JP6486657B2

JP6486657B2 - Pipe joint structure

Info

Publication number: JP6486657B2
Application number: JP2014229947A
Authority: JP
Inventors: 俊志 ▲高▼城; 信秋小野; 敏彦齋藤
Original assignee: 株式会社Ｔｆｔ
Priority date: 2014-11-12
Filing date: 2014-11-12
Publication date: 2019-03-20
Anticipated expiration: 2034-11-12
Also published as: JP2016094964A

Description

本発明は管の継手構造、特に、互いに接合される一対の管同士の管軸回りの相対的な回転を可能にする管の継手構造に関する。 The present invention relates to a pipe joint structure, and more particularly to a pipe joint structure that enables relative rotation around a pipe axis between a pair of pipes joined to each other.

従来、一対の管を接合する管の継手構造として所謂「ネジ継手」が広く知られているが、ネジ継手は、一方の管の端部に雄ネジを形成し、他方の管の端部に雌ネジを形成し、雄ネジと雌ネジとを螺合するものである。したがって、接合が容易であるものの、振動によって螺合が弛むおそれがあるという問題や、一対の管同士を管軸回りに相対的に回転することができないという問題があった。
そこで、接合作業が容易で、一対の管同士が相対的に回転自在な構造が提供されている（例えば、特許文献１参照）。 Conventionally, a so-called “threaded joint” is widely known as a joint structure for joining a pair of pipes, but a threaded joint is formed with a male thread at the end of one pipe and at the end of the other pipe. A female screw is formed, and a male screw and a female screw are screwed together. Therefore, although joining is easy, there existed a problem that there exists a possibility that screwing may loosen by vibration, and the problem that a pair of pipes cannot be rotated relatively around a pipe axis.
Therefore, a structure is provided in which joining work is easy and a pair of tubes are relatively rotatable (see, for example, Patent Document 1).

特開２００４−１９０７５８号公報（第４−５頁、図１）JP 2004-190758 A (page 4-5, FIG. 1)

特許文献１に開示された発明は、外周溝を具備する接合雄ソケットが一方の管に形成され、内周溝を具備する接合雌ソケットが他方の管に形成され、接合雄ソケットが接合雌ソケットに挿入された際、外周溝と内周溝とが合致することによって形成される環状溝に、径方向に弾性変形可能な係止部材が介装されるものである。そして、環状溝を複数にして、環状溝のそれぞれに係止部材を介装するために、接合雌ソケットの内周溝の本体寄り（管端から離れた側）に傾斜面を形成して、接合雄ソケットが接合雌ソケットに挿入される際、係止部材は傾斜面に摺動して収径するようになっている。 In the invention disclosed in Patent Document 1, a joined male socket having an outer peripheral groove is formed on one pipe, a joined female socket having an inner peripheral groove is formed on the other pipe, and the joined male socket is a joined female socket. A locking member that is elastically deformable in the radial direction is interposed in an annular groove formed when the outer peripheral groove and the inner peripheral groove are matched with each other. And in order to interpose the locking member in each of the annular grooves by forming a plurality of annular grooves, an inclined surface is formed near the main body (side away from the tube end) of the inner peripheral groove of the joint female socket, When the joining male socket is inserted into the joining female socket, the locking member slides on the inclined surface so as to have a diameter.

したがって、接合雄ソケットを接合雌ソケットから引き抜こうとすると、係止部材は外周溝の管端寄りの面と内周溝の管端寄りの面とに係止して、両者の接合は維持される。
一方、接合雄ソケットを接合雌ソケット内に押し込もうとすると、係止部材は外周溝の本体寄りの面に係止し、内周溝の本体寄りに形成された傾斜面に摺動することから、係止部材は収径する。そうすると、押し込み量を規制する手段が必要になるから、接合雄ソケットの外周に段差部（ショルダー）を設け、かかる段差部に接合雌ソケットの先端が当接するようにしている。また、接合雌ソケットの内周に段差部（ショルダー）を設け、かかる段差部に接合雄ソケットの先端が当接するようにしている。
そのため、接合雄ソケットの外周溝が形成される範囲の肉厚と、接合雌ソケットの内周溝が形成される範囲の肉厚とが、薄くなり、接合強度が低下するという問題があった。 Therefore, when the joining male socket is pulled out from the joining female socket, the engaging member is engaged with the surface near the tube end of the outer peripheral groove and the surface near the tube end of the inner peripheral groove, and the connection between the two is maintained. .
On the other hand, when the joined male socket is pushed into the joined female socket, the locking member is locked to the surface of the outer peripheral groove closer to the main body and slides on the inclined surface formed closer to the inner peripheral groove of the main body. Therefore, the diameter of the locking member is reduced. Then, since a means for regulating the pushing amount is required, a step portion (shoulder) is provided on the outer periphery of the joint male socket, and the tip of the joint female socket is in contact with the step portion. Further, a stepped portion (shoulder) is provided on the inner periphery of the joined female socket so that the tip of the joined male socket contacts the stepped portion.
Therefore, the thickness in the range where the outer peripheral groove of the bonded male socket is formed and the thickness in the range where the inner peripheral groove of the bonded female socket are formed are thin, and there is a problem that the bonding strength is lowered.

本発明は上記問題を解決するものであって、複数の外周溝が形成された一方の管と、複数の内周溝が形成された一方の管とを、複数の係止部材によって容易に接合することを可能にすると共に、段差部（ショルダー）を不要にする管の継手構造を提供するものである。 The present invention solves the above-mentioned problem, and easily joins one pipe formed with a plurality of outer circumferential grooves and one pipe formed with a plurality of inner circumferential grooves by a plurality of locking members. It is possible to provide a joint structure for a pipe that makes it possible to eliminate the need for a stepped portion (shoulder).

（１）本発明に係る管の継手構造は、管端部の外周面に本体寄り外周溝および管端寄り外周溝が形成された雄管と、前記雄管の外周面が侵入自在な管端部の内周面を具備し、該内周面に管端寄り内周溝および本体寄り内周溝が形成された雌管とが、拡縮自在な第１係止部材および拡縮自在な第２係止部材によって接合された管の継手構造であって、
前記第１係止部材は、前記本体寄り外周溝に侵入可能および管端寄り内周溝に係止可能であり、前記第２係止部材は、前記管端寄り外周溝に侵入可能および本体寄り内周溝に係止可能で、管端寄り内周溝に係止不可能であり、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の相違する位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の相違する位置にあり、少なくとも前記第２係止部材は、前記雌管の管端部の内周面に当接して縮径され、前記管端寄り外周溝に押し込められ、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の同じ位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の同じ位置にあり、前記第１係止部材は弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材は弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止し、
前記管端寄り外周溝の管端寄りに、前記管端寄り外周溝の深さより浅い深さの管端寄り外周浅溝が形成され、前記本体寄り外周溝の管端寄りに、前記本体寄り外周溝の深さより浅い深さの本体寄り外周浅溝が形成され、
前記第１係止部材が弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材が弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止した状態で、前記雄管を前記雌管から引き離す力が作用した際、前記第１係止部材は管軸方向に移動されて、前記本体寄り外周浅溝と前記管端寄り内周溝との間に引き込まれ、且つ、前記第２係止部材は管軸方向に移動されて、前記管端寄り外周浅溝と前記本体寄り内周溝との間に引き込まれることを特徴とする。 (1) The pipe joint structure according to the present invention includes a male pipe having an outer peripheral groove closer to the main body and an outer peripheral groove closer to the pipe end formed on the outer peripheral surface of the pipe end, and a pipe end into which the outer peripheral surface of the male pipe can enter. And a female pipe having an inner peripheral groove near the tube end and an inner peripheral groove near the main body formed on the inner peripheral surface, and a first locking member that can be expanded and contracted and a second engagement that can be expanded and contracted A joint structure of pipes joined by a stop member,
The first locking member can enter the outer peripheral groove near the main body and can lock into the inner peripheral groove near the pipe end, and the second locking member can enter the outer peripheral groove near the pipe end and close to the main body. It can be locked in the inner circumferential groove and cannot be locked in the inner circumferential groove near the pipe end.
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are located at different positions in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are It is in a position different in the axial direction, and at least the second locking member is reduced in diameter in contact with the inner peripheral surface of the tube end of the female tube, and is pushed into the outer peripheral groove near the tube end,
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are at the same position in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastic. Restore and lock across the outer circumferential groove near the pipe end and the inner circumferential groove near the main body ,
Near the pipe end of the outer peripheral groove near the pipe end, an outer peripheral shallow groove near the pipe end having a depth shallower than the depth of the outer peripheral groove near the pipe end is formed. A shallow groove near the body with a depth shallower than the depth of the groove is formed,
The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastically restored and close to the pipe end. When the force that pulls the male tube away from the female tube is applied in a state of being locked across the outer peripheral groove and the inner peripheral groove closer to the main body, the first locking member is moved in the tube axis direction, The outer peripheral shallow groove near the main body and the inner peripheral groove near the pipe end are pulled in, and the second locking member is moved in the tube axis direction so that the outer peripheral shallow groove near the pipe end and the inner peripheral groove It is drawn in between the circumferential grooves .

（２）また、管端部の外周面に本体寄り外周溝および管端寄り外周溝が形成された雄管と、前記雄管の外周面が侵入自在な管端部の内周面を具備し、該内周面に管端寄り内周溝および本体寄り内周溝が形成された雌管とが、拡縮自在な第１係止部材および拡縮自在な第２係止部材によって接合された管の継手構造であって、
前記第１係止部材は、前記本体寄り外周溝に侵入可能および管端寄り内周溝に係止可能であり、前記第２係止部材は、前記管端寄り外周溝に侵入可能および本体寄り内周溝に係止可能で、管端寄り内周溝に係止不可能であり、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の相違する位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の相違する位置にあり、少なくとも前記第２係止部材は、前記雌管の管端部の内周面に当接して縮径され、前記管端寄り外周溝に押し込められ、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の同じ位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の同じ位置にあり、前記第１係止部材は弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材は弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止し、
前記管端寄り外周溝の本体寄りに、前記管端寄り外周溝の深さより浅い深さの管端寄り外周浅溝が形成され、前記本体寄り外周溝の本体寄りに、前記本体寄り外周溝の深さより浅い深さの本体寄り外周浅溝が形成され、
前記第１係止部材が弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材が弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止した状態で、前記雄管を前記雌管に押し込む力が作用した際、前記第１係止部材は管軸方向に移動されて、前記本体寄り外周浅溝と前記管端寄り内周溝との間に押し込められ、且つ、前記第２係止部材は管軸方向に移動されて、前記管端寄り外周浅溝と前記本体寄り内周溝との間に押し込められることを特徴とする。
（３）さらに、前記雌管は、管端部が拡径され、管端部の肉厚が本体部の肉厚とは略同じであることを特徴とする。 (2) A male pipe having an outer peripheral groove near the main body and an outer peripheral groove near the pipe end formed on the outer peripheral surface of the pipe end portion, and an inner peripheral surface of the pipe end portion into which the outer peripheral surface of the male pipe can enter. And a female pipe having an inner peripheral groove near the pipe end and an inner peripheral groove closer to the main body formed on the inner peripheral surface of the pipe joined by a first locking member that can be expanded and contracted and a second locking member that can be expanded and contracted. A joint structure,
The first locking member can enter the outer peripheral groove near the main body and can lock into the inner peripheral groove near the pipe end, and the second locking member can enter the outer peripheral groove near the pipe end and close to the main body. It can be locked in the inner circumferential groove and cannot be locked in the inner circumferential groove near the pipe end.
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are located at different positions in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are It is in a position different in the axial direction, and at least the second locking member is reduced in diameter in contact with the inner peripheral surface of the tube end of the female tube, and is pushed into the outer peripheral groove near the tube end,
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are at the same position in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastic. Restore and lock across the outer circumferential groove near the pipe end and the inner circumferential groove near the main body,
Near the main body of the outer peripheral groove near the pipe end, a shallow outer peripheral groove near the pipe end, which is shallower than the depth of the outer peripheral groove near the pipe end, is formed near the main body of the outer peripheral groove near the main body. A shallow groove near the main body with a depth shallower than the depth is formed,
The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastically restored and close to the pipe end. When the force for pushing the male tube into the female tube is applied in a state of being locked across the outer peripheral groove and the inner peripheral groove closer to the main body, the first locking member is moved in the tube axis direction, The outer peripheral shallow groove near the main body and the inner peripheral groove near the pipe end are pushed in, and the second locking member is moved in the tube axis direction so that the outer peripheral shallow groove near the pipe end and the inner peripheral groove It is characterized by being pushed in between the circumferential grooves.
(3) Further, the female pipe is characterized in that the diameter of the pipe end is expanded, and the thickness of the pipe end is substantially the same as the thickness of the main body.

（ｉ）本発明に係る管の継手構造は、第２係止部材が管端寄り内周溝に係止不可能であるから、雄管の管端部が雌管の管端部に侵入する過程において、管端寄り内周溝の位置と管端寄り外周溝の位置とが一致したとしても、第２係止部材は雌管の内周に押さえられて拡径することはなく、管端寄り内周溝に係止することがない。したがって、雄管を雌管の奥にさらに侵入させることができる。
すなわち、管端寄り内周溝には第２係止部材を乗り越えるための傾斜面が不要であるから、管端寄り内周溝および本体寄り外周面に係止する第１係止部材と、本体寄り内周溝および管端寄り外周面に係止する第２係止部材とによって、雄管と雌管とは、管軸方向に引き抜き不能および管軸方向に押し込み不能になっている。
また、第１係止部材および第２係止部材は管軸に垂直な面に平行であるから、雄管と雌管とは管軸回りに相対的に回転可能である。
このとき、雄管と雌管との接合は容易であると共に、雄管または雌管に段差部（ショルダー）を形成する必要がないから、管端寄り外周溝等および管端寄り内周溝等が形成される範囲の肉厚が薄くなることがなく、接合強度が低下することがない。 (I) In the pipe joint structure according to the present invention, since the second locking member cannot be locked in the inner circumferential groove near the pipe end, the pipe end of the male pipe enters the pipe end of the female pipe. In the process, even if the position of the inner peripheral groove near the tube end and the position of the outer peripheral groove near the tube end coincide with each other, the second locking member is not pressed and expanded by the inner periphery of the female tube. It is not locked to the inner circumferential groove. Therefore, the male tube can be further penetrated into the back of the female tube.
That is, since the inner peripheral groove near the pipe end does not need an inclined surface for getting over the second locking member, the first locking member locked to the inner peripheral groove closer to the pipe end and the outer peripheral surface closer to the main body, and the main body The male tube and the female tube cannot be pulled out in the tube axis direction and cannot be pushed in the tube axis direction by the second inner locking groove and the second locking member locked to the outer peripheral surface near the tube end.
In addition, since the first locking member and the second locking member are parallel to the plane perpendicular to the tube axis, the male tube and the female tube can be relatively rotated around the tube axis.
At this time, it is easy to join the male pipe and the female pipe, and it is not necessary to form a stepped portion (shoulder) on the male pipe or the female pipe. As a result, the thickness in the range in which the film is formed is not reduced, and the bonding strength is not reduced.

（ｉｉ）また、雄管を雌管から引き離す力が作用した際、第１係止部材は本体寄り外周浅溝と管端寄り内周溝との間に引き込まれ、且つ、第２係止部材は管端寄り外周浅溝と本体寄り内周溝との間に引き込まれるから、第１係止部材および第２係止部材は、狭い隙間に保持されることになる。よって、雄管の管軸と雌管の管軸とが平行でなくなったり（折れ曲がったり）、平行であっても、離れたりすることが抑えられ、両者がより正確に一致する。
（ｉｉｉ）また、雄管を雌管に押し込む力が作用した際、第１係止部材は本体寄り外周押し溝と管端寄り内周溝との間に押し込まれ、且つ、第２係止部材は管端寄り外周押し溝と本体寄り内周溝との間に押し込まれるから、第１係止部材および第２係止部材は、狭い隙間に保持されることになる。よって、雄管の管軸と雌管の管軸とが平行でなくなったり（折れ曲がったり）、平行であっても、離れたりすることが抑えられ、両者がより正確に一致する。
（ｉｖ）さらに、前記雌管は、管端部が拡径され、管端部の肉厚が本体部の肉厚とは略同じであるから、先端寄り内周溝における肉厚および本体寄り内周溝における肉厚の、減少を抑えることができる。 (Ii) When a force for pulling the male tube away from the female tube is applied, the first locking member is pulled between the outer peripheral shallow groove near the main body and the inner peripheral groove near the tube end, and the second locking member Is pulled between the outer peripheral shallow groove near the pipe end and the inner peripheral groove near the main body, the first locking member and the second locking member are held in a narrow gap. Therefore, the tube axis of the male tube and the tube axis of the female tube are not parallel (bent) or separated even if they are parallel, so that they are more accurately matched.
(Iii) When a force for pushing the male tube into the female tube is applied, the first locking member is pushed between the outer peripheral push groove closer to the main body and the inner peripheral groove closer to the pipe end, and the second locking member Is pushed between the outer peripheral push groove closer to the tube end and the inner peripheral groove closer to the main body, the first locking member and the second locking member are held in a narrow gap. Therefore, the tube axis of the male tube and the tube axis of the female tube are not parallel (bent) or separated even if they are parallel, so that they are more accurately matched.
(Iv) Further, the female tube has a tube end portion whose diameter is increased, and the wall thickness of the tube end portion is substantially the same as the wall thickness of the main body portion. A reduction in the wall thickness in the circumferential groove can be suppressed.

本発明の実施の形態１に係る管の継手構造を説明する接合完了時の側面視の断面図。Sectional drawing of the side view at the time of the completion of joining explaining the joint structure of the pipe | tube which concerns on Embodiment 1 of this invention. 図１に示す管の継手構造を説明するものであって、（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図。FIG. 2 illustrates the joint structure of the pipe shown in FIG. 1, (a) is an enlarged cross-sectional view in a side view in the middle of joining and shows a part enlarged, and (b) is a joint completion shown in part enlarged. The expanded sectional view of the side view at the time. 本発明の実施の形態２に係る管の継手構造を説明する接合完了時の側面視の断面図。Sectional drawing of the side view at the time of the completion of joining explaining the joint structure of the pipe | tube which concerns on Embodiment 2 of this invention. 図３に示す管の継手構造を説明するものであって、（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図、（ｃ）は一部を拡大して示す引き離し力が作用したときの側面視の断面図。3A and 3B illustrate a joint structure of the pipe illustrated in FIG. 3, in which FIG. 3A is an enlarged cross-sectional view in a side view in the middle of joining, and FIG. The expanded sectional view of the side view at the time, (c) is the sectional view of the side view when the pulling-off force shown by enlarging a part is applied. 本発明の実施の形態３に係る管の継手構造を説明する接合完了時の側面視の断面図。Sectional drawing of the side view at the time of the completion of joining explaining the joint structure of the pipe | tube which concerns on Embodiment 3 of this invention. 図５に示す管の継手構造を説明するものであって、（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図、（ｃ）は一部を拡大して示す押し込み力が作用したときの側面視の断面図。FIG. 6 illustrates the joint structure of the pipe shown in FIG. 5, (a) is an enlarged cross-sectional view in a side view in the middle of joining, showing a part enlarged, and (b) is a joining completion shown in part enlarged. An enlarged sectional view of the side view at the time, (c) is a sectional view of the side view when a pressing force acting on an enlarged part is applied. 本発明の実施の形態４に係る管の継手構造を説明するものであって、（ａ）は接合完了時の側面視の断面図、（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図。It explains the joint structure of the pipe concerning Embodiment 4 of the present invention, and (a) is a sectional view of side view at the time of completion of joining, and (b) at the time of completion of joining shown partially enlarged. The expanded sectional view of a side view. 図７に示す管の継手構造を説明するものであって、（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、（ｂ）は一部を拡大して示す引き離し力が作用したときの側面視の断面図、（ｃ）は一部を拡大して示す押し込み力が作用したときの側面視の断面図。FIG. 8 illustrates a joint structure of the pipe illustrated in FIG. 7, wherein (a) is an enlarged cross-sectional view in a side view in the middle of joining, and (b) is a pulling force that is partially enlarged. Sectional drawing of the side view when (2) act | operates, (c) is sectional drawing of the side view when the pushing force which expands and shows a part acts.

［実施の形態１］
図１および図２は本発明の実施の形態１に係る管の継手構造を説明するものであって、図１は接合完了時の側面視の断面図、図２の（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、図２の（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図である。なお、各部は模式的に示すものであって、本発明は図示された形態（形状や相対的な大きさ等）に限定されるものではない。また、各図において、一部の部材または一部の部位については、これを示す符号の記載を省略している。 [Embodiment 1]
1 and 2 illustrate a joint structure of a pipe according to Embodiment 1 of the present invention. FIG. 1 is a cross-sectional view in side view when joining is completed, and FIG. FIG. 2B is an enlarged cross-sectional view in side view at the time of completion of joining shown in a partially enlarged view. In addition, each part is shown typically and this invention is not limited to the form (shape, relative magnitude | size, etc.) shown in figure. Moreover, in each figure, about the one part member or one part site | part, the description of the code | symbol which shows this is abbreviate | omitted.

（管の継手構造）
図１および図２の（ｂ）において、管の継手構造１００は、雄管１０と雌管２０とが弾性係止部材（以下「クリップ」と称す）３０によって接合されたものである。
雄管１０の管端１０ｂに近い外周面１０ｃにおいて、管端１０ｂ寄りに管端寄り外周溝１２が形成され、管端寄り外周溝１２よりも管端１０ｂから離れた位置（以下、「本体寄り」と称す）に本体寄り外周溝１１が形成され、管端１０ｂと外周面１０ｃとの角部に、面取り部１０ｅが設けられている。
また、雌管２０の管端２０ａに近い内周面２０ｄに、管端２０ａ寄りの位置に管端寄り内周溝２１が形成され、管端寄り内周溝２１よりも管端１０ｂから離れた位置（以下、「本体寄り」と称す）に本体寄り内周溝２１が形成され、管端２０ａと内周面２０ｄとの角部に、面取り部２０ｅが設けられている。
そして、クリップ３０は第１クリップ３１および第２クリップ３２を総称したものであって、第１クリップ３１は本体寄り外周溝１１と管端寄り内周溝２１とによって形成された環状の第１空間９１に設置され、第２クリップ３２は管端寄り外周溝１２と本体寄り内周溝２２とによって形成された環状の第２空間９２に設置されている。 (Pipe joint structure)
In FIG. 1 and FIG. 2B, a pipe joint structure 100 is obtained by joining a male pipe 10 and a female pipe 20 by an elastic locking member (hereinafter referred to as “clip”) 30.
On the outer peripheral surface 10c of the male pipe 10 near the pipe end 10b, a pipe end-side outer peripheral groove 12 is formed near the pipe end 10b, and a position farther from the pipe end 10b than the pipe end-side outer peripheral groove 12 (hereinafter referred to as “main body side”). The outer peripheral groove 11 closer to the main body is formed, and a chamfered portion 10e is provided at the corner between the pipe end 10b and the outer peripheral surface 10c.
Further, an inner peripheral groove 21 near the pipe end is formed on the inner peripheral surface 20d near the pipe end 20a of the female pipe 20 at a position near the pipe end 20a, and is farther from the pipe end 10b than the inner peripheral groove 21 near the pipe end. A body-side inner circumferential groove 21 is formed at a position (hereinafter referred to as “body-side”), and a chamfered portion 20e is provided at a corner between the pipe end 20a and the inner circumferential surface 20d.
The clip 30 is a generic term for the first clip 31 and the second clip 32, and the first clip 31 is an annular first space formed by the outer peripheral groove 11 near the main body and the inner peripheral groove 21 near the pipe end. The second clip 32 is installed in an annular second space 92 formed by the outer peripheral groove 12 near the pipe end and the inner peripheral groove 22 near the main body.

（雄管）
本体寄り外周溝１１は雄管１０の管軸に垂直な面（何れも図示しない）に平行な本体寄り外周溝側面１１ａおよび本体寄り外周溝側面１１ｂと、本体寄り外周溝側面１１ａと本体寄り外周溝側面１１ｂとの間に形成された本体寄り外周溝底面１１ｃと、を具備する断面矩形状である。なお、本体寄り外周溝底面１１ｃと外周面１０ｃとの距離（深さ）を本体寄り外周溝深さ１１ｔと称す。
管端寄り外周溝１２は雄管１０の管軸に垂直な面（何れも図示しない）に平行な管端寄り外周溝側面１２ａおよび管端寄り外周溝側面１２ｂと、管端寄り外周溝側面１２ａと管端寄り外周溝側面１２ｂとの間に形成された管端寄り外周溝底面１２ｃと、を具備する断面矩形状である。なお、管端寄り外周溝底面１２ｃと外周面１０ｃとの距離（深さ）を管端寄り外周溝深さ１２ｔと称す。
このとき、本体寄り外周溝側面１１ａと本体寄り外周溝側面１１ｂとの間隔（以下「本体寄り外周溝幅」と称す）１１ｘは、管端寄り外周溝側面１２ａと管端寄り外周溝側面１２ｂとの間隔（以下「管端寄り外周溝幅」と称す）１２ｘよりも狭い。 (Male pipe)
The main body-side outer peripheral groove 11 includes a main body-side outer peripheral groove side surface 11a and a main body-side outer peripheral groove side surface 11b that are parallel to a surface perpendicular to the tube axis of the male pipe 10 (both not shown), and the main body-side outer peripheral groove side surface 11a It is a cross-sectional rectangle shape which comprises the body side outer periphery groove bottom face 11c formed between the groove side faces 11b. The distance (depth) between the main body side outer peripheral groove bottom surface 11c and the outer peripheral surface 10c is referred to as the main body side outer peripheral groove depth 11t.
The outer peripheral groove 12 near the pipe end is an outer peripheral groove side face 12a near the pipe end parallel to a surface perpendicular to the tube axis of the male pipe 10 (both not shown), an outer peripheral groove side face 12b near the pipe end, and an outer peripheral groove side face 12a near the pipe end. And a tube end-side outer peripheral groove bottom surface 12c formed between the tube end-side outer peripheral groove side surface 12b. The distance (depth) between the outer peripheral groove bottom surface 12c near the pipe end and the outer peripheral surface 10c is referred to as the outer peripheral groove depth 12t near the pipe end.
At this time, an interval 11x between the main body side outer peripheral groove side surface 11a and the main body side outer peripheral groove side surface 11b (hereinafter referred to as "main body side outer peripheral groove side width") is defined as follows. The interval (hereinafter referred to as “peripheral groove width near the pipe end”) 12x is narrower.

（雌管）
管端寄り内周溝２１は雌管２０の管軸に垂直な面（何れも図示しない）に平行な管端寄り内周溝側面２１ａおよび管端寄り内周溝側面２１ｂと、管端寄り内周溝側面２１ａと管端寄り内周溝側面２１ｂとの間に形成された管端寄り内周溝底面２１ｄと、を具備する断面矩形状である。なお、管端寄り内周溝底面２１ｄと内周面２０ｄとの距離（深さ）を管端寄り内周溝深さ２１ｔと称す。
本体寄り内周溝２２は雌管２０の管軸に垂直な面（何れも図示しない）に平行な本体寄り内周溝側面２２ａおよび本体寄り内周溝側面２２ｂと、本体寄り内周溝側面２２ａと本体寄り内周溝側面２２ｂとの間に形成された本体寄り内周溝底面２２ｄと、を具備する断面矩形状である。なお、本体寄り内周溝底面２２ｄと内周面２０ｄとの距離（深さ）を本体寄り内周溝深さ２２ｔと称す。
このとき、管端寄り内周溝側面２１ａと管端寄り内周溝側面２１ｂとの間隔（以下「管端寄り内周溝幅」と称す）２１ｘは、本体寄り内周溝側面２２ａと本体寄り内周溝側面２２ｂとの間隔（以下「本体寄り内周溝幅」と称す）２２ｘより小さい（狭い）。 (Female tube)
The inner circumferential groove 21 near the pipe end includes an inner circumferential groove side surface 21a near the pipe end and an inner circumferential groove side surface 21b near the pipe end parallel to a plane perpendicular to the tube axis of the female pipe 20 (both not shown), It has a rectangular cross section including a tube end-side inner peripheral groove bottom surface 21d formed between the peripheral groove side surface 21a and the tube end-side inner peripheral groove side surface 21b. The distance (depth) between the inner peripheral groove bottom surface 21d near the pipe end and the inner peripheral surface 20d is referred to as an inner peripheral groove depth 21t near the pipe end.
The main body-side inner peripheral groove 22 includes a main body-side inner peripheral groove side surface 22a and a main body-side inner peripheral groove side surface 22b that are parallel to a surface perpendicular to the tube axis of the female tube 20 (not shown), and a main body-side inner peripheral groove side surface 22a. And a main body side inner peripheral groove bottom surface 22d formed between the main body side inner peripheral groove side surface 22b. The distance (depth) between the inner peripheral groove bottom surface 22d and the inner peripheral surface 20d is referred to as the main body inner groove depth 22t.
At this time, the distance between the inner peripheral groove side surface 21a near the pipe end and the inner peripheral groove side surface 21b near the pipe end (hereinafter referred to as “the inner peripheral groove width near the pipe end”) 21x is close to the inner peripheral groove side surface 22a closer to the main body. The distance from the inner circumferential groove side surface 22b (hereinafter referred to as “the inner circumferential groove width near the main body”) is smaller than 22x (narrow).

（第１空間、第２空間）
そして、本体寄り外周溝幅１１ｘと管端寄り内周溝幅２１ｘとは略同じ値で、管端寄り外周溝幅１２ｘと本体寄り内周溝幅２２ｘとは略同じ値である。
さらに、本体寄り外周溝側面１１ａと管端寄り外周溝側面１２ａとの距離（以下「外周溝間隔」と称す）１０ｙは、管端寄り内周溝側面２１ａと本体寄り内周溝側面２２ａとの距離（以下「内周溝間隔」と称す）２０ｙと略同じ値である（図２の（ｂ）参照）。
したがって、本体寄り外周溝１１と管端寄り内周溝２１とが、管軸方向の同じ位置にあって、両者によって第１空間９１が形成されたとき、管端寄り外周溝１２と本体寄り内周溝２２とは、管軸方向の同じ位置になり、両者によって第２空間９２が形成されることになる。 (First space, second space)
The outer peripheral groove width 11x closer to the main body and the inner peripheral groove width 21x closer to the pipe end are substantially the same value, and the outer peripheral groove width 12x closer to the pipe end and the inner peripheral groove width 22x closer to the main body are substantially the same value.
Further, the distance 10y between the outer peripheral groove side surface 11a closer to the main body and the outer peripheral groove side surface 12a closer to the pipe end (hereinafter referred to as "outer peripheral groove interval") 10y is the distance between the inner peripheral groove side surface 21a closer to the pipe end and the inner peripheral groove side surface 22a closer to the main body. The distance (hereinafter referred to as “inner peripheral groove interval”) 20y is substantially the same value (see FIG. 2B).
Therefore, when the outer peripheral groove 11 near the main body and the inner peripheral groove 21 near the pipe end are in the same position in the pipe axis direction and the first space 91 is formed by both, the outer peripheral groove 12 near the pipe end and the inner groove near the main body are formed. The circumferential groove 22 is at the same position in the tube axis direction, and the second space 92 is formed by both.

（第１クリップ、第２クリップ）
図２の（ａ）において、第１クリップ３１および第２クリップ３２は何れも、断面矩形状で、一部が欠損した円管（Ｃ字状）であって、拡径自在および縮径自在な弾性体である。
すなわち、第１クリップ３１は、互いに平行な第１クリップ端面３１ａ、３１ｂと、第１クリップ外周面３１ｃと、第１クリップ内周面３１ｄと、を具備している。このとき、第１クリップ端面３１ａと第１クリップ端面３１ｂとの距離を第１クリップ幅３１ｘと称し、第１クリップ外周面３１ｃと第１クリップ内周面３１ｄとの距離を第１クリップ厚さ３１ｔと称す。そして、第１クリップ厚さ３１ｔは、本体寄り外周溝深さ１１ｔより小さく、管端寄り内周溝深さ２１ｔよりも大きい。
同様に、第２クリップ３２は、互いに平行な第２クリップ端面３２ａ、３２ｂと、第２クリップ外周面３２ｃと、第２クリップ内周面３２ｄと、を具備している。このとき、第２クリップ端面３２ａと第２クリップ端面３２ｂとの距離を第２クリップ幅３２ｘと称し、第２クリップ外周面３２ｃと第２クリップ内周面３２ｄとの距離を第２クリップ厚さ３２ｔと称す。そして、第２クリップ厚さ３２ｔは管体寄り外周溝深さ１２ｔより小さく、本体寄り内周溝深さ２２ｔよりも大きい。
さらに、第１クリップ内周面３１ｄの内径および第２クリップ内周面３２ｄの内径は、雄管１０の外周面１０ｃの外径よりも小さく、第１クリップ外周面３１ｃの外径および第２クリップ外周面３２ｃの外径は、雌管２０の内周面２０ｄの内径よりも大きく形成されている。
さらに、第１クリップ幅３１ｘは本体寄り外周溝幅１１ｘ（管端寄り内周溝幅２１ｘに同じ）よりも僅かに小さく、第２クリップ幅３２ｘは管端寄り外周溝幅１２ｘ（本体寄り内周溝幅２２ｘに同じ）よりも僅かに小さくなっている。 (1st clip, 2nd clip)
In FIG. 2A, each of the first clip 31 and the second clip 32 is a circular tube (C-shaped) having a rectangular cross section and a part of which is missing. It is an elastic body.
That is, the first clip 31 includes first clip end surfaces 31a and 31b, a first clip outer peripheral surface 31c, and a first clip inner peripheral surface 31d that are parallel to each other. At this time, the distance between the first clip end surface 31a and the first clip end surface 31b is referred to as a first clip width 31x, and the distance between the first clip outer peripheral surface 31c and the first clip inner peripheral surface 31d is the first clip thickness 31t. Called. The first clip thickness 31t is smaller than the outer peripheral groove depth 11t closer to the main body and larger than the inner peripheral groove depth 21t closer to the pipe end.
Similarly, the second clip 32 includes second clip end faces 32a and 32b that are parallel to each other, a second clip outer peripheral face 32c, and a second clip inner peripheral face 32d. At this time, the distance between the second clip end surface 32a and the second clip end surface 32b is referred to as a second clip width 32x, and the distance between the second clip outer peripheral surface 32c and the second clip inner peripheral surface 32d is the second clip thickness 32t. Called. The second clip thickness 32t is smaller than the outer circumferential groove depth 12t near the tube and larger than the inner circumferential groove depth 22t near the main body.
Further, the inner diameter of the first clip inner peripheral surface 31d and the inner diameter of the second clip inner peripheral surface 32d are smaller than the outer diameter of the outer peripheral surface 10c of the male tube 10, and the outer diameter of the first clip outer peripheral surface 31c and the second clip The outer diameter of the outer peripheral surface 32 c is formed larger than the inner diameter of the inner peripheral surface 20 d of the female tube 20.
Further, the first clip width 31x is slightly smaller than the outer peripheral groove width 11x closer to the main body (the same as the inner peripheral groove width 21x closer to the pipe end), and the second clip width 32x is the outer peripheral groove width 12x closer to the pipe end (the inner peripheral groove closer to the main body). It is slightly smaller than the groove width 22x.

（接合）
図２の（ａ）において、管の継手構造１００は以上の構成であるから、以下の要領で、雄管１０と雌管２０とをクリップ３０によって接合する。
まず、第２クリップ３２を、拡径して（弾性変形させて）、外周面１０ｃに差し込み、管端寄り外周溝１２の位置において弾性変形を復元（以下「弾性復元」と称す）させることにより管端寄り外周溝１２に係止する。同様に、第１クリップ３１を、拡径して雄管１０の外周面１０ｃに差し込み、本体寄り外周溝１１の位置において弾性復元させることにより本体寄り外周溝１１に係止する。
次に、雄管１０の外周面１０ｃを雌管２０の内周面２０ｄに挿入する。そうすると、まず、雌管２０の面取り部２０ｅが、第２クリップ外周面３２ｃに当たって第２クリップ３２を縮径し、内周面２０ｄが、第２クリップ３２を管端寄り外周溝１２内に押し込む。このとき、第２クリップ厚さ３２ｔは管端寄り外周溝深さ１２ｔより小さいから、第２クリップ内周面３２ｄは、管端寄り外周溝底面１２ｃに当接しない。
そして、管端寄り内周溝幅２１ｘは第２クリップ幅３２ｘよりも短いから、第２クリップ３２が弾性復元して管端寄り内周溝２１に侵入することはないから、管端寄り内周溝２１は管端寄り外周溝１２の位置を通過する（図２の（ａ）参照）。 (Joining)
In FIG. 2A, since the pipe joint structure 100 has the above configuration, the male pipe 10 and the female pipe 20 are joined by the clip 30 in the following manner.
First, the second clip 32 is expanded (elastically deformed), inserted into the outer peripheral surface 10c, and elastic deformation is restored (hereinafter referred to as "elastic recovery") at the position of the outer peripheral groove 12 near the pipe end. Lock to the outer circumferential groove 12 near the tube end. Similarly, the first clip 31 is expanded in diameter and inserted into the outer peripheral surface 10c of the male tube 10, and is elastically restored at the position of the main body side outer peripheral groove 11, thereby being locked to the main body side outer peripheral groove 11.
Next, the outer peripheral surface 10 c of the male tube 10 is inserted into the inner peripheral surface 20 d of the female tube 20. Then, the chamfered portion 20e of the female tube 20 first contacts the second clip outer peripheral surface 32c to reduce the diameter of the second clip 32, and the inner peripheral surface 20d pushes the second clip 32 into the outer peripheral groove 12 near the tube end. At this time, since the second clip thickness 32t is smaller than the outer peripheral groove depth 12t near the tube end, the second clip inner peripheral surface 32d does not contact the outer peripheral groove bottom surface 12c near the tube end.
Since the inner peripheral groove width 21x near the pipe end is shorter than the second clip width 32x, the second clip 32 does not elastically recover and enter the inner peripheral groove 21 near the pipe end. The groove 21 passes through the position of the outer peripheral groove 12 near the pipe end (see FIG. 2A).

やがて、雌管２０の面取り部２０ｅが、第１クリップ外周面３１ｃに当たると、第１クリップ３１は縮径し、内周面２０ｄが、第１クリップ３１を本体寄り外周溝１１内に押し込む。このとき、第１クリップ厚さ３１ｔは本体寄り外周溝深さ１１ｔより小さいから、第１クリップ内周面３１ｄは、本体寄り外周溝底面１１ｃに当接しない。
また、このとき、内周面２０ｄは、第２クリップ３２を管端寄り外周溝１２内に押し込んでいる。
図２の（ｂ）において、さらに、挿入が進んで、管端寄り内周溝２１および本体寄り内周溝２２が、本体寄り外周溝１１および管端寄り外周溝１２の位置にそれぞれ到達すると、第１クリップ３１および第２クリップ３２はそれぞれ弾性復元して、管端寄り内周溝２１および本体寄り内周溝２２に侵入する。このとき、第１クリップ外周面３１ｃは管端寄り内周溝２１の管端寄り内周溝底面２１ｄに当接し、第１クリップ内周面３１ｄは本体寄り外周溝１１内に位置している。また、第２クリップ外周面３２ｃは本体寄り内周溝２２の本体寄り内周溝底面２２ｄに当接し、第２クリップ内周面３２ｄは先端寄り外周溝１２内に位置している。 Eventually, when the chamfered portion 20e of the female tube 20 hits the first clip outer peripheral surface 31c, the first clip 31 is reduced in diameter, and the inner peripheral surface 20d pushes the first clip 31 into the outer peripheral groove 11 closer to the main body. At this time, since the first clip thickness 31t is smaller than the main body side outer peripheral groove depth 11t, the first clip inner peripheral surface 31d does not contact the main body side outer peripheral groove bottom surface 11c.
At this time, the inner peripheral surface 20d pushes the second clip 32 into the outer peripheral groove 12 closer to the pipe end.
In (b) of FIG. 2, when the insertion further proceeds and the inner peripheral groove 21 near the pipe end and the inner peripheral groove 22 near the main body reach the positions of the outer peripheral groove 11 near the main body and the outer peripheral groove 12 near the pipe end, The first clip 31 and the second clip 32 are elastically restored and enter the inner peripheral groove 21 near the pipe end and the inner peripheral groove 22 near the main body. At this time, the first clip outer peripheral surface 31 c abuts on the inner peripheral groove bottom surface 21 d near the tube end of the inner peripheral groove 21 near the tube end, and the first clip inner peripheral surface 31 d is positioned in the outer peripheral groove 11 near the main body. Further, the second clip outer peripheral surface 32c is in contact with the main body-side inner peripheral groove bottom surface 22d of the main body-side inner peripheral groove 22, and the second clip inner peripheral surface 32d is located in the outer peripheral groove 12 near the tip.

したがって、雄管１０を雌管２０に押し込む力が作用すると、第１クリップ端面３１ａは本体寄り外周溝側面１１ａに当接し、第１クリップ端面３１ｂは先端寄り内周溝側面２１ｂとに当接する。また、第２クリップ端面３２ａは先端寄り外周溝側面１２ａに当接し、第２クリップ端面３２ｂは本体寄り内周溝側面２２ｂに当接する。したがって、雄管１０と雌管２０とは軸方向に移動しない。
同様に、雄管１０と雌管２０とを引き離す力が作用すると、第１クリップ端面３１ｂは本体寄り外周溝側面１１ｂに当接し、第１クリップ端面３１ａは先端寄り内周溝側面２１ａとに当接する。また、第２クリップ端面３２ｂは先端寄り外周溝側面１２ｂに当接し、第２クリップ端面３２ａは本体寄り内周溝側面２２ａに当接する。したがって、雄管１０と雌管２０とは軸方向に移動しない。 Therefore, when a force for pushing the male tube 10 into the female tube 20 is applied, the first clip end surface 31a contacts the outer peripheral groove side surface 11a closer to the main body, and the first clip end surface 31b contacts the inner peripheral groove side surface 21b closer to the front end. Further, the second clip end surface 32a abuts on the outer peripheral groove side surface 12a near the tip, and the second clip end surface 32b abuts on the inner peripheral groove side surface 22b near the main body. Therefore, the male tube 10 and the female tube 20 do not move in the axial direction.
Similarly, when a force separating the male tube 10 and the female tube 20 is applied, the first clip end surface 31b comes into contact with the outer peripheral groove side surface 11b closer to the main body, and the first clip end surface 31a contacts the inner peripheral groove side surface 21a closer to the tip. Touch. Further, the second clip end surface 32b contacts the outer peripheral groove side surface 12b closer to the tip, and the second clip end surface 32a contacts the inner peripheral groove side surface 22a closer to the main body. Therefore, the male tube 10 and the female tube 20 do not move in the axial direction.

以上のように、管の継手構造１００は、第１クリップ３１および第２クリップ３２を、それぞれ設置することができ、管軸方向の何れの方向の力に対しても接合が維持される。
また、背景技術のように、段差部（ショルダー）を設ける必要がないため、接合強度の低下を抑えることができる。
なお、以上は、雌管２０の管端部を拡径しているが、本発明はこれに限定するものではなく、雄管１０の管端部を縮径してもよい。
また、以上は、第１クリップ３１および第２クリップ３２が、第１空間９１および第２空間９２にそれぞれ配置されているが、本発明はこれに限定するものではなく、３以上のクリップを、３以上の円管状の空間に配置してもよい。このとき、３以上のクリップの何れかを第１クリップ３１または第２クリップ３２と読み替える。 As described above, in the pipe joint structure 100, the first clip 31 and the second clip 32 can be respectively installed, and the bonding is maintained with respect to any force in the pipe axis direction.
In addition, unlike the background art, it is not necessary to provide a stepped portion (shoulder), so that a reduction in bonding strength can be suppressed.
In addition, although the pipe end part of the female pipe 20 is expanded above, the present invention is not limited to this, and the pipe end part of the male pipe 10 may be reduced in diameter.
Moreover, although the 1st clip 31 and the 2nd clip 32 are each arrange | positioned in the 1st space 91 and the 2nd space 92 as mentioned above, this invention is not limited to this, Three or more clips are included. You may arrange | position in three or more circular tubular spaces. At this time, one of the three or more clips is read as the first clip 31 or the second clip 32.

［実施の形態２］
図３および図４は本発明の実施の形態２に係る管の継手構造を説明するものであって、図３は接合完了時の側面視の断面図、図４の（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、図４の（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図、図４の（ｃ）は一部を拡大して示す引き離し力が作用したときの側面視の断面図である。なお、実施の形態１と同じ部分または相当する部分には同じ符号を付し、一部の説明を省略する。また、各部は模式的に示すものであって、本発明は図示された形態（形状や相対的な大きさ等）に限定されるものではない。さらに、各図において、一部の部材または一部の部位については、これを示す符号の記載を省略している。 [Embodiment 2]
3 and 4 illustrate a pipe joint structure according to Embodiment 2 of the present invention. FIG. 3 is a cross-sectional view in side view upon completion of joining, and FIG. 4B is an enlarged cross-sectional view in side view in the middle of joining, FIG. 4B is an enlarged cross-sectional view in side view at the time of completion of joining shown in FIG. 4B, and FIG. It is sectional drawing of the side view when the pulling-off force shown by this acts. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted. Each part is shown typically and the present invention is not limited to the illustrated form (shape, relative size, etc.). Furthermore, in each figure, the description of the code | symbol which shows this about the one part member or one part site | part is abbreviate | omitted.

（管の継手構造）
図３および図４の（ｂ）において、管の継手構造２００は、雄管４０と雌管２０とが弾性係止部材（以下「クリップ」と称す）３０によって接合されたものであり、雄管４０は本体寄り外周溝１１と管端寄り外周溝１２とに追加して、本体寄り外周浅溝４１と管端寄り外周浅溝４２とを具備するものである。
本体寄り外周浅溝４１は、本体寄り外周溝１１の本体寄り外周溝側面１１ｂに形成されたものであって、本体寄り外周浅溝側面４１ｂとの間に本体寄り外周浅溝底面４１ｃを具備している。このとき、本体寄り外周溝側面１１ｂと本体寄り外周浅溝側面４１ｂとの距離（以下「本体寄り外周浅溝幅」と称す）４１ｘは、本体寄り外周溝幅１１ｘより大きい。
また、本体寄り外周浅溝底面４１ｃと外周面１０ｃとの距離を本体寄り外周浅溝深さ４１ｔと称すると、本体寄り外周浅溝深さ４１ｔと管端寄り内周溝深さ２１ｔとの合計は、第１クリップ厚さ３１ｔよりも小さい。 (Pipe joint structure)
3 and 4B, a pipe joint structure 200 is obtained by joining a male pipe 40 and a female pipe 20 with an elastic locking member (hereinafter referred to as a “clip”) 30. In addition to the outer peripheral groove 11 near the main body and the outer peripheral groove 12 near the pipe end, 40 is provided with an outer peripheral shallow groove 41 near the main body and an outer peripheral shallow groove 42 near the pipe end.
The main body side outer peripheral shallow groove 41 is formed on the main body side outer peripheral groove side surface 11b of the main body side outer peripheral groove 11, and includes a main body side outer peripheral shallow groove bottom surface 41c between the main body side outer peripheral shallow groove side surface 41b. ing. At this time, a distance 41x between the main body side outer peripheral groove side surface 11b and the main body side outer peripheral shallow groove side surface 41b (hereinafter referred to as “main body side outer peripheral shallow groove width”) is larger than the main body side outer peripheral groove side width 11x.
Further, when the distance between the main body side outer peripheral shallow groove bottom surface 41c and the outer peripheral surface 10c is referred to as the main body side outer peripheral shallow groove depth 41t, the total of the main body side outer peripheral shallow groove depth 41t and the pipe end side inner peripheral groove depth 21t is the sum. Is smaller than the first clip thickness 31t.

同様に、管端寄り外周浅溝４２は、管端寄り外周溝１２の管端寄り外周溝側面１２ｂに形成されたものであって、管端寄り外周浅溝側面４２ｂとの間に管端寄り外周浅溝底面４２ｃを具備している。このとき、管端寄り外周溝側面１２ｂと管端寄り外周浅溝側面４２ｂとの距離（以下「管端寄り外周浅溝幅」と称す）４２ｘは、管端寄り外周溝幅１２ｘより小さく、管端寄り外周浅溝底面４２ｃと外周面１０ｃとの距離を管端寄り外周浅溝深さ４２ｔと称すると、管端寄り外周浅溝深さ４２ｔと本体寄り内周溝深さ２２ｔとの合計は、第２クリップ厚さ３２ｔよりも小さい。 Similarly, the outer circumferential shallow groove 42 near the pipe end is formed on the outer circumferential groove side face 12b near the pipe end of the outer circumferential groove 12 near the pipe end, and is closer to the pipe end between the outer circumferential shallow groove side face 42b near the pipe end. An outer peripheral shallow groove bottom surface 42c is provided. At this time, a distance 42x between the outer circumferential groove side surface 12b near the pipe end and the outer circumferential shallow groove side surface 42b near the pipe end (hereinafter referred to as the "outer circumferential shallow groove width" near the pipe end) is smaller than the outer circumferential groove width 12x near the pipe end. When the distance between the bottom outer peripheral shallow groove bottom surface 42c and the outer peripheral surface 10c is referred to as the pipe end outer peripheral shallow groove depth 42t, the sum of the pipe end outer peripheral shallow groove depth 42t and the main body closer inner peripheral groove depth 22t is: The second clip thickness is smaller than 32t.

（接合）
図４の（ａ）において、管の継手構造２００は以上の構成であるから、管の継手構造１００（実施の形態１）と同じ要領で、雄管４０と雌管２０とをクリップ３０によって接合する。すなわち、管端寄り内周溝２１は、管端寄り外周溝１２および管端寄り外周浅溝４２の位置を通過する。
図４の（ｂ）において、挿入が進むと、第１クリップ３１および第２クリップ３２はそれぞれ第１空間９１および第２空間９２内で、弾性復元して、第１クリップ外周面３１ｃは管端寄り内周溝２１の管端寄り内周溝底面２１ｄに当接し、第２クリップ外周面３２ｃは本体寄り内周溝２２の本体寄り内周溝底面２２ｄに当接する。 (Joining)
4A, since the pipe joint structure 200 has the above configuration, the male pipe 40 and the female pipe 20 are joined by the clip 30 in the same manner as the pipe joint structure 100 (Embodiment 1). To do. That is, the inner peripheral groove 21 near the pipe end passes through the positions of the outer peripheral groove 12 near the pipe end and the outer peripheral shallow groove 42 near the pipe end.
In FIG. 4B, when the insertion proceeds, the first clip 31 and the second clip 32 are elastically restored in the first space 91 and the second space 92, respectively, and the first clip outer peripheral surface 31c is the tube end. The inner peripheral groove bottom surface 21d near the pipe end of the inner peripheral groove 21 is in contact with the outer peripheral surface 32c of the second clip.

（引き離し力の作用）
図４の（ｃ）において、雄管４０と雌管２０とを引き離す力が作用すると、第１クリップ端面３１ａに管端寄り内周溝側面２１ａが当接し、第１クリップ３１は本体寄り外周浅溝４１内（本体寄り外周浅溝底面４１ｃと管端寄り内周溝底面２１ｄとの間）に引き込まれ、第１クリップ端面３１ｂは本体寄り外周浅溝側面４１ｂに当接する。また、同時に第２クリップ端面３２ａに本体寄り内周溝側面２２ａが当接し、第２クリップ３２は管端寄り外周浅溝４２内（管端寄り外周浅溝底面４２ｃと本体寄り内周溝底面２２ｄとの間）に引き込まれ、第２クリップ端面３２ｂは管端寄り外周浅溝側面４２ｂに当接する。
このとき、第１クリップ外周面３１ｃは管端寄り内周溝底面２１ｄに当接し、第１クリップ内周面３１ｄは本体寄り外周浅溝底面４１ｃに近接しているから、所謂「ガタ」の無い状態になっている。同様に、第２クリップ外周面３２ｃは本体寄り内周溝底面２２ｄに当接し、第２クリップ内周面３２ｄは管端寄り外周浅溝底面４２ｃに近接しているから、所謂「ガタ」の無い状態になっている。したがって、雄管４０の管軸（図示しない）と雌管２０の管軸（図示しない）とは、両者を引き離す力が作用した際の同軸性が向上する（折れ曲がった状態になり難い）。 (Effect of pulling force)
In FIG. 4C, when a force that separates the male tube 40 and the female tube 20 is applied, the inner peripheral groove side surface 21a near the tube end comes into contact with the first clip end surface 31a, and the first clip 31 is shallower than the main body. The first clip end surface 31b comes into contact with the outer peripheral shallow groove side surface 41b closer to the main body by being pulled into the groove 41 (between the main body closer outer peripheral shallow groove bottom surface 41c and the pipe end closer inner peripheral groove bottom surface 21d). At the same time, the inner peripheral groove side surface 22a near the main body abuts on the second clip end surface 32a, and the second clip 32 is located in the outer peripheral shallow groove 42 near the pipe end (the outer peripheral shallow groove bottom surface 42c near the pipe end and the inner peripheral groove bottom surface 22d near the main body. The second clip end surface 32b comes into contact with the outer peripheral shallow groove side surface 42b near the tube end.
At this time, the first clip outer peripheral surface 31c abuts on the inner peripheral groove bottom surface 21d near the pipe end, and the first clip inner peripheral surface 31d is close to the main body outer peripheral shallow groove bottom surface 41c, so that there is no so-called “backlash”. It is in a state. Similarly, the second clip outer peripheral surface 32c abuts on the inner peripheral groove bottom surface 22d near the main body, and the second clip inner peripheral surface 32d is close to the outer peripheral shallow groove bottom surface 42c near the tube end, so that there is no so-called “backlash”. It is in a state. Therefore, the tube axis (not shown) of the male tube 40 and the tube axis (not shown) of the female tube 20 are improved in coaxiality when a force to separate them is applied (it is difficult to be bent).

［実施の形態３］
図５および図６は本発明の実施の形態３に係る管の継手構造を説明するものであって、図５は接合完了時の側面視の断面図、図６の（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、図６の（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図、図６の（ｃ）は一部を拡大して示す押し込み力が作用したときの側面視の断面図である。なお、実施の形態１と同じ部分または相当する部分には同じ符号を付し、一部の説明を省略する。また、各部は模式的に示すものであって、本発明は図示された形態（形状や相対的な大きさ等）に限定されるものではない。 [Embodiment 3]
5 and 6 illustrate a pipe joint structure according to Embodiment 3 of the present invention. FIG. 5 is a cross-sectional view in side view upon completion of joining, and FIG. 6B is an enlarged cross-sectional view in side view in the middle of joining, FIG. 6B is an enlarged cross-sectional view in side view at the time of completion of joining shown in FIG. 6B, and FIG. It is sectional drawing of the side view when pushing force shown as shown acts. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted. Each part is shown typically and the present invention is not limited to the illustrated form (shape, relative size, etc.).

（管の継手構造）
図５および図６の（ｂ）において、管の継手構造３００は、雄管５０と雌管２０とが弾性係止部材（以下「クリップ」と称す）３０によって接合されたものであり、雄管５０は、雄管４０は本体寄り外周溝１１と管端寄り外周溝１２とに追加して、本体寄り外周浅溝５１と管端寄り外周浅溝５２とを具備するものである。
本体寄り外周浅溝５１は、本体寄り外周溝１１の本体寄り外周溝側面１１ａに形成されたものであって、本体寄り外周浅溝側面５１ａとの間に本体寄り外周浅溝底面５１ｃを具備している。このとき、本体寄り外周溝側面１１ａと本体寄り外周浅溝側面５１ａとの距離（以下「本体寄り外周浅溝幅」と称す）５１ｘは、本体寄り外周溝幅１１ｘより大きい。
また、本体寄り外周浅溝底面５１ｃと外周面１０ｃとの距離を本体寄り外周浅溝深さ５１ｔと称すると、本体寄り外周浅溝深さ５１ｔと管端寄り内周溝深さ２１ｔとの合計は、第１クリップ厚さ３１ｔよりも小さい。 (Pipe joint structure)
5 and 6B, a pipe joint structure 300 is obtained by joining a male pipe 50 and a female pipe 20 with an elastic locking member (hereinafter referred to as a “clip”) 30. 50, the male pipe 40 is provided with a main body-side outer peripheral shallow groove 51 and a pipe end-side outer peripheral shallow groove 52 in addition to the main body-side outer peripheral groove 11 and the pipe end-side outer peripheral groove 12.
The main body side outer peripheral shallow groove 51 is formed on the main body side outer peripheral groove side surface 11a of the main body side outer peripheral groove 11, and includes a main body side outer peripheral shallow groove bottom surface 51c between the main body side outer peripheral shallow groove side surface 51a. ing. At this time, the distance 51x between the main body side outer peripheral groove side surface 11a and the main body side outer peripheral shallow groove side surface 51a (hereinafter referred to as “main body side outer peripheral shallow groove width”) is larger than the main body side outer peripheral groove side width 11x.
Further, when the distance between the main body side outer peripheral shallow groove bottom surface 51c and the outer peripheral surface 10c is referred to as the main body side outer peripheral shallow groove depth 51t, the total of the main body side outer peripheral shallow groove depth 51t and the pipe end side inner peripheral groove depth 21t is the sum. Is smaller than the first clip thickness 31t.

同様に、管端寄り外周浅溝５２は、管端寄り外周溝１２の管端寄り外周溝側面１２ａに形成されたものであって、管端寄り外周浅溝側面５２ａとの間に管端寄り外周浅溝底面５２ｃを具備している。このとき、管端寄り外周溝側面１２ａと管端寄り外周浅溝側面５２ａとの距離（以下「管端寄り外周浅溝幅」と称す）５２ｘは、管端寄り外周溝幅１２ｘより小さく、管端寄り外周浅溝底面５２ｃと外周面１０ｃとの距離を管端寄り外周浅溝深さ５２ｔと称すると、管端寄り外周浅溝深さ５２ｔと本体寄り内周溝深さ２２ｔとの合計は、第２クリップ厚さ３２ｔよりも小さい。 Similarly, the outer peripheral shallow groove 52 near the pipe end is formed on the outer peripheral groove side surface 12a near the pipe end of the outer peripheral groove 12 near the pipe end, and is closer to the pipe end between the outer peripheral shallow groove side surface 52a near the pipe end. An outer peripheral shallow groove bottom surface 52c is provided. At this time, the distance 52x between the outer circumferential groove side surface 12a near the pipe end and the outer circumferential shallow groove side surface 52a near the pipe end (hereinafter referred to as "the outer circumferential shallow groove width" near the pipe end) 52x is smaller than the outer circumferential groove width 12x near the pipe end. If the distance between the bottom outer peripheral shallow groove bottom surface 52c and the outer peripheral surface 10c is referred to as the pipe end outer peripheral shallow groove depth 52t, the sum of the pipe end closer outer peripheral shallow groove depth 52t and the main body closer inner peripheral groove depth 22t is: The second clip thickness is smaller than 32t.

（接合）
図６の（ａ）において、管の継手構造３００は以上の構成であるから、管の継手構造１００（実施の形態１）と同じ要領で、雄管５０と雌管２０とをクリップ３０によって接合する。すなわち、管端寄り内周溝２１は管端寄り外周溝１２および管端寄り外周浅溝５２の位置を通過する。
図６の（ｂ）において、挿入が進むと、第１クリップ３１および第２クリップ３２はそれぞれ第１空間９１および第２空間９２内で、弾性復元して、第１クリップ外周面３１ｃは管端寄り内周溝２１の管端寄り内周溝底面２１ｄに当接し、第２クリップ外周面３２ｃは本体寄り内周溝２２の本体寄り内周溝底面２２ｄに当接する。 (Joining)
6A, since the pipe joint structure 300 has the above configuration, the male pipe 50 and the female pipe 20 are joined by the clip 30 in the same manner as the pipe joint structure 100 (Embodiment 1). To do. That is, the inner peripheral groove 21 near the pipe end passes through the positions of the outer peripheral groove 12 near the pipe end and the outer peripheral shallow groove 52 near the pipe end.
In FIG. 6B, when the insertion proceeds, the first clip 31 and the second clip 32 are elastically restored in the first space 91 and the second space 92, respectively, and the first clip outer peripheral surface 31c is the tube end. The inner peripheral groove bottom surface 21d near the pipe end of the inner peripheral groove 21 is in contact with the outer peripheral surface 32c of the second clip.

（押し込み力の作用）
図６の（ｃ）において、雄管５０を雌管２０に押し込む力が作用すると、第１クリップ端面３１ｂに管端寄り内周溝側面２１ｂが当接し、第１クリップ３１は本体寄り外周浅溝５１内（本体寄り外周浅溝底面５１ｃと管端寄り内周溝底面２１ｄとの間）に押し込まれ、第１クリップ端面３１ａは管端寄り外周浅溝側面５１ａに当接する。また、同時に第２クリップ端面３２ｂに本体寄り内周溝側面２２ｂが当接し、第２クリップ３２は管端寄り外周浅溝５２内（管端寄り外周浅溝底面５２ｃと本体寄り内周溝底面２２ｄとの間）に押し込まれ、第２クリップ端面３２ａは管端寄り外周浅溝側面５２ａに当接する。
このとき、第１クリップ外周面３１ｃは管端寄り内周溝底面２１ｄに当接し、第１クリップ内周面３１ｄは本体寄り外周浅溝底面５１ｃに近接しているから、所謂「ガタ」の無い状態になっている。同様に、第２クリップ外周面３２ｃは本体寄り内周溝底面２２ｄに当接し、第２クリップ内周面３２ｄは管端寄り外周浅溝底面５２ｃに近接しているから、所謂「ガタ」の無い状態になっている。したがって、雄管５０の管軸（図示しない）と雌管２０の管軸（図示しない）とは、両者に押し込む力が作用した際の同軸性が向上する（折れ曲がった状態になり難い）。 (Action of pushing force)
In FIG. 6C, when a force for pushing the male tube 50 into the female tube 20 is applied, the inner peripheral groove side surface 21b near the tube end comes into contact with the first clip end surface 31b, and the first clip 31 has an outer peripheral shallow groove near the main body. The first clip end surface 31a is in contact with the outer circumferential shallow groove side surface 51a closer to the pipe end by being pushed into 51 (between the main body closer outer circumferential shallow groove bottom surface 51c and the inner circumferential groove bottom surface 21d closer to the pipe end). At the same time, the inner peripheral groove side surface 22b near the main body abuts on the second clip end surface 32b, and the second clip 32 is located in the outer peripheral shallow groove 52 near the pipe end (the outer peripheral shallow groove bottom surface 52c near the pipe end and the inner peripheral groove bottom surface 22d near the main body. The second clip end surface 32a comes into contact with the outer peripheral shallow groove side surface 52a near the tube end.
At this time, the first clip outer peripheral surface 31c contacts the inner peripheral groove bottom surface 21d near the pipe end, and the first clip inner peripheral surface 31d is close to the main body outer peripheral shallow groove bottom surface 51c, so that there is no so-called “backlash”. It is in a state. Similarly, the second clip outer peripheral surface 32c abuts on the inner peripheral groove bottom surface 22d near the main body, and the second clip inner peripheral surface 32d is close to the outer peripheral shallow groove bottom surface 52c near the tube end, so that there is no so-called “backlash”. It is in a state. Therefore, the coaxiality of the tube axis (not shown) of the male tube 50 and the tube axis (not shown) of the female tube 20 is improved (they are unlikely to be bent) when a force for pushing them is applied.

［実施の形態４］
図７および図８は本発明の実施の形態４に係る管の継手構造を説明するものであって、図７の（ａ）は接合完了時の側面視の断面図、図７の（ｂ）は一部を拡大して示す接合完了時の側面視の拡大断面図、図８の（ａ）は一部を拡大して示す接合途中の側面視の拡大断面図、図８の（ｂ）は一部を拡大して示す引き離し力が作用したときの側面視の断面図、図８の（ｃ）は一部を拡大して示す押し込み力が作用したときの側面視の断面図である。なお、実施の形態２および実施の形態３と同じ部分または相当する部分には同じ符号を付し、一部の説明を省略する。また、各部は模式的に示すものであって、本発明は図示された形態（形状や相対的な大きさ等）に限定されるものではない。 [Embodiment 4]
7 and 8 illustrate a pipe joint structure according to Embodiment 4 of the present invention. FIG. 7 (a) is a cross-sectional view in side view when joining is completed, and FIG. 7 (b). FIG. 8A is an enlarged sectional view in side view at the time of completion of joining shown partially enlarged, FIG. 8A is an enlarged sectional view in side view in the middle of joining shown partially enlarged, and FIG. FIG. 8C is a cross-sectional view in a side view when a pulling force showing a part is enlarged, and FIG. 8C is a cross-sectional view in a side view when a pushing force showing a part is enlarged. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 2 and Embodiment 3, or an equivalent part, and one part description is abbreviate | omitted. Each part is shown typically and the present invention is not limited to the illustrated form (shape, relative size, etc.).

（管の継手構造）
図７において、管の継手構造４００は、雄管６０と雌管２０とが弾性係止部材（以下「クリップ」と称す）３０によって接合されたものであり、雄管６０は、本体寄り外周溝１１と管端寄り外周溝１２とに追加して、本体寄り外周浅溝４１、５１と管端寄り外周浅溝４２、５２とを具備するものである。 (Pipe joint structure)
In FIG. 7, a pipe joint structure 400 is obtained by joining a male pipe 60 and a female pipe 20 by an elastic locking member (hereinafter referred to as “clip”) 30. 11 and the outer peripheral groove 12 near the pipe end, the outer peripheral shallow grooves 41 and 51 near the main body and the outer peripheral shallow grooves 42 and 52 near the pipe end are provided.

（接合）
図８の（ａ）において、管の継手構造４００は以上の構成であるから、管の継手構造２００（実施の形態２）または管の継手構造（実施の形態３）と同じ要領で、雄管６０と雌管２０とをクリップ３０によって接合する。すなわち、管端寄り内周溝２１は、管端寄り外周溝１２、管端寄り外周浅溝４２および管端寄り外周浅溝５２の位置を通過する。
図７の（ｂ）において、挿入が進むと、第１クリップ３１および第２クリップ３２はそれぞれ第１空間９１および第２空間９２内で、弾性復元して、第１クリップ外周面３１ｃは管端寄り内周溝２１の管端寄り内周溝底面２１ｄに当接し、第２クリップ外周面３２ｃは本体寄り内周溝２２の本体寄り内周溝底面２２ｄに当接する。 (Joining)
In FIG. 8A, since the pipe joint structure 400 has the above configuration, the male pipe is the same as the pipe joint structure 200 (second embodiment) or the pipe joint structure (third embodiment). 60 and the female tube 20 are joined by the clip 30. That is, the inner peripheral groove 21 near the pipe end passes through the positions of the outer peripheral groove 12 near the pipe end, the outer peripheral shallow groove 42 near the pipe end, and the outer peripheral shallow groove 52 near the pipe end.
In FIG. 7B, when the insertion proceeds, the first clip 31 and the second clip 32 are elastically restored in the first space 91 and the second space 92, respectively, and the first clip outer peripheral surface 31c is the tube end. The inner peripheral groove bottom surface 21d near the pipe end of the inner peripheral groove 21 is in contact with the outer peripheral surface 32c of the second clip.

（引き離し力の作用）
図８の（ｂ）において、雄管６０と雌管２０とを引き離す力が作用すると、管の継手構造２００と同様に、第１クリップ３１は本体寄り外周浅溝４１内（本体寄り外周浅溝底面４１ｃと管端寄り内周溝底面２１ｄとの間）に引き込まれ、所謂「ガタ」の無い状態になる。同様に、第２クリップ３２は管端寄り外周浅溝４２内に引き込まれ、所謂「ガタ」の無い状態になっている。したがって、雄管４０の管軸（図示しない）と雌管２０の管軸（図示しない）とは、両者を引き離す力が作用した際の同軸性が向上する（折れ曲がった状態になり難い）。 (Effect of pulling force)
In FIG. 8B, when a force that separates the male tube 60 and the female tube 20 is applied, the first clip 31 is located in the outer circumferential shallow groove 41 near the main body (the outer peripheral shallow groove closer to the main body) as in the pipe joint structure 200. (Between the bottom surface 41c and the inner circumferential groove bottom surface 21d near the pipe end), so that there is no so-called “backlash”. Similarly, the second clip 32 is drawn into the outer circumferential shallow groove 42 near the pipe end, and is in a state without so-called “backlash”. Therefore, the tube axis (not shown) of the male tube 40 and the tube axis (not shown) of the female tube 20 are improved in coaxiality when a force to separate them is applied (it is difficult to be bent).

（押し込み力の作用）
図８の（ｃ）において、雄管５０を雌管２０に押し込む力が作用すると、管の継手構造３００と同様に、第１クリップ３１は本体寄り外周浅溝５１内に押し込まれ、所謂「ガタ」の無い状態になる。同様に、第２クリップ３２は管端寄り外周浅溝５２内に押し込まれ、所謂「ガタ」の無い状態になる。 (Action of pushing force)
In FIG. 8C, when a force for pushing the male pipe 50 into the female pipe 20 is applied, the first clip 31 is pushed into the outer peripheral shallow groove 51 near the main body, similar to the joint structure 300 of the pipe. "Is not in the state. Similarly, the second clip 32 is pushed into the outer circumferential shallow groove 52 near the pipe end, and is in a state without so-called “backlash”.

よって、管の継手構造４００では、雄管５０を雌管２０から引き離す力が作用しても、雄管５０を雌管２０に押し込む力が作用しても、両者の管軸の同軸性が向上する（折れ曲がり難くなっている）。 Therefore, in the pipe joint structure 400, even if the force that pulls the male pipe 50 away from the female pipe 20 acts or the force that pushes the male pipe 50 into the female pipe 20 acts, the coaxiality of both pipe axes is improved. Yes (becomes difficult to bend).

本発明によれば、複数の弾性係止部材（クリップ）をそれぞれ設置することができ、管軸方向の何れの方向の力に対しても接合が維持されるから、各種構造物や各種装置における管の接続構造として広く利用することができる。 According to the present invention, a plurality of elastic locking members (clips) can be installed, and the bonding is maintained for any force in the tube axis direction. It can be widely used as a pipe connection structure.

１０：雄管（実施の形態１）
１０ｂ：管端
１０ｃ：外周面
１０ｅ：面取り部
１１：本体寄り外周溝
１１ａ：本体寄り外周溝側面
１１ｂ：本体寄り外周溝側面
１１ｃ：本体寄り外周溝底面
１１ｘ：本体寄り外周溝幅
１２：管端寄り外周溝
１２ａ：管端寄り外周溝側面
１２ｂ：管端寄り外周溝側面
１２ｃ：管端寄り外周溝底面
１２ｘ：管端寄り外周溝幅
２０：雌管
２０ａ：管端
２０ｄ：内周面
２０ｅ：面取り部
２１：管端寄り内周溝
２１ａ：管端寄り内周溝側面
２１ｂ：管端寄り内周溝側面
２１ｄ：管端寄り内周溝底面
２１ｔ：管端寄り内周溝深さ
２１ｘ：管端寄り内周溝幅
２２：本体寄り内周溝
２２ａ：本体寄り内周溝側面
２２ｂ：本体寄り内周溝側面
２２ｄ：本体寄り内周溝底面
２２ｔ：本体寄り内周溝深さ
２２ｘ：本体寄り内周溝幅
３０：クリップ
３１：第１クリップ
３１ａ：第１クリップ端面
３１ｂ：第１クリップ端面
３１ｃ：第１クリップ外周面
３１ｄ：第１クリップ内周面
３１ｔ：第１クリップ厚さ
３１ｘ：第１クリップ幅
３２：第２クリップ
３２ａ：第２クリップ端面
３２ｂ：第２クリップ端面
３２ｃ：第２クリップ外周面
３２ｄ：第２クリップ内周面
３２ｔ：第２クリップ厚さ
３２ｘ：第２クリップ幅
４０：雄管（実施の形態２）
４１：本体寄り外周浅溝
４１ｂ：本体寄り外周浅溝側面
４１ｃ：本体寄り外周浅溝底面
４１ｔ：本体寄り外周浅溝深さ
４１ｘ：本体寄り外周浅溝幅
４２：管端寄り外周浅溝
４２ｂ：管端寄り外周浅溝側面
４２ｃ：管端寄り外周浅溝底面
４２ｔ：管端寄り外周浅溝深さ
４２ｘ：管端寄り外周浅溝幅
５０：雄管（実施の形態３）
５１：本体寄り外周浅溝
５１ａ：本体寄り外周浅溝側面
５１ｃ：本体寄り外周浅溝底面
５１ｔ：本体寄り外周浅溝深さ
５１ｘ：本体寄り外周浅溝幅
５２：管端寄り外周浅溝
５２ａ：管端寄り外周浅溝側面
５２ｃ：管端寄り外周浅溝底面
５２ｔ：管端寄り外周浅溝深さ
５２ｘ：管端寄り外周浅溝幅
６０：雄管（実施の形態４）
９１：第１空間
９２：第２空間
１００：継手構造（実施の形態１）
２００：継手構造（実施の形態２）
３００：継手構造（実施の形態３）
４００：継手構造（実施の形態４） 10: Male pipe (Embodiment 1)
10b: Pipe end 10c: Outer peripheral surface 10e: Chamfer 11: Main body side outer peripheral groove 11a: Main body side outer peripheral groove side surface 11b: Main body side outer peripheral groove side surface 11c: Main body side outer peripheral groove bottom surface 11x: Main body side outer peripheral groove width 12: Pipe end Near outer peripheral groove 12a: Outer peripheral groove side surface 12b near the pipe end: Outer peripheral groove side surface 12c near the pipe end: Outer peripheral groove bottom surface 12x near the pipe end: Outer peripheral groove width 20 near the pipe end: Female pipe 20a: End 20d: Inner peripheral surface 20e: Chamfer 21: Inner peripheral groove 21a near the pipe end: Inner peripheral groove side 21b near the pipe end: Inner peripheral groove side 21d near the pipe end: Inner peripheral groove bottom 21t near the pipe end: Inner peripheral groove depth 21x near the pipe end: Pipe Inner peripheral groove width 22 near the end: Inner peripheral groove 22a near the main body 22a: Inner peripheral groove side 22b near the main body 22d: Inner peripheral groove side 22d near the main body 22t: Inner peripheral groove bottom 22t near the main body: Inner peripheral groove depth 22x closer to the main body Inner circumferential groove width 30: clip 31: first chestnut 31a: first clip end surface 31b: first clip end surface 31c: first clip outer peripheral surface 31d: first clip inner peripheral surface 31t: first clip thickness 31x: first clip width 32: second clip 32a: first 2 clip end surface 32b: second clip end surface 32c: second clip outer peripheral surface 32d: second clip inner peripheral surface 32t: second clip thickness 32x: second clip width 40: male pipe (Embodiment 2)
41: Main body side outer peripheral shallow groove side 41c: Main body side outer peripheral shallow groove side surface 41c: Main body side outer peripheral shallow groove bottom surface 41t: Main body side outer peripheral shallow groove depth 41x: Main body side outer peripheral shallow groove width 42: Pipe end side outer peripheral shallow groove 42b: Pipe end near outer shallow groove side 42c: Pipe end near outer shallow groove bottom face 42t: Pipe end near outer shallow groove depth 42x: Pipe end closer outer shallow groove width 50: Male pipe (Embodiment 3)
51: Main body side outer peripheral shallow groove 51a: Main body side outer peripheral shallow groove side surface 51c: Main body side outer peripheral shallow groove bottom surface 51t: Main body side outer peripheral shallow groove depth 51x: Main body side outer peripheral shallow groove width 52: Pipe end side outer peripheral shallow groove 52a: Pipe end near outer shallow groove side 52c: Pipe end near outer shallow groove bottom face 52t: Pipe end near outer shallow groove depth 52x: Pipe end closer outer shallow groove width 60: Male pipe (Embodiment 4)
91: 1st space 92: 2nd space 100: Joint structure (Embodiment 1)
200: Joint structure (Embodiment 2)
300: Joint structure (Embodiment 3)
400: Joint structure (Embodiment 4)

Claims

管端部の外周面に本体寄り外周溝および管端寄り外周溝が形成された雄管と、前記雄管の外周面が侵入自在な管端部の内周面を具備し、該内周面に管端寄り内周溝および本体寄り内周溝が形成された雌管とが、拡縮自在な第１係止部材および拡縮自在な第２係止部材によって接合された管の継手構造であって、
前記第１係止部材は、前記本体寄り外周溝に侵入可能および管端寄り内周溝に係止可能であり、前記第２係止部材は、前記管端寄り外周溝に侵入可能および本体寄り内周溝に係止可能で、管端寄り内周溝に係止不可能であり、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の相違する位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の相違する位置にあり、少なくとも前記第２係止部材は、前記雌管の管端部の内周面に当接して縮径され、前記管端寄り外周溝に押し込められ、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の同じ位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の同じ位置にあり、前記第１係止部材は弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材は弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止し、
前記管端寄り外周溝の管端寄りに、前記管端寄り外周溝の深さより浅い深さの管端寄り外周浅溝が形成され、前記本体寄り外周溝の管端寄りに、前記本体寄り外周溝の深さより浅い深さの本体寄り外周浅溝が形成され、
前記第１係止部材が弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材が弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止した状態で、前記雄管を前記雌管から引き離す力が作用した際、前記第１係止部材は管軸方向に移動されて、前記本体寄り外周浅溝と前記管端寄り内周溝との間に引き込まれ、且つ、前記第２係止部材は管軸方向に移動されて、前記管端寄り外周浅溝と前記本体寄り内周溝との間に引き込まれることを特徴とする管の継手構造。 A male pipe having an outer peripheral groove closer to the main body and an outer peripheral groove closer to the pipe end on the outer peripheral surface of the pipe end portion, and an inner peripheral surface of the pipe end portion into which the outer peripheral surface of the male pipe can enter, the inner peripheral surface A pipe joint structure in which an inner circumferential groove near the pipe end and a female pipe formed with an inner circumferential groove near the main body are joined by a first locking member that can be expanded and contracted and a second locking member that can be expanded and contracted. ,
The first locking member can enter the outer peripheral groove near the main body and can lock into the inner peripheral groove near the pipe end, and the second locking member can enter the outer peripheral groove near the pipe end and close to the main body. It can be locked in the inner circumferential groove and cannot be locked in the inner circumferential groove near the pipe end.
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are located at different positions in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are It is in a position different in the axial direction, and at least the second locking member is reduced in diameter in contact with the inner peripheral surface of the tube end of the female tube, and is pushed into the outer peripheral groove near the tube end,
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are at the same position in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastic. Restore and lock across the outer circumferential groove near the pipe end and the inner circumferential groove near the main body ,
Near the pipe end of the outer peripheral groove near the pipe end, an outer peripheral shallow groove near the pipe end having a depth shallower than the depth of the outer peripheral groove near the pipe end is formed. A shallow groove near the body with a depth shallower than the depth of the groove is formed,
The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastically restored and close to the pipe end. When the force that pulls the male tube away from the female tube is applied in a state of being locked across the outer peripheral groove and the inner peripheral groove closer to the main body, the first locking member is moved in the tube axis direction, The outer peripheral shallow groove near the main body and the inner peripheral groove near the pipe end are pulled in, and the second locking member is moved in the tube axis direction so that the outer peripheral shallow groove near the pipe end and the inner peripheral groove A pipe joint structure characterized by being drawn into a circumferential groove .

管端部の外周面に本体寄り外周溝および管端寄り外周溝が形成された雄管と、前記雄管の外周面が侵入自在な管端部の内周面を具備し、該内周面に管端寄り内周溝および本体寄り内周溝が形成された雌管とが、拡縮自在な第１係止部材および拡縮自在な第２係止部材によって接合された管の継手構造であって、
前記第１係止部材は、前記本体寄り外周溝に侵入可能および管端寄り内周溝に係止可能であり、前記第２係止部材は、前記管端寄り外周溝に侵入可能および本体寄り内周溝に係止可能で、管端寄り内周溝に係止不可能であり、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の相違する位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の相違する位置にあり、少なくとも前記第２係止部材は、前記雌管の管端部の内周面に当接して縮径され、前記管端寄り外周溝に押し込められ、
前記本体寄り外周溝に前記第１係止部材が係止し、且つ、前記管端寄り外周溝に前記第２係止部材が係止した状態で、前記雄管の管端部が前記雌管の管端部に侵入され、前記本体寄り外周溝と前記管端寄り内周溝とが管軸方向の同じ位置にあるとき、前記管端寄り外周溝と前記本体寄り内周溝とが管軸方向の同じ位置にあり、前記第１係止部材は弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材は弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止し、
前記管端寄り外周溝の本体寄りに、前記管端寄り外周溝の深さより浅い深さの管端寄り外周浅溝が形成され、前記本体寄り外周溝の本体寄りに、前記本体寄り外周溝の深さより浅い深さの本体寄り外周浅溝が形成され、
前記第１係止部材が弾性復元して前記本体寄り外周溝および前記管端寄り内周溝に跨がって係止し、且つ、前記第２係止部材が弾性復元して前記管端寄り外周溝および前記本体寄り内周溝に跨がって係止した状態で、前記雄管を前記雌管に押し込む力が作用した際、前記第１係止部材は管軸方向に移動されて、前記本体寄り外周浅溝と前記管端寄り内周溝との間に押し込められ、且つ、前記第２係止部材は管軸方向に移動されて、前記管端寄り外周浅溝と前記本体寄り内周溝との間に押し込められることを特徴とする管の継手構造。 A male pipe having an outer peripheral groove closer to the main body and an outer peripheral groove closer to the pipe end on the outer peripheral surface of the pipe end portion, and an inner peripheral surface of the pipe end portion into which the outer peripheral surface of the male pipe can enter, the inner peripheral surface A pipe joint structure in which an inner circumferential groove near the pipe end and a female pipe formed with an inner circumferential groove near the main body are joined by a first locking member that can be expanded and contracted and a second locking member that can be expanded and contracted. ,
The first locking member can enter the outer peripheral groove near the main body and can lock into the inner peripheral groove near the pipe end, and the second locking member can enter the outer peripheral groove near the pipe end and close to the main body. It can be locked in the inner circumferential groove and cannot be locked in the inner circumferential groove near the pipe end.
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are located at different positions in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are It is in a position different in the axial direction, and at least the second locking member is reduced in diameter in contact with the inner peripheral surface of the tube end of the female tube, and is pushed into the outer peripheral groove near the tube end,
In a state where the first locking member is locked in the outer peripheral groove near the main body and the second locking member is locked in the outer peripheral groove near the tube end, the tube end portion of the male tube is the female tube. When the outer peripheral groove closer to the main body and the inner peripheral groove closer to the pipe end are at the same position in the tube axis direction, the outer peripheral groove closer to the pipe end and the inner peripheral groove closer to the main body are The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastic. Restore and lock across the outer circumferential groove near the pipe end and the inner circumferential groove near the main body,
Near the main body of the outer peripheral groove near the pipe end, a shallow outer peripheral groove near the pipe end, which is shallower than the depth of the outer peripheral groove near the pipe end, is formed near the main body of the outer peripheral groove near the main body. A shallow groove near the main body with a depth shallower than the depth is formed,
The first locking member is elastically restored and locked across the outer peripheral groove near the main body and the inner peripheral groove near the pipe end, and the second locking member is elastically restored and close to the pipe end. When the force for pushing the male tube into the female tube is applied in a state of being locked across the outer peripheral groove and the inner peripheral groove closer to the main body, the first locking member is moved in the tube axis direction, The outer peripheral shallow groove near the main body and the inner peripheral groove near the pipe end are pushed in, and the second locking member is moved in the tube axis direction so that the outer peripheral shallow groove near the pipe end and the inner peripheral groove A pipe joint structure characterized by being pushed into a circumferential groove .

前記雌管は、管端部が拡径され、管端部の肉厚が本体部の肉厚とは略同じであることを特徴とする請求項１または２に記載の管の継手構造。 The pipe joint structure according to claim 1 or 2, wherein the female pipe has a pipe end portion whose diameter is increased, and a wall thickness of the pipe end portion is substantially the same as a wall thickness of the main body portion.