JP4982202B2

JP4982202B2 - Pipe fitting

Info

Publication number: JP4982202B2
Application number: JP2007024343A
Authority: JP
Inventors: 崇明猪谷; 明夫永見; 孝正野村; 義郎岡崎
Original assignee: Hitachi Metals Ltd; JFE Pipe Fitting Mfg Co Ltd
Current assignee: Hitachi Metals Ltd; JFE Pipe Fitting Mfg Co Ltd
Priority date: 2007-02-02
Filing date: 2007-02-02
Publication date: 2012-07-25
Anticipated expiration: 2027-02-02
Also published as: JP2008190590A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint having improved constructing efficiency and reliability for allowing easy visual check of the inserted condition of a connected pipe without the need for marking work for an allowance of insertion into the connected pipe while simply inserting the connected pipe in a sealed and nonslip condition with a single operation. <P>SOLUTION: In a joint body 2 having a socket portion 12, there are stored and arranged a nonslip member 3 which is engaged with the outer peripheral face of the connected pipe 11, and a first seal ring 5 which has close contact with the outer peripheral face of the connected pipe 11, in sequence from the socket portion 12 to the inside corner of the joint body. A check hole 18 is provided in a penetration fashion at at least one position on the circumference of the joint body 2 corresponding to the inside corner of the joint body beyond the first seal ring 5. On an inner diameter portion of the first seal ring 5, a damage preventing sleeve 7 is arranged which can be externally fitted to the terminal end of the connected pipe 11. The damage preventing sleeve 7 is pushed into the inside position of the check hole 18 at the terminal end of the connected pipe with the insertion of the connected pipe 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、給水又は給湯用ステンレス鋼管などの配管をワンタッチで接続するために使用される管継手に関する。 The present invention relates to a pipe joint used for connecting a pipe such as a stainless steel pipe for water supply or hot water supply with one touch.

この種のワンタッチ方式の管継手として、例えば、図１７に示すように、基体（継手本体）３０の大径部の内面に設けられた２条の周溝にＯリング３１を嵌め込み、大径部の縁端にコイルバネ３２と、内側面に直角エッジ３３aを有する押圧部材３３が嵌め込まれた合成樹脂製の内カラー３４とが配置され、これらをテーパ付外カラー（押輪）３５で覆うようにしたものがある（特許文献１参照。）。この管継手によれば、内カラー３４の先端より接続管３６が挿入されると、押圧部材３３が内カラー３４の先端側に押されるが、押圧部材３３の外側面が外カラー３５のテーパ面３５aで押圧されて内側面の直角エッジ３３aが接続管３６に食い込むことにより、これら管継手と接続管３６との結合が保持される。この結合状態で接続管３６に引き抜き力が作用すると、押圧部材３３はコイルバネ３２の弾発力により外カラー３５のテーパ面３５a側に押し付けられると共に、そのテーパ面３５aによって押圧部材３３の直角エッジ３３ａが接続管３６を押圧することにより、接続管３６の引き抜きが阻止されるというものである。 As this type of one-touch type pipe joint, for example, as shown in FIG. 17, an O-ring 31 is fitted into two circumferential grooves provided on the inner surface of the large-diameter portion of the base body (joint body) 30. A coil spring 32 and an inner collar 34 made of a synthetic resin into which a pressing member 33 having a right-angled edge 33a is fitted on the inner surface are arranged at the edge of the inner surface, and these are covered with a tapered outer collar (push wheel) 35. There is a thing (refer patent document 1). According to this pipe joint, when the connection pipe 36 is inserted from the front end of the inner collar 34, the pressing member 33 is pressed toward the front end side of the inner collar 34, but the outer surface of the pressing member 33 is the tapered surface of the outer collar 35. The connection between the pipe joint and the connection pipe 36 is maintained by the right-angled edge 33a on the inner surface biting into the connection pipe 36 by being pressed by 35a. When a pulling force acts on the connecting pipe 36 in this coupled state, the pressing member 33 is pressed against the tapered surface 35a side of the outer collar 35 by the elastic force of the coil spring 32, and the tapered edge 35a of the pressing member 33 is pressed by the tapered surface 35a. When the connection pipe 36 is pressed, the connection pipe 36 is prevented from being pulled out.

特開平１０−１２２４６０号公報（図１７）Japanese Patent Laid-Open No. 10-122460 (FIG. 17)

しかるに、上記従来の管継手では、継手本体３０に接続管３６を挿入後、接続管を正常長さにまで挿入できたか否かを容易に確認することができず、挿入不足の場合漏水の原因になる。そのためには、一般に、接続管３６を継手本体３０に挿入する前に、施工者が接続管３６に差し込み代をマジックインキ等でマーキングし、挿入後、差し込み代のマーキングの位置まで差し込んだことを確認するという方法が採用されるが、現場で接続管３６に差し込み代をマーキングする作業は甚だ煩わしかった。また、作業者がマーキングすることを忘れてしまうという問題もあった。 However, in the above-described conventional pipe joint, it is not possible to easily confirm whether or not the connection pipe has been inserted to a normal length after the connection pipe 36 is inserted into the joint body 30. become. For this purpose, in general, before inserting the connecting pipe 36 into the joint body 30, the operator marks the connecting pipe 36 with the insertion allowance with magic ink or the like, and after insertion, inserts the insertion allowance to the marking position. Although the method of confirming is adopted, the work of marking the insertion allowance on the connection pipe 36 at the site is extremely troublesome. There is also a problem that the operator forgets to mark.

また、接続管３６を挿入するとき該接続管３６の端部にバリが発生していると、該端部でＯリング３１を傷付け、Ｏリング３１によるシール機能に悪影響を及ぼす。このため、接続管３６の切断後、その切断端面に発生しているバリを除去する面取り等の加工が必要であった。またバリが発生しない接続管３６の切断方法にはロータリカッター等が挙げられるが、このような切断方法に限定されるとの制限があった。 Further, if a burr is generated at the end of the connection pipe 36 when the connection pipe 36 is inserted, the O-ring 31 is damaged at the end, and the sealing function by the O-ring 31 is adversely affected. For this reason, after the connection pipe 36 is cut, processing such as chamfering for removing burrs generated on the cut end face is necessary. Moreover, although the cutting method of the connection pipe 36 which does not generate | occur | produce a burr | flash, a rotary cutter etc. are mentioned, There existed a restriction | limiting that it was limited to such a cutting method.

本発明は、このような問題点を解消するためになされたものであり、その目的とするところは、接続管を挿入するだけのワンタッチでシール状にかつ抜止め状に接続できるうえ、接続管への差し込み代のマーキング作業を省け、接続管の挿入状態を人目で容易に確認でき、施工性、信頼性に優れる管継手を提供することにある。また、本発明の他の目的は、接続管の切断方法に制限をなくし、また切断方法によっては切断端面、特に接続管端部外周にバリを発生させる場合があるが、そのバリを取り除くことを怠った場合でも接続管挿入時にシールリングを傷付けることなく施工でき、施工性に優れる管継手を提供することにある。 The present invention has been made to solve such problems, and the object of the present invention is to connect in a seal-like and retaining shape with a single touch just by inserting the connecting tube. The purpose of this invention is to provide a pipe joint that eliminates the marking work of the insertion allowance and can easily confirm the insertion state of the connecting pipe with human eyes, and has excellent workability and reliability. Another object of the present invention is to remove the burr on the cut end face, particularly the outer periphery of the end of the connection pipe, depending on the cutting method. The object is to provide a pipe joint that can be constructed without damaging the seal ring when the connecting pipe is inserted even if it is neglected and is excellent in workability.

上記目的を達成するために、本発明の管継手は、請求項１に記載のように、接続管の端部を受け入れる受口部を有する継手本体内に、前記受口部から継手本体内奥に向かって順に、前記接続管の外周面に係合される抜止部材と、前記接続管の外周面に密着する第１のシールリングとを収容配置しており、前記第１のシールリングより継手本体内奥側に対応する前記継手本体の円周上の少なくとも１箇所には確認孔を内外貫通状に設けており、前記第１のシールリングの内径部に、前記接続管の端部に外嵌可能な傷付き防止スリーブが配置され、この傷付き防止スリーブは、前記接続管の挿入に伴い該接続管の末端で前記確認孔の内側位置にまで押し込まれるようにしてあり、前記傷付き防止スリーブは、内径が前記接続管の内径と略同一径に形成されたシールリング保持筒部と、このシールリング保持筒部の後端側に一体に連設され、内径が前記接続管の外径よりも大きく形成されて前記接続管の端部に外嵌可能な接続管端部受け筒部とを有する形に形成されており、前記シールリング保持筒部の外周に、自由状態の前記第１のシールリングの内径部が嵌まり込む凹溝を形成していることに特徴を有するものである。 In order to achieve the above object, a pipe joint according to the present invention includes, as described in claim 1, a joint body having a receiving part for receiving an end part of a connecting pipe, and the inside of the joint body from the receiving part. In order, the retaining member engaged with the outer peripheral surface of the connection pipe and the first seal ring that is in close contact with the outer peripheral surface of the connection pipe are accommodated and arranged in order from the first seal ring. A confirmation hole is provided in at least one place on the circumference of the joint main body corresponding to the inner side of the main body so as to penetrate inside and outside, and is provided on the inner diameter portion of the first seal ring and on the end portion of the connection pipe. is scratch resistant sleeve disposed possible fit, the scratch preventing sleeve, Ri Citea as pressed to a position inside of the end in the confirmation hole of the connecting pipe with the insertion of the connection pipe, with the flaw The prevention sleeve has an inner diameter that is substantially the same as the inner diameter of the connecting pipe. The seal ring holding cylinder portion formed and integrally connected to the rear end side of the seal ring holding cylinder portion, and the inner diameter is formed larger than the outer diameter of the connection pipe, and the outer fitting is performed on the end of the connection pipe. And a concave groove into which the inner diameter part of the first seal ring in a free state is fitted is formed on the outer periphery of the seal ring holding cylinder part. Tei is Rukoto those characterized by.

このような構成によれば、継手本体への接続管の挿入途中および完全に挿入した後において確認孔から傷付き防止スリーブを目視で容易に確認できるため、接続管の挿入不足を未然に防止でき、接続管への差し込み代のマーキング作業を省略することができる。
また、このように傷付き防止スリーブを継手本体の内部に収容する構成によれば、接続管を切断する際、その切断端面に多少のバリが発生してもそれを除去する加工を怠っても、接続管の挿入時に該接続管の端部のバリ等で第１のシールリングを傷付けることなく施工できる。したがって、接続管の切断方法に制限がなくその切断施工の自由度が得られる。 According to such a configuration, the damage prevention sleeve can be easily visually confirmed from the confirmation hole during and after the connection pipe is completely inserted into the joint body, so that insufficient insertion of the connection pipe can be prevented in advance. The marking work for inserting into the connecting pipe can be omitted.
In addition, according to the configuration in which the scratch-preventing sleeve is accommodated in the joint body in this way, when cutting the connecting pipe, even if some burr is generated on the cut end surface, the processing for removing it is neglected. When inserting the connecting pipe, it can be constructed without damaging the first seal ring with a burr or the like at the end of the connecting pipe. Therefore, there is no restriction on the method of cutting the connecting pipe, and the degree of freedom of the cutting work can be obtained.

接続管を挿入する前、すなわち在庫、保管時に第１のシールリングには内部応力が発生せず、第１のシールリングは接続管が挿入されたときにはじめて弾性的に拡径して接続管の外周に密着するので、適切な圧縮代が長期間にわたり維持され、所定の耐用年数を保証することができる。 Before inserting the connection tube, i.e. inventory, internal stress is not generated in the first seal ring during storage, the first seal ring and first elastically expanded when the connection pipe is inserted and connected Since it adheres to the outer periphery of the tube, an appropriate compression allowance is maintained over a long period of time, and a predetermined service life can be guaranteed.

請求項１に記載の管継手は、請求項２に記載のように、前記継手本体内の前記第１のシールリングより継手本体内奥側であって前記確認孔の内側の位置に、前記接続管の端部の外周を覆う透視筒体を収容配置し、前記透視筒体の外周と前記継手本体の内周との間であって前記確認孔よりも継手本体内奥側の位置に第２のシールリングを、前記確認孔よりも受口部側の位置に第３のシールリングをそれぞれ介在配置することができる。
このような構成によれば、確認孔は透視筒体と、この透視筒体の外周面と継手本体の内周面との間に介在配置した第２，３のシールリングとにより密封シールされ、接続管が完全に挿入されると接続管の外周面と継手本体の内周面とが第１のシールリングにより確実に密封シールされることと相俟って、内部流体の漏洩を防止できる。 The pipe joint according to claim 1, as described in claim 2 , wherein the connection is provided at a position on the inner side of the confirmation hole that is deeper in the joint body than the first seal ring in the joint body. A fluoroscopic cylinder that covers the outer periphery of the end of the tube is accommodated and disposed between the outer periphery of the fluoroscopic cylinder and the inner periphery of the joint body, and is located at a position deeper in the joint body than the confirmation hole. The third seal ring can be interposed and disposed at a position closer to the receiving portion than the confirmation hole.
According to such a configuration, the confirmation hole is hermetically sealed by the fluoroscopic cylinder and the second and third seal rings disposed between the outer peripheral surface of the fluoroscopic cylinder and the inner peripheral surface of the joint body, When the connecting pipe is completely inserted, the outer peripheral surface of the connecting pipe and the inner peripheral surface of the joint body are surely hermetically sealed by the first seal ring, thereby preventing leakage of internal fluid.

請求項１に記載の管継手は、請求項３に記載のように、前記継手本体内の前記第１のシールリングと前記抜止部材との間に、前記抜止部材を受口部の内周に向かって押圧付勢する弾性部材を収容配置し、前記受口部の内周に、前記抜止部材の当接により該抜止部材に径方向内方への移動作用を加えるテーパ面を受口部外方に向かって窄まり状に形成することができる。
このような構成によれば、接続管が完全に挿入されると、抜止部材は弾性部材により受口部のテーパ面に押し付けられると共に、そのテーパ面によって抜止部材が縮径して接続管の外周面に係合されることにより、接続管の抜止め状態が得られる。
また、接続管の挿入後、接続管に引き抜き力が加えられると、接続管と同行する抜止部材が受口部のテーパ面と当接することにより、抜止部材が径方向内方へ移動して、接続管の外周面への係合力が増す。これにより接続管の抜け出しが確実に阻止される。 In the pipe joint according to claim 1, as described in claim 3 , the retaining member is disposed between the first seal ring in the joint body and the retaining member at the inner periphery of the receiving portion. An elastic member that presses and urges toward the housing is accommodated, and a taper surface that adds a radially inward moving action to the retaining member by contact of the retaining member is provided on the inner periphery of the receiving portion. It can be formed in a narrowed shape toward the direction.
According to such a configuration, when the connecting pipe is completely inserted, the retaining member is pressed against the tapered surface of the receiving portion by the elastic member, and the retaining member is reduced in diameter by the tapered surface and the outer periphery of the connecting tube. By being engaged with the surface, the connection pipe is prevented from being pulled out.
In addition, when a pulling force is applied to the connecting pipe after the connecting pipe is inserted, the retaining member that accompanies the connecting pipe comes into contact with the tapered surface of the receiving portion, so that the retaining member moves radially inward, Engagement force to the outer peripheral surface of the connecting pipe is increased. This reliably prevents the connecting pipe from coming out.

本発明の管継手によれば、接続管を挿入するだけのいわゆるワンタッチ操作でシール状にかつ抜止め状に接続でき、しかも接続管への差し込み代のマーキング作業を省け、接続管の挿入状態を人目で容易に確認でき、施工性、信頼性に優れる。また、接続管の切断方法に制限をなくし、また切断方法によっては切断端面、特に接続管端部外周にバリを発生させる場合があるが、そのバリを取り除くことを怠った場合でも接続管挿入時にシールリングを傷付けることなく施工でき、施工性に優れる。 According to the pipe joint of the present invention, it can be connected in a seal-like and retaining shape by a so-called one-touch operation by simply inserting the connecting pipe, and the marking operation of the insertion allowance to the connecting pipe can be omitted, and the insertion state of the connecting pipe can be reduced. It can be easily confirmed by the human eye and is excellent in workability and reliability. In addition, there are no restrictions on the method of cutting the connecting pipe, and depending on the cutting method, burrs may be generated on the cut end face, especially the outer periphery of the connecting pipe end. It can be installed without damaging the seal ring and has excellent workability.

図１は本発明の一実施例を示す管継手の斜視図、図２は接続管の挿入完了後の状態を示す同管継手の半欠截断面図、図３は接続管を挿入する前の状態を示す同管継手の半欠截断面図、図４は接続管の挿入途中の状態を示す同管継手の欠截断面図、図５は接続管を更なる挿入途中の状態を示す同管継手の半欠截断面図、図６は同管継手の傷付き防止スリーブの半欠截断面図、図７は同管継手のカラーの平面図、図８は同カラーの正面図、図９は同カラーの断面図である。 FIG. 1 is a perspective view of a pipe joint showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the pipe joint after the insertion of the connection pipe is completed, and FIG. 3 is a view before the connection pipe is inserted. FIG. 4 is a partially cutaway sectional view of the pipe joint showing a state in the middle of insertion of the connection pipe, and FIG. 5 is a same pipe showing a state in the middle of further insertion of the connection pipe. FIG. 6 is a cross-sectional view of the joint joint with a flaw prevention sleeve, FIG. 7 is a plan view of the collar of the joint, FIG. 8 is a front view of the collar, and FIG. It is sectional drawing of the same color.

図１、図２に示すように、管継手１は、両端部が開口した筒形状を有する継手本体２と、この継手本体２の内部に収容配置される抜止部材３と、弾性部材４と、第１のシールリング５と、透視筒体６と、傷付き防止スリーブ７等を備えている。 As shown in FIGS. 1 and 2, the pipe joint 1 includes a joint body 2 having a cylindrical shape with both ends opened, a retaining member 3 accommodated and disposed in the joint body 2, an elastic member 4, A first seal ring 5, a see-through cylinder 6, a scratch prevention sleeve 7, and the like are provided.

継手本体２は、軸方向中央付近に段部８を設け、この段部８をはさんで一側に大径部９を、他側に小径の流路１０を形成し、大径部９の開口端部、すなわち継手本体２の軸方向一端部に接続管１１の端部が挿入される受口部１２を形成し、他端部の外周に接続用雄ねじＳを形成している。受口部１２の内周には受口部外方に向かって窄まり状のテーパ面１３と、テーパ面１３の受口部外方側端に円周溝１４を形成している。 The joint body 2 is provided with a step portion 8 near the center in the axial direction, a large diameter portion 9 is formed on one side across the step portion 8, and a small diameter channel 10 is formed on the other side. The receiving end portion 12 into which the end portion of the connecting pipe 11 is inserted is formed at the opening end portion, that is, one axial end portion of the joint body 2, and the connecting male screw S is formed at the outer periphery of the other end portion. On the inner periphery of the receiving portion 12, a tapered surface 13 that is narrowed toward the outside of the receiving portion, and a circumferential groove 14 is formed on the outer end of the receiving portion of the tapered surface 13.

受口部１２の内部には、テーパ面１３に内接する抜止部材３と、この抜止部材３を保持するカラー１５と、抜止部材３をカラー１５ごとテーパ面１３に向かって押圧付勢する弾性部材４とが配置されている。継手本体２の円周溝１４にはストッパーリング１６が嵌合されてその内径部でカラー１５が受口部外方へ抜け出るのを防止している。
弾性部材４は圧縮コイルばね等からなり、この弾性部材４の外端部はカラー１５の後端の段部１５ａに係合し、同弾性部材４の内端部は第１のシールリング５に隣接する断面Ｌ形の環状のスペーサー１７に係合している。 Inside the receiving portion 12, a retaining member 3 inscribed in the tapered surface 13, a collar 15 that holds the retaining member 3, and an elastic member that presses and urges the retaining member 3 together with the collar 15 toward the tapered surface 13. 4 are arranged. A stopper ring 16 is fitted in the circumferential groove 14 of the joint body 2 to prevent the collar 15 from coming out of the receiving portion at the inner diameter portion thereof.
The elastic member 4 is composed of a compression coil spring or the like. The outer end portion of the elastic member 4 is engaged with a step portion 15 a at the rear end of the collar 15, and the inner end portion of the elastic member 4 is connected to the first seal ring 5. It engages with an adjacent annular spacer 17 having an L-shaped cross section.

透視筒体６は、接続管１１の外径よりも大きい内径を有する形に形成し、継手本体２内の段部８と第１のシールリング５との間に収容配置する。そして、第１のシールリング５より継手本体内奥側に対応し且つ透視筒体６の外周に対応する継手本体２の円周上の少なくとも１箇所には確認孔１８を内外貫通状に設ける。透視筒体６の外周と継手本体２の内周との間であって確認孔１８よりも継手本体内奥側の位置に第２のシールリング１９を、確認孔１８よりも受口部１２側の位置に第３のシールリング２０をそれぞれ介在配置している。第２，３のシールリング１９，２０は継手本体２の内周面に確認孔１８をはさんで設けたシールリング溝２１，２２にそれぞれ各内径部が突出するように嵌め込まれている。これにより継手本体２内を流れる水等流体が透視筒体６の外周と継手本体２の内周との間から確認孔１８に漏れ出ることのないように密封シールされる。 The see-through cylinder 6 is formed in a shape having an inner diameter larger than the outer diameter of the connection pipe 11, and is accommodated and disposed between the step portion 8 in the joint body 2 and the first seal ring 5. Then, a confirmation hole 18 is provided in an inner and outer penetrating manner in at least one place on the circumference of the joint body 2 corresponding to the inner side of the joint body from the first seal ring 5 and corresponding to the outer periphery of the see-through cylinder 6. The second seal ring 19 is provided between the outer periphery of the see-through cylinder 6 and the inner periphery of the joint body 2 and at a position deeper in the joint body than the confirmation hole 18, and the receiving portion 12 side of the confirmation hole 18. The third seal rings 20 are interposed at the positions. The second and third seal rings 19 and 20 are fitted in seal ring grooves 21 and 22 provided with a confirmation hole 18 on the inner peripheral surface of the joint body 2 so that each inner diameter portion protrudes. Thereby, a fluid such as water flowing in the joint body 2 is hermetically sealed so as not to leak into the confirmation hole 18 from between the outer periphery of the see-through cylinder 6 and the inner periphery of the joint body 2.

傷付き防止スリーブ７は、図２、図６に示すように、内径が接続管１１の内径と略同一径に、外径が透視筒体６の内径よりも小さく形成されたシールリング保持筒部７ａと、このシールリング保持筒部７ａの後端側に一体に連設され、内径が接続管１１の外径よりも大きく、外径が透視筒体６の内径よりも小さく形成されて接続管１１の端部の末端に外嵌可能な薄肉の接続管端部受け筒部７ｂとを有する形に形成されている。シールリング保持筒部７ａの内周面と接続管端部受け筒部７ｂの内周面との間には、接続管１１の端部の端面が当接する段部２３を形成している。シールリング保持筒部７ａの外周には、自由状態の第１のシールリング５の内径部が嵌まり込む凹溝２４を形成している。接続管端部受け筒部７ｂの後端部７ｃは後方へ漸次拡径するラッパ状に形成し、これにより接続管１１の挿入時に該接続管１１の端部が接続管端部受け筒部７ｂの後端部７ｃに引っ掛かることなくスムーズに挿入できるようになしている。シールリング保持筒部７ａの先端部外周にはアール又は先窄まりテーパｃを付けて、透視筒体６内に挿入し易くしている。 As shown in FIGS. 2 and 6, the scratch-preventing sleeve 7 has a seal ring holding cylinder portion whose inner diameter is substantially the same as the inner diameter of the connecting pipe 11 and whose outer diameter is smaller than the inner diameter of the see-through cylinder 6. 7a and the seal ring holding cylinder portion 7a are integrally connected to the rear end side, and the inner diameter is larger than the outer diameter of the connecting pipe 11, and the outer diameter is smaller than the inner diameter of the see-through cylindrical body 6. 11 is formed in a shape having a thin connecting pipe end receiving tube portion 7b that can be fitted to the end of the end portion. Between the inner peripheral surface of the seal ring holding cylinder part 7a and the inner peripheral surface of the connection pipe end receiving cylinder part 7b, a step part 23 is formed, on which the end face of the end part of the connection pipe 11 abuts. On the outer periphery of the seal ring holding cylinder portion 7a, a concave groove 24 into which the inner diameter portion of the first seal ring 5 in a free state is fitted is formed. The rear end portion 7c of the connecting pipe end receiving tube portion 7b is formed in a trumpet shape that gradually increases in diameter rearward, so that the end portion of the connecting tube 11 is connected to the connecting tube end receiving tube portion 7b when the connecting tube 11 is inserted. The rear end 7c can be smoothly inserted without being caught. The outer periphery of the distal end of the seal ring holding cylinder 7a is rounded or tapered to make it easy to insert into the see-through cylinder 6.

カラー１５は、図２、図７〜９に示すように、複数個の保持穴１５ｂを円周方向に所定間隔置きに有し、各保持穴１５ｂに抜止部材３が嵌着されている。各抜止部材３の内面側には複数（図例では２個）の係合歯３ａを形成している。 As shown in FIGS. 2 and 7 to 9, the collar 15 has a plurality of holding holes 15 b at predetermined intervals in the circumferential direction, and the retaining member 3 is fitted into each holding hole 15 b. A plurality (two in the illustrated example) of engaging teeth 3 a are formed on the inner surface side of each retaining member 3.

管継手１を構成する上記各部材は例えば次の材料で形成することができる。継手本体２は、耐食性及び剛性を必要とするので、例えばＳＣＳ材や青銅材により精密鋳造の手法等により製造することができる。第１のシールリング５、第２，３のシールリング１９，２０は、オレフィン系ゴム製のＯリングで形成することができ、特に耐塩素、耐熱性に優れたエチレンとプロピレン及び架橋用ジエンモノマーとの３元共重合体であるＥＰＤＭで形成することが好ましく、また耐熱性とともに耐薬品性にも優れたＦＫＭ（フッ素ゴム）などで形成することもできる。透視筒体６は透明もしくは半透明のＰＰＳＵ（ポリフェニルサルフォン）やＰＥＩ（ポリエーテルイミド）などで形成することができる。傷付き防止スリーブ７はＰＰ、ＰＥ等プラスチックや金属などで形成することができる。カラー１５は、架橋ポリエチレンなどの汎用エンジニアリングプラスチックや、優れた耐熱性を有するＰＰＳ（ポリフェニレンサルファイド）などの特殊エンジニアリングプラスチックで形成することができる。弾性部材４として圧縮コイルバネを使用する場合は、この部材をオーステナイト系ステンレス鋼（ＳＵＳ３０４）で形成することができ、またストッパーリング１６もこれと同様の材料で形成することができる。抜止部材３は、接続管１１より硬質の材料、例えば接続管１１がオーステナイト系ステンレス鋼（ＳＵＳ３０４）の場合は、マルテンサイト系ステンレス鋼（ＳＵＳ４２０）で形成すればよい。 Each said member which comprises the pipe joint 1 can be formed with the following material, for example. Since the joint main body 2 requires corrosion resistance and rigidity, it can be manufactured by a precision casting method or the like using, for example, an SCS material or a bronze material. The first seal ring 5 and the second and third seal rings 19 and 20 can be formed of O-rings made of olefin rubber, and particularly ethylene and propylene with excellent chlorine resistance and heat resistance and a diene monomer for crosslinking. It is preferable to form it with EPDM which is a terpolymer of the above, and it can also be formed with FKM (fluoro rubber) which is excellent in heat resistance and chemical resistance. The see-through cylinder 6 can be formed of transparent or translucent PPSU (polyphenylsulfone), PEI (polyetherimide), or the like. The damage prevention sleeve 7 can be formed of plastic such as PP or PE, metal, or the like. The collar 15 can be formed of general-purpose engineering plastics such as cross-linked polyethylene or special engineering plastics such as PPS (polyphenylene sulfide) having excellent heat resistance. When a compression coil spring is used as the elastic member 4, this member can be formed of austenitic stainless steel (SUS304), and the stopper ring 16 can be formed of the same material. The retaining member 3 may be formed of a material harder than the connecting pipe 11, for example, martensitic stainless steel (SUS420) when the connecting pipe 11 is austenitic stainless steel (SUS304).

上記の管継手１による接続管１１の施工手順を図２〜図５を参照にして説明する。
予め、図３に示すように継手本体２内に、受口部１２から継手本体２内奥に向かって順に、抜止部材３と、弾性部材４と、第１のシールリング５と、傷付き防止スリーブ７と、透視筒体６、および第２，３のシールリング１９，２０等全ての部品を組み込んでおく。その際、第１のシールリング５は自由状態でこれの内径部が傷付き防止スリーブ７の凹溝２４に嵌まり込むように配置される。この組み込み状態で在庫、保管される。
しかる後、現場施工で、図４に示すように、継手本体２の受口部１２に接続管１１を挿入し、その端部を傷付き防止スリーブ７の接続管端部受け筒部７ｂに挿入して接続管１１の端部の端面を傷付き防止スリーブ７内の段部２３に当接させる。このとき、抜止部材３は受口部１２のテーパ面１３に沿って継手本体２の内奥方向に移動し、かつ係合歯３ａが接続管１１の外周面に係合する。この状態で接続管１１を引き抜く方向に外力が加わったとしても、受口部１２のテーパ面１３に当接する抜止部材３の係合歯３ａが接続管１１の外周面に係合しているので、接続管１１が抜け出ることはない。また、第１のシールリング５と接続管１１の端面との間には傷付き防止スリーブ７が介在した状態にあり、この状態で接続管１１の端面は第１のシールリング５と非接触の状態で継手本体２の奥まで挿入されるので、接続管１１の端面にバリが生じていてもそのバリで第１のシールリング５が傷付けられることはなく、第１のシールリング５の損傷による流体漏れは生じない。 The construction procedure of the connecting pipe 11 by the pipe joint 1 will be described with reference to FIGS.
As shown in FIG. 3, the retaining member 3, the elastic member 4, the first seal ring 5, and the scratch prevention are sequentially provided in the joint body 2 in order from the receiving port 12 toward the inner part of the joint body 2. All the parts such as the sleeve 7, the see-through cylinder 6, and the second and third seal rings 19 and 20 are incorporated. At that time, the first seal ring 5 is arranged in a free state so that the inner diameter portion of the first seal ring 5 fits into the groove 24 of the scratch preventing sleeve 7. Stocked and stored in this built-in state.
Thereafter, as shown in FIG. 4, the connection pipe 11 is inserted into the receiving portion 12 of the joint body 2 and the end thereof is inserted into the connection pipe end receiving tube portion 7 b of the scratch preventing sleeve 7 at the site construction. Then, the end surface of the end portion of the connection pipe 11 is brought into contact with the stepped portion 23 in the scratch preventing sleeve 7. At this time, the retaining member 3 moves inwardly of the joint body 2 along the tapered surface 13 of the receiving portion 12, and the engagement teeth 3 a engage with the outer peripheral surface of the connection pipe 11. Even if an external force is applied in the direction in which the connecting pipe 11 is pulled out in this state, the engaging teeth 3a of the retaining member 3 that contacts the tapered surface 13 of the receiving portion 12 are engaged with the outer peripheral surface of the connecting pipe 11. The connecting pipe 11 will not come out. Further, the scratch-preventing sleeve 7 is interposed between the first seal ring 5 and the end face of the connection pipe 11, and in this state, the end face of the connection pipe 11 is not in contact with the first seal ring 5. Since the joint body 2 is inserted in the state in the state, even if the end face of the connecting pipe 11 has a burr, the first seal ring 5 is not damaged by the burr, and the first seal ring 5 is damaged. There is no fluid leakage.

更に、接続管１１を深く挿入すると、図５の挿入途中過程を経て、図２に示すように継手本体２と接続管１１とのシール接続状態が得られる。すなわち、図５に示すように接続管１１が継手本体２の途中まで挿入されると、抜止部材３の係合歯３ａが接続管１１の外周面に係合した状態で接続管１１は傷付き防止スリーブ７を透視筒体６内に押し込む。更に、図２に示すように、接続管１１が、傷付き防止スリーブ７のシールリング保持筒部７ａが継手本体２内の段部８に達する挿入完了位置まで挿入されると、第１のシールリング５が接続管１１の外周面に圧縮状に密着して接続管１１の外周面と継手本体２の内周面との間を確実に密封シールする状態が得られるとともに、抜止部材３の係合歯３ａが接続管１１の外周面に係合した確実な抜止め状態が得られる。 Further, when the connecting pipe 11 is inserted deeply, a seal connection state between the joint body 2 and the connecting pipe 11 is obtained as shown in FIG. That is, as shown in FIG. 5, when the connecting pipe 11 is inserted partway through the joint body 2, the connecting pipe 11 is damaged in a state where the engaging teeth 3 a of the retaining member 3 are engaged with the outer peripheral surface of the connecting pipe 11. The prevention sleeve 7 is pushed into the see-through cylinder 6. Further, as shown in FIG. 2, when the connection pipe 11 is inserted to the insertion completion position where the seal ring holding cylinder portion 7 a of the damage prevention sleeve 7 reaches the step portion 8 in the joint body 2, the first seal The ring 5 is brought into close contact with the outer peripheral surface of the connection pipe 11 in a compressed manner, so that a state of sealing and sealing between the outer peripheral surface of the connection pipe 11 and the inner peripheral surface of the joint body 2 is obtained. A reliable retaining state in which the tooth 3a is engaged with the outer peripheral surface of the connecting tube 11 is obtained.

こうした接続管１１の挿入完了状態は、確認孔１８から透視筒体６を透して傷付き防止スリーブ７が見えることを確認することによって、接続管１１が所定の位置まで確実に挿入されていることを確認することができる。したがって、接続管１１の挿入不足による内部流体の漏洩の発生を未然に防止することができる。 When the connection tube 11 is inserted, the connection tube 11 is securely inserted to a predetermined position by confirming that the scratch-preventing sleeve 7 can be seen through the see-through cylinder 6 from the confirmation hole 18. I can confirm that. Therefore, it is possible to prevent the internal fluid from leaking due to insufficient insertion of the connecting pipe 11.

接続管１１の挿入完了後、該接続管１１を抜き出し方向に引っ張ると、接続管１１と同行する抜止部材３がテーパ面１３の窄まり側に当接することにより、抜止部材３が径方向内方へ移動して係合歯３ａが接続管１１の外周面へ食い込み係合力を増す。これにより接続管１１の抜け出しが確実に阻止される。 After the connection pipe 11 is completely inserted, when the connection pipe 11 is pulled in the pulling-out direction, the retaining member 3 that accompanies the connecting pipe 11 abuts against the constricted side of the tapered surface 13 so that the retaining member 3 is radially inward. The engaging teeth 3a bite into the outer peripheral surface of the connecting tube 11 to increase the engaging force. This reliably prevents the connection pipe 11 from coming out.

接続管端部受け筒部７ｂを有する傷付き防止スリーブ７が組み込まれていると、次のような利点もある。すなわち、接続管１１の挿入長さが不足した場合には、図５のように接続管１１と第１のシールリング５との間に傷付き防止スリーブ７の接続管端部受け筒部７ｂが介在し、接続管１１が第１のシールリング５と非接触状態になるので、水圧試験で傷付き防止スリーブ７の内周面と接続管１１の外周面との間の隙間から接続管１１の外周面に沿って受口部１２の方向への微小な水漏れを検知することができる。この水漏れ検知により接続管１１の挿入不足を確認できる。 When the damage prevention sleeve 7 having the connecting pipe end receiving tube portion 7b is incorporated, the following advantages are also obtained. That is, when the insertion length of the connecting pipe 11 is insufficient, the connecting pipe end receiving tube portion 7b of the scratch preventing sleeve 7 is provided between the connecting pipe 11 and the first seal ring 5 as shown in FIG. Since the connection pipe 11 is in a non-contact state with the first seal ring 5, the connection pipe 11 has a gap between the inner peripheral surface of the scratch prevention sleeve 7 and the outer peripheral surface of the connection pipe 11 in the water pressure test. A minute water leak in the direction of the receiving port 12 along the outer peripheral surface can be detected. Insufficient insertion of the connecting pipe 11 can be confirmed by this water leak detection.

尚、接続管１１の接続後、接続管１１を管継手１から人為的に離脱させるには、ドライバー等を受口部１２から差し込んでカラー１５を抜止部材３ごと継手本体２の内奥方向へ弾性部材４の弾発力に抗して押し込むことにより、抜止部材３のテーパ面１３との当接による締め付け力が解除され、これで接続管１１を継手本体２から引き抜くことができる。 In addition, after connecting the connection pipe 11, in order to artificially remove the connection pipe 11 from the pipe joint 1, a screwdriver or the like is inserted from the receiving portion 12 and the collar 15 together with the retaining member 3 is moved inwardly of the joint body 2. By pushing against the elastic force of the elastic member 4, the tightening force due to contact with the tapered surface 13 of the retaining member 3 is released, and the connecting pipe 11 can be pulled out from the joint body 2.

図３に示すように、接続管１１を挿入する前、すなわち在庫、保管時には、傷付き防止スリーブ７のシールリング保持筒部７ａの外周に形成した凹溝２４に、自由状態の第１のシールリング５の内径部を嵌まり込む状態にしている。これが、仮に、シールリング保持筒部７ａの外周に第１のシールリング５の内径部を凹溝２４を設けずに嵌め込むと第１のシールリング５の内径部が弾性変形（拡径）する。この状態で長期間放置されると、シールリング５には、いわゆる「ヘタリ現象」が生じて圧縮永久歪が残留し、荷重が除去されても内径が元の寸法に復帰せず、耐用年数の低下をもたらすが、図３に示すように自由状態の第１のシールリング５の内径部がシールリング保持筒部７ａの外周に形成した凹溝２４に嵌まり込む装着状態では、第１のシールリング５には内部応力が発生せず、第１のシールリング５は接続管１１が挿入されたときにはじめて弾性的に拡径して接続管１１の外周に密着するので、適切な圧縮代が長期間にわたり維持され、所定の耐用年数を保証することができる。 As shown in FIG. 3, the first seal in the free state is inserted into the groove 24 formed in the outer periphery of the seal ring holding cylinder portion 7a of the scratch-preventing sleeve 7 before inserting the connecting pipe 11, that is, in stock and storage. The inner diameter portion of the ring 5 is fitted. If, for example, the inner diameter portion of the first seal ring 5 is fitted to the outer periphery of the seal ring holding cylinder portion 7a without providing the concave groove 24, the inner diameter portion of the first seal ring 5 is elastically deformed (expanded). . If left in this state for a long period of time, a so-called “sagging phenomenon” occurs in the seal ring 5 and a permanent compression strain remains. Even if the load is removed, the inner diameter does not return to the original dimension, and the service life of the seal ring 5 is reduced. In the mounted state in which the inner diameter portion of the first seal ring 5 in the free state fits into the groove 24 formed on the outer periphery of the seal ring holding cylinder portion 7a as shown in FIG. No internal stress is generated in the ring 5, and the first seal ring 5 is elastically expanded only when the connecting pipe 11 is inserted and is in close contact with the outer periphery of the connecting pipe 11. It is maintained over a long period of time and can guarantee a predetermined service life.

傷付き防止スリーブ７は例えば赤色や青色などの目立つ色に着色しておくことによって、確認孔１８からより一層確認し易くなる。この場合、傷付き防止スリーブ７への着色手段としては、凹溝２４内のみ、又は接続管端部受け筒部７ｂ外周のみに部分的に確認し易い着色を施しておくことが好ましい。 The damage prevention sleeve 7 is more easily confirmed from the confirmation hole 18 by being colored in a conspicuous color such as red or blue. In this case, as a coloring means for the scratch-preventing sleeve 7, it is preferable to give a color that can be easily confirmed only to the inside of the concave groove 24 or only to the outer periphery of the connecting tube end receiving tube portion 7b.

上記実施例では、第２，３のシールリング１９，２０が継手本体２の内周面に設けたシールリング溝２１，２２にそれぞれ嵌め込まれているが、これに代えて、図１０に示すように第２，３のシールリング１９，２０は透視筒体６の外周に設けたシールリング溝２１，２２にそれぞれ各外径部が突出するように嵌め込むものであってもよい。これにおいても、上記実施例の場合と同様に継手本体２内を流れる水等流体が透視筒体６の外周と継手本体２の内周との間から確認孔１８に漏れ出ることのないように密封シールされる。 In the above embodiment, the second and third seal rings 19 and 20 are respectively fitted in the seal ring grooves 21 and 22 provided on the inner peripheral surface of the joint body 2, but instead, as shown in FIG. The second and third seal rings 19 and 20 may be fitted into the seal ring grooves 21 and 22 provided on the outer periphery of the see-through cylinder 6 so that the respective outer diameter portions protrude. In this case as well, the fluid such as water flowing in the joint body 2 does not leak into the confirmation hole 18 from between the outer periphery of the see-through cylinder 6 and the inner periphery of the joint body 2 as in the case of the above embodiment. Hermetically sealed.

図１１〜図１６は更に他の実施例を示す管継手である。この実施例の管継手は継手本体２内に透視筒体６を組み込んでいないこと、傷付き防止スリーブ７をＳＵＳ焼結材等の金属材で形成し、そのシールリング保持筒部７ａの外径と接続管端部受け筒部７ｂの外径とを第２，３のシールリング１９，２０の内径よりも少し大きい同一径に形成していること、およびシールリング保持筒部７ａの先端部外周に、第２，３のシールリング１９，２０に傷を付けることなく挿入し易くするためのアール又は先窄まりテーパｃを付けていること以外は上記実施例の管継手１と同じであるので、同一部材、同一要素には同一符号を付してその具体的な説明は省略する。
以下、この管継手による接続管１１の施工手順について図１１〜図１４を参照にして説明する。 11 to 16 are pipe joints showing still another embodiment. In the pipe joint of this embodiment, the see-through cylinder 6 is not incorporated in the joint body 2, the scratch-preventing sleeve 7 is formed of a metal material such as SUS sintered material, and the outer diameter of the seal ring holding cylinder portion 7a. And the outer diameter of the connecting pipe end receiving cylinder part 7b are formed to have the same diameter slightly larger than the inner diameters of the second and third seal rings 19 and 20, and the outer periphery of the tip part of the seal ring holding cylinder part 7a. The second and third seal rings 19 and 20 are the same as the pipe joint 1 of the above embodiment except that they are provided with a rounded or tapered taper c for easy insertion without scratching. The same members and the same elements are denoted by the same reference numerals, and the detailed description thereof is omitted.
Hereinafter, the construction procedure of the connecting pipe 11 using this pipe joint will be described with reference to FIGS.

予め、図１２に示すように継手本体２内に、受口部１２から継手本体２内奥に向かって順に、抜止部材３と、弾性部材４と、第１のシールリング５と、傷付き防止スリーブ７および第２，３のシールリング１９，２０等全ての部品を組み込んでおく。その際、第１のシールリング５は自由状態でこれの内径部が傷付き防止スリーブ７の凹溝２４に嵌まり込むように配置される。この組み込み状態で在庫、保管される。 As shown in FIG. 12, the retaining member 3, the elastic member 4, the first seal ring 5, and the scratch prevention are sequentially provided in the joint body 2 in order from the receiving port 12 toward the inner part of the joint body 2. All the parts such as the sleeve 7 and the second and third seal rings 19 and 20 are incorporated. At that time, the first seal ring 5 is arranged in a free state so that the inner diameter portion of the first seal ring 5 fits into the groove 24 of the scratch preventing sleeve 7. Stocked and stored in this built-in state.

しかる後、現場施工で、図１３に示すように、継手本体２の受口部１２に接続管１１を挿入し、その端部を傷付き防止スリーブ７の接続管端部受け筒部７ｂに挿入して接続管１１の端部の端面を傷付き防止スリーブ７内の段部２３に当接させる。このとき、抜止部材３は受口部１２のテーパ面１３に沿って継手本体２の内奥方向に移動し、かつ係合歯３ａが接続管１１の外周面に係合する。この状態で接続管１１を引き抜く方向に外力が加わったとしても、受口部１２のテーパ面１３に当接する抜止部材３の係合歯３ａが接続管１１の外周面に係合しているので、接続管１１が抜け出ることはない。また、第１のシールリング５と接続管１１の端面との間には傷付き防止スリーブ７が介在した状態にあり、この状態で接続管１１の端面は第１のシールリング５と非接触の状態で継手本体２の奥まで挿入されるので、接続管１１の端面にバリが生じていてもそのバリで第１のシールリング５が傷付けられることはなく、第１のシールリング５の損傷による流体漏れは生じない。 Thereafter, as shown in FIG. 13, the connection pipe 11 is inserted into the receiving portion 12 of the joint body 2 and the end thereof is inserted into the connection pipe end receiving tube portion 7 b of the scratch preventing sleeve 7 at the site construction. Then, the end surface of the end portion of the connection pipe 11 is brought into contact with the stepped portion 23 in the scratch preventing sleeve 7. At this time, the retaining member 3 moves inwardly of the joint body 2 along the tapered surface 13 of the receiving portion 12, and the engagement teeth 3 a engage with the outer peripheral surface of the connection pipe 11. Even if an external force is applied in the direction in which the connecting pipe 11 is pulled out in this state, the engaging teeth 3a of the retaining member 3 that contacts the tapered surface 13 of the receiving portion 12 are engaged with the outer peripheral surface of the connecting pipe 11. The connecting pipe 11 will not come out. Further, the scratch-preventing sleeve 7 is interposed between the first seal ring 5 and the end face of the connection pipe 11, and in this state, the end face of the connection pipe 11 is not in contact with the first seal ring 5. Since the joint body 2 is inserted in the state in the state, even if the end face of the connecting pipe 11 has a burr, the first seal ring 5 is not damaged by the burr, and the first seal ring 5 is damaged. There is no fluid leakage.

更に、接続管１１を深く挿入すると、図１４の挿入途中過程を経て、図１１に示すように継手本体２と接続管１１とのシール接続状態が得られる。すなわち、図１４に示すように接続管１１が継手本体２の途中まで挿入されると、抜止部材３の係合歯３ａが接続管１１の外周面に係合した状態で接続管１１は傷付き防止スリーブ７を継手本体２の内奥に押し込む。更に、図１１に示すように、接続管１１が、傷付き防止スリーブ７のシールリング保持筒部７ａが継手本体２内の段部８に達する挿入完了位置まで挿入されると、第１のシールリング５が接続管１１の外周面に圧縮状に密着して接続管１１の外周面と継手本体２の内周面との間を確実に密封シールする状態が得られるとともに、抜止部材３の係合歯３ａが接続管１１の外周面に係合した確実な抜止め状態が得られる。また、継手本体２のシールリング溝２１，２２にそれぞれ各内径部が突出するように嵌め込まれている第２，３のシールリング１９，２０に傷付き防止スリーブ７の外周面が密着して傷付き防止スリーブ７の外周面と継手本体２の確認孔１８を有する内周面との間を密封シールする。これにより継手本体２内を流れる水等流体が傷付き防止スリーブ７の外周と継手本体２の内周との間から確認孔１８に漏れ出ることのないように密封シールされる。 Further, when the connecting pipe 11 is inserted deeply, a seal connection state between the joint body 2 and the connecting pipe 11 is obtained as shown in FIG. That is, as shown in FIG. 14, when the connecting pipe 11 is inserted partway through the joint body 2, the connecting pipe 11 is damaged in a state where the engaging teeth 3 a of the retaining member 3 are engaged with the outer peripheral surface of the connecting pipe 11. The prevention sleeve 7 is pushed into the inner part of the joint body 2. Further, as shown in FIG. 11, when the connection pipe 11 is inserted to the insertion completion position where the seal ring holding cylinder portion 7 a of the damage prevention sleeve 7 reaches the step portion 8 in the joint body 2, the first seal The ring 5 is brought into close contact with the outer peripheral surface of the connection pipe 11 in a compressed manner, so that a state of sealing and sealing between the outer peripheral surface of the connection pipe 11 and the inner peripheral surface of the joint body 2 is obtained. A reliable retaining state in which the tooth 3a is engaged with the outer peripheral surface of the connecting tube 11 is obtained. Further, the outer peripheral surface of the scratch-preventing sleeve 7 is in close contact with the second and third seal rings 19 and 20 which are fitted in the seal ring grooves 21 and 22 of the joint body 2 so that the respective inner diameter portions protrude. The space between the outer peripheral surface of the anti-sticking sleeve 7 and the inner peripheral surface having the confirmation hole 18 of the joint body 2 is hermetically sealed. Thus, a fluid such as water flowing in the joint body 2 is hermetically sealed so as not to leak into the confirmation hole 18 from between the outer periphery of the damage prevention sleeve 7 and the inner periphery of the joint body 2.

こうした接続管１１の挿入完了状態は、確認孔１８から傷付き防止スリーブ７が見えることを確認することによって、接続管１１が所定の位置まで確実に挿入されていることを確認することができる。したがって、接続管１１の挿入不足による内部流体の漏洩の発生を未然に防止することができる。 The state in which the connection pipe 11 is completely inserted can be confirmed by confirming that the damage prevention sleeve 7 can be seen from the confirmation hole 18, so that the connection pipe 11 is securely inserted to a predetermined position. Therefore, it is possible to prevent the internal fluid from leaking due to insufficient insertion of the connecting pipe 11.

接続管１１の挿入完了後、該接続管１１を抜き出し方向に引っ張ると、接続管１１と同行する抜止部材３がテーパ面１３の窄まり側に当接することにより、抜止部材３が径方向内方へ移動して係合歯３ａが接続管１１の外周面への食い込み係合力を増す。これにより接続管１１の抜け出しが確実に阻止される。 After the connection pipe 11 is completely inserted, when the connection pipe 11 is pulled in the pulling-out direction, the retaining member 3 that accompanies the connecting pipe 11 abuts against the constricted side of the tapered surface 13 so that the retaining member 3 is radially inward. The engagement teeth 3a increase the biting engagement force to the outer peripheral surface of the connection tube 11 by moving to the position. This reliably prevents the connection pipe 11 from coming out.

傷付き防止スリーブ７はこれ全体又は凹溝２４を例えば赤色や青色などの目立つ色に着色しておくことによって、確認孔１８からより一層確認し易くなる。 The damage prevention sleeve 7 is more easily confirmed from the confirmation hole 18 by coloring the whole or the concave groove 24 in a conspicuous color such as red or blue.

上記各実施例では、複数個の抜止部材３がそれぞれカラー１５に複数個列設設けた保持穴１５ｂにそれぞれ嵌着されているが、これに代えて、抜止部材３としては、図示省略するが、全体的に一つのリング状に形成し、その内径部に接続管１１の外周面に食い込む係合歯を設けたものを使用し、これを受口部１２の内周のテーパ面１３に収容配備するものであってもよい。この場合は、上記カラー１５や弾性部材４は不要である。 In each of the above embodiments, a plurality of retaining members 3 are respectively fitted into holding holes 15b provided in a row on the collar 15, but instead of this, the retaining members 3 are not shown in the figure. , Which is formed in a ring shape as a whole, and provided with engagement teeth that bite into the outer peripheral surface of the connection tube 11 at the inner diameter thereof, and this is accommodated in the tapered surface 13 on the inner periphery of the receiving port 12 It may be deployed. In this case, the collar 15 and the elastic member 4 are not necessary.

また、上記各実施例では、確認孔１８は透視筒体６及び第２，３のシールリング１９，２０で密封シールしているが、これに代えて、図示省略するが確認孔１８を透明もしくは半透明な透視栓で塞いだり、確認孔１８の外部を透明もしくは半透明な透視カバーで覆ったりする等の確認孔シール手段を採用することもできる。 In each of the above embodiments, the confirmation hole 18 is hermetically sealed with the see-through cylindrical body 6 and the second and third seal rings 19 and 20. Confirmation hole sealing means such as blocking with a translucent see-through plug or covering the outside of the confirmation hole 18 with a transparent or translucent see-through cover can also be employed.

さらに、上記各実施例では、継手本体２の一方の側に接続用雄ねじを形成した雄ねじアダプター管継手について記述したが、本発明はこれに限られず、他の構造、例えば、左右対称のソケット形管継手、エルボ型管継手等にも適用できることは勿論である。また、接続管１１としては、ステンレス鋼管等の金属管に限られず、樹脂製の接続管、例えば塩化ビニール製の接続管などにも適用することができる。 Further, in each of the above-described embodiments, the male thread adapter pipe joint in which the male thread for connection is formed on one side of the joint body 2 has been described. However, the present invention is not limited to this, and other structures such as a symmetrical socket type, for example, Of course, the present invention can also be applied to pipe joints, elbow pipe joints, and the like. Further, the connecting pipe 11 is not limited to a metal pipe such as a stainless steel pipe, and can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

本発明の一実施例の管継手の斜視図である。It is a perspective view of the pipe joint of one example of the present invention. 接続管の挿入完了後の状態を示す同管継手の半欠截断面図である。FIG. 5 is a half-broken cross-sectional view of the pipe joint showing a state after the connection pipe is completely inserted. 接続管を挿入する前の状態を示す同管継手の半欠截断面図である。FIG. 6 is a half-broken cross-sectional view of the pipe joint showing a state before the connection pipe is inserted. 接続管の挿入途中の状態を示す同管継手の半欠截断面図である。FIG. 6 is a half-broken cross-sectional view of the pipe joint showing a state during the insertion of the connecting pipe. 接続管を更なる挿入途中の状態を示す同管継手の半欠截断面図である。It is a half cut-out cross-sectional view of the pipe joint showing a state in which the connecting pipe is further inserted. 同管継手の傷付き防止スリーブの半欠截断面図である。It is a half notched cross-sectional view of the damage prevention sleeve of the pipe joint. 同管継手のカラーの平面図である。It is a top view of the color of the pipe joint. 同カラーの正面図である。It is a front view of the same color. 同カラーの断面図である。It is sectional drawing of the same color. 他の実施例の管継手を図３に相応して示す半欠截断面図である。FIG. 4 is a half-broken cross-sectional view showing a pipe joint of another embodiment corresponding to FIG. 3. 更に他の実施例の管継手を図２に相応して示す半欠截断面図である。FIG. 6 is a half-broken cross-sectional view showing a pipe joint of still another embodiment corresponding to FIG. 2. 接続管を挿入する前の状態を示す図１１の管継手を図３に相応して示す半欠截断面図である。FIG. 13 is a half-broken cross-sectional view corresponding to FIG. 3 showing the pipe joint of FIG. 11 showing a state before the connection pipe is inserted. 接続管の挿入途中の状態を示す図１１の管継手を図４に相応して示す半欠截断面図である。FIG. 13 is a half-broken cross-sectional view corresponding to FIG. 4 illustrating the pipe joint of FIG. 11 showing a state during the insertion of the connecting pipe. 接続管を更なる挿入途中の状態を示す図１１の管継手を図５に相応して示す半欠截断面図である。FIG. 12 is a half-broken sectional view showing the pipe joint of FIG. 11 corresponding to FIG. 図１１の管継手の傷付き防止スリーブの斜視図である。It is a perspective view of the damage prevention sleeve of the pipe joint of FIG. 図１１の管継手の傷付き防止スリーブの一部拡大断面図である。It is a partially expanded sectional view of the damage prevention sleeve of the pipe joint of FIG. 従来例の管継手の半欠截断面図である。It is a half notched cross-sectional view of a conventional pipe joint.

１管継手
２継手本体
３抜止部材
４弾性部材
５第１のシールリング
６透視筒体
７傷付き防止スリーブ
７ａシールリング保持筒部
７ｂ接続管端部受け筒部
１１接続管
１２受口部
１３テーパ面
１８確認孔
１９第２のシールリング
２０第３のシールリング
２４凹溝 DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 3 Detachment member 4 Elastic member 5 1st seal ring 6 See-through | cylindrical cylinder 7 Scratch prevention sleeve 7a Seal ring holding | maintenance cylinder part 7b Connection pipe end receiving cylinder part 11 Connection pipe 12 Receptacle part 13 Taper Surface 18 Confirmation hole 19 Second seal ring 20 Third seal ring 24 Concave groove

Claims

接続管の端部を受け入れる受口部を有する継手本体内に、前記受口部から継手本体内奥に向かって順に、前記接続管の外周面に係合される抜止部材と、前記接続管の外周面に密着する第１のシールリングとを収容配置しており、
前記第１のシールリングより継手本体内奥側に対応する前記継手本体の円周上の少なくとも１箇所には確認孔を内外貫通状に設けており、
前記第１のシールリングの内径部に、前記接続管の端部の末端に外嵌可能な傷付き防止スリーブが配置され、この傷付き防止スリーブは、前記接続管の挿入に伴い該接続管の末端で前記確認孔の内側位置にまで押し込まれるようにしてあり、
前記傷付き防止スリーブは、内径が前記接続管の内径と略同一径に形成されたシールリング保持筒部と、このシールリング保持筒部の後端側に一体に連設され、内径が前記接続管の外径よりも大きく形成されて前記接続管の端部に外嵌可能な接続管端部受け筒部とを有する形に形成されており、
前記シールリング保持筒部の外周に、自由状態の前記第１のシールリングの内径部が嵌まり込む凹溝を形成していることを特徴とする管継手。 In the joint main body having a receiving part for receiving the end of the connecting pipe, in order from the receiving part toward the inner part of the joint main body, a retaining member engaged with the outer peripheral surface of the connecting pipe, and the connecting pipe A first seal ring that is in close contact with the outer peripheral surface is accommodated and disposed.
A confirmation hole is provided in an inner and outer through shape in at least one place on the circumference of the joint body corresponding to the inner side of the joint body from the first seal ring,
A scratch-proof sleeve that can be fitted on the end of the end of the connection pipe is disposed on the inner diameter portion of the first seal ring. The scratch-proof sleeve is connected to the connection pipe along with the insertion of the connection pipe. Ri Citea as pushed at the end to the inside position of the confirmation holes,
The scratch-preventing sleeve is integrally connected to a seal ring holding cylinder portion having an inner diameter substantially the same as the inner diameter of the connection pipe and a rear end side of the seal ring holding cylinder portion, and the inner diameter is the connection It is formed in a shape having a connecting tube end receiving tube portion that is formed larger than the outer diameter of the tube and can be externally fitted to the end portion of the connecting tube,
A pipe joint, wherein a concave groove into which an inner diameter portion of the first seal ring in a free state is fitted is formed on an outer periphery of the seal ring holding cylinder portion .

前記継手本体内の前記第１のシールリングより継手本体内奥側であって前記確認孔の内側の位置に、前記接続管の端部の外周を覆う透視筒体を収容配置しており、前記透視筒体の外周と前記継手本体の内周との間であって前記確認孔よりも継手本体内奥側の位置に第２のシールリングを、前記確認孔よりも受口部側の位置に第３のシールリングをそれぞれ介在配置している、請求項１に記載の管継手。 The fluoroscopic cylinder that covers the outer periphery of the end of the connecting pipe is accommodated and disposed at a position on the inner side of the confirmation hole on the inner side of the joint body from the first seal ring in the joint body, Between the outer periphery of the see-through cylinder and the inner periphery of the joint main body, the second seal ring is located at a position closer to the inner side of the joint main body than the confirmation hole, and at a position closer to the receiving portion than the confirmation hole. The pipe joint according to claim 1, wherein a third seal ring is interposed.

前記継手本体内の前記第１のシールリングと前記抜止部材との間に、前記抜止部材を受口部の内周に向かって押圧付勢する弾性部材を収容配置しており、前記受口部の内周に、前記抜止部材の当接により該抜止部材に径方向内方への移動作用を加えるテーパ面を受口部外方に向かって窄まり状に形成している、請求項１に記載の管継手。 An elastic member that presses and urges the retaining member toward the inner periphery of the receiving portion is disposed between the first seal ring in the joint body and the retaining member, and the receiving portion the inner periphery of said forming a tapered surface to apply a moving action of the contact radially inwardly該抜stop member by the retaining member to form Subomari toward the receptacle outer side, in claim 1 The described pipe joint.