荷重による破損を防止できる。
ガイド補強部２４はガイド部２３とＴ字型になるように一体に又は不連続で形成されている。これによりカバー体２１に回転力がかかっても回転管１０とカバー体２１とが空回りすることがない為、カバー体２１を手で固定した状態で回転管１０と後述するロックナット２７の緊締具螺合部２８と螺合でき、ホースＨの取付け時の操作性を向上できる。カバー体挿着用突部２５はカバー体挿着フランジ１３の外周側に厚み方向に浅く形成された環状段差部１３ａに当接される。
【００１７】
ホース嵌着部１２ｃにはホースＨが外嵌される。ホースＨの外周面は緊締具２６で緊締されている。緊締具２６は円錐台状に形成されホース先端側の一端側から線状切り欠き部２６ａ，他端側から線状切り欠き部２６ｂが形成され伸縮自在に形成されている。また、他端側の内周には爪部２６ｃが形成されホースＨに爪部２６ｃが食い込みホースＨの抜け防止が図られている。
緊締具２６はロックナット２７を緊締具２６に外嵌させ、ロックナット２７の緊締具螺合部２８とロックナット螺合部１２ｅとを螺着させることにより爪部２６ｃがホースＨに食い込むように形成されている。
なお、回転管１０のホース嵌着部１２ｃの内周面に軸方向に対して平行に回転管内補強リブ１２ｇが、放射状に等間隔で突設されている。これにより回転管１０の耐久性を向上させることができる。
【００１８】
以上のように構成された実施の形態１の管用回転自在継ぎ手１について、以下組立方法を図１及至図７を参照しながら説明する。図７は基端固定管に回転管を外嵌する際の模式図である。
Ｏ−リング９を基端固定管２のＯ−リング用溝部８に嵌着させる。次いで、図７に示すように回転管１０を基端固定管２の先端筒部２ｃ側から奥へと押しこむと係止爪部１５ａが基端固定管２の係止用環状突部７の角に接触する。次いで、さらに奥へ押しこむことで、係止爪部１５ａが進行方向に対して傾斜を有しているため係止爪部１５ａに対して外側に向かう力がかかり、それにより点線で示すように係止部本体１５が外側に向かって反りを生じて奥へと押しこまれるようになる。次いで、さらに奥に押しこむことで図２に示すように係止爪部１５ａが係止用環状溝部６に嵌入し、当接面１５ａ”が係止用環状突部７の係止用環状溝部６側の周壁に当接し抜け止め状に係止される。いったん係止された後には、回転管１０を抜く方向の引っ張る力に対しては、係止部本体１５の弾性力で撓み係止爪部１５ａが係止用環状溝部６の奥に入り当接面１５ａ”が広く当接し、これにより回転管１０を基端固定管２に強固に係止することができる。また、回転管１０は基端固定管２の軸線周りの方向へは係止爪部１５ａの当接面１５ａ”が摺動可能なので自由に回転することができる。
次いで、図６に示すカバー体２１のガイド部２３を回転管１０のガイドレール部１６へと合わせて押しこみ、ガイド挿入部１９にガイド補強部２４が嵌着されると、同時にカバー体２１のカバー体挿着用突部２５が図２に示すようにカバー体挿着フランジ１３の環状段差部１３ａに係止されることによりカバー体２１がカバー体挿着フランジ１３に強固に係止され、カバー体２１を回転管１０に外嵌させることができる。また、この時カバー体２１の段差部２２は回転管１０のフランジ１１と嵌合している。これにより、回転管１０を抜く方向の引っ張る力に対しては係止部本体１５の弾性力で撓み係止爪部１５ａが係止用環状溝部６の奥に入り当接面１５ａ”が広く当接し、これにより回転管１０を基端固定管２に強固に係止することができる。さらに強く、回転管１０を抜く方向に引っ張る力がかけられた場合には、係止爪部１５ａが係止用環状溝部６から外れる方向に係止部本体１５が撓むが、カバー体２１に外れ防止突部１５ｂが当接し係止爪部１５ａが係止用環状突部７から外れるのを防止することができるため、回転管１０が基端固定管２から外れるのを防止することができる。また、外れ防止突部１５ｂを設けている為、組立段階で係止爪部１５ａが係止用環状溝部６への係止不足があった場合に外れ防止突部１５ｂが本来嵌めこむ位置に届かず、その後組立てるカバー体２１が外嵌できないことから係止爪部１５ａの係止不足を見分けることができるため、作業性に優れる。
次いで、図２に示すようにホースＨにロックナット２７、緊締具２６の順に外嵌した後、ホースＨを回転管１０のホース嵌着部１２ｃに外嵌させ、次いで、緊締具２６をホースＨの外周面に外嵌させ、ロックナット２７をロックナット螺合部１２ｅに螺着し緊締具２６をホースＨの外周面に緊締する。これにより、緊締具２６の爪部２６ｃがホースＨに食い込み、ホースＨが抜けるのを防止できる。
【００１９】
以上のように実施の形態１における管用回転自在継ぎ手は構成されているので、以下のような作用が得られる。
（１）係止部本体と係止爪部と回転管とを一体に形成したので、従来のように係止手段を別途必要とせず部品点数を減らすことができる。
（２）係止部本体と係止爪部と回転管とを一体に形成しているので、従来のように係止手段を別途組込む作業を必要とせず製作及び取付の工数を減らすことができる。
（３）基端固定管に回転管を挿入するだけで係止部本体の弾性により係止爪部が係止用環状溝部に遊嵌し係止され抜けることがないので組立作業性を著しく向上させることができる。
（４）フランジに係止部本体が連設され、更に係止部本体の両側部に係止部用窓部の枠部を構成する窓補強リブがフランジに連設されているので係止部本体の強度が高めることができる。
（５）係止部用窓部の内側に係止部本体が形成されることで、製作時及び組立時に引っ掛けたりする事故が防止できる。
（６）カバー体を係止部本体に外嵌することにより係止部本体に外部から荷重がかかるのを防ぎ保護することができる。
（７）カバー体挿着フランジにカバー体挿着用突部を係止することで係止部本体をカバー体で保護すると共にカバー体が脱落するのを防ぐことができる。
（８）組立時に係止部本体の係止爪部の係止不足があった場合外れ防止突部が外側に出っ張った状態となり、カバー体を本来の嵌めこみ位置まできちんと外嵌できないため、組立作業者が容易に基端固定管と回転管との係止不足を検出することができるため、作業性に優れる。
（９）カバー体を係止部本体に外嵌させることで、回転管が抜け方向に強く引っ張られた際に係止爪部に外方へ向かう力がかかった場合でも、外れ防止突部がカバー体内壁により規制される為、係止爪部が係止用環状突部から外れることが無く、部品結合度の信頼性に優れる。
（１０）回転管が回転自在であるため、ホース等を接続した場合に捩れが生じなく作業性に優れる。
（１１）任意の方向に回転させたい時にカバー体を回転させると同時に回転管を回転することができるため、利便性に優れる。
【００２０】
【発明の効果】
以上のように、本発明の管用回転自在継ぎ手は、請求項１に記載の発明によれば、以下のような有利な効果が得られる。
（１）係止部本体と係止爪部と回転管とを一体に形成したので、従来のように係止手段を別途必要とせず部品点数を減らすことができ、省資源性に優れた管用回転自在継ぎ手を提供することができる。
（２）係止部本体と係止爪部と回転管とを一体に形成しているので、従来のように係止手段を別途組込む作業を必要とせず製作及び取付の工数を減らすことができ、作業性に優れた管用回転自在継ぎ手を提供することができる。
（３）基端固定管に回転管を挿入するだけで係止部本体の弾性により係止爪部が係止用環状溝部に遊嵌し係止され抜けることがないので、組立時の作業性に優れた管用回転自在継ぎ手を提供することができる。
（４）係止部用窓部の内側に係止部本体が形成されることで、製作時及び組立時に引っ掛けたりする事故が防止できるため、作業性及び耐久性に優れた管用回転自在継ぎ手を提供することができる。
（５）カバー体を係止部本体に外嵌することにより係止部本体に外部から荷重がかかるのを防ぎ保護することができるため、耐久性に優れた管用回転自在継ぎ手を提供することができる。
（６）カバー体挿着フランジにカバー体挿着用突部を係止することで係止部本体をカバー体で保護すると共にカバー体が脱落するのを防ぐことができるため、利便性に優れた管用回転自在継ぎ手を提供することができる。
【００２３】
請求項２に記載の発明によれば、請求項１に記載の効果に加えて以下のような有利な効果が得られる。
（１）組立時に係止部本体の係止爪部の係止不足があった場合外れ防止突部が外側に出っ張った状態となり、カバー体を本来の嵌めこみ位置まできちんと外嵌できないため、組立作業者が容易に基端固定管と回転管との係止不足を検出することができ、作業性に優れた管用回転自在継ぎ手を提供することができる。
（２）カバー体を係止部本体に外嵌させることで、回転管が抜け方向に強く引っ張られた際に係止爪部に外方へ向かう力がかかった場合でも、外れ防止突部がカバー体内壁により規制される為、係止爪部が係止用環状突部から外れることが無く、部品結合度の信頼性に優れた管用回転自在継ぎ手を提供することができる。
請求項３に記載の発明によれば、請求項１又は２に記載の効果に加えて以下のような有利な効果が得られる。
（１）カバー体のガイド部を回転管のガイドレール部へと合わせて押しこみ、ガイド挿入部にガイド補強部が嵌着されると、同時にカバー体のカバー体挿着用突部がカバー体挿着フランジの環状段差部に係止されることによりカバー体がカバー体挿着フランジに強固に係止され、カバー体を回転管に外嵌させることができる。
（２）ガイド補強部をガイド部とＴ字型になるように一体に又は不連続で形成した場合、カバー体に回転力がかかっても回転管とカバー体とが空回りすることがない為、カバー体を手で固定した状態で回転管とロックナットの緊締具螺合部と螺合でき、ホースＨの取付け時の操作性を向上できる。
【図面の簡単な説明】
【図１】散水ノズルに実施の形態１における管用回転自在継ぎ手を装着した状態を示す断面端面図
【図２】管用回転自在継ぎ手の要部断面図
【図３】（ａ）管用回転自在継ぎ手の回転管の斜視図
（ｂ）管用回転自在継ぎ手の回転管の側面図
【図４】図２のＢ−Ｂ矢視断面図
【図５】図２のＣ−Ｃ矢視断面図
【図６】（ａ）実施の形態１における管用回転自在継ぎ手の組立前の分解斜視図
（ｂ）実施の形態１における管用回転自在継ぎ手の組立前の分解側面図
【図７】基端固定管に回転管を外嵌する際の模式図
【符号の説明】
１実施の形態１における管用回転自在継ぎ手
２基端固定管
２ａ基端筒部
２ｂ中央筒部
２ｃ先端筒部
３連結手段
４基端フランジ部
５環状リブ
６係止用環状溝部
７係止用環状突部
８Ｏ−リング用溝部
９Ｏ−リング
１０回転管
１１フランジ
１２ａ先端筒部挿着部
１２ｂ小径筒部
１２ｃホース嵌着部
１２ｄ嵌合凹部
１２ｅロックナット螺合部
１２ｅ’ 螺子部
１２ｆ補強リブ
１２ｇ回転管内補強リブ
１３カバー体挿着フランジ
１３ａ環状段差部
１４係止部用窓部
１４ａ，１４ｂ窓補強リブ
１５係止部本体
１５ａ係止爪部
１５ｂ外れ防止突部
１５ａ’ 傾斜面
１５ａ” 当接面
１６ガイドレール部
１７ガイドレール用リブ
１８カバー体保持リブ
１９ガイド挿入部
２０ガイド嵌通部
２１カバー体
２２段差部
２３ガイド部
２４ガイド補強部
２５カバー体挿着用突部
２６緊締具
２６ａ，２６ｂ線状切り欠き部
２６ｃ爪部
２７ロックナット
２８緊締具螺合部
１０１散水ノズル
１０２ノズル本体
１０３連結手段
Ｈホース
Ｄ１係止用環状溝部の外径
Ｄ２先端筒部の外径[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotatable joint for pipes that can be used for connecting a watering nozzle and a domestic hose, etc., and can prevent the hose from being twisted by making the joint rotatable with respect to a direction orthogonal to the axis. It is.
[0002]
[Prior art]
In recent years, the watering nozzle can open and close the watering valve at hand when watering the garden using a household hose, and the shape of the watering can be changed freely at the hand such as shower, mist, straight etc. It is generally used because it is very convenient.
However, the conventional watering nozzle has the following problems.
(1) If the watering nozzle is carried around and repeatedly used in various directions, the connected hose is twisted and the hose is crushed, so that the pipe line of the hose is blocked and water does not come out from the watering nozzle.
(2) If the hose is wound around the hose winder while being twisted, the hose cannot be evenly wound because it is wound without removing the twist.
(3) In order to wind up the hose uniformly, it is necessary to wind the hose winder while removing the hose twisting by rotating the watering nozzle in the direction opposite to the twisting, so that the workability is inferior and remains in the hose. Water that had been splattered around.
In order to solve these problems, a rotatable joint for a pipe has been studied.
For example, (Patent Document 1) states that “a base end fixing tube having an annular groove on the peripheral surface is connected to the base end portion of the nozzle body, and the outside of the base end fixing tube is rotated via a connection ring. Freely fitting the tube, the lower end of the rotating tube can be removably connected to the tip of the hose, and the coupling ring is a claw that can be fitted in a fitting groove formed on the outer peripheral surface of the rotating tube A plurality of protrusions projecting inward, and the claw portions are configured to be slidably fitted into the annular groove portion of the base end fixed tube, so that the connecting ring and the rotary tube are integrated with each other. "A structure configured to be rotatable on the outer periphery of the end fixed tube" is disclosed.
In addition, (Patent Document 2) states that “a male joint having a distal end cylinder portion having an outer diameter larger than the outer diameter of the proximal end tubular portion is provided on the distal end side, and a ring-shaped packing is provided on the outer periphery of the distal end tubular portion. By inserting the tip tube portion into the female joint, the male joint is connected to the female joint so as to be rotatable about its axis, and the pipe is used for connecting a watering nozzle or the like to a hose or the like. A female joint body having a cylindrical shape with a concave portion formed on an inner peripheral surface, and a ring shape having an appropriate elasticity and being reduced in diameter by elastic deformation. A locking member that is inserted inside the joint body, has a projecting portion that expands in diameter and is fitted into the recess of the female joint body in a retaining manner, and has a locking piece that is bent inward. The locking member has a convex portion with the female joint The minimum inner diameter formed by the locking piece when fitted into the concave portion of the male joint is smaller than the outer diameter of the distal end tubular portion of the male joint to be inserted, and the diameter is increased by inserting the distal end tubular portion. And the distal end tube portion is positioned on the distal end side beyond the engagement piece of the female joint, so that the engagement piece is reduced in diameter on the outer peripheral surface side of the proximal end tubular portion of the male joint. And the rear end face side of the portion are configured to be locked in a retaining manner ”.
[0003]
[Patent Document 1]
JP-A-4-78458 [Patent Document 2]
Japanese Patent Laid-Open No. 10-238678
[Problems to be solved by the invention]
However, the above conventional technique has the following problems.
(1) Since a separately produced connecting ring or locking member is required, the number of parts is large and productivity is lacking.
(2) The connection ring or the locking member must be separately attached to the main body, and the work is complicated and lacks workability, and the number of man-hours is large, so the productivity is lacking.
[0005]
The present invention solves the above-mentioned conventional problems, can easily eliminate twisting of a hose to be connected, has a small number of parts, is excellent in workability during production and assembly, and is remarkably simple in structure. The object is to provide a rotatable joint for pipes with excellent productivity.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the rotatable joint for pipes of the present invention has the following configuration.
According to a first aspect of the present invention, there is provided a rotatable joint for a pipe, which is formed in a substantially cylindrical shape and has a base end fixed pipe having an annular groove portion for locking on an outer peripheral surface, and a flange that is formed in a substantially cylindrical shape at one end. A rotating tube externally fitted to the proximal fixed tube, a locking portion window formed on a peripheral surface of the rotating tube, and a locking hook formed in a tongue shape inside the locking portion window portion A main body, a locking claw projecting on the inner side of the front end of the locking section main body and locking in a locking manner in the locking annular groove, and the locking section window on the outer peripheral side of the rotary tube And a cover body insertion flange that is formed in a substantially cylindrical shape and is engaged with the cover body insertion flange, and is fitted on the locking portion main body. And a cover body to be provided.
With this configuration, the following effects can be obtained.
(1) Since the locking portion main body, the locking claw portion, and the rotary tube are integrally formed, the number of parts can be reduced without requiring additional locking means as in the prior art.
(2) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is not necessary to separately incorporate the locking means as in the prior art, and the manufacturing and mounting man-hours can be reduced. .
(3) By simply inserting the rotating tube into the base end fixed tube, the locking claw portion is loosely fitted into the locking annular groove due to the elasticity of the locking portion body, so that the assembly workability is remarkably improved. Can be made.
(4) Since the locking portion main body is formed inside the locking portion window portion, it is possible to prevent accidents that may occur during manufacture and assembly.
(5) By externally fitting the cover body to the locking portion body, it is possible to prevent and protect the locking portion body from being loaded from the outside.
(6) By locking the cover body insertion protrusion to the cover body insertion flange, the locking body can be protected by the cover body and the cover body can be prevented from falling off.
[0007]
Here, as a material of the base end fixed tube and the rotating tube, a synthetic resin, in particular, a resin such as ABS is light and excellent in moldability, and thus is preferably used. In addition, the oil-resistant synthetic resin is preferably used because it can flow not only water but also water and fat / oil itself mixed with fat / oil components to the proximal end fixing tube and has excellent durability.
The locking portion main body is formed in one to a plurality of locations on the rotary tube, and the locking portion main body has a long rectangle in the axial direction, a short rectangle in the axial direction, a square, a triangle, or the like. In particular, the rectangular shape that is long in the axial direction has a large amount of warping to the outside due to the force from the inside, so that when the locking claw is locked to the locking annular groove, the locking portion body cannot withstand the warping. It is preferably used because it is not broken and has excellent durability.
The shape of the cross section of the locking part body is a flat plate shape on both sides, a curved plate shape that matches the shape of the rotating tube on both sides, a flat plate shape on the outer surface, and a curved plate shape whose inner surface matches the shape of the rotating tube, The outer surface is a curved plate shape matching the shape of the rotary tube, and the inner surface is a flat plate shape. In particular, the curved plate shape that matches the shape of the rotating tube on both sides is uniform in thickness and excellent in durability, and the load is uniformly applied because there is no gap between the base end fixed tube and the locking part body. Therefore, it is preferably used.
Reinforcing ribs can be provided inside the proximal end fixed tube and the rotating tube as necessary. Thereby, the strength of the proximal fixed tube and the rotating tube can be increased, which is preferable. The direction of the reinforcing rib may be formed parallel to the axial direction and perpendicular to the axial direction. However, it is preferable that the reinforcing rib is parallel to the axial direction because the resistance to water flow is small and the reinforcing can be performed uniformly.
Reinforcing ribs can be provided on the outer periphery of the base end fixed tube and the rotating tube as needed. Thereby, since the intensity | strength of a base end fixed tube and a rotary tube can be raised, it is preferable. The direction of the reinforcing rib may be formed parallel to the axial direction and perpendicular to the axial direction, but it is preferable that the reinforcing rib is perpendicular to the axial direction because the reinforcing rib can be uniformly reinforced in the circumferential direction.
The shape of the locking claw portion is preferably formed in an arc shape in accordance with the outer periphery of the proximal end fixing tube. Thereby, when a latching claw part latches to the annular groove part for latching, it can put in smoothly and the load to a latching claw part can be made uniform.
Further, the locking claw portion is formed in a straight line parallel to the locking annular groove at the end of the locking portion main body, and a plurality of locking claw portions parallel to the locking annular groove at the end of the locking portion main body. A method of forming a location is used. In particular, the method of forming the linearly parallel to the locking annular groove at the end of the locking part main body is preferably used because the load on the locking part main body is uniformly applied.
In addition, as the cross-sectional shape of the locking claw portion, a triangular shape, a trapezoidal shape, a trapezoidal shape with one side vertical, a rectangular shape, a semicircular shape, an arc shape, or the like is used. In particular, the trapezoidal shape in which the end surface on the side where the proximal end fixing tube is inserted is inclined and the end surface of the other locking claw portion is vertical is easy when locking the locking claw portion. It can be inserted, and once locked, it is less likely to come off because the opposite side is vertical this time.
[0008]
The rotating tube has a locking portion window portion provided on one side of the flange and opened on a peripheral surface of the rotating tube, and the locking portion provided on both sides of the locking portion body. Window reinforcing ribs constituting a frame portion of the window portion for use, and when the locking portion body is formed in the frame portion of the locking portion window portion in a continuous manner with the flange , The locking part body is connected to the flange, and the window reinforcing ribs that form the frame part of the locking part window part are connected to the flange on both sides of the locking part body. Can be increased.
[0009]
Here, the strength of the rotary tube can be reinforced by providing an annular reinforcing rib on the frame portion of the locking portion window portion.
[0011]
Here, the shape of the protrusion for inserting the cover body is such that the portion contacting the end of the cover body insertion flange is perpendicular to the axis and the end surface on the side where the rotary tube is inserted is formed as an inclined surface. Thereby, when the cover body is locked, it can be easily inserted, and conversely, it cannot be easily removed, so that it is preferably used.
Regarding the material of the cover body, plastic is preferably used because it is excellent in molding and excellent in durability.
The outer peripheral surface of the cover body can be provided with irregularities, etc., which makes it easy to assemble the cover body and is excellent in workability and operability.
[0012]
Invention of Claim 2 of this invention is a rotatable joint for pipes of Claim 1 , Comprising: The said latching | locking part main body protrudes on the outer side of the said latching | locking part main body, and cross-sectional shape is triangular shape, A trapezoidal shape, a trapezoidal shape that is vertical on one side, a square shape, a semicircular shape, and an arc shape are provided, and the structure includes a detachment prevention protrusion.
With this configuration, in addition to the operation of the first aspect , the following operation can be obtained.
(1) If there is insufficient locking of the locking claw part of the locking part body during assembly, the detachment prevention protrusion will protrude to the outside and the cover body cannot be properly fitted to the original fitting position. Since the worker can easily detect the lack of engagement between the proximal fixed tube and the rotating tube, the workability is excellent.
(2) By fitting the cover body to the locking part main body, even when the outward force is applied to the locking claw part when the rotary tube is pulled strongly in the pulling direction, the detachment prevention protruding part is Since it is regulated by the cover body wall, the locking claw portion does not come off from the locking annular protrusion, and the reliability of the degree of component coupling is excellent.
[0013]
Here, the shape of the detachment prevention protrusion is the same as that of the aforementioned locking claw. The contact surface of the locking claw portion with the locking annular protrusion is preferably formed so as to be convexly inclined with respect to the axial direction.
Further, the height of the detachment prevention protrusion is formed to be the same as or slightly lower than the cover body insertion flange. Thereby, the cover body can be easily inserted.
Invention of Claim 3 of this invention is a rotary joint for pipes of Claim 1 or 2, Comprising: The notch-shaped guide insertion part formed in the said cover body insertion flange, The said cover body And a guide portion formed in the shape of a ridge or a protrusion in the axial direction of the inner peripheral wall.
With this configuration, the following operation can be obtained in addition to the operation of the first or second aspect.
(1) When the guide part of the cover body is pushed into the guide rail part of the rotary tube and pushed, and the guide reinforcement part is fitted to the guide insertion part, the cover body insertion protrusion of the cover body is simultaneously inserted into the cover body. The cover body is firmly locked to the cover body insertion flange by being locked to the annular stepped portion of the mounting flange, and the cover body can be externally fitted to the rotary tube.
(2) When the guide reinforcing portion is formed integrally or discontinuously with the guide portion so as to be T-shaped, the rotating tube and the cover body do not rotate freely even if a rotational force is applied to the cover body. With the cover body fixed by hand, it can be screwed with the tightening tool screwed portion of the rotary tube and the lock nut, and the operability when the hose H is attached can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 or FIG.
(Embodiment 1)
FIG. 1 is a cross-sectional end view showing a state in which the pipe joint in Embodiment 1 is attached to a watering nozzle. In FIG. 1, 1 is a rotatable joint for pipes in Embodiment 1, and a base end fixed pipe 2 has a connecting means 3 connected to a watering nozzle at one end. Reference numeral 101 denotes a watering nozzle, which is formed of a nozzle body 102 formed in a pistol shape and a connecting means 103 having a female screw on the end of the nozzle body 102. 2 connecting means 3.
[0015]
Next, details of each part of the rotatable joint for pipe of the first embodiment will be described with reference to the drawings.
FIG. 2 is a cross-sectional view of the main part of the rotatable joint for pipes, FIG. 3A is a perspective view of the rotary pipe for the rotatable joint for pipes, FIG. 3B is a side view thereof, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 5 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 6 (a) is an exploded perspective view before assembly of the rotatable joint for pipes according to the first embodiment. FIG. 6 (b) is an exploded side view before the assembly of the pipe rotatable joint according to the first embodiment.
2 to 6, reference numeral 2 denotes a proximal fixed tube, which is formed of synthetic resin such as ABS, and is formed into a concentric, different-diameter cylindrical shape by a proximal cylindrical portion 2a, a central cylindrical portion 2b, and a distal cylindrical portion 2c. The connecting means 3 is formed, and the outer peripheral surface of the proximal end cylinder portion 2a is threaded. The proximal end fixed tube 2 is provided with a proximal end flange portion 4 and an annular rib 5 protruding in an annular shape perpendicular to the axial direction from the proximal end tubular portion 2a side on the outer peripheral surface of the central tubular portion 2b. A stop annular groove 6 is provided perpendicularly to the axial direction, and a locking annular protrusion 7 is provided with an appropriate angle of inclination on the distal end tubular portion 2c side and is provided in an annular form perpendicular to the axial direction. Yes. Further, an O-ring groove portion 8 is provided around the outer peripheral surface of the distal end cylindrical portion 2c so as to be perpendicular to the axial direction, and a watertight O-ring 9 is fitted into the O-ring groove portion 8. Note that the outer diameter D1 of the locking annular groove 6 is smaller than the outer diameter D2 of the distal end cylindrical portion 2c.
Reference numeral 10 denotes a rotating tube having an end portion inserted into one end of the base end fixed tube 2, which is formed of the above-described synthetic resin or the like and has a flange 11 at the end, and the tube portion is a cover body insertion flange. A concentric, different-diameter cylindrical shape is formed by a distal end tubular portion insertion portion 12a for inserting the distal end tubular portion 2c of the proximal end fixed tube 2 from the 13th side, a small diameter tubular portion 12b, and a hose fitting portion 12c to which the hose H is fitted. Is formed. The outer peripheral surface of the small diameter cylindrical portion 12b is extended, and a fitting recess 12d for fitting the tip of the hose H is opened to form a lock nut screwing portion 12e. A reinforcing rib 12f that reinforces the lock nut screwing portion 12e is formed on the bottom wall of the fitting recess 12d.
One side is connected to the flange 11 at two opposing positions between the cover body insertion flange 13 and the flange 11 formed on the outer periphery of the base portion of the tip tube portion insertion portion 12a, and is opened on the peripheral surface of the rotary tube 10. And a locking portion window 14. Window reinforcement ribs 14 a and 14 b are provided on the side portions of the locking portion window portion 14 so as to be connected to the flange 11 at the same height as the cover body insertion flange 13 to form a frame portion. A locking portion main body 15 is provided in the frame portion of the locking portion window portion 14 and has a base portion connected in a tongue-like shape on the inner edge side of the flange 11. At the end of the locking portion main body 15, an arcuate or rectangular shape is provided on the inner side and abuts against the peripheral wall on the locking annular groove 6 side of the locking annular protrusion 7 of the proximal fixed tube 2 to prevent it from coming off. A locking claw portion 15a that is locked in a shape and a disengagement prevention projection 15b that prevents the locking claw portion 15a from coming off the locking annular projection 7 are formed on the outside. The locking claw portion 15a has an inclined surface 15a 'formed by inclining the flange 11 side at an angle corresponding to the elastic modulus of the locking portion main body 15, and the contact surface 15a "on the cover body insertion flange 13 side. Guide rail ribs 17 are formed on the outer sides of the window reinforcing ribs 14b with the guide rail portion 16 interposed therebetween, and an outer peripheral surface between the cover body insertion flange 13 and the flange 11. A cover body holding rib 18 for holding a cover body, which will be described later, is provided on the same line as the detachment prevention protrusion 15b, and the height of the cover body holding rib 18 is the same as that of the cover body insertion flange 13. Also, the cover body holding rib 18 is provided in parallel with the cover body insertion flange 13. Both ends of the cover body holding rib 18 may be connected to the window reinforcing rib 14a and the guide rail rib 17 or separated from each other. Hippo at the end of The body insertion flange 13 is cut out to form a guide insertion portion 19. Further, the screw portion 12e 'of the lock nut screwing portion 12e allows a guide portion to be described later to be fitted on the extension line of the guide rail portion 16. Therefore, a guide fitting portion 20 that is notched is formed.
[0016]
On the inner peripheral wall of the cover body 21, a stepped portion 22 having a slightly larger diameter at one end on the proximal end fixed tube 2 side of the cover body 21 and a ridge or several protrusions in the axial direction from the peripheral end surface of the stepped portion 22 are formed. And a guide reinforcing portion 24 formed at the end of the guide portion 23 so as to be T-shaped at the same height as the guide portion 23. One or more cover body insertion protrusions 25 are provided on the inner peripheral wall on the other end side of the cover body 21 so as to be engaged with the annular stepped portion 13a of the rotary tube 10 at predetermined intervals from the guide portion 23 in the circumferential direction. . The flange 11 is formed to be slightly higher than the cover holding rib 18 and the like because the flange 11 is fitted to the stepped portion 22, and the end surface of the cover body 21 is substantially flush with the outer peripheral surface of the proximal flange portion 4 when the cover body 21 is externally fitted. It is formed to become. Thereby, the damage by the eccentric load of the base end fixed pipe 2 can be prevented.
The guide reinforcing portion 24 is formed integrally or discontinuously with the guide portion 23 so as to be T-shaped. As a result, even if a rotational force is applied to the cover body 21, the rotating tube 10 and the cover body 21 do not rotate freely. Therefore, the fastening member for the rotating tube 10 and a lock nut 27 described later with the cover body 21 fixed by hand. The screw 28 can be screwed together, and the operability when the hose H is attached can be improved. The cover body insertion protrusion 25 is in contact with an annular step portion 13a formed shallow on the outer peripheral side of the cover body insertion flange 13 in the thickness direction.
[0017]
A hose H is fitted on the hose fitting portion 12c. The outer peripheral surface of the hose H is tightened with a tightening tool 26. The tightening tool 26 is formed in a truncated cone shape, and a linear notch 26a is formed from one end side of the hose tip side, and a linear notch 26b is formed from the other end side so as to be stretchable. Further, a claw portion 26c is formed on the inner periphery on the other end side, and the claw portion 26c bites into the hose H to prevent the hose H from coming off.
The tightening tool 26 fits the lock nut 27 to the tightening tool 26 and screwes the tightening tool screw portion 28 of the lock nut 27 and the lock nut screw portion 12e so that the claw portion 26c bites into the hose H. Is formed.
In addition, reinforcing ribs 12g in the rotating tube are radially provided at equal intervals on the inner peripheral surface of the hose fitting portion 12c of the rotating tube 10 in parallel to the axial direction. Thereby, durability of the rotary tube 10 can be improved.
[0018]
The assembly method of the rotatable joint 1 for a pipe of the first embodiment configured as described above will be described below with reference to FIGS. FIG. 7 is a schematic view when the rotating tube is externally fitted to the proximal end fixed tube.
The O-ring 9 is fitted into the O-ring groove 8 of the base end fixed tube 2. Next, as shown in FIG. 7, when the rotary tube 10 is pushed inward from the distal end cylindrical portion 2 c side of the base end fixed tube 2, the locking claw portion 15 a is engaged with the locking annular protrusion 7 of the base end fixed tube 2. Touch the corner. Next, by pushing further inward, the engaging claw portion 15a is inclined with respect to the traveling direction, so that an outward force is applied to the engaging claw portion 15a, and as shown by the dotted line in FIG. The locking portion main body 15 warps outward and is pushed into the back. Next, as shown in FIG. 2, the locking claw 15 a is fitted into the locking annular groove 6, and the contact surface 15 a ″ is the locking annular groove of the locking annular protrusion 7. locked to the 6 side wall in contact with the stopper-like. after being stopped once, to the the force pulling the direction pulling out the rotary tube 10, resilient locking by the elastic force of the engaging body 15 The claw portion 15a enters the back of the locking annular groove portion 6 and the contact surface 15a ″ contacts widely, whereby the rotary tube 10 can be firmly locked to the proximal end fixed tube 2. Further, the rotating tube 10 can freely rotate because the contact surface 15a "of the locking claw portion 15a can slide in the direction around the axis of the proximal fixed tube 2.
Next, when the guide portion 23 of the cover body 21 shown in FIG. 6 is pushed together with the guide rail portion 16 of the rotary tube 10 and the guide reinforcing portion 24 is fitted into the guide insertion portion 19, As shown in FIG. 2, the cover body insertion protrusion 25 is locked to the annular step portion 13a of the cover body insertion flange 13, whereby the cover body 21 is firmly locked to the cover body insertion flange 13, and the cover The body 21 can be fitted on the rotary tube 10. At this time, the step portion 22 of the cover body 21 is fitted to the flange 11 of the rotary tube 10. As a result, against the pulling force in the direction of pulling out the rotary tube 10, the locking claw 15 a is bent by the elastic force of the locking body 15 and the locking claw 15 a enters the back of the locking annular groove 6 and the contact surface 15 a ″ is widely applied. Accordingly, the rotary tube 10 can be firmly locked to the proximal end fixed tube 2. When a force is applied to pull the rotary tube 10 in the direction in which the rotary tube 10 is pulled out, the locking claw portion 15a is engaged. Although the locking portion main body 15 bends in the direction away from the locking annular groove 6, the locking prevention projection 15 b comes into contact with the cover body 21 to prevent the locking claw 15 a from being disconnected from the locking annular projection 7. Therefore, it is possible to prevent the rotary tube 10 from being detached from the base end fixed tube 2. Further, since the disengagement preventing projection 15b is provided, the latching claw portion 15a is formed into a ring for locking at the assembly stage. When there is insufficient locking to the groove 6, the disengagement prevention projection 15 b is originally fitted. Not reach the location, the cover member 21 is assembled subsequently it is because it is possible to discern the locking shortage of the locking pawl 15a from the inability fitted, excellent workability.
Next, as shown in FIG. 2, after the lock nut 27 and the fastener 26 are externally fitted to the hose H in this order, the hose H is externally fitted to the hose fitting portion 12 c of the rotary tube 10, and then the fastener 26 is attached to the hose H The lock nut 27 is screwed onto the lock nut screwing portion 12e and the fastener 26 is fastened to the outer peripheral surface of the hose H. Thereby, it can prevent that the nail | claw part 26c of the fastener 26 bites into the hose H, and the hose H comes off.
[0019]
As described above, since the rotatable joint for pipes in the first embodiment is configured, the following operation can be obtained.
(1) Since the locking portion main body, the locking claw portion, and the rotary tube are integrally formed, the number of parts can be reduced without requiring additional locking means as in the prior art.
(2) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is not necessary to separately incorporate the locking means as in the prior art, and the manufacturing and mounting man-hours can be reduced. .
(3) By simply inserting the rotating tube into the base end fixed tube, the locking claw portion is loosely fitted into the locking annular groove due to the elasticity of the locking portion body, so that the assembly workability is remarkably improved. Can be made.
(4) Since the locking portion main body is continuously provided on the flange, and further, the window reinforcing ribs constituting the frame portion of the locking portion window portion are continuously provided on both sides of the locking portion main body. The strength of the main body can be increased.
(5) Since the locking portion main body is formed inside the locking portion window portion, it is possible to prevent accidents that may occur during manufacture and assembly.
(6) By externally fitting the cover body to the locking portion main body, it is possible to prevent and protect the locking portion main body from being loaded from the outside.
(7) By locking the cover body insertion protrusion to the cover body insertion flange, the locking body can be protected by the cover body and the cover body can be prevented from falling off.
(8) When there is insufficient locking of the locking claw part of the locking part main body during assembly, the detachment prevention protrusion protrudes outward and the cover body cannot be properly fitted to the original fitting position. Since the worker can easily detect the lack of engagement between the proximal fixed tube and the rotating tube, the workability is excellent.
(9) By fitting the cover body to the locking part main body, even when the outward force is applied to the locking claw part when the rotary tube is pulled strongly in the pulling direction, the detachment prevention protruding part is Since it is regulated by the cover body wall, the locking claw portion does not come off from the locking annular protrusion, and the reliability of the degree of component coupling is excellent.
(10) Since the rotary tube is rotatable, twisting does not occur when a hose or the like is connected, and the workability is excellent.
(11) Since it is possible to rotate the rotating tube at the same time as rotating the cover body when it is desired to rotate in an arbitrary direction, it is excellent in convenience.
[0020]
【The invention's effect】
As described above, according to the invention described in claim 1, the tube-use rotatable joint of the present invention has the following advantageous effects.
(1) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is possible to reduce the number of parts without requiring additional locking means as in the prior art, and for pipes with excellent resource saving. A rotatable joint can be provided.
(2) Since the locking part main body, the locking claw part, and the rotating tube are integrally formed, it is possible to reduce the manufacturing and mounting man-hours without requiring a separate work for assembling the locking means as in the prior art. In addition, it is possible to provide a rotatable joint for pipes with excellent workability.
(3) Since the locking claw is not loosely fitted and locked in the locking annular groove due to the elasticity of the locking body simply by inserting the rotating tube into the base end fixed tube, workability during assembly It is possible to provide a rotatable joint for pipes excellent in the above.
(4) Since the locking part main body is formed inside the locking part window part, it is possible to prevent accidents that may be caught at the time of manufacture and assembly. Therefore, a pipe joint with excellent workability and durability is provided. Can be provided.
(5) Since the cover body can be externally fitted to the locking portion body to prevent and protect the locking portion body from being loaded from the outside, it is possible to provide a rotatable joint for pipes having excellent durability. it can.
(6) By locking the cover body insertion protrusion to the cover body insertion flange, it is possible to protect the locking portion main body with the cover body and prevent the cover body from falling off. A rotatable joint for a tube can be provided.
[0023]
According to the invention described in claim 2 , in addition to the effect described in claim 1 , the following advantageous effects can be obtained.
(1) If there is insufficient locking of the locking claw part of the locking part body during assembly, the detachment prevention protrusion will protrude to the outside and the cover body cannot be properly fitted to the original fitting position. An operator can easily detect the lack of engagement between the proximal fixed tube and the rotating tube, and can provide a rotatable joint for a tube having excellent workability.
(2) By fitting the cover body to the locking part main body, even when the outward force is applied to the locking claw part when the rotary tube is pulled strongly in the pulling direction, the detachment prevention protruding part is Since it is regulated by the cover body wall, the locking claw portion does not come off from the locking annular protrusion, and it is possible to provide a rotatable joint for pipes with excellent reliability of component coupling.
According to invention of Claim 3, in addition to the effect of Claim 1 or 2, the following advantageous effects are acquired.
(1) When the guide part of the cover body is pushed into the guide rail part of the rotary tube and pushed, and the guide reinforcement part is fitted to the guide insertion part, the cover body insertion protrusion of the cover body is simultaneously inserted into the cover body. The cover body is firmly locked to the cover body insertion flange by being locked to the annular stepped portion of the mounting flange, and the cover body can be externally fitted to the rotary tube.
(2) When the guide reinforcing portion is formed integrally or discontinuously with the guide portion so as to be T-shaped, the rotating tube and the cover body do not rotate freely even if a rotational force is applied to the cover body. With the cover body fixed by hand, it can be screwed with the tightening tool screwed portion of the rotary tube and the lock nut, and the operability when the hose H is attached can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional end view showing a state in which a pipe rotatable joint according to Embodiment 1 is attached to a water spray nozzle. FIG. 2 is a cross-sectional view of a main part of a pipe rotatable joint. FIG. 4 is a side view of a rotary tube of a rotatable joint for a pipe. FIG. 4 is a cross-sectional view taken along line BB in FIG. 2. FIG. 5 is a cross-sectional view taken along line CC in FIG. (A) Exploded perspective view before assembling of the pipe rotatable joint according to Embodiment 1 (b) Exploded side view before assembling of the pipe rotatable joint according to Embodiment 1 [FIG. 7] FIG. Schematic diagram for external fitting 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 1 Rotating joint 2 for pipe | tubes in Embodiment 1 Base end fixed pipe 2a Base end cylinder part 2b Central cylinder part 2c Front end cylinder part 3 Connection means 4 Base end flange part 5 Annular rib 6 Annular groove part 7 Engagement ring Projection 8 O-ring groove 9 O-ring 10 Rotating tube 11 Flange 12a Tip tube portion insertion portion 12b Small diameter tube portion 12c Hose fitting portion 12d Fitting recess 12e Lock nut screwing portion 12e 'Screw portion 12f Reinforcement rib 12g Rotating tube reinforcing rib 13 Cover body insertion flange 13a Annular stepped portion 14 Locking portion window portions 14a, 14b Window reinforcing rib 15 Locking portion main body 15a Locking claw portion 15b Disengagement preventing projection 15a 'Inclined surface 15a " Contact surface 16 Guide rail portion 17 Guide rail rib 18 Cover body holding rib 19 Guide insertion portion 20 Guide fitting portion 21 Cover body 22 Step portion 23 Guide portion 24 Guide reinforcement 25 Cover body insertion protrusion 26 Fasteners 26a, 26b Linear cutout portion 26c Claw 27 Lock nut 28 Fastener screwing portion 101 Water spray nozzle 102 Nozzle body 103 Connecting means H Hose D1 Outer diameter of locking annular groove D2 Outer diameter of the tip tube

Claims

A proximal fixed tube formed in a substantially cylindrical shape and having an annular groove for locking on an outer peripheral surface; a rotary tube formed in a generally cylindrical shape having a flange at one end and fitted on the proximal fixed tube; and the rotation A locking portion window formed on the peripheral surface of the tube, a locking portion main body formed in a tongue shape inside the locking portion window portion , and protruding from the inside of the distal end of the locking portion main body A locking claw portion that is locked to the locking annular groove portion in a retaining manner, a cover body insertion flange that is connected to the locking portion window portion on the outer peripheral side of the rotary tube, and a substantially cylindrical shape. A cover body insertion projection that is formed in a shape and is engaged with the cover body insertion flange, and a cover body that is externally fitted to the engagement portion main body. A rotatable joint for pipes.

The locking part main body protrudes outside the locking part main body, and the cross-sectional shape is triangular, trapezoidal, one side is vertical, trapezoidal, square, semicircular, or arcuate. The rotatable joint for pipes according to claim 1 , further comprising a detachment preventing protrusion.

A notch-shaped guide insertion portion formed in the cover body insertion flange, and a guide portion formed in a ridge shape or a protrusion shape in the axial direction of the inner peripheral wall of the cover body, The rotatable joint for pipes according to claim 1 or 2.