JP5033508B2

JP5033508B2 - Plug-in fittings

Info

Publication number: JP5033508B2
Application number: JP2007164992A
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: JFE Pipe Fitting Mfg Co Ltd; Proterial Ltd
Priority date: 2007-06-22
Filing date: 2007-06-22
Publication date: 2012-09-26
Anticipated expiration: 2027-06-22
Also published as: JP2009002455A

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差込式管継手に関する。 The present invention relates to a plug-in type 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差込式管継手として、例えば、図１１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。）。この差込式管継手によれば、内カラー３４の先端より接続管３６が差し込まれると、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、これら差込式管継手と接続管３６との結合が保持される。この結合状態で接続管３６に引き抜き力が作用すると、押圧部材３３はコイルバネ３２の弾発力により外カラー３５のテーパ面３５a側に押し付けられると共に、そのテーパ面３５aによって押圧部材３３の直角エッジ３３ａが接続管３６を押圧することにより、接続管３６の引き抜きが阻止されるというものである。 As this type of one-touch plug-in pipe joint, for example, as shown in FIG. 11, an O-ring 31 is fitted into two circumferential grooves provided on the inner surface of the large-diameter portion of the base body (joint body) 30. A coil spring 32 and an inner collar 34 made of a synthetic resin into which a pressing member 33 having a right-angled edge 33a is fitted on the inner surface are arranged at the edge of the large diameter portion, and these are covered with a tapered outer collar (push wheel) 35. There is something like that (see Patent Document 1). According to this plug-in type pipe joint, when the connecting 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 outer collar 35. By being pressed by the taper surface 35 a and the right-angled edge 33 a on the inner surface bites into the connection pipe 36, the connection between the plug-in type pipe joint and the connection pipe 36 is maintained. When a pulling force acts on the connecting pipe 36 in this coupled state, the pressing member 33 is pressed against the tapered surface 35a side of the outer collar 35 by the elastic force of the coil spring 32, and the tapered edge 35a of the pressing member 33 is pressed by the tapered surface 35a. When the connection pipe 36 is pressed, the connection pipe 36 is prevented from being pulled out.

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

しかるに、上記従来の差込式管継手では、継手本体３０に接続管３６の端部を差込み後、該接続管３６を正常長さにまで差込みできたか否かを容易に確認することができず、差込み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に差込む前に、施工者が接続管３６の末端から所定距離を置いた所定位置にマジックインキ等でマーキングをつけ、接続管３６の端部が所定の長さだけ差込まれるとマーキングが外カラー３５の開口端面直近に位置するようにし、施工後に施工者以外の第三者（施工管理者等）もそのマーキングを確認できるようにしてある。
しかしながら、こうした場合、施工者がマーキングをつけないで施工を終え、施工後にマーキングをつけることも可能であり、このため外観上マーキングが正しい位置にあっても、正しく施工されたか疑わしい面もあった。 However, in the conventional plug-in type pipe joint described above, it is not possible to easily confirm whether or not the connection pipe 36 has been inserted to a normal length after the end of the connection pipe 36 has been inserted into the joint body 30. Insufficient insertion may cause water leakage. For this purpose, in general, before inserting the connecting pipe 36 into the joint body 30, the operator puts a mark at a predetermined position at a predetermined distance from the end of the connecting pipe 36 with magic ink or the like, and ends the end of the connecting pipe 36. Is inserted in a predetermined length so that the marking is positioned in the vicinity of the opening end face of the outer collar 35, and a third party (construction manager, etc.) other than the installer can check the marking after the construction. .
However, in such a case, it is possible for the installer to finish the construction without marking, and to place the marking after the construction. .

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、接続管の所定長さの差込み状態を施工者はもとより、第三者も人目で容易に確認でき、施工性、信頼性に優れる差込式管継手を提供することにある。 The present invention has been made in order to solve such problems, and the purpose of the present invention is to make the insertion state of the predetermined length of the connecting pipe easy not only by the installer but also by a third party. It is to provide a plug-in type pipe joint that can be confirmed and has excellent workability and reliability.

本発明の差込式管継手は、請求項１に記載のように、その発明の内容を理解しやすくするために図１〜図１０に付した符号を参照して説明すると、受口部（１２）を有する継手本体（２）の受口部（１２）に接続管１１の端部が差し込まれる差込式管継手において、継手本体（２）に確認孔（１８）が内外貫通状に設けられ、継手本体（２）内に接続管（１１）が所定の長さまで差し込まれると接続管（１１）の外周面に設けられたマーキング（２１）が確認孔（１８）から確認されるように構成しており、継手本体（２）の内部に収容され接続管（１１）の外周面に係合する抜止部材（３）と、継手本体（２）の内部に収容され接続管（１１）の外周面に密着するシールリング（５）とを備えており、シールリング（５）の内径部に、接続管（１１）の末端に外嵌可能な傷付き防止スリーブ（７）が配置され、この傷付き防止スリーブ（７）は、接続管（１１）が所定長さにまで差し込まれるに伴い該接続管（１１）の末端で継手本体（２）の内奥に向かって押し込まれてシールリング（５）から抜け出るようにしてあり、シールリング（５）は、自由状態において接続管（１１）の外径よりも小さい内径を有して弾性変形自在に形成し、傷付き防止スリーブ（７）の抜け出しに伴い拡径変形して接続管（１１）の外周面に密着するようにしてあり、傷付き防止スリーブ（７）は、外周にシールリング（５）を保持するシールリング保持筒部（７ａ）と、このシールリング保持筒部の後端側に連設され、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）の末端に外嵌可能な接続管端部受け筒部（７ｂ）とを有する形に形成されていることに特徴を有するものである。尚、本願の特許請求の範囲および明細書において、「自由状態」とは、シールリング（５）が拡径するように変形されておらず圧縮応力又は引張応力が作用していない状態を言う。
このような構成によれば、継手本体（２）への接続管（１１）の所定長さの差込み状態を確認孔（１８）からマーキング（２１）を目視することで容易に確認でき、接続管（１１）の差込み不足を未然に防止できる。また、施工者が接続管（１１）にマーキング（２１）をつけずに差込み施工した場合、施工後第三者は確認孔（１８）からマーキング（２１）を見ることができず、不正な施工を行ったことを容易に確認することができる。また、施工後に確認孔（１８）からマーキングを行なうという不正があった場合、マーキングが不自然な状態になり、正しい施工でないことが容易に判別できる。すなわち、施工者により正しくマーキングを接続管（１１）につけて差込むという手順を追って施工が行われたか否かを、第三者は確認孔（１８）へのマーキング（２１）の有無を確認することで容易に見分けることができる。 The plug-in type pipe joint according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 10 in order to facilitate understanding of the contents of the invention. 12) In the plug-in type pipe joint in which the end of the connection pipe 11 is inserted into the receiving part (12) of the joint body (2) having the 12), a confirmation hole (18) is provided in the joint body (2) so as to penetrate inside and outside. When the connecting pipe (11) is inserted into the joint body (2) to a predetermined length, the marking (21) provided on the outer peripheral surface of the connecting pipe (11) is confirmed from the confirmation hole (18). A retaining member (3) accommodated in the joint body (2) and engaged with the outer peripheral surface of the connection pipe (11); and a connection member (2) accommodated in the joint body (2). It has a seal ring (5) that adheres closely to the outer peripheral surface, and is connected to the inner diameter of the seal ring (5). A scratch-proof sleeve (7) that can be externally fitted is disposed at the end of (11), and the scratch-resistant sleeve (7) is connected to the connection tube (11) as the connection tube (11) is inserted to a predetermined length. 11) is pushed toward the inner depth of the joint body (2) at the end of 11) so as to come out of the seal ring (5). The seal ring (5) is free from the outer diameter of the connecting pipe (11) in a free state. The inner sleeve has a small inner diameter and is elastically deformable, and is deformed to increase in diameter as the damage prevention sleeve (7) is pulled out so as to be in close contact with the outer peripheral surface of the connection pipe (11). (7) is connected to the seal ring holding cylinder (7a) holding the seal ring (5) on the outer periphery and the rear end side of the seal ring holding cylinder, and the inner diameter is the outer diameter of the connecting pipe (11). The end of the connecting pipe (11) formed larger than Those having features to be formed in a form having fitted possible connection tube end receiving cylinder portion and (7b). In the claims and specification of the present application, the “free state” means a state in which the seal ring (5) is not deformed so as to expand its diameter and no compressive stress or tensile stress is applied.
According to such a configuration, the insertion state of the predetermined length of the connection pipe (11) to the joint body (2) can be easily confirmed by visually observing the marking (21) from the confirmation hole (18). Insufficient insertion of (11) can be prevented in advance. In addition, when the installer inserts the connecting pipe (11) without marking (21), the third party cannot see the marking (21) from the confirmation hole (18) after the construction, and the construction is illegal. Can be easily confirmed. In addition, when there is an injustice that marking is performed from the confirmation hole (18) after construction, the marking becomes unnatural and it can be easily determined that the construction is not correct. That is, the third party confirms the presence or absence of the marking (21) in the confirmation hole (18) as to whether or not the construction has been carried out following the procedure in which the installer correctly attaches the marking to the connecting pipe (11) and inserts it. Can be easily identified.

このような構成によると、接続管（１１）を差し込むだけのワンタッチでシール状にかつ抜止め状に接続できる。
接続管（１１）を差し込むとき該接続管（１１）の端部に外側のエッジが発生していると、該端部でシールリング（５）を傷付け、シールリング（５）によるシール機能に悪影響を及ぼすため、接続管（１１）の切断後、その切断端面に発生している外側のエッジを除去する面取り等の加工が必要であり、また外側のエッジが発生しない接続管（１１）の切断方法にはロータリカッター等が挙げられるが、このような切断方法に限定されるとの制限があった。
その点、上記のように傷付き防止スリーブ（７）を継手本体（２）の内部に収容する構成によれば、接続管（１１）を切断する際、その切断端面に多少の外側のエッジが発生しそれを除去する加工を怠っても、接続管（１１）差込み時に該接続管（１１）の端部の外側のエッジでシールリング（５）を傷付けることなく施工できる。したがって、接続管（１１）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。
接続管（１１）の差込み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）との間に傷付き防止スリーブ（７）の接続管端部受け筒部（７ｂ）が介在し、接続管（１１）がシールリング（５）と非接触状態になるので、水圧試験で傷付き防止スリーブ（７）の内周面と接続管（１１）の外周面との間の隙間から接続管（１１）の外周面に沿って受口部（１２）の方向への水漏れを検知することができ、この水漏れを検知することにより接続管（１１）の差込み不足を確認できる。 With the configuration like this, can be connected to the connecting tube (11) and a seal-like with only one touch inserting the retaining shape.
If an outer edge is generated at the end of the connection pipe (11) when the connection pipe (11) is inserted, the seal ring (5) is damaged at the end, and the sealing function by the seal ring (5) is adversely affected. Therefore, after the connection pipe (11) is cut, chamfering or the like is required to remove the outer edge generated at the cut end face, and the connection pipe (11) is cut without the outer edge. Examples of the method include a rotary cutter, but there is a limitation that the method is limited to such a cutting method.
In that respect, according to the configuration in which the scratch-preventing sleeve (7) is accommodated inside the joint body (2) as described above, when the connecting pipe (11) is cut, some outer edges are formed on the cut end face. Even if the processing for generating and removing it is neglected, it can be applied without damaging the seal ring (5) at the outer edge of the end of the connecting pipe (11) when the connecting pipe (11) is inserted. Therefore, there is no restriction on the method of cutting the connecting pipe (11), and the degree of freedom of the cutting work can be obtained.
When the insertion length of the connecting pipe (11) is insufficient, the connecting pipe end receiving tube of the scratch preventing sleeve (7) between the connecting pipe (11) and the seal ring (5) as shown in FIG. Since the connecting portion (7b) is interposed and the connecting pipe (11) is not in contact with the seal ring (5), the inner peripheral surface of the scratch-preventing sleeve (7) and the outer peripheral surface of the connecting pipe (11) in the water pressure test. Water leakage in the direction of the receiving port (12) can be detected along the outer peripheral surface of the connection pipe (11) from the gap between and the connection pipe (11) by detecting this water leakage. Check for insufficient insertion.

請求項１記載の差込式管継手は、請求項２に記載のように、確認孔（１８）は継手本体（２）内のシールリング（５）より受口部（１２）の開口端側に偏倚した箇所に設けるという構成を採用することができる。このような構成によると、接続管（１１）の内部と確認孔（１８）との連通状態がシールリング（５）により遮断されるため、確認孔（１８）から水が漏洩するのを防止したり、確認孔（１８）から接続管（１１）内へ雨水が浸入するのを防止したりするために確認孔（１８）を敢えて密封シールする必要がなくなる。 Bayonet type pipe joint according to claim 1, as claimed in claim 2, confirmation holes (18) open end of the socket portion of the seal ring in the joint body (2) (5) (12) It is possible to adopt a configuration in which it is provided at a location that is biased. According to such a configuration, since the communication state between the inside of the connecting pipe (11) and the confirmation hole (18) is blocked by the seal ring (5), it is possible to prevent water from leaking from the confirmation hole (18). It is not necessary to seal the confirmation hole (18) in order to prevent rainwater from entering the connection pipe (11) from the confirmation hole (18).

請求項２記載の差込式管継手は、請求項３に記載のように、シールリング保持筒部（７ａ）の外周に、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）を形成することができる。これによれば、接続管（１１）を差し込む前、すなわち在庫、保管時にシールリング（５）には内部応力が発生せず、シールリング（５）は接続管（１１）が差し込ま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。 Bayonet type pipe coupling according to claim 2, as claimed in claim 3, the outer periphery, the concave groove writing inner diameter portion fits in the free state the seal ring (5) of the seal ring holding tubular portion (7a) (24) can be formed. According to this, before inserting the connecting pipe (11), that is, during inventory and storage, no internal stress is generated in the seal ring (5), and the seal ring (5) is inserted when the connecting pipe (11) is inserted. Since the diameter is elastically expanded for the first time and is closely adhered to the outer periphery of the connecting pipe (11), an appropriate compression allowance is maintained over a long period of time, and a predetermined service life can be guaranteed.

請求項１ないし３のいずれか１項に記載の差込式管継手は、請求項４に記載のように、継手本体（２）内のシールリング（５）と抜止部材（３）との間に、抜止部材（３）を受口部（１２）の内周に向かって押圧付勢する弾性部材（４）を収容配置し、受口部（１２）の内周に、抜止部材（３）の当接により該抜止部材（３）に径方向内方への移動作用を加えるテーパ面（１３）を受口部（１２）外方に向かって窄まり状に形成することができる。
このような構成によれば、接続管（１１）が完全に差し込まれると、抜止部材（３）は弾性部材（４）により受口部（１２）のテーパ面（１３）に押し付けられると共に、そのテーパ面（１３）によって抜止部材（３）が縮径して接続管（１１）の外周面に係合されることにより、接続管（１１）の確実な抜止め状態が得られる。
また、接続管（１１）の差込み後、接続管（１１）に引き抜き力が加えられると、接続管（１１）と同行する抜止部材（３）が受口部（１２）のテーパ面（１３）と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、接続管（１１）の外周面への係合力が増す。これにより接続管（１１）の抜け出しが確実に阻止される。 The plug-in type pipe joint according to any one of claims 1 to 3 , as described in claim 4 , is provided between the seal ring (5) in the joint body (2) and the retaining member (3). The elastic member (4) that presses and urges the retaining member (3) toward the inner periphery of the receiving portion (12) is accommodated and disposed, and the retaining member (3) is disposed on the inner periphery of the receiving portion (12). The taper surface (13) for applying a radially inward moving action to the retaining member (3) by the contact of the contact portion (3) can be formed in a narrowed shape toward the outside of the receiving portion (12).
According to such a configuration, when the connecting pipe (11) is completely inserted, the retaining member (3) is pressed against the tapered surface (13) of the receiving port (12) by the elastic member (4), and The diameter of the retaining member (3) is reduced by the tapered surface (13) and engaged with the outer peripheral surface of the connecting pipe (11), so that a reliable retaining state of the connecting pipe (11) is obtained.
Further, when a pulling force is applied to the connecting pipe (11) after the connecting pipe (11) is inserted, the retaining member (3) that accompanies the connecting pipe (11) becomes the tapered surface (13) of the receiving portion (12). , The retaining member (3) moves radially inward, and the engaging force on the outer peripheral surface of the connecting pipe (11) increases. This reliably prevents the connecting pipe (11) from coming out.

本発明の差込式管継手によれば、接続管の所定長さの差込み状態を確認孔から施工者はもとより第三者も人目で容易に確認でき、施工性、信頼性に優れる。 According to the plug-in type pipe joint of the present invention, the insertion state of the predetermined length of the connecting pipe can be easily confirmed from the confirmation hole as well as the third party by the human eye, and the workability and reliability are excellent.

図１は本発明の一実施例を示す差込式管継手の斜視図、図２は接続管の差込み完了後の状態を示す同差込式管継手の半欠截断面図、図３は接続管を差し込む前の状態を示す同差込式管継手の半欠截断面図、図４は接続管の差込み途中の状態を示す同差込式管継手の欠截断面図、図５は接続管を更なる差込み途中の状態を示す同差込式管継手の半欠截断面図、図６は接続管の端部を示す側面図、図７は同差込式管継手の傷付き防止スリーブの斜視図、図８は同差込式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 plug-in type pipe joint showing an embodiment of the present invention, FIG. 2 is a half cutaway cross-sectional view of the plug-in type pipe joint showing a state after the connection pipe is completely inserted, and FIG. FIG. 4 is a cross-sectional view of the plug-in pipe joint showing a state before the pipe is inserted, FIG. 4 is a cross-sectional view of the plug-in pipe joint showing a state during the insertion of the connection pipe, and FIG. FIG. 6 is a side view showing the end of the connecting pipe, and FIG. 7 is a view of the damage prevention sleeve of the plug-in pipe joint. FIG. 8 is a plan view of the collar of the plug-in fitting, 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、差込式管継手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、シールリング５と、傷付き防止スリーブ７等を備えている。 As shown in FIGS. 1 to 3, the plug-in type 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, and an elastic member. 4, a seal ring 5, a scratch prevention sleeve 7, and the like.

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。そして、図３のように、継手本体２は、軸方向中央付近に第１段部８を設け、この第１段部８をはさんで一側に大径部９を、他側に小径の流路１０を形成し、大径部９の開口端部、すなわち継手本体２の軸方向一端部に接続管１１の端部が差し込まれるれる受口部１２を形成し、他端部の外周に接続用雄ねじ６を形成している。受口部１２の開口端側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。受口部１２内の第１段部８とテーパ面１３との間の中間部内周には第１段部８より径大の第２段部１９を設けている。 Since the joint body 2 requires corrosion resistance and rigidity, it is manufactured by, for example, a precision casting method using an SCS material or a bronze material. As shown in FIG. 3, the joint body 2 is provided with a first step portion 8 near the center in the axial direction, a large diameter portion 9 on one side and a small diameter portion on the other side across the first step portion 8. The flow path 10 is formed, and the opening end portion of the large diameter portion 9, that is, the receiving end portion 12 into which the 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 6 is formed. A tapered surface 13 that is narrowed toward the outside of the receiving portion on the inner periphery of the opening end side of the receiving portion 12, and a circumferential groove 14 is formed on the outer end of the receiving portion of the tapered surface 13. Yes. A second step portion 19 having a diameter larger than that of the first step portion 8 is provided on the inner periphery of the intermediate portion between the first step portion 8 and the tapered surface 13 in the receiving portion 12.

図３のように、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。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。継手本体２の円周溝１４にはストッパーリング１６が嵌合されてその内径部でカラー１５及び抜止部材３が受口部外方へ抜け出るのを防止している。ストッパーリング１６はオーステナイト系ステンレス鋼（ＳＵＳ３０４）等で形成することができる。 As shown in FIG. 3, inside the receiving portion 12, the retaining member 3 that is inscribed in the tapered surface 13, the collar 15 that holds the retaining member 3, and the retaining member 3 together with the collar 15 toward the tapered surface 13. An elastic member 4 that presses and biases is disposed. 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). A stopper ring 16 is fitted into the circumferential groove 14 of the joint main body 2 to prevent the collar 15 and the retaining member 3 from coming out of the receiving portion at the inner diameter portion thereof. The stopper ring 16 can be formed of austenitic stainless steel (SUS304) or the like.

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の後端部はカラー１５の前端の段部１５ａに係合し、同弾性部材４の前端部はシールリング５に隣接配置する断面Ｌ形の環状のスペーサー１７に係合している。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）等で形成することができる。 The elastic member 4 is formed of a compression coil spring or the like, and the rear end portion of the elastic member 4 engages with a step portion 15 a at the front end of the collar 15, and the front end portion of the elastic member 4 is disposed adjacent to the seal ring 5. It is engaged with an annular spacer 17 having a shape. When a compression coil spring is used as the elastic member 4, this member can be formed of austenitic stainless steel (SUS304) or the like.

シールリング５は、オレフィン系ゴム製パッキン等で弾性変形自在に形成し、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。そして、図３のように、シーリング５はこれの内周からリップ５ａを径方向内方へ突設した形に形成し、自由状態においてリップ５ａの内径は接続管１１の外径より小さい寸法に形成している。このシールリング５は受口部１２内の第２段部１９に配置している。 The seal ring 5 is formed of an olefin rubber packing or the like so as to be elastically deformable. In particular, the seal ring 5 is formed of EPDM, which is a terpolymer of ethylene, propylene, and a crosslinking diene monomer excellent in chlorine resistance and heat resistance. Further, it can be formed of FKM (fluoro rubber) having excellent heat resistance and chemical resistance. As shown in FIG. 3, the sealing 5 is formed in a shape in which a lip 5a projects radially inward from the inner periphery thereof, and the inner diameter of the lip 5a is smaller than the outer diameter of the connecting pipe 11 in a free state. Forming. The seal ring 5 is disposed on the second step portion 19 in the receiving portion 12.

継手本体２の適所には確認孔１８を内外貫通状に設ける。図１、図２では確認孔１８が継手本体２内のシールリング５より受口部１２の開口端側に偏した箇所の円周上の少なくとも１箇所（図１に示す例では３箇所）に設けている。 A confirmation hole 18 is provided at an appropriate position of the joint body 2 so as to penetrate inside and outside. In FIG. 1 and FIG. 2, at least one place (three places in the example shown in FIG. 1) on the circumference where the confirmation hole 18 is biased toward the opening end side of the receiving portion 12 from the seal ring 5 in the joint body 2. Provided.

傷付き防止スリーブ７はＰＰ、ＰＥ等プラスチックや金属などで形成し、図２、図７に示すように、内径が接続管１１の内径と略同一径で、外径が継手本体２内の第１段部８と第２段部１９との間の内周面２０の内径よりも小さく形成されたシールリング保持筒部７ａと、このシールリング保持筒部７ａの後端側に一体に連設され、内径が接続管１１の外径よりも大きく形成されて接続管１１の末端に外嵌可能な薄肉の接続管端部受け筒部７ｂとを有する形に形成されている。シールリング保持筒部７ａの内周面と接続管端部受け筒部７ｂの内周面との間には、接続管１１の末端が当接する段部２３を形成している。シールリング保持筒部７ａの外周には、自由状態のシールリング５のリップ５ａが嵌まり込む断面略Ｖ形状の凹溝２４を形成している。接続管端部受け筒部７ｂの後端部７ｃは後方へ漸次拡径するラッパ状に形成し、これにより接続管１１の差込み時に該接続管１１の末端が接続管端部受け筒部７ｂの後端部７ｃに引っ掛かることなくスムーズに差し込まれるようになしている。接続管端部受け筒部７ｂにはスリットＳを円周方向に所定間隔置きに設けている。シールリング保持筒部７ａの先端部外周にはアール又は先窄まりテーパｃを付けて、継手本体２内の内周面２０に差し込みやすくしている。 The damage prevention sleeve 7 is made of plastic such as PP or PE, or metal. As shown in FIGS. 2 and 7, the inner diameter is substantially the same as the inner diameter of the connection pipe 11 and the outer diameter is the inner diameter of the joint body 2. A seal ring holding cylinder portion 7a formed smaller than the inner diameter of the inner peripheral surface 20 between the first step portion 8 and the second step portion 19, and a continuous connection with the rear end side of the seal ring holding cylinder portion 7a. The inner diameter of the connecting pipe 11 is larger than the outer diameter of the connecting pipe 11, and the connecting pipe 11 has a thin connecting pipe end receiving cylinder portion 7 b that can be fitted to the end of the connecting pipe 11. Between the inner peripheral surface of the seal ring holding cylinder part 7a and the inner peripheral surface of the connection pipe end receiving cylinder part 7b, a step part 23 with which the end of the connection pipe 11 abuts is formed. On the outer periphery of the seal ring holding cylinder portion 7a, a concave groove 24 having a substantially V-shaped cross section into which the lip 5a of the seal ring 5 in a free state is fitted is formed. The rear end portion 7c of the connecting tube end receiving tube portion 7b is formed in a trumpet shape that gradually increases in diameter rearward, so that the end of the connecting tube 11 is inserted into the connecting tube end receiving tube portion 7b when the connecting tube 11 is inserted. The rear end 7c is smoothly inserted without being caught. Slits S are provided at predetermined intervals in the circumferential direction in the connecting tube end receiving cylinder portion 7b. The outer periphery of the front end of the seal ring holding cylinder 7a is rounded or tapered, and is easily inserted into the inner peripheral surface 20 in the joint body 2.

カラー１５は、架橋ポリエチレンなどの汎用エンジニアリングプラスチックや、優れた耐熱性を有するＰＰＳ（ポリフェニレンサルファイド）などの特殊エンジニアリングプラスチックで形成し、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。各抜止部材３の内面側には複数（図示例では２個）の係合歯３ａを形成している。 The collar 15 is formed of general-purpose engineering plastics such as cross-linked polyethylene or special engineering plastics such as PPS (polyphenylene sulfide) having excellent heat resistance, and has a plurality of holding holes as shown in FIGS. 15b is provided at predetermined intervals in the circumferential direction, and the retaining member 3 is fitted in each holding hole 15b. A plurality (two in the illustrated example) of engaging teeth 3 a are formed on the inner surface side of each retaining member 3.

図６に示すように、接続管１１を差込式管継手１に差し込む前に、接続管１１の末端から所定距離Ｌを置いた所定位置にはマジックインキ等でマーキング２１（点描で図示する）をつける。マーキング２１は、継手本体２の受口部１２に接続管１１が所定長さにまで差し込まれると確認孔１８の内側位置に達して確認孔１８に露出するように位置設定してある。マーキング２１は例えば赤色や青色などの目立つ色に着色しておくことによって、確認孔１８からより一層確認し易くなる。 As shown in FIG. 6, before inserting the connecting pipe 11 into the plug-in fitting 1, markings 21 (illustrated by stippling) are made at a predetermined position at a predetermined distance L from the end of the connecting pipe 11 with magic ink or the like. Turn on. The marking 21 is positioned so as to reach the inner position of the confirmation hole 18 and to be exposed to the confirmation hole 18 when the connecting pipe 11 is inserted into the receiving portion 12 of the joint body 2 to a predetermined length. For example, the marking 21 is colored in a conspicuous color such as red or blue so that it can be more easily confirmed from the confirmation hole 18.

上記の差込式管継手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 plug-in pipe joint 1 will be described with reference to FIGS.

まず、現場施工で、接続管１１を差込式管継手１に差し込む前に、施工者は、図６のように接続管１１の末端から所定距離Ｌを置いた所定位置にマーキング２１（点描で図示する）をつける。 First, before the connection pipe 11 is inserted into the plug-in type pipe joint 1 at the site construction, the builder performs marking 21 (in stippling) at a predetermined position at a predetermined distance L from the end of the connection pipe 11 as shown in FIG. (Shown)

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

しかる後、図４に示すように、継手本体２の受口部１２に接続管１１を差込み、その端部を傷付き防止スリーブ７の接続管端部受け筒部７ｂに差し込んで接続管１１の末端を傷付き防止スリーブ７内の段部２３に当接させる。この接続管１１の差込みに伴い抜止部材３は受口部１２のテーパ面１３に沿って継手本体２の内奥方向に移動し、かつ係合歯３ａが接続管１１の外周面に係合する。この状態で接続管１１を引き抜く方向に外力が加わったとしても、受口部１２のテーパ面１３に当接する抜止部材３の係合歯３ａが接続管１１の外周面に係合しているので、接続管１１が抜け出ることはない。
また、この接続管１１の差込み時にはシールリング５と接続管１１の末端との間に傷付き防止スリーブ７が介在した状態にあり、この状態で接続管１１の末端の端面はシールリング５と非接触の状態で継手本体２の奥まで差し込まれるので、接続管１１の末端の端面に外側のエッジが生じていてもその外側のエッジでシールリング５が傷付けられることはなく、シールリング５の損傷による水漏れは生じない。 Thereafter, as shown in FIG. 4, the connecting pipe 11 is inserted into the receiving portion 12 of the joint body 2, and the end thereof is inserted into the connecting pipe end receiving cylindrical portion 7 b of the scratch preventing sleeve 7. The end is brought into contact with the stepped portion 23 in the scratch preventing sleeve 7. With the insertion of the connecting pipe 11, the retaining member 3 moves along the tapered surface 13 of the receiving portion 12 in the inner and inner directions of the joint body 2, and the engaging teeth 3 a engage with the outer peripheral surface of the connecting pipe 11. . Even if an external force is applied in the direction in which the connecting pipe 11 is pulled out in this state, the engaging teeth 3a of the retaining member 3 that contacts the tapered surface 13 of the receiving portion 12 are engaged with the outer peripheral surface of the connecting pipe 11. The connecting pipe 11 will not come out.
Further, when the connecting pipe 11 is inserted, the damage prevention sleeve 7 is interposed between the seal ring 5 and the end of the connecting pipe 11, and in this state, the end face of the end of the connecting pipe 11 is not in contact with the seal ring 5. Since the joint body 2 is inserted in the contact state, even if an outer edge is formed on the end face of the connecting pipe 11, the seal ring 5 is not damaged by the outer edge, and the seal ring 5 is damaged. No water leakage due to

接続管１１を更に深く差し込むと、図５の差込み途中過程を経て、図２に示すように継手本体２と接続管１１とのシール接続状態が得られる。すなわち、図５に示すように接続管１１が継手本体２内の途中まで差し込まれると、抜止部材３の係合歯３ａが接続管１１の外周面を滑りながら接続管１１は傷付き防止スリーブ７をシールリング５より継手本体２内奥方向へ押し込む。
更に、接続管１１は、図２に示すように、傷付き防止スリーブ７がシールリング保持筒部７ａを継手本体２内の第１段部８に当接するとともに接続管端部受け筒部７ｂをシールリング５より継手本体内奥方向に押込む。これと同時にマーキング２１が確認孔１８の内側位置の差込み完了位置まで到達する。この過程において、傷付き防止スリーブ７はシールリング５のリップ５ａを継手本体２の内奥方向に変向しながら移動しシールリング５から外れ、接続管１１の差込みが完了した図２の状態では、シールリング５のリップ５ａは接続管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抜止め状態が得られる。 When the connection pipe 11 is inserted further deeply, a seal connection state between the joint body 2 and the connection 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 scratched while the engaging teeth 3 a of the retaining member 3 slide on the outer peripheral surface of the connecting pipe 11. Is pushed inward from the seal ring 5 in the joint body 2.
Further, as shown in FIG. 2, the connection pipe 11 has an anti-scratching sleeve 7 that abuts the seal ring holding cylinder part 7 a against the first step part 8 in the joint body 2 and the connection pipe end receiving cylinder part 7 b. Push in from the seal ring 5 toward the inside of the joint body. At the same time, the marking 21 reaches the insertion completion position inside the confirmation hole 18. In this process, the scratch-preventing sleeve 7 moves while turning the lip 5a of the seal ring 5 inward and backward in the joint body 2 and is detached from the seal ring 5, and the insertion of the connecting pipe 11 is completed in the state of FIG. The lip 5a of the seal ring 5 is in close contact with the outer peripheral surface of the connection pipe 11 in a compressed manner to provide a state of hermetically sealing between the outer peripheral surface of the connection pipe 11 and the inner peripheral surface of the joint body 2, and a retaining member. A retaining state in which the three engaging teeth 3 a are engaged with the outer peripheral surface of the connecting pipe 11 is obtained.

シールリング５のリップ５ａが継手本体２の内奥方向に向いた状態で接続管１１の外周面に圧縮状に密着していると、継手本体２内を流れる水が継手本体２の内周と傷付き防止スリーブ７との間あるいは接続管１１の末端と傷付き防止スリーブ７との間からシールリング５にまで流れ込んできてもその水圧によってリップ５ａを接続管１１の外周面に押し付けるというシール圧が発生し、このためシール機能を効果的に発揮する。 When the lip 5a of the seal ring 5 is in a compression state in close contact with the outer peripheral surface of the connecting pipe 11 with the lip 5a facing the inner back direction of the joint body 2, water flowing in the joint main body 2 Even if it flows into the seal ring 5 between the damage prevention sleeve 7 or between the end of the connection pipe 11 and the damage prevention sleeve 7, the seal pressure presses the lip 5 a against the outer peripheral surface of the connection pipe 11 by the water pressure. Therefore, the sealing function is effectively exhibited.

こうした接続管１１の差込み完了状態は、確認孔１８から接続管１１のマーキング２１が見えることを確認することによって、接続管１１が所定長さの位置まで確実に差し込まれていることを確認することができる。したがって、接続管１１の差込み不足による内部水漏れの発生を未然に防止することができる。また、施工者が接続管１１にマーキング２１をつけずに差込み施工した場合、施工後、第三者は確認孔１８からマーキング２１を見ることができないことから容易に発見することができる。
確認孔１８は継手本体２内のシールリング５より受口部１２の開口端側に偏した箇所に設けていると、接続管１１の内部と確認孔１８との連通状態がシールリング５により遮断され、確認孔１８から内部の水が漏洩するのを防止したり、確認孔１８から接続管１１内へ雨水が浸入するのを防止したりするために確認孔１８を敢えて密封シールする必要がなくなる。 In such a completed insertion state of the connecting pipe 11, by confirming that the marking 21 of the connecting pipe 11 can be seen from the confirmation hole 18, it is confirmed that the connecting pipe 11 is securely inserted to a position of a predetermined length. Can do. Therefore, the occurrence of internal water leakage due to insufficient insertion of the connecting pipe 11 can be prevented. In addition, when the installer performs the insertion work without attaching the marking 21 to the connecting pipe 11, the third party cannot easily see the marking 21 from the confirmation hole 18 after the construction.
If the confirmation hole 18 is provided at a location deviated from the seal ring 5 in the joint body 2 toward the opening end of the receiving portion 12, the communication state between the inside of the connection pipe 11 and the confirmation hole 18 is blocked by the seal ring 5. Therefore, it is not necessary to seal and seal the confirmation hole 18 in order to prevent the internal water from leaking from the confirmation hole 18 or to prevent rainwater from entering the connection pipe 11 from the confirmation hole 18. .

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

接続管端部受け筒部７ｂを有する傷付き防止スリーブ７が組み込まれていると、次のような利点もある。すなわち、接続管１１の差込み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との間に傷付き防止スリーブ７の接続管端部受け筒部７ｂが介在し、接続管１１がシールリング５と非接触状態になるので、水圧試験で傷付き防止スリーブ７の内周面と接続管１１の外周面との間の隙間から接続管１１の外周面に沿って受口部１２の方向への水漏れが生じる。この水漏れを検知することにより接続管１１の差込み不足を確認できる。この場合、図７のように接続管端部受け筒部７ｂにスリットＳを円周方向に所定間隔置きに設けておくと、より大きな水漏れを発生させることができ、検知が容易になる。 When the damage prevention sleeve 7 having the connecting pipe end receiving tube portion 7b is incorporated, the following advantages are also obtained. That is, when the insertion length of the connecting pipe 11 is insufficient, the connecting pipe end receiving tube portion 7b of the scratch preventing sleeve 7 is interposed between the connecting pipe 11 and the seal ring 5 as shown in FIG. Since the connecting pipe 11 is not in contact with the seal ring 5, it is received along the outer peripheral face of the connecting pipe 11 from the gap between the inner peripheral face of the scratch-preventing sleeve 7 and the outer peripheral face of the connecting pipe 11 in the hydraulic pressure test. Water leakage in the direction of the mouth 12 occurs. By detecting this water leak, it is possible to confirm that the connecting pipe 11 is insufficiently inserted. In this case, as shown in FIG. 7, if the slits S are provided in the circumferential direction in the connecting tube end receiving tube portion 7b at predetermined intervals, a larger water leak can be generated and the detection becomes easy.

尚、接続管１１の接続後、接続管１１を差込式管継手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 order to artificially detach the connection pipe 11 from the plug-in type pipe joint 1 after the connection pipe 11 is connected, a screwdriver or the like is inserted from the receiving port 12 and the collar 15 together with the retaining member 3 inside the joint body 2. By pushing inward 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を差込む前、すなわち在庫、保管時には、傷付き防止スリーブ７のシールリング保持筒部７ａの外周に形成した凹溝２４に、自由状態のシールリング５のリップ５ａ（内径部）を嵌まり込む状態にしている。仮に、シールリング保持筒部７ａの外周にシールリング５のリップ５ａを格納する凹溝２４を設けずに嵌め込むとシールリング５のリップ５ａ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のリップ５ａ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のリップ５ａは接続管１１が差込まれたときにはじめて弾性的に拡径変形して接続管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, before inserting the connecting pipe 11, that is, at the time of inventory and storage, the groove 24 formed in the outer periphery of the seal ring holding cylinder portion 7a of the scratch-preventing sleeve 7 has the seal ring 5 in a free state. The lip 5a (inner diameter part) is fitted. If the outer periphery of the seal ring holding cylinder portion 7a is fitted without the concave groove 24 for storing the lip 5a of the seal ring 5, the lip 5a of the seal ring 5 is elastically deformed (expanded diameter). 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, when the lip 5a of the seal ring 5 in the free state is fitted in the concave groove 24 formed on the outer periphery of the seal ring holding cylinder portion 7a as shown in FIG. Since the lip 5a of the seal ring 5 is elastically enlarged and deformed only when the connecting pipe 11 is inserted, the lip 5a of the seal ring 5 is in close contact with the outer periphery of the connecting pipe 11, so that an appropriate compression allowance is maintained for a long period of time. And can guarantee a predetermined service life.

上記実施例では、シールリング５にはリップパッキンを採用しているが、リップパッキンに代えて、Ｏリングを採用することもできる。 In the above embodiment, lip packing is employed for the seal ring 5, but O-rings may be employed instead of the lip packing.

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

さらに、上記実施例では、継手本体２の一方の側に接続用雄ねじ６を形成した雄ねじアダプター差込式管継手について記述したが、本発明はこれに限られず、他の構造、例えば、左右対称のソケット形差込式管継手、エルボ型差込式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。 Furthermore, in the said Example, although the external thread adapter plug-in type pipe joint which formed the external thread 6 for connection in the one side of the coupling body 2 was described, this invention is not limited to this, Other structures, for example, left-right symmetry Of course, the present invention can also be applied to socket-type plug fittings, elbow-type plug fittings, 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差込式管継手の斜視図である。It is a perspective view of the plug-in type pipe joint of one example of the present invention. 接続管の差込み完了後の状態を示す同差込式管継手の半欠截断面図である。It is a half notched cross-sectional view of the plug-in type pipe joint showing a state after the connection pipe is completely inserted. 接続管を差込む前の状態を示す同差込式管継手の半欠截断面図である。It is a half notched cross-sectional view of the same plug-in type pipe joint showing a state before the connecting pipe is inserted. 接続管の差込み途中の状態を示す同差込式管継手の半欠截断面図である。It is a half notched cross-sectional view of the same plug-in type pipe joint showing a state during the insertion of the connecting pipe. 接続管を更なる差込み途中の状態を示す同差込式管継手の半欠截断面図である。It is a half notched cross-sectional view of the plug-in type pipe joint showing a state in the middle of further insertion of the connecting pipe. 接続管の端部を示す側面図である。It is a side view which shows the edge part of a connecting pipe. 同差込式管継手の傷付き防止スリーブの斜視図である。It is a perspective view of the damage prevention sleeve of the plug-in type pipe joint. 同差込式管継手のカラーの平面図である。It is a top view of the color of the plug-in type 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. 従来例の差込式管継手の半欠截断面図である。It is a half notched cross-sectional view of a conventional plug-in type pipe joint.

１差込式管継手
２継手本体
３抜止部材
４弾性部材
５シールリング
７傷付き防止スリーブ
７ａシールリング保持筒部
７ｂ接続管端部受け筒部
１１接続管
１２受口部
１３テーパ面
１８確認孔
２１マーキング
２４凹溝 DESCRIPTION OF SYMBOLS 1 Plug-in type pipe joint 2 Joint main body 3 Pull-out member 4 Elastic member 5 Seal ring 7 Damage prevention sleeve 7a Seal ring holding | maintenance cylinder part 7b Connection pipe end part receiving cylinder part 11 Connection pipe 12 Receiving part 13 Tapered surface 18 Confirmation hole 21 Marking 24 Groove

Claims

In a plug-in type pipe joint in which an end of a connecting pipe is inserted into the receiving part of the joint body having a receiving part, a confirmation hole is provided in the joint body so as to penetrate inside and outside, and the connecting pipe is provided in the joint body. Is configured so that the marking provided on the outer peripheral surface of the connecting pipe is confirmed from the confirmation hole when inserted to a predetermined length,
A retaining member that is housed inside the joint body and engages with the outer peripheral surface of the connection pipe, and a seal ring that is housed inside the joint body and is in close contact with the outer peripheral face of the connection pipe ,
An anti-scratching sleeve that can be externally fitted to the end of the connecting pipe is disposed on the inner diameter portion of the seal ring, and the anti-scratching sleeve is inserted into the connecting pipe to a predetermined length. It is pushed toward the inner part of the joint body at the end so as to come out of the seal ring,
The seal ring has an inner diameter smaller than the outer diameter of the connection pipe in a free state and is formed to be elastically deformable. The seal ring expands and deforms on the outer peripheral surface of the connection pipe as the scratch prevention sleeve comes out. It is in close contact,
The scratch-preventing sleeve is connected to a seal ring holding cylinder portion that holds the seal ring on an outer periphery and a rear end side of the seal ring holding cylinder portion, and has an inner diameter larger than the outer diameter of the connection pipe. The plug-in type pipe joint according to claim 1, wherein the connection pipe end fitting cylinder is formed to have a connection pipe end receiving tube portion that can be fitted onto the end of the connection pipe .

The confirmation hole is the joint the is provided the seal ring at a position which is biased to the open end side of the socket portion, claim 1 bayonet type pipe coupling according in the body.

The plug-in type pipe joint according to claim 2 , 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.

An elastic member that presses and urges the retaining member toward the inner periphery of the receiving portion is accommodated between the seal ring and the retaining member in the joint body, and the inner periphery of the receiving portion. in the form a tapered surface to apply a movement effect in the radial direction inwardly該抜stop member by abutment of the stop member to form Subomari toward the receptacle outer side, any of claims 1 to 3 The plug-in type pipe joint according to claim 1.