JP4887168B2

JP4887168B2 - Pipe fitting

Info

Publication number: JP4887168B2
Application number: JP2007026645A
Authority: JP
Inventors: 崇明猪谷; 明夫永見; 孝正野村; 義郎岡崎
Original assignee: Hitachi Metals Ltd; JFE Pipe Fitting Mfg Co Ltd
Current assignee: Hitachi Metals Ltd; JFE Pipe Fitting Mfg Co Ltd
Priority date: 2007-02-06
Filing date: 2007-02-06
Publication date: 2012-02-29
Anticipated expiration: 2027-02-06
Also published as: JP2008190648A

Description

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

この種のワンタッチ方式の管継手として、例えば、図１２に示すように、基体（継手本体）３０の大径部の内面に設けられた２条の周溝にＯリング３１を嵌め込み、大径部の縁端にコイルバネ３２と、内側面に直角エッジ３３aを有する押圧部材３３が嵌め込まれた合成樹脂製の内カラー３４とが配置され、これらをテーパ付外カラー（押輪）３５で覆うようにしたものがある（特許文献１参照。）。この管継手によれば、内カラー３４の先端より接続管３６が挿入されると、押圧部材３３が内カラー３４の先端側に押されるが、押圧部材３３の外側面が外カラー３５のテーパ面３５aで押圧されて内側面の直角エッジ３３aが接続管３６に食い込むことにより、これら管継手と接続管３６との結合が保持される。この結合状態で接続管３６に引き抜き力が作用すると、押圧部材３３はコイルバネ３２の弾発力により外カラー３５のテーパ面３５ａ側に押し付けられると共に、そのテーパ面３５aによって押圧部材３３の直角エッジ３３ａが接続管３６を押圧することにより、接続管３６の引き抜きが阻止されるというものである。 As this kind of one-touch type pipe joint, for example, as shown in FIG. 12, an O-ring 31 is fitted into two circumferential grooves provided on the inner surface of the large-diameter portion of the base body (joint body) 30 to A coil spring 32 and an inner collar 34 made of a synthetic resin into which a pressing member 33 having a right-angled edge 33a is fitted are arranged at the edge of the inner surface, and these are covered with a tapered outer collar (push wheel) 35. There is a thing (refer patent document 1). According to this pipe joint, when the connection pipe 36 is inserted from the front end of the inner collar 34, the pressing member 33 is pressed toward the front end side of the inner collar 34, but the outer surface of the pressing member 33 is the tapered surface of the outer collar 35. The connection between the pipe joint and the connection pipe 36 is maintained by the right-angled edge 33a on the inner surface biting into the connection pipe 36 by being pressed by 35a. When a pulling force is applied to the connecting pipe 36 in this coupled state, the pressing member 33 is pressed against the tapered surface 35a side of the outer collar 35 by the elastic force of the coil spring 32, and the right-angled edge 33a of the pressing member 33 by the tapered surface 35a. When the connection pipe 36 is pressed, the connection pipe 36 is prevented from being pulled out.

特開平１０−１２２４６０号公報（図１〜図７）JP-A-10-122460 (FIGS. 1 to 7)

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

本発明は、このような問題点を解消するためになされたものであり、その目的とするところは、接続管を挿入するだけのいわゆるワンタッチ操作でシール状にかつ抜止め状に接続できるうえ、接続管への差し込み代のマーキング作業を省け、接続管挿入後の状態を人目で容易に確認でき、施工性、信頼性に優れる管継手を提供することにある。本発明の他の目的は、継手本体への組込み部材点数及び工数の減少を図れる管継手を提供することにある。 The present invention has been made to solve such problems, and the object of the present invention is that it can be connected in a seal-like and retaining shape by a so-called one-touch operation by simply inserting a connecting pipe, It is an object of the present invention to provide a pipe joint that eliminates the marking work of the insertion allowance to the connecting pipe, can easily confirm the state after the connecting pipe is inserted, and has excellent workability and reliability. Another object of the present invention is to provide a pipe joint that can reduce the number of members to be assembled into the joint body and the number of man-hours.

上記目的を達成するために、本発明の管継手は、請求項１に記載のように、少なくとも一端部に接続管の端部を受け入れる受口部を有し、かつ該受口部寄りの円周上の少なくとも一箇所に確認孔を内外貫通状に設けた継手本体内に、前記受口部から継手本体内奥に向かって順に、前記接続管の外周面に係合される抜止部材と、前記抜止部材側に後端部を当接係合して該抜止部材を受口部の内周に向かって押圧付勢する弾性部材と、前記確認孔の内側位置に配置され、前記弾性部材の先端部に係合する環状の表示兼可動スペーサーと、前記表示兼可動スペーサーを前記確認孔の内側位置に位置決め保持するスペーサー位置決め部材と、前記接続管の外周面に密着するシールリングを収容しており、前記受口部の内周に、前記抜止部材の当接により該抜止部材に径方向内方への移動作用を加えるテーパ面を受口部外方に向かって窄まり状に形成しており、前記スペーサー位置決め部材は、前記接続管の挿入に伴い該接続管の端部で継手本体内奥へ押し込まれるようになし、このスペーサー位置決め部材の押し込みに伴い前記表示兼可動スペーサーが前記確認孔の内側位置から継手本体内奥側へ移動して退くように構成してあることに特徴を有するものである。 In order to achieve the above object, the pipe joint of the present invention has a receiving part for receiving the end of the connecting pipe at least at one end as described in claim 1, and a circle near the receiving part. In a joint main body provided with a confirmation hole in at least one place on the periphery in an inner and outer through shape, a retaining member that is engaged with the outer peripheral surface of the connection pipe in order from the receiving portion toward the inner depth of the joint main body, An elastic member that abuts and engages the rear end portion with the retaining member side and presses and urges the retaining member toward the inner periphery of the receiving portion, and is disposed at an inner position of the confirmation hole. An annular display / movable spacer that engages with the tip, a spacer positioning member that positions and holds the display / movable spacer at the inner position of the confirmation hole, and a seal ring that closely contacts the outer peripheral surface of the connection pipe are accommodated. And by the contact of the retaining member with the inner periphery of the receiving portion. A taper surface that applies a radially inward moving action to the retaining member is formed in a constricted shape toward the outside of the receiving portion, and the spacer positioning member is connected to the connecting tube as the connecting tube is inserted. The display / movable spacer moves from the inner position of the confirmation hole to the inner side of the joint body and retreats as the spacer positioning member is pushed. It has the characteristics in being.

このような構成によれば、接続管を継手本体に挿入する前においては確認孔から表示兼可動スペーサーを見ることができる。そして、接続管を継手本体に挿入するに伴いスペーサー位置決め部材が接続管の端部でシールリングよりも継手本体内奥側の位置に押し込まれ、この押し込みに伴い表示兼可動スペーサーが弾性部材の反力で確認孔の内側位置より継手本体内奥側へ移動して退く。この表示兼可動スペーサーの確認孔からの退きにより確認孔から該表示兼可動スペーサーが見えなくなるのを確認でき、これにより接続管が挿入されたことを確認できるため、接続管の挿入不足を未然に防止でき、接続管への差し込み代のマーキング作業を省略することができる。 According to such a configuration, the display / movable spacer can be seen from the confirmation hole before the connection pipe is inserted into the joint body. Then, as the connecting pipe is inserted into the joint body, the spacer positioning member is pushed into the inner side of the joint body with respect to the seal ring at the end of the connecting pipe. Move to the inner side of the joint body from the inner position of the confirmation hole by force and retract. The retraction of the display / movable spacer from the confirmation hole makes it possible to confirm that the display / movable spacer is not visible from the confirmation hole, thereby confirming that the connection pipe has been inserted. This can be prevented, and the marking work for inserting into the connecting pipe can be omitted.

確認孔はシールリングよりも受口部側の位置に設けているので、接続管が挿入完了位置まで挿入されると、シールリングは接続管の外周面に圧縮状に密着して接続管の外周面と継手本体の内周面との間を確実に密封シールするとともに、接続管内を流れる水等流体が接続管の端部から接続管の外周と継手本体の内周との間を経て確認孔に漏れ出ることのないように密封シールする。つまり、一つのシールリングが接続管の端部の外周面と継手本体の内周面との間および確認孔の双方を密封シールして内部流体の漏洩を防止する。 Since the confirmation hole is provided at a position closer to the receiving part than the seal ring, when the connection pipe is inserted to the insertion completion position, the seal ring is compressed in close contact with the outer peripheral surface of the connection pipe. A seal hole is securely sealed between the surface and the inner peripheral surface of the joint body, and water or other fluid flowing in the connection pipe passes from the end of the connection pipe between the outer periphery of the connection pipe and the inner periphery of the joint body. Seal hermetically to prevent leakage. That is, one seal ring seals both the outer peripheral surface of the end portion of the connecting pipe and the inner peripheral surface of the joint body and the confirmation hole, thereby preventing leakage of internal fluid.

接続管が完全に挿入されると、抜止部材は弾性部材により受口部のテーパ面に押し付けられると共に、そのテーパ面によって抜止部材が縮径して接続管の外周面に係合されることにより、接続管の抜止め状態が得られる。 When the connecting pipe is completely inserted, the retaining member is pressed against the tapered surface of the receiving portion by the elastic member, and the retaining member is reduced in diameter by the tapered surface and engaged with the outer peripheral surface of the connecting tube. The connection pipe can be kept from being pulled out.

接続管の挿入後、接続管に引き抜き力が加えられると、接続管と同行する抜止部材が受口部のテーパ面と当接することにより、抜止部材が径方向内方へ移動して、接続管の外周面への係合力が増す。これにより接続管の抜け出しが確実に阻止される。 When a pulling force is applied to the connecting pipe after the connecting pipe is inserted, the retaining member that accompanies the connecting pipe comes into contact with the tapered surface of the receiving portion, so that the retaining member moves inward in the radial direction. Engagement force on the outer peripheral surface increases. This reliably prevents the connecting pipe from coming out.

請求項１記載の管継手は、請求項２に記載のように、前記スペーサー位置決め部材は、前記接続管の端部に外嵌可能なスリーブ形状に形成することができる。この場合において、スペーサー位置決め部材は、請求項３に記載のように、内径が前記接続管の内径と略同一径に形成されたシールリング保持筒部と、このシールリング保持筒部の後端側に一体に連設され、内径が前記接続管の外径よりも大きく形成されて前記接続管の端部に外嵌可能な接続管端部受け筒部とを有する形に形成することができる。これによれば、接続管を切断する際、その切断端面に多少のバリが発生してもそれを除去する加工を怠っても、接続管の挿入時に該接続管の端部のバリ等でシールリングを傷付けることなく施工できる。したがって、接続管の切断方法に制限がなくその切断施工の自由度が得られる。 In the pipe joint according to a first aspect, as described in the second aspect, the spacer positioning member can be formed in a sleeve shape that can be fitted onto an end of the connection pipe. In this case, as described in claim 3, the spacer positioning member includes a seal ring holding cylinder portion having an inner diameter substantially the same as the inner diameter of the connection pipe, and a rear end side of the seal ring holding cylinder portion. And a connecting tube end receiving tube portion that is formed to have an inner diameter larger than the outer diameter of the connecting tube and can be fitted over the end of the connecting tube. According to this, when cutting the connecting pipe, even if some burr is generated on the cut end face, even if neglected to remove it, the connecting pipe is sealed with a burr or the like at the end of the connecting pipe. Can be constructed without damaging the ring. Therefore, there is no restriction on the method of cutting the connecting pipe, and the degree of freedom of the cutting work can be obtained.

請求項３記載の管継手は、請求項４に記載のように、前記シールリング保持筒部の外周に、自由状態の前記シールリングの内径部が嵌まり込む凹溝を形成することができる。これによれば、接続管を挿入する前、すなわち在庫、保管時にシールリングには内部応力が発生せず、シールリングは接続管が挿入されたときにはじめて弾性的に拡径して接続管の外周に密着するので、適切な圧縮代が長期間にわたり維持され、所定の耐用年数を保証することができる。また、接続管を挿入する前において、そのようにスペーサー位置決め部材は凹溝をシールリングの内径部に嵌合することにより当該位置に仮止め状態に保持されるので、表示兼可動スペーサーを確認孔の内側位置に位置決め保持する機能を発揮することができる。 In the pipe joint according to claim 3, as described in claim 4, a concave groove into which the inner diameter portion of the seal ring in a free state is fitted can be formed on the outer periphery of the seal ring holding cylinder portion. According to this, the internal stress is not generated in the seal ring before inserting the connection pipe, that is, in stock and storage, and the seal ring is elastically expanded only when the connection pipe is inserted and Since it adheres closely to the outer periphery, an appropriate compression allowance is maintained over a long period of time, and a predetermined service life can be guaranteed. In addition, before inserting the connecting pipe, the spacer positioning member is held in a temporarily fixed state at that position by fitting the concave groove to the inner diameter portion of the seal ring, so the display / movable spacer is The function of locating and maintaining the inner position can be exhibited.

請求項１ないし３のいずれか１項に記載の管継手は、請求項４に記載のように、前記表示兼可動スペーサーの後端側にはその弾性により径方向外方へ張り出す戻り防止弾性爪を設け、前記継手本体の前記確認孔よりも継手本体内奥側の内周に、前記表示兼可動スペーサーが前記確認孔の内側位置から退くに伴い前記戻り防止弾性爪が係合する凹部を設けることができる。これによれば、接続管の挿入後に、内圧でシールリングが受口部の方向へ移動することにより表示兼可動スペーサーが確認孔の内側位置に押し戻されるのを防止できる。したがって、接続管の挿入後に、表示兼可動スペーサーが押し戻されて確認孔から見えることによる接続管の挿入未完了の誤認を防止できる。 The pipe joint according to any one of claims 1 to 3, as described in claim 4, has a return preventing elasticity that projects outward in the radial direction due to its elasticity at the rear end side of the display / movable spacer. A claw is provided, and a recess is formed on the inner periphery of the joint body behind the confirmation hole of the joint body to which the return preventing elastic claw engages when the display / movable spacer retreats from the inner position of the confirmation hole. Can be provided. According to this, it is possible to prevent the display / movable spacer from being pushed back to the inner position of the confirmation hole by moving the seal ring toward the receiving portion with internal pressure after the connection pipe is inserted. Therefore, after insertion of the connecting pipe, it is possible to prevent erroneous recognition of the incomplete insertion of the connecting pipe due to the display / movable spacer being pushed back and visible from the confirmation hole.

本発明の管継手によれば、接続管を挿入するだけのいわゆるワンタッチ操作でシール状にかつ抜止め状に接続でき、しかも接続管への差し込み代のマーキング作業を省け、接続管挿入後の状態を人目で容易に確認でき、施工性、信頼性に優れる。また、単一のシールリングが接続管の端部の外周面と継手本体の内周面との間の密封シールと確認孔の密封シールとを兼備し、それだけ継手本体への組込み部材点数及び工数の減少を図り得るという利点がある。 According to the pipe joint of the present invention, it can be connected in a seal-like and retaining shape by a so-called one-touch operation by simply inserting the connecting pipe, and the marking operation for inserting the connecting pipe into the connecting pipe is omitted, and the state after the connecting pipe is inserted. Can be easily confirmed by the human eye and is excellent in workability and reliability. In addition, a single seal ring combines the sealing seal between the outer peripheral surface of the end of the connecting pipe and the inner peripheral surface of the joint body and the sealing seal of the confirmation hole. There is an advantage that it can be reduced.

図１は本発明の一実施例を示す管継手の斜視図、図２は接続管の挿入完了後の状態を示す同管継手の半欠截断面図、図３は接続管を挿入する前の状態を示す同管継手の半欠截断面図、図４は接続管の挿入途中の状態を示す同管継手の欠截断面図、図５は接続管を更なる挿入途中の状態を示す同管継手の半欠截断面図、図６は同管継手の表示兼可動スペーサーの斜視図、図７（ａ）は同管継手のスペーサー位置決め部材の斜視図、図７（ｂ）は同スペーサー位置決め部材の一部拡大断面図、図８は同管継手のカラーの平面図、図９は同カラーの正面図、図１０は同カラーの断面図である。 FIG. 1 is a perspective view of a pipe joint showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the pipe joint after the insertion of the connection pipe is completed, and FIG. 3 is a view before the connection pipe is inserted. FIG. 4 is a partially cutaway sectional view of the pipe joint showing a state in the middle of insertion of the connection pipe, and FIG. 5 is a same pipe showing a state in the middle of further insertion of the connection pipe. FIG. 6 is a perspective view of the display and movable spacer of the pipe joint, FIG. 7A is a perspective view of the spacer positioning member of the pipe joint, and FIG. 7B is the spacer positioning member. FIG. 8 is a plan view of the collar of the pipe joint, FIG. 9 is a front view of the collar, and FIG. 10 is a sectional view of the collar.

図１〜図３に示すように、管継手１は、両端部が開口した筒形状を有する継手本体２と、この継手本体２の内部に収容配置される抜止部材３と、弾性部材４と、表示兼可動スペーサー６と、スペーサー位置決め部材７と、シールリング５等を備えている。 As shown in FIGS. 1 to 3, the pipe joint 1 includes a joint body 2 having a cylindrical shape with both ends opened, a retaining member 3 accommodated and disposed inside the joint body 2, an elastic member 4, A display / movable spacer 6, a spacer positioning member 7, a seal ring 5 and the like are provided.

継手本体２は、軸方向中央付近に第１，２の段部８ａ，８ｂを設け、この第１，２の段部８ａ，８ｂをはさんで一側に大径部９を、他側に小径の流路１０を形成し、大径部９の開口端部、すなわち継手本体２の軸方向一端部に接続管１１の端部が挿入される受口部１２を形成し、他端部の外周に接続用雄ねじＳを形成している。第１の段部８ａと第２の段部８ｂとは、第１の段部８ａが第２の段部８ｂよりも継手本体内奥に位置するように並べて形成され、かつ第１の段部８ａよりも第２の段部８ａを径大に形成している。受口部１２の内周には受口部外方に向かって窄まり状のテーパ面１３と、テーパ面１３の受口部外方側端に円周溝１４を形成している。継手本体２の第２の段部８ｂよりも受口部１２寄り側の円周上の少なくとも一箇所には確認孔１８を内外貫通状に設けている。 The joint body 2 is provided with first and second step portions 8a and 8b in the vicinity of the center in the axial direction, the large diameter portion 9 on one side and the other side on the other side of the first and second step portions 8a and 8b. A small-diameter channel 10 is formed, and an opening end portion of the large-diameter portion 9, that is, a receiving portion 12 into which an end portion of the connection pipe 11 is inserted at one end portion in the axial direction of the joint body 2 is formed. A connecting male screw S is formed on the outer periphery. The first step portion 8a and the second step portion 8b are formed side by side so that the first step portion 8a is located deeper in the joint body than the second step portion 8b, and the first step portion The second step portion 8a is formed larger in diameter than 8a. On the inner periphery of the receiving portion 12, a tapered surface 13 that is narrowed toward the outside of the receiving portion, and a circumferential groove 14 is formed on the outer end of the receiving portion of the tapered surface 13. A confirmation hole 18 is provided in an inner and outer penetrating manner in at least one place on the circumference closer to the receiving portion 12 than the second step portion 8b of the joint body 2.

受口部１２の内部には、テーパ面１３に内接する抜止部材３と、この抜止部材３を保持するカラー１５と、抜止部材３をカラー１５ごとテーパ面１３に向かって押圧付勢する弾性部材４とが配置されている。継手本体２の円周溝１４には止め輪１６が嵌合されてその内径部でカラー１５が受口部外方へ抜け出るのを防止している。 Inside the receiving portion 12, a retaining member 3 inscribed in the tapered surface 13, a collar 15 that holds the retaining member 3, and an elastic member that presses and urges the retaining member 3 together with the collar 15 toward the tapered surface 13. 4 are arranged. A retaining ring 16 is fitted into the circumferential groove 14 of the joint body 2 to prevent the collar 15 from coming out of the receiving portion at the inner diameter portion thereof.

弾性部材４は圧縮コイルばね等からなり、この弾性部材４の先端部は断面Ｌ形の環状の表示兼可動スペーサー６の段部６ａに係合し、同弾性部材４の後端部はカラー１５の後端の段部１５ａに当接係合している。 The elastic member 4 is formed of a compression coil spring or the like, and the front end portion of the elastic member 4 is engaged with the step portion 6a of the annular display / movable spacer 6 having an L-shaped cross section. The rear end stepped portion 15a is abuttingly engaged.

表示兼可動スペーサー６は、接続管１１の挿入前において、図３に示すようにスペーサー位置決め部材７により確認孔１８の内側に位置するように位置決め保持される。表示兼可動スペーサー６は、図３、図６に示すようにこれの後端側に弾性により径方向外方へ張り出す戻り防止弾性爪６ｂを設ける一方、図３のように継手本体２の確認孔１８よりも継手本体内奥側の内周に凹部１７を設けて、図５に示すように表示兼可動スペーサー６が確認孔１８の内側位置から継手本体内奥へ移動して退くと戻り防止弾性爪６ｂが弾性により径方向外方へ突出して凹部１７に係合し、この係合により表示兼可動スペーサー６が確認孔１８の内側位置に戻ることのないようにしている。表示兼可動スペーサー６は、確認孔１８からより一層確認し易くするために、例えば赤色や青色等の目立つ色に着色を施しておくことが好ましい。 The display / movable spacer 6 is positioned and held by the spacer positioning member 7 so as to be positioned inside the confirmation hole 18 as shown in FIG. As shown in FIGS. 3 and 6, the display / movable spacer 6 is provided with a return-preventing elastic claw 6b protruding outward in the radial direction by elasticity on the rear end side thereof, while the joint body 2 is confirmed as shown in FIG. A recess 17 is provided in the inner periphery of the joint body behind the hole 18 to prevent the display / movable spacer 6 from returning from the inner position of the confirmation hole 18 to the interior of the joint body as shown in FIG. The elastic claw 6 b protrudes radially outward by elasticity and engages with the recess 17, and this engagement prevents the display / movable spacer 6 from returning to the inner position of the confirmation hole 18. The display / movable spacer 6 is preferably colored in a conspicuous color, such as red or blue, for easier confirmation from the confirmation hole 18.

スペーサー位置決め部材７には、接続管１１の挿入前において、表示兼可動スペーサー６を確認孔１８の内側に位置するように位置決め保持する本来の機能のほかに、接続管１１の切断端部にバリが発生していても該端部でシールリング５を傷付けるのを防止する傷付き防止機能をも兼備させる。そのために、スペーサー位置決め部材７は、接続管１１の端部に外嵌可能なスリーブ形状に形成する。更に具体的には、スペーサー位置決め部材７は、図３、図７（ａ）、（ｂ）に示すように、その内径が接続管１１の内径と略同一径に形成されたシールリング保持筒部７ａと、このシールリング保持筒部７ａの後端側に連続状に一体形成され、その内径が接続管１１の外径よりも大きく形成されて接続管１１の端部に外嵌可能な接続管端部受け筒部７ｂとを有するスリーブ形状に形成されている。シールリング保持筒部７ａの内周面と接続管端部受け筒部７ｂの内周面との間には、接続管１１の端部の端面が当接係合可能な段部２３を形成している。シールリング保持筒部７ａの外周には、自由状態のシールリング５の内径部が嵌まり込む凹溝２４を形成している。 In addition to the original function of positioning and holding the display / movable spacer 6 so as to be positioned inside the confirmation hole 18 before the connection pipe 11 is inserted, the spacer positioning member 7 has a variability at the cut end of the connection pipe 11. Even if this occurs, it also has a damage prevention function for preventing the seal ring 5 from being damaged at the end. Therefore, the spacer positioning member 7 is formed in a sleeve shape that can be fitted around the end of the connection pipe 11. More specifically, as shown in FIGS. 3, 7A and 7B, the spacer positioning member 7 has a seal ring holding cylinder portion whose inner diameter is substantially the same as the inner diameter of the connection pipe 11. 7a and a connecting pipe that is integrally formed continuously on the rear end side of the seal ring holding cylinder portion 7a and whose inner diameter is larger than the outer diameter of the connecting pipe 11 and can be fitted over the end of the connecting pipe 11. It is formed in a sleeve shape having an end receiving cylinder portion 7b. Between the inner peripheral surface of the seal ring holding cylinder portion 7a and the inner peripheral surface of the connection pipe end receiving cylinder portion 7b, a step portion 23 is formed in which the end surface of the end portion of the connection pipe 11 can abut and engage. ing. On the outer periphery of the seal ring holding cylinder portion 7a, a concave groove 24 into which the inner diameter portion of the seal ring 5 in a free state is fitted is formed.

カラー１５は、図３、図８〜１０に示すように、複数個の保持穴１５ｂを円周方向に所定間隔置きに有し、各保持穴１５ｂに抜止部材３が嵌着されている。抜止部材３が保持穴１５ｂからカラー１５の内側へ離脱するのを防止するために図示例では抜止部材３にリブ３ｂを設けているが、これに代えてカラー１５側にそのような離脱防止用突起等（図示せず）を設けてもよい。各抜止部材３の内面側には複数（図例では２個）の係合歯３ａを形成している。 As shown in FIGS. 3 and 8 to 10, the collar 15 has a plurality of holding holes 15 b at predetermined intervals in the circumferential direction, and the retaining member 3 is fitted into each holding hole 15 b. In order to prevent the retaining member 3 from detaching from the holding hole 15b to the inside of the collar 15, in the illustrated example, the retaining member 3 is provided with ribs 3b. A protrusion or the like (not shown) may be provided. A plurality (two in the illustrated example) of engaging teeth 3 a are formed on the inner surface side of each retaining member 3.

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

上記の管継手１による接続管１１の施工手順を図２〜図５を参照にして説明する。 The construction procedure of the connecting pipe 11 by the pipe joint 1 will be described with reference to FIGS.

予め、図３に示すように、継手本体２内には、受口部１２から継手本体２内奥に向かって順に、抜止部材３と、弾性部材４と、表示兼可動スペーサー６と、スペーサー位置決め部材７、およびシールリング５等全ての部品を組み込んでおく。その際、シールリング５は継手本体２内の第２の段部８ｂに配置し、かつ自由状態でこれの内径部がスペーサー位置決め部材７の凹溝２４に嵌まり込むように配置される。表示兼可動スペーサー６は弾性部材４の先端部とスペーサー位置決め部材７の接続管端部受け筒部７ｂとの間であって確認孔１８の内側に位置するように配置されて該確認孔１８から見えるように配置する。スペーサー位置決め部材７は凹溝２４をシールリング５の内径部に嵌合することにより当該位置に仮止め状態に保持されるので、表示兼可動スペーサー６を前記所定位置に位置決め保持する機能を発揮する。こうした組み込み状態で管継手１は在庫、保管される。 As shown in FIG. 3, in the joint main body 2, the retaining member 3, the elastic member 4, the display / movable spacer 6, and the spacer positioning are sequentially arranged from the receiving port 12 toward the inner part of the joint main body 2. All parts such as the member 7 and the seal ring 5 are incorporated. At that time, the seal ring 5 is disposed on the second step portion 8 b in the joint body 2, and the inner diameter portion of the seal ring 5 is disposed so as to fit into the concave groove 24 of the spacer positioning member 7 in a free state. The display / movable spacer 6 is disposed between the distal end portion of the elastic member 4 and the connecting tube end receiving cylindrical portion 7b of the spacer positioning member 7 so as to be positioned inside the confirmation hole 18 and from the confirmation hole 18. Arrange it so that it can be seen. Since the spacer positioning member 7 is held in a temporarily fixed state at the corresponding position by fitting the concave groove 24 to the inner diameter portion of the seal ring 5, the function of positioning and holding the display / movable spacer 6 at the predetermined position is exhibited. . In such an assembled state, the pipe joint 1 is stocked and stored.

しかる後、現場施工で、図４に示すように、継手本体２の受口部１２に接続管１１を挿入し、その端部がスペーサー位置決め部材７の接続管端部受け筒部７ｂ内に進入して段部２３に当接するまで挿入すると、弾性体４の弾発力により抜止部材３がテーパ面１３に押圧されてカラー１５の保持穴１５ｂ内で径方向内方に移動して係合歯３ａを接続管１１の外周面に強く係合する。したがって、このとき接続管１１を引き抜く方向に外力が加わったとしても接続管１１が抜け出るようなことはない。
また、シールリング５と接続管１１の端部との間にはスペーサー位置決め部材７が介在した状態にあり、すなわち接続管１１の端部はシールリング５と非接触状態にあるので、接続管１１の端面にバリが生じていてもそのバリでシールリング５が傷付けられることはなく、シールリング５の損傷による流体漏れの発生を防止できる。 Thereafter, as shown in FIG. 4, the connection pipe 11 is inserted into the receiving portion 12 of the joint body 2 and the end thereof enters the connection pipe end receiving tube portion 7 b of the spacer positioning member 7 at the site construction. When inserted until it contacts the step portion 23, the retaining member 3 is pressed against the tapered surface 13 by the elastic force of the elastic body 4, and moves inward in the radial direction within the holding hole 15b of the collar 15, thereby engaging the teeth. 3a is strongly engaged with the outer peripheral surface of the connecting pipe 11. Therefore, even if an external force is applied in the direction in which the connecting pipe 11 is pulled out at this time, the connecting pipe 11 does not come out.
In addition, the spacer positioning member 7 is interposed between the seal ring 5 and the end of the connection pipe 11, that is, the end of the connection pipe 11 is not in contact with the seal ring 5. Even if burrs are formed on the end face of the seal ring, the seal ring 5 is not damaged by the burrs, and fluid leakage due to damage to the seal ring 5 can be prevented.

接続管１１を図４の挿入途中状態から更に図５の挿入途中過程を経て深く挿入すると、図２に示すように継手本体２と接続管１１とのシール接続状態が得られる。すなわち、図５に示すように接続管１１が継手本体２の途中まで挿入されると、抜止部材３の係合歯３ａが接続管１１の外周面に係合した状態で接続管１１は継手本体２の内奥へ押し込まれるとともに、スペーサー位置決め部材７が押し込まれ、この押し込みに伴い表示兼可動スペーサー６が弾性部材４の弾性復元力と相俟って確認孔１８の内側位置から継手本体内奥方向へ移動して退く。このように表示兼可動スペーサー６が確認孔１８から退くことにより確認孔１８から該表示兼可動スペーサー６が見えなくなるのを確認でき、これにより接続管１１が挿入されたことを確認できる。 When the connecting pipe 11 is inserted deeply from the insertion intermediate state of FIG. 4 through the insertion intermediate process of FIG. 5, a seal connection state between the joint body 2 and the connecting pipe 11 is obtained as shown in FIG. That is, as shown in FIG. 5, when the connecting pipe 11 is inserted partway into the joint body 2, the connecting pipe 11 is in a state where the engaging teeth 3 a of the retaining member 3 are engaged with the outer peripheral surface of the connecting pipe 11. 2, the spacer positioning member 7 is pushed in, and the display / movable spacer 6 is coupled with the elastic restoring force of the elastic member 4 from the inside of the confirmation hole 18 along with the pushing. Move in the direction and retreat. Thus, it can be confirmed that the display / movable spacer 6 disappears from the confirmation hole 18 by retreating the display / movable spacer 6 from the confirmation hole 18, thereby confirming that the connecting pipe 11 has been inserted.

図５のように、表示兼可動スペーサー６が確認孔１８から退くと、表示兼可動スペーサー６の戻り防止弾性爪６ｂがその弾性により径方向外方へ突出して継手本体２の確認孔１８よりも継手本体内奥側の内周に設けた凹部１７に係合する。このように表示兼可動スペーサー６を凹部１７に係合させておくと、接続管１１の挿入後に、図１１に示すような、内圧でシールリング５が受口部１２の方向へ移動するに伴い表示兼可動スペーサー６が確認孔１８の内側位置に押し戻されるという不具合な事態の発生を防止できる。したがって、接続管１１の挿入後に、表示兼可動スペーサー６が押し戻されて確認孔１８から見えることによる接続管１１の挿入未完了の誤認を防止できる。 As shown in FIG. 5, when the display / movable spacer 6 is retracted from the confirmation hole 18, the return preventing elastic claw 6 b of the display / movable spacer 6 protrudes outward in the radial direction due to its elasticity and is more than the confirmation hole 18 of the joint body 2. It engages with a recess 17 provided on the inner periphery of the inner side of the joint body. When the display / movable spacer 6 is engaged with the recess 17 as described above, as the seal ring 5 moves toward the receiving portion 12 by internal pressure as shown in FIG. It is possible to prevent the occurrence of a trouble that the display / movable spacer 6 is pushed back to the position inside the confirmation hole 18. Therefore, it is possible to prevent erroneous recognition of the incomplete insertion of the connection pipe 11 due to the display / movable spacer 6 being pushed back and visible from the confirmation hole 18 after the connection pipe 11 is inserted.

最後に、図２に示すように、接続管１１が、スペーサー位置決め部材７のシールリング保持筒部７ａが継手本体２内の第１の段部８ａに達する挿入完了位置まで挿入されると、シールリング５が接続管１１の外周面に圧縮状に密着して接続管１１の外周面と継手本体２の内周面との間を確実に密封シールする状態が得られ、これと同時に確認孔１８を密封シールする状態が得られるとともに、抜止部材３の係合歯３ａが接続管１１の外周面に係合した確実な抜止め状態が得られる。 Finally, as shown in FIG. 2, when the connecting pipe 11 is inserted to the insertion completion position where the seal ring holding cylinder portion 7a of the spacer positioning member 7 reaches the first step portion 8a in the joint body 2, A state is obtained in which the ring 5 is in close contact with the outer peripheral surface of the connection pipe 11 in a compressed manner to securely seal and seal between the outer peripheral surface of the connection pipe 11 and the inner peripheral surface of the joint body 2. Is obtained, and a reliable retaining state in which the engaging teeth 3a of the retaining member 3 are engaged with the outer peripheral surface of the connecting tube 11 is obtained.

こうした接続管１１の挿入完了状態は、表示兼可動スペーサー６が確認孔１８から消えて見えなくなるのを確認することによって確認することができる。したがって、接続管１１の挿入不足による内部流体の漏洩の発生を未然に防止することができる。 The insertion completion state of the connection pipe 11 can be confirmed by confirming that the display / movable spacer 6 disappears from the confirmation hole 18 and cannot be seen. Therefore, it is possible to prevent the internal fluid from leaking due to insufficient insertion of the connecting pipe 11.

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

接続管端部受け筒部７ｂを持つスペーサー位置決め部材７は更に次のような利点をも有する。すなわち、接続管１１の挿入長さが不足した場合には、図５のように接続管１１とシールリング５との間にスペーサー位置決め部材７の接続管端部受け筒部７ｂが介在し、接続管１１がシールリング５と非接触状態になるので、水圧試験でスペーサー位置決め部材７の内周面と接続管１１の外周面との間の隙間から接続管１１の外周面に沿って受口部１２の方向への微小な水漏れを検知することができる。この水漏れ検知により接続管１１の挿入不足を確認できる。 The spacer positioning member 7 having the connecting pipe end receiving tube portion 7b further has the following advantages. That is, when the insertion length of the connecting pipe 11 is insufficient, the connecting pipe end receiving tube portion 7b of the spacer positioning member 7 is interposed between the connecting pipe 11 and the seal ring 5 as shown in FIG. Since the tube 11 is in a non-contact state with the seal ring 5, a receiving portion is formed along the outer peripheral surface of the connecting tube 11 from the gap between the inner peripheral surface of the spacer positioning member 7 and the outer peripheral surface of the connecting tube 11 in the hydraulic pressure test. A minute water leak in the direction of 12 can be detected. Insufficient insertion of the connecting pipe 11 can be confirmed by this water leak detection.

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

図３に示すように、接続管１１を挿入する前、すなわち在庫、保管時には、スペーサー位置決め部材７のシールリング保持筒部７ａの外周に形成した凹溝２４に、自由状態のシールリング５の内径部を嵌まり込む状態にしている。これが、仮に、シールリング保持筒部７ａの外周にシールリング５の内径部を凹溝２４を設けずに嵌め込むとシールリング５の内径部が弾性変形（拡径）する。この状態で長期間放置されると、シールリング５には、いわゆる「ヘタリ現象」が生じて圧縮永久歪が残留し、荷重が除去されても内径が元の寸法に復帰せず、耐用年数の低下をもたらすが、図３に示すように自由状態のシールリング５の内径部がシールリング保持筒部７ａの外周に形成した凹溝２４に嵌まり込む装着状態では、シールリング５には内部応力が発生せず、シールリング５は接続管１１が挿入されたときにはじめて弾性的に拡径して接続管１１の外周に密着するので、適切な圧縮代が長期間にわたり維持され、所定の耐用年数を保証することができる。 As shown in FIG. 3, the inner diameter of the seal ring 5 in the free state is inserted into the groove 24 formed in the outer periphery of the seal ring holding cylinder portion 7a of the spacer positioning member 7 before inserting the connecting pipe 11, that is, in stock and storage. The part is fitted. If this is done, the inner diameter portion of the seal ring 5 is elastically deformed (expanded) when the inner diameter portion of the seal ring 5 is fitted to the outer periphery of the seal ring holding cylinder portion 7a without providing the concave groove 24. If left in this state for a long period of time, a so-called “sagging phenomenon” occurs in the seal ring 5 and a permanent compression strain remains. Even if the load is removed, the inner diameter does not return to the original dimension, and the service life of the seal ring 5 is reduced. As shown in FIG. 3, in the mounted state in which the inner diameter portion of the seal ring 5 in the free state is fitted into the concave groove 24 formed on the outer periphery of the seal ring holding cylinder portion 7a as shown in FIG. The seal ring 5 is elastically expanded only when the connecting pipe 11 is inserted and is in close contact with the outer periphery of the connecting pipe 11, so that an appropriate compression allowance is maintained over a long period of time and a predetermined durability The number of years can be guaranteed.

上記実施例では表示兼可動スペーサー６とスペーサー位置決め部材７とを別体に形成するが、これに代えて、表示兼可動スペーサー６とスペーサー位置決め部材７とを容易に切り離し可能な繋ぎ部を介して一体に形成したものであってもよい。この場合、接続管１１の挿入完了直前に接続管１１を挿入する力で前記繋ぎ部が引き千切られてスペーサー位置決め部材７が表示兼可動スペーサー６から分離することになる。
また、上記実施例では、継手本体２の一端に受口部１２を、他端の外周に接続用雄ねじＳを形成した雄ねじアダプター管継手について記述したが、本発明はこれに限られず、他の構造、例えば、両端に受口部を有する左右対称のソケット形管継手や、エルボ型管継手等にも適用できることは勿論である。また、接続管１１としては、ステンレス鋼管等の金属管に限られず、樹脂製の接続管、例えば塩化ビニール製の接続管などにも適用することができる。 In the above-described embodiment, the display / movable spacer 6 and the spacer positioning member 7 are formed separately. It may be formed integrally. In this case, the connecting portion is torn off by the force of inserting the connecting tube 11 just before the insertion of the connecting tube 11, and the spacer positioning member 7 is separated from the display / movable spacer 6.
Moreover, in the said Example, although the receptacle part 12 was formed in the one end of the coupling main body 2, and the external thread adapter S was formed in the outer periphery of the other end, it described, but this invention is not limited to this, Needless to say, the present invention can also be applied to structures such as symmetrical socket-type pipe joints having elbows at both ends, elbow-type pipe joints, and the like. Further, the connecting pipe 11 is not limited to a metal pipe such as a stainless steel pipe, and can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

本発明の一実施例の管継手の斜視図である。It is a perspective view of the pipe joint of one example of the present invention. 接続管の挿入完了後の状態を示す同管継手の半欠截断面図である。FIG. 5 is a half-broken cross-sectional view of the pipe joint showing a state after the connection pipe is completely inserted. 接続管を挿入する前の状態を示す同管継手の半欠截断面図である。FIG. 6 is a half-broken cross-sectional view of the pipe joint showing a state before the connection pipe is inserted. 接続管の挿入途中の状態を示す同管継手の半欠截断面図である。FIG. 6 is a half-broken cross-sectional view of the pipe joint showing a state during the insertion of the connecting pipe. 接続管を更なる挿入途中の状態を示す同管継手の半欠截断面図である。It is a half cut-out cross-sectional view of the pipe joint showing a state in which the connecting pipe is further inserted. 同管継手の表示兼可動スペーサーの斜視図である。It is a perspective view of the display and movable spacer of the pipe joint. （ａ）は同管継手のスペーサー位置決め部材の斜視図、（ｂ）は同スペーサー位置決め部材の一部拡大断面図である。(A) is a perspective view of the spacer positioning member of the pipe joint, and (b) is a partially enlarged sectional view of the spacer positioning member. 同管継手のカラーの平面図である。It is a top view of the color of the pipe joint. 同カラーの正面図である。It is a front view of the same color. 同カラーの断面図である。It is sectional drawing of the same color. 不具合な状態を図２に相応して示す管継手の半欠截断面図である。FIG. 3 is a half-broken cross-sectional view of a pipe joint showing a troubled state corresponding to FIG. 2. 従来例の管継手の半欠截断面図である。It is a half notched cross-sectional view of a conventional pipe joint.

符号の説明Explanation of symbols

１管継手
２継手本体
３抜止部材
４弾性部材
５シールリング
６表示兼可動スペーサー
７スペーサー位置決め部材
７ａシールリング保持筒部
７ｂ接続管端部受け筒部
１１接続管
１２受口部
１３テーパ面
１８確認孔
２４凹溝
DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 3 Detachment member 4 Elastic member 5 Seal ring 6 Display / movable spacer 7 Spacer positioning member 7a Seal ring holding | maintenance cylinder part 7b Connection pipe end receiving cylinder part 11 Connection pipe 12 Receiving part 13 Tapered surface 18 Confirmation Hole 24 groove

Claims

少なくとも一端部に接続管の端部を受け入れる受口部を有し、かつ該受口部寄りの円周上の少なくとも一箇所に確認孔を内外貫通状に設けた継手本体内に、前記受口部から継手本体内奥に向かって順に、前記接続管の外周面に係合される抜止部材と、前記抜止部材側に後端部を当接係合して該抜止部材を受口部の内周に向かって押圧付勢する弾性部材と、前記確認孔の内側位置に配置され、前記弾性部材の先端部に係合する環状の表示兼可動スペーサーと、前記表示兼可動スペーサーを前記確認孔の内側位置に位置決め保持するスペーサー位置決め部材と、前記接続管の外周面に密着するシールリングを収容しており、
前記受口部の内周に、前記抜止部材の当接により該抜止部材に径方向内方への移動作用を加えるテーパ面を受口部外方に向かって窄まり状に形成しており、
前記スペーサー位置決め部材は、前記接続管の挿入に伴い該接続管の端部で継手本体内奥へ押し込まれるようになし、このスペーサー位置決め部材の押し込みに伴い前記表示兼可動スペーサーが前記確認孔の内側位置から継手本体内奥側へ移動して退くように構成してあることを特徴とする、管継手。 In the joint main body having a receiving portion for receiving the end of the connecting pipe at least at one end, and having a confirmation hole formed in the inner and outer through-holes in at least one place on the circumference near the receiving portion, the receiving port In order from the inner part to the inner part of the joint body, a retaining member that is engaged with the outer peripheral surface of the connection pipe, and a rear end portion is brought into contact with and engaged with the retaining member side so that the retaining member is placed inside the receiving part. An elastic member that presses and urges toward the periphery, an annular display / movable spacer that is disposed at an inner position of the confirmation hole and engages with a tip portion of the elastic member, and the display / movable spacer is attached to the confirmation hole. It contains a spacer positioning member that is positioned and held at the inner position, and a seal ring that is in close contact with the outer peripheral surface of the connecting pipe,
On the inner periphery of the receiving part, a tapered surface that applies a moving action radially inward to the retaining member by contact of the retaining member is formed in a constricted shape toward the outer side of the receiving part,
The spacer positioning member is pushed into the joint body at the end of the connecting pipe as the connecting pipe is inserted, and the display / movable spacer is located inside the confirmation hole as the spacer positioning member is pushed. A pipe joint, wherein the pipe joint is configured to move from the position to the inner side of the joint body and retract.

前記スペーサー位置決め部材は、前記接続管の端部に外嵌可能なスリーブ形状に形成されている、請求項１記載の管継手。 The pipe joint according to claim 1, wherein the spacer positioning member is formed in a sleeve shape that can be fitted onto an end of the connection pipe.

前記スペーサー位置決め部材は、内径が前記接続管の内径と略同一径に形成されたシールリング保持筒部と、このシールリング保持筒部の後端側に一体に連設され、内径が前記接続管の外径よりも大きく形成されて前記接続管の端部に外嵌可能な接続管端部受け筒部とを有する形に形成されている、請求項２記載の管継手。 The spacer positioning member is integrally connected to a seal ring holding cylinder part having an inner diameter substantially the same as the inner diameter of the connection pipe, and a rear end side of the seal ring holding cylinder part, and the inner diameter is the connection pipe. The pipe joint according to claim 2, wherein the pipe joint is formed in a shape having a connecting pipe end receiving tube portion that is formed larger than the outer diameter of the connecting pipe and can be fitted onto the end portion of the connecting pipe.

前記シールリング保持筒部の外周に、自由状態の前記シールリングの内径部が嵌まり込む凹溝を形成している、請求項３記載の管継手。 The pipe joint according to claim 3, wherein a concave groove into which an inner diameter portion of the seal ring in a free state is fitted is formed on an outer periphery of the seal ring holding cylinder portion.

前記表示兼可動スペーサーの後端側にはその弾性により径方向外方へ張り出す戻り防止弾性爪を設け、前記継手本体の前記確認孔よりも継手本体内奥側の内周に、前記表示兼可動スペーサーが前記確認孔の内側位置から退くに伴い前記戻り防止弾性爪が係合する凹部を設けている、請求項１ないし４のいずれか１項に記載の管継手。

On the rear end side of the display / movable spacer, there is provided a return prevention elastic claw that projects outward in the radial direction due to its elasticity, and the display / moving spacer is arranged on the inner periphery of the joint body behind the confirmation hole. The pipe joint according to any one of claims 1 to 4, wherein a concave portion with which the return-preventing elastic claw is engaged as the movable spacer retracts from the inner position of the confirmation hole is provided.