JP2004183721A

JP2004183721A - Pipe joint structure

Info

Publication number: JP2004183721A
Application number: JP2002349465A
Authority: JP
Inventors: Kenji Mitsune; 研二三根
Original assignee: Bridgestone Flowtech Corp
Current assignee: Bridgestone Flowtech Corp
Priority date: 2002-12-02
Filing date: 2002-12-02
Publication date: 2004-07-02
Anticipated expiration: 2022-12-02
Also published as: JP4381676B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint structure allowing confirming completion of connection not only by a sound but also visually, with improved connection reliability. <P>SOLUTION: The pipe joint structure is set in a connected state by inserting a pipe body 40 formed with a recessed part 42 fitted with a pressing member 9 on an outer periphery into the pipe joint having a seal ring 6 fitted in a peripheral groove 5 of a deeper side of a female body 1, an elastic body 7 provided in an inner surface of an outer collar 10 extending from the female body 1, and an inner collar 8 slidable in the axial direction of the pipe while supporting the pressing member 9. When the pipe body 40 is inserted into the inner surface of the inner collar 8, an end part of the inner collar 8 originally protruded from the outer collar 10, once penetrates into the inner part of the outer collar 10. When the pipe body 40 is inserted to the inner surface and the pressing member 9 is fitted to the recessed part 42, the end part of the inner collar 8 protrudes from the outer collar 10 again. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、各種の配管や水栓金具等に使用される管継手構造に関するものであり、特に、管体の結合完了を簡単に確認することができる管継手構造に関するものである。
【０００２】
【従来の技術】
従来から、金属製の管体を結合及び離脱する管継手構造として、図２に示すものが知られている。即ち、図２に示す管継手は、基体となる雌体１の流路の最深部に、挿入される管体４０の先端４１が当たる段部２を備えると共に、深部側の内周にシールリング６としてＯ−リングの嵌め込み用の周溝５が形成され、この深部側より弾性体７としてコイルバネ、押圧部材９及びこの押圧部材を支持する内カラー８が配置されている。そして、内カラー８は管軸方向に摺動可能となっており、雌体１からのびる外カラー１０にて覆われている。なお、外カラー１０の先端は深部側が大径となるテーパー部１１となっているので、内カラー８が抜け出すことはない。一方、図２に示す管体４０の外周には、その先端４１が雌体１の段部２に当接した際に押圧部材９が嵌り合う凹部４２が形成されている。
【０００３】
ここで、金属製の管体４０を結合するには雌体１の内カラー８の先端より管体４０を挿入する。すると、管体４０の挿入によってその先端４１が押圧部材９を通過し、押圧部材９が内カラー８と共に深部側に押される。そして、管体４０の先端４１が流路の最深部の段部２に当接すると、押圧部材９である硬質ボールが管体４０の外周面に形成した凹部４２に落ち込み、弾性体７であるコイルバネによって内カラー８と共に内カラー８の先端側に押し戻される。この際、内カラー８は往復移動することとなるが外カラー１０の中に隠れることはなく、凹部４２に押圧部材９（硬質ボール）が落ち込むことにより金属同士の衝突音としてカチッという音がするので、管体４０が結合したことが確認される（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特開平１０−２９９９６８号公報（第２−４頁、図１−５）
【０００５】
【発明が解決しようとする課題】
しかしながら、この従来例の管継手にあっても更に改良が要請されている面もある。即ち、結合完了の衝突音は挿入時に１度出るだけなので、聞き逃すこともあり得ないわけではない。そのため、目視確認のために管体４０に予め挿入マークを付けておき、挿入マークが外カラー１０の端部と重なる位置まで管体４０を挿入することで、結合を確認するようにすることも考えられる。ところが、今度は挿入マークを付ける作業が必要となってしまう。
【０００６】
そこで本発明は、挿入マークによらずに、衝突音だけでなく目視によっても結合完了の確認ができ、結合の信頼性を向上させることができる管継手構造を提供することを目的とするものである。
【０００７】
【課題を解決するための手段】
本発明は、以上の課題を解決するためになされたものであって、その要旨は、雌体の深部側の周溝にシールリングが嵌め込まれ、雌体からのびる外カラーの内面に弾性体と、押圧部材を支持しつつ管軸方向に摺動可能な内カラーが配置された管継手に、押圧部材が嵌まり合う凹部を外周に形成した管体を挿入することで結合状態となる管継手構造であって、内カラーの内面に管体を挿入すると、初めに外カラーから突出していた内カラーの端部が一旦外カラーの内部に隠れ、更に管体を挿入して凹部に押圧部材が嵌まり合うと、再び内カラーの端部が外カラーから突出する管継手構造に係るものである。そして好ましくは、管体を挿入する前の内カラーの突出長さと、管体を挿入した後の突出長さとが異なる管継手構造に係るものである。
【０００８】
【発明の実施の形態】
本発明の管継手構造は上記のような構造を有するため、管継手と金属製の管体との結合にあっては、従来例と同様に、雌体の内カラーの先端より管体を挿入することにより結合されることとなる。即ち、金属製の管体を雌体の内カラーの先端より挿入して管体の先端が押圧部材を通過すると、押圧部材は内カラーと共に継手深部側に押されるが、管体の先端が流路の最深部の段部に当接すると押圧部材（硬質ボール）は管体外周面に形成した周溝内に落ち込み、弾性体（コイルバネ）により内カラーと共に内カラーの先端側へ押し戻され、管体の結合が完了する。そして、この周溝内への押圧部材（硬質ボール）の落ち込み時に、金属同士であるためにカチッという音がすることで管体の結合が完全であることが確認される。
【０００９】
ここで、本発明の管継手構造は特徴的に、内カラーの内面に管体を挿入した際に、初め外カラーから突出していた内カラーの端部が一旦外カラーの内部に隠れる。そして、更に管体を挿入して凹部に押圧部材が嵌まり合うと、再び内カラーの端部が外カラーから突出する。従って、カチッという衝突音だけでなく、目視によっても結合完了の確認ができる。
【００１０】
このように、内カラーが一度隠れるようにするには、管体の凹部の位置や幅、内カラーの長さを適当に設定することによって実現できる。この際、一度隠れた内カラーが初めと同じ位置に戻るように設定することもできるが、同じ位置ではなく、管体を挿入する前の内カラーの突出長さと、管体を挿入した後の突出長さとが異なるように設定することもできる。そのようにすれば、内カラーの位置によっていつでも結合の状態が確認できるようになる点で好ましい。
【００１１】
一方、管継手からの管体の離脱は次の通りである。即ち、結合された管継手と管体にあって、内カラーの先端を内側に押すと、外カラーのテーパー部に接触していた押圧部材（硬質ボール）が内カラーと共に内側に移動する。すると、押圧部材（硬質ボール）と外カラーとの接触が解かれ、管体の表面を押す力が解除される。そして、この状態を保ちつつ管体を引き抜けば、両者の離脱が簡単に行える。次いで、管体を離脱した後に内カラーを押す力を緩めれば、再び弾性体（コイルバネ）によって内カラーが押されて元の状態に戻ることとなり、ここに管体の結合、離脱が繰り返されることとなるのである。
【００１２】
なお、本発明において、雌体と外カラーとは別体のものを接続して構成しても一体的に形成してもよく、シールリングには、Ｏ−リング、断面Ｖ字状のシールリング等を用いることができ、１個であっても複数個あってもよい。また、本発明で用いられる弾性体としては、コイルバネ、皿バネ、筒状のゴム弾性体等を用いることができ、これは内カラーに反発力を与えるものである。更に、本発明における押圧部材は硬質ボールに限られず、管体の凹部に嵌まり合って管体の表面を押圧できるものであればよい。
【００１３】
【実施例】
以下、本発明の管継手構造を実施例をもって更に詳細に説明する。図１は本発明の管継手構造の一例を示す半断面図である。図中、１は管継手の基体をなす雌体であって、段部２をはさんで右側に大径部３の流路が、そして左側に小径部４の流路が形成されている。そして、大径部３の内面に２個の周溝５，５が備えられ、ここにＯ−リングであるシールリング６，６が嵌め込まれている。また、大径部３の縁端にコイルバネの弾性体７が、続いて合成樹脂製の内カラー８が硬質ボールの押圧部材９と共に配置され、これらの全体が外カラー１０で覆われている。なお、この外カラー１０は雌体１の大径部３の外周面に外挿されたものであり、その先端が縮径されてテーパー部１１を形成している。
【００１４】
大径部３の外周面と外カラー１０との係合手段は種々あり特に限定されるものではないが、図１の実施例にあっては、大径部３の外周面と外カラー１０の内周面にそれぞれ周溝１２，１３を形成し、ここに止め輪１４を嵌め込んで係止している。従って、外カラー１０は雌体１の大径部２に対して揺動可能となり、大径部２に対して周方向に回転可能で、かつ、外カラー１０が雌体１に対して若干の偏心が可能となっているので、内カラー８への管体４０の挿入が極めて容易となるばかりか、結合状態にあっても好ましい結果をもたらすものとなる。
【００１５】
一方、金属製の管体４０にあっては、管体４０の先端４１より所定の位置に凹部４２が形成されている。この管体４０の先端４１と凹部４２との間隔Ｗは、雌体１の段部２と押圧部材９（硬質ボール）との間隔Ｘと略等しい間隔である。また、凹部４２の幅は３〜５ｍｍとなっている。
【００１６】
ここで、図１に示す実施例における管継手と管体との結合及び離脱を更に詳細に説明する。図１（Ａ）は管体４０の挿入前の状態を示しており、内カラー８の端部の外カラー１０からの突出長さＬは２〜３ｍｍとなっている。この状態で管体４０を内カラー８内に挿入すると、その先端４１が押圧部材９を通過し、押圧部材９が内カラー８と共に継手深部側に押される。
【００１７】
すると、図１（Ｂ）に示すように、初めは外カラー１０から突出していた内カラー８の端部が、一旦外カラー１０の内部に隠れて視界から消える。逆に、内カラー８が視界から消えない状態は管体４０の挿入不足であるので、内カラー８の先端がシールリング６（Ｏ−リング）に当接した状態を、雌体１の流路の最深部にある段部２に当接したものと間違えることはない。
【００１８】
そして、管体４０の先端４１が段部２まで至ると、押圧部材９（硬質ボール）が金属製の管体４０の外周面に形成した凹部４２に落ち込んで、カチッという衝突音が発生する。同時に、弾性体７（コイルバネ）によって、凹部４２の幅内で押圧部材９（硬質ボール）及び内カラー８が先端側に押し戻され、図１（Ｃ）に示す結合状態となる。この際、一度視界から消えた内カラー８の端部が再び外カラー１０から突出することとなるので、内カラー８の目視と衝突音の両方から、管体４０の結合完了が確認できる。なお、図１（Ｃ）の結合状態において、内カラー８の突出長さＬ’は０．５ｍｍ程度となっており、図１（Ａ）の状態の突出長さＬ（２〜３ｍｍ）よりも目視で判断できる有意差が付けられている。
【００１９】
図１（Ｃ）に示す結合状態にあって、管体４０をこの結合状態から引き抜くために力を入れた場合、或いはこの状態で管体４０内に流体を流した場合、即ち、管体４０が引き抜かれる方向に力が働いた場合には、管体４０が凹部４２の幅内で移動する。但し、押圧部材９（硬質ボール）は、弾性体７（コイルバネ）の反発力によって外カラー１０のテーパー部１１側に押し付けられており、その外カラー１０のテーパー部１１によってこの押圧部材９（硬質ボール）が管体４０の表面を押圧するので、押圧部材９（硬質ボール）が凹部４２から抜け出すことはない。従って、管体４０の引き抜きは阻止される。
【００２０】
即ち、押圧部材９（硬質ボール）は外カラー１０のテーパー部１１によって管体４０側におされ、管体４０の外表面に形成した凹部４２内に食い込むことになる。ここで更に過大な圧力又は引き抜き力がかかった場合には、内カラー８は押圧部材９（硬質ボール）と管体４０に追従して外カラー１０の小径側へ移動し、そのため押圧部材９（硬質ボール）が外カラー１０のテーパー部１１によって更に管体４０側におされ、より強固に管体４０を把持するのである。
【００２１】
一方、管体４０を離脱させる場合には、内カラー８の端部が外カラー１０から突出していることを利用する。即ち、管体４０を引き抜くには、図１（Ｃ）の状態にある内カラー８の突出端部を雌体１の方向に押し、内カラー８を雌体１側に移動させる。すると、押圧部材９（硬質ボール）もこれと共に移動してテーパー部１１との接触による締め付け力が解除され、凹部４２から抜け出す。従って、内カラー８を雌体１側に押したまま管体４０を引き抜けば、図１（Ｂ）の状態を経て管体４０が雌体１から離脱し、図１（Ａ）の状態に戻る。
【００２２】
【発明の効果】
本発明の管継手構造は、雌体の深部側の周溝にシールリングが嵌め込まれ、雌体からのびる外カラーの内面に弾性体と、押圧部材を支持しつつ管軸方向に摺動可能な内カラーが配置された管継手に、押圧部材が嵌まり合う凹部を外周に形成した管体を挿入することで結合状態となる管継手構造であって、内カラーの内面に管体を挿入すると、初めに外カラーから突出していた内カラーの端部が一旦外カラーの内部に隠れ、更に管体を挿入して凹部に押圧部材が嵌まり合うと、再び内カラーの端部が外カラーから突出するので、挿入マークによらずに、衝突音だけでなく目視によっても結合完了の確認ができ、結合の信頼性を向上させることができる。
【図面の簡単な説明】
【図１】図１は、本発明の管継手構造の実施例を示す半断面図である。
【図２】図２は、従来の管継手構造の一例を示す半断面図である。
【符号の説明】
１‥雌体
２‥段部
３‥大径部
４‥小径部
５‥周溝
６‥シールリング
７‥弾性体
８‥内カラー
９‥押圧部材
１０‥外カラー
１１‥テーパー部
１２，１３‥周溝
１４‥止め輪
４０‥管体
４１‥先端
４２‥凹部
Ｌ ‥管体を挿入前の突出長さ
Ｌ’‥管体を挿入後の突出長さ
Ｘ ‥雌体の段部と押圧部材との間隔
Ｗ ‥管体の先端と凹部との間隔[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe joint structure used for various pipes, faucet fittings, and the like, and particularly to a pipe joint structure capable of easily confirming completion of connection of pipes.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a pipe joint structure shown in FIG. 2 is known as a pipe joint structure for connecting and detaching a metal pipe. That is, the pipe joint shown in FIG. 2 is provided with a stepped portion 2 at the deepest part of the flow path of the female body 1 serving as a base, where the distal end 41 of the pipe body 40 to be inserted contacts, and a seal ring on the inner periphery on the deep side. A peripheral groove 5 for fitting an O-ring is formed as 6, and a coil spring, a pressing member 9, and an inner collar 8 supporting the pressing member are arranged as elastic bodies 7 from the deep side. The inner collar 8 is slidable in the tube axis direction, and is covered with an outer collar 10 extending from the female body 1. In addition, since the front end of the outer collar 10 is a tapered portion 11 having a large diameter on the deep side, the inner collar 8 does not come off. On the other hand, a concave portion 42 into which the pressing member 9 is fitted when the tip 41 abuts on the step portion 2 of the female body 1 is formed on the outer periphery of the tubular body 40 shown in FIG.
[0003]
Here, to connect the metal tube 40, the tube 40 is inserted from the tip of the inner collar 8 of the female body 1. Then, the distal end 41 passes through the pressing member 9 due to the insertion of the tube body 40, and the pressing member 9 is pushed to the deep side together with the inner collar 8. When the distal end 41 of the tubular body 40 comes into contact with the step portion 2 at the deepest part of the flow path, the hard ball as the pressing member 9 falls into the concave portion 42 formed on the outer peripheral surface of the tubular body 40 and is the elastic body 7. The inner collar 8 is pushed back together with the inner collar 8 to the tip side of the inner collar 8 by the coil spring. At this time, the inner collar 8 reciprocates, but does not hide in the outer collar 10, and the pressing member 9 (hard ball) falls into the concave portion 42, so that a clicking sound is generated as a collision sound between metals. Therefore, it is confirmed that the tube body 40 has been connected (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-10-299968 (page 2-4, FIG. 1-5)
[0005]
[Problems to be solved by the invention]
However, there is also a need for further improvements in this conventional pipe joint. That is, since the collision sound of completion of the coupling is emitted only once at the time of insertion, it is not impossible to miss it. Therefore, an insertion mark may be attached to the tube 40 in advance for visual confirmation, and the tube 40 may be inserted to a position where the insertion mark overlaps the end of the outer collar 10 to confirm the connection. Conceivable. However, this time, the work of attaching the insertion mark is required.
[0006]
Therefore, an object of the present invention is to provide a pipe joint structure capable of confirming the completion of coupling not only by an impact mark but also by visual inspection in addition to a collision sound and improving the reliability of coupling. is there.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist of the present invention is that a seal ring is fitted into a circumferential groove on a deep side of a female body, and an elastic body is provided on an inner surface of an outer collar extending from the female body. A pipe joint having a concave portion on the outer periphery where a pressing member fits is inserted into a pipe joint in which an inner collar slidable in the pipe axis direction while supporting the pressing member is inserted into a pipe joint. When the tube is inserted into the inner surface of the inner collar, the end of the inner collar that first protrudes from the outer collar is once hidden inside the outer collar, and then the tube is inserted and the pressing member is inserted into the recess. The present invention relates to a pipe joint structure in which, when fitted, the end of the inner collar projects again from the outer collar. And, preferably, the present invention relates to a pipe joint structure in which the protruding length of the inner collar before inserting the tubular body and the protruding length after inserting the tubular body are different.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Since the pipe joint structure of the present invention has the above-described structure, when connecting the pipe joint to the metal pipe, the pipe is inserted from the tip of the inner collar of the female body as in the conventional example. Will be combined. That is, when a metal pipe is inserted from the tip of the inner collar of the female body and the tip of the pipe passes through the pressing member, the pressing member is pushed together with the inner collar toward the joint deeper side. When the pressing member (hard ball) comes into contact with the deepest step portion of the road, it falls into the circumferential groove formed on the outer peripheral surface of the tube body, and is pushed back to the tip side of the inner collar together with the inner collar by the elastic body (coil spring). The body connection is complete. Then, when the pressing member (hard ball) falls into the circumferential groove, a clicking sound is generated because the pressing member (hard ball) is made of metal, thereby confirming that the connection of the pipes is complete.
[0009]
Here, the pipe joint structure of the present invention is characterized in that when the pipe is inserted into the inner surface of the inner collar, the end of the inner collar that first protrudes from the outer collar is temporarily hidden inside the outer collar. When the tube is further inserted and the pressing member fits into the recess, the end of the inner collar projects again from the outer collar. Therefore, the completion of the connection can be confirmed not only by the clicking sound but also by visual observation.
[0010]
In this way, the inner collar can be hidden once by appropriately setting the position and width of the concave portion of the tube and the length of the inner collar. At this time, it is possible to set the inner collar once hidden to return to the same position as the beginning, but it is not the same position, but the protrusion length of the inner collar before inserting the tube, and the position after inserting the tube It can also be set so that the projection length is different. This is preferable in that the connection state can be confirmed at any time by the position of the inner collar.
[0011]
On the other hand, detachment of the pipe from the pipe joint is as follows. That is, when the front end of the inner collar is pushed inward in the coupled pipe joint and pipe body, the pressing member (hard ball) that has been in contact with the tapered portion of the outer collar moves inward together with the inner collar. Then, the contact between the pressing member (hard ball) and the outer collar is released, and the force for pressing the surface of the tubular body is released. Then, if the tube is pulled out while maintaining this state, the two can be easily separated. Next, if the force for pushing the inner collar is released after the tube is detached, the inner collar is pushed again by the elastic body (coil spring) to return to the original state, and the connection and detachment of the tube are repeated here. That would be.
[0012]
In the present invention, the female body and the outer collar may be connected to each other or may be integrally formed. The seal ring may be an O-ring or a V-shaped seal ring. Etc. can be used, and there may be one or more. In addition, as the elastic body used in the present invention, a coil spring, a disc spring, a cylindrical rubber elastic body, or the like can be used, which gives a repulsive force to the inner collar. Further, the pressing member in the present invention is not limited to a hard ball, and may be any member that can fit into the concave portion of the tube and press the surface of the tube.
[0013]
【Example】
Hereinafter, the pipe joint structure of the present invention will be described in more detail with reference to examples. FIG. 1 is a half sectional view showing an example of the pipe joint structure of the present invention. In the figure, reference numeral 1 denotes a female body which forms a base of a pipe joint. A flow path of a large-diameter portion 3 is formed on the right side of a step portion 2 and a flow path of a small-diameter portion 4 is formed on the left side. Further, two peripheral grooves 5, 5 are provided on the inner surface of the large diameter portion 3, and seal rings 6, 6, which are O-rings, are fitted therein. An elastic body 7 of a coil spring is arranged at the edge of the large-diameter portion 3, and an inner collar 8 made of a synthetic resin is arranged together with a pressing member 9 of a hard ball, and these are entirely covered with an outer collar 10. The outer collar 10 is extrapolated to the outer peripheral surface of the large-diameter portion 3 of the female body 1, and has a tapered portion 11 whose distal end is reduced in diameter.
[0014]
There are various types of engagement means between the outer peripheral surface of the large diameter portion 3 and the outer collar 10 and there is no particular limitation. In the embodiment shown in FIG. Circumferential grooves 12 and 13 are formed on the inner peripheral surface, and retaining rings 14 are fitted and locked therein. Therefore, the outer collar 10 can swing with respect to the large-diameter portion 2 of the female body 1, can rotate in the circumferential direction with respect to the large-diameter portion 2, and the outer collar 10 slightly moves with respect to the female body 1. Since the eccentricity is possible, not only is the insertion of the tube 40 into the inner collar 8 extremely easy, but also a favorable result is obtained even in the connected state.
[0015]
On the other hand, in the metal tube 40, a concave portion 42 is formed at a predetermined position from the tip 41 of the tube 40. The distance W between the distal end 41 of the tube 40 and the recess 42 is substantially equal to the distance X between the step 2 of the female body 1 and the pressing member 9 (hard ball). The width of the concave portion 42 is 3 to 5 mm.
[0016]
Here, connection and detachment of the pipe joint and the pipe body in the embodiment shown in FIG. 1 will be described in more detail. FIG. 1A shows a state before the tube body 40 is inserted, and the length L of the end of the inner collar 8 protruding from the outer collar 10 is 2 to 3 mm. When the tube 40 is inserted into the inner collar 8 in this state, the distal end 41 passes through the pressing member 9, and the pressing member 9 is pressed together with the inner collar 8 toward the joint deeper.
[0017]
Then, as shown in FIG. 1B, the end of the inner collar 8 that initially protrudes from the outer collar 10 is temporarily hidden inside the outer collar 10 and disappears from view. Conversely, when the inner collar 8 does not disappear from the field of view, the tube body 40 is insufficiently inserted. Therefore, the state in which the tip of the inner collar 8 contacts the seal ring 6 (O-ring) is referred to as the flow path of the female body 1. Is not mistaken for the one that abuts the step 2 at the deepest part.
[0018]
When the distal end 41 of the tube 40 reaches the stepped portion 2, the pressing member 9 (hard ball) falls into the concave portion 42 formed on the outer peripheral surface of the metal tube 40, and a click sound is generated. At the same time, the pressing member 9 (hard ball) and the inner collar 8 are pushed back to the tip side within the width of the concave portion 42 by the elastic body 7 (coil spring), and the connected state shown in FIG. At this time, since the end of the inner collar 8 once disappeared from the field of view projects again from the outer collar 10, the completion of the connection of the tube body 40 can be confirmed from both the visual observation of the inner collar 8 and the collision sound. 1C, the protruding length L ′ of the inner collar 8 is about 0.5 mm, which is larger than the protruding length L (2 to 3 mm) in the state of FIG. 1A. There is a significant difference that can be visually judged.
[0019]
In the connected state shown in FIG. 1C, when a force is applied to pull out the tube 40 from the connected state, or when a fluid is flowed into the tube 40 in this state, that is, the tube 40 When a force acts in the direction in which the tube is pulled out, the tube body 40 moves within the width of the concave portion 42. However, the pressing member 9 (hard ball) is pressed against the tapered portion 11 of the outer collar 10 by the repulsive force of the elastic body 7 (coil spring), and the tapered portion 11 of the outer collar 10 causes the pressing member 9 (hard ball) to be pressed. Since the ball) presses the surface of the tube 40, the pressing member 9 (hard ball) does not come out of the concave portion. Therefore, the tube 40 is prevented from being pulled out.
[0020]
That is, the pressing member 9 (hard ball) is placed on the tube 40 side by the tapered portion 11 of the outer collar 10 and bites into the concave portion 42 formed on the outer surface of the tube 40. Here, when a further excessive pressure or pull-out force is applied, the inner collar 8 moves to the smaller diameter side of the outer collar 10 following the pressing member 9 (hard ball) and the tube 40, so that the pressing member 9 ( The hard ball) is further placed on the tube 40 side by the tapered portion 11 of the outer collar 10, so that the tube 40 is more firmly gripped.
[0021]
On the other hand, when the tube 40 is detached, the fact that the end of the inner collar 8 projects from the outer collar 10 is used. That is, in order to pull out the tube 40, the protruding end of the inner collar 8 in the state of FIG. 1C is pushed in the direction of the female body 1, and the inner collar 8 is moved to the female body 1 side. Then, the pressing member 9 (hard ball) also moves together with the pressing member 9 to release the tightening force due to the contact with the tapered portion 11, and comes out of the concave portion 42. Therefore, if the tubular body 40 is pulled out while the inner collar 8 is pressed toward the female body 1, the tubular body 40 separates from the female body 1 via the state of FIG. 1B and returns to the state of FIG. Return.
[0022]
【The invention's effect】
In the pipe joint structure of the present invention, the seal ring is fitted in the circumferential groove on the deep side of the female body, and the elastic body and the inner surface of the outer collar extending from the female body can slide in the pipe axis direction while supporting the pressing member. In the pipe joint structure in which the inner collar is arranged, a pipe joint structure in which a concave portion in which the pressing member fits is formed on the outer periphery is inserted by inserting a pipe body, and when the pipe body is inserted into the inner surface of the inner collar. First, the end of the inner collar, which first protruded from the outer collar, is once hidden inside the outer collar, and when the tube is inserted and the pressing member fits into the recess, the end of the inner collar is again moved from the outer collar. Because of the protrusion, the completion of the connection can be confirmed not only by the insertion mark but also by visual inspection, not only by the impact sound, and the reliability of the connection can be improved.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an embodiment of a pipe joint structure of the present invention.
FIG. 2 is a half sectional view showing an example of a conventional pipe joint structure.
[Explanation of symbols]
1 female body 2 stepped part 3 large diameter part 4 small diameter part 5 peripheral groove 6 seal ring 7 elastic body 8 inner collar 9 pressing member 10 outer collar 11 taper parts 12, 13 circumference Groove 14 ‥ Retaining ring 40 ‥ Tube 41 ‥ Tip 42 ‥ Concave L 突出 Projection length L ′ before insertion of tube 突出 Projection length X after insertion of tube ‥ Connection between step portion of female body and pressing member Spacing W 間隔 Spacing between tip of tube and recess

Claims

雌体（１）の深部側の周溝（５）にシールリング（６）が嵌め込まれ、雌体（１）からのびる外カラー（１０）の内面に弾性体（７）と、押圧部材（９）を支持しつつ管軸方向に摺動可能な内カラー（８）が配置された管継手に、押圧部材（９）が嵌まり合う凹部（４２）を外周に形成した管体（４０）を挿入することで結合状態となる管継手構造であって、内カラー（８）の内面に管体（４０）を挿入すると、初めに外カラー（１０）から突出していた内カラー（８）の端部が一旦外カラー（１０）の内部に隠れ、更に管体（４０）を挿入して凹部（４２）に押圧部材（９）が嵌まり合うと、再び内カラー（８）の端部が外カラー（１０）から突出することを特徴とする管継手構造。A seal ring (6) is fitted into a circumferential groove (5) on the deep side of the female body (1), and an elastic body (7) and a pressing member (9) are provided on the inner surface of an outer collar (10) extending from the female body (1). The pipe (40) having a concave portion (42) on the outer periphery of the pipe joint in which the inner collar (8) slidable in the pipe axis direction is disposed while supporting the pressing member (9). A pipe joint structure which is brought into a connected state by being inserted. When a pipe (40) is inserted into the inner surface of an inner collar (8), an end of an inner collar (8) which first protrudes from an outer collar (10). Once the portion is hidden inside the outer collar (10), and further the tube (40) is inserted and the pressing member (9) fits into the recess (42), the end of the inner collar (8) is again A pipe joint structure protruding from a collar (10).

管体（４０）を挿入する前の内カラー（８）の突出長さ（Ｌ）と、管体（４０）を挿入した後の突出長さ（Ｌ’）とが異なることを特徴とする請求項第１項記載の管継手構造。The projecting length (L) of the inner collar (8) before inserting the tube (40) is different from the projecting length (L ') after inserting the tube (40). Item 2. The pipe joint structure according to Item 1.