JP2004068978A

JP2004068978A - Protective cap of resin for piping

Info

Publication number: JP2004068978A
Application number: JP2002231600A
Authority: JP
Inventors: Akira Kubota; 久保田　晃
Original assignee: Usui Kokusai Sangyo Kaisha Ltd
Current assignee: Usui Kokusai Sangyo Kaisha Ltd
Priority date: 2002-08-08
Filing date: 2002-08-08
Publication date: 2004-03-04
Anticipated expiration: 2022-08-08
Also published as: JP4332332B2

Abstract

<P>PROBLEM TO BE SOLVED: To accurately bend a pipe with a protective cap for the piping installed omitting attachment/detachment of the protective cap, improve productivity, prevent breakage of plating or resin coating on the piping, and achieve high-reliability of gas tightness to a connected item. <P>SOLUTION: A cap main body 5 is formed to have a U-shaped cross section comprising a bottom wall 6 perpendicular to an axial direction of the piping 1 at one end, and an insertion port 7 for the piping 1 at the other end. To the bottom wall 6 having a uniform thickness, a tip part 2 of the pipe inserted from the insertion port 7 can be applied. In this applied state, the outer circumference of the cap main body 5 is held with the pipe 1 by a chuck 14 of a bender, to bend the pipe 1. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【産業上の利用分野】
本発明は、自動車や機械等への燃料や油等の流体供給用の配管の継ぎ手を保護するための配管用の樹脂製保護キャップに係るもので、保護キャップを装着した状態で配管を位置決めしたり、ベンダのチャックにて配管を保持し、配管の曲げ加工を高精度に行えるようにするものである。
【０００２】
【従来の技術】
従来、自動車の燃料管等の金属製、樹脂製の配管を接続先に接続する際は、ゴムホース等を用いていたが、近年ではクイックコネクタ等を用いた配管の接続が主流となり、より簡単で迅速な配管の接続が可能となるとともに、信頼度の高い気密性を得る事が可能となっている。そして、配管の組み付け前の、運搬時や保管時は、配管のクイックコネクタへの挿入部のメッキ被膜や樹脂被覆膜が破損して気密性を低下させないように、該挿入部の外周に塩化ビニル製の有底の保護キャップを装着していた。
【０００３】
この塩化ビニル製の保護キャップは、黒色等の不透明な製品が多く、底部に連続してツノ状の引張り片を傾斜方向に突出形成し、このツノ状の引張り片を手指又は機械にて保持して引っ張る事により、配管からの保護キャップの取り外しを可能としている。
【０００４】
そして、曲げ加工ラインにて配管の曲げ加工を行う際には、保護キャップを装着したままではツノ状の引張り片が邪魔となり、ベンダにて曲げ平面を得にくく、配管の先端部を基準としたクランプ位置や曲げ位置を正確に決定しにくいため、一旦、配管から保護キャップを外し、位置決めして配管の曲げ加工を行っていた。この曲げ加工完了後に、配管に保護キャップを再装着し、製品の保管や納入先への運搬を行っていた。
【０００５】
【発明が解決しようとする課題】
しかしながら、前記曲げ加工ラインに於いて、何千、何万もの配管に対して保護キャップの外し作業と装着作業を行うのは膨大な時間が掛かり、非効率的である。また、環状膨出部を設けた配管に保護キャップを使用した場合、黒色等の不透明な塩化ビニル製の保護キャップを介して、環状膨出部の加工済み配管であるか未加工の配管であるかが目視で発見しにくく、不良品を生じる虞があった。また、塩化ビニルは、環境に与える影響が大きい問題を生じている。また、ベンダのチャックにて、配管の挿入部を強く保持するので、配管の挿入部のメッキ被膜や特にその上層に配設した樹脂被覆膜を傷付ける可能性があり、クイックコネクタのシール部材等との気密性を悪くして、燃料漏れ等に繋がる虞もある。また、保護キャップから斜め方向に立体的に引張り片が突出しているため、嵩張りを生じて収納性が低下したり、運搬時等の刺激で保護キャップが配管から不用意に外れる虞もあった。
【０００６】
本発明は上述の如き課題を解決しようとするもので、保護キャップを装着したままで、配管をベンダのチャックに装着可能とするとともに、配管の先端部の位置を正確に特定可能とし、この先端部を基準とした曲げ位置の位置決めを高精度に行う事を可能とするものである。このように保護キャップを装着した状態で配管の正確な曲げ加工を可能とする事により、保護キャップの着脱作業の手間を省いて、生産性を高め製品の品質の向上を可能とする。また、ベンダのチャックによる配管のメッキ被膜や樹脂被覆膜の破損を防止し、クイックコネクタ等の配管の接続先との信頼度の高い気密性を得て、装置内での燃料漏れ等の不具合を良好に防止可能とする。また、保護キャップを、廉価な材料で経済的に製造するとともに、人体や環境に影響の少ない使用や処分を可能とする。
【０００７】
【課題を解決するための手段】
本発明は、上述の如き課題を解決するため、一端を配管の軸方向に垂直な底壁とし他端を配管の挿入口とする断面コ字形のキャップ本体を形成し、前記底壁を均一な肉厚とし、この底壁に挿入口から挿入した配管の先端部を突き当て可能とし、この突き当て状態で配管とともにキャップ本体の外周をベンダのチャックにより保持し、配管の曲げ加工を可能として成るものである。
【０００８】
また、キャップ本体は、底壁側の小径部と、挿入口側の大径部とから形成し、環状膨出部を設けた配管を挿入口から挿入し、該配管の先端部を前記底壁に突き当てた状態で配管の環状膨出部を大径部に配置しても良い。
【０００９】
また、キャップ本体は、内周面にて配管の外周面を挟持可能としても良い。
【００１０】
また、キャップ本体は、内周面に、配管の外周面に当接し配管を挟持可能な突条を軸方向に複数設けるか又は保持突起を複数設けても良い。
【００１１】
また、大径部は、内接円径が配管の環状膨出部の外径よりも小径となるよう内周面に複数の係止突起を設け、配管の着脱作業時には樹脂の弾性により環状膨出部が係止突起を乗り越え可能であるが、キャップ本体の装着状態では環状膨出部が突起に当接する事で抜け防止手段としても良い。
【００１２】
【作用】
本発明は、上述の如く構成したものであり、配管に保護キャップを装着すると、軸方向に垂直に設けた底壁に配管の先端部が突き当たり、配管の先端部及び外周面が保護キャップにより保護され、配管の大量の積み上げや運搬の際の刺激等による配管のメッキ被膜や樹脂被覆膜等の破損を防止可能となる。また、従来の如き、斜めに突出する引張り片を設けずに、断面コ字形の対称的な形状としているので、より整然とした積み上げや整列検査が可能となり、嵩張りを防いで収納性や運搬性が向上するとともに、保護キャップの不用意な脱落も防ぐ事ができる。
【００１３】
そして、配管の曲げ加工を行うには、ベンダのチャックにて、保護キャップの外周を保持して配管を固定する。尚、従来技術では、保護キャップの底壁が傾斜しているため、曲げ平面を得る事ができず、配管から保護キャップを一旦外して曲げ加工を行った後、再び保護キャップを装着する必要があり、配管ごとに保護キャップの着脱を行っていたので、非効率的なものとなっていた。
【００１４】
しかし、本発明では、配管の先端を突き当てる底壁を、配管の軸方向に垂直に形成するとともに均一な肉厚で形成しているので、チャックのストッパーに底壁を突き当てて、配管の先端部を基準に曲げ平面の位置の確定を高精度に行う事ができる。また、運搬時の振動等で配管の先端部が底壁に当接していない場合でも、チャックのストッパーに底壁を当接した状態で配管を底壁方向に押し込む事により、先端部を確実に底壁に当接させる事ができる。
【００１５】
従って、保護キャップを装着したままで、配管の先端部の位置を基準として高精度に曲げ加工位置を決定して、配管の曲げ加工を行う事ができ、保護キャップの着脱作業を省いて曲げ加工ラインに於ける生産性を大きく向上させる事が可能となるとともに、各配管ごとに曲げ位置の揃った高品質な製品を得る事ができる。また、保護キャップを介して配管を保持するので、チャックにより配管の挿入部のメッキ被膜や樹脂被覆膜等が破損する事がなく、クイックコネクタのシール部材等と配管との気密性が保たれ、燃料漏れ等の不具合を防止可能となる。また、配管の運搬時、曲げ加工時、曲げ加工後の運搬時は勿論、クイックコネクタ等による配管の接続作業を行う際まで、配管の挿入部から保護キャップを外す必要がなく、終始保護キャップで配管の挿入部を保護する事ができ、挿入部のメッキ被膜や樹脂被覆膜等の優れた破損防止効果による、配管の高い漏れ防止効果が得られる。
【００１６】
また、外周に環状膨出部を設けた配管の場合、キャップ本体は、底壁側の小径部と、挿入口側の大径部とから形成し、この大径部に環状膨出部を配置して衝撃から環状膨出部を保護するようにしても良い。そして、この環状膨出部を設けた配管を挿入口から挿入し、該配管の先端部を前記底壁に突き当てた状態で配管の環状膨出部が大径部に位置するような寸法の取り合わせとし、配管の先端部が底壁に確実に突き当たるようにする。また、この大径部と小径部とを設けたキャップ本体は、環状膨出部を設けず、外周面が平滑な配管用に使用しても勿論良く、大径部と配管の外周面との隙間に手指の爪や工具を引っ掛けて、キャップ本体を配管から容易に外す手段とする事もできる。
【００１７】
また、キャップ本体は、内周面にて配管の外周面を挟持可能とすれば、保護キャップの装着中に、多少の衝撃を受けても、内周面が確実に配管を挟持して、保護キャップが配管から不用意に脱落しにくいものとなる。但し、キャップ本体を小径部と大径部で構成した場合は、小径部の内周面にて、配管の環状膨出部よりも先端側を挟持可能とする。
【００１８】
また、キャップ本体は、内周面に、配管の外周面に当接し配管を挟持可能な突条を軸方向に複数設けるか又は保持突起を複数設ければ、小径部の内周面全体で配管を挟持した場合と同様に、配管からの保護キャップの不用意な脱落を良好に防止できる。更に、小径部の内周面全面で配管を挟持した場合に比べて、配管外周面に作用する面圧が部分的に高くなるが、小径部の内周面と配管の外周面との隙間から空気が出入りするので、保護キャップの着脱作業をより円滑に行う事ができる。また、キャップ本体を小径部と大径部とで構成した場合は、小径部の内周面に前記突条又は保持突起を設ける。
【００１９】
また、環状膨出部を設けた配管用の保護キャップの場合は、環状膨出部を配置する大径部は、内接円径が配管の環状膨出部の外径よりも小径となるよう内周面に複数の係止突起を設けて形成しても良い。すると、配管の着脱作業時にはキャップ本体を形成する樹脂の弾性により環状膨出部が係止突起を乗り越え可能であるが、キャップ本体の装着状態では環状膨出部が係止突起に当接する事で抜け防止手段とする事ができる。この抜け防止手段により、保護キャップの装着状態で多少の抜け力が作用しても、保護キャップの不用意な脱落を良好に防止するが、人手や機械による任意の保護キャップの着脱は、円滑に行う事ができるものとなる。
【００２０】
また、配管の先端部が確実に底壁に突き当たり、底壁の肉厚を基準に先端部の位置が特定できるので、キャップ本体を従来の如く黒色等の不透明なものとしても良い。しかし、キャップ本体を透明又は半透明な樹脂で形成すれば、先端部の位置を確実にキャップ本体の外面から確実に判別可能となり、曲げ加工の作業効率をより向上させる事ができる。特に、環状膨出部を設けた配管の場合は、キャップ本体を装着したままで、環状膨出部の有無を明確に確認でき、未加工品の選別作業を効率的に行う事ができ、不良品の発生等も抑える事もできる。
【００２１】
また、透明又は不透明な樹脂材料として、ポリエチレン、ポリアミド、ポリプロピレン、ポリアセタール等を使用するのが好ましく、材料費が廉価で容易な成形が可能となり、キャップ本体を低コストで形成する事ができる。また、粘着性が高く柔軟な従来の塩化ビニル製保護キャップに比べて、上記樹脂で形成したキャップ本体は、過度の折れ曲がりや伸縮の無い適度な硬度と自己潤滑性を有するものとなり、キャップ本体の着脱作業をより円滑に行う事ができる。また、塩化ビニルでは、環境に与える影響が大きいが、ポリエチレン、ポリアミド、ポリプロピレン、ポリアセタール等では、安全な使用や処分が可能となるし、リサイクル等も容易に行う事が可能となる。
【００２２】
【実施例】
以下、本発明の実施例を図面に於て詳細に説明すれば、図１は本発明の第１実施例の保護キャップの断面図で、小径部の内周面で配管を挟持可能とし、大径部に抜け防止手段として、３個の係止突起を設けたものであり、図２は、図１の挿入口側の平面図である。また、図３に示す第２実施例は、小径部の内周面に設けた突条にて配管を挟持可能とし、大径部に６個の係止突起を設けたものであり、図４は、図３の挿入口側の平面図である。また、図５に示す第３実施例は、小径部の内周面に設けた保持突起にて配管を保持可能としたものである。また、図６は、保護キャップの装着状態で配管を保持固定して、曲げ加工を行っている概念図を示したものである。
【００２３】
まず、上記各実施例に於いて、（１）は配管で、管径３０ｍｍ以下の比較的細径の一重巻鋼管、二重巻鋼管、アルミ管等の金属又は樹脂で形成され、先端部（２）から一定間隔を介した外周面に、スプール加工により環状膨出部（３）を突設し、先端部（２）から環状膨出部（３）を含む部位を、クイックコネクタ等の接続手段への継ぎ手としての挿入部（４）としている。
【００２４】
この配管（１）の先端部（２）及び環状膨出部（３）を含む挿入部（４）に装着し、衝撃から保護するための保護キャップは、内部の配管（１）を容易に目視可能な半透明な低密度ポリエチレンでキャップ本体（５）を形成し、このキャップ本体（５）の一端を配管（１）の軸方向に垂直な底壁（６）とし、他端を配管（１）の挿入口（７）とした断面コ字形の円筒状に形成している。更に、この円筒部分は、底壁（６）側を小径部（８）とし、配管（１）の環状膨出部（３）よりも先端部（２）側を配置可能とし、挿入口（７）側を大径部（１０）とし、配管（１）の環状膨出部（３）を配置可能としている。また、上記ではキャップ本体（５）を、ポリエチレンの一種である低密度ポリエチレンで形成しているが、ポリアミド、ポリプロピレン、ポリアセタール等で形成しても良い。
【００２５】
また、図１にａで示す小径部（８）の形成長さは、配管（１）の先端部（２）から環状膨出部（３）までの形成長さｂよりも短く形成し、図１、図３に示す如く、キャップ本体（５）に配管（１）を挿入した際に、配管（１）の先端部（２）が底壁（６）に確実に突き当たるような寸法で形成する。また、底壁（６）は１ｍｍ程度の均一な肉厚で形成し、底壁（６）に突き当てた配管（１）の、先端部（２）の位置を正確に特定可能としている。
【００２６】
そして、図１、図２に示す第１実施例では、小径部（８）の内径を配管（１）の素管の外径と略同一径で形成し、該小径部（８）の内周面にて配管（１）の外周面を挟持可能とし、配管（１）へのキャップ本体（５）の装着性を得るとともに、配管（１）の不用意な抜けを防止している。
【００２７】
また、大径部（１０）は、内径を環状膨出部（３）の外径よりも内径を多少大径に形成し、その内周面の挿入口（７）側に、環状膨出部（３）を当接可能な３個の係止突起（１１）を円周状に内設している。これら３個の係止突起（１１）は、内接円径が環状膨出部（３）の外径よりも僅かに小径となるような寸法で突設し、環状膨出部（３）を係止突起（１１）に当接する事で、配管（１）の抜け防止手段（１２）としている。また、係止突起（１１）を挿入口（７）側に設ける事により、配管（１）の先端部（２）を底壁（６）に突き当てた状態で、環状膨出部（３）が係止突起（１１）に当接する寸法で形成した配管（１）に、本発明の保護キャップを使用する事ができるし、図１に示す如く、先端部（２）から環状膨出部（３）までの形成長さが比較的短く、先端部（２）を底壁（６）に突き当てた状態で、環状膨出部（３）が係止突起（１１）に当接しない寸法で形成した配管（１）にも使用する事ができ、汎用性に優れた製品とする事ができる。
【００２８】
上記抜け防止手段（１２）により、キャップ本体（５）の配管（１）への装着状態に於いて、運搬や曲げ加工装置への設置の際等に、多少の抜け力が作用しても、環状膨出部（３）の背面が係止突起（１１）に当接して抜けが防止されるが、キャップ本体（５）への配管（１）の着脱作業時には、ポリエチレン、ポリアミド、ポリプロピレン、ポリアセタール等の樹脂材の弾性により環状膨出部（３）が係止突起（１１）を乗り越え可能で、円滑な着脱作業が可能となっている。
【００２９】
上記第１実施例に対して、図３、図４に示す第２実施例では、小径部（８）の内径を配管（１）の素管の外径よりも大径に形成し、その内周面に、配管（１）の外周面に当接し配管（１）を挟持可能な突条（１３）を軸方向に４本、内方に突設している。この４本の突条（１３）で配管（１）の外周面を挟持可能とする事により、保持安定性や抜け防止の効果が得られるし、第１実施例の小径部（８）の内周面全体で配管（１）を挟持する場合に比べて部分的に面圧は高くなるが、小径部（８）の内周面と配管（１）の外周面との隙間から空気が出入りするので、保護キャップの着脱作業をより円滑に行う事ができる。
【００３０】
また、第２実施例では、先端部（２）から環状膨出部（３）までの形成長さの異なる複数種の配管（１）に対して、抜け防止が可能なように、抜け防止手段（１２）として、図３、図４に示す如く、大径部（１０）の内周面に６個の係止突起（１１）を、軸方向に一定間隔で互い違いに突設している。このような係止突起（１１）の配置とする事により、配管（１）の任意の位置に形成された環状膨出部（３）の背面が、図３に示す如く、前記６個の係止突起（１１）の何れかに当接し、キャップ本体（５）からの配管（１）の不用意な抜けを良好に防止可能となる。
【００３１】
また、上記第２実施例では、小径部（８）の内周面に突条（１３）を設けているが、図５に示す第３実施例の如く、小径部（８）の内周面に、軸方向に一定間隔で複数の保持突起（１８）を設け、この軸方向に配置した複数の保持突起（１８）を、円周方向に複数セット一定間隔に配置する事で、各保持突起（１８）にて配管（１）の外周面を保持固定可能としている。また、配管（１）を保持可能であれば、第３実施例の如く軸方向及び円周方向に一定間隔で保持突起（１８）を設けずに、ランダムに設けても良いし、図５に示す如く、保持突起（１８）を四角形状としても良いし、円形、楕円形、その他適宜の形状で形成しても良い。
【００３２】
上述の如き本発明の樹脂製保護キャップを装着した配管（１）では、クイックコネクタ等への挿入部（４）が保護され、曲げ加工工程への配管（１）の運搬時や保管時、更にはベンダへの設置時等に、多少の衝撃を受けても、挿入部（４）の外周に配設したメッキ被膜や樹脂被覆膜等の破損を良好に防止する事ができる。更に、キャップ本体（５）は断面コ字形の対称的な形状であるので、より整然とした積み上げや整列検査が可能で、嵩張りを防いで収納性や運搬性が向上するし、配管（１）からのキャップ本体（５）の不用意な脱落も防ぐものとなる。また、半透明のキャップ本体（５）を介して、内部の配管（１）を目視可能であるので、環状膨出部（３）の未加工の配管（１）が一目で発見でき、該配管（１）を曲げ加工ラインから外す事で、無駄な曲げ加工を省いて作業効率の向上が可能となるし、不良品の発生を防止する事が可能となる。また、低密度ポリエチレン等で形成する事により、キャップ本体（５）は過度の折れ曲がりや伸縮等の無い適度な硬度と自己潤滑性を有するものとなるから、配管（１）へのキャップ本体（５）の着脱作業を容易かつ迅速に行う事ができる。
【００３３】
そして、ベンダにて配管（１）の曲げ加工を行う際は、図６に示す如く、キャップ本体（５）を配管（１）に装着した状態で、チャック（１４）にてキャップ本体（５）の外周を保持して配管（１）を固定し、ストッパーとしてのチャック（１４）の内周面にキャップ本体（５）の底壁（６）を突き当てる。ここで、従来は、塩化ビニル製の不透明で底壁が傾斜した保護キャップを装着していたので、配管の先端部の位置を基準として曲げ平面位置の確定や、曲げ加工位置の確定を行いにくく、曲げ加工の前後で配管からの保護キャップの取り外し及び再装着作業を行う必要があり、非効率的であった。
【００３４】
しかし、本発明のキャップ本体（５）は、配管（１）の先端部（２）を突き当てる底壁（６）を軸方向に垂直で肉厚を、例えば１ｍｍとする均一な平坦面としているから、キャップ本体（５）の装着状態で配管（１）の先端部（２）の位置を正確に算出して特定できる。従って、先端部（２）を基準として、チャック（１４）やクランプ（１５）でのクランプ位置や、曲げ加工位置を高精度に特定可能となるし、チャック（１４）及びクランプ（１５）での配管（１）の安定的な固定が可能となる。そして、型ロール（１６）と受けロール（１７）との連動により、正確な位置で配管（１）の曲げ加工を行う事ができ、製品の品質を高める事ができる。また、キャップ本体（５）の脱着の手間を省いて、効率的な曲げ加工作業が可能となり、生産性を大きく向上させる事ができる。
【００３５】
また、樹脂製のキャップ本体（５）を介して配管（１）を保持するので、チャック（１４）による挿入部（４）のメッキ被膜や、特にその上層に配設した樹脂被覆膜の破損を良好に防止可能となり、クイックコネクタ内のシール部材等と挿入部（４）との信頼度の高い気密性が得られ、燃料漏れ等のない配管（１）の良好な使用が可能となる。
【００３６】
また、上記各実施例では、保護キャップを環状膨出部（３）を設けた配管（１）に使用しているが、環状膨出部（３）を設けない平滑な配管（１）の挿入部（４）の保護用に使用する事も勿論できる。また、この場合は、環状膨出部（３）が無いから大径部（１０）を設けずにキャップ本体（５）を形成し、底壁（６）から挿入口（７）まで段差の無い、平滑な内周面を有するものとしても良い。
【００３７】
【発明の効果】
本発明は上述の如く構成したもので、自動車や機械等に於いて、燃料や油等の流体供給用の鋼管、アルミ管、銅管、ステンレス鋼管、その他の配管のクイックコネクタへの挿入部に装着する保護キャップを、均一な肉厚とした底壁を有する断面コ字形に形成し、その底壁に配管の先端部を突き当てている。従って、保護キャップを装着した状態で、ベンダのチャックで配管を安定的に保持可能となるし、底壁をストッパーに突き当てる事で配管の先端部の位置及び曲げ平面位置を正確に特定可能となり、先端部を基準として曲げ加工位置の位置決めを、高精度に行う事ができる。そして、配管毎に曲げ加工位置が正確で高品質な製品を得る事ができる。
【００３８】
また、保護キャップの装着により、配管の運搬時や保管時の衝撃による配管の挿入部のメッキ被膜や特にその上層に配設した樹脂被覆膜等の破損を防止可能となるだけでなく、保護キャップを介してチャックにて配管を保持する事により、チャックによる挿入部のメッキ被膜や樹脂被覆膜等の破損も良好に防止する事ができる。また、保護キャップを断面形状がコ字形の対称的な形状としているので、より整然とした積み上げや整列検査が可能となり、嵩張りを防いで収納性、運搬性が向上し、保護キャップの不用意な脱落も良好に防止可能となる。更に、チャックによる曲げ加工時だけでなく、曲げ加工前後の配管の運搬、保管時等も保護キャップの装着状態で行う事ができる。そのため、配管の継ぎ手である挿入部の加工を行った後に、この挿入部に保護キャップを装着すれば、クイックコネクタ等による配管の接続作業時まで、保護キャップを外す必要がなく、終始保護キャップにて配管の挿入部を保護して、メッキ被膜や特にその上層の樹脂被覆膜等の破損を防止可能となる。従って、配管の接続先との信頼度の高い気密性を得る事ができ、燃料漏れ等の不具合を生じる事なく、自動車、その他装置での燃料の円滑な流通が可能となる。
【図面の簡単な説明】
【図１】本発明の第１実施例の保護キャップの断面図。
【図２】図１の挿入口側の平面図。
【図３】第２実施例の保護キャップの断面図。
【図４】図３の挿入口側の平面図。
【図５】第３実施例の保護キャップの断面図。
【図６】保護キャップを装着した配管をチャックにて保持して曲げ加工を行っている概念図。
【符号の説明】
１　配管
２　先端部
３　環状膨出部
５　キャップ本体
６　底壁
７　挿入口
８　小径部
１０　大径部
１１　係止突起
１２　抜け防止手段
１３　突条
１４　チャック
１８　保持突起[0001]
[Industrial applications]
The present invention relates to a resin protective cap for a pipe for protecting a joint of a pipe for supplying a fluid such as fuel or oil to an automobile or a machine, and positions a pipe in a state where the protective cap is attached. Or, the pipe is held by a chuck of a vendor so that the pipe can be bent with high accuracy.
[0002]
[Prior art]
Conventionally, when connecting metal or resin piping such as a fuel pipe of an automobile to a connection destination, a rubber hose or the like has been used, but in recent years, connection of piping using a quick connector or the like has become mainstream, and it is simpler. Rapid connection of piping is possible, and highly reliable airtightness can be obtained. During transportation and storage before assembling the piping, the outer periphery of the insertion portion should not be damaged so that the plating film or resin coating film on the insertion portion of the piping to the quick connector will not be damaged and the airtightness will be reduced. He was wearing a vinyl bottomed protective cap.
[0003]
This vinyl chloride protective cap is often made of black or other opaque products, and a horn-shaped pulling piece is continuously formed on the bottom to protrude in an inclined direction, and the horn-shaped pulling piece is held by a finger or a machine. By pulling, the protective cap can be removed from the piping.
[0004]
And when performing bending of the pipe in the bending line, the horn-shaped tension piece becomes a hindrance while the protective cap is attached, it is difficult to obtain a bending plane by the bender, and the tip of the pipe is referenced. Since it is difficult to accurately determine the clamp position and the bending position, the protective cap was once removed from the pipe, and the pipe was bent after being positioned. After the completion of the bending, the protective cap was reattached to the pipe, and the product was stored and transported to the delivery destination.
[0005]
[Problems to be solved by the invention]
However, it takes an enormous amount of time to remove and attach the protective cap to thousands or tens of thousands of pipes in the bending line, which is inefficient. When a protective cap is used for a pipe provided with an annular bulge, the pipe is a processed pipe or an unprocessed pipe of the annular bulge via an opaque vinyl chloride protective cap such as black. It is difficult to find out whether the product is visible, and there is a possibility that a defective product may occur. Further, vinyl chloride has a problem that it has a large effect on the environment. In addition, since the insertion part of the pipe is strongly held by the chuck of the vendor, there is a possibility that the plating film of the insertion part of the pipe and particularly the resin coating film disposed on the upper layer may be damaged, and the sealing member of the quick connector, etc. The airtightness may be deteriorated, leading to a fuel leak or the like. In addition, since the tension piece protrudes three-dimensionally in an oblique direction from the protective cap, there is a risk that the protective cap may be bulky and the storage capacity may be reduced, or the protective cap may be accidentally detached from the pipe due to a stimulus during transportation or the like. .
[0006]
The present invention is intended to solve the problems as described above. With the protective cap attached, the pipe can be attached to the chuck of the vendor, and the position of the tip of the pipe can be specified accurately. This makes it possible to perform the positioning of the bending position based on the part with high accuracy. By enabling accurate bending of the pipe with the protective cap attached in this way, the labor for attaching and detaching the protective cap can be omitted, and the productivity can be improved and the quality of the product can be improved. In addition, it prevents damage to the plating film and resin coating film on piping by the chuck of the vendor, obtains highly reliable airtightness with the connection destination of piping such as quick connectors, and has problems such as fuel leakage in the device. Can be satisfactorily prevented. In addition, the protective cap can be economically manufactured from inexpensive materials, and can be used and disposed with little effect on the human body and the environment.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention forms a cap body having a U-shaped cross section having one end as a bottom wall perpendicular to the axial direction of the pipe and the other end as an insertion port for the pipe, and forming the bottom wall uniformly. The bottom wall is made thick, and the tip of the pipe inserted from the insertion port can be abutted against this bottom wall. In this abutted state, the outer circumference of the cap body is held together with the pipe by the chuck of the bender, and the pipe can be bent. Things.
[0008]
The cap body is formed of a small-diameter portion on the bottom wall side and a large-diameter portion on the insertion port side, and a pipe provided with an annular bulging portion is inserted from the insertion port, and a tip of the pipe is attached to the bottom wall. The annular bulging portion of the pipe may be arranged at the large diameter portion in a state where the pipe bulges against the large diameter portion.
[0009]
Further, the cap body may be configured so that the outer peripheral surface of the pipe can be held between the inner peripheral surface.
[0010]
In addition, the cap body may be provided with a plurality of ridges in the axial direction on the inner circumferential surface capable of abutting the outer circumferential surface of the pipe and holding the pipe, or a plurality of holding protrusions.
[0011]
The large diameter portion is provided with a plurality of locking projections on the inner peripheral surface so that the inscribed circle diameter is smaller than the outer diameter of the annular bulging portion of the pipe. The protruding portion can get over the locking projection, but when the cap main body is mounted, the annular bulging portion may come into contact with the projection to serve as a slip-off preventing means.
[0012]
[Action]
The present invention is configured as described above. When a protective cap is attached to a pipe, the distal end of the pipe abuts against a bottom wall provided vertically in the axial direction, and the distal end and the outer peripheral surface of the pipe are protected by the protective cap. In addition, it is possible to prevent damage to the plating film, the resin coating film, and the like of the piping due to a stimulus at the time of stacking or transporting a large amount of piping. In addition, unlike conventional products, a symmetrical shape with a U-shaped cross-section is used without providing a pulling piece that projects diagonally, enabling more orderly stacking and alignment inspection, preventing bulkiness, and storing and transporting. As a result, careless dropping of the protective cap can be prevented.
[0013]
Then, in order to perform the bending process on the pipe, the outer periphery of the protective cap is held by the chuck of the vendor to fix the pipe. In the prior art, since the bottom wall of the protective cap is inclined, a bent plane cannot be obtained, and it is necessary to remove the protective cap from the pipe once, perform bending, and then attach the protective cap again. In addition, the protection cap was attached and detached for each pipe, which was inefficient.
[0014]
However, in the present invention, the bottom wall against which the tip of the pipe abuts is formed perpendicular to the axial direction of the pipe and has a uniform thickness. The position of the bending plane can be determined with high accuracy based on the tip. Also, even if the tip of the pipe does not contact the bottom wall due to vibration during transportation, etc., push the pipe toward the bottom wall with the bottom wall in contact with the stopper of the chuck, so that the tip can be securely held. It can be in contact with the bottom wall.
[0015]
Therefore, the bending position can be determined with high accuracy based on the position of the tip of the pipe while the protective cap is still attached, and the pipe can be bent. It is possible to greatly improve the productivity in the line, and it is possible to obtain a high-quality product in which each pipe has a uniform bending position. In addition, since the pipe is held through the protective cap, the plating film or the resin coating film at the insertion portion of the pipe is not damaged by the chuck, and the airtightness between the seal member of the quick connector and the pipe is maintained. In addition, problems such as fuel leakage can be prevented. Also, there is no need to remove the protective cap from the pipe insertion part until the pipe is connected, bent, or transported after bending, as well as when connecting the pipe with a quick connector. The insertion portion of the pipe can be protected, and a high leakage prevention effect of the pipe can be obtained by an excellent damage prevention effect of the plating film or the resin coating film of the insertion portion.
[0016]
In the case of a pipe having an annular bulge on the outer periphery, the cap body is formed from a small-diameter part on the bottom wall side and a large-diameter part on the insertion port side, and the annular bulge is arranged on this large-diameter part. Alternatively, the annular bulge may be protected from impact. Then, the pipe provided with the annular bulge is inserted from the insertion port, and the pipe has a dimension such that the annular bulge of the pipe is positioned at the large-diameter portion with the tip of the pipe abutting against the bottom wall. Make sure that the end of the pipe abuts against the bottom wall. Also, the cap body provided with the large-diameter portion and the small-diameter portion does not have the annular bulging portion, and may be used for a pipe having a smooth outer peripheral surface. A means for easily removing the cap body from the pipe by hooking a fingernail or a tool in the gap can also be used.
[0017]
In addition, if the cap body allows the outer peripheral surface of the pipe to be clamped by the inner peripheral surface, the inner peripheral surface can securely clamp the pipe even if it receives a slight impact while the protective cap is attached, and The cap is less likely to be accidentally dropped from the pipe. However, when the cap body is composed of a small-diameter portion and a large-diameter portion, the inner peripheral surface of the small-diameter portion can hold the distal end side of the annular bulging portion of the pipe.
[0018]
In addition, if the cap body is provided on the inner peripheral surface with a plurality of ridges in the axial direction that can abut the outer peripheral surface of the pipe and can clamp the pipe, or provided with a plurality of holding projections, the entire inner peripheral surface of the small-diameter portion can be connected to the pipe. As in the case where the protective cap is sandwiched, careless dropping of the protective cap from the pipe can be satisfactorily prevented. Furthermore, the surface pressure acting on the outer peripheral surface of the pipe is partially increased as compared with the case where the pipe is sandwiched on the entire inner peripheral surface of the small-diameter portion, but due to the gap between the inner peripheral surface of the small-diameter portion and the outer peripheral surface of the pipe. Since air flows in and out, the work of attaching and detaching the protective cap can be performed more smoothly. When the cap body is composed of a small-diameter portion and a large-diameter portion, the ridge or the holding projection is provided on the inner peripheral surface of the small-diameter portion.
[0019]
Further, in the case of a protective cap for piping provided with an annular bulge, the large-diameter portion where the annular bulge is arranged is such that the inscribed circle diameter is smaller than the outer diameter of the annular bulge of the pipe. It may be formed by providing a plurality of locking projections on the inner peripheral surface. Then, at the time of pipe attaching / detaching work, the annular bulging portion can get over the locking protrusion due to the elasticity of the resin forming the cap body, but when the cap body is mounted, the annular bulging portion comes into contact with the locking protrusion. It can be used as a slip-off prevention means. By this slip-off prevention means, even if a slight pull-out force is applied while the protective cap is attached, the protective cap is prevented from being accidentally dropped, but the attachment and detachment of any protective cap manually or mechanically is smooth. What you can do.
[0020]
In addition, since the tip of the pipe surely abuts against the bottom wall and the position of the tip can be specified based on the thickness of the bottom wall, the cap body may be opaque, such as black, as in the prior art. However, if the cap body is formed of a transparent or translucent resin, the position of the tip can be reliably determined from the outer surface of the cap body, and the working efficiency of bending can be further improved. In particular, in the case of piping provided with an annular bulge, the presence of the annular bulge can be clearly checked with the cap body attached, and the unsorted product can be efficiently sorted out. The generation of non-defective products can also be suppressed.
[0021]
Further, as the transparent or opaque resin material, it is preferable to use polyethylene, polyamide, polypropylene, polyacetal, or the like, so that the material cost is low and easy molding is possible, and the cap body can be formed at low cost. In addition, compared to a conventional vinyl chloride protective cap that is highly adhesive and flexible, the cap body formed of the above resin has appropriate hardness and self-lubricating property without excessive bending or expansion and contraction, and the cap body has The attachment / detachment work can be performed more smoothly. In addition, vinyl chloride has a large effect on the environment, but polyethylene, polyamide, polypropylene, polyacetal, and the like enable safe use and disposal, and can be easily recycled.
[0022]
【Example】
FIG. 1 is a cross-sectional view of a protective cap according to a first embodiment of the present invention, in which a pipe can be pinched by an inner peripheral surface of a small diameter portion. FIG. 2 is a plan view of the insertion port side in FIG. 1 in which three locking projections are provided as a detachment prevention means in the diameter portion. In the second embodiment shown in FIG. 3, the pipe can be clamped by a ridge provided on the inner peripheral surface of the small-diameter portion, and six locking projections are provided on the large-diameter portion. FIG. 4 is a plan view of the insertion port side in FIG. 3. In the third embodiment shown in FIG. 5, the pipe can be held by holding projections provided on the inner peripheral surface of the small diameter portion. FIG. 6 shows a conceptual diagram in which a pipe is held and fixed in a state where a protective cap is mounted and bending is performed.
[0023]
First, in each of the above embodiments, (1) is a pipe, which is formed of a metal or resin such as a single-wound steel pipe, a double-wound steel pipe, or an aluminum pipe having a relatively small diameter of 30 mm or less. An annular bulge (3) is protruded from the outer peripheral surface at a fixed interval from 2) by spool processing, and a portion including the annular bulge (3) from the tip (2) is connected to a quick connector or the like. An insertion portion (4) is provided as a joint to the means.
[0024]
A protective cap for mounting on the insertion portion (4) including the tip (2) and the annular bulge (3) of the pipe (1) and protecting it from impacts allows the internal pipe (1) to be easily visually observed. A cap body (5) is formed of a possible translucent low-density polyethylene, and one end of the cap body (5) is a bottom wall (6) perpendicular to the axial direction of the pipe (1), and the other end is a pipe (1). ) Is formed in a cylindrical shape having a U-shaped cross section. Further, the cylindrical portion has a small-diameter portion (8) on the bottom wall (6) side, a tip (2) side of the pipe (1) closer to the annular bulging portion (3), and an insertion port (7). ) Side is a large diameter portion (10), and the annular bulging portion (3) of the pipe (1) can be arranged. In the above description, the cap body (5) is formed of low-density polyethylene, which is a kind of polyethylene, but may be formed of polyamide, polypropylene, polyacetal, or the like.
[0025]
Also, the formation length of the small-diameter portion (8) shown in FIG. 1A is shorter than the formation length b from the tip (2) of the pipe (1) to the annular bulge (3). 1. As shown in FIG. 3, when the pipe (1) is inserted into the cap body (5), the pipe (1) is formed to have such a size that the tip (2) of the pipe (1) surely abuts against the bottom wall (6). . Further, the bottom wall (6) is formed with a uniform thickness of about 1 mm so that the position of the tip (2) of the pipe (1) abutting against the bottom wall (6) can be accurately specified.
[0026]
In the first embodiment shown in FIGS. 1 and 2, the inner diameter of the small diameter portion (8) is formed to be substantially the same as the outer diameter of the raw tube of the pipe (1), and the inner circumference of the small diameter portion (8) is formed. The outer surface of the pipe (1) can be sandwiched between the surfaces, so that the cap body (5) can be easily attached to the pipe (1) and the pipe (1) is prevented from being accidentally pulled out.
[0027]
The large-diameter portion (10) has an inner diameter slightly larger than the outer diameter of the annular bulging portion (3), and the annular bulging portion is provided on the inner peripheral surface side of the insertion port (7). Three locking projections (11) capable of contacting (3) are provided circumferentially inside. These three locking projections (11) are provided in such a manner that the diameter of the inscribed circle is slightly smaller than the outer diameter of the annular bulge (3), and the annular bulge (3) is formed. By contacting the locking projections (11), a means (12) for preventing the pipe (1) from coming off is provided. In addition, by providing the locking projection (11) on the side of the insertion port (7), the annular bulging portion (3) can be formed with the tip (2) of the pipe (1) abutting against the bottom wall (6). The protective cap of the present invention can be used for a pipe (1) formed to have a size that abuts on the locking projection (11), and as shown in FIG. The length of the annular bulge (3) is such that the annular bulge (3) does not come into contact with the locking projection (11) in a state where the formed length up to 3) is relatively short, and the tip (2) is in contact with the bottom wall (6). It can also be used for the formed pipe (1), and can be a product with excellent versatility.
[0028]
The detachment prevention means (12) allows the detachment of the cap body (5) to the pipe (1), even when a slight detachment force is applied when the cap body (5) is transported or installed in a bending device. The back surface of the annular bulging portion (3) abuts the locking projection (11) to prevent the annular bulging portion (3) from coming off. However, when the pipe (1) is attached to or detached from the cap body (5), polyethylene, polyamide, polypropylene, and polyacetal Due to the elasticity of the resin material such as the above, the annular bulging portion (3) can get over the locking projection (11), and a smooth attaching / detaching operation is possible.
[0029]
In contrast to the first embodiment, in the second embodiment shown in FIGS. 3 and 4, the inner diameter of the small diameter portion (8) is formed to be larger than the outer diameter of the raw pipe of the pipe (1). Four protruding ridges (13) are provided on the peripheral surface of the pipe (1) in contact with the outer peripheral surface of the pipe (1) and capable of holding the pipe (1) in the axial direction. By enabling the outer peripheral surface of the pipe (1) to be sandwiched by these four ridges (13), an effect of holding stability and prevention of detachment can be obtained, and the inner diameter of the small diameter portion (8) of the first embodiment can be improved. Although the surface pressure partially increases as compared with the case where the pipe (1) is sandwiched by the entire peripheral surface, air enters and exits from a gap between the inner peripheral surface of the small diameter portion (8) and the outer peripheral surface of the pipe (1). Therefore, the work of attaching and detaching the protective cap can be performed more smoothly.
[0030]
Also, in the second embodiment, a plurality of types of pipes (1) having different formation lengths from the distal end portion (2) to the annular bulging portion (3) can be prevented from coming off. As (12), as shown in FIGS. 3 and 4, six locking projections (11) are provided alternately at regular intervals in the axial direction on the inner peripheral surface of the large-diameter portion (10). By arranging such locking projections (11), the rear surface of the annular bulging portion (3) formed at an arbitrary position of the pipe (1) is, as shown in FIG. It comes into contact with any one of the stop projections (11), and it is possible to satisfactorily prevent inadvertent removal of the pipe (1) from the cap body (5).
[0031]
Further, in the second embodiment, the ridge (13) is provided on the inner peripheral surface of the small diameter portion (8). However, as in the third embodiment shown in FIG. 5, the inner peripheral surface of the small diameter portion (8) is provided. A plurality of holding projections (18) are provided at regular intervals in the axial direction, and a plurality of sets of the holding projections (18) arranged in the axial direction are arranged at regular intervals in the circumferential direction so that each holding projection is provided. At (18), the outer peripheral surface of the pipe (1) can be held and fixed. If the pipe (1) can be held, the holding projections (18) may not be provided at regular intervals in the axial direction and the circumferential direction as in the third embodiment, but may be provided at random. As shown, the holding projection (18) may be formed in a square shape, a circular shape, an elliptical shape, or another appropriate shape.
[0032]
In the pipe (1) equipped with the resin protective cap of the present invention as described above, the insertion portion (4) to the quick connector or the like is protected, and the pipe (1) is transported or stored in the bending process, and furthermore, Can effectively prevent the plating film and the resin coating film disposed on the outer periphery of the insertion portion (4) from being damaged even when receiving a slight impact when the device is installed in a vender. Further, since the cap body (5) has a symmetrical shape with a U-shaped cross section, it is possible to perform more orderly stacking and alignment inspection, prevent bulkiness, improve storage and transportability, and improve piping (1). It also prevents the cap body (5) from accidentally falling off the cap. Further, since the internal pipe (1) can be visually observed through the translucent cap body (5), the unprocessed pipe (1) of the annular bulge (3) can be found at a glance. By removing (1) from the bending line, it is possible to improve the work efficiency by eliminating unnecessary bending, and to prevent the occurrence of defective products. In addition, by forming the cap body (5) from low-density polyethylene or the like, the cap body (5) has appropriate hardness and self-lubricating property without excessive bending or expansion and contraction. ) Can be easily and quickly performed.
[0033]
When bending the pipe (1) by the vendor, as shown in FIG. 6, the cap body (5) is attached to the pipe (1) with the cap body (5) by the chuck (14), as shown in FIG. The pipe (1) is fixed while holding the outer periphery of the cap, and the bottom wall (6) of the cap body (5) is abutted against the inner peripheral surface of the chuck (14) as a stopper. Here, conventionally, since a protective cap made of opaque vinyl chloride with an inclined bottom wall was conventionally mounted, it is difficult to determine a bending plane position or a bending processing position with reference to the position of the tip of the pipe. In addition, before and after the bending, it is necessary to remove and reattach the protective cap from the pipe, which is inefficient.
[0034]
However, in the cap body (5) of the present invention, the bottom wall (6) against which the tip (2) of the pipe (1) abuts is a uniform flat surface perpendicular to the axial direction and having a thickness of, for example, 1 mm. Thus, the position of the tip (2) of the pipe (1) can be accurately calculated and specified with the cap body (5) mounted. Therefore, the clamp position and the bending position at the chuck (14) and the clamp (15) can be specified with high precision based on the tip (2), and the chuck (14) and the clamp (15) can be specified. The pipe (1) can be stably fixed. Then, by the interlocking of the mold roll (16) and the receiving roll (17), the pipe (1) can be bent at an accurate position, and the quality of the product can be improved. Further, the labor for attaching and detaching the cap body (5) can be omitted, the bending operation can be performed efficiently, and the productivity can be greatly improved.
[0035]
Further, since the pipe (1) is held through the resin cap body (5), the plating film of the insertion portion (4) by the chuck (14), and particularly the resin coating film disposed on the upper portion thereof is damaged. Satisfactorily can be prevented, a highly reliable airtightness between the sealing member or the like in the quick connector and the insertion section (4) can be obtained, and the pipe (1) free from fuel leakage and the like can be used favorably.
[0036]
In each of the above embodiments, the protective cap is used for the pipe (1) provided with the annular bulge (3), but the insertion of the smooth pipe (1) without the annular bulge (3) is performed. Of course, it can be used for protecting the portion (4). In this case, since there is no annular bulge (3), the cap body (5) is formed without providing the large-diameter portion (10), and there is no step from the bottom wall (6) to the insertion port (7). It may have a smooth inner peripheral surface.
[0037]
【The invention's effect】
The present invention is configured as described above, and in an automobile, a machine, or the like, a steel pipe for supplying a fluid such as fuel or oil, an aluminum pipe, a copper pipe, a stainless steel pipe, and other pipes are inserted into a quick connector. The protection cap to be mounted is formed in a U-shaped cross section having a bottom wall having a uniform thickness, and the tip of the pipe is abutted against the bottom wall. Therefore, the pipe can be stably held by the chuck of the vendor with the protective cap attached, and the position of the tip of the pipe and the bending plane position can be accurately specified by abutting the bottom wall against the stopper. The positioning of the bending position can be performed with high accuracy based on the tip. In addition, it is possible to obtain a high-quality product in which the bending position is accurate for each pipe.
[0038]
In addition, by installing a protective cap, it is possible not only to prevent damage to the plating film at the insertion part of the pipe due to the impact during transportation and storage of the pipe, especially the resin coating film disposed on the upper layer, but also to protect it. By holding the pipe with the chuck via the cap, the damage of the plating film or the resin coating film on the insertion portion by the chuck can be prevented well. In addition, since the protective cap has a symmetrical U-shaped cross section, more orderly stacking and alignment inspection is possible, preventing bulkiness, improving storage and transportability, and providing care for the protective cap. Dropping can also be prevented well. Furthermore, not only the bending process by the chuck but also the transportation and storage of the pipe before and after the bending process can be performed with the protective cap attached. Therefore, if a protective cap is attached to this insertion part after processing the insertion part, which is a pipe joint, there is no need to remove the protection cap until the pipe connection work using a quick connector etc. Thus, the insertion portion of the pipe can be protected to prevent the plating film and particularly the resin coating film on the plating film from being damaged. Therefore, highly reliable airtightness with the pipe connection destination can be obtained, and the fuel can be smoothly circulated in the automobile and other devices without causing a problem such as fuel leakage.
[Brief description of the drawings]
FIG. 1 is a sectional view of a protective cap according to a first embodiment of the present invention.
FIG. 2 is a plan view of the insertion port side of FIG.
FIG. 3 is a sectional view of a protective cap according to a second embodiment.
FIG. 4 is a plan view of the insertion port side of FIG. 3;
FIG. 5 is a sectional view of a protective cap according to a third embodiment.
FIG. 6 is a conceptual diagram in which a pipe to which a protective cap is attached is bent by a chuck.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Piping 2 Tip part 3 Annular bulge part 5 Cap main body 6 Bottom wall 7 Insertion opening 8 Small diameter part 10 Large diameter part 11 Locking projection 12 Detachment prevention means 13 Ridge 14 Chuck 18 Holding projection

Claims

A cap body having a U-shaped cross section with one end being a bottom wall perpendicular to the axial direction of the pipe and the other end being an insertion port for the pipe was formed, the bottom wall was made uniform in thickness, and inserted into the bottom wall from the insertion port. A resin protective cap for piping, wherein a tip of a pipe can be abutted, and in this abutted state, the outer circumference of a cap body is held together with a pipe by a chuck of a vendor to enable bending of the pipe.

The cap body is formed from a small-diameter portion on the bottom wall side and a large-diameter portion on the insertion port side, inserts a pipe provided with an annular bulging portion from the insertion port, and projects the tip of the pipe into the bottom wall. 2. The resin protective cap for piping according to claim 1, wherein the annular bulging portion of the piping is arranged on the large-diameter portion in a state of being applied.

The resin protective cap for piping according to claim 1 or 2, wherein the cap body is capable of holding the outer peripheral surface of the pipe with the inner peripheral surface.

The pipe body according to claim 1, wherein the cap body is provided with a plurality of ridges in an axial direction or a plurality of holding protrusions, which are provided on an inner circumferential surface of the cap body so as to abut the outer circumferential surface of the pipe and hold the pipe. Resin protective cap.

The large diameter portion is provided with a plurality of locking projections on the inner peripheral surface so that the inscribed circle diameter is smaller than the outer diameter of the annular bulging portion of the pipe. 3. The resin protective cap for piping according to claim 2, wherein the annular protrusion is in contact with the protrusion when the cap body is mounted, so that the protrusion is capable of slipping over the locking protrusion.