JP2004225711A - End structure for water pipe, water pipe with end structure, water pipe-to-connector connection structure, and water pipe end structure forming method - Google Patents

End structure for water pipe, water pipe with end structure, water pipe-to-connector connection structure, and water pipe end structure forming method Download PDF

Info

Publication number
JP2004225711A
JP2004225711A JP2002362315A JP2002362315A JP2004225711A JP 2004225711 A JP2004225711 A JP 2004225711A JP 2002362315 A JP2002362315 A JP 2002362315A JP 2002362315 A JP2002362315 A JP 2002362315A JP 2004225711 A JP2004225711 A JP 2004225711A
Authority
JP
Japan
Prior art keywords
connection
water pipe
pipe
main body
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002362315A
Other languages
Japanese (ja)
Other versions
JP4245127B2 (en
Inventor
Shohachi Shimizu
昭八 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mirai Industry Co Ltd
Original Assignee
Mirai Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2002362315A priority Critical patent/JP4245127B2/en
Application filed by Mirai Industry Co Ltd filed Critical Mirai Industry Co Ltd
Priority to PCT/JP2002/013509 priority patent/WO2003056227A1/en
Priority to KR10-2004-7010049A priority patent/KR20040071251A/en
Priority to CN028260414A priority patent/CN100406797C/en
Priority to EP02793380A priority patent/EP1460324A4/en
Priority to AU2002360021A priority patent/AU2002360021A1/en
Priority to US10/499,836 priority patent/US7350831B2/en
Publication of JP2004225711A publication Critical patent/JP2004225711A/en
Application granted granted Critical
Publication of JP4245127B2 publication Critical patent/JP4245127B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide an end structure for a water pipe capable of minimizing the load applied to an end part at the time of diameter enlarging work to a pipe main body, and reducing flow loss at the end part of the pipe main body as the pipe main body is connected to a connector, a water pipe provided with the end structure, a connection structure capable of connecting the water pipe provided with the end structure to the connector, and a method for forming the end structure in the water pipe. <P>SOLUTION: For the end structure 10 for the water pipe 11, a ring body 13 of metal material is inserted inside a right end part of the pipe main body 11a. The ring body 13 is enlarged from the inner side, so that inner diameter of the ring body 13 is roughly similar to inner diameter of the pipe main body 11a at a non-enlarged diameter part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば継手、分岐継手等の接続体に接続され、給水管として使用される合成樹脂材料製の通水管の管本体の端部における流体の流量損失を小さくすることができるとともに、通水管と接続体との接続作業における通水管に作用する負荷を低減させることができる通水管の端部構造に関する。また、前記端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法に関するものである。
【０００２】
【従来の技術】
従来より、例えば継手等の接続体と、給水管として使用される合成樹脂材料製の通水管とは、両者の接続部分における流体の流量損失を小さくさせるように接続されている（例えば、特許文献１参照。）。例えば図１８に示すように、通水管１０１は管本体１０１ａよりなり、その管本体１０１ａが接続される前記継手１０２は、金属材料により略円筒状に形成されている。継手１０２の一端部には前記通水管１０１の内側に挿入されるインナー体としての接続筒部１０３が突設され、他端部には管体（図示せず）が接続可能に形成されている。前記接続筒部１０３の外周面には同接続筒部１０３の周方向に沿って外方へ突出する突条１０３ａが一定間隔をおいて複数箇所に形成されている。
【０００３】
上記継手１０２に通水管１０１を接続するには、まず、通水管１０１と継手１０２の接続状態で、管本体１０１ａの内径と、接続筒部１０３の内径とをほぼ同じにし、接続筒部１０３による流体の流量損失を小さくするため、管本体１０１ａの端部を拡径治具（図示せず）を使用して拡径する。そして、管本体１０１ａの拡径された端部が自己の収縮力により元の状態に復帰する前に管本体１０１ａの拡径部分を接続筒部１０３の外周面に装着する。すると、管本体１０１ａが前記収縮により縮径して管本体１０１ａの内周面が接続筒部１０３の外周面に圧接する。さらに、拡径された管本体１０１ａの端部に合成樹脂材料によりリング状に形成された固定リング１０４を外嵌する。
【０００４】
すると、前記固定リング１０４の収縮に伴う縮径により管本体１０１ａの端部が外周側から締め付けられ、管本体１０１ａの端部が固定リング１０４と接続筒部１０３との間に挟持される。その結果、管本体１０１ａの内周面に突条１０３ａが食い込み、管本体１０１ａが接続筒部１０３に抜け止めされ、通水管１０１が継手１０２に抜け止めされた状態に接続される。
【０００５】
【特許文献１】
特開２０００−２３８４号公報
【０００６】
【発明が解決しようとする課題】
ところが、上記従来の通水管１０１と継手１０２との接続構造において、管本体１０１ａの端部を接続筒部１０３の外周に装着するには、前記端部の内径が接続筒部１０３の外径より大きくなるように拡径しなければならない。即ち、管本体１０１ａの端部の内周面が接続筒部１０３の外周面に圧接する状態よりも、端部の内径が大きくなるように拡径しなければならなず、管本体１０１ａの端部には必要以上に大きな負荷が作用するという問題があった。
【０００７】
本発明は、上記従来技術に存在する問題点に着目してなされたものである。その目的とするところは、管本体の拡径作業時に端部に作用する負荷を最小限に抑えるとともに、管本体と接続体との接続状態において、管本体の端部における流量損失を小さくすることができる通水管の端部構造及び端部構造を備えた通水管を提供することにある。その他の目的とするところは、管本体の拡径作業時に端部に作用する負荷を最小限に抑えるとともに、管本体と接続体との接続状態において、管本体の端部における流量損失を小さくすることができる端部構造を備えた通水管と、接続体とを接続することができる接続構造を提供することにある。さらに、その他の目的とするところは、管本体の拡径作業時に端部に作用する負荷を最小限に抑えるとともに、管本体と接続体との接続状態において、管本体の端部における流量損失を小さくすることができる端部構造を形成することができる形成方法を提供することにある。
【０００８】
【課題を解決するための手段】
上記問題点を解決するために、請求項１に記載の発明は、合成樹脂材料製の通水管の管本体の端部における流量損失を小さくするために、当該管本体の端部に形成される通水管の端部構造であって、前記管本体の端部の内側に挿入された環状をなす金属材料製のインナー体が、当該インナー体の内径と、非拡径部分の管本体の内径とがほぼ同一となるように内側から拡径されていることを要旨とする。
【０００９】
請求項２に記載の発明は、請求項１に記載の通水管の端部構造において、前記インナー体の拡径により管本体の外面から外方へ突出し、接続体の接続筒部に設けられる接続手段の係合部が係合して管本体を接続筒部に抜け止めした状態に接続する接続用膨出部が形成されていることを要旨とする。
【００１０】
請求項３に記載の発明は、請求項１又は請求項２に記載の通水管の端部構造において、前記インナー体は環状のリング体により形成されていることを要旨とする。
【００１１】
請求項４に記載の発明は、請求項１又は請求項２に記載の通水管の端部構造において、前記インナー体は線材を環状に巻回して形成されていることを要旨とする。
【００１２】
請求項５に記載の発明は、請求項１又は請求項２に記載の通水管の端部構造において、前記インナー体は筒体により形成されていることを要旨とする。
請求項６に記載の発明は、請求項１に記載の通水管の端部構造において、前記インナー体は筒体により形成され、管本体内への挿入状態において、管本体の端面から延出する延出部を備え、当該延出部は管本体を接続体に接続するための固定部であることを要旨とする。
【００１３】
請求項７に記載の発明は、請求項１〜請求項６のいずれか一項に記載の端部構造が管本体の一端又は両端に設けられていることを要旨とする。
請求項８に記載の発明は、請求項２〜請求項５のいずれか一項に記載の端部構造を備えた通水管を、接続体に抜け止めした状態で接続するために形成される通水管と接続体との接続構造であって、前記管本体の接続用膨出部と、接続筒部に設けられた接続手段の係合部との係合により形成されていることを要旨とする。
【００１４】
請求項９に記載の発明は、請求項８に記載の端部構造を備えた通水管と接続体との接続構造において、前記接続手段は、接続筒部に螺合して取り付けられ、その取付状態で接続用膨出部に係合する係合部を備えた抜脱防止スリーブにより形成されていることを要旨とする。
【００１５】
請求項１０に記載の発明は、請求項８に記載の端部構造を備えた通水管と接続体との接続構造において、前記接続手段は、係合部を備えた係合体と、当該係合体と接続用膨出部との係合を維持すべく接続筒部に取り付けられる取着体とにより形成されていることを要旨とする。
【００１６】
請求項１１に記載の発明は、請求項１０に記載の端部構造を備えた通水管と接続体との接続構造において、前記取着体は、前記係合体を内部に保持して接続筒部に螺合して取り付けられる固定スリーブにより形成されていることを要旨とする。
【００１７】
請求項１２に記載の発明は、請求項１１に記載の端部構造を備えた通水管と接続体との接続構造において、前記固定スリーブは、管本体の接続用膨出部が形成された端部側から同接続用膨出部の外側を通過して管本体に装着されることを要旨とする。
【００１８】
請求項１３に記載の発明は、請求項１０〜請求項１２のいずれか一項に記載の端部構造を備えた通水管と接続体との接続構造において、前記係合体は複数の分割体を組付けることにより形成され、前記接続用膨出部の形成後に、当該接続用膨出部に係合して取り付けられることを要旨とする。
【００１９】
請求項１４に記載の発明は、請求項１０に記載の端部構造を備えた通水管と接続体との接続構造において、前記取着体は、接続筒部内に挿入された係合体の同接続筒部内からの抜脱を防止すべく接続筒部に取着されるピン体により形成されていることを要旨とする。
【００２０】
請求項１５に記載の発明は、合成樹脂材料製の通水管の管本体の端部における流量損失を小さくするための端部構造を、当該管本体に形成する方法であって、前記管本体の端部の内側に環状をなす金属材料製のインナー体を挿入し、同インナー体を、当該インナー体の内径と、非拡径部分の管本体の内径とがほぼ同一となるように内側から拡径することを要旨とする。
【００２１】
【発明の実施の形態】
（第１の実施形態）
以下、本発明を具体化した通水管の端部構造、端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法の一実施形態を図１〜図４に従って説明する。尚、第１の実施形態の以下の説明における上下左右は、図１における上下左右に対応する。
【００２２】
図１に示すように、通水管１１の端部構造１０は、合成樹脂材料製の管本体１１ａよりなる通水管１１を、前記管本体１１ａの端部における流量損失を小さくするために、当該管本体１１ａの右端部に形成されるものである。そして、接続体としての継手１２に接続された通水管１１の端部における流量損失を小さくすることができる。具体的には、前記管本体１１ａの右端部の内側には金属材料製のインナー体としてのリング体１３が挿入され、同リング体１３が内側から拡径されて当該リング体１３の内径と、非拡径部分の管本体１１ａの内径とがほぼ同一に形成されているものである。
【００２３】
図２（ａ）に破線に示すように、前記リング体１３は金属材料（本実施形態では銅を使用）により円環状に形成され、管本体１１ａ内に挿入される前のリング体１３の外径は管本体１１ａの内径よりわずかに小さく形成されている。リング体１３が管本体１１ａの内側から拡径されることにより、管本体１１ａの右端部には外方へ突出する接続用膨出部１１ｂが形成されている。
【００２４】
図１及び図２（ａ）に示すように、通水管１１が接続される継手１２は合成樹脂材料又は金属材料により略円筒状に形成された継手本体１２ａ、係合スリーブ１９及び固定スリーブ２０により主に形成されている。この第１の実施形態では、前記継手本体１２ａ、係合スリーブ１９及び固定スリーブ２０を合成樹脂材料により形成した。前記継手本体１２ａの左端部には管本体１１ａを接続するための接続筒部１４が形成され、右端部は管体（図示せず）に接続可能に形成されている。前記接続筒部１４の外周面には雄ネジ１５が螺刻されている。また、図１に示すように、継手本体１２ａの接続筒部１４の内部には円環状をなす第１当接面１６が形成され、同第１当接面１６より継手本体１２ａの左端側の内周面にはゴム材料によりリング状に形成されたシール部材１７が２箇所に装着されている。なお、シール部材１７は継手本体１２ａ内に１箇所だけに装着されていてもよく、３箇所以上に装着されていてもよい。前記シール部材１７より継手本体１２ａの左端側には、円環状をなし、前記第１当接面１６より内径及び外径が大きい第２当接面１８が形成されている。
【００２５】
図２（ａ）に示すように、接続筒部１４に設けられる接続手段の係合体としての係合スリーブ１９は右側の外径より左側の外径が小さく形成された筒状をなし、ほぼ中央部には係合スリーブ１９の右側から左側に向かうに連れて外径が縮径する縮径部１９ｃが形成されている。図２（ｂ）に示すように、係合スリーブ１９は半筒状をなす一対の分割体１９ａを組付けることにより形成されている。分割体１９ａ同士は一側縁同士が連結されることにより一体化され、その連結部を中心として分割体１９ａ同士を離間又は組付け可能に形成されている。係合スリーブ１９の内周面には、係合スリーブ１９を管本体１１ａの外周面に装着したとき、前記接続用膨出部１１ｂが係合可能な係合部としての係合凹条１９ｂが係合スリーブ１９の周方向に沿って凹設されている。
【００２６】
前記接続筒部１４に螺合して取り付けられる接続手段を形成する取着体としての固定スリーブ２０は略円筒状をなし、固定スリーブ２０の左端部は同固定スリーブ２０の右端側に向かうに連れて外径及び内径が拡径するように形成されている。固定スリーブ２０の左端側には、前記係合スリーブ１９の左端側の外径よりわずかに大きい直径を有する内孔２０ａが形成されている。前記内孔２０ａの直径は、管本体１１ａの外径に前記リング体１３を形成する線材の直径の二倍の値を加えた値よりわずかに大きく設定されている。また、固定スリーブ２０の右端側の内周面には前記雄ネジ１５に螺合可能な雌ネジ２０ｂが螺刻されている。そして、継手本体１２ａに固定スリーブ２０を螺合して、継手本体１２ａと固定スリーブ２０との間に係合スリーブ１９を位置決めすることにより継手１２が形成される。
【００２７】
次に、前記リング体１３を拡径して管本体１１ａに接続用膨出部１１ｂを形成する拡径工具２１について説明する。図３（ａ）、（ｂ）及び図４に示すように、前記拡径工具２１は、前記接続用膨出部１１ｂを形成する前記リング体１３を備えた挿入体２４と、同挿入体２４の内側に挿入された状態で設けられ、管本体１１ａの端部内に挿入される引抜体２２とより主に形成されている。前記引抜体２２は金属材料により筒状に形成され、図４において、引抜体２２の左端部には、同引抜体２２の軸線方向に沿って一定の外径を有する拡径部２２ａが形成されている。この拡径部２２ａの直径は管本体１１ａの内径とほぼ同じに形成され、さらに、引抜体２２は、拡径部２２ａから同引抜体２２の右端側に向かうに連れて外径が縮径するようにテーパ状に形成されている。
【００２８】
また、図３（ｂ）に示すように、引抜体２２には同引抜体２２を管本体１１ａ内から引き抜く作業を行うための引抜ピン２３が取り付けられている。この引抜ピン２３は、引抜体２２内に配置された引抜ピン２３の頭部２３ａが引抜体２２の右端側の内周縁部に係止することにより引抜ピン２３が引抜体２２の右側から抜け外れないように取り付けられている。
【００２９】
前記挿入体２４は略円筒状をなし、その挿入体２４の左側には内部に引抜体２２を挿入可能な筒状部２４ａを備え、その筒状部２４ａの右側には前記引抜ピン２３の軸部を挿通支持可能な挿通支持部２４ｂが延設されている。また、筒状部２４ａの左側の開口端には前記リング体１３が、同リング体１３の内周縁が筒状部２４ａの内周面より内方へ突出するように接着剤により接着されている。さらに、挿入体２４の中央部の外周面には同挿入体２４の径方向の外方へ延びる支持部２４ｃが突設されている。
【００３０】
そして、引抜ピン２３が取り付けられた引抜体２２において、引抜ピン２３の軸部が筒状部２４ａから挿通支持部２４ｂ内へ挿入され、さらに引抜体２２が筒状部２４ａ内に挿入されて拡径工具２１が形成されている。拡径工具２１は、リング体１３の内周面に引抜体２２の外周面が接触することにより同引抜体２２の挿入体２４内へのそれ以上の挿入が規制されているとともに、挿通支持部２４ｂから引抜ピン２３の軸部が突出している。
【００３１】
次に、前記拡径工具２１を使用してリング体１３を拡径して端部構造１０を備えた通水管１１を形成した後、その通水管１１と継手１２とを接続する方法について説明する。まず、図４に示すように、拡径工具２１の挿入体２４、引抜体２２及びリング体１３を管本体１１ａ内に挿入するとともに、支持部２４ｃに管本体１１ａの端面を当接させる。続いて、専用の引抜き工具等を使用し、引抜ピン２３を管本体１１ａから離れる方向へ引っ張ると、その引抜ピン２３の移動により頭部２３ａが係止した引抜体２２が筒状部２４ａ内奥方へ引っ張られる。
【００３２】
すると、引抜体２２は、同引抜体２２の左端側へ向かうに連れて外周面の外径が拡径しているため、引抜体２２が筒状部２４ａ内へ移動するに連れてリング体１３の内周面に接触する引抜体２２の外径は大きくなり、筒状部２４ａの内周側へ突出しているリング体１３は拡径されていく。
【００３３】
リング体１３の拡径状態において、リング体１３の内径と、リング体１３が装着されていない管本体１１ａの非拡径部分における内径とがほぼ同じ状態となる。また、リング体１３が拡径されることにより、図２に示すように、管本体１１ａの右端部はリング体１３により内側から外側へ押出される。最後に、挿入体２４が管本体１１ａ内から引抜かれる。
【００３４】
従って、管本体１１ａ内に残存したリング体１３により管本体１１ａの外周面に外方へ突出する接続用膨出部１１ｂが形成される。即ち、継手１２の接続筒部１４に設けられた係合スリーブ１９の係合凹条１９ｂが係合して管本体１１ａを接続筒部１４に抜け止めした状態に接続する接続用膨出部１１ｂが形成される。そして、接続用膨出部１１ｂが形成されるとともに、流量損失を小さくするための端部構造１０を備えた通水管１１が形成される。
【００３５】
さて、管本体１１ａの端部に接続用膨出部１１ｂが形成された通水管１１を継手１２に接続するため、まず、図２（ａ）に示すように、管本体１１ａの接続用膨出部１１ｂが形成された側の端部から固定スリーブ２０の内孔２０ａを通過させて管本体１１ａに固定スリーブ２０を装着する。このとき、固定スリーブ２０の内孔２０ａの直径は管本体１１ａの外径に前記リング体１３を形成する線材の直径の二倍の値を加えた値より大きく設定されている。そのため、内孔２０ａの直径より接続用膨出部１１ｂの外径が小さくなり、接続用膨出部１１ｂと内孔２０ａの周縁部とが係止することなく固定スリーブ２０が接続用膨出部１１ｂの外側を通過して管本体１１ａに装着される。
【００３６】
次いで、係合スリーブ１９を一対の分割体１９ａに分割した状態で接続用膨出部１１ｂの外周側に配置する。そして、接続用膨出部１１ｂが係合凹条１９ｂに係合するように一対の分割体１９ａを組付けて係合スリーブ１９を形成するとともに、図１に示すように、管本体１１ａに係合スリーブ１９を取付ける。次に、係合スリーブ１９が取り付けられた管本体１１ａの端部を継手本体１２ａの接続筒部１４内へ挿入する。
【００３７】
そして、前記固定スリーブ２０の雌ネジ２０ｂを継手本体１２ａの雄ネジ１５に螺合する。すると、固定スリーブ２０が継手本体１２ａに螺進されるに連れて、内孔２０ａ内に係合スリーブ１９の端部が挿入されていくとともに、係合スリーブ１９の縮径部１９ｃの外周面に内孔２０ａの内周面が徐々に圧接していき係合スリーブ１９が縮径される。それと同時に、係合スリーブ１９が接続筒部１４内奥方へ押圧され、その係合スリーブ１９の係合凹条１９ｂが係合している管本体１１ａも接続筒部１４内奥方へ押圧される。
【００３８】
その結果、管本体１１ａの右端面が第１当接面１６に当接されるとともに、係合スリーブ１９の右端面が第２当接面１８に当接される。また、継手本体１２ａに螺合して取り付けられた固定スリーブ２０の内部に係合スリーブ１９が保持されて固定スリーブ２０からの抜脱が防止される。さらに、内孔２０ａの内周面と管本体１１ａの外周面との間には係合スリーブ１９が介装されているため、内孔２０ａから突出した通水管１１が安定した状態で継手１２に保持される。そして、継手本体１２ａ、係合スリーブ１９及び固定スリーブ２０が組付けられて継手１２が形成される。
【００３９】
それと同時に、接続筒部１４に螺合された固定スリーブ２０内に保持された係合スリーブ１９の係合凹条１９ｂが接続用膨出部１１ｂに係合することにより、端部構造１０を備えた通水管１１が継手１２に抜け止めした状態に接続する接続構造が形成される。管本体１１ａが接続筒部１４に抜け止めされた状態で接続される。即ち、固定スリーブ２０により係合スリーブ１９の係合凹条１９ｂと接続用膨出部１１ｂとの係合を維持する状態で接続筒部１４に取り付けられる。さらに、管本体１１ａの外周面に一対のシール部材１７の内周面が密着して管本体１１ａの外周面と継手本体１２ａの内周面との間のシール性が維持される。
【００４０】
通水管１１と継手１２との接続状態において、リング体１３の内径と管本体１１ａの非拡径部分における内径とはほとんど同じに形成されている。そのため、管本体１１ａの端部と継手１２との接続部分において、リング体１３による通水管１１内を流通する流体の流量損失が小さくなる。
【００４１】
上記第１の実施形態によれば、以下のような特徴を得ることができる。
（１）管本体１１ａ内に挿入されたリング体１３を同リング体１３の内径が管本体１１ａの非拡径部分とほぼ同じとなるように内側から拡径した。そのため、継手の内挿筒部に管本体を外嵌するため、管本体の内径が内挿筒部の外径より大きくなるまで必要以上に拡径する必要があった従来と異なり、管本体１１ａを必要最小限に拡径して同管本体１１ａに作用する負荷を小さくすることができる。従って、前記負荷により管本体１１ａが損傷を受けたり、変形したりする不具合を防止することができるとともに、管本体１１ａの端部における流量損失を小さくすることができる。
【００４２】
（２）リング体１３はリング状をなすため、拡径工具２１を使用して容易に拡径することができ、接続用膨出部１１ｂを容易に形成することができる。
（３）リング体１３は金属材料製であるため、リング体１３により接続用膨出部１１ｂを形成した後、縮径、変形することなく接続用膨出部１１ｂを常に形成することができる。従って、接続用膨出部１１ｂと係合凹条１９ｂとの係合を維持して、通水管１１を継手１２に安定した状態で接続することができる。
【００４３】
（４）円環状をなすリング体１３を拡径して接続用膨出部１１ｂを形成するため、拡径治具を使用して管本体を直接的に拡径していた従来と異なり、管本体１１ａの端部をほぼ真円に近い状態に拡径することができる。従って、接続用膨出部１１ｂと固定スリーブ２０の左側の内周縁とを確実に係合させることができ、通水管１１と継手１２との接続を確実に維持することができる。
【００４４】
（５）係合スリーブ１９は一対の分割体１９ａを組付けることにより形成されるため、管本体１１ａに接続用膨出部１１ｂが形成された後に通水管１１に係合スリーブ１９を取り付けることができる。従って、通水管１１に係合スリーブ１９を取り付けた後、係合凹条１９ｂに接続用膨出部１１ｂが係合するようにリング体１３を拡径する必要がなく、係合スリーブ１９の通水管１１に対する取付作業、さらには通水管１１と継手１２との接続作業を速やかに行うことができる。
【００４５】
（６）固定スリーブ２０の内孔２０ａの直径より係合スリーブ１９の右端側の外径が大きく形成されているため、固定スリーブ２０内に係合スリーブ１９が保持される。そのため、管本体１１ａに取り付けられた係合スリーブ１９を継手本体１２ａに螺合接続された固定スリーブ２０により位置決めすることができ、継手１２から通水管１１が抜け出る不具合を防止することができる。
【００４６】
（７）固定スリーブ２０の内孔２０ａの直径は管本体１１ａの外径に前記リング体１３を形成する金属材の直径の二倍の値を加えた値より大きく設定されている。そのため、接続用膨出部１１ｂに内孔２０ａの周縁部が係止することなく、管本体１１ａに固定スリーブ２０を速やかに装着することができ、通水管１１と継手１２との接続作業を速やかに行うことができる。
【００４７】
（８）以下のような管本体１１ａの拡径用の工具を使用する場合に発生する不具合の発生を防止することができる。前記拡径用の工具は、４つの分割体の集合体を備え、前記集合体が管本体１１ａ内に挿入されて拡径作業が行われる。即ち、前記集合体の挿入状態で、集合体の中心に棒材が挿入されると、４つの分割体が外方へ押し出され、集合体全体が押し広げられることにより管本体１１ａの端部が各分割体によって直接的に拡径される。そのため、各分割体と対応する管本体１１ａの内周面は外方へ押し出されるが、分割体同士の隙間と対応する位置は拡径されない。その結果、拡径後の管本体１１ａの端部には、拡径部位と非拡径部位とが形成されて管本体１１ａが周方向に均一に拡径されず、通水管１１を継手１２に接続したとき、管本体１１ａの外周面にシール部材１７の内周面が密接しなくなり通水管１１と継手１２との間から流体が漏れ出る不具合が発生してしまう。これに対し、本実施形態では、拡径部２２ａによりリング体１３は周方向全体に均一に拡径されるため、管本体１１ａの端部は周方向全体へ均一に拡径され、さらにリング体１３と対応する部位しか拡径されない。従って、上記工具を使用した場合と異なり、シール部材１７の内周面にはほぼ真円状の管本体１１ａの外周面が確実に密接して通水管１１と継手１２との間から流体が漏れ出る不具合の発生を防止することができる。また、上記工具を使用して管本体１１ａを直接的に拡径する場合のように、拡径治具の外面等によって管本体１１ａの内面が損傷を受ける不具合の発生も防止することができる。
【００４８】
（第２の実施形態）
以下、本発明を具体化した通水管の端部構造、端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法の第２の実施形態を図５〜図９に従って説明する。なお、第２の実施形態の以下の説明における上下左右は、図５における上下左右に対応する。
【００４９】
図５に示すように、通水管１１の端部構造１０は、合成樹脂材料製の管本体１１ａの端部に形成され、管本体１１ａの端部における流量損失を小さくするために形成されるものである。そして、接続体としての継手２５に接続された通水管１１の端部における流量損失を小さくすることができる。
【００５０】
具体的に、前記通水管１１の端部構造１０は、前記管本体１１ａの右端部の内側に金属材料製のインナー体としての筒体２６が挿入され、同筒体２６が内側から拡径されて当該筒体２６の内径と管本体１１ａの非拡径部分の内径とがほぼ同一に形成されて構成されている。図６に示すように、前記筒体２６は金属材料により円筒状に形成され、拡径前の筒体２６の外径は、拡径前の管本体１１ａの内径よりわずかに小さく形成されている。
【００５１】
図５に示すように、前記継手２５は合成樹脂材料又は金属材料製の継手本体２７及び抜脱防止スリーブ２８により形成されている。この第２の実施形態では、前記継手本体２７及び抜脱防止スリーブ２８を合成樹脂材料により形成した。前記継手本体２７は略円筒状に形成されている。その継手本体２７の左端には管本体１１ａを接続するための接続筒部２７ａが形成され、右端は管体（図示せず）に接続可能に形成されている。接続筒部２７ａの外周面には雄ネジ２７ｂが螺刻されている。また、継手本体２７の内部には円環状をなす第１当接面２７ｃが形成され、同第１当接面２７ｃにはゴム材料によりリング状に形成されたシール部材１７が装着されている。前記シール部材１７より継手本体２７の左端側の内周面には、円環状をなし、前記第１当接面２７ｃより内径及び外径が大きい第２当接面２７ｄが形成されている。
【００５２】
図６に示すように、前記接続筒部２７ａに螺合されて取り付けられる接続手段を形成する抜脱防止スリーブ２８は略円筒状をなし、図５に示すように、抜脱防止スリーブ２８の左端部は同抜脱防止スリーブ２８の左端に向かうに連れて内径及び外径が縮径するように形成されている。抜脱防止スリーブ２８の左端には管本体１１ａの外径よりわずかに大きい直径を有する内孔２８ａが形成されている。また、抜脱防止スリーブ２８の右側の内周面には前記雄ネジ２７ｂに螺合可能な雌ネジ２８ｂが螺刻されている。
【００５３】
次に、図７に示す前記筒体２６を拡径する金属材料製の拡径治具３０について説明する。なお、拡径治具３０の以下の説明における上下左右は、図７における上下左右に対応する。図７及び図８に示すように、拡径治具３０は略円筒状に形成されたメインスリーブ３１を備え、そのメインスリーブ３１の左端側には円盤状をなすスリーブキャップ３２が螺着され、図８に示すように、スリーブキャップ３２の中央部には円孔３２ａが形成されている。メインスリーブ３１内にはボルト状をなす可動ボルト３３が、同可動ボルト３３の頭部側が前記スリーブキャップ３２側を向くように挿入されている。
【００５４】
この可動ボルト３３の頭部側端面の中央部には、メインスリーブ３１内への挿入状態で前記円孔３２ａと対応するように雌ネジ孔３３ａが形成されている。また、可動ボルト３３の頭部の外側面には、可動ボルト３３の軸線に沿って延びる係合溝３３ｂが形成され、可動ボルト３３の軸部の外周面には雄ネジ３３ｃが形成されている。
【００５５】
そして、メインスリーブ３１内に挿入された可動ボルト３３の軸部がメインスリーブ３１の右端側から突出した状態で、スペーサ３４を介装して雄ネジ３３ｃにナット３５が螺合されて、メインスリーブ３１に可動ボルト３３が取り付けられている。メインスリーブ３１に可動ボルト３３が取り付けられた状態で、メインスリーブ３１の外面から可動ボルト３３の係合溝３３ｂに係合ピン３８が係合するように取り付けられ、その係合ピン３８の係合溝３３ｂに対する係合により可動ボルト３３のメインスリーブ３１内での回転が規制されている。
【００５６】
メインスリーブ３１内の可動ボルト３３の雌ネジ孔３３ａには拡径シャフト３６の右端側に形成された雄ネジ３６ａが螺合されて可動ボルト３３に拡径シャフト３６が取り付けられている。この拡径シャフト３６の左側は、同左側に向かうに連れて徐々に直径が拡径するように形成され、左端部には、一定の外径を有する拡径部３６ｂが形成されている。その拡径シャフト３６の拡径部３６ｂの直径は管本体１１ａの内径よりわずかに小さく形成され、筒体２６の内径よりわずかに大きく形成されている。
【００５７】
次に、上記拡径治具３０を使用して端部構造１０を備えた通水管１１を形成し、端部構造１０の接続用膨出部１１ｂを使用して通水管１１と継手２５とを接続する方法について説明する。まず、図６に示すように、管本体１１ａに抜脱防止スリーブ２８を装着しておく。次に、ナット３５を可動ボルト３３から螺退させ同可動ボルト３３を頭部側端面がメインスリーブ３１のスリーブキャップ３２側内面に当接するまで移動させる。次いで、図８に示すように、拡径シャフト３６に筒体２６を装着した状態で、その拡径シャフト３６の雄ネジ３６ａを雌ネジ孔３３ａに螺合して拡径シャフト３６を可動ボルト３３に取り付ける。
【００５８】
続いて、その筒体２６に管本体１１ａの端部を外嵌し、拡径シャフト３６に管本体１１ａを装着した状態で、ナット３５を可動ボルト３３に螺進させる。すると、図９に示すように、係合ピン３８と係合溝３３ｂとの係合により可動ボルト３３は回転しないため、係合ピン３８に係合溝３３ｂが沿うように可動ボルト３３はメインスリーブ３１の軸線に沿って同メインスリーブ３１内へ引き込まれていく。
【００５９】
その可動ボルト３３の移動と同時に、拡径シャフト３６がメインスリーブ３１内へ引き込まれていく。すると、筒体２６内に拡径シャフト３６の拡径部３６ａ分が徐々に挿入されていき、その拡径部３６ｂにより筒体２６が左側から右側に向かって徐々に外方へ押出されて拡径され、その拡径に伴い管本体１１ａも拡径される。このとき、管本体１１ａの内径よりわずかに小さい外径を有する拡径シャフト３６の拡径部３６ｂにより拡径された筒体２６の内周面と管本体１１ａの非拡径部分における内径とがほぼ同じになる。
【００６０】
管本体１１ａと筒体２６とが同時に拡径されることにより、筒体２６の外周面は管本体１１ａの端部の内周面に圧接し、管本体１１ａの端部と筒体２６との間に流体の漏れ出しを防止するシール構造が形成される。また、管本体１１ａの端部には拡径された筒体２６により管本体１１ａの外面に外方へ突出する接続用膨出部１１ｂが形成される。そして、管本体１１ａの端部に流量損失を小さくするための端部構造１０及び接続用膨出部１１ｂと備えた通水管１１が形成される。
【００６１】
さて、前記継手２５と通水管１１とを接続するには、まず、図５に示すように、管本体１１ａの接続用膨出部１１ｂが形成された側の端部を接続筒部２７ａ内に挿入し、管本体１１ａの右端面を第２当接面２７ｄに当接させるとともに、筒体２６の右端面をシール部材１７に当接させる。続いて、抜脱防止スリーブ２８の雌ネジ２８ｂを雄ネジ２７ｂに螺合して抜脱防止スリーブ２８を継手本体２７に取付けることにより、継手２５が形成される。このとき、抜脱防止スリーブ２８の内孔２８ａの直径は管本体１１ａの非拡径部分における外径とほぼ同じに形成されているため、拡径により形成された接続用膨出部１１ｂの外径より小さくなっている。
【００６２】
そのため、継手本体２７に螺合して取り付けられた抜脱防止スリーブ２８の係合部としての左側の内周縁に接続用膨出部１１ｂが係合して抜脱防止スリーブ２８から管本体１１ａが抜け出ることが防止される。即ち、接続用膨出部１１ｂと抜脱防止スリーブ２８とにより通水管１１と継手１２との接続構造が形成され、通水管１１が継手２５に抜け止めされた状態で接続される。従って、抜脱防止スリーブ２８を継手本体２７に螺合し、継手２５を形成すると同時に、通水管１１を継手２５に接続することができ、通水管１１と継手２５との接続作業を容易に行うことができる。
【００６３】
通水管１１と継手２５との接続状態において、管本体１１ａの内周面と筒体２６の外周面との間のシール構造により、管本体１１ａの端部から通水管１１内を流通する流体の継手本体２７側への漏れ出しが防止される。さらに、シール部材１７により継手本体２７内へ流体が流入するのが防止される。また、筒体２６の内径と管本体１１ａの非拡径部分における内径はほぼ同じに形成されているため、筒体２６による管本体１１ａ内を流通する流体の流量損失を小さくすることができる。
【００６４】
なお、前記各実施形態は以下のように変更してもよい。
・ 図１０に示す接続体としての継手４０と端部構造１０を備えた通水管１１とを接続してもよい。以下の説明における上下左右は、図１０における上下左右に対応する。図１０に示すように、通水管１１の右端部には第２の実施形態と同様に筒体２６が内径が非拡径部分の管本体１１ａの内径と同一となるように拡径され、さらに接続用膨出部１１ｂが形成されて端部構造１０が形成されている。
【００６５】
次に、接続体としての継手４０について説明する。この継手４０は通水管１１同士を接続するために使用され、合成樹脂材料又は金属材料により略筒状に形成された継手本体４１、その継手本体４１に取り付けられたピン体４２及び割リング４３より主に形成されている。なお、この場合は前記継手本体４１、ピン体４２及び割リング４３を合成樹脂材料により形成した。継手本体４１の両端（図１０では左端のみ図示）にはそれぞれ接続筒部４１ａが形成され、各接続筒部４１ａの端面近傍の外面にはそれぞれ突出部４１ｂが形成されている。図１１に示すように、各突出部４１ｂにはそれぞれ略Ｕ字状に形成されたピン体４２が取り付けられ、このピン体４２は接続手段を形成する取着体として設けられている。さらに、ピン体４２はその両端側が突出部４１ｂから離れる方向へ延びるように突出部４１ｂに取り付けられている。そして、ピン体４２はそれぞれ突出部４１ｂに取り付けられた部分を回動中心として回動可能に取り付けられている。
【００６６】
各接続筒部４１ａの端面において、前記突出部４１ｂとほぼ対向する位置には、それぞれ継手本体４１の軸線に沿って接続筒部４１ａの端面から外方へ突出する一対の係合突部４１ｃが突設されている。各係合突部４１ｃの内側面にはそれぞれ前記ピン体４２が係合可能な係合凹所４１ｄが凹設されている。
【００６７】
そして、ピン体４２を係合突部４１ｃ側へ回動させ、さらにピン体４２を係合凹所４１ｄに係合させることにより、ピン体４２を回動不能に配置することができる。このとき、図１２に示すように、ピン体４２は接続筒部４１ａの開口を横断する状態で配置されるようになっている。図１０に示すように、継手本体４１内の内周面には、同継手本体４１の周方向に沿って延びる係止突条４１ｅが形成されている。
【００６８】
図１１に示すように、接続筒部４１ａに設けられ、接続手段を形成する係合体としての割リング４３は筒状体が軸線方向に沿って切り欠かれて断面Ｃ字状に形成されている。そして、図１０に示すように、接続筒部４１ａ内に挿入されたとき、接続筒部４１ａの内周面により縮径されるように形成されている。また、割リング４３は接続筒部４１ａ内に挿入された状態において、割リング４３の右端面が係合部として接続用膨出部１１ｂに係合するように形成されている。
【００６９】
さて、上記構成の継手４０と通水管１１とを接続するには、まず、第２実施形態と同様の方法により筒体２６を使用して端部構造１０を備えた通水管１１を形成する。次に、管本体１１ａの接続用膨出部１１ｂが形成された側の端部に割リング４３及びシール部材１７を装着する。そして、ピン体４２を回動させて接続筒部４１ａの開口を開放した状態で、管本体１１ａの接続用膨出部１１ｂが形成された側を接続筒部４１ａ内に挿入する。さらに、シール部材１７及び割リング４３を接続筒部４１ａ内に挿入した状態でピン体４２の両端が係合突部４１ｃに近づくように回動させる。
【００７０】
すると、ピン体４２が割リング４３の左端面に当接し、そのピン体４２により割リング４３は接続筒部４１ａ内奥方へ押圧され、その割リング４３によりシール部材１７が接続筒部４１ａ内奥方へ移動される。このとき、接続筒部４１ａの内周面により割リング４３が縮径されて、割リング４３は管本体１１ａの外周面に圧着する。
【００７１】
また、割リング４３の右端面が接続用膨出部１１ｂに係合し、その係合状態で割リング４３が接続筒部４１ａ内奥方へ押し込まれることにより管本体１１ａが接続筒部４１ａ内奥方へ送り込まれる。そして、ピン体４２が係合凹所４１ｄに係合されると継手４０が形成される。それと同時に、接続筒部４１ａ内の係止突条４１ｅに管本体１１ａの端面が係止して管本体１１ａの継手本体４１内奥方へのそれ以上の移動が規制される。加えて、シール部材１７が管本体１１ａの外周面に圧接して継手本体４１と通水管１１との間のシール性が維持される。
【００７２】
ピン体４２が係合凹所４１ｄに係合した状態において、図１２に示すように、ピン体４２は接続筒部４１ａの開口を横断している。そのため、そのピン体４２により接続用膨出部１１ｂに係合した割リング４３が接続筒部４１ａ内から抜け出るのが防止され、ピン体４２により割リング４３と接続用膨出部１１ｂとの係合が維持される。従って、管本体１１ａと割リング４３との係合により端部構造１０を備えた通水管１１を継手４０に抜け止めした状態で接続するための接続構造が形成され、接続筒部４１ａ、即ち継手４０から通水管１１が抜け出るのが防止されて通水管１１と継手４０とが接続される。
【００７３】
その結果、ピン体４２と係合凹所４１ｄとの係合により、接続用膨出部１１ｂに係合した割リング４３の接続筒部４１ａからの抜け出しを防止して、接続筒部４１ａからの管本体１１ａの抜け出しを防止することができる。第２の実施形態にように、継手本体２７に抜脱防止スリーブ２８を螺合した場合と比較して、通水管１１を継手４０に抜け止めした状態に接続する作業を容易に行うことができる。
【００７４】
・ 第２実施形態において、図１３に示すインナー体としての筒体２６を管本体１１ａに取り付けて通水管１１の端部構造１０を形成してもよい。筒体２６は同筒体２６の右端側に、外方へ拡径しながら延びる延設部２６ａが形成されている。また、継手本体２７の接続筒部２７ａの左端面は継手本体２７の中央部側へ向かうに連れて拡径するようにテーパ状に形成されている。さらに、抜脱防止スリーブ２８の中央部の内周面が抜脱防止スリーブ２８の周方向に沿って延びる係止段部２８ｃが形成されるように、抜脱防止スリーブ２８の右端側を拡径する。
【００７５】
そして、管本体１１ａの内側に挿入された筒体２６が内径が管本体１１ａの非拡径部分の内径とほぼ同一となるように拡径されるとともに、管本体１１ａの外面に接続用膨出部１１ｂを形成して端部構造１０を備えた通水管１１を形成する。このときも、筒体２６の外周面が管本体１１ａの内周面に圧接して、管本体１１ａの端部と筒体２６との間にシール構造が形成されている。そのため、通水管１１内を流通する流体が、管本体１１ａ内周面と筒体２６の外周面との間から継手本体２７と抜脱防止スリーブ２８との間へ漏れ出る不具合を防止することができる。さらに、延設部２６ａの内周面を継手本体２７の端面に当接させ、その当接状態で抜脱防止スリーブ２８を継手本体２７に螺合する。
【００７６】
その結果、継手本体２７の左端面と抜脱防止スリーブ２８の係止段部２８ｃとの間に延設部２６ａが挟持されるとともに、抜脱防止スリーブ２８の内面に接続用膨出部１１ｂが係合する。従って、継手本体２７に取り付けられた抜脱防止スリーブ２８から管本体１１ａが抜け出ることが防止される。即ち、通水管１１が継手２５に抜け止めされた状態で接続される。なお、端部構造１０が予め形成された通水管１１を施工現場に搬入し、施工現場で通水管１１と継手２５とを接続してもよい。
【００７７】
・ 図１４に示すインナー体としての接続部材５４を管本体１１ａに取り付け、同接続部材５４を内側から拡径して当該接続部材５４の内径と管本体１１ａの非拡径部分の内径とをほぼ同一に形成して、端部構造１０を備えた通水管１１を形成してもよい。前記接続部材５４は金属材料により略円筒状に形成されている。接続部材５４の一端の外周縁には接続部材５４の周方向に沿って外方へ突出する接続鍔部５４ｂが延設部及び固定部として形成され、その接続鍔部５４ｂにはボルト５５を挿通可能な挿通孔５４ｃが２箇所に形成されている。
【００７８】
さて、接続部材５４が管本体１１ａの右端部の内側に挿入された状態で、接続部材５４の内径と管本体１１ａの非拡径部分の内径とがほぼ同一となるように接続部材５４及び管本体１１ａを拡径すると、端部構造１０を備えた通水管１１が形成される。このときも、接続部材５４の外周面が管本体１１ａの内周面に圧接して、接続部材５４と管本体１１ａとの間にシール構造が形成される。その結果、接続部材５４の外周面と管本体１１ａの内周面との間から通水管１１内を流通する流体が漏れ出る不具合を防止することができる。
【００７９】
上記通水管１１を接続体として接続部材５４を備えた別の通水管１１に接続するには、各接続部材５４の挿通孔５４ｃにボルト５５を挿通し、各ボルト５５にナット５６を螺合して接続部材５４同士を接続固定する。その結果、通水管１１同士を接続することができる。なお、端部構造１０が予め形成された通水管１１を施工現場に搬入し、施工現場で通水管１１同士を接続してもよい。
【００８０】
・ 図１５に示す端部形成部材６０を使用して通水管１１に端部構造１０を形成し、さらに、端部構造１０を備えた通水管１１と接続体とを接続してもよい。なお、通水管１１及び端部形成部材６０の上下左右は図１５における上下左右に対応する。前記端部形成部材６０は略円筒状をなし、端部形成部材６０の左側には、円環状をなすインナー体としてのインナー部６０ａと、同インナー部６０ａの外側に位置する円環状をなすアウター体としてのアウター部６０ｂとが形成されている。
【００８１】
そして、端部形成部材６０の左側には前記インナー部６０ａとアウター部６０ｂとの間に、円環状をなす環状溝６０ｃが形成され、その環状溝６０ｃに、管本体１１ａの端部が挿入可能に形成されている。即ち、インナー部６０ａの内径は管本体１１ａの内径より小さく形成され、環状溝６０ｃ内に管本体１１ａが挿入されたとき、インナー部６０ａは管本体１１ａの内側に挿入され、アウター部６０ｂは管本体１１ａの外側に配置されるように形成されている。前記環状溝６０ｃの内周面と、同環状溝６０ｃ内に挿入された管本体１１ａの外周面との間に嵌入される合成樹脂製の介装部材６４は略円筒状をなす筒状体が軸線方向に沿って切り欠かれて断面Ｃ字状に形成されている。
【００８２】
端部形成部材６０の右側には、インナー部６０ａ及びアウター部６０ｂから延びる延出部６０ｄが固定部として形成されている。延出部６０ｄの外周面には、２箇所にシール部材１７が装着され、延出部６０ｄの内径は管本体１１ａの内径とほぼ同じに形成されている。図１６に示すように、端部形成部材６０と接続される接続体としての継手６２は、合成樹脂材料又は金属材料により略円筒状に形成され、その左側に接続筒部６２ａが形成されている。
【００８３】
さて、前記端部形成部材６０を使用して管本体１１ａの端部における流量損失を小さくする端部構造１０を備えた通水管１１を形成するには、まず、図１５に示すように、管本体１１ａに前記介装部材６４を装着する。さらに、端部形成部材６０のインナー部６０ａを拡径するための拡径部材６１を管本体１１ａ内に挿入する。なお、前記拡径部材６１は左端部に直径が管本体１１ａの内径とほぼ同じに形成された膨出部６１ａを備え、その膨出部６１ａから直線上に延びる把持部６１ｂを備えている。
【００８４】
そして、前記膨出部６１ａを管本体１１ａ内に挿入する。その後、管本体１１ａの端部が端部形成部材６０の環状溝６０ｃ内に挿入され、インナー部６０ａが管本体１１ａの内側に挿入されるとともに、アウター部６０ｂが管本体１１ａの外側に配置されるように端部形成部材６０を管本体１１ａに装着する。さらに、環状溝６０ｃの内周面と管本体１１ａの外周面との間に介装部材６４を嵌入し、続いて、前記把持部６１ｂを手や専用の引抜き工具等で把持して管本体１１ａから離れる方向へ引っ張り、膨出部６１ａをインナー部６０ａ内を通過させる。
【００８５】
すると、管本体１１ａの内径とほぼ同じ直径を有する膨出部６１ａによりインナー部６０ａ、管本体１１ａ、介装部材６４及びアウター部６０ｂが拡径されるとともに、インナー部６０ａの内径と管本体１１ａの非拡径部分における内径とがほぼ同一に形成される。それと同時に、インナー部６０ａの外周面と管本体１１ａの内周面との間に流体の漏れ出しを防止するシール構造が形成される。
【００８６】
その結果、端部構造１０を備えた通水管１１が形成される。また、合成樹脂製の介装部材６４の拡径状態からの収縮に伴う縮径と、環状溝６０ｃ内への嵌入による管本体１１ａの外周面に対する押圧により管本体１１ａが環状溝６０ｃ内からの抜け出しが規制される。インナー部６０ａの管本体１１ａ内への挿入状態において、延出部６０ｄは管本体１１ａの端面から延出している。端部構造１０が形成された通水管１１を継手６２に接続するには、延出部６０ｄを継手６２の接続筒部６２ａ内へ嵌入する。すると、一対のシール部材１７が接続筒部６２ａの内周面に圧接し、さらに、シール部材１７自身の弾性力により接続筒部６２ａの内周面を外方へ押圧する。そのため、端部形成部材６０が延出部６０ｄにより接続筒部６２ａに接続され、継手６２と通水管１１とが接続される。
【００８７】
従って、端部形成部材６０を使用することにより、継手６２に対して通水管１１を容易に接続することができ、その接続状態で管本体１１ａの端部における流量損失を小さくすることができる。また、前記シール構造により管本体１１ａの端部と環状溝６０ｃとの間から流体が漏れ出るおそれをなくすことができる。なお、通水管１１に端部形成部材６０が接続されて端部構造１０が形成され、端部構造１０を備えた通水管１１を施工現場に搬入して、継手６２と通水管１１とを接続してもよい。また、前記介装部材６４は省略してもよく、その場合には、環状溝６０ｃ内に管本体１１ａのみが嵌入されるように環状溝６０ｃの大きさが調整される。さらに、介装部材６４の代わりに管本体１１ａの外周面と環状溝６０ｃの内周面との間にコイルスプリングやバネ部材等の弾性部材を介装してもよい。このように構成した場合、弾性部材が管本体１１ａの外周面と環状溝６０ｃの内周面との両面をそれぞれ押圧して環状溝６０ｃからの通水管１１の抜け出しを規制することができる。なお、端部構造１０が予め形成された通水管１１を施工現場に搬入し、施工現場で通水管１１と継手６２とを接続してもよい。
【００８８】
・ 図１７に示す接続体としての継手７０と、第１の実施形態のリング体１３を用いて端部構造１０が形成された通水管１１と、を接続してもよい。前記継手７０について説明するが、以下の説明における上下左右は図１７における上下左右に対応する。前記継手７０は通水管１１同士を接続するために使用されるもの又は分岐継手（ヘッダー）の一部として使用されるものであり、略筒状に形成された継手本体７１、固定スリーブ７２、Ｃリング７３及びリング部材７４より主に形成されている。
【００８９】
合成樹脂材料により略円筒状に形成された前記継手本体７１の両端（図１７では左端のみ図示）には、それぞれ接続筒部７５が形成されている。各接続筒部７５の奥方の内周面には第１載置面７６が形成され、その第１載置面７６より継手本体７１の左側に位置する接続筒部７５の内周面には、前記第１載置面７６より内径及び外径の大きい第２載置面７７が形成されている。前記第１載置面７６及び第２載置面７７には、それぞれゴム材料製のＯ−リング７８が配設されている。
【００９０】
前記第２載置面７７より継手本体７１の左側に位置する接続筒部７５の内周面には、前記第２載置面７７より内径及び外径の大きい当接面７９が形成されている。また、接続筒部７５の外周面には雄ネジ８０が螺刻されている。前記固定スリーブ７２は接続手段を形成する取着体として設けられている。そして、固定スリーブ７２は、合成樹脂材料により略円筒状に形成され、固定スリーブ７２の右側内周面には、前記雄ネジ８０に螺合可能な雌ネジ７２ａが螺刻されている。また、固定スリーブ７２の内周面には内方へ突出する係止面７２ｂが形成されている。加えて、前記係止面７２ｂの内周縁に繋がる固定スリーブ７２の内周面には、係止面７２ｂ側から、固定スリーブ７２の左端に向かうに連れて縮径するテーパ面７２ｃが形成されている。さらに、固定スリーブ７２の左端の内周縁には、係止リブ７２ｄが内方へ向かって突設されている。
【００９１】
前記Ｃリング７３は接続手段を形成する係合体として設けられ、Ｃリング７３の右端面が接続用膨出部１１ｂに係合する係合部として形成されている。このＣリング７３は合成樹脂材料製の筒状体が軸線方向に沿って切り欠かれて断面Ｃ字状に形成されている。このＣリング７３は右端から左端に向かうに連れて外径が縮径するテーパ状に形成されている。また、Ｃリング７３は接続筒部７５内に挿入された状態において、右端面が係合部として接続用膨出部１１ｂに係合するように形成されている。前記リング部材７４は金属材料により円環状に形成され、継手本体７１に固定スリーブ７２が螺合された状態で、右端が前記当接面７９に当接し、左端が前記係止面７２ｂに係止されて当接面７９と係止面７２ｂとの間に保持されるようになっている。
【００９２】
リング部材７４が、当接面７９と係止面７２ｂとの間に保持された状態では、同リング部材７４の内周縁部と、前記第２載置面７７との間にＯ−リング７８が保持されるようになっている。そして、Ｏ−リング７８を第１及び第２載置面７６，７７に載置し、当接面７９にリング部材７４を載置した状態で、Ｃリング７３が内部に収容された固定スリーブ７２を継手本体７１に螺着すると、継手７０が組み付けられる。このとき、Ｃリング７３の左端面は固定スリーブ７２の係止リブ７２ｄに係止され、固定スリーブ７２内からのＣリング７３の抜け出しが防止されている。
【００９３】
さて、接続用膨出部１１ｂが形成された通水管１１と、上記継手７０とを接続するには、まず、固定スリーブ７２を継手本体７１から若干螺退させ、テーパ面７２ｃとＣリング７３の外周面との間に間隙を形成し、Ｃリング７３を拡径可能な状態としておく。そして、管本体１１ａの接続用膨出部１１ｂ側を固定スリーブ７２内を通過させて接続筒部７５内に挿入する。すると、管本体１１ａの端面がＣリング７３の内周面に当接し、さらに、Ｃリング７３内に管本体１１ａが挿入されてそのＣリング７３が拡径されるとともに、接続用膨出部１１ｂのＣリング７３内の通過が許容される。
【００９４】
そして、管本体１１ａの端面が第１載置面７６に載置されたＯ−リング７８に当接するまで、通水管１１を継手７０内に挿入する。このとき、接続用膨出部１１ｂはＣリング７３の右端面より継手本体７１内奥側に位置し、リング部材７４と対応する位置に配設されている。続いて、固定スリーブ７２を接続筒部７５に螺進させると、テーパ面７２ｃがＣリング７３の外周面に圧接していき、Ｃリング７３が徐々に縮径されていく。固定スリーブ７２が接続筒部７５に螺合されると、Ｃリング７３の内面が管本体１１ａの外周面に圧接するとともに、Ｃリング７３の右端面が接続用膨出部１１ｂに係合可能な位置に配置される。また、第１載置面７６に載置されたＯ−リング７８が管本体１１ａの端面に圧接し、第２載置面７７に載置されたＯ−リング７８が管本体１１ａの外周面に圧接する。
【００９５】
その結果、接続用膨出部１１ｂが、Ｃリング７３に係合し、そのＣリング７３が固定スリーブ７２内から抜け出し不能に収容される。そのため、接続用膨出部１１ｂがＣリング７３に係合した状態が維持され、管本体１１ａが接続筒部７５に抜け止めされ、通水管１１の継手７０からの抜け出しを防止することができる。
【００９６】
加えて、Ｃリング７３を継手７０内に収容することにより、継手７０を形成する各部材を組み付けた状態で通水管１１の接続作業を行うことができる。従って、例えば固定スリーブ７２、Ｃリング７３及びリング部材７４をそれぞれ通水管１１に装着した後、それらを組み付けて継手７０を形成し、通水管１１と接続する場合と比較して、通水管１１と継手７０の接続作業の簡易化を図ることができる。
【００９７】
なお、上記では、継手本体７１、固定スリーブ７２、Ｃリング７３及びリング部材７４を組み付けた状態で、通水管１１の接続作業を行ったが、以下のような接続作業としてもよい。即ち、接続用膨出部１１ｂが形成された通水管１１に固定スリーブ７２及びＣリング７３を予め装着した状態で、リング部材７４が収容された接続筒部７５内に接続用膨出部１１ｂ側を挿入する。そして、固定スリーブ７２を接続筒部７５に螺合して継手７０を形成し、通水管１１を継手７０に接続してもよい。また、前記継手７０は、継手本体７１及び固定スリーブ７２を金属材料により形成し、さらにリング部材７４を継手本体７１に一体形成してもよい。なお、Ｃリング７３は合成樹脂材料により成形する。
【００９８】
・ 各実施形態では、通水管１１を合成樹脂材料のみによって形成したが、合成樹脂材料製の通水管１１として、管本体１１ａの厚み内に金属層を設けてもよい。このように構成した場合、金属層により酸素が通水管１１を通過するのを防止することができる。そのため、通水管１１内を流通する水等の流体に酸素が含有され、その酸素により金属製の接続体が錆びてしまうといった不具合の発生を防止することができる。
【００９９】
・ 拡径治具３０において、メインスリーブ３１の内周形状を断面八角形状又は断面六角形状に形成し、可動ボルト３３の頭部を断面八角形状又は断面六角形状に形成してもよい。このように構成した場合、ナット３５を雄ネジ３３ｃに螺進又は螺退させたとき、可動ボルト３３の頭部とメインスリーブ３１の内周面とが干渉して、可動ボルト３３をメインスリーブ３１内で回転させることなく移動させることができる。従って、可動ボルト３３の回転を規制するための係合溝３３ｂと、係合ピン３８とを省略することができる。
【０１００】
・ 各実施形態において、インナー体として線材を環状に巻回して形成されたリング部材を使用してもよい。このように構成した場合、インナー体を容易かつ安価に形成することができる。
【０１０１】
・ 各実施形態では通水管１１の一端部に端部構造１０を形成したが、通水管１１の両端側に端部構造１０を形成してもよい。
・ 各実施形態では、接続体と通水管１１との接続現場で通水管１１を拡径して端部構造１０を形成したが、管本体１１ａを予め拡径して端部構造１０が形成された通水管１１を工場等で予め形成してもよい。そして、接続体と通水管１１との接続現場で、端部構造１０が予め形成された通水管１１と接続体とを接続してもよい。このとき、通水管１１の外面を保護するさや管等内に通水管１１を挿入した後、通水管１１と接続体とを即座に接続することができる。従って、管本体の端部に固定リングを外嵌するために、管本体に固定リングを装着し、その固定リング及び通水管をさや管内を通過させた後に、通水管と接続体とを接続する必要があった従来と異なり、通水管１１と接続体との接続作業を容易に行うことができる。
【０１０２】
・ 第１の実施形態において、拡径工具２１を使用してリング体１３を拡径したが、拡径工具２１を使用してリング体１３の代わりに筒体２６を拡径してもよい。
【０１０３】
・ 各実施形態では、インナー体を拡径するとともに、管本体１１ａに接続用膨出部１１ｂを形成し、その接続用膨出部１１ｂを使用して通水管１１と接続体とを接続したが、接続用膨出部１１ｂを使用せずに別の接続手段により端部構造１０を備えた通水管１１と接続体とを接続してもよい。
【０１０４】
・ 端部構造１０を備えた通水管１１を接続体としての分岐継手、水栓器具等に接続してもよい。
・ 各実施形態で使用された拡径工具２１、拡径治具３０の他の工具を使用してインナー体を拡径してもよい。
【０１０５】
次に上記実施形態及び別例から把握できる技術的思想について、それらの効果とともに以下に追記する。
（１）前記インナー体の拡径により管本体の外面から外方へ突出し、前記接続体の接続筒部に設けられた接続手段の係合部が係合して管本体を接続筒部に抜け止めした状態に接続する接続用膨出部が形成されていることを特徴とする請求項１５に記載の通水管の端部構造の形成方法。このように構成した場合、管本体と接続体との接続を容易に行うことができる。
【０１０６】
（２）請求項６に記載の端部構造を備えた通水管を、接続体に抜け止めした状態で接続するために形成される通水管と接続体との接続構造であって、前記管本体に挿入された筒体の延出部を、接続筒部内に嵌入して形成されていることを特徴とする端部構造を備えた通水管と接続体との接続構造。このように構成した場合、管本体と接続筒部との接続作業を容易に行うことができる。
【０１０７】
【発明の効果】
以上、詳述したように、請求項１〜請求項７のいずれか一項に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えるとともに、管本体と接続体との接続状態において、管本体の端部における流量損失を小さくすることができる。
【０１０８】
請求項８〜請求項１４のいずれか一項に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えるとともに、管本体と接続体との接続状態において、管本体の端部における流量損失を小さくすることができる端部構造を備えた通水管と、接続体とを接続することができる。また、管本体と接続筒部との接続を容易に行うことができる。
【０１０９】
請求項１５に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えるとともに、管本体と接続体との接続状態において、管本体の端部における流量損失を小さくすることができる端部構造を形成することができる。
【図面の簡単な説明】
【図１】第１の実施形態の通水管と継手との接続構造を示す部分側断面図。
【図２】（ａ）は第１の実施形態の通水管と継手とを示す分解斜視図、（ｂ）は係合スリーブを分割体に分割した状態を示す正面図。
【図３】（ａ）は拡径工具を示す斜視図、（ｂ）は拡径工具を示す側断面図。
【図４】管本体内に拡径工具を挿入した状態を示す側断面図。
【図５】第２の実施形態の通水管と継手との接続構造を示す部分側断面図。
【図６】第２の実施形態の通水管と継手とを示す分解斜視図。
【図７】拡径治具を示す斜視図。
【図８】拡径シャフトに筒体及び管本体を装着した状態を示す側断面図。
【図９】拡径治具により管本体を拡径した状態を示す側断面図。
【図１０】第３の実施形態の通水管と継手との接続構造を示す側断面図。
【図１１】第３の実施形態の通水管と継手とを示す分解斜視図。
【図１２】継手本体と通水管との接続状態を示す正面図。
【図１３】別例の継手と通水管との接続構造を示す側断面図。
【図１４】別例のインナー体の接続部材と通水管とを示す側断面図。
【図１５】別例のインナー体を通水管に接続した状態を示す側断面図。
【図１６】別例の継手と通水管との接続構造を示す部分側断面図。
【図１７】別例の継手と通水管との接続構造を示す部分側断面図。
【図１８】従来の通水管と継手との接続構造を示す部分側断面図。
【符号の説明】
１０…端部構造、１１…通水管、１１ａ…管本体、１１ｂ…接続用膨出部、１２，２５，４０，６２，７０…接続体としての継手、１３…インナー体としてのリング体、１４，２７ａ，４１ａ，６２ａ，７５…接続筒部、１９…係合体としての係合スリーブ、１９ａ…分割体、１９ｂ…係合部としての係合凹条、２０，７２…取着体としての固定スリーブ、２６…インナー体としての筒体、２６ａ…固定部としての延設部、２８…抜脱防止スリーブ、４２…取着体としてのピン体、４３…係合体としての割リング、５４…インナー体としての接続部材、５４ｂ…固定部としての接続鍔部、６０ａ…インナー体としてのインナー部、６０ｄ…固定部としての延出部、７３…係合体としてのＣリング。[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention can reduce the flow loss of fluid at the end of the pipe body of a synthetic resin material water pipe that is connected to a connector such as a joint or a branch joint and is used as a water supply pipe. The present invention relates to an end structure of a water pipe that can reduce a load acting on the water pipe in a connection operation between the water pipe and a connector. The present invention also relates to a water pipe having the end structure, a connection structure between the water pipe and a connector, and a method of forming an end structure of the water pipe.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a connection body such as a joint, for example, and a water pipe made of a synthetic resin material used as a water supply pipe are connected so as to reduce a flow loss of a fluid at a connection portion between the two (for example, see Patent Document 1). 1). For example, as shown in FIG. 18, the water pipe 101 includes a pipe main body 101a, and the joint 102 to which the pipe main body 101a is connected is formed in a substantially cylindrical shape with a metal material. At one end of the joint 102, a connecting tubular portion 103 as an inner body inserted into the water pipe 101 is protruded, and at the other end, a pipe (not shown) is formed so as to be connectable. . On the outer peripheral surface of the connecting tube 103, a plurality of protrusions 103a projecting outward along the circumferential direction of the connecting tube 103 are formed at a plurality of locations at regular intervals.
[0003]
In order to connect the water pipe 101 to the joint 102, first, in the connection state of the water pipe 101 and the joint 102, the inner diameter of the pipe main body 101a and the inner diameter of the connection cylinder 103 are made substantially the same. In order to reduce the flow loss of the fluid, the end of the pipe main body 101a is expanded using a diameter expanding jig (not shown). Then, before the expanded end of the pipe main body 101a returns to its original state due to its own contraction force, the expanded diameter portion of the pipe main body 101a is attached to the outer peripheral surface of the connection tube 103. Then, the diameter of the tube main body 101a is reduced by the contraction, and the inner peripheral surface of the tube main body 101a is pressed against the outer peripheral surface of the connection tubular portion 103. Further, a fixing ring 104 formed in a ring shape from a synthetic resin material is fitted around the end of the expanded tube body 101a.
[0004]
Then, the end of the tube main body 101a is tightened from the outer peripheral side by the diameter reduction due to the contraction of the fixing ring 104, and the end of the tube main body 101a is sandwiched between the fixing ring 104 and the connection tube 103. As a result, the ridge 103a bites into the inner peripheral surface of the pipe main body 101a, and the pipe main body 101a is prevented from falling off by the connection tube 103, and the water pipe 101 is connected to the joint 102 in a state where it is prevented from falling off.
[0005]
[Patent Document 1]
JP 2000-2384 A
[0006]
[Problems to be solved by the invention]
However, in the conventional connection structure between the water pipe 101 and the joint 102, in order to attach the end of the pipe main body 101a to the outer periphery of the connection cylinder 103, the inner diameter of the end is larger than the outer diameter of the connection cylinder 103. The diameter must be expanded to be larger. That is, it is necessary to increase the inner diameter of the end of the tube main body 101a so that the inner diameter of the end is larger than the state in which the inner peripheral surface of the end of the tube main body 101a is pressed against the outer peripheral surface of the connection tube 103. There was a problem that an unnecessarily large load acts on the part.
[0007]
The present invention has been made by paying attention to the problems existing in the above conventional technology. The purpose is to minimize the load acting on the end when the pipe body is expanded, and to reduce the flow loss at the end of the pipe body when the pipe body is connected to the connector. It is an object of the present invention to provide a water pipe having an end structure and a water pipe having the end structure. Another object is to minimize the load acting on the end of the pipe main body during the work of expanding the diameter of the pipe main body, and to reduce the flow loss at the end of the pipe main body in the connection state between the pipe main body and the connector. An object of the present invention is to provide a connection structure capable of connecting a water pipe having an end structure capable of being connected to a connection body. Still another object is to minimize the load acting on the end of the pipe main body during the work of expanding the diameter of the pipe main body, and to reduce the flow loss at the end of the pipe main body in the connection state between the pipe main body and the connector. An object of the present invention is to provide a forming method capable of forming an end structure that can be reduced in size.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is formed at the end of the pipe main body of the water pipe made of a synthetic resin material in order to reduce the flow loss at the end of the pipe main body. In the end structure of the water pipe, the annular inner body made of a metal material inserted inside the end of the pipe body has an inner diameter of the inner body and an inner diameter of the pipe body of the non-expanded portion. The gist is that the diameter is enlarged from the inside so that the diameters are substantially the same.
[0009]
According to a second aspect of the present invention, in the end structure of the water pipe according to the first aspect, the connection is provided at a connecting cylinder portion of the connecting body by projecting outward from an outer surface of the pipe main body due to the diameter expansion of the inner body. The gist is that a connection bulging portion is formed to connect the pipe main body to the connecting cylinder portion in a state in which the engaging portion of the means is engaged to prevent the tube main body from coming off.
[0010]
According to a third aspect of the present invention, in the end structure of the water pipe according to the first or second aspect, the inner body is formed by an annular ring body.
[0011]
According to a fourth aspect of the present invention, in the end structure of the water pipe according to the first or second aspect, the inner body is formed by winding a wire in an annular shape.
[0012]
According to a fifth aspect of the present invention, in the end structure of the water pipe according to the first or second aspect, the gist is such that the inner body is formed of a cylindrical body.
According to a sixth aspect of the present invention, in the end structure of the water pipe according to the first aspect, the inner body is formed of a cylindrical body, and extends from an end surface of the pipe main body when inserted into the pipe main body. The gist of the present invention includes an extension portion, and the extension portion is a fixing portion for connecting the pipe main body to the connecting body.
[0013]
The gist of the invention described in claim 7 is that the end structure according to any one of claims 1 to 6 is provided at one end or both ends of the tube main body.
According to an eighth aspect of the present invention, there is provided a water passage formed to connect the water pipe provided with the end structure according to any one of the second to fifth aspects to a connecting body in a state where the water pipe is prevented from falling off. A connecting structure between a water pipe and a connecting body, wherein the connecting pipe is formed by engaging a connecting bulging portion of the pipe main body with an engaging portion of a connecting means provided on a connecting cylindrical portion. .
[0014]
According to a ninth aspect of the present invention, in the connection structure between the water pipe and the connection body having the end structure according to the eighth aspect, the connection means is screwed and attached to the connection cylinder. The gist of the invention is that it is formed of a pull-out preventing sleeve provided with an engagement portion that engages with the connection bulging portion in the state.
[0015]
According to a tenth aspect of the present invention, in the connecting structure between the water pipe having the end structure according to the eighth aspect and the connecting member, the connecting means includes an engaging member having an engaging portion, and the engaging member. And an attachment body attached to the connection tubular portion to maintain the engagement with the connection bulging portion.
[0016]
According to an eleventh aspect of the present invention, in the connection structure between the water pipe having the end structure according to the tenth aspect and the connection body, the attachment body holds the engagement body inside and has a connection cylinder portion. The gist of the present invention is that it is formed by a fixing sleeve that is screwed into and attached to.
[0017]
According to a twelfth aspect of the present invention, in the connection structure between the water pipe and the connector having the end structure according to the eleventh aspect, the fixing sleeve has an end on which a swelling portion for connection of the pipe body is formed. The gist of the present invention is to pass through the outside of the bulging portion for connection from the portion side and to be attached to the pipe main body.
[0018]
According to a thirteenth aspect of the present invention, in the connection structure between the water pipe and the connection body having the end structure according to any one of the tenth to twelfth aspects, the engagement body includes a plurality of divided bodies. The gist of the present invention is that it is formed by assembling, and after the connection bulging portion is formed, it is engaged with and attached to the connecting bulging portion.
[0019]
According to a fourteenth aspect of the present invention, in the connection structure between the water pipe having the end structure according to the tenth aspect and the connection body, the attachment body is connected to the engagement body inserted into the connection cylinder. The gist is that it is formed by a pin body attached to the connection cylinder portion in order to prevent the tube from being pulled out from the inside.
[0020]
The invention according to claim 15 is a method for forming an end structure for reducing a flow loss at an end of a pipe main body of a synthetic resin material water flow pipe in the pipe main body, the method comprising: An annular inner body made of a metal material is inserted inside the end, and the inner body is expanded from the inner side so that the inner diameter of the inner body and the inner diameter of the pipe body of the non-expanded portion are substantially the same. The gist is to measure the diameter.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, an embodiment of the end structure of a water pipe embodying the present invention, a water pipe having the end structure, a connection structure between the water pipe and the connector, and a method of forming an end structure of the water pipe will be described. This will be described with reference to FIGS. In addition, up, down, left, and right in the following description of the first embodiment correspond to up, down, left, and right in FIG.
[0022]
As shown in FIG. 1, the end structure 10 of the water pipe 11 is used to reduce the flow loss at the end of the water pipe 11 made of a synthetic resin material. It is formed at the right end of the main body 11a. And the flow loss at the end of the water pipe 11 connected to the joint 12 as a connecting body can be reduced. Specifically, a ring body 13 as an inner body made of a metal material is inserted inside the right end portion of the pipe main body 11a, and the ring body 13 is expanded in diameter from the inside, and the inner diameter of the ring body 13; The inner diameter of the tube main body 11a in the non-expanded portion is substantially the same.
[0023]
As shown by a broken line in FIG. 2A, the ring body 13 is formed in an annular shape from a metal material (copper is used in this embodiment), and is formed outside the ring body 13 before being inserted into the tube main body 11a. The diameter is formed slightly smaller than the inner diameter of the tube body 11a. By expanding the diameter of the ring body 13 from the inside of the tube main body 11a, a connection bulging portion 11b projecting outward is formed at the right end of the tube main body 11a.
[0024]
As shown in FIGS. 1 and 2A, a joint 12 to which the water pipe 11 is connected is formed by a joint body 12a, an engagement sleeve 19, and a fixed sleeve 20 which are formed in a substantially cylindrical shape from a synthetic resin material or a metal material. It is mainly formed. In the first embodiment, the joint body 12a, the engagement sleeve 19, and the fixed sleeve 20 are formed of a synthetic resin material. At the left end of the joint main body 12a, a connection tube portion 14 for connecting the pipe main body 11a is formed, and at the right end thereof, a connection tubular part (not shown) is formed so as to be connectable. A male screw 15 is threaded on the outer peripheral surface of the connection tube portion 14. As shown in FIG. 1, an annular first contact surface 16 is formed inside the connection tube portion 14 of the joint body 12 a, and the first contact surface 16 is located on the left end side of the joint body 12 a with respect to the first contact surface 16. A seal member 17 formed in a ring shape from a rubber material is attached to two places on the inner peripheral surface. In addition, the seal member 17 may be attached to only one place in the joint main body 12a, or may be attached to three or more places. On the left end side of the joint body 12a with respect to the seal member 17, a second contact surface 18 having an annular shape and having an inner diameter and an outer diameter larger than the first contact surface 16 is formed.
[0025]
As shown in FIG. 2A, the engagement sleeve 19 as an engagement body of the connection means provided in the connection cylinder portion 14 has a cylindrical shape in which the outer diameter on the left side is smaller than the outer diameter on the right side, and is substantially at the center. The portion is formed with a reduced diameter portion 19c whose outer diameter decreases from the right side to the left side of the engagement sleeve 19. As shown in FIG. 2B, the engagement sleeve 19 is formed by assembling a pair of divided bodies 19a having a semi-cylindrical shape. The divided bodies 19a are integrated by connecting one side edge to each other, and are formed so that the divided bodies 19a can be separated from each other or assembled around the joint. On the inner peripheral surface of the engagement sleeve 19, an engagement recess 19b as an engagement portion with which the connection bulging portion 11b can engage when the engagement sleeve 19 is mounted on the outer peripheral surface of the tube main body 11a. The engaging sleeve 19 is recessed along the circumferential direction.
[0026]
A fixed sleeve 20 as an attachment body forming a connecting means screwed and attached to the connection cylindrical portion 14 has a substantially cylindrical shape, and a left end of the fixed sleeve 20 is moved toward a right end of the fixed sleeve 20. The outer and inner diameters are formed so as to expand. An inner hole 20 a having a diameter slightly larger than the outer diameter of the engagement sleeve 19 on the left end side is formed on the left end side of the fixed sleeve 20. The diameter of the inner hole 20a is set slightly larger than a value obtained by adding a value twice as large as the diameter of the wire forming the ring body 13 to the outer diameter of the tube body 11a. A female screw 20b that can be screwed to the male screw 15 is threaded on the inner peripheral surface on the right end side of the fixed sleeve 20. The joint 12 is formed by screwing the fixed sleeve 20 to the joint body 12a and positioning the engagement sleeve 19 between the joint body 12a and the fixed sleeve 20.
[0027]
Next, the diameter expanding tool 21 for expanding the diameter of the ring body 13 to form the bulging portion 11b for connection in the pipe main body 11a will be described. As shown in FIGS. 3A, 3B, and 4, the diameter-enlargement tool 21 includes an insert 24 having the ring body 13 forming the connection bulging portion 11b, and an insert 24 having the same. It is provided in a state where it is inserted inside, and is mainly formed with a drawing body 22 inserted into the end of the tube main body 11a. The drawn body 22 is formed in a cylindrical shape from a metal material. In FIG. 4, an enlarged diameter portion 22 a having a constant outer diameter is formed at the left end of the drawn body 22 along the axial direction of the drawn body 22. ing. The diameter of the enlarged diameter portion 22a is formed to be substantially the same as the inner diameter of the tube main body 11a, and the outer diameter of the drawn body 22 is reduced from the enlarged diameter portion 22a toward the right end side of the drawn body 22. Is formed in a tapered shape.
[0028]
Further, as shown in FIG. 3B, a pull-out pin 23 for performing a work of pulling out the pull-out body 22 from the inside of the tube main body 11a is attached to the pull-out body 22. When the head 23a of the extraction pin 23 disposed in the extraction body 22 is locked to the inner peripheral edge on the right end side of the extraction body 22, the extraction pin 23 comes off from the right side of the extraction body 22. Not attached.
[0029]
The insert 24 has a substantially cylindrical shape, and has a cylindrical portion 24a on the left side of the insert 24 into which the pull-out member 22 can be inserted, and a shaft of the pull-out pin 23 on the right side of the cylindrical portion 24a. An insertion support portion 24b that can insert and support the portion extends. The ring 13 is adhered to the left open end of the cylindrical portion 24a with an adhesive such that the inner peripheral edge of the ring 13 protrudes inward from the inner peripheral surface of the cylindrical portion 24a. . Further, a support portion 24c that protrudes outward in the radial direction of the insert 24 is protruded from an outer peripheral surface of a central portion of the insert 24.
[0030]
Then, in the extraction member 22 to which the extraction pin 23 is attached, the shaft portion of the extraction pin 23 is inserted from the cylindrical portion 24a into the insertion support portion 24b, and the extraction member 22 is inserted into the cylindrical portion 24a and expanded. A diameter tool 21 is formed. In the diameter-enlarging tool 21, the inner peripheral surface of the ring body 13 is brought into contact with the outer peripheral surface of the extraction body 22 so that further insertion of the extraction body 22 into the insertion body 24 is restricted, and the insertion support portion is provided. The shaft of the extraction pin 23 protrudes from 24b.
[0031]
Next, a method of connecting the water pipe 11 and the joint 12 after forming the water pipe 11 having the end structure 10 by expanding the diameter of the ring body 13 using the diameter expanding tool 21 will be described. . First, as shown in FIG. 4, the insertion body 24, the extraction body 22 and the ring body 13 of the diameter-enlargement tool 21 are inserted into the pipe main body 11a, and the end face of the pipe main body 11a is brought into contact with the support portion 24c. Subsequently, when the extraction pin 23 is pulled in a direction away from the tube main body 11a using a special extraction tool or the like, the extraction body 22 with the head 23a locked by the movement of the extraction pin 23 is located in the inner side of the cylindrical portion 24a. Pulled to.
[0032]
Then, since the outer diameter of the outer peripheral surface of the drawn body 22 is increased toward the left end side of the drawn body 22, the ring 13 is moved as the drawn body 22 moves into the cylindrical portion 24a. The outer diameter of the drawn body 22 that comes into contact with the inner peripheral surface of the cylindrical member 24 increases, and the diameter of the ring body 13 protruding toward the inner peripheral side of the cylindrical portion 24a is increased.
[0033]
In the expanded state of the ring body 13, the inner diameter of the ring body 13 and the inner diameter of the non-expanded portion of the tube main body 11a to which the ring body 13 is not mounted are substantially the same. In addition, by expanding the diameter of the ring body 13, the right end of the tube body 11 a is pushed out from the inside to the outside by the ring body 13, as shown in FIG. 2. Finally, the insert 24 is withdrawn from the inside of the tube main body 11a.
[0034]
Therefore, the ring bulge 13 remaining in the pipe main body 11a forms a connection bulging portion 11b protruding outward on the outer peripheral surface of the pipe main body 11a. That is, the connection bulging portion 11b that connects the pipe main body 11a to the connection cylinder portion 14 in a state where the engagement concave ridges 19b of the engagement sleeve 19 provided on the connection cylinder portion 14 of the joint 12 are engaged. Is formed. Then, while the connecting bulging portion 11b is formed, the water pipe 11 having the end structure 10 for reducing the flow loss is formed.
[0035]
Now, in order to connect the water pipe 11 having the connection bulge 11b formed at the end of the pipe main body 11a to the joint 12, first, as shown in FIG. The fixed sleeve 20 is attached to the tube main body 11a through the inner hole 20a of the fixed sleeve 20 from the end on the side where the portion 11b is formed. At this time, the diameter of the inner hole 20a of the fixed sleeve 20 is set to be larger than the value obtained by adding twice the diameter of the wire forming the ring body 13 to the outer diameter of the tube body 11a. For this reason, the outer diameter of the connection bulging portion 11b is smaller than the diameter of the inner hole 20a, and the fixed sleeve 20 is connected to the connection bulging portion 11b without locking the connection bulging portion 11b and the peripheral edge of the inner hole 20a. It passes through the outside of 11b and is attached to the tube main body 11a.
[0036]
Next, the engagement sleeve 19 is arranged on the outer peripheral side of the connection bulging portion 11b in a state of being divided into a pair of divided bodies 19a. Then, a pair of divided bodies 19a are assembled so that the connection bulging portion 11b is engaged with the engaging concave ridge 19b to form the engagement sleeve 19, and as shown in FIG. Attach the mating sleeve 19. Next, the end of the tube main body 11a to which the engagement sleeve 19 is attached is inserted into the connection tube portion 14 of the joint main body 12a.
[0037]
Then, the female screw 20b of the fixing sleeve 20 is screwed into the male screw 15 of the joint body 12a. Then, as the fixed sleeve 20 is screwed into the joint main body 12a, the end of the engagement sleeve 19 is inserted into the inner hole 20a, and the outer peripheral surface of the reduced diameter portion 19c of the engagement sleeve 19 is formed. The inner peripheral surface of the inner hole 20a gradually comes into pressure contact, and the diameter of the engagement sleeve 19 is reduced. At the same time, the engagement sleeve 19 is pressed toward the inside of the connection tube portion 14, and the tube main body 11 a with which the engagement groove 19 b of the engagement sleeve 19 is engaged is also pressed toward the inside of the connection tube portion 14.
[0038]
As a result, the right end face of the tube main body 11a comes into contact with the first contact face 16 and the right end face of the engagement sleeve 19 comes into contact with the second contact face 18. Further, the engagement sleeve 19 is held inside the fixed sleeve 20 screwed and attached to the joint main body 12a, so that the detachment from the fixed sleeve 20 is prevented. Furthermore, since the engagement sleeve 19 is interposed between the inner peripheral surface of the inner hole 20a and the outer peripheral surface of the pipe main body 11a, the water pipe 11 protruding from the inner hole 20a is stably connected to the joint 12. Will be retained. Then, the joint 12 is formed by assembling the joint body 12a, the engagement sleeve 19, and the fixed sleeve 20.
[0039]
At the same time, the end structure 10 is provided by engaging the engagement ridge 19b of the engagement sleeve 19 held in the fixed sleeve 20 screwed to the connection cylinder portion 14 with the connection bulging portion 11b. A connection structure is formed in which the water pipe 11 is connected to the joint 12 in a state where the water pipe 11 is retained. The tube main body 11a is connected to the connection tube portion 14 in a state where it is prevented from falling off. In other words, the fixing sleeve 20 is attached to the connection cylinder portion 14 in a state where the engagement between the engagement recesses 19b of the engagement sleeve 19 and the connection bulging portion 11b is maintained. Further, the inner peripheral surfaces of the pair of seal members 17 are closely attached to the outer peripheral surface of the pipe main body 11a, and the sealing property between the outer peripheral surface of the pipe main body 11a and the inner peripheral surface of the joint main body 12a is maintained.
[0040]
In the connection state between the water pipe 11 and the joint 12, the inner diameter of the ring body 13 and the inner diameter of the non-expanded portion of the pipe main body 11a are almost the same. Therefore, at the connection between the end of the pipe main body 11a and the joint 12, the flow loss of the fluid flowing through the water pipe 11 by the ring body 13 is reduced.
[0041]
According to the first embodiment, the following features can be obtained.
(1) The ring body 13 inserted into the pipe main body 11a was expanded from the inside such that the inner diameter of the ring body 13 was almost the same as the non-expanded portion of the pipe main body 11a. Therefore, in order to fit the tube main body to the inner tube portion of the joint, the tube main body 11a is different from the conventional case in which the inner diameter of the tube body must be increased more than necessary until it becomes larger than the outer diameter of the inner tube portion. Can be reduced to a necessary minimum to reduce the load acting on the pipe main body 11a. Therefore, it is possible to prevent the pipe body 11a from being damaged or deformed by the load, and to reduce the flow loss at the end of the pipe body 11a.
[0042]
(2) Since the ring body 13 has a ring shape, the diameter can be easily increased by using the diameter expanding tool 21, and the connection bulging portion 11b can be easily formed.
(3) Since the ring body 13 is made of a metal material, after the connection bulging portion 11b is formed by the ring body 13, the connection bulging portion 11b can be always formed without reducing or deforming the diameter. Therefore, the water pipe 11 can be connected to the joint 12 in a stable state while maintaining the engagement between the connection bulging portion 11b and the engagement concave ridge 19b.
[0043]
(4) Since the diameter of the annular ring body 13 is increased to form the connection bulging portion 11b, the diameter of the pipe body is directly increased by using a diameter increasing jig, unlike the conventional pipe body. The end of the main body 11a can be expanded to a state close to a perfect circle. Accordingly, the connection bulging portion 11b and the inner peripheral edge on the left side of the fixed sleeve 20 can be reliably engaged, and the connection between the water pipe 11 and the joint 12 can be reliably maintained.
[0044]
(5) Since the engagement sleeve 19 is formed by assembling the pair of divided bodies 19a, it is possible to attach the engagement sleeve 19 to the water pipe 11 after the connection bulging portion 11b is formed in the pipe main body 11a. it can. Therefore, after the engagement sleeve 19 is attached to the water pipe 11, it is not necessary to increase the diameter of the ring body 13 so that the connection bulging portion 11b engages with the engagement recess 19b. The work of attaching to the water pipe 11 and the work of connecting the water pipe 11 and the joint 12 can be performed quickly.
[0045]
(6) Since the outer diameter on the right end side of the engagement sleeve 19 is formed larger than the diameter of the inner hole 20 a of the fixed sleeve 20, the engagement sleeve 19 is held in the fixed sleeve 20. Therefore, the engagement sleeve 19 attached to the pipe main body 11a can be positioned by the fixed sleeve 20 screwed and connected to the joint main body 12a, and it is possible to prevent a problem that the water pipe 11 comes off from the joint 12.
[0046]
(7) The diameter of the inner hole 20a of the fixed sleeve 20 is set to be larger than a value obtained by adding twice the diameter of the metal material forming the ring body 13 to the outer diameter of the tube main body 11a. Therefore, the fixing sleeve 20 can be quickly attached to the pipe main body 11a without the peripheral edge of the inner hole 20a being locked to the connection bulging portion 11b, and the connection work between the water pipe 11 and the joint 12 can be quickly performed. Can be done.
[0047]
(8) It is possible to prevent problems that occur when using a tool for expanding the diameter of the pipe main body 11a as described below. The diameter expanding tool includes an aggregate of four divided bodies, and the aggregate is inserted into the pipe main body 11a to perform the diameter expansion operation. That is, when the rod is inserted into the center of the aggregate in the inserted state of the aggregate, the four divided bodies are pushed outward, and the entire aggregate is pushed and expanded, so that the end of the pipe body 11a is expanded. The diameter is directly expanded by each divided body. Therefore, the inner peripheral surface of the pipe main body 11a corresponding to each divided body is pushed outward, but the position corresponding to the gap between the divided bodies is not expanded. As a result, an enlarged portion and a non-increased portion are formed at the end of the pipe main body 11a after the diameter expansion, and the pipe main body 11a is not uniformly expanded in the circumferential direction. When connected, the inner peripheral surface of the seal member 17 does not closely contact the outer peripheral surface of the pipe main body 11a, causing a problem that fluid leaks from between the water pipe 11 and the joint 12. On the other hand, in the present embodiment, since the diameter of the ring body 13 is uniformly increased in the entire circumferential direction by the enlarged diameter portion 22a, the end of the tube main body 11a is uniformly expanded in the entire circumferential direction, and the ring body 13 Only the portion corresponding to 13 is enlarged. Therefore, unlike the case where the above-described tool is used, the outer peripheral surface of the substantially circular pipe main body 11a surely comes into close contact with the inner peripheral surface of the seal member 17, and fluid leaks from between the water pipe 11 and the joint 12. It is possible to prevent the occurrence of an inconvenience. Further, it is possible to prevent a problem that the inner surface of the tube main body 11a is damaged by the outer surface of the diameter expanding jig as in the case where the diameter of the tube main body 11a is directly expanded by using the above-mentioned tool.
[0048]
(Second embodiment)
Hereinafter, a second embodiment of an end structure of a water pipe, a water pipe having the end structure, a connection structure between the water pipe and the connector, and a method of forming an end structure of the water pipe embodying the present invention will be described below. Will be described with reference to FIGS. Note that the upper, lower, left, and right in the following description of the second embodiment correspond to upper, lower, left, and right in FIG.
[0049]
As shown in FIG. 5, the end structure 10 of the water pipe 11 is formed at an end of a pipe body 11a made of a synthetic resin material, and is formed to reduce a flow loss at the end of the pipe body 11a. It is. And the flow loss at the end of the water pipe 11 connected to the joint 25 as a connection body can be reduced.
[0050]
Specifically, in the end structure 10 of the water pipe 11, a tubular body 26 as an inner body made of a metal material is inserted inside the right end of the pipe body 11a, and the tubular body 26 is expanded in diameter from the inside. Thus, the inner diameter of the cylindrical body 26 and the inner diameter of the non-expanded portion of the tube main body 11a are formed to be substantially the same. As shown in FIG. 6, the cylindrical body 26 is formed in a cylindrical shape from a metal material, and the outer diameter of the cylindrical body 26 before diameter expansion is formed slightly smaller than the inner diameter of the pipe main body 11a before diameter expansion. .
[0051]
As shown in FIG. 5, the joint 25 is formed of a joint main body 27 made of a synthetic resin material or a metal material and a detachment prevention sleeve 28. In the second embodiment, the joint main body 27 and the removal prevention sleeve 28 are formed of a synthetic resin material. The joint body 27 is formed in a substantially cylindrical shape. At the left end of the joint main body 27, a connection tubular portion 27a for connecting the pipe main body 11a is formed, and at the right end, a connection tubular part (not shown) is formed so as to be connectable. A male screw 27b is threaded on the outer peripheral surface of the connection cylinder 27a. An annular first contact surface 27c is formed inside the joint body 27, and a ring-shaped sealing member 17 made of a rubber material is mounted on the first contact surface 27c. On the inner peripheral surface on the left end side of the joint main body 27 with respect to the seal member 17, a second contact surface 27d having an annular shape and having an inner diameter and an outer diameter larger than the first contact surface 27c is formed.
[0052]
As shown in FIG. 6, the pull-out preventing sleeve 28 which forms the connecting means which is screwed and attached to the connecting tubular portion 27a has a substantially cylindrical shape, and as shown in FIG. The portion is formed such that the inner diameter and the outer diameter are reduced toward the left end of the removal prevention sleeve 28. An inner hole 28a having a diameter slightly larger than the outer diameter of the tube body 11a is formed at the left end of the removal prevention sleeve 28. A female screw 28b that can be screwed to the male screw 27b is threaded on the inner peripheral surface on the right side of the removal prevention sleeve 28.
[0053]
Next, a metal-diameter expanding jig 30 for expanding the cylindrical body 26 shown in FIG. 7 will be described. In addition, up, down, left and right in the following description of the diameter expanding jig 30 correspond to up, down, left and right in FIG. As shown in FIGS. 7 and 8, the diameter expanding jig 30 includes a main sleeve 31 formed in a substantially cylindrical shape, and a disk-shaped sleeve cap 32 is screwed to a left end side of the main sleeve 31. As shown in FIG. 8, a circular hole 32a is formed in the center of the sleeve cap 32. A bolt-shaped movable bolt 33 is inserted into the main sleeve 31 so that the head side of the movable bolt 33 faces the sleeve cap 32 side.
[0054]
A female screw hole 33a is formed at the center of the head-side end surface of the movable bolt 33 so as to correspond to the circular hole 32a when inserted into the main sleeve 31. An engaging groove 33b extending along the axis of the movable bolt 33 is formed on the outer surface of the head of the movable bolt 33, and a male screw 33c is formed on the outer peripheral surface of the shaft of the movable bolt 33. .
[0055]
Then, with the shaft of the movable bolt 33 inserted into the main sleeve 31 protruding from the right end side of the main sleeve 31, the nut 35 is screwed into the male screw 33 c with the spacer 34 interposed therebetween. A movable bolt 33 is attached to 31. With the movable bolt 33 attached to the main sleeve 31, the engaging pin 38 is attached to the engaging groove 33 b of the movable bolt 33 from the outer surface of the main sleeve 31 so that the engaging pin 38 is engaged. The rotation of the movable bolt 33 in the main sleeve 31 is restricted by the engagement with the groove 33b.
[0056]
A male screw 36 a formed on the right end side of the enlarged diameter shaft 36 is screwed into the female screw hole 33 a of the movable bolt 33 in the main sleeve 31, and the enlarged diameter shaft 36 is attached to the movable bolt 33. The left side of the enlarged diameter shaft 36 is formed so that the diameter gradually increases toward the left side, and an enlarged diameter portion 36b having a constant outer diameter is formed at the left end. The diameter of the enlarged diameter portion 36b of the enlarged diameter shaft 36 is formed slightly smaller than the inner diameter of the tube body 11a, and slightly larger than the inner diameter of the cylindrical body 26.
[0057]
Next, the water pipe 11 having the end structure 10 is formed by using the diameter increasing jig 30, and the water pipe 11 and the joint 25 are connected by using the connection bulging portion 11 b of the end structure 10. The connection method will be described. First, as shown in FIG. 6, a detachment prevention sleeve 28 is attached to the pipe main body 11a. Next, the nut 35 is retreated from the movable bolt 33 and the movable bolt 33 is moved until the head-side end surface contacts the inner surface of the main sleeve 31 on the sleeve cap 32 side. Next, as shown in FIG. 8, in a state where the cylindrical body 26 is mounted on the enlarged diameter shaft 36, the male screw 36 a of the enlarged diameter shaft 36 is screwed into the female screw hole 33 a to connect the enlarged diameter shaft 36 to the movable bolt 33. Attach to
[0058]
Subsequently, the nut 35 is screwed into the movable bolt 33 in a state where the end of the tube main body 11a is externally fitted to the cylindrical body 26 and the tube main body 11a is mounted on the enlarged diameter shaft 36. Then, as shown in FIG. 9, since the movable bolt 33 does not rotate due to the engagement between the engagement pin 38 and the engagement groove 33b, the movable bolt 33 is moved to the main sleeve so that the engagement groove 33b extends along the engagement pin 38. The main sleeve 31 is drawn into the main sleeve 31 along the axis.
[0059]
Simultaneously with the movement of the movable bolt 33, the enlarged diameter shaft 36 is drawn into the main sleeve 31. Then, the enlarged diameter portion 36a of the enlarged diameter shaft 36 is gradually inserted into the cylindrical body 26, and the cylindrical body 26 is gradually pushed outward from the left to the right by the enlarged diameter portion 36b to expand. The pipe body 11a is also expanded in diameter. At this time, the inner peripheral surface of the cylindrical body 26 expanded by the enlarged diameter portion 36b of the enlarged diameter shaft 36 having an outer diameter slightly smaller than the inner diameter of the pipe main body 11a and the inner diameter of the non-expanded portion of the pipe main body 11a are different. It will be almost the same.
[0060]
By expanding the diameter of the tube main body 11a and the cylindrical body 26 at the same time, the outer peripheral surface of the cylindrical body 26 is pressed against the inner peripheral surface of the end of the pipe main body 11a, and the end of the pipe main body 11a and the cylindrical body 26 A seal structure for preventing leakage of fluid is formed therebetween. At the end of the tube main body 11a, a connection bulging portion 11b projecting outward is formed on the outer surface of the tube main body 11a by the expanded cylindrical body 26. A water pipe 11 having an end structure 10 for reducing flow loss and a bulging portion 11b for connection is formed at an end of the pipe body 11a.
[0061]
In order to connect the joint 25 and the water pipe 11, first, as shown in FIG. 5, the end of the pipe body 11 a on the side where the connection bulging part 11 b is formed is placed in the connection cylinder part 27 a. Then, the right end surface of the tube body 11a is brought into contact with the second contact surface 27d, and the right end surface of the tubular body 26 is brought into contact with the seal member 17. Subsequently, the female screw 28b of the pull-out preventing sleeve 28 is screwed into the male screw 27b, and the pull-out preventing sleeve 28 is attached to the joint main body 27, whereby the joint 25 is formed. At this time, since the diameter of the inner hole 28a of the pull-out preventing sleeve 28 is formed to be substantially the same as the outer diameter of the non-expanded portion of the tube main body 11a, the outer diameter of the connection bulging portion 11b formed by the enlarged diameter is reduced. Smaller than the diameter.
[0062]
Therefore, the connection bulging portion 11b is engaged with the left inner peripheral edge as an engaging portion of the pull-out preventing sleeve 28 screwed and attached to the joint main body 27, and the pipe main body 11a is separated from the pull-out preventing sleeve 28. The escape is prevented. In other words, a connection structure between the water pipe 11 and the joint 12 is formed by the connection bulging portion 11b and the removal prevention sleeve 28, and the water pipe 11 is connected to the joint 25 in a state where the water pipe 11 is prevented from coming off. Therefore, at the same time as the joint 25 is formed by screwing the removal prevention sleeve 28 to the joint main body 27, the water pipe 11 can be connected to the joint 25, and the connection operation between the water pipe 11 and the joint 25 can be easily performed. be able to.
[0063]
In the connection state between the water pipe 11 and the joint 25, the sealing structure between the inner peripheral surface of the pipe body 11a and the outer peripheral surface of the cylindrical body 26 allows the fluid flowing through the water pipe 11 from the end of the pipe body 11a. Leakage to the joint body 27 side is prevented. Furthermore, the fluid is prevented from flowing into the joint main body 27 by the seal member 17. Further, since the inner diameter of the cylindrical body 26 and the inner diameter of the non-expanded portion of the tube main body 11a are formed to be substantially the same, the flow loss of the fluid flowing through the pipe main body 11a due to the cylindrical body 26 can be reduced.
[0064]
The above embodiments may be modified as follows.
-The joint 40 as a connection body shown in FIG. 10 and the water pipe 11 provided with the end structure 10 may be connected. Up, down, left and right in the following description correspond to up, down, left, and right in FIG. As shown in FIG. 10, at the right end of the water pipe 11, a cylindrical body 26 is expanded such that the inner diameter is the same as the inner diameter of the pipe main body 11a in the non-expanded portion, as in the second embodiment. An end structure 10 is formed by forming a connection bulging portion 11b.
[0065]
Next, the joint 40 as a connecting body will be described. The joint 40 is used for connecting the water pipes 11 to each other, and includes a joint body 41 formed of a synthetic resin material or a metal material in a substantially cylindrical shape, a pin body 42 and a split ring 43 attached to the joint body 41. It is mainly formed. In this case, the joint body 41, the pin body 42, and the split ring 43 were formed of a synthetic resin material. At both ends (only the left end is shown in FIG. 10) of the joint body 41, connection tube portions 41a are formed, and at the outer surfaces near the end surfaces of the connection tube portions 41a, protrusion portions 41b are formed. As shown in FIG. 11, a pin 42 formed in a substantially U-shape is attached to each protruding portion 41b, and this pin 42 is provided as an attachment forming a connection means. Further, the pin body 42 is attached to the protruding portion 41b such that both ends extend in a direction away from the protruding portion 41b. The pin bodies 42 are attached so as to be rotatable around the portions attached to the protruding portions 41b, respectively.
[0066]
A pair of engaging projections 41c protruding outward from the end surface of the connection cylinder 41a along the axis of the joint body 41 at positions substantially opposite to the protrusions 41b on the end surface of each connection cylinder 41a. It is protruding. An engagement recess 41d with which the pin body 42 can be engaged is formed in the inner surface of each engagement protrusion 41c.
[0067]
Then, by rotating the pin body 42 toward the engagement protrusion 41c and further engaging the pin body 42 with the engagement recess 41d, the pin body 42 can be arranged so as not to rotate. At this time, as shown in FIG. 12, the pin body 42 is arranged so as to cross the opening of the connection cylinder 41a. As shown in FIG. 10, a locking ridge 41 e extending along the circumferential direction of the joint body 41 is formed on the inner peripheral surface in the joint body 41.
[0068]
As shown in FIG. 11, the split ring 43 provided on the connection tube portion 41a and serving as an engagement member forming the connection means is formed in a C-shaped cross section by cutting the tube body along the axial direction. . Then, as shown in FIG. 10, when inserted into the connection tube portion 41a, the diameter is reduced by the inner peripheral surface of the connection tube portion 41a. Further, the split ring 43 is formed such that the right end face of the split ring 43 is engaged with the connection bulging portion 11b as an engagement portion when inserted into the connection tubular portion 41a.
[0069]
Now, in order to connect the joint 40 and the water pipe 11 having the above configuration, first, the water pipe 11 having the end structure 10 is formed using the tubular body 26 in the same manner as in the second embodiment. Next, the split ring 43 and the seal member 17 are attached to the end of the pipe main body 11a on the side where the connection bulging portion 11b is formed. Then, while the pin body 42 is rotated to open the opening of the connection cylinder 41a, the side of the tube main body 11a where the connection bulging portion 11b is formed is inserted into the connection cylinder 41a. Further, with the seal member 17 and the split ring 43 inserted into the connection cylinder portion 41a, the pin body 42 is rotated so that both ends of the pin body 42 approach the engagement protrusion 41c.
[0070]
Then, the pin body 42 comes into contact with the left end surface of the split ring 43, and the split ring 43 is pressed by the pin body 42 to the inside of the connection cylinder 41 a, and the sealing member 17 is moved by the split ring 43 to the inside of the connection cylinder 41 a. Moved to At this time, the diameter of the split ring 43 is reduced by the inner peripheral surface of the connection tubular portion 41a, and the split ring 43 is pressed against the outer peripheral surface of the pipe body 11a.
[0071]
Further, the right end face of the split ring 43 is engaged with the connection bulging portion 11b, and the split ring 43 is pushed into the inside of the connection tube portion 41a in the engaged state, so that the pipe main body 11a is pushed into the inside of the connection tube portion 41a. Sent to When the pin body 42 is engaged with the engagement recess 41d, the joint 40 is formed. At the same time, the end face of the pipe main body 11a is locked by the locking ridge 41e in the connection tubular portion 41a, and further movement of the pipe main body 11a to the inside of the joint main body 41 is restricted. In addition, the sealing member 17 is pressed against the outer peripheral surface of the pipe main body 11a, and the sealing property between the joint main body 41 and the water pipe 11 is maintained.
[0072]
In a state where the pin body 42 is engaged with the engagement recess 41d, as shown in FIG. 12, the pin body 42 traverses the opening of the connection cylinder 41a. Therefore, the split ring 43 engaged with the connection bulging portion 11b is prevented from falling out of the connection tubular portion 41a by the pin body 42, and the pin body 42 prevents the split ring 43 from being engaged with the connection bulging portion 11b. Is maintained. Accordingly, a connection structure for connecting the water pipe 11 having the end structure 10 to the joint 40 in a state where the water pipe 11 is prevented from falling off is formed by the engagement between the pipe main body 11a and the split ring 43. The water pipe 11 is prevented from falling out of the pipe 40 and the water pipe 11 and the joint 40 are connected.
[0073]
As a result, the engagement between the pin body 42 and the engagement recess 41d prevents the split ring 43 engaged with the connection bulging portion 11b from coming out of the connection cylinder portion 41a, thereby preventing the split ring 43 from coming out of the connection cylinder portion 41a. The tube main body 11a can be prevented from coming off. As compared with the case where the detachment prevention sleeve 28 is screwed to the joint main body 27 as in the second embodiment, the operation of connecting the water pipe 11 to the joint 40 in a state where it is prevented from being detached can be easily performed. .
[0074]
In the second embodiment, the end structure 10 of the water pipe 11 may be formed by attaching the cylindrical body 26 as the inner body shown in FIG. The tubular body 26 has an extending portion 26a formed on the right end side of the tubular body 26 and extending while expanding its diameter outward. Further, the left end surface of the connection tubular portion 27 a of the joint main body 27 is formed in a tapered shape so as to increase in diameter toward the center of the joint main body 27. Further, the right end side of the pull-out preventing sleeve 28 is enlarged in diameter such that the inner peripheral surface at the center of the pull-out preventing sleeve 28 forms a locking step 28c extending along the circumferential direction of the pull-out preventing sleeve 28. I do.
[0075]
Then, the cylindrical body 26 inserted inside the pipe main body 11a is expanded so that the inner diameter is substantially the same as the inner diameter of the non-expanded portion of the pipe main body 11a, and the connection bulges on the outer surface of the pipe main body 11a. The portion 11b is formed to form the water pipe 11 having the end structure 10. Also at this time, the outer peripheral surface of the cylindrical body 26 is pressed against the inner peripheral surface of the tube main body 11a, and a seal structure is formed between the end of the tube main body 11a and the cylindrical body 26. Therefore, it is possible to prevent a problem that the fluid flowing in the water pipe 11 leaks from between the inner peripheral surface of the pipe main body 11a and the outer peripheral surface of the cylindrical body 26 to between the joint main body 27 and the removal prevention sleeve 28. it can. Further, the inner peripheral surface of the extension portion 26a is brought into contact with the end surface of the joint main body 27, and in this state, the removal prevention sleeve 28 is screwed to the joint main body 27.
[0076]
As a result, the extended portion 26a is sandwiched between the left end surface of the joint main body 27 and the locking step 28c of the removal prevention sleeve 28, and the connection bulging portion 11b is formed on the inner surface of the removal prevention sleeve 28. Engage. Therefore, the pipe main body 11a is prevented from falling out of the removal prevention sleeve 28 attached to the joint main body 27. That is, the water pipe 11 is connected to the joint 25 in a state where it is prevented from falling off. The water pipe 11 with the end structure 10 formed in advance may be carried into the construction site, and the water pipe 11 and the joint 25 may be connected at the construction site.
[0077]
A connection member 54 as an inner body shown in FIG. 14 is attached to the pipe body 11a, and the diameter of the connection member 54 is increased from the inside so that the inner diameter of the connection member 54 and the inner diameter of the non-expanded portion of the pipe body 11a are substantially equal. The water pipe 11 having the end structure 10 may be formed in the same manner. The connection member 54 is formed in a substantially cylindrical shape from a metal material. A connecting flange 54b protruding outward along the circumferential direction of the connecting member 54 is formed as an extended portion and a fixed portion on the outer peripheral edge of one end of the connecting member 54, and a bolt 55 is inserted into the connecting flange 54b. Possible insertion holes 54c are formed at two places.
[0078]
Now, in a state where the connecting member 54 is inserted inside the right end portion of the pipe main body 11a, the connecting member 54 and the pipe are so arranged that the inner diameter of the connecting member 54 and the inner diameter of the non-expanded portion of the pipe main body 11a are substantially the same. When the diameter of the main body 11a is expanded, the water pipe 11 having the end structure 10 is formed. Also at this time, the outer peripheral surface of the connecting member 54 is pressed against the inner peripheral surface of the pipe main body 11a, and a seal structure is formed between the connecting member 54 and the pipe main body 11a. As a result, it is possible to prevent a problem that the fluid flowing through the water pipe 11 leaks from between the outer peripheral surface of the connecting member 54 and the inner peripheral surface of the pipe main body 11a.
[0079]
In order to connect the water pipe 11 to another water pipe 11 having a connecting member 54 as a connecting body, a bolt 55 is inserted into an insertion hole 54c of each connecting member 54, and a nut 56 is screwed into each bolt 55. The connection members 54 are connected and fixed to each other. As a result, the water pipes 11 can be connected to each other. In addition, the water pipe 11 in which the end structure 10 is formed in advance may be carried into the construction site, and the water pipes 11 may be connected to each other at the construction site.
[0080]
The end structure 10 may be formed in the water pipe 11 using the end forming member 60 shown in FIG. 15, and the water pipe 11 having the end structure 10 may be connected to the connector. The vertical and horizontal directions of the water pipe 11 and the end forming member 60 correspond to the vertical and horizontal directions in FIG. The end forming member 60 has a substantially cylindrical shape, and on the left side of the end forming member 60, an inner portion 60a as an annular inner body, and an annular outer member located outside the inner portion 60a. An outer part 60b as a body is formed.
[0081]
An annular groove 60c is formed between the inner part 60a and the outer part 60b on the left side of the end forming member 60, and the end of the pipe body 11a can be inserted into the annular groove 60c. Is formed. That is, the inner diameter of the inner part 60a is formed smaller than the inner diameter of the pipe main body 11a, and when the pipe main body 11a is inserted into the annular groove 60c, the inner part 60a is inserted inside the pipe main body 11a, and the outer part 60b is connected to the pipe main body. It is formed so as to be arranged outside the main body 11a. The intermediate member 64 made of synthetic resin inserted between the inner peripheral surface of the annular groove 60c and the outer peripheral surface of the pipe main body 11a inserted into the annular groove 60c has a substantially cylindrical shape. It is cut out along the axial direction and has a C-shaped cross section.
[0082]
On the right side of the end forming member 60, an extending portion 60d extending from the inner portion 60a and the outer portion 60b is formed as a fixed portion. Seal members 17 are mounted at two places on the outer peripheral surface of the extension 60d, and the inside diameter of the extension 60d is formed to be substantially the same as the inside diameter of the tube body 11a. As shown in FIG. 16, the joint 62 as a connection body connected to the end forming member 60 is formed in a substantially cylindrical shape from a synthetic resin material or a metal material, and a connection cylinder portion 62a is formed on the left side thereof. .
[0083]
Now, in order to form the water pipe 11 having the end structure 10 for reducing the flow loss at the end of the pipe body 11a using the end forming member 60, first, as shown in FIG. The intervening member 64 is mounted on the main body 11a. Further, a diameter expanding member 61 for expanding the diameter of the inner portion 60a of the end forming member 60 is inserted into the tube main body 11a. The enlarged diameter member 61 has a bulging portion 61a formed at the left end portion with a diameter substantially equal to the inner diameter of the tube main body 11a, and a grip portion 61b extending linearly from the bulging portion 61a.
[0084]
Then, the bulging portion 61a is inserted into the tube main body 11a. Thereafter, the end of the tube body 11a is inserted into the annular groove 60c of the end forming member 60, the inner portion 60a is inserted inside the tube body 11a, and the outer portion 60b is arranged outside the tube body 11a. The end forming member 60 is attached to the tube main body 11a as described above. Further, the interposition member 64 is inserted between the inner peripheral surface of the annular groove 60c and the outer peripheral surface of the pipe main body 11a. Subsequently, the grip portion 61b is gripped with a hand or a dedicated extraction tool or the like, and the pipe main body 11a is gripped. The bulging portion 61a passes through the inner portion 60a.
[0085]
Then, the inner part 60a, the pipe body 11a, the interposition member 64, and the outer part 60b are expanded in diameter by the bulging portion 61a having substantially the same diameter as the inner diameter of the pipe body 11a, and the inner diameter of the inner part 60a and the pipe body 11a are increased. Are formed so as to have substantially the same inner diameter as the non-expanded portion. At the same time, a seal structure is formed between the outer peripheral surface of the inner portion 60a and the inner peripheral surface of the pipe body 11a to prevent leakage of fluid.
[0086]
As a result, a water pipe 11 having the end structure 10 is formed. In addition, the tube body 11a is pressed from the inside of the annular groove 60c by the diameter reduction due to the contraction of the synthetic resin interposition member 64 from the expanded state and the pressing on the outer peripheral surface of the tube body 11a by fitting into the annular groove 60c. Exit is regulated. When the inner part 60a is inserted into the pipe main body 11a, the extension part 60d extends from the end surface of the pipe main body 11a. In order to connect the water pipe 11 having the end structure 10 to the joint 62, the extension 60 d is fitted into the connection tube 62 a of the joint 62. Then, the pair of seal members 17 are pressed against the inner peripheral surface of the connection cylinder portion 62a, and further press the inner peripheral surface of the connection cylinder portion 62a outward by the elastic force of the seal member 17 itself. Therefore, the end forming member 60 is connected to the connection cylinder portion 62a by the extending portion 60d, and the joint 62 and the water pipe 11 are connected.
[0087]
Therefore, by using the end forming member 60, the water pipe 11 can be easily connected to the joint 62, and the flow loss at the end of the pipe main body 11a can be reduced in the connected state. Moreover, the possibility of fluid leaking from between the end of the tube main body 11a and the annular groove 60c can be eliminated by the seal structure. The end forming member 60 is connected to the water pipe 11 to form the end structure 10. The water pipe 11 provided with the end structure 10 is carried into a construction site, and the joint 62 and the water pipe 11 are connected. May be. Further, the interposition member 64 may be omitted. In this case, the size of the annular groove 60c is adjusted so that only the tube main body 11a is fitted into the annular groove 60c. Further, instead of the interposition member 64, an elastic member such as a coil spring or a spring member may be interposed between the outer peripheral surface of the tube main body 11a and the inner peripheral surface of the annular groove 60c. In such a configuration, the elastic member presses both the outer peripheral surface of the pipe main body 11a and the inner peripheral surface of the annular groove 60c to restrict the water pipe 11 from coming out of the annular groove 60c. The water pipe 11 having the end structure 10 formed in advance may be carried into the construction site, and the water pipe 11 and the joint 62 may be connected at the construction site.
[0088]
-The joint 70 as a connecting body shown in Fig. 17 may be connected to the water pipe 11 in which the end structure 10 is formed using the ring body 13 of the first embodiment. The joint 70 will be described, but the up, down, left, and right in the following description correspond to up, down, left, and right in FIG. The joint 70 is used for connecting the water pipes 11 or as a part of a branch joint (header). The joint 70 has a substantially cylindrical joint body 71, a fixed sleeve 72, and a fixed sleeve 72. It is mainly formed of a ring 73 and a ring member 74.
[0089]
At both ends (only the left end is shown in FIG. 17) of the joint main body 71 formed in a substantially cylindrical shape from a synthetic resin material, connection tube portions 75 are formed. A first mounting surface 76 is formed on the inner peripheral surface at the back of each connection cylindrical portion 75, and on the inner peripheral surface of the connection cylindrical portion 75 located on the left side of the joint body 71 from the first mounting surface 76, A second mounting surface 77 having an inner diameter and an outer diameter larger than the first mounting surface 76 is formed. An O-ring 78 made of a rubber material is disposed on each of the first mounting surface 76 and the second mounting surface 77.
[0090]
A contact surface 79 having an inner diameter and an outer diameter larger than the second mounting surface 77 is formed on an inner peripheral surface of the connection cylinder portion 75 located on the left side of the joint body 71 with respect to the second mounting surface 77. . A male screw 80 is threaded on the outer peripheral surface of the connection tube 75. The fixing sleeve 72 is provided as an attachment forming a connecting means. The fixed sleeve 72 is formed in a substantially cylindrical shape from a synthetic resin material, and a female screw 72 a that can be screwed to the male screw 80 is threaded on the right inner peripheral surface of the fixed sleeve 72. Further, a locking surface 72b protruding inward is formed on the inner peripheral surface of the fixed sleeve 72. In addition, on the inner peripheral surface of the fixed sleeve 72 connected to the inner peripheral edge of the locking surface 72b, a tapered surface 72c whose diameter is reduced from the locking surface 72b side toward the left end of the fixed sleeve 72 is formed. I have. Further, a locking rib 72d is provided on the inner peripheral edge at the left end of the fixed sleeve 72 so as to protrude inward.
[0091]
The C-ring 73 is provided as an engagement body that forms a connection means, and the right end surface of the C-ring 73 is formed as an engagement portion that engages with the connection bulging portion 11b. The C ring 73 is formed in a C-shaped cross section by cutting a cylindrical body made of a synthetic resin material along the axial direction. The C ring 73 is formed in a tapered shape in which the outer diameter decreases from the right end to the left end. Further, the C-ring 73 is formed such that the right end face is engaged with the connection bulging portion 11b as an engaging portion when inserted into the connection tube portion 75. The ring member 74 is formed in an annular shape from a metal material, and in a state where the fixing sleeve 72 is screwed to the joint body 71, the right end abuts on the abutment surface 79, and the left end engages with the engagement surface 72b. And is held between the contact surface 79 and the locking surface 72b.
[0092]
When the ring member 74 is held between the contact surface 79 and the locking surface 72b, an O-ring 78 is formed between the inner peripheral edge of the ring member 74 and the second mounting surface 77. Is to be retained. Then, with the O-ring 78 placed on the first and second placement surfaces 76 and 77 and the ring member 74 placed on the contact surface 79, the fixed sleeve 72 in which the C-ring 73 is accommodated is placed. Is screwed into the joint body 71, the joint 70 is assembled. At this time, the left end surface of the C ring 73 is locked by the locking rib 72d of the fixed sleeve 72, and the C ring 73 is prevented from coming out of the fixed sleeve 72.
[0093]
Now, in order to connect the water pipe 11 formed with the connection bulging portion 11b and the joint 70, first, the fixed sleeve 72 is slightly withdrawn from the joint body 71, and the tapered surface 72c and the C ring 73 A gap is formed between the outer peripheral surface and the C ring 73 so that the diameter of the C ring 73 can be increased. Then, the connection bulging portion 11b side of the tube main body 11a is passed through the inside of the fixed sleeve 72 and inserted into the connection tube portion 75. Then, the end face of the pipe main body 11a comes into contact with the inner peripheral surface of the C ring 73, and further, the pipe main body 11a is inserted into the C ring 73, the C ring 73 is expanded in diameter, and the connection bulging portion 11b In the C-ring 73 is allowed.
[0094]
Then, the water pipe 11 is inserted into the joint 70 until the end surface of the pipe main body 11a comes into contact with the O-ring 78 placed on the first placement surface 76. At this time, the connection bulging portion 11 b is located on the inner side of the joint body 71 from the right end surface of the C-ring 73, and is disposed at a position corresponding to the ring member 74. Subsequently, when the fixed sleeve 72 is screwed into the connection cylinder portion 75, the tapered surface 72c is pressed against the outer peripheral surface of the C ring 73, and the diameter of the C ring 73 is gradually reduced. When the fixing sleeve 72 is screwed into the connection tube portion 75, the inner surface of the C ring 73 is pressed against the outer peripheral surface of the tube main body 11a, and the right end surface of the C ring 73 can be engaged with the bulging portion 11b for connection. Placed in the position. The O-ring 78 mounted on the first mounting surface 76 is pressed against the end surface of the tube main body 11a, and the O-ring 78 mounted on the second mounting surface 77 is mounted on the outer peripheral surface of the tube main body 11a. Crimp.
[0095]
As a result, the connection bulging portion 11b is engaged with the C-ring 73, and the C-ring 73 is housed so as not to be able to come out of the fixed sleeve 72. Therefore, the state where the connection bulging portion 11b is engaged with the C-ring 73 is maintained, the pipe main body 11a is prevented from coming off by the connection tube portion 75, and the water pipe 11 can be prevented from coming off from the joint 70.
[0096]
In addition, by accommodating the C-ring 73 in the joint 70, the connecting operation of the water pipe 11 can be performed in a state where the members forming the joint 70 are assembled. Therefore, for example, after attaching the fixing sleeve 72, the C ring 73, and the ring member 74 to the water pipe 11, respectively, assembling them to form the joint 70, and connecting the water pipe 11 with the water pipe 11, The connection work of the joint 70 can be simplified.
[0097]
In the above description, the connection operation of the water pipe 11 is performed in a state where the joint body 71, the fixing sleeve 72, the C-ring 73, and the ring member 74 are assembled. However, the following connection operation may be performed. That is, with the fixing sleeve 72 and the C-ring 73 previously attached to the water pipe 11 having the connecting bulging portion 11b formed therein, the connecting bulging portion 11b side is provided in the connecting tubular portion 75 in which the ring member 74 is accommodated. Insert Then, the fixing sleeve 72 may be screwed into the connection cylinder 75 to form the joint 70, and the water pipe 11 may be connected to the joint 70. In the joint 70, the joint body 71 and the fixed sleeve 72 may be formed of a metal material, and the ring member 74 may be formed integrally with the joint body 71. The C ring 73 is formed of a synthetic resin material.
[0098]
In each embodiment, the water pipe 11 is formed only of a synthetic resin material. However, the water pipe 11 made of a synthetic resin material may be provided with a metal layer within the thickness of the pipe body 11a. With this configuration, the metal layer can prevent oxygen from passing through the water pipe 11. Therefore, it is possible to prevent a problem that oxygen is contained in a fluid such as water flowing in the water pipe 11 and the oxygen causes the metal connection body to rust.
[0099]
In the diameter increasing jig 30, the inner peripheral shape of the main sleeve 31 may be formed in an octagonal or hexagonal cross section, and the head of the movable bolt 33 may be formed in an octagonal or hexagonal cross section. In this configuration, when the nut 35 is screwed into or out of the male screw 33c, the head of the movable bolt 33 and the inner peripheral surface of the main sleeve 31 interfere with each other, and the movable bolt 33 is connected to the main sleeve 31. It can be moved without rotating inside. Therefore, the engagement groove 33b for restricting the rotation of the movable bolt 33 and the engagement pin 38 can be omitted.
[0100]
-In each embodiment, you may use the ring member which wound and wound the wire in an annular shape as an inner body. With such a configuration, the inner body can be easily and inexpensively formed.
[0101]
In each embodiment, the end structure 10 is formed at one end of the water pipe 11, but the end structure 10 may be formed at both ends of the water pipe 11.
In each embodiment, the end structure 10 is formed by expanding the diameter of the water pipe 11 at the connection site between the connecting body and the water pipe 11. However, the end structure 10 is formed by expanding the diameter of the pipe body 11 a in advance. The drain pipe 11 may be formed in advance at a factory or the like. Then, at the connection site between the connection body and the water pipe 11, the water pipe 11 with the end structure 10 formed in advance and the connection body may be connected. At this time, after inserting the water pipe 11 into a sheath or the like that protects the outer surface of the water pipe 11, the water pipe 11 and the connector can be immediately connected. Therefore, in order to fit the fixing ring to the end of the pipe main body, the fixing ring is attached to the pipe main body, and after passing the fixing ring and the water pipe through the sheath, the water pipe and the connecting body are connected. Unlike the related art which has been necessary, the connection work between the water pipe 11 and the connecting body can be easily performed.
[0102]
In the first embodiment, the diameter of the ring 13 is increased by using the diameter expanding tool 21, but the diameter of the cylinder 26 may be expanded by using the diameter expanding tool 21 instead of the ring 13.
[0103]
In each of the embodiments, the inner body is enlarged in diameter, the connection bulge 11b is formed in the pipe main body 11a, and the water pipe 11 and the connection body are connected using the connection bulge 11b. Alternatively, the connecting pipe may be connected to the water pipe 11 having the end structure 10 by another connecting means without using the connecting bulging portion 11b.
[0104]
The water pipe 11 having the end structure 10 may be connected to a branch joint, a faucet device, or the like as a connecting body.
The diameter of the inner body may be expanded by using another tool of the diameter expanding tool 21 and the diameter expanding jig 30 used in each embodiment.
[0105]
Next, technical ideas that can be grasped from the above embodiment and other examples will be additionally described below together with their effects.
(1) The inner body protrudes outward from the outer surface of the pipe body due to the expansion of the diameter of the inner body, and the engaging portion of the connecting means provided on the connecting cylinder part of the connecting body engages to pull the pipe body into the connecting cylinder part. The method for forming an end structure of a water pipe according to claim 15, wherein a connection bulge portion is formed to be connected in a stopped state. With such a configuration, the connection between the pipe main body and the connecting body can be easily performed.
[0106]
(2) A connection structure between a water pipe and a connector formed to connect the water pipe having the end structure according to claim 6 to the connector in a state where the water pipe is prevented from falling off, wherein the pipe main body is provided. A connection structure between a water pipe having an end structure and a connection body, wherein the connection portion is formed by fitting an extension portion of a cylindrical body inserted into the connection cylinder portion. With such a configuration, the connection work between the pipe main body and the connection tube portion can be easily performed.
[0107]
【The invention's effect】
As described above in detail, according to the invention described in any one of claims 1 to 7, the load acting on the end portion at the time of expanding the diameter of the pipe main body is minimized, and the pipe main body is reduced. The flow loss at the end of the pipe main body can be reduced in the connection state between the pipe body and the connection body.
[0108]
According to the invention as set forth in any one of claims 8 to 14, the load acting on the end portion during the work of expanding the pipe main body is minimized, and the connection state between the pipe main body and the connection body is reduced. The water pipe having the end structure capable of reducing the flow loss at the end of the pipe body can be connected to the connecting body. In addition, the connection between the pipe body and the connection cylinder can be easily performed.
[0109]
According to the invention as set forth in claim 15, the load acting on the end of the pipe main body at the time of expanding the diameter of the pipe main body is minimized, and the flow loss at the end of the pipe main body in the connection state between the pipe main body and the connector. Can be formed.
[Brief description of the drawings]
FIG. 1 is a partial sectional side view showing a connection structure between a water pipe and a joint according to a first embodiment.
FIG. 2A is an exploded perspective view showing a water pipe and a joint according to the first embodiment, and FIG. 2B is a front view showing a state in which an engagement sleeve is divided into divided bodies.
FIG. 3A is a perspective view showing a diameter-enlargement tool, and FIG. 3B is a side sectional view showing the diameter-enlargement tool.
FIG. 4 is a side sectional view showing a state in which a diameter expanding tool is inserted into a pipe main body.
FIG. 5 is a partial side sectional view showing a connection structure between a water pipe and a joint according to a second embodiment.
FIG. 6 is an exploded perspective view showing a water pipe and a joint according to the second embodiment.
FIG. 7 is a perspective view showing a diameter expanding jig.
FIG. 8 is a side cross-sectional view showing a state where a cylindrical body and a pipe main body are mounted on an enlarged diameter shaft.
FIG. 9 is a side sectional view showing a state where the diameter of the pipe main body is expanded by a diameter expanding jig.
FIG. 10 is a side sectional view showing a connection structure between a water pipe and a joint according to a third embodiment.
FIG. 11 is an exploded perspective view showing a water pipe and a joint according to a third embodiment.
FIG. 12 is a front view showing a connection state between the joint main body and the water pipe;
FIG. 13 is a side sectional view showing a connection structure between another example of a joint and a water pipe.
FIG. 14 is a side sectional view showing a connection member and a water pipe of another example of the inner body.
FIG. 15 is a side sectional view showing a state in which another example of the inner body is connected to a water pipe.
FIG. 16 is a partial side sectional view showing a connection structure between another example of a joint and a water pipe.
FIG. 17 is a partial sectional side view showing a connection structure between a joint and a water pipe according to another example.
FIG. 18 is a partial sectional side view showing a conventional connection structure between a water pipe and a joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... End structure, 11 ... Water pipe, 11a ... Pipe main body, 11b ... Connection bulging part, 12, 25, 40, 62, 70 ... Joint as connection body, 13 ... Ring body as inner body, 14 , 27a, 41a, 62a, 75 ... connecting cylinder, 19 ... engaging sleeve as engaging body, 19a ... split body, 19b ... engaging concave streak as engaging part, 20, 72 ... fixing as attaching body Sleeve 26, cylindrical body as inner body, 26a extended part as fixed part, 28 removal prevention sleeve, 42 pin body as attachment body, 43 split ring as engagement body, 54 inner A connecting member as a body, 54b a connecting flange as a fixing portion, 60a an inner portion as an inner body, 60d an extending portion as a fixing portion, 73 a C-ring as an engaging body.

Claims (15)

合成樹脂材料製の通水管の管本体の端部における流量損失を小さくするために、当該管本体の端部に形成される通水管の端部構造であって、
前記管本体の端部の内側に挿入された環状をなす金属材料製のインナー体が、当該インナー体の内径と、非拡径部分の管本体の内径とがほぼ同一となるように内側から拡径されていることを特徴とする通水管の端部構造。In order to reduce the flow loss at the end of the pipe body of the synthetic resin material water pipe, the end structure of the water pipe formed at the end of the pipe body,
An annular inner body made of a metal material inserted inside the end of the pipe main body is expanded from the inside such that the inner diameter of the inner body and the inner diameter of the pipe main body in the non-expanded portion are substantially the same. The end structure of a water pipe characterized by having a diameter. 前記インナー体の拡径により管本体の外面から外方へ突出し、接続体の接続筒部に設けられる接続手段の係合部が係合して管本体を接続筒部に抜け止めした状態に接続する接続用膨出部が形成されていることを特徴とする請求項１に記載の通水管の端部構造。The inner body protrudes outward from the outer surface of the pipe body by the expansion of the diameter of the inner body, and is connected to a state in which the engaging portion of the connecting means provided on the connecting cylinder part of the connecting body is engaged so that the pipe body is prevented from coming off the connecting cylinder part. The end structure of the water pipe according to claim 1, wherein a bulging portion for connection is formed. 前記インナー体は環状のリング体により形成されていることを特徴とする請求項１又は請求項２に記載の通水管の端部構造。The end structure of a water pipe according to claim 1 or 2, wherein the inner body is formed by an annular ring body. 前記インナー体は線材を環状に巻回して形成されていることを特徴とする請求項１又は請求項２に記載の通水管の端部構造。3. The end structure of a water pipe according to claim 1, wherein the inner body is formed by winding a wire in an annular shape. 4. 前記インナー体は筒体により形成されていることを特徴とする請求項１又は請求項２に記載の通水管の端部構造。The end structure of a water pipe according to claim 1 or 2, wherein the inner body is formed of a cylindrical body. 前記インナー体は筒体により形成され、管本体内への挿入状態において、管本体の端面から延出する延出部を備え、当該延出部は管本体を接続体に接続するための固定部であることを特徴とする請求項１に記載の通水管の端部構造。The inner body is formed of a cylindrical body, and includes an extending portion extending from an end surface of the tube main body in a state of being inserted into the tube main body, and the extending portion is a fixing portion for connecting the tube main body to a connecting body. The end structure of a water pipe according to claim 1, wherein: 請求項１〜請求項６のいずれか一項に記載の端部構造が管本体の一端又は両端に設けられていることを特徴とする端部構造を備えた通水管。A water pipe provided with an end structure, wherein the end structure according to any one of claims 1 to 6 is provided at one end or both ends of a pipe main body. 請求項２〜請求項５のいずれか一項に記載の端部構造を備えた通水管を、接続体に抜け止めした状態で接続するために形成される通水管と接続体との接続構造であって、前記管本体の接続用膨出部と、接続筒部に設けられた接続手段の係合部との係合により形成されていることを特徴とする端部構造を備えた通水管と接続体との接続構造。A connection structure between a water pipe and a connector formed to connect the water pipe having the end structure according to any one of claims 2 to 5 to the connector in a state where the water pipe is prevented from falling off. A water pipe having an end structure, which is formed by engagement of a connection bulging portion of the pipe main body with an engagement portion of a connection means provided on a connection cylinder portion; Connection structure with connection body. 前記接続手段は、接続筒部に螺合して取り付けられ、その取付状態で接続用膨出部に係合する係合部を備えた抜脱防止スリーブにより形成されていることを特徴とする請求項８に記載の端部構造を備えた通水管と接続体との接続構造。The connection means is formed by a detachment prevention sleeve which is screwed and attached to the connection cylinder portion and has an engagement portion which engages with the connection bulging portion in the attached state. Item 10. A connection structure between a water pipe having the end structure according to Item 8 and a connection body. 前記接続手段は、係合部を備えた係合体と、当該係合体と接続用膨出部との係合を維持すべく接続筒部に取り付けられる取着体とにより形成されていることを特徴とする請求項８に記載の端部構造を備えた通水管と接続体との接続構造。The connecting means is formed by an engaging body provided with an engaging portion, and an attaching body attached to the connecting tubular portion to maintain the engagement between the engaging body and the connection bulging portion. A connection structure between a water pipe having the end structure according to claim 8 and a connection body. 前記取着体は、前記係合体を内部に保持して接続筒部に螺合して取り付けられる固定スリーブにより形成されていることを特徴とする請求項１０に記載の端部構造を備えた通水管と接続体との接続構造。The through-hole provided with an end structure according to claim 10, wherein the attachment body is formed by a fixing sleeve which holds the engagement body inside and is screwed and attached to a connection cylinder portion. Connection structure between water pipe and connector. 前記固定スリーブは、管本体の接続用膨出部が形成された端部側から同接続用膨出部の外側を通過して管本体に装着されることを特徴とする請求項１１に記載の端部構造を備えた通水管と接続体との接続構造。12. The fixing sleeve according to claim 11, wherein the fixing sleeve is attached to the pipe main body from an end of the pipe main body where the connecting bulging part is formed, passing outside the connecting bulging part. A connection structure between a water pipe having an end structure and a connector. 前記係合体は複数の分割体を組付けることにより形成され、前記接続用膨出部の形成後に、当該接続用膨出部に係合して取り付けられることを特徴とする請求項１０〜請求項１２のいずれか一項に記載の端部構造を備えた通水管と接続体との接続構造。The said engaging body is formed by assembling a some division | segmentation body, and after forming the said bulging part for a connection, it is engaged and attached to the said bulging part for a connection, The claim 10 characterized by the above-mentioned. A connection structure between a water pipe having the end structure according to claim 12 and a connection body. 前記取着体は、接続筒部内に挿入された係合体の同接続筒部内からの抜脱を防止すべく接続筒部に取着されるピン体により形成されていることを特徴とする請求項１０に記載の端部構造を備えた通水管と接続体との接続構造。The said attachment body is formed by the pin body attached to a connection cylinder part so that the engagement body inserted in the connection cylinder part may prevent withdrawal from the inside of the connection cylinder part. A connection structure between a water pipe having the end structure according to claim 10 and a connection body. 合成樹脂材料製の通水管の管本体の端部における流量損失を小さくするための端部構造を、当該管本体に形成する方法であって、前記管本体の端部の内側に環状をなす金属材料製のインナー体を挿入し、同インナー体を、当該インナー体の内径と、非拡径部分の管本体の内径とがほぼ同一となるように内側から拡径することを特徴とする通水管の端部構造の形成方法。A method for forming an end structure for reducing a flow loss at an end of a pipe body of a synthetic resin material water flow pipe in the pipe body, wherein a metal having an annular shape is formed inside the end of the pipe body. A water inner pipe, wherein an inner body made of a material is inserted, and the inner body is expanded from the inside so that the inner diameter of the inner body and the inner diameter of the pipe body of the non-expanded portion are substantially the same. Of forming the end structure.
JP2002362315A 2001-12-25 2002-12-13 Connection structure between water pipe and connector Expired - Fee Related JP4245127B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2002362315A JP4245127B2 (en) 2001-12-27 2002-12-13 Connection structure between water pipe and connector
KR10-2004-7010049A KR20040071251A (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
CN028260414A CN100406797C (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structu
EP02793380A EP1460324A4 (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
PCT/JP2002/013509 WO2003056227A1 (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
AU2002360021A AU2002360021A1 (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
US10/499,836 US7350831B2 (en) 2001-12-25 2004-06-18 End structure of water pipe

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001398470 2001-12-27
JP2002347704 2002-11-29
JP2002362315A JP4245127B2 (en) 2001-12-27 2002-12-13 Connection structure between water pipe and connector

Publications (2)

Publication Number Publication Date
JP2004225711A true JP2004225711A (en) 2004-08-12
JP4245127B2 JP4245127B2 (en) 2009-03-25

Family

ID=32912769

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002362315A Expired - Fee Related JP4245127B2 (en) 2001-12-25 2002-12-13 Connection structure between water pipe and connector

Country Status (1)

Country Link
JP (1) JP4245127B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008516159A (en) * 2004-10-07 2008-05-15 ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト Connecting device for connecting the conduit to the system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008516159A (en) * 2004-10-07 2008-05-15 ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト Connecting device for connecting the conduit to the system
KR101247877B1 (en) * 2004-10-07 2013-03-26 섀플러 테크놀로지스 아게 운트 코. 카게 Joining Arrangement for Connecting a Pipe to a Hydraulic Clutch Disengagement System

Also Published As

Publication number Publication date
JP4245127B2 (en) 2009-03-25

Similar Documents

Publication Publication Date Title
CA1073497A (en) Quick connect coupling
JP4145123B2 (en) Fitting
US7350831B2 (en) End structure of water pipe
JP4939826B2 (en) How to assemble pipe fittings
US20080129045A1 (en) Water pipe end structure and connection therefor
JP5269178B2 (en) How to assemble pipe fittings
JP3086898B2 (en) Pipe fittings
JP2004225711A (en) End structure for water pipe, water pipe with end structure, water pipe-to-connector connection structure, and water pipe end structure forming method
JP4066397B2 (en) Tube connection method
JP2002295756A (en) Simplified swivel hose joint
JP2000088157A (en) Pipe body connection structure
JP3219074B2 (en) Hose fittings
JPH11173472A (en) Joint structure
JP2009287646A (en) Pipe joint
JP4198453B2 (en) End structure of water pipe, water pipe having the same end structure, connection structure between water pipe and connecting body, and method of forming end structure of water pipe
JP3041477B2 (en) Pipe connection device
JP2007263146A (en) Pipe joint
JP4722770B2 (en) Pipe fitting
JP4081165B2 (en) Plastic pipe fittings
JP4343595B2 (en) Connection structure between fluid pipe and connector
JP2000088163A (en) Pipe body connection structure
JP2000074274A (en) Pipe body connecting structure
JP2000310379A (en) Joint
JP3665847B2 (en) Structure that seals the connection end of the synthetic resin tube in an airtight or liquid tight manner
JP2004225713A (en) Water pipe connection end, water pipe with connection end, connection structure for water pipe with inner element to form connection end and connection end to connector, and water pipe connection end forming method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050518

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080527

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080725

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080902

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20081104

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20081224

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090105

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120116

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120116

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120116

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees