JP4719176B2

JP4719176B2 - Pipe fitting

Info

Publication number: JP4719176B2
Application number: JP2007083514A
Authority: JP
Inventors: 智和萩野
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 2007-03-28
Filing date: 2007-03-28
Publication date: 2011-07-06
Anticipated expiration: 2027-03-28
Also published as: JP2008240928A

Description

本発明は、管継手に関する。 The present invention relates to a pipe joint.

被接続用のパイプの端部に挿入されるリング状シール材が装着される周溝が外周面に形成された挿入筒部（ニップルあるいはノズルともいう）を備え、前記周溝に装着されたリング状シール材が、前記パイプの内周面またはパイプの先端部に装着されたガイド筒の内周面に、水密に圧接された状態でパイプが接続される管継手がある。 A ring having an insertion tube portion (also referred to as a nipple or a nozzle) in which a circumferential groove to which a ring-shaped sealing material to be inserted at the end of a pipe to be connected is attached is formed on the outer peripheral surface, and is attached to the circumferential groove There is a pipe joint in which a pipe is connected in a state where the pipe-like sealing material is pressed in a watertight manner on the inner peripheral surface of the pipe or the inner peripheral surface of a guide cylinder attached to the tip of the pipe.

この種の管継手の場合、パイプが所定の位置まで挿入されていなくてもシール材の一部とパイプとが接触していると一時的に止水して水圧テストでは施工不良がわからないが、長期的な脈動などにより止水性がなくなり施工後に漏水する場合がある。
そこで、たとえば、挿入筒部の外側を囲繞するように設けられる部材を透明部材で形成し、パイプが正常な位置まで挿入されたかを外部から視認できるようにした管継手を本発明の出願人らがすでに提案している(特許文献１参照)。 In the case of this type of pipe joint, even if the pipe is not inserted up to a predetermined position, if a part of the sealing material is in contact with the pipe, the water will be temporarily stopped and the hydraulic test will not show the construction failure. Due to long-term pulsation etc., there is a possibility that the water stoppage disappears and water leaks after construction.
In view of this, for example, the applicants of the present invention provide a pipe joint in which a member provided so as to surround the outer side of the insertion tube portion is formed of a transparent member so that whether a pipe is inserted to a normal position can be visually recognized from the outside. Has already proposed (see Patent Document 1).

しかしながら、上記管継手の場合、パイプが正常に接続されたことを視認すれば、施工後の施工不良による漏水を確実に防ぐことができるのであるが、施工を行なう作業者は、かならずしも熟練者ではない場合があり、作業後に視認を怠ってしまい、施工不良の状態で工事を終了してしまう恐れがある。
したがって、上記のような管継手でも、施工不良による施工後の漏水を完全に防止することができない。 However, in the case of the above-mentioned pipe joint, if it is visually confirmed that the pipe is normally connected, it is possible to reliably prevent water leakage due to poor construction after construction. In some cases, there is no possibility of visual recognition after work, and there is a risk that the work will be finished in a poorly constructed state.
Therefore, even the above-described pipe joint cannot completely prevent water leakage after construction due to construction failure.

この問題を解消するために、パイプを挿入可能で筒状の挿入筒部が形成された継手本体と、前記挿入筒部の外周面に設けられた周溝に装着され、挿入されたパイプの内周面と挿入筒部の外周面との間をシールするリング状シール部材と、前記挿入筒部に外嵌され、パイプの案内部への接続をガイドする挿入ガイド（筒状アダプタとも称される）と、前記継手本体に結合され、挿入筒部を覆うナットと、このナットと挿入筒部との間に装着され、パイプの継手本体からの抜け出しを防止するためのスリット付きの締付環体とを備え、前記挿入ガイドはシール部材に外嵌する被覆部が形成され、この被覆部の一部にパイプとのシールを防止するための漏水発生部を設けたことを特徴とする管継手が提案されている（特許文献２参照）。 In order to solve this problem, a joint body in which a pipe can be inserted and a cylindrical insertion cylinder part is formed, and a circumferential groove provided on the outer peripheral surface of the insertion cylinder part are mounted and inserted in the inserted pipe. A ring-shaped seal member that seals between the peripheral surface and the outer peripheral surface of the insertion tube portion, and an insertion guide (also referred to as a cylindrical adapter) that is externally fitted to the insertion tube portion and guides connection to the guide portion of the pipe ) And a nut that is coupled to the joint body and covers the insertion cylinder part, and a fastening ring with a slit that is mounted between the nut and the insertion cylinder part to prevent the pipe from coming out of the joint body A pipe joint characterized in that the insertion guide is formed with a covering portion that fits around the seal member, and a water leakage generating portion for preventing a seal with the pipe is provided in a part of the covering portion. It has been proposed (see Patent Document 2).

即ち、この管継手は、パイプ先端部に挿入される筒部に漏水発生部として複数のスリット状の切欠を設け、パイプが正常な挿入位置まで挿入されない場合、この切欠部を通って漏水するようにしている。
しかしながら、通常挿入ガイドは、金属製の薄肉板材を打ち抜きプレス加工を施すことによって得られるため、切欠部周縁を面取加工等を施して置かなければ、パイプ表面やシール材を傷つけたりする恐れがあり、加工工数が煩雑である。 That is, this pipe joint is provided with a plurality of slit-like notches as a water leakage generating part in the cylinder part inserted into the pipe tip part, and when the pipe is not inserted to the normal insertion position, water leaks through the notch part. I have to.
However, since the insertion guide is usually obtained by punching a metal thin plate and pressing it, the pipe surface and seal material may be damaged unless the periphery of the notch is chamfered. Yes, processing man-hours are complicated.

また、切欠が設けられているため、継手本体に挿入ガイドをセットする際に筒部が塑性変形しやすく、変形された状態で挿入ガイドがセットされていると、パイプ挿入時に挿入ガイドの筒部がパイプの所定位置まで入り込まない。
したがって、このような挿入ガイドをパイプの端部を弾発的な締め付け力で締め付けるためのスリット付きの締付環体と、この締付環体の弾発力に抗して締付環体を拡径するように前記スリットの端部に離脱可能に挾持されるとともに、パイプが正常挿入位置に配置されると、離脱する拡径片とを備えた管継手に採用した場合、上記のようにパイプ挿入時に挿入ガイドの筒部がパイプの所定位置まで入り込まない状態でパイプが所定位置に挿入される前に拡径片が挿入ガイドの作用によって離脱して締付環体が縮径して正常な接続ができなくなってしまう恐れがある。 In addition, since the notch is provided, the cylindrical portion is easily plastically deformed when the insertion guide is set in the joint body. If the insertion guide is set in a deformed state, the cylindrical portion of the insertion guide is inserted when the pipe is inserted. Does not enter the pipe.
Therefore, a fastening ring with a slit for fastening such an insertion guide to the end of the pipe with a resilient fastening force, and a fastening ring against the resilient force of this fastening ring. When it is adopted in a pipe joint that is detachably held at the end of the slit so as to expand the diameter, and when the pipe is disposed at the normal insertion position, the pipe is provided with a diameter expanding piece that is detached as described above. When the pipe is not inserted into the pipe at the predetermined position when the pipe is inserted, the diameter expanding piece is detached by the action of the insertion guide before the pipe is inserted into the predetermined position, and the tightening ring is reduced in diameter. There is a risk that it will be impossible to make a secure connection.

特許3843288号公報Japanese Patent No. 3843288 特開2005-90531号公報JP 2005-90531 A

本発明は、上記事情に鑑みて、水圧テスト時に施工不良が確実に検知できる管継手を提供することを目的としている。 In view of the above circumstances, an object of the present invention is to provide a pipe joint that can reliably detect a construction failure during a water pressure test.

上記目的を達成するために、本発明の請求項１に記載の管継手（以下、「請求項１の管継手」と記す）は、被接続用のパイプの端部に挿入されるリング状シール材が装着される周溝が外周面に形成された挿入筒部を備え、前記周溝に装着されたリング状シール材が、前記パイプの内周面に、水密に圧接された状態でパイプが接続される管継手において、前記周溝の内壁面に、前記挿入筒部の内外に連通し、前記パイプが正常挿入位置に配置されたときのみに、前記パイプの内周面からの圧力により前記リング状シール材が水密に圧接される貫通孔を備えていることを特徴としている。
本発明の請求項２に記載の管継手（以下、「請求項２の管継手」と記す）は、被接続用のパイプの端部に挿入されるリング状シール材が装着される周溝が外周面に形成された挿入筒部を備え、前記周溝に装着されたリング状シール材が、前記パイプの内周面に、水密に圧接された状態でパイプが接続される管継手において、パイプ内側に挿入される筒部と、この筒部の一端から外側に延出しパイプの内径より大きな外径のフランジ部とを有してパイプ先端に装着される筒状アダプタを備え、前記挿入筒部には、前記リング状シール材より奥側の周溝に挿入確認用シール材が装着され、このシール材の下方には挿入筒部の内外に連通する貫通孔が設けられていて、この貫通孔は、筒状アダプタがパイプ先端に装着された状態でパイプが正常挿入位置に配置されたときのみに、前記筒状アダプタの筒部内周面からの圧力により前記挿入確認用シール材が圧接されて水密に封鎖されることを特徴としている。
本発明の請求項３に記載の管継手（以下、「請求項３の管継手」と記す）は、請求項１または請求項２の管継手において、パイプの端部を弾発的な締め付け力で締め付けるためのスリット付きの締付環体と、この締付環体の弾発力に抗して締付環体を拡径するように前記スリットの端部に離脱可能に挾持されるとともに、パイプが正常挿入位置に配置されると、離脱する拡径片とを備えていることを特徴としている。
本発明の請求項４に記載の管継手（以下、「請求項４の管継手」と記す）は、請求項３の管継手において、拡径片の外径方向への飛び動作を抑制するように締付環体に外嵌されると共に挿入されるパイプの先端部に当接して軸心内方向へスライドして前記拡径片の外径方向への飛び動作を許す規制スリーブを備えていることを特徴としている。
本発明の請求項５に記載の管継手（以下、「請求項５の管継手」と記す）は、請求項４の管継手において、規制スリーブと筒状アダプタとが一体化されていることを特徴としている。 In order to achieve the above object, a pipe joint according to claim 1 of the present invention (hereinafter referred to as "pipe joint of claim 1") is a ring-shaped seal inserted into an end of a pipe to be connected. The pipe includes a ring-shaped sealing material attached to the circumferential groove in a watertight pressure-contact manner with the inner circumferential surface of the pipe. In the pipe joint to be connected, the inner wall surface of the circumferential groove communicates with the inside and outside of the insertion tube portion, and only when the pipe is disposed at the normal insertion position, the pressure from the inner circumferential surface of the pipe The ring-shaped sealing material is provided with a through-hole that is pressure-contacted in a watertight manner.
The pipe joint according to claim 2 of the present invention (hereinafter referred to as “the pipe joint of claim 2”) has a circumferential groove in which a ring-shaped sealing material inserted into an end of a pipe to be connected is mounted. In a pipe joint that includes an insertion tube portion formed on an outer peripheral surface, and in which a ring-shaped sealing material attached to the peripheral groove is connected in a watertight manner to the inner peripheral surface of the pipe, A cylindrical adapter that is inserted inside and has a cylindrical adapter that extends outward from one end of the cylindrical portion and has an outer diameter flange that is larger than the inner diameter of the pipe; Is fitted with a sealing material for insertion confirmation in a circumferential groove on the back side of the ring-shaped sealing material, and a through-hole communicating with the inside and outside of the insertion tube portion is provided below the sealing material. The pipe is inserted normally with the cylindrical adapter attached to the pipe tip. Only when placed location, the insertion verifier sealing material by the pressure from the cylinder inner peripheral surface of the tubular adapter is characterized in that it is sealed in a watertight manner is pressure.
The pipe joint according to claim 3 of the present invention (hereinafter referred to as “the pipe joint according to claim 3”) is the pipe joint according to claim 1 or 2, wherein the pipe end is elastically tightened. A tightening ring with a slit for tightening with, and being detachably held at the end of the slit so as to expand the diameter of the tightening ring against the elastic force of the tightening ring, When the pipe is disposed at the normal insertion position, the pipe is provided with a diameter-expanding piece that is detached.
The pipe joint according to claim 4 of the present invention (hereinafter referred to as “the pipe joint according to claim 4”) suppresses the jumping operation in the outer diameter direction of the expanded piece in the pipe joint according to claim 3. And a regulating sleeve that abuts on the end of the pipe that is externally fitted to the fastening ring and slides inwardly in the axial center to allow the enlarged diameter piece to fly in the outer radial direction. It is characterized by that.
The pipe joint according to claim 5 of the present invention (hereinafter referred to as "the pipe joint of claim 5") is the pipe joint according to claim 4, wherein the regulation sleeve and the cylindrical adapter are integrated. It is a feature.

本発明の請求項１の管継手は、以上のように、周溝の内壁面に、前記挿入筒部の内外に連通し、前記パイプが正常挿入位置に配置されたときのみに、前記パイプの内周面からの圧力により圧接される前記リング状シール材によって水密に封鎖される貫通孔を備えているので、パイプの挿入不足があった場合、水圧テストをすると、配管内の水が貫通孔を介して挿入筒部の外側に漏れ出る。したがって、施工不良を水圧テストの段階で確実に検知して、施工不良による施工後の漏水事故を防止することができる。 As described above, the pipe joint according to the first aspect of the present invention communicates with the inner wall surface of the circumferential groove on the inside and outside of the insertion tube portion, and only when the pipe is disposed at the normal insertion position. Since it has a through hole that is sealed watertight by the ring-shaped sealing material that is pressed by pressure from the inner peripheral surface, if there is insufficient insertion of the pipe, water in the pipe will pass through the through hole. Leaks out of the insertion tube through Therefore, it is possible to reliably detect a construction failure at the water pressure test stage and prevent a water leakage accident after construction due to the construction failure.

本発明の請求項２の管継手は、パイプ内側に挿入される筒部と、この筒部の一端から外側に延出しパイプの内径より大きな外径のフランジ部とを有してパイプ先端に装着される筒状アダプタを備え、前記挿入筒部には、前記リング状シール材より奥側の周溝に挿入確認用シール材が装着され、このシール材の下方には挿入筒部の内外に連通する貫通孔が設けられていて、この貫通孔は、筒状アダプタがパイプ先端に装着された状態でパイプが正常挿入位置に配置されたときのみに、前記筒状アダプタの筒部内周面からの圧力により前記挿入確認用シール材が圧接されて水密に封鎖されるようになっているので、正常位置までパイプが挿入されないと、即ち、パイプの挿入不足があった場合、水圧テストをすると、配管内の水が貫通孔を介して挿入筒部の外側に漏れ出る。したがって、施工不良を水圧テストの段階で確実に検知して、施工不良による施工後の漏水事故を防止することができる。
また、筒状アダプタを備えているので、パイプの先端が斜め切り状態になっていても、シール材を傷つけたりすることなく、パイプを挿入筒部に挿入することができる。 The pipe joint according to claim 2 of the present invention has a cylindrical portion inserted inside the pipe and a flange portion that extends outward from one end of the cylindrical portion and has an outer diameter larger than the inner diameter of the pipe. The insertion tube portion is provided with an insertion confirmation seal material in a circumferential groove on the inner side of the ring-shaped seal material , and the insertion tube portion communicates with the inside and outside of the insertion tube portion below the seal material. The through-hole is provided from the inner peripheral surface of the cylindrical portion of the cylindrical adapter only when the pipe is disposed at the normal insertion position with the cylindrical adapter being attached to the tip of the pipe. Since the sealing material for confirmation of insertion is pressed and sealed in a water-tight manner by pressure, if the pipe is not inserted to the normal position, that is, if there is insufficient insertion of the pipe, a water pressure test is performed. The water inside the through hole Leaking to the outside of the inlet tube portion. Therefore, it is possible to reliably detect a construction failure at the water pressure test stage and prevent a water leakage accident after construction due to the construction failure.
Moreover, since the cylindrical adapter is provided, the pipe can be inserted into the insertion cylinder portion without damaging the sealing material even when the tip of the pipe is in an obliquely cut state.

請求項３の管継手は、パイプの端部を弾発的な締め付け力で締め付けるためのスリット付きの締付環体と、この締付環体の弾発力に抗して締付環体を拡径するように前記スリットの端部に離脱可能に挾持されるとともに、パイプが正常挿入位置に配置されると、離脱する拡径片とを備えているので、パイプが正常挿入位置まで挿入されると、締付環体が縮径してパイプの端部を挿入筒部側に締め付けて、パイプを継手本体にワンタッチでしっかりと固定できる。 According to a third aspect of the present invention, there is provided a pipe joint including a tightening ring with a slit for tightening an end of a pipe with a resilient tightening force, and a tightening ring against the resilient force of the tightening ring. It is removably held at the end of the slit so as to expand the diameter, and is provided with a diameter-expanding piece that is detached when the pipe is placed at the normal insertion position, so that the pipe is inserted to the normal insertion position. Then, the diameter of the tightening ring is reduced, and the end of the pipe is tightened to the insertion tube portion side, so that the pipe can be firmly fixed to the joint body with one touch.

請求項４の管継手は、拡径片の外径方向への飛び動作を抑制するように締付環体に外嵌されると共に挿入されるパイプの先端部に当接して軸心内方向へスライドして前記拡径片の外径方向への飛び動作を許す規制スリーブを備えているので、管継手を輸送等の最中に拡径片が離脱して、パイプ接続時に締付環体が縮径した状態でパイプが挿入できないといった事故を防止できる。 According to a fourth aspect of the present invention, the pipe joint is fitted on the fastening ring body so as to suppress the jumping operation of the diameter-expanding piece in the outer diameter direction and abuts on the tip of the inserted pipe so as to move in the axial direction. Since it has a regulating sleeve that slides to allow the enlarged diameter piece to fly in the outer diameter direction, the enlarged diameter piece is detached during transportation of the pipe joint, and the tightening ring is connected when the pipe is connected. An accident that the pipe cannot be inserted in a reduced diameter state can be prevented.

請求項５の管継手は、規制スリーブと筒状アダプタとが一体化されているので、部品点数が少なくなり、管継手の組立作業が容易となる。 In the pipe joint of the fifth aspect, since the regulation sleeve and the cylindrical adapter are integrated, the number of parts is reduced and the assembly work of the pipe joint is facilitated.

以下に、本発明を、その実施の形態をあらわす図面を参照しつつ詳しく説明する。 Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.

図１に、本発明に係る管継手の第１の実施の形態であってパイプの未接続状態の縦断面図を示し、図２に、パイプを正常挿入位置で接続した状態の縦断面図を示している。
図１及び図２に示すように、本管継手Ｊは、被接続用のパイプ１の端部に挿入される継手本体２と、継手本体２に外嵌されたパイプ１の端部を締め付けるためのスリット30付きの締付環体３と、締付環体３のスリット30に離脱可能に挟持されると共に挿入されるパイプ１の先端部に当接して離脱する拡径片４と、締付環体３を包囲すると共に継手本体２に回転自在に外嵌される透明な筒状カバー部材５と、を備えている。 FIG. 1 shows a longitudinal sectional view of a pipe joint according to the first embodiment of the present invention in a non-connected state of a pipe, and FIG. 2 shows a longitudinal sectional view of a state in which the pipe is connected at a normal insertion position. Show.
As shown in FIGS. 1 and 2, the main pipe joint J is used to fasten the joint body 2 inserted into the end of the pipe 1 to be connected and the end of the pipe 1 fitted on the joint body 2. A tightening ring 3 with a slit 30, a diameter-enlarging piece 4 that is releasably held in the slit 30 of the tightening ring 3 and that comes into contact with the tip of the inserted pipe 1, and is tightened A transparent cylindrical cover member 5 that surrounds the ring body 3 and is rotatably fitted to the joint body 2.

パイプ１は、給水、給湯用等に用いられ、例えば、架橋ポリエチレン又はポリブテン等の合成樹脂材から成る。 The pipe 1 is used for water supply, hot water supply, etc., and is made of, for example, a synthetic resin material such as crosslinked polyethylene or polybutene.

継手本体２は、金属製であり、その一端側に、パイプ１の端部に挿入される挿入筒部20を有し、挿入筒部20の外周面には、パイプ１を抜け止め状態に掛止するための複数の環状抜止突条部が同心円状に並設されると共に、（Ｏリング等の）シール材21が装着される２条の周溝22…が設けられている。
奥側の周溝22には、底に管軸を挟んで対称位置の２箇所に挿入筒部２０の内外を連通する貫通孔22ａが穿設されている。
また、継手本体２の他端側には、例えば、（図示省略の）接続対象となる部材に、螺合する雄ネジ23が形成されている。 The joint body 2 is made of metal, and has an insertion tube portion 20 inserted into the end portion of the pipe 1 on one end side thereof. The pipe 1 is hooked on the outer peripheral surface of the insertion tube portion 20. A plurality of annular retaining protrusions for stopping are arranged concentrically in parallel, and two circumferential grooves 22... For mounting a seal material 21 (such as an O-ring) are provided.
In the circumferential groove 22 on the back side, through holes 22a communicating with the inside and the outside of the insertion tube portion 20 are formed at two symmetrical positions with the tube axis on the bottom.
Further, on the other end side of the joint body 2, for example, a male screw 23 that is screwed into a member to be connected (not shown) is formed.

締付環体３は、炭素鋼やバネ鋼等から成り、軸心方向のスリット（切割部）30を有し、後で詳述するように、スリット30間に配置した拡径片４が取り除かれた状態で挿入筒部20に外嵌されたパイプ１の端部をパイプ接続状態で弾発的な締付力で締め付けるようになっている。 The tightening ring 3 is made of carbon steel, spring steel, or the like, and has a slit (cut portion) 30 in the axial direction. As will be described in detail later, the enlarged diameter piece 4 disposed between the slits 30 is removed. In this state, the end portion of the pipe 1 that is externally fitted to the insertion tube portion 20 is tightened with a resilient tightening force in a pipe connection state.

拡径片４は、炭素鋼等の高剛性な鋼材からなり、図１に示す初期状態（パイプ未接続状態）にて、締付環体３の弾発力に抗して、締付環体３のスリット30に離脱可能に挟圧され、締付環体３を、パイプ１の挿入が可能な程度に拡径している。さらに、拡径片４は、図１の状態から図２のように、挿入されるパイプ１により、挟持されているスリット30から軸心方向外方へ押し出されて、離脱し、締付環体３の縮径を可能とし、締付環体３の弾発付勢力にて、パイプ１を締め付ける。 The diameter-expanding piece 4 is made of a highly rigid steel material such as carbon steel, and is fastened against the elastic force of the fastening ring 3 in the initial state shown in FIG. The clamping ring 3 is squeezed by the three slits 30 so as to be detachable, and the diameter of the fastening ring 3 is expanded to the extent that the pipe 1 can be inserted. Further, as shown in FIG. 2, the diameter-expanding piece 4 is pushed out from the slit 30 sandwiched by the inserted pipe 1 outwardly in the axial direction, and is separated from the clamp ring. The pipe 1 is tightened by the elastic biasing force of the tightening ring 3.

筒状カバー部材５は、透明樹脂材からなり、例えば、線膨張係数が（金属に近い程に）小さく、強度、耐熱性、耐薬品性に優れたポリサルフォン（ＰＳＦ）樹脂からなる。 The cylindrical cover member 5 is made of a transparent resin material, and is made of, for example, a polysulfone (PSF) resin having a small linear expansion coefficient (as it is closer to a metal) and excellent in strength, heat resistance, and chemical resistance.

筒状カバー部材５は、拡径部５ａと縮径部５ｂとから成り、縮径部５ｂの内周面６に設けられた突条部８が、挿入筒部20の基端部（他端部）に設けられた凹周溝24に抜け止め状に嵌め込まれ、筒状カバー部材５が継手本体２に回転自在となる。そして、拡径部５ａの内周面６と、挿入筒部20の外周面と、の間には、拡径状態の締付環体３とパイプ１との挿入を可能にする程度の間隙部が設けられている。なお、縮径部５ｂに凹周溝を設け、挿入筒部20に突条部を設けてもよい。 The cylindrical cover member 5 includes an enlarged diameter portion 5a and a reduced diameter portion 5b, and the protrusion 8 provided on the inner peripheral surface 6 of the reduced diameter portion 5b is connected to the proximal end portion (the other end of the insertion cylinder portion 20). The cylindrical cover member 5 is rotatably fitted to the joint body 2 by being fitted in a concave circumferential groove 24 provided in the portion). Between the inner peripheral surface 6 of the enlarged diameter portion 5a and the outer peripheral surface of the insertion cylinder portion 20, there is a gap portion that allows insertion of the tightened ring 3 and the pipe 1 in an enlarged state. Is provided. In addition, a concave circumferential groove may be provided in the reduced diameter portion 5b, and a protrusion may be provided in the insertion tube portion 20.

拡径部５ａの開口側には、内鍔部９ａを有する抜止カバー９が外嵌状に取り付けられている。即ち、拡径部５ａの外周面に設けられた凹周溝10に、抜止カバー９の内周面に設けられた突条部11が、抜け止め状に嵌め込まれている。また、金属製の抜止カバー９は、筒状カバー部材５に（冷間）圧入されており、抜止カバー９は、筒状カバー部材５に対して空転しない。なお、抜止カバー９を筒状カバー部材５に螺着するようにしてもよい。 On the opening side of the enlarged diameter portion 5a, a retaining cover 9 having an inner flange portion 9a is attached in an outer fitting shape. That is, the ridge 11 provided on the inner peripheral surface of the retaining cover 9 is fitted in the concave peripheral groove 10 provided on the outer peripheral surface of the enlarged diameter portion 5a in a retaining shape. Further, the metal retaining cover 9 is press-fitted into the cylindrical cover member 5 (cold), and the retaining cover 9 does not idle with respect to the cylindrical cover member 5. The retaining cover 9 may be screwed onto the cylindrical cover member 5.

この抜止カバー９により、本管継手Ｊに接続されたパイプ１に、引抜力が掛かっても、締付環体３等が、抜止カバー９の内鍔部９ａに当接して動きを抑制される。また、抜止カバー９を掴持して回動させても、筒状カバー部材５を共に回動させることができる。即ち、筒状カバー部材５と継手本体２との回転摩擦抵抗力よりも、抜止カバー９の筒状カバー部材５への圧接力が大きい。 Even if a pulling force is applied to the pipe 1 connected to the main pipe joint J, the retaining ring 9 abuts against the inner flange portion 9a of the retaining cover 9 so that the movement is suppressed. . Even if the retaining cover 9 is gripped and rotated, the cylindrical cover member 5 can be rotated together. That is, the pressure contact force of the retaining cover 9 to the cylindrical cover member 5 is greater than the rotational frictional resistance force between the cylindrical cover member 5 and the joint body 2.

そして、本管継手Ｊは、筒状カバー部材５の内部に、拡径片４にて拡径された締付環体３等を装着した後に、抜止カバー９を筒状カバー部材５に圧着してから、筒状カバー部材５を継手本体２に取り付けることによって組み立てられる。 The main pipe joint J is attached to the tubular cover member 5 after the fastening ring 9 and the like having the diameter expanded by the diameter-enlarging piece 4 are mounted inside the cylindrical cover member 5. After that, the cylindrical cover member 5 is assembled by attaching it to the joint body 2.

なお、拡径片４を挟持している締付環体３は、筒状カバー部材５の内部に、軸方向位置決め機構Ｋを介して、軸心方向への動きを抑制され、筒状カバー部材５と共に軸心廻りに回転するように設けられている。 The tightening ring 3 holding the diameter-expanding piece 4 is restrained from moving in the axial direction inside the cylindrical cover member 5 via the axial positioning mechanism K, so that the cylindrical cover member 5 is provided so as to rotate around the axis.

具体的に述べると、拡径した締付環体３は、筒状カバー部材５の内周面６に突設された複数の小突起部７…と、抜止カバー９の内鍔部９ａと、の間に配設されると共に、締付環体３と内鍔部９ａとの間に配設された（発泡ポリエチレン等からなる）弾性スペーサ12、及び、（金属製の）バネリング13によって、弾発的に位置決めされている。即ち、軸方向位置決め機構Ｋは、小突起部７…、弾性スペーサ12、バネリング13、内鍔部９ａから構成される。 Specifically, the tightened ring 3 having an enlarged diameter includes a plurality of small protrusions 7 projecting from the inner peripheral surface 6 of the cylindrical cover member 5, an inner flange portion 9 a of the retaining cover 9, The elastic spacer 12 (made of foamed polyethylene or the like) and the spring ring 13 (made of metal) disposed between the tightening ring 3 and the inner flange portion 9a It is positioned spontaneously. That is, the axial positioning mechanism K is composed of small protrusions 7, elastic spacers 12, spring rings 13, and inner flanges 9 a.

従って、この軸方向位置決め機構Ｋにより、締付環体３が筒状カバー部材５と連れ廻って回転することができる。要するに、パイプ１を接続する前に、筒状カバー部材５を回転させて、拡径片４を見やすい位置に向けることができ、パイプ１を挿入しつつ、拡径片４が飛ぶのを目視で確認して、パイプ１が正常に接続されたことがわかる。 Therefore, the tightening ring 3 can be rotated together with the cylindrical cover member 5 by the axial positioning mechanism K. In short, before connecting the pipe 1, the cylindrical cover member 5 can be rotated to direct the enlarged diameter piece 4 to an easily viewable position, and the enlarged diameter piece 4 can be visually observed while the pipe 1 is inserted. It can be confirmed that the pipe 1 is connected normally.

小突起部７は、図１及び図２に示すように、拡径部５ａの内周面６に周方向に等間隔に、複数個（本実施の形態では５個）設けられており、締付環体３から離脱した拡径片４が筒状カバー部材５と連れ廻って回転するように構成されている。即ち、離脱した拡径片４は、筒状カバー部材５の内周面６と、継手本体２の外周面と、隣り合う２つの小突起部７，７と、縮径している締付環体３と、締め付けられているパイプ１と、から形成される所定の共連れ用空間14に、常時、配置される。 As shown in FIGS. 1 and 2, a plurality of small protrusions 7 (five in this embodiment) are provided on the inner peripheral surface 6 of the enlarged diameter portion 5a at equal intervals in the circumferential direction. The enlarged diameter piece 4 detached from the ring body 3 is configured to rotate with the cylindrical cover member 5. That is, the detached diameter-expanding piece 4 includes an inner peripheral surface 6 of the cylindrical cover member 5, an outer peripheral surface of the joint body 2, two adjacent small projections 7 and 7, and a tightening ring having a reduced diameter. It is always arranged in a predetermined shared space 14 formed by the body 3 and the pipe 1 that is tightened.

従って、この共連れ用空間14により、継手本体２が床面の直近にある場合で、離脱した拡径片４が、筒状カバー部材５の内部の下方位置にあって（即ち、下方の共連れ用空間14内にあって）、外部から目視できないときは、筒状カバー部材５を回転させることで、小突起部７，７にて、拡径片４をかきあげ、拡径片４を上方位置に持ってくることができ、外部から拡径片４を容易に目視できる。 Accordingly, when the joint body 2 is in the immediate vicinity of the floor surface, the detached diameter-expanding piece 4 is located at the lower position inside the cylindrical cover member 5 (that is, the lower common space 14). If it is not visible from the outside), the cylindrical cover member 5 is rotated to scoop up the enlarged piece 4 at the small protrusions 7 and 7 so that the enlarged piece 4 is moved upward. The diameter-enlarged piece 4 can be easily seen from the outside.

また、継手本体２が壁面のコーナー部（角部）に近接している場合で、離脱した拡径片４が、筒状カバー部材５の内部のコーナー部側にあって、外部から目視できないときは、筒状カバー部材５を回転させることで、小突起部７，７にて、拡径片４をかきあげ、拡径片４をコーナー部Ｃと反対側に持ってくることができ、外部から拡径片４を容易に目視できる。 Further, when the joint body 2 is close to the corner portion (corner portion) of the wall surface, the detached diameter-expanding piece 4 is on the corner portion side inside the cylindrical cover member 5 and cannot be visually observed from the outside. The cylindrical cover member 5 can be rotated to scrape the enlarged diameter piece 4 at the small protrusions 7 and 7 and bring the enlarged diameter piece 4 to the opposite side of the corner portion C. The expanded diameter piece 4 can be easily visually observed.

要するに、パイプ１を接続した後に、筒状カバー部材５を回転させて、離脱した拡径片４を見やすい位置に向けることができ、拡径片４が飛んでいることを目視で確認でき、パイプ１が確実に接続しているのをチェックすることができる。一方、筒状カバー部材５を回転させても、離脱した拡径片４を発見することができないときは、拡径片４が飛んでおらず、パイプ１が確実に接続していないことが判る。 In short, after connecting the pipe 1, the cylindrical cover member 5 can be rotated to turn the detached diameter-expanding piece 4 to an easily visible position, and it can be visually confirmed that the diameter-expanding piece 4 is flying. It can be checked that 1 is securely connected. On the other hand, when the detached diameter-expanding piece 4 cannot be found even when the cylindrical cover member 5 is rotated, it is understood that the diameter-expanding piece 4 is not flying and the pipe 1 is not securely connected. .

なお、拡径片４が目立つ色彩を有するようにすれば、拡径片４の発見が容易となり、パイプ１の接続のチェックを円滑に行うことができる。なお、目立つ色彩とは、拡径片４以外の他の部材の色彩と比較して、使用者にとって際立って目をひく（赤色、黄色等の）色彩をいう。 If the enlarged diameter piece 4 has a conspicuous color, discovery of the enlarged diameter piece 4 is facilitated, and the connection of the pipe 1 can be checked smoothly. Note that the conspicuous color refers to a color (red, yellow, etc.) that is conspicuously noticeable for the user as compared with the color of other members other than the diameter-expanded piece 4.

ここで、締付環体３は、縮径状態をあらわす図５及び拡径状態をあらわす図４に示すように、その両側端縁部31，31が、スリット30側へ次第に深くなる複数の谷部32…を連設状に有している。要するに、左右の谷部32，32の底部における締付環体３の左右幅寸法を、スリット30側へ小さくなるようにすることで、締付環体３の拡径のときに、締付環体３のスリット30側も十分に弾性変形させることができ、縮径状態真円状の締付環体３を真円状に拡径することができるようになっている。なお、谷部32…以外の部位における締付環体３の幅寸法は、一定に設定されている。 Here, as shown in FIG. 5 showing the diameter-reduced state and FIG. 4 showing the diameter-expanded state, the tightening ring 3 has a plurality of valleys in which both side edge portions 31 and 31 gradually deepen toward the slit 30 side. The portions 32 are continuously arranged. In short, when the diameter of the tightening ring 3 is increased, the tightening ring 3 is reduced by reducing the left and right width dimensions of the tightening ring 3 at the bottom of the left and right troughs 32 and 32 to the slit 30 side. The slit 30 side of the body 3 can also be sufficiently elastically deformed, and the diameter of the reduced diameter perfect circle-shaped fastening ring body 3 can be expanded to a perfect circle. It should be noted that the width dimension of the tightening ring 3 other than the valleys 32 is set to be constant.

即ち、拡径している締付環体３を真円状とすることで、その締付環体３内にパイプ１を挿入する際に、パイプ１が締付環体３に接触することなく、パイプ１を円滑に挿入することができる。 That is, by making the tightening ring 3 whose diameter is increased to be a perfect circle, the pipe 1 does not come into contact with the tightening ring 3 when the pipe 1 is inserted into the tightening ring 3. The pipe 1 can be inserted smoothly.

なお、締付環体３の側端縁部31，31における谷部32…の形成位置は、パイプ１を締付環体３内へ挿入していくとき（図１参照）に、側端縁部31の谷部32…以外の部位で、締付環体３が全ての小突起部７…に接触するように、設定されている。従って、パイプ１の挿入時（即ち、パイプ１が拡径片４を押圧したとき）における締付環体３の姿勢を、継手本体２の軸心と同心状となるように保持することができ、パイプ１により拡径片４を確実に離脱させることができる。 In addition, the formation position of the troughs 32 ... in the side edge portions 31, 31 of the tightening ring 3 is determined when the pipe 1 is inserted into the tightening ring 3 (see FIG. 1). The tightening ring 3 is set so as to come into contact with all the small protrusions 7 at portions other than the valleys 32 of the portion 31. Accordingly, the posture of the tightening ring 3 when the pipe 1 is inserted (that is, when the pipe 1 presses the diameter-expanding piece 4) can be held so as to be concentric with the axis of the joint body 2. The diameter-expanding piece 4 can be reliably detached by the pipe 1.

スリット30は、一方の端縁部34に形成された突部35が、他方の端縁部34に形成された凹部36に嵌合するように、凹凸嵌合状に形成されている。スリット30をこのような形状にすることにより、パイプ１に対する締付力を周方向に途切れることなく連続的に作用させることができ、パイプ１を閉ループ状に万遍なく押圧することができ、軸心方向の流体漏れを防止してシール性が向上する。 The slit 30 is formed in a concavo-convex shape so that a protrusion 35 formed on one end edge 34 is engaged with a recess 36 formed on the other end edge 34. By making the slit 30 in such a shape, the tightening force against the pipe 1 can be continuously applied without being interrupted in the circumferential direction, and the pipe 1 can be uniformly pressed in a closed loop shape. Sealing performance is improved by preventing fluid leakage in the central direction.

スリット30の両側端部の一方の間隙部30ａにて拡径片４を挟持するように組付けられ、その一方の間隙部30ａの幅寸法が、側端方向へ次第に減少するように形成されている。即ち、図５に示すように、間隙部30ａを形成する端縁部34，34の成す角度θが、1.5 °〜６°（好ましくは、２°〜４°）に設定されており、間隙部30ａにて挟持する拡径片４を、締付環体３の中央側（突部35側）へ、引き寄せることができる。 The slit 30 is assembled so that the enlarged diameter piece 4 is sandwiched by one gap portion 30a at both end portions of the slit 30, and the width dimension of the one gap portion 30a is formed so as to gradually decrease in the side end direction. Yes. That is, as shown in FIG. 5, the angle θ formed by the edge portions 34 and 34 forming the gap 30a is set to 1.5 ° to 6 ° (preferably 2 ° to 4 °). The diameter-enlarging piece 4 clamped by 30a can be drawn toward the center side (projection 35 side) of the tightening ring 3.

拡径片４は、図３および図４に示すように、平面視略山形状の規制部41と、規制部41に連設されて側面視Ｌ字状に折り曲げられた挟持部40と、挟持部40に連設されて背面視略円弧状の押圧部42と、からなり、プレス加工にて形成された平板状の中間製品を、挟持部40の部位にて側面視Ｌ字状に折り曲げることで成形される。 As shown in FIGS. 3 and 4, the diameter-enlarging piece 4 includes a restricting portion 41 having a substantially mountain shape in plan view, a holding portion 40 that is connected to the restricting portion 41 and is bent in an L shape in side view, A flat plate-like intermediate product formed by pressing and bent into a L-shape in a side view at a portion of the sandwiching portion 40. Molded with.

挟持部40の両側縁部は、図示していないが、夫々、規制部41に連設される盗み部と、盗み部に連設される頂部と、頂部に連設されるテーパ部と、テーパ部と押圧部42との間に配設される盗み部と、を有している。前記テーパ部は、挟持部40の幅寸法が、規制部41から押圧部42へ次第に縮小するように形成されている。 Although not shown in the drawings, both side edges of the clamping part 40 are a stealing part provided continuously with the restriction part 41, a top part provided continuously with the stealing part, a tapered part provided continuously with the top part, and a taper. And a stealing portion disposed between the pressing portion 42 and the pressing portion 42. The tapered portion is formed so that the width dimension of the sandwiching portion 40 gradually decreases from the restricting portion 41 to the pressing portion.

規制部41は、挟持部40の左右幅よりも、左右へ突出した顎部（耳部）41ａ，41ａを有している。押圧部42は、その先端縁部の左右両端部が、平面視、規制部41と反対方向へ、折り曲げられている折曲部46，46を有している。 The restricting portion 41 has jaw portions (ear portions) 41 a and 41 a that protrude to the left and right rather than the left and right width of the sandwiching portion 40. The pressing portion 42 has bent portions 46 and 46 in which both left and right end portions of the front end edge thereof are bent in a direction opposite to the regulating portion 41 in a plan view.

即ち、拡径片４は、挟持部40が、図４に示すように、スリット30の一方の間隙部30ａで両端縁部34，34に点又は線状に接触した状態で保持され、規制部41が、締付環体３の軸心方向外方へ突設されると共に締付環体３の側端縁部31に当接して挟持位置を規制し、押圧部42が、図３に示すように、締付環体３の内径方向へ突設されて締付環体３の内周面33に接触している。 That is, the diameter-enlarging piece 4 is held in a state in which the sandwiching portion 40 is in contact with the edge portions 34, 34 in a point or linear manner at one gap portion 30a of the slit 30, as shown in FIG. 41 protrudes outward in the axial direction of the fastening ring 3 and abuts against the side edge 31 of the fastening ring 3 to restrict the clamping position. The pressing part 42 is shown in FIG. In this manner, the fastening ring 3 is projected in the inner diameter direction and is in contact with the inner peripheral surface 33 of the fastening ring 3.

そして、拡径片４に掛かる軸心方向内方への引張力、及び、外径方向への押出力により、拡径片４の姿勢を保持することができる。要するに、作業中における締付環体３の落下等で拡径片４が容易に外れることがない。なお、挟持部40の盗み部により、締付環体３の端縁部34，34の側端縁部及び内径側縁部が、拡径片４に接触するのを防止し、拡径片４を確実に保持することができる。 And the attitude | position of the diameter expansion piece 4 can be hold | maintained by the tensile force to the axial direction inner side applied to the diameter expansion piece 4, and the pushing force to an outer diameter direction. In short, the diameter-expanded piece 4 is not easily detached due to dropping of the tightening ring 3 during the operation. In addition, the stealing portion of the clamping portion 40 prevents the side edge portions and the inner diameter side edge portions of the end edge portions 34 and 34 of the tightening ring 3 from coming into contact with the enlarged diameter piece 4. Can be securely held.

また、円弧状の押圧部42は、継手本体２の挿入筒部20に、接近した状態で沿って配設されるため、パイプ１の先端面への接触面積が大きくなり、パイプ１が拡径片４を確実に押圧することができる。 Further, since the arc-shaped pressing portion 42 is disposed along the insertion tube portion 20 of the joint main body 2 in a close state, the contact area with the tip surface of the pipe 1 is increased, and the pipe 1 is expanded in diameter. The piece 4 can be reliably pressed.

次に、本管継手Ｊによるパイプ１の接続の作用（機能）を説明する。即ち、図１に示すように、パイプ１を本管継手Ｊに挿入していくと、パイプ１の先端が、拡径片４の押圧部42の折曲部46に接触して、拡径片４を押圧し、拡径片４が、規制部41が締付環体３の側端縁部31に接触する（引っ掛かる）部分を中心に揺動（回動）しながら、挟持部40が、締付環体３から抜け出るように移動する。 Next, the operation (function) of connecting the pipe 1 by the main pipe joint J will be described. That is, as shown in FIG. 1, when the pipe 1 is inserted into the main pipe joint J, the tip of the pipe 1 comes into contact with the bent portion 46 of the pressing portion 42 of the enlarged diameter piece 4, and the enlarged diameter piece. 4, while the diameter-enlarging piece 4 swings (rotates) around a portion where the restricting portion 41 contacts (hooks) the side edge 31 of the tightening ring 3, It moves so as to come out of the fastening ring 3.

即ち、テコの原理にて、パイプ１の小さな押圧力で、締付環体３に強力な締付力で締め付けられている拡径片４を、容易に揺動させることができる。また、押圧部42の内径方向端部に、挿入されるパイプ１側へ折り曲げられている折曲部46を設けているため、拡径片４が回転し始めるまでの初動に必要な力を一番遠い部分で働かせることができる。 In other words, the enlarged diameter piece 4 fastened to the fastening ring 3 with a strong fastening force can be easily swung with a small pressing force of the pipe 1 based on the lever principle. Further, since the bent portion 46 bent toward the inserted pipe 1 side is provided at the inner diameter direction end portion of the pressing portion 42, the force required for the initial movement until the diameter-expanding piece 4 starts to rotate is reduced. Can work in the farthest part.

そして、パイプ１をさらに正常挿入位置まで押し込むと、拡径片４が締付環体３から離脱し、図２に示すように、パイプ１を締付環体３にて締め付けて、パイプ１を継手本体２に接続することができる。即ち、パイプ１が正常挿入位置まで挿入された状態では、締付環体３の締め付けによってシール材21の直上のパイプ１の壁面が挿入筒部20側に全周にわたって押圧され、パイプ内壁面にシール材21が水密に密着するとともに、シール材21が周溝22の底部に圧接され、水圧テスト時に貫通孔22ａを水密にシールする。したがって、水圧テスト時に貫通孔22ａを介して外部に水が漏れ出すことが決してない。 Then, when the pipe 1 is further pushed to the normal insertion position, the diameter-expanding piece 4 is detached from the tightening ring 3, and the pipe 1 is tightened with the tightening ring 3 as shown in FIG. It can be connected to the joint body 2. That is, in the state where the pipe 1 is inserted to the normal insertion position, the wall surface of the pipe 1 immediately above the sealing material 21 is pressed to the insertion tube portion 20 side by the tightening of the tightening ring 3, and is applied to the inner wall surface of the pipe. The sealing material 21 is in close contact with the water tight, and the sealing material 21 is pressed against the bottom of the circumferential groove 22 to seal the through hole 22a in a water tight manner during a water pressure test. Therefore, water never leaks outside through the through hole 22a during the water pressure test.

一方、本管継手Ｊは、図６に示すように、パイプ１が、正常挿入位置まで挿入されていない状態のとき、即ち、拡径片４が締付環体３を拡径した状態であるが、従来であれば、シール材21の働きによって、従来の管継手では水圧テストをクリアできるような挿入不足の状態で接続されているような場合においても、水圧テストを行うと、奥側の周溝22に貫通孔22aが穿設されているので、水圧によって貫通孔22aを介して内部の水が挿入筒部20の外側に漏れ出て挿入不足を容易に検知できる。
さらに、２つの貫通孔22aが管軸を挟んで対称位置に設けられているので、パイプ１の管端が斜め切り状態で、パイプ1の先端の突出した部分が一方の貫通孔22aの直上でシール材21を押えてしまった場合でも、他方の貫通孔22aがシールされていない。したがって、より確実に挿入不足を検知できる。 On the other hand, as shown in FIG. 6, the main pipe joint J is in a state where the pipe 1 is not inserted to the normal insertion position, that is, a state where the diameter-expanding piece 4 has expanded the diameter of the tightening ring 3. However, in the conventional case, when the water pressure test is performed even if the conventional pipe joint is connected in a state of insufficient insertion so that the water pressure test can be cleared by the function of the sealing material 21, Since the through hole 22a is formed in the circumferential groove 22, the water inside leaks out to the outside of the insertion cylinder part 20 through the through hole 22a due to water pressure, so that it is possible to easily detect insufficient insertion.
Furthermore, since the two through holes 22a are provided at symmetrical positions across the tube axis, the pipe end of the pipe 1 is obliquely cut and the protruding portion of the tip of the pipe 1 is sealed immediately above one of the through holes 22a. Even when the material 21 is pressed, the other through hole 22a is not sealed. Therefore, it is possible to more reliably detect insufficient insertion.

図７は、本発明に係る管継手の第２の実施の形態であってパイプの未接続状態の縦断面図を示し、図８は、パイプの正常接続状態の縦断面図を示している。
図７及び図８に示すように、本管継手J1は、以下に説明する構成以外は、上記管継手Jと同様の構造をしている。したがって、図７及び図８において、管継手Jと同様の部材については、同じ符号を付している。 FIG. 7 is a vertical cross-sectional view of a pipe joint according to a second embodiment of the present invention in a non-connected state of the pipe, and FIG. 8 is a vertical cross-sectional view of the pipe in a normally connected state.
As shown in FIGS. 7 and 8, the main pipe joint J1 has the same structure as the pipe joint J except for the configuration described below. Therefore, in FIG.7 and FIG.8, about the member similar to the pipe joint J, the same code | symbol is attached | subjected.

すなわち、本管継手J1は、挿入筒部20に３条の周溝22,22,25が設けられ、挿入筒部20の入口側２つの周溝22,22には、パイプ用シール材21が装着され、挿入筒部20の奥側（基端部側）の周溝25には、挿入確認用シール材26が装着されている。
また、周溝25の底には、挿入筒部20の内外を連通する貫通孔25ａが穿設されている。
そして、挿入筒部20の入口側には、筒状アダプタ（「挿入ガイド」とも称される）Pがセットされている。 That is, in the main pipe joint J1, three circumferential grooves 22, 22, and 25 are provided in the insertion cylinder portion 20, and the pipe sealing material 21 is provided in the two circumferential grooves 22, 22 on the inlet side of the insertion cylinder portion 20. The insertion confirmation seal material 26 is attached to the circumferential groove 25 on the back side (base end side) of the insertion tube portion 20.
Further, a through hole 25 a that communicates the inside and the outside of the insertion tube portion 20 is formed in the bottom of the circumferential groove 25.
A cylindrical adapter (also referred to as “insertion guide”) P is set on the inlet side of the insertion cylinder portion 20.

筒状アダプタＰは、パイプ１の内径より少し小径の外径を有する筒部P1と、この筒部P1の一端に設けられ、その外径がパイプ１と略同じであるフランジP2とを備える樹脂成形品であって、フランジP2側を挿入筒部20の奥側に向けて筒部P1が挿入筒部20に外嵌され、挿入筒部20の入口側のパイプ用シール材21が筒部P1の内面に軽く圧接することによって継手本体２に保持されている。
また、筒部P1は、その長さが、後述するように、パイプ１が正常挿入位置まで挿入された状態で。筒部P1の後端が中央のシール材21より奥側に位置するような長さになっている。
なお、筒状アダプタＰのフランジP2の外周縁および内周縁は面取りされていることが好ましい。 The cylindrical adapter P includes a cylindrical portion P1 having an outer diameter slightly smaller than the inner diameter of the pipe 1, and a flange P2 provided at one end of the cylindrical portion P1 and having an outer diameter that is substantially the same as that of the pipe 1. This is a molded product, with the flange P2 facing the back side of the insertion cylinder part 20, the cylinder part P1 is fitted on the insertion cylinder part 20, and the pipe sealing material 21 on the inlet side of the insertion cylinder part 20 is the cylinder part P1. It is held by the joint body 2 by lightly pressing the inner surface of the joint body 2.
In addition, the length of the cylindrical portion P1 is such that the pipe 1 is inserted to the normal insertion position as will be described later. The length is such that the rear end of the cylindrical portion P1 is located on the far side from the central sealing material 21.
The outer peripheral edge and the inner peripheral edge of the flange P2 of the cylindrical adapter P are preferably chamfered.

次に、本管継手J1によるパイプ１の接続の作用（機能）を説明する。本管継手J1は、上記のように、筒状アダプタＰを備えているので、管継手J1にパイプ１を挿入していくと、まず、パイプ１の管端部が筒部P1に外嵌される。そして、パイプ１の管端面がフランジP2に当たると、パイプ１の押し込みに伴って、筒状アダプタＰも挿入筒部20の奥側に向かって移動する。
そして、パイプ１が正常挿入位置まで挿入されると、筒状アダプタＰの筒部P1の内周面で挿入確認用シール材26を周溝25の底に押圧し、貫通孔25aを挿入確認用シール材26の一部によって水密に塞ぐとともに、上記管継手Ｊと同様にして拡径片４が締付環体３から離脱し、図８に示すように、パイプ１を締付環体３にて締め付けて、同時に締付環体３の締め付けによってパイプ1がシール材21直上で締め付けられて、パイプ１の抜けが防止されるとともに、シール材21によってパイプ１と挿入筒部20との間が水密にシールされる。 Next, the operation (function) of connecting the pipe 1 by the main pipe joint J1 will be described. Since the main pipe joint J1 includes the cylindrical adapter P as described above, when the pipe 1 is inserted into the pipe joint J1, the pipe end portion of the pipe 1 is first fitted onto the pipe portion P1. The When the pipe end surface of the pipe 1 hits the flange P2, the cylindrical adapter P moves toward the back side of the insertion cylinder portion 20 as the pipe 1 is pushed.
When the pipe 1 is inserted to the normal insertion position, the insertion confirmation sealing material 26 is pressed against the bottom of the circumferential groove 25 on the inner peripheral surface of the cylindrical portion P1 of the cylindrical adapter P, and the through hole 25a is inserted. While being sealed watertight by a part of the sealing material 26, the diameter-expanding piece 4 is detached from the tightening ring 3 in the same manner as the pipe joint J, and the pipe 1 is attached to the tightening ring 3 as shown in FIG. At the same time, by tightening the tightening ring 3, the pipe 1 is tightened immediately above the sealing material 21 to prevent the pipe 1 from coming off, and the sealing material 21 provides a space between the pipe 1 and the insertion tube portion 20. Sealed watertight.

すなわち、正常挿入状態では、図８に示すように、筒状アダプタＰの筒部P1が周溝25の直上に配置され、筒部P1の内周面によって挿入確認用シール材26が周溝25の底側に押圧され、貫通孔25aが水密にシールされているので、水圧テストを行なっても、貫通孔25aを通って水漏れすることがない。
一方、パイプ１の挿入が不十分な場合、筒部P1の内周面によって挿入確認用シール材26が周溝25の底側に押圧されないため、水圧テストを行なうと、貫通孔25aを介して外部に水漏れが生じる。
したがって、従来であれば、水圧テスト時に発見できなかった接続不良を水圧テストで確実に見つけることができる。
また、筒状アダプタＰを備えているので、パイプ１の管端部分が斜め切りなどされていても、支障なく正確に接続することができる。
即ち、斜め切りされている場合、パイプ１の先端でシール材21を傷つけたりする恐れがあるが、本管継手J1の場合、パイプ１の先端面が筒状アダプタＰのフランジP2のよってカバーされるため、パイプ１の管端面がシール材21に当たって傷つけるという事故を防止できる。 That is, in the normal insertion state, as shown in FIG. 8, the cylindrical portion P1 of the cylindrical adapter P is disposed immediately above the circumferential groove 25, and the insertion confirmation sealing material 26 is inserted into the circumferential groove 25 by the inner peripheral surface of the cylindrical portion P1. Since the through-hole 25a is sealed in a water-tight manner, water does not leak through the through-hole 25a even if a water pressure test is performed.
On the other hand, when the insertion of the pipe 1 is insufficient, the insertion confirmation sealing material 26 is not pressed against the bottom side of the circumferential groove 25 by the inner peripheral surface of the cylindrical portion P1, and therefore when performing a water pressure test, the through hole 25a is used. Water leaks outside.
Therefore, it is possible to reliably find a connection failure that could not be found during the water pressure test by the water pressure test.
Moreover, since the cylindrical adapter P is provided, even if the pipe end portion of the pipe 1 is obliquely cut, it can be accurately connected without any trouble.
In other words, when it is cut obliquely, the seal material 21 may be damaged at the tip of the pipe 1, but in the case of the main pipe joint J1, the tip surface of the pipe 1 is covered by the flange P2 of the cylindrical adapter P. Therefore, it is possible to prevent an accident that the pipe end surface of the pipe 1 hits the sealing material 21 and is damaged.

図９は、本発明に係る管継手の第３の実施の形態であってパイプの未接続状態の縦断面図を示し、図１０は、パイプの正常接続状態の縦断面図を示している。
図９および図１０に示すように、本管継手J2は、以下に説明する構成以外は、上記管継手Jと同様の構造をしている。したがって、図９及び図１０において、管継手Jと同様の部材については、同じ符号を付している。 FIG. 9 is a longitudinal sectional view of a pipe joint according to a third embodiment of the present invention in a non-connected state of the pipe, and FIG. 10 is a longitudinal sectional view of a normally connected state of the pipe.
As shown in FIGS. 9 and 10, the main pipe joint J2 has the same structure as the pipe joint J except for the configuration described below. Therefore, in FIG.9 and FIG.10, about the member similar to the pipe joint J, the same code | symbol is attached | subjected.

すなわち、本管継手J2は、挿入筒部20に１条の周溝22,が設けられ、周溝22には、シール材21が装着され、周溝22の底に貫通孔22aが挿入筒部20の内外に貫通するように設けられている。 That is, in the main pipe joint J2, one circumferential groove 22 is provided in the insertion cylinder portion 20, the seal material 21 is mounted on the circumferential groove 22, and a through hole 22a is formed at the bottom of the circumferential groove 22. It is provided so as to penetrate inside and outside of 20.

また、締付環体３が、拡径片４によって拡径状態に保持されているとともに、この拡径状態の締付環体３に、規制スリーブ80の円筒部81が外嵌されている。
すなわち、規制スリーブ80は、円筒部81を有し、この円筒部81の一端に内側にリング状に張り出す鍔状部82が形成されている。 Further, the tightening ring 3 is held in an expanded state by the diameter-enlarging piece 4, and the cylindrical portion 81 of the restriction sleeve 80 is externally fitted to the tightened ring 3 in the expanded diameter state.
That is, the regulation sleeve 80 has a cylindrical portion 81, and a flange-like portion 82 projecting in a ring shape is formed on one end of the cylindrical portion 81.

鍔状部82は、その内径が挿入筒部20の外径より大きくなっているとともに、図示していないが、後述する締付環体３の移動止め用突出杆39が挿通される切欠または貫通孔が設けられている。 The flange portion 82 has an inner diameter larger than the outer diameter of the insertion tube portion 20 and is not shown in the drawing, but is not shown or penetrated through a movement preventing protrusion rod 39 of a tightening ring 3 to be described later. A hole is provided.

拡径片４は、図１１に示すように、締付環体３のスリットを形成する開口両端面37、37が、軸心方向から見て、外径方向拡大状（勾配面）に形成され、端面37、37から受ける力Ｆによって拡径片４が外径方向へ飛び動作を起こすように構成されている。 As shown in FIG. 11, the diameter-enlarging piece 4 has opening end surfaces 37 and 37 that form slits of the tightening ring 3 formed in an outer-diameter enlarged shape (gradient surface) when viewed from the axial direction. The enlarged diameter piece 4 is configured to jump in the outer diameter direction by the force F received from the end faces 37, 37.

また、締付環体３は、継手本体２に当接して軸心方向に移動するのを防止する移動止め用突出杆39を有する。
図示していないが、移動止め用突出杆39は、上記規制スリーブ80の鍔状部82に設けられた切欠または貫通孔を通って挿入筒部20の奥側で継手本体２に、移動止め用突出杆39の先端に形成された円周凹溝にＵ字形をした留め具を係止させ、この留め具の両開放端を継手本体２に設けられた嵌合孔に嵌合させることによって継手本体２に固定されている。即ち、締付環体３は、径方向（縮径方向）に移動することは可能とされつつ、軸心方向に移動することは防止されている。 Further, the tightening ring 3 has a detent protrusion 39 for detent that prevents contact with the joint body 2 and movement in the axial direction.
Although not shown in the drawings, the detent protrusion 39 for detent moves to the joint body 2 on the inner side of the insertion cylinder portion 20 through the notch or the through hole provided in the eaves-shaped portion 82 of the restriction sleeve 80. A joint is formed by engaging a U-shaped fastener in a circumferential groove formed at the tip of the protruding rod 39 and fitting both open ends of the fastener into fitting holes provided in the joint body 2. It is fixed to the main body 2. That is, the tightening ring 3 is prevented from moving in the axial direction while being able to move in the radial direction (reducing diameter direction).

次に、本管継手J2によるパイプ１の接続の作用（機能）を説明する。本管継手J2は、パイプ１を挿入していくと、パイプ１の先端が規制スリーブ80の鍔状部82に当接する。そして、さらに挿入すると、規制スリーブ80がパイプ１とともに軸心内方向へスライドする。図１０に示す、正常挿入位置までパイプ１が挿入されると、規制スリーブ80の円筒部81による拡径片４への規制が解除されて拡径片４が締付環体３の端面37、37から受ける力Ｆによって外径方向へ飛び出し、締付環体３が縮径してパイプ１を締め付けてパイプ１を介してシール材21を周溝22の底方向に押圧する。したがって、貫通孔22a及びパイプ１と挿入筒部20との間がしっかり水密にシールされるとともに、パイプ１がしっかり管継手J2に接続される。 Next, the operation (function) of connecting the pipe 1 by the main pipe joint J2 will be described. When the pipe 1 is inserted into the main pipe joint J2, the tip of the pipe 1 comes into contact with the flanged portion 82 of the restriction sleeve 80. When further inserted, the regulating sleeve 80 slides in the axial direction together with the pipe 1. When the pipe 1 is inserted to the normal insertion position shown in FIG. 10, the restriction on the diameter-expanding piece 4 by the cylindrical portion 81 of the restriction sleeve 80 is released, and the diameter-expanding piece 4 becomes the end surface 37 of the tightening ring 3. The force F received from 37 protrudes in the outer diameter direction, the tightening ring 3 is reduced in diameter, the pipe 1 is tightened, and the sealing material 21 is pressed through the pipe 1 toward the bottom of the circumferential groove 22. Therefore, the through-hole 22a and the pipe 1 and the insertion cylinder portion 20 are tightly sealed tightly and the pipe 1 is firmly connected to the pipe joint J2.

一方、図１２に示すように、パイプ１の挿入不十分で規制スリーブ80による拡径片４の規制が解除されず、締付環体３が縮径していない接続状態であれば、シール材21への周溝22の底方向への押圧が不十分であるため、この状態で水圧テストを行なうと、水圧によって貫通孔22aを介して内部の水が挿入筒部20の外側に漏れ出て挿入不足を容易に検知できる。 On the other hand, as shown in FIG. 12, if the pipe 1 is not sufficiently inserted and the restriction of the diameter-expanding piece 4 by the restriction sleeve 80 is not released and the tightening ring 3 is in a connected state where the diameter is not reduced, the sealing material Since the pressure in the bottom direction of the circumferential groove 22 to 21 is insufficient, if a water pressure test is performed in this state, the water inside leaks out of the insertion tube portion 20 through the through hole 22a due to the water pressure. Insufficient insertion can be easily detected.

なお、本発明は上記の実施の形態に限定されるものではない。例えば、上記の実施の形態では、パイプ１を拡径片４が飛ぶまで挿入すれば、締付環体３が縮径してパイプ１の抜け止めがワンタッチでなされるようになっていたが、パイプ１を挿入後、袋ナットを締めこむことによって袋ナットの内周面に設けられたテーパ面によってＣ字形した締め付けリングを縮径させて抜け止めを図るようにしたような管継手などの、ワンタッチ式でない他の形式の管継手にも採用できる。要は、管内面でシールするタイプの継手であればどんな継手であってもよい。 In addition, this invention is not limited to said embodiment. For example, in the above-described embodiment, if the pipe 1 is inserted until the diameter-expanding piece 4 flies, the fastening ring 3 is reduced in diameter so that the pipe 1 can be prevented from coming off with one touch. After inserting the pipe 1, by tightening the cap nut, a pipe joint or the like that reduces the diameter of the C-shaped tightening ring by the tapered surface provided on the inner peripheral surface of the cap nut so as to prevent it from coming off, It can also be used for other types of pipe fittings that are not one-touch type. In short, any joint that seals on the inner surface of the pipe may be used.

上記の実施の形態では、上記の実施の形態では、奥側の周溝のみに貫通孔が穿設されていたが、すべての周溝に貫通孔を設けるようにしても構わない。
また、上記の実施の形態では、筒状アダプタあるいは規制スリーブのみが設けられていたが、筒状アダプタと規制スリーブとを一体化させたものでも構わない。 In the above embodiment, in the above embodiment, the through holes are formed only in the peripheral groove on the back side. However, the through holes may be provided in all the peripheral grooves.
In the above-described embodiment, only the cylindrical adapter or the restriction sleeve is provided, but the cylindrical adapter and the restriction sleeve may be integrated.

本発明にかかる管継手の第１の実施の形態を示し、そのパイプ挿入前の状態を示す縦断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows 1st Embodiment of the pipe joint concerning this invention, and shows the state before the pipe insertion. 図１の管継手のパイプを正常挿入位置まで挿入した状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which inserted the pipe of the pipe joint of FIG. 1 to the normal insertion position. 図１の管継手の拡径片を挟圧した状態の締付環体の側面図である。FIG. 2 is a side view of a tightening ring in a state in which a diameter increasing piece of the pipe joint of FIG. 1 is clamped. 図３のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図１の管継手の拡径片の離脱状態を示す作用説明図である。It is effect | action explanatory drawing which shows the detached state of the diameter expansion piece of the pipe joint of FIG. 図１の管継手のパイプ挿入不良状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pipe insertion defect state of the pipe joint of FIG. 本発明にかかる管継手の第２の実施の形態を示し、そのパイプ挿入前の状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the pipe joint concerning this invention, and shows the state before the pipe insertion. 図７の管継手のパイプを正常挿入位置まで挿入した状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which inserted the pipe of the pipe joint of FIG. 7 to the normal insertion position. 本発明にかかる管継手の第３の実施の形態を示し、そのパイプ挿入前の状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 3rd Embodiment of the pipe joint concerning this invention, and shows the state before the pipe insertion. 図９の管継手のパイプを正常挿入位置まで挿入した状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which inserted the pipe of the pipe joint of FIG. 9 to the normal insertion position. 図９の管継手の締付環体に挟持されている拡径片の作用説明図である。FIG. 10 is an operation explanatory view of a diameter-enlarging piece that is sandwiched between fastening rings of the pipe joint of FIG. 9. 図９の管継手のパイプ挿入不良状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pipe insertion poor state of the pipe joint of FIG.

Explanation of symbols

J、J1、J2 管継手
１パイプ
２継手本体
20 挿入筒部
21 シール材
22 周溝
22a 貫通孔
25 周溝
25a 貫通孔
Ｐ筒状アダプタ
P1 筒部
P2 フランジ
80 規制スリーブ
81 円筒部
82 鍔状部 J, J1, J2 Pipe fitting 1 Pipe 2 Fitting body
20 Insertion tube
21 Sealing material
22 Circumferential groove
22a Through hole
25 circumferential groove
25a Through hole P Tubular adapter
P1 tube
P2 flange
80 Regulatory sleeve
81 Cylindrical part
82 bowl

Claims

A circumferential groove to which a ring-shaped sealing material to be inserted into an end of a pipe to be connected is mounted has an insertion cylinder portion formed on an outer peripheral surface, and the ring-shaped sealing material mounted in the circumferential groove is the pipe In the pipe joint in which the pipe is connected to the inner peripheral surface of the pipe in a state where it is pressed in a watertight manner,
The ring-shaped sealing material is made watertight by pressure from the inner peripheral surface of the pipe only when the pipe is placed at a normal insertion position, communicating with the inner wall surface of the circumferential groove, inside and outside of the insertion tube portion. A pipe joint comprising a through-hole to be press-contacted.

A circumferential groove to which a ring-shaped sealing material to be inserted into an end of a pipe to be connected is mounted has an insertion cylinder portion formed on an outer peripheral surface, and the ring-shaped sealing material mounted in the circumferential groove is the pipe In the pipe joint in which the pipe is connected to the inner peripheral surface of the pipe in a state where it is pressed in a watertight manner,
A cylindrical adapter inserted into the pipe tip having a cylindrical portion inserted inside the pipe and a flange portion extending outward from one end of the cylindrical portion and having an outer diameter larger than the inner diameter of the pipe,
Wherein the insertion tube, the ring-shaped sealing member from the back side of the circumferential groove in the insertion confirmation seal material is mounted, on the lower side of the seal member have a through hole is provided which communicates with the inside and outside of the insertion tube portion ,
This through-hole is formed only when the pipe is placed at the normal insertion position with the cylindrical adapter attached to the tip of the pipe, and the insertion confirmation sealing material is applied by pressure from the inner peripheral surface of the cylindrical adapter. A pipe joint characterized by being pressed and sealed in a watertight manner.

A tightening ring with a slit for tightening the end of the pipe with a resilient tightening force, and the slit ring so as to expand the diameter of the tightening ring against the resilient force of the tightening ring. The pipe joint according to claim 1 or 2, further comprising a diameter-expanding piece that is detachably held at the end portion and is detached when the pipe is disposed at a normal insertion position.

In order to suppress the jumping movement of the enlarged diameter piece in the outer diameter direction, the outer diameter of the enlarged diameter piece is slid inward in the axial center by abutting on the tip of the pipe that is externally fitted to the fastening ring and inserted. The pipe joint according to claim 3, further comprising a restriction sleeve that allows a jumping operation in an outer diameter direction.

The pipe joint according to claim 4, wherein the restriction sleeve and the cylindrical adapter are integrated.