JP3907841B2

JP3907841B2 - Housing type pipe fitting

Info

Publication number: JP3907841B2
Application number: JP20685798A
Authority: JP
Inventors: 田信太郎池; 下晃規坂
Original assignee: Victaulic Co of Japan Ltd
Current assignee: Victaulic Co of Japan Ltd
Priority date: 1997-12-25
Filing date: 1998-07-22
Publication date: 2007-04-18
Anticipated expiration: 2018-07-22
Also published as: JPH11241794A

Description

【０００１】
【発明の属する技術分野】
本発明は、２つの管の突き合わせた端をシールするとともに、２つの管を確実に固定するのに使用するハウジング形管継手に関する。
【０００２】
【従来の技術】
管端をシールするハウジング形管継手として、図１４に示す構成のハウジング形管継手が多くの産業で使用されている。
上記ハウジング形管継手は、一対の円弧状継手セグメント１，２と、各円弧状継手セグメントに形成されたそれぞれ周方向溝３を有する２つの管４，５の端部を収容する空間６と、この空間６に２つの管４，５の端部をシールするように設けられる弾性リング７と、上記空間６の両側で半径方向内方に延びて収容される２つの管４，５の各周方向溝３に係合する２つの締付部８，９と、一対の継手セグメント１，２を互いに結合するための取付手段１０とから形成されている。
【０００３】
上記ハウジング形管継手は、一対の円弧状継手セグメント１，２の空間６，６に配置される弾性リング７で２つの管４，５の端部外周面に圧接することで２つの管４，５の端部をシールするとともに、各継手セグメント１，２に設けた締付部８，９を２つの管４，５の端部に設けた周方向溝３の底部に圧接して２つの管４，５を円弧状継手セグメント１，２に固定するようにしている。
【０００４】
【発明が解決しようとする課題】
上記ハウジング形管継手は、各継手セグメントに設けた締付部を、締付部の端部が管に設けた周方向溝の底部に圧接するような寸法にしなければならないが、使用する管の公称直径が同じであって実質的には管の直径に差があり、管の周方向溝の深さにも差が生じ、したがって、締付部による管の圧接力に差が生じ、締付部による管の固定が弱くなり、２つの管の端部を確実に固定することできず、２つの管の端部が、継手部分で伸びたり、縮んだり、あるいは曲がったりする現象が生じるという問題がある。
また、上記ハウジング形管継手では、一対の円弧状継手セグメントの合口部がメタルタッチする構造であるから、管の外径公差および円弧状継手セグメントの製作寸法公差の関係で、管を締め付ける途中の段階で、円弧状継手セグメント同士がメタルタッチしてしまい、締付部で２つの管の端部を確実に固定することできないことがある。
【０００５】
本発明は上記した点に鑑みてなされたもので、管の周方向溝の深さに差があっても、２つの管の端部を確実に固定できるハウジング形管継手を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明のハウジング形管継手は、一対の円弧状継手セグメントと、各円弧状継手セグメントに形成された一対の管の端部および弾性リングを収容するための空間と、この空間の両側に設けられそれぞれの管の周方向溝に係合する一対の締付部と、円弧状継手セグメントの両端面に設けられた印籠結合部と、一対の円弧状継手セグメントを互いに結合するための取付手段とを有し、上記印籠結合部は、同じ幅の凸状係合部と凹状係合部を有し一方の印籠結合部の凸状係合部と他方の印籠結合部の凹状係合部が互いに対向するように配置され、上記締付部の一方は、一端面に設けられた印籠結合部の凸状係合部に隣接して接合面から約４５度の角度位置まで連続して延び一方の管の周方向溝の管端に遠い側壁に当接する突条と他端面に設けた印籠結合部の凹状係合部に隣接して接合面から約４５度の角度位置まで連続して延び一方の管の周方向溝の管端に近い側壁に当接する突条を有し、上記締付部の他方は、一端面に設けた印籠結合部の凹状係合部に隣接して接合面から約４５度の角度位置まで連続して延び他方の管の周方向溝の管端に近い側壁に当接する突条と他端面に設けた印籠結合部の凸状係合部に隣接して接合面から約４５度の角度位置まで連続して延び他方の管の周方向溝の管端に遠い側壁に当接する突条を有することを特徴とする。
本発明のハウジング形管継手は、一対の円弧状継手セグメントと、各円弧状継手セグメントに形成された一対の管の端部および弾性リングを収容するための空間と、上記空間の両側に設けられそれぞれの管の周方向溝に係合する一対の締付部と、円弧状継手セグメントの両端面に設けられた印籠結合部と、一対の円弧状継手セグメントを互いに結合するための取付手段とを有し、上記印籠結合部は、同じ幅の凸状係合部と凹状係合部を有し一方の印籠結合部の凸状係合部と他方の印籠結合部の凹状係合部が互いに対向するように配置され、上記締付部の一方は、一端面に設けられた印籠結合部の凸状係合部に隣接して接合面から約４５度の角度位置まで連続して延び外側面を一方の管の周方向溝の管端に遠い側壁に当接する締付部分と他端面に設けられた印籠結合部の凹状係合部に隣接して接合面から約４５度の角度位置まで連続して延び内側面を一方の管の周方向溝の管端に近い側壁に当接する締付部分を有し、上記締付部の他方は、一端面に設けた印籠結合部の凹状係合部に隣接して接合面から約４５度の角度位置まで連続して延び内側面を他方の管の周方向溝の管端に近い側壁に当接する締付部分と他端面に設けた印籠結合部の凸状係合部に隣接して接合面から約４５度の角度位置まで連続して延び外側面を他方の管の周方向溝の管端に遠い側壁に当接する締付部分を有することを特徴とする。
【０００７】
【発明の実施の形態】
以下本発明の実施の形態を図面につき説明する。
図１において符号２０は、本発明によるハウジング形管継手の対をなす円弧状継手セグメントの一方の円弧状継手セグメント２０を示す。対をなす円弧状継手セグメント２０，２０ａは同一構成であるから、一方の円弧状継手セグメント２０についてのみ説明する。
【０００８】
上記円弧状継手セグメント２０は、図１ないし図４に示すように、両端面に印籠結合部２１を有する。印籠結合部２１は、円弧状継手セグメント２０の幅のほぼ半分の幅の凸状係合部２２ａとほぼ半分の幅の凹状係合部２２ｂから構成されている。両端面に設けられた印籠結合部２１，２１は、一方の印籠結合部の凸状係合部２２ａおよび凹状係合部２２ｂが他方の印籠結合部の凹状係合部２２ｂおよび凸状係合部２２ａに対向するように配置される。
上記円弧状継手セグメント２０と円弧状継手セグメント２０ａは、図３および図４に示すように、互いに近ずく方向に動かすことで印籠結合され、ボルトナットのような通常の取付手段１０により一体的に結合される。
【０００９】
上記円弧状継手セグメント２０は、図１ないし図３に示すように、周方向溝３を設けた管４，５の端部およびこれら管４，５の端部を囲む弾性リング７を収容する空間２３を有する。上記空間２３の一側には空間２３の一方の側壁から半径方向内方に延びる締付部２４が形成されている。締付部２４は、図３に示すように、一方の管４の端部に設けた周方向溝３に嵌合して管４の端部を円弧状継手セグメント２０に固定する。上記空間２３の他側にも空間２３の他方の側壁から半径方向内方に延びる締付部２５が形成されている。締付部２５は、図３に示すように、他方の管５の端部に設けた周方向溝３に嵌合して管５の端部を円弧状継手セグメント２０に固定する。
【００１０】
上記締付部２４は、周方向一端側（図２において上方側）から周方向他端側（図２において下方側）まで同じ曲率半径の端面を有する。締付部２４は、図１および図２に示すように、周方向一端側に内方に突出して一方の管４の端部に設けた周方向溝３の管端に近い側壁３ａに当接する円弧状突条２６と、周方向他端側に外方に突出して一方の管４の周方向溝３の管端に遠い側壁３ｂに当接する円弧状突条部２７を有する。円弧状突条２６および円弧状突条２７は、接合面３０から約４５度の位置まで連続して延びている。円弧状突条２６および円弧状突条２７の管の側壁への当接面は、管の軸線に直交する面に平行な面である。
【００１１】
上記締付部２５は、上記締付部２４と同様に、周方向一端側（図２において上方側）から周方向他端側（図２において下方側）まで同じ曲率半径の端面を有する。締付部２５は、図１および図２に示すように、周方向一端側に外方に突出して他方の管５の端部に設けた周方向溝３の管端に遠い側壁３ｂに当接するる円弧状突条２８と、周方向他端側に内方に突出して他方の管５の端部に設けた周方向溝３の管端に近い側壁３ａに当接する円弧状突条２９を有する。上記円弧状突条２８および円弧状突条２９も上記円弧状突条２６および円弧状突条２７と同様に接合面３０から約４５度まで延び、管の側壁への当接面は管の軸線に直交する面に平行な面である。
【００１２】
締付部２４に設けた外方に突出する円弧状突条部２７および締付部２５に設けた外方に突出する円弧状突条部２８は、図１および図２に示すように、各印籠結合部２１の凸状係合部２２ａ側に位置し、締付部２４に設けた内方に突出する円弧状突条部２６および締付部２５に設けた内方に突出する円弧状突条部２９は、各印籠結合部２１の凹状係合部２２ｂ側に位置している。
【００１３】
円弧状継手セグメント２０と円弧状継手セグメント２０ａは、図５（ａ）に示すように、対向配置された一方の印籠結合部２１の凹状係合部２２ｂと凸状係合部２２ａが他方の印籠結合部２１の凹状係合部２２ｂと凸状係合部２２ａに嵌合することで印籠結合される。
【００１４】
つぎに、ハウジング形管継手の組み立て手順について説明する。
ハウジング形管継手に一対の管４，５の端部を固定する準備段階として、管４と管５を弾性リング７の両側から端部同士が突き合わすように装着し流体密シール組立て体を形成する。
【００１５】
つぎに、上記組立て体を円弧状継手セグメント２０に弾性リング７が空間２３に入るように配置する。図５（ａ）では、説明を明瞭にするために弾性リングを省略している。
【００１６】
つぎに、他方の円弧状継手セグメント２０ａを、図５（ａ）で示すように、凹状係合部２２ｂと凸状係合部２２ａが円弧状継手セグメント２０の凸状係合部２２ａ凹状係合部２２ｂに対応するように円弧状継手セグメント２０に対向配置し、円弧状継手セグメント２０と円弧状継手セグメント２０ａを互いに近付く方向に押圧して凹状係合部２２ｂに凸状係合部２２ａを嵌合する。
【００１７】
円弧状継手セグメント２０と円弧状継手セグメント２０ａの嵌合前の段階では、図５（ａ）に示すように、円弧状継手セグメント２０の締付部２４は、円弧状突条２６側で管４の周方向溝３の底面に接触し、円弧状突条２７側で管４の周方向溝３の底面から浮き、円弧状継手セグメント２０の締付部２５は、円弧状突条２９側で管５の周方向溝３の底面に接触し、円弧状突条２８側で管５の周方向溝３の底面から浮き、締付部２４の円弧状突条２６および２７と締付部２５の円弧状突条２８および２９は、それぞれ管４および５の周方向溝３の側壁３ａに対して間隔を置いた遊んだ位置にある。
円弧状継手セグメント２０ａについては、図５（ｂ）では示されていないが、円弧状継手セグメント２０ａの締付部２４ａ，２５ａは、円弧状継手セグメント２０の締付部２４，２５と逆の作用をするように位置される。
【００１８】
ついで、円弧状継手セグメント２０と円弧状継手セグメント２０ａは、図６に示すボルトナットのような通常の取付手段１０により一体的に結合される。円弧状継手セグメント２０と円弧状継手セグメント２０ａが結合されると、図６（ａ）に示すように、円弧状継手セグメント２０に設けた印籠結合部２１と円弧状継手セグメント２０ａに設けた印籠結合部２１が嵌合し、円弧状継手セグメント２０と円弧状継手セグメント２０ａは印籠結合される。
【００１９】
円弧状継手セグメント２０と円弧状継手セグメント２０ａが嵌合した段階では、円弧状継手セグメント２０は、図６（ｂ）で矢印で示す方向に揺動し、図示しない円弧状継手セグメント２０ａは、矢印と反対の方向に揺動する。
【００２０】
円弧状継手セグメント２０と円弧状継手セグメント２０ａが結合されると、円弧状継手セグメント２０においては、図６（ｂ）で示すように、締付部２４の円弧状突条２６が管４の周方向溝３の管端に近い側壁３ａに当接して管４を矢印で示す管端方向に押圧し、締付部２４の円弧状突条２７が管４の周方向溝３の管端に遠い側壁３ｂに当接して管４を矢印で示す管端と反対の方向に押圧する。これと同時に、締付部２５の円弧状突条２８が管５の周方向溝３の管端に遠い側壁３ｂに当接して管５を矢印で示す管端と反対の方向に押圧し、円弧状突条２９が管５の周方向溝３の管端に近い側壁３ａに当接して管５を矢印で示す管端方向に押圧する。
【００２１】
円弧状継手セグメント２０ａは、円弧状継手セグメント２０と反対方向の動きをし、円弧状継手セグメント２０ａにおいては、締付部２４ａに設けた円弧状突条２６ａ，２７ａおよび締付部２５ａに設けた円弧状突条２８ａ，２９ａが、円弧状継手セグメント２０の締付部２４に設けた円弧状突条２６，２７および締付部２５に設けた円弧状突条２８，２９と対称に同様に作用する。
【００２２】
円弧状継手セグメント２０の締付部２４に設けた円弧状突条２６および円弧状突条２７および円弧状継手セグメント２０ａの締付部２４ａに設けた円弧状突条２６ａと円弧状突条２７ａは、それぞれ接合面３０から約４５度の角度位置まで連続して延びている。
【００２３】
ここで、図７に示すように、管の断面をリングと考えると、リング３０は、周方向に４５度の間隔を置いた点ａ，ｂ，ｃ，ｄの４点で支持されることになり、ａとｃがリング３０を上から押さえ、ｂとｄがリング３０を下から押さえることになる。そのため、リング３０は、中心ｏを通るＸ−Ｘ線およびこのＸ−Ｘ線に直交するＹ−Ｙ線に対してそれぞれ４５度の角度位置で均等に支持され、管がどの方向に曲がろうとしても、ａ，ｂ，ｃ，ｄの４点がこれに均等に受け、管が確実に固定されることになる。
【００２４】
このように、ハウジング形管継手は、一対の管４，５の端部に設けた周方向溝３，３の底面および側壁を締付部により押圧するので、一対の管４，５の端部は確実に固定され、一対の管４，５の端部が継手部分において伸びたり、縮んだり、あるいは軸線方向に対して曲がったりすることがなく、空間２３に収容された弾性リング７のねじれも防ぐことができる。
【００２５】
なお、上記実施の態様では、ハウジング形管継手は、管の端部に設けた周方向溝の底面および側壁を締付部により押圧するようにしているが、締付部で管の外周面および側壁を押圧するようにしてもよい。締付部で管の外周面および側壁を押圧することで、管の端部に設けた周方向溝の深さに関係なく、管と空間２３の底面との距離を一定に設定でき、空間２３に配置される弾性リング７の締め付け量を一定にすることができる。
【００２６】
図８および図９は、本発明によるハウジング形管継手の第２の実施の形態の円弧状継手セグメント１２０を示す。円弧状継手セグメント１２０と円弧状継手セグメント１２０ａは、同一構成であるから、一方の円弧状継手セグメント１２０についてのみ説明する。
【００２７】
上記円弧状継手セグメント１２０は、図１に示す円弧状継手セグメント２０と比較すると、締付部の構成において相違し、他の部分は同一構成である。
【００２８】
上記円弧状継手セグメント１２０は、図８ないし図１０に示すように、空間１２３の一側で一方の接合面１３０Ａから約４５度の位置まで半径方向内方に円弧状に延びる締付部１２４Ａと、空間１２３の一側で他方の接合面１３０Ｂから約４５度の位置まで半径方向内方に円弧状に延びる締付部１２４Ｂと、空間１２３の他側で一方の接合面１３０Ａから約４５度の位置まで半径方向内方に円弧状に延びる締付部１２５Ａと、空間１２３の他側で他方の接合面１３０Ｂから約４５度の位置まで半径方向内方に円弧状に延びる締付部１２５Ｂを有する。
【００２９】
上記締付部１２４Ａは、空間１２３に対向する内側面に内方に突出して一方の管５の周方向溝３の管端に近い側壁３ａに圧接する係合面１２６を有する。締付部１２４Ｂは、空間１２３と反対側の外側面に外方に突出して一方の管５の周方向溝３の管端に遠い側壁３ｂに圧接する係合面１２７を有する。締付部１２５Ａは、空間１２３と反対側の外側面に外方に突出して他方の管４の周方向溝３の管端に遠い側壁３ｂに圧接する係合面１２８を有する。締付部１２５Ｂは、空間１２３に対向する内側面に内方に突出して他方の管４の周方向溝３の管端に近い側壁３ａに圧接する係合面１２９を有する。
【００３０】
上記各印籠結合部１２１は、図８に示すように、凸状係合部１２２ａの嵌合端側の内側隅部を丸くした凸面１４０としている。これにより、円弧状継手セグメント１２０と円弧状継手セグメント１２０ａは、凸状係合部１２２ａ同士が強く当たることなく滑らかに印籠結合される。
【００３１】
上記円弧状継手セグメント１２０の幅Ｗは、図１１に示すように、２つの管４，５を端面で当接した場合における２つの管４，５の周方向溝３，３の管端に遠い側壁３ｂ，３ｂの間隔Ｌより狭く設定されている。これは、２つの管４，５を縦方向に配管する場合に、上側に位置する管５を押し上げることなく円弧状継手セグメント１２０，１２０ａを２つの管４，５に容易に嵌め込まれる。
【００３２】
つぎに、ハウジング形管継手を縦方向に配列した２つの管４，５に組み立てる手順について説明する。
まず、一方の管４を垂直方向に配置し、この管４の管端に弾性リング（図６）を装着する。ついで、管４の上側に他方の管５を配置し、管５を管４の方向に移動し、管５の管端を管４に装着された弾性リングに嵌入する。説明の便宜のために図１１では弾性リングは省略されている。
【００３３】
２つの管４，５は、管端を突き合わせた状態に配置されたことで、２つの管４，５の周方向溝３，３の管端に遠い側壁３ｂ，３ｂの間に間隔Ｌが形成される。この間隔Ｌは、円弧状継手セグメント１２０の幅Ｗより広く設定されている。
【００３４】
つぎに、円弧状継手セグメント１２０，１２０ａを、図１２に示すように、２つの管４，５の端部を挟持するように対向配置する。円弧状継手セグメント１２０と円弧状継手セグメント１２０ａは同一形状であり、一方の印籠結合部１２１の凹状係合部１２２ｂと凸状係合部１２２ａが他方のの印籠結合部１２１の凸状係合部１２２ａと凹状係合部１２２ｂに嵌合される。円弧状継手セグメント１２０と円弧状継手セグメント１２０ａは、通常のボルトナット取付手段１０（図６）により一体的に結合される。
【００３５】
円弧状継手セグメント１２０と円弧状継手セグメント１２０ａは、図１２で示す嵌合途中の段階では、印籠結合部２１の凸状係合部１２２ａ同士が軽く接触した状態にあり、２つの管４，５の周方向溝３，３の間隔Ｌの間に傾斜して配置される。
ついで、円弧状継手セグメント１２０と円弧状継手セグメント１２０ａが、図１２で矢印で示す方向に取付手段１０により締め付けられると、円弧状継手セグメント１２０と円弧状継手セグメント１２０ａは、２つの管４，５の表面に沿って滑り、円弧状継手セグメント１２０の凸状係合部１２２ａと凹状係合部１２２ｂが円弧状継手セグメント１２０ａの凹状係合部１２２ｂと凸状係合部１２２ａに嵌合される。
【００３６】
円弧状継手セグメント１２０は、図１２で示すように、ボルトナット取付手段１０のねじ締めにより矢印Ａ方向に回動し、円弧状継手セグメント１２０ａは、図１２で示すように、ボルトナット取付手段１０のねじ締めにより矢印Ｂ方向に回動する。この場合、締付部１２４Ｂに設けた外方に突出する係合面１２７および締付部１２５Ａに設けた外方に突出する係合面１２８は、印籠結合部１２１の凸状係合部１２２ａに近い側に位置するので、ボルトナット取付手段１０のねじ締め方向と同じ方向に回動する。
【００３７】
円弧状継手セグメント１２０と円弧状継手セグメント１２０ａの印籠結合が完了した段階では、図１３に示すように、円弧状継手セグメント１２０に設けた印籠結合部１２１の凸状係合部１２２と円弧状継手セグメント１２０ａに設けた印籠結合部１２１の凸状係合部１２２ａは、互いに側面で圧接し、締付部１２４Ｂの係合面１２７と締付部１２５Ａの係合面１２８に矢印で示す方向の力が作用し、これにより、上側の管５が下側の管４から離れる方向に移動し、２つの管４，５の周方向溝３，３の側壁３ａ，３ａの間隔は、ＬからＬ´に広がる。そのため、締付部１２４Ｂの係合面１２７と締付部１２５Ａの係合面１２８が、管４，５の周方向溝３，３の側壁３ａ，３ａを圧接するので、管を動かす外力が作用しても、円弧状継手セグメント１２０と円弧状継手セグメント１２０ａが横ずれすることがなく、管４，５に対する固定力が強化されることになる。
【００３８】
【発明の効果】
以上述べたように本発明によれば、締付部の側面に設けた突条または係合面を管の周方向溝の側壁に圧接することで管と管を確実に固定することができ、また、円弧状継手セグメントに製造誤差があっても、製造誤差に影響を受けることなく管の相対的な移動や回動を防ぐことができる。
【図面の簡単な説明】
【図１】本発明によるハウジング形管継手の円弧状継手セグメントの斜視図。
【図２】図１に示す円弧状継手セグメントの一部を切り欠いて示す展開図。
【図３】一対の円弧状継手セグメントを印籠結合した状態を示すハウジング形管継手の正面図。
【図４】図３のハウジング形管継手の側面図。
【図５】本発明によるハウジング形管継手の締め付け前の段階を示す図。
【図６】本発明によるハウジング形管継手の締め付け後の段階を示す図。
【図７】本発明によるハウジング形管継手の管に対する作用点を示す図。
【図８】本発明によるハウジング形管継手の第２の実施の形態の円弧状継手セグメントを一側から見た斜視図。
【図９】本発明によるハウジング形管継手の第２の実施の形態の円弧状継手セグメントを他側から見た斜視図。
【図１０】本発明によるハウジング形管継手の第２の実施の形態の円弧状継手セグメントの一部を切り欠いて示す展開図。
【図１１】ハウジング形管継手と一対の管に設けた周方向溝との関係を示す図。
【図１２】本発明による第２の実施の形態のハウジング形管継手の締め付け前の段階を示す図。
【図１３】本発明による第２の実施の形態のハウジング形管継手の締め付け後の段階を示す図。
【図１４】従来のハウジング形管継手の分解斜視図。
【符号の説明】
３周方向溝
３ａ，３ｂ側壁
４管
５管
２０円弧状継手セグメント
２１印籠結合部
２２ａ凸状係合部
２２ｂ凹状係合部
２４締付部
２５締付部
２６突条
２７突条
２８突条
２９突条
１２４Ａ，１２４Ｂ締付部
１２５Ａ，１２５Ｂ締付部
１２６係合面
１２７係合面
１２８係合面
１２９係合面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a housing-type fitting that seals the butted ends of two tubes and is used to securely fix the two tubes.
[0002]
[Prior art]
As a housing-type pipe joint that seals the pipe end, a housing-type pipe joint having the structure shown in FIG. 14 is used in many industries.
The housing-type pipe joint includes a pair of arc-shaped joint segments 1 and 2 and a space 6 that accommodates ends of two pipes 4 and 5 each having a circumferential groove 3 formed in each arc-shaped joint segment; An elastic ring 7 provided so as to seal the ends of the two pipes 4 and 5 in the space 6, and each circumference of the two pipes 4 and 5 accommodated to extend radially inward on both sides of the space 6. It is formed by two fastening portions 8 and 9 that engage with the directional groove 3 and attachment means 10 for connecting the pair of joint segments 1 and 2 to each other.
[0003]
The housing-type pipe joint is formed by pressing the two pipes 4 and 5 with the elastic rings 7 disposed in the spaces 6 and 6 of the pair of arc-shaped joint segments 1 and 2, thereby pressing the two pipes 4 and 4. The two ends of the pipe 5 are sealed by pressing the fastening portions 8 and 9 provided on the joint segments 1 and 2 to the bottom of the circumferential groove 3 provided on the ends of the two pipes 4 and 5. 4 and 5 are fixed to the arc-shaped joint segments 1 and 2.
[0004]
[Problems to be solved by the invention]
The housing-type pipe joint must be dimensioned so that the fastening part provided in each joint segment is pressed against the bottom of the circumferential groove provided in the pipe. The nominal diameter is the same and there is a substantial difference in the diameter of the pipe, and there is also a difference in the depth of the circumferential groove of the pipe. The problem is that the tube is weakly fixed by the part and the ends of the two pipes cannot be securely fixed, and the two pipe ends are stretched, contracted, or bent at the joint. There is.
In addition, the housing-type pipe joint has a structure in which the joint portion of the pair of arc-shaped joint segments touches the metal, so that the pipe is being tightened due to the relationship between the outer diameter tolerance of the pipe and the manufacturing dimension tolerance of the arc-shaped joint segment. At this stage, the arc-shaped joint segments may be in metal touch with each other, and the ends of the two pipes may not be reliably fixed by the tightening portion.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a housing-type pipe joint that can securely fix the ends of two pipes even if there is a difference in the depth of the circumferential groove of the pipe. And
[0006]
[Means for Solving the Problems]
The housing-type pipe joint of the present invention is provided with a pair of arc-shaped joint segments, a space for accommodating the ends of the pair of pipes formed in each arc-shaped joint segment and an elastic ring, and both sides of the space. A pair of tightening portions that engage with the circumferential grooves of the respective pipes, an indicia coupling portion provided on both end faces of the arc-shaped joint segment, and an attachment means for coupling the pair of arc-shaped joint segments to each other; The stamping joint part has a convex engagement part and a concave engagement part having the same width, and the convex engagement part of one stamping joint part and the concave engagement part of the other stamping joint part face each other. One of the tightening portions extends continuously from the joint surface to an angular position of about 45 degrees adjacent to the convex engagement portion of the stamping joint portion provided on one end surface. Ridges that contact the side wall far from the pipe end of the circumferential groove of the circumferential groove and the stamp provided on the other end surface A protrusion that continuously extends from the joint surface to an angular position of about 45 degrees adjacent to the concave engaging portion of the joint portion and abuts against a side wall near the tube end of the circumferential groove of one tube, The other of the two portions is adjacent to the concave engaging portion of the stamping joint portion provided on one end surface and continuously extends from the joint surface to an angular position of about 45 degrees on the side wall near the tube end of the circumferential groove of the other tube. A side wall that extends continuously from the joint surface to an angular position of about 45 degrees adjacent to the projecting engagement portion provided on the other end surface and the projecting engagement portion provided on the other end surface and is far from the tube end of the circumferential groove of the other tube It has the protrusion which contact | abuts.
The housing-type pipe joint according to the present invention is provided with a pair of arc-shaped joint segments, a space for accommodating an end of the pair of pipes formed in each arc-shaped joint segment and an elastic ring, and both sides of the space. A pair of tightening portions that engage with the circumferential grooves of the respective pipes, an indicia coupling portion provided on both end faces of the arc-shaped joint segment, and an attachment means for coupling the pair of arc-shaped joint segments to each other; The stamping joint part has a convex engagement part and a concave engagement part having the same width, and the convex engagement part of one stamping joint part and the concave engagement part of the other stamping joint part face each other. One of the tightening portions is continuously extended from the joint surface to an angular position of about 45 degrees adjacent to the convex engagement portion of the stamping joint portion provided on one end surface. Tightening part that contacts the side wall far from the pipe end of the circumferential groove of one pipe and the other end face Tightening that continuously extends from the joint surface to an angular position of about 45 degrees adjacent to the concave engagement portion of the provided stamping joint portion and abuts the inner surface against the side wall near the tube end of the circumferential groove of one tube And the other of the tightening portions extends continuously from the joint surface to an angular position of about 45 degrees adjacent to the concave engagement portion of the stamping joint provided on one end surface, and the inner surface of the other fastening portion. Adjacent to the tightening portion that contacts the side wall near the tube end of the circumferential groove and the convex engagement portion of the stamping joint portion provided on the other end surface, and continuously extends from the joint surface to an angular position of about 45 degrees. It is characterized by having a tightening portion whose side face abuts against a side wall far from the pipe end of the circumferential groove of the other pipe.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 20 denotes one arcuate joint segment 20 of the arcuate joint segment forming a pair of housing-type pipe joints according to the present invention. Since the pair of arcuate joint segments 20 and 20a have the same configuration, only one arcuate joint segment 20 will be described.
[0008]
As shown in FIGS. 1 to 4, the arc-shaped joint segment 20 has a stamping joint portion 21 on both end faces. The stamp coupling portion 21 is composed of a convex engagement portion 22a having a width that is approximately half the width of the arc-shaped joint segment 20 and a concave engagement portion 22b having a width that is approximately half. The stamped joint coupling portions 21 and 21 provided on both end surfaces have a convex engagement portion 22a and a concave engagement portion 22b of one stamped joint coupling portion, and a concave engagement portion 22b and a convex engagement portion of the other stamped joint coupling portion. It arrange | positions so that 22a may be opposed.
As shown in FIGS. 3 and 4, the arc-shaped joint segment 20 and the arc-shaped joint segment 20 a are incline coupled by moving in a direction approaching each other, and are integrally formed by a normal mounting means 10 such as a bolt and nut. Combined.
[0009]
As shown in FIGS. 1 to 3, the arcuate joint segment 20 is a space for housing the ends of the pipes 4 and 5 provided with the circumferential grooves 3 and the elastic ring 7 surrounding the ends of the pipes 4 and 5. 23. On one side of the space 23, a tightening portion 24 extending inward in the radial direction from one side wall of the space 23 is formed. As shown in FIG. 3, the tightening portion 24 is fitted into a circumferential groove 3 provided at the end of one tube 4 to fix the end of the tube 4 to the arc-shaped joint segment 20. A fastening portion 25 extending inward in the radial direction from the other side wall of the space 23 is also formed on the other side of the space 23. As shown in FIG. 3, the tightening portion 25 is fitted into the circumferential groove 3 provided at the end portion of the other tube 5 to fix the end portion of the tube 5 to the arc-shaped joint segment 20.
[0010]
The tightening portion 24 has an end surface having the same radius of curvature from one end in the circumferential direction (upper side in FIG. 2) to the other end in the circumferential direction (lower side in FIG. 2). As shown in FIGS. 1 and 2, the tightening portion 24 protrudes inwardly toward one end in the circumferential direction and comes into contact with the side wall 3 a near the tube end of the circumferential groove 3 provided at the end of one tube 4. An arc-shaped ridge 26 and an arc-shaped ridge 27 that protrudes outwardly on the other end in the circumferential direction and contacts the side wall 3b far from the tube end of the circumferential groove 3 of one tube 4 are provided. The arc-shaped ridge 26 and the arc-shaped ridge 27 extend continuously from the joint surface 30 to a position of about 45 degrees. The contact surfaces of the arc-shaped protrusions 26 and the arc-shaped protrusions 27 on the side wall of the pipe are parallel to the plane orthogonal to the axis of the pipe.
[0011]
Similar to the tightening portion 24, the tightening portion 25 has an end surface with the same radius of curvature from one end in the circumferential direction (upper side in FIG. 2) to the other end in the circumferential direction (lower side in FIG. 2). As shown in FIGS. 1 and 2, the tightening portion 25 protrudes outward at one end in the circumferential direction and contacts the side wall 3 b far from the tube end of the circumferential groove 3 provided at the end of the other tube 5. And an arcuate ridge 29 that protrudes inwardly on the other end side in the circumferential direction and abuts on the side wall 3a near the tube end of the circumferential groove 3 provided at the end of the other tube 5. . The arc-shaped ridges 28 and the arc-shaped ridges 29 extend from the joint surface 30 to about 45 degrees in the same manner as the arc-shaped ridges 26 and the arc-shaped ridges 27. It is a plane parallel to the plane orthogonal to
[0012]
As shown in FIG. 1 and FIG. 2, an arcuate ridge 27 projecting outwardly provided on the fastening part 24 and an arcuate ridge 28 projecting outwardly provided on the fastening part 25 are respectively An arc-shaped protrusion 26 that protrudes inwardly provided on the tightening part 24 and an arc-shaped protrusion that protrudes inwardly provided on the tightening part 25, located on the convex engagement part 22 a side of the stamping joint part 21. The strip portion 29 is located on the concave engagement portion 22b side of each stamping joint portion 21.
[0013]
As shown in FIG. 5 (a), the arc-shaped joint segment 20 and the arc-shaped joint segment 20a are formed so that the concave engagement portion 22b and the convex engagement portion 22a of the one stamp coupling portion 21 arranged to face each other are the other. The seal 21 is coupled by fitting into the concave engagement portion 22b and the convex engagement portion 22a of the coupling portion 21.
[0014]
Next, the assembly procedure of the housing type pipe joint will be described.
As a preparatory stage for fixing the ends of the pair of tubes 4 and 5 to the housing-type pipe joint, the tubes 4 and 5 are mounted so that the ends of the elastic ring 7 face each other to form a fluid tight seal assembly. To do.
[0015]
Next, the assembly is disposed on the arc-shaped joint segment 20 so that the elastic ring 7 enters the space 23. In FIG. 5A, the elastic ring is omitted for the sake of clarity.
[0016]
Next, as shown in FIG. 5 (a), the other arcuate joint segment 20a has a concave engagement part 22b and a convex engagement part 22a. The convex engagement part 22a of the arcuate joint segment 20 is concavely engaged. The arcuate joint segment 20 is disposed so as to correspond to the portion 22b, and the arcuate joint segment 20a and the arcuate joint segment 20a are pressed in a direction approaching each other to fit the convex engagement portion 22a into the concave engagement portion 22b. Match.
[0017]
In the stage before the fitting of the arc-shaped joint segment 20 and the arc-shaped joint segment 20a, as shown in FIG. 5A, the tightening portion 24 of the arc-shaped joint segment 20 is connected to the tube 4 on the arc-shaped protrusion 26 side. Of the circumferential groove 3 and floats from the bottom surface of the circumferential groove 3 of the pipe 4 on the side of the arcuate ridge 27, and the tightening portion 25 of the arcuate joint segment 20 is connected to the pipe on the side of the arcuate ridge 29. 5 is in contact with the bottom surface of the circumferential groove 3, floats from the bottom surface of the circumferential groove 3 of the tube 5 on the side of the arc-shaped protrusion 28, and the circular arcs 26 and 27 of the tightening portion 24 and the circle of the tightening portion 25. The arcuate ridges 28 and 29 are in idle positions spaced from the side wall 3a of the circumferential groove 3 of the tubes 4 and 5, respectively.
Although the arc-shaped joint segment 20a is not shown in FIG. 5B, the tightening portions 24a and 25a of the arc-shaped joint segment 20a are opposite to the tightening portions 24 and 25 of the arc-shaped joint segment 20. Positioned to do.
[0018]
Next, the arc-shaped joint segment 20 and the arc-shaped joint segment 20a are integrally coupled by a normal mounting means 10 such as a bolt and nut shown in FIG. When the arc-shaped joint segment 20 and the arc-shaped joint segment 20a are joined, as shown in FIG. 6 (a), a stamping joint 21 provided in the arc-shaped joint segment 20 and a stamping joint provided in the arc-shaped joint segment 20a. The portion 21 is fitted, and the arc-shaped joint segment 20 and the arc-shaped joint segment 20a are stamped.
[0019]
At the stage where the arc-shaped joint segment 20 and the arc-shaped joint segment 20a are fitted, the arc-shaped joint segment 20 swings in the direction indicated by the arrow in FIG. 6B, and the arc-shaped joint segment 20a (not shown) Swings in the opposite direction.
[0020]
When the arcuate joint segment 20 and the arcuate joint segment 20a are joined, the arcuate protrusion 26 of the tightening portion 24 in the arcuate joint segment 20 is connected to the circumference of the tube 4 as shown in FIG. The tube 4 is pressed against the side wall 3a near the tube end of the directional groove 3 to press the tube 4 in the tube end direction indicated by the arrow, and the arcuate protrusion 27 of the tightening portion 24 is far from the tube end of the circumferential groove 3 of the tube 4. The tube 4 is pressed against the side wall 3b in the direction opposite to the tube end indicated by the arrow. At the same time, the arc-shaped protrusion 28 of the tightening portion 25 abuts against the side wall 3b far from the tube end of the circumferential groove 3 of the tube 5 and presses the tube 5 in the direction opposite to the tube end indicated by the arrow. The arc-shaped protrusion 29 abuts against the side wall 3a near the tube end of the circumferential groove 3 of the tube 5 and presses the tube 5 in the tube end direction indicated by the arrow.
[0021]
The arc-shaped joint segment 20a moves in the opposite direction to the arc-shaped joint segment 20, and in the arc-shaped joint segment 20a, the arc-shaped joint segments 20a are provided on the arc-shaped protrusions 26a and 27a and the fastening part 25a. The arc-shaped ridges 28a and 29a act in a similar manner symmetrically to the arc-shaped ridges 26 and 27 provided on the tightening portion 24 of the arc-shaped joint segment 20 and the arc-shaped ridges 28 and 29 provided on the tightening portion 25. To do.
[0022]
An arc-shaped ridge 26 and an arc-shaped ridge 27 provided on the tightening portion 24 of the arc-shaped joint segment 20 and an arc-shaped ridge 26a and an arc-shaped ridge 27a provided on the tightening portion 24a of the arc-shaped joint segment 20a are: , Each extending continuously from the joint surface 30 to an angular position of about 45 degrees.
[0023]
Here, as shown in FIG. 7, when the cross section of the tube is considered to be a ring, the ring 30 is supported at four points a, b, c, and d spaced 45 degrees in the circumferential direction. Thus, a and c hold the ring 30 from above, and b and d hold the ring 30 from below. Therefore, the ring 30 is equally supported at an angular position of 45 degrees with respect to the XX line passing through the center o and the YY line perpendicular to the XX line, and in which direction the tube bends. However, the four points a, b, c, and d are equally received, and the tube is securely fixed.
[0024]
In this way, the housing-type pipe joint presses the bottom and side walls of the circumferential grooves 3 and 3 provided at the ends of the pair of pipes 4 and 5 by the tightening portion, so that the ends of the pair of tubes 4 and 5 Are securely fixed, and the ends of the pair of tubes 4 and 5 do not extend, contract or bend with respect to the axial direction in the joint portion, and the elastic ring 7 accommodated in the space 23 can be twisted. Can be prevented.
[0025]
In the above embodiment, the housing type pipe joint is configured such that the bottom surface and the side wall of the circumferential groove provided at the end of the tube are pressed by the tightening portion. You may make it press a side wall. By pressing the outer peripheral surface and the side wall of the pipe with the tightening portion, the distance between the pipe and the bottom surface of the space 23 can be set constant regardless of the depth of the circumferential groove provided at the end of the pipe. The amount of tightening of the elastic ring 7 disposed on can be made constant.
[0026]
8 and 9 show an arcuate joint segment 120 of a second embodiment of a housing-type pipe joint according to the present invention. Since the arc-shaped joint segment 120 and the arc-shaped joint segment 120a have the same configuration, only one arc-shaped joint segment 120 will be described.
[0027]
The arc-shaped joint segment 120 differs from the arc-shaped joint segment 20 shown in FIG. 1 in the configuration of the tightening portion, and the other parts have the same configuration.
[0028]
As shown in FIGS. 8 to 10, the arc-shaped joint segment 120 includes a tightening portion 124 A extending in an arc shape radially inward from one joint surface 130 A to a position of about 45 degrees on one side of the space 123. A fastening portion 124B extending in an arc shape radially inward from the other joint surface 130B to a position of about 45 degrees on the one side of the space 123, and about 45 degrees from the one joint surface 130A on the other side of the space 123. A tightening portion 125A extending in an arc shape radially inward to a position, and a tightening portion 125B extending in an arc shape radially inward from the other joint surface 130B to a position of about 45 degrees on the other side of the space 123. .
[0029]
The tightening portion 124 A has an engagement surface 126 that protrudes inwardly on the inner surface facing the space 123 and presses against the side wall 3 a near the tube end of the circumferential groove 3 of one tube 5. The tightening portion 124 B has an engagement surface 127 that protrudes outward on the outer surface opposite to the space 123 and presses against the side wall 3 b far from the tube end of the circumferential groove 3 of one tube 5. The tightening portion 125 A has an engagement surface 128 that protrudes outward on the outer surface opposite to the space 123 and presses against the side wall 3 b far from the tube end of the circumferential groove 3 of the other tube 4. The tightening portion 125 B has an engagement surface 129 that protrudes inwardly on the inner surface facing the space 123 and presses against the side wall 3 a close to the tube end of the circumferential groove 3 of the other tube 4.
[0030]
As shown in FIG. 8, each of the stamped joints 121 has a convex surface 140 having a rounded inner corner on the fitting end side of the convex engagement portion 122a. Thereby, the arc-shaped joint segment 120 and the arc-shaped joint segment 120a are smoothly stamped and joined without the convex engagement portions 122a hitting each other strongly.
[0031]
As shown in FIG. 11, the width W of the arc-shaped joint segment 120 is far from the pipe ends of the circumferential grooves 3 and 3 of the two pipes 4 and 5 when the two pipes 4 and 5 abut on the end faces. It is set narrower than the distance L between the side walls 3b, 3b. When the two pipes 4 and 5 are piped in the vertical direction, the arc-shaped joint segments 120 and 120a are easily fitted into the two pipes 4 and 5 without pushing up the pipe 5 located on the upper side.
[0032]
Next, the procedure for assembling the housing-type pipe joints into the two pipes 4 and 5 arranged in the vertical direction will be described.
First, one tube 4 is arranged in the vertical direction, and an elastic ring (FIG. 6) is attached to the tube end of this tube 4. Next, the other tube 5 is arranged on the upper side of the tube 4, the tube 5 is moved in the direction of the tube 4, and the tube end of the tube 5 is fitted into an elastic ring attached to the tube 4. For convenience of explanation, the elastic ring is omitted in FIG.
[0033]
Since the two pipes 4 and 5 are arranged in a state where the pipe ends are in contact with each other, a gap L is formed between the side walls 3b and 3b far from the pipe ends of the circumferential grooves 3 and 3 of the two pipes 4 and 5. Is done. The interval L is set wider than the width W of the arc-shaped joint segment 120.
[0034]
Next, as shown in FIG. 12, the arc-shaped joint segments 120 and 120a are arranged to face each other so as to sandwich the ends of the two tubes 4 and 5. The arcuate joint segment 120 and the arcuate joint segment 120a have the same shape, and the concave engagement part 122b and the convex engagement part 122a of one stamping joint part 121 are the convex engagement part of the other stamping joint part 121. It fits in 122a and the concave engaging part 122b. The arc-shaped joint segment 120 and the arc-shaped joint segment 120a are integrally coupled by a normal bolt / nut mounting means 10 (FIG. 6).
[0035]
The arc-shaped joint segment 120 and the arc-shaped joint segment 120a are in a state where the convex engagement portions 122a of the stamping joint portion 21 are in light contact with each other in the middle of the fitting shown in FIG. The circumferential grooves 3 and 3 are disposed in an inclined manner at an interval L.
Next, when the arc-shaped joint segment 120 and the arc-shaped joint segment 120a are tightened by the attaching means 10 in the direction indicated by the arrow in FIG. 12, the arc-shaped joint segment 120 and the arc-shaped joint segment 120a are formed by the two tubes 4, 5 The convex engagement part 122a and the concave engagement part 122b of the arc-shaped joint segment 120 are fitted to the concave engagement part 122b and the convex engagement part 122a of the arc-shaped joint segment 120a.
[0036]
As shown in FIG. 12, the arc-shaped joint segment 120 is rotated in the direction of arrow A by screw tightening of the bolt-nut mounting means 10, and the arc-shaped joint segment 120a is turned into the bolt-nut mounting means 10 as shown in FIG. It is rotated in the direction of arrow B by screw tightening. In this case, the outwardly protruding engagement surface 127 provided on the tightening portion 124B and the outwardly protruding engagement surface 128 provided on the tightening portion 125A are formed on the convex engagement portion 122a of the stamping joint portion 121. Since it is located on the near side, it rotates in the same direction as the screw tightening direction of the bolt and nut mounting means 10.
[0037]
At the stage where the arc joint coupling between the arc joint segment 120 and the arc joint segment 120a is completed, as shown in FIG. 13, the convex engagement portion 122 of the stamp joint coupling portion 121 provided on the arc joint segment 120 and the arc joint The convex engagement portions 122a of the stamping joint portion 121 provided on the segment 120a are pressed against each other on the side surfaces, and the force in the direction indicated by the arrow on the engagement surface 127 of the tightening portion 124B and the engagement surface 128 of the tightening portion 125A. As a result, the upper pipe 5 moves away from the lower pipe 4, and the distance between the side walls 3a, 3a of the circumferential grooves 3, 3 of the two pipes 4, 5 increases from L to L '. To spread. Therefore, the engaging surface 127 of the tightening portion 124B and the engaging surface 128 of the tightening portion 125A press-contact the side walls 3a and 3a of the circumferential grooves 3 and 3 of the tubes 4 and 5, so that an external force that moves the tube acts. Even in this case, the arc-shaped joint segment 120 and the arc-shaped joint segment 120a are not laterally displaced, and the fixing force to the tubes 4 and 5 is strengthened.
[0038]
【The invention's effect】
As described above, according to the present invention, the pipe and the pipe can be securely fixed by pressing the protrusion or the engaging surface provided on the side surface of the tightening portion against the side wall of the circumferential groove of the pipe. Moreover, even if there is a manufacturing error in the arc-shaped joint segment, the relative movement and rotation of the pipe can be prevented without being affected by the manufacturing error.
[Brief description of the drawings]
FIG. 1 is a perspective view of an arcuate joint segment of a housing-type pipe joint according to the present invention.
2 is a development view in which a part of the arc-shaped joint segment shown in FIG. 1 is cut away. FIG.
FIG. 3 is a front view of a housing-type pipe joint showing a state in which a pair of arc-shaped joint segments are joined by stamping.
4 is a side view of the housing-type pipe joint of FIG. 3;
FIG. 5 is a view showing a stage before tightening of the housing type pipe joint according to the present invention;
FIG. 6 is a view showing a stage after tightening of the housing type pipe joint according to the present invention.
FIG. 7 is a diagram showing an action point for a pipe of a housing-type pipe joint according to the present invention.
FIG. 8 is a perspective view of an arcuate joint segment of a second embodiment of a housing-type pipe joint according to the present invention as seen from one side.
FIG. 9 is a perspective view of the arcuate joint segment of the second embodiment of the housing-type pipe joint according to the present invention as seen from the other side.
FIG. 10 is a development view in which a part of an arc joint segment of a second embodiment of a housing type pipe joint according to the present invention is cut away.
FIG. 11 is a view showing a relationship between a housing-type pipe joint and a circumferential groove provided in a pair of pipes.
FIG. 12 is a diagram showing a stage before tightening of the housing-type pipe joint according to the second embodiment of the present invention.
FIG. 13 is a view showing a stage after tightening of the housing-type pipe joint according to the second embodiment of the present invention.
FIG. 14 is an exploded perspective view of a conventional housing type pipe joint.
[Explanation of symbols]
3 Circumferential groove 3a, 3b Side wall 4 Tube 5 Tube 20 Arc joint segment 21 Stamping joint portion 22a Convex engagement portion 22b Concave engagement portion 24 Clamping portion 25 Clamping portion 26 Projection 27 Projection 27 Projection 29 Projection 29 Projection 124A, 124B Clamping part 125A, 125B Clamping part 126 Engagement surface 127 Engagement surface 128 Engagement surface 129 Engagement surface

Claims

A pair of arcuate joint segments, a space for accommodating the ends and elastic rings of the pair of tubes formed in each arcuate joint segment, and a circumferential groove of each tube provided on both sides of this space A pair of tightening portions to be joined together, an indicia coupling portion provided on both end faces of the arc-shaped joint segment, and an attachment means for coupling the pair of arc-shaped joint segments to each other, A convex engaging portion and a concave engaging portion having the same width are arranged so that the convex engaging portion of one stamping joint portion and the concave engaging portion of the other stamping joint portion are opposed to each other. One of the portions extends continuously from the joint surface to an angular position of about 45 degrees adjacent to the convex engagement portion of the stamping joint provided on one end surface, and is far from the tube end of the circumferential groove of one tube Adjacent to the protrusion that contacts the side wall and the concave engaging portion of the stamped joint connecting portion provided on the other end surface. A protrusion extending continuously from the surface to an angular position of about 45 degrees and abutting against a side wall near the tube end of the circumferential groove of one tube, and the other of the tightening portions is connected to the stamp A protrusion that continuously extends from the joint surface to an angular position of about 45 degrees adjacent to the concave engagement portion of the first portion and abuts on the side wall near the tube end of the circumferential groove of the other tube, and a stamped joint provided on the other end surface It is characterized by having a ridge that continuously extends from the joint surface to an angular position of about 45 degrees adjacent to the convex engaging portion of the portion and abuts against a side wall far from the tube end of the circumferential groove of the other tube. Housing type pipe joint.

2. The housing-type pipe joint according to claim 1, wherein the protrusion provided on the tightening portion makes surface contact with a side wall of a circumferential groove formed in the pipe.

A pair of arcuate joint segments, a space for accommodating the ends and elastic rings of the pair of tubes formed in each arcuate joint segment, and a circumferential groove of each tube provided on both sides of the space. A pair of tightening portions to be joined together, an indicia coupling portion provided on both end faces of the arc-shaped joint segment, and an attachment means for coupling the pair of arc-shaped joint segments to each other, A convex engaging portion and a concave engaging portion having the same width are arranged so that the convex engaging portion of one stamping joint portion and the concave engaging portion of the other stamping joint portion are opposed to each other. One of the parts extends continuously from the joint surface to an angular position of about 45 degrees adjacent to the convex engagement part of the stamping joint provided on one end surface, and the outer surface of the pipe in the circumferential groove of one pipe Concave portion of the fastening part that contacts the side wall far from the end and the stamping joint part provided on the other end surface A tightening portion that extends continuously from the joint surface to an angular position of about 45 degrees adjacent to the portion and abuts the inner surface against the side wall near the tube end of the circumferential groove of one tube, The other side wall is adjacent to the concave engagement portion of the seal coupling portion provided on one end surface and continuously extends from the joint surface to an angular position of about 45 degrees, and the inner surface is a side wall close to the tube end of the circumferential groove of the other tube. Adjacent to the projecting engagement portion provided on the other end surface and the fastening engagement portion provided on the other end surface and continuously extending from the joint surface to an angular position of about 45 degrees, the outer surface of the circumferential groove of the other pipe A housing-type pipe joint having a tightening portion that contacts a side wall far from the pipe end.

2. The housing-type pipe joint according to claim 1, wherein the arc-shaped joint segment has a width narrower than a length connecting side walls far from the pipe ends of the circumferential grooves of the two pipes in contact with each other.

5. The housing-type pipe joint according to claim 3, wherein the convex engagement portion of the stamping joint portion has a round convex surface at the inner corner of the fitting end.