JP3825892B2

JP3825892B2 - Pipe fitting

Info

Publication number: JP3825892B2
Application number: JP23773797A
Authority: JP
Inventors: 尚嗣大塚
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 1997-08-19
Filing date: 1997-08-19
Publication date: 2006-09-27
Anticipated expiration: 2017-08-19
Also published as: JPH1163324A

Description

【０００１】
【発明の属する技術分野】
本発明は、押輪の自動調心機能を備えた管継手に関する。
【０００２】
【従来の技術】
例えば、水道管等を配管する際において、管同士の接続には一方の管の受口部内に他方の管の挿口部に外嵌した押輪により、締付けるようにした管継手が用いられる。
【０００３】
このような押輪を有する管継手においては、押輪を受口部に締着する際、それらの中心を互いに同心状に整合させる必要がある。
【０００４】
すなわち、押輪は径方向に若干の遊び間隙を設けて挿口部に外嵌されるため、管の接続時は押輪の自重により管頂に懸垂状態となっており、受口部の中心に対して心ずれを起こしている。
【０００５】
この状態のまま、押輪を受口部に締着すると、管頂付近の取付ねじと管底付近の取付ねじの締付力が不均一となって、パッキンを均等に押圧できず、地震等により管が伸縮するなどした際に、漏水事故を引き起こしたり、管底側よりパッキンが飛び出す恐れがある。
【０００６】
この問題を解決するものとして、図９に示すような管継手が知られている。
【０００７】
この従来の管継手は、右方の管体１の受口部１ａと、この受口部１ａ内に遊挿された左方の管体２における挿口部２ａとの間の隙間３内に、パッキン４を挾入し、このパッキン４の側面の内周縁に、外周面が外方に向って漸次テーパ状に縮径する環状舌片４ａを連設してある。
【０００８】
管体２に外嵌された押輪５のフランジ５ｂを、Ｔ頭ボルト６とナット７により、受口部１ａのフランジ１ｂに締め付けると、押輪５の環状押圧部５ａの右端内周縁が、舌片４ａの外周面上に乗り上げて上方に押上げられることにより、受口部１ａと押輪５とが自動的に同心上に整合する。
【０００９】
【発明が解決しようとする課題】
上述した従来の管継手では、舌片４ａがゴム等の比較的軟質なパッキン４に一体形成されているため、特に押輪５が大型で大重量であると、管頂付近の舌片４ａの外周面上に環状押圧部５ａが乗り上げる際に、舌片４ａが半径方向に強く押圧され、摺動抵抗が増大するようになる。
【００１０】
このようになると、パッキン４が局部的に挿口部２ａの外周面に強く圧接して均一に押圧されず、各ボルト、ナット６、７を均等に締め付けたとしても、上下のパッキン４の押圧力に差が生じ、シール性が損われることがある。
【００１１】
また、舌片４ａがパッキン４に一体形成されていると、通常市販されているパッキンを使用することはできず、それ専用の成形金型等を新たに製作する必要があるため、コスト高となる。
【００１２】
本発明は、上記問題点を解決するためになされたもので、パッキンと分離した調心部材を用いることにより、パッキンの摺動抵抗を軽減してこれを均一に押圧しうるようにし、かつ通常のパッキンを使用しうるようにした安価な管継手を提供することを目的としている。
【００１３】
【課題を解決するための手段】
上記目的を達成するために、本発明の管継手は、一方の管体の受口部内に、他方の管体の挿口部を遊挿し、受口部の内周面と挿口部の外周面との間の隙間に挾入したパッキンを、挿口部に外嵌した押輪を受口部に締着し、該押輪の環状押圧部により強圧し、前記両管体同士を接続するようにした管継手において、パッキンと押輪との間における挿口部の外周面の少くとも管頂部領域に、外周面が押輪側に向って漸次縮径するテーパ面と、該テーパ面からパッキン側が前記他方の管体外周面に対して平行な水平部上面をなし、該水平部の厚みが前記押輪の環状押圧部と前記他方の管体の挿口部との間に形成される最大隙間のほぼ１／２に形成されているとともに、前記水平部のパッキング側端面に外方へ延びる乗り上げ防止片を設けた、硬質でかつ摩擦係数の小さな合成樹脂材からなる調心部材を設け、前記押輪の押圧部の内周縁が前記調心部材のテーパ面上に乗り上がり、前記水平部上面まで移動することにより、押輪を受口部と同心上に整合させることを特徴としている。
【００１９】
本発明によると、押輪を受口部に徐々に前進させるに従って、押輪の押圧部が調心部材の外周面のテーパ面に乗り上がり、押輪全体を求心方向に押し上げることにより、押輪と受口部とは容易に同心上に整合する。この調心時において、調心部材はパッキンと別体をなしているため、パッキンが半径方向に強く押圧されることはなく、摺動抵抗が軽減されて管軸方向に均一に押圧される。
【００２０】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明する。なお、図９に示す従来例と同様の部材には、同じ符号を付してその詳細な説明を省略する。
【００２１】
図１において、従来例と同様、受口部１ａと挿口部２ａとの間の隙間３には、パッキン４が挾入され、このパッキン４と押輪５との間における挿口部２ａの外周面には、リング状の調心部材８が外嵌されている。
【００２２】
調心部材８の押輪５側の外周面は、図１に示すように押輪５側に向って漸次縮径するなだらかなテーパ面８ａと、このテーパ面８ａからパッキン 4 側が他方の管体２の外周面に対して平行な水平部上面８ｂと、をなしている。なお、調心部材８の水平部の厚みは押輪５の環状押圧部５ａと管体 2 の挿口部２ａとの間に形成される最大隙間のほぼ１／２としてある。
【００２３】
調心部材８は、比較的硬質でかつ摩擦係数の小さい材料、例えば超高分子量ポリエチレン、フッ素樹脂、ポリアセタール、ポリカーボネート等の合成樹脂材により形成されている。
【００２４】
管体１、２を接続するには、まず挿口部２ａの開口端より、押輪５、調心部材８、パッキン４を、順に外嵌したのち、挿口部２ａを受口部１ａ内に挿入する。
【００２５】
ついで、隙間３内に、パッキン４を、手で押し込める程度まで挾入したのち、図１に示すように、受口部１ａと押輪５のそれぞれのフランジ１ｂ、５ｂ同士を、Ｔ頭ボルト６とナット７により仮止めする。この状態で押輪５は、自重により、挿口部２ａの管頂に懸垂された状態となり、管底側に隙間が形成されている。
【００２６】
ついで、各ナット７を徐々に均等に締め付けると、調心部材８は押輪５により軸方向に押動されてパッキン４に当接する。なおもナット７を締め込んでいくと、押輪５における管頂付近の環状押圧部５ａの内周縁が、調心部材８のテーパ面８ａ上を摺動して乗り上がり、押輪５全体は求心方向に向って上方に押し上げられる。
【００２７】
そして、環状押圧部５ａが調心部材８の水平部上面8ｂまで移動すると、図２に示すように、受口部２ａと押輪５とは、ほぼ同心上に整合し、挿口部２ａの外周面と環状押圧部５ａの内周面との間には、ほぼ均一な隙間が形成される。
【００２８】
この状態でさらにナット７を締め込むと、パッキン４は環状押圧部５ａにより強く押圧されて隙間３内に押し込まれ、両管体１、２の接合部の水密性が確保される。
【００２９】
上記押輪５の調心時において、環状押圧部５ａは、摩擦係数の小さな調心部材８のテーパ面８ａ上に容易かつスムーズに乗り上げることができる。従って、調心部材８に無理な荷重が作用したり、調心部材８がパッキン４を強く押圧したりする恐れはなく、パッキン４は、押輪５の押圧力によって管軸方向へのみ押圧されるようになる。
【００３０】
その結果、調心用の舌片がパッキン４に一体形成されている従来の管継手のように、パッキン４が半径方向に強く押圧されることはなく、摺動抵抗が軽減されることにより、各ナット７を均一に締め付ければ、パッキン４の押圧力も均一となり、シール性を向上させることができる。
【００３１】
図３及び図４は、調心部材の変形例を示す。
【００３２】
図３に示す調心部材９は、半円形の２分割構造として挿口部２ａの外周面に外嵌しうるようにしてある。この例の場合、互いの突合わせ端面を管頂付近に位置させないように外嵌するのがよい。
【００３３】
図４に示す調心部材１０は、円周方向のほぼ１／４が切除された欠円状をなし、想像線のように拡径方向に弾性変形させて挿口部２ａに外嵌しうるようにしてある。
【００３４】
このように、２分割又は欠円状の調心部材９、１０とすれば、上述したリング状の調心部材８は、管体１、２同士を新たに接続する際にのみ使用しうるのに対し、受口部１ａ内に挿口部２ａが挿入されている既設の管継手に使用することができる。
【００３５】
図５及び図６は、上記２分割又は欠円構造とした調心部材８、９の変形例を示す。
【００３６】
図５に示すものは、調心部材８、９の右端面に針状突起１１を複数連設し、この針状突起１１をパッキン４の左端面に刺突させて、挿口部２ａに外嵌するようにしたものである。
【００３７】
図６に示すものは、管体２がダクタイル鋳鉄等の鉄管製の際に用いられるもので、調心部材９内に永久磁石１２を埋設してある。
【００３８】
これらのようにすると、調心部材８、９が、針状突起１１又は磁石１２の吸着力により挿口部２ａの外周面に保持され、落下や円周方向に回動するのが防止されるので、作業性が向上する。
【００３９】
図７に示すものは、調心部材８、９の水平部の右端に、この調心部材８、９の水平部外径よりも大きく外に張り出す乗り上げ防止片１３が形成されたものであり、比較的薄肉の部材で構成されている。
【００４０】
このような調心部材８を利用して図８のようにナット７を徐々に締め付けると、環状押圧部５ａが調心部材８のテーパ面８ａ上に乗り上がるわけであるが、何らかの理由で調心部材８が前方へ摺動しにくい場合等、押輪５が調心部材８を追い越すことになり調心部材８の役目を果さなくなる。しかし、本実施例によれば、この調心部材８の乗り上げ防止片１３が、押輪５の環状押圧部５ａに当接するため押輪５とともに調心部材８が前進することになる。
【００４１】
本発明は、上記実施例に限定されるものではなく、例えば調心部材８、９、１０の材質としては、上記合成樹脂の外、腐食しにくいステンレスやその他の金属（欠円状とした際は弾性変形可能な金属）又は硬質ゴム等により形成してもよい。
【００４２】
また、管体２が大径である場合には、２個以上に分割することもある。
【００４３】
さらに、各調心部材による調心作用は、懸垂状態にある押輪５を押し上げることにより行われるため、円弧状に形成した調心部材を、挿口部２ａの少くとも管頂部領域にのみ設けられるようにしてもよい。
【００４４】
本発明は、離脱防止機構を有する種々の管継手にも適用しうるのは勿論である。
【００４５】
【発明の効果】
本発明によれば、次のような効果が得られる。
【００４６】
調心部材を、パッキンとは別体に設けたことにより、従来のように、調心時にパッキンを半径方向に強圧することがなく、従って、摺動抵抗が軽減されてパッキンの押圧力はほぼ均一となり、シール性を大幅に向上させることができる。また、市販の通常のパッキンを使用しうるので、コスト低減が可能となる。
【００４７】
また、調心部材を硬質でかつ摩擦係数の小さな合成樹脂材からなるので、調心部材が挿口部の外周面上を円滑に摺動しうるとともに、押輪の押圧部がテーパ面上に容易かつスムーズに乗り上がる
【００５０】
更に、調心部材の水平部のパッキング側端面に外方へ延びる乗り上げ防止片が設けられているので、押輪が調心部材とともに確実に前進するため、調心部材の機能を確保できることになる。
【００５１】
【図面の簡単な説明】
【図１】本発明の一実施例における押輪締付け前の状態を示す中央縦断側面図である。
【図２】同じく、押輪締付け終了後の状態を示す中央縦断側面図である。
【図３】同じく、２分割構造とした調心部材の正面図である。
【図４】同じく、欠円状とした調心部材の正面図である。
【図５】同じく、針状突起を有する調心部材の要部の拡大縦断面図である。
【図６】同じく、永久磁石を埋設した調心部材の拡大縦断面図である。
【図７】同じく、乗り上げ防止片を有する調心部材の拡大縦断面図である。
【図８】図７の調心部材を用いた押輪締め付け時の状態を示す拡大断面図である。
【図９】従来の管継手を示す中央縦断側面図である。
【符号の説明】
１、２管体
１ａ受口部
１ｂフランジ
２ａ挿口部
３隙間
４パッキン
５押輪
５ａ環状押圧部
６Ｔ頭ボルト
７ナット
８、９、１０調心部材
８ａテーパ面
１１針状突起
１２永久磁石
１３乗り上げ防止片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint having a self-aligning function of a push ring.
[0002]
[Prior art]
For example, when a water pipe or the like is piped, a pipe joint that is tightened by a push ring externally fitted to the insertion part of the other pipe in the receiving part of one pipe is used to connect the pipes.
[0003]
In a pipe joint having such a push ring, when the push ring is fastened to the receiving portion, it is necessary to align their centers concentrically with each other.
[0004]
In other words, the pusher wheel is fitted around the insertion port with a slight play gap in the radial direction, so that when the tube is connected, it is suspended from the top of the tube by the weight of the pusher wheel. Is causing misalignment.
[0005]
If the press ring is fastened to the receiving part in this state, the tightening force of the mounting screw near the top of the tube and the mounting screw near the bottom of the tube will be uneven, and the packing cannot be pressed evenly. When the pipe expands or contracts, it may cause a water leakage accident or the packing may pop out from the bottom of the pipe.
[0006]
To solve this problem, a pipe joint as shown in FIG. 9 is known.
[0007]
This conventional pipe joint has a gap 3 between a receiving portion 1a of the right tube 1 and an insertion portion 2a in the left tube 2 that is loosely inserted into the receiving portion 1a. The packing 4 is inserted, and an annular tongue piece 4a whose outer peripheral surface gradually decreases in a taper shape toward the outer side is continuously provided on the inner peripheral edge of the side surface of the packing 4.
[0008]
When the flange 5b of the press ring 5 externally fitted to the tube body 2 is fastened to the flange 1b of the receiving portion 1a by a T-head bolt 6 and a nut 7, the inner peripheral edge of the right end of the annular press portion 5a of the press ring 5 is a tongue piece. By climbing on the outer peripheral surface of 4a and being pushed upward, the receiving portion 1a and the pusher wheel 5 are automatically aligned concentrically.
[0009]
[Problems to be solved by the invention]
In the above-described conventional pipe joint, the tongue piece 4a is integrally formed with a relatively soft packing 4 such as rubber, so that the outer periphery of the tongue piece 4a near the top of the pipe is particularly large when the pusher wheel 5 is large and heavy. When the annular pressing portion 5a rides on the surface, the tongue piece 4a is strongly pressed in the radial direction, and the sliding resistance increases.
[0010]
As a result, the packing 4 is locally pressed against the outer peripheral surface of the insertion portion 2a and is not pressed uniformly, and even if the bolts and nuts 6 and 7 are tightened evenly, Differences in pressure may occur and sealability may be impaired.
[0011]
In addition, if the tongue piece 4a is integrally formed with the packing 4, it is not possible to use a normally marketed packing, and it is necessary to newly manufacture a dedicated molding die or the like. Become.
[0012]
The present invention has been made to solve the above problems, and by using an aligning member separated from the packing, the sliding resistance of the packing can be reduced so that the packing can be pressed uniformly. An object of the present invention is to provide an inexpensive pipe joint that can use the above packing.
[0013]
[Means for Solving the Problems]
In order to achieve the above-described object, the pipe joint of the present invention is configured such that the insertion part of the other pipe body is loosely inserted into the receiving part of one pipe body, and the inner peripheral surface of the receiving part and the outer periphery of the insertion part. the packing was挾入the gap between the surfaces, as tightening and wear pressing ring which is fitted on the spigot portion to the socket portion, and strongly pressed by the annular pressing portion of the pressing ring, connecting the two pipe bodies In the pipe joint, at least the outer peripheral surface of the insertion portion between the packing and the press ring has a tapered surface in which the outer peripheral surface is gradually reduced in diameter toward the press wheel side , and the packing side extends from the tapered surface to the other side. A horizontal portion upper surface parallel to the outer peripheral surface of the tubular body is formed, and the thickness of the horizontal portion is substantially 1 of the maximum gap formed between the annular pressing portion of the push wheel and the insertion portion of the other tubular body. / 2 and is provided with an anti-climbing piece extending outwardly on the packing side end surface of the horizontal portion. One small synthetic made of a resin material aligning member of the friction coefficient is provided, the inner peripheral edge of the pressing portion of the junk ring rides on the on the tapered surface of said aligning member, the Rukoto be moved to the horizontal upper surface, a pressing ring It is characterized by being aligned concentrically with the receiving part.
[0019]
According to the present invention, as the pusher wheel is gradually advanced to the receiving part, the pushing part of the pusher wheel rides on the tapered surface of the outer peripheral surface of the aligning member and pushes up the entire pusher wheel in the centripetal direction. And easily align concentrically. At the time of this alignment, since the alignment member is separate from the packing, the packing is not strongly pressed in the radial direction, the sliding resistance is reduced, and the alignment member is pressed uniformly in the tube axis direction.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the member similar to the prior art example shown in FIG. 9 , and the detailed description is abbreviate | omitted.
[0021]
In FIG. 1, as in the conventional example, a packing 4 is inserted into the gap 3 between the receiving portion 1a and the insertion portion 2a, and the outer periphery of the insertion portion 2a between the packing 4 and the presser wheel 5 is inserted. A ring-shaped aligning member 8 is fitted on the surface.
[0022]
As shown in FIG. 1 , the outer peripheral surface of the aligning member 8 on the side of the pusher wheel 5 is a gently tapered surface 8 a that gradually decreases in diameter toward the pusher wheel 5 side, and the packing 4 side from the tapered surface 8 a is the side of the other tubular body 2. A horizontal upper surface 8b parallel to the outer peripheral surface . The thickness of the horizontal portion of the aligning member 8 is approximately as half of the maximum gap formed between the insertion opening portion 2a of the annular pressing portion 5a and the tubular body 2 of the junk ring 5.
[0023]
The aligning member 8 is formed of a material that is relatively hard and has a small friction coefficient, for example, a synthetic resin material such as ultrahigh molecular weight polyethylene, fluororesin, polyacetal, and polycarbonate.
[0024]
In order to connect the tubes 1 and 2, first, the pusher 5, the alignment member 8, and the packing 4 are sequentially fitted from the opening end of the insertion portion 2 a, and then the insertion portion 2 a is inserted into the receiving portion 1 a. insert.
[0025]
Next, after the packing 4 is inserted into the gap 3 to such an extent that it can be pushed by hand, the flanges 1b and 5b of the receiving portion 1a and the press ring 5 are connected to the T-head bolt 6 as shown in FIG. Temporarily fix with the nut 7. In this state, the pusher wheel 5 is suspended from the tube top of the insertion portion 2a by its own weight, and a gap is formed on the tube bottom side.
[0026]
Next, when the nuts 7 are tightened gradually and evenly, the aligning member 8 is pushed in the axial direction by the pusher wheel 5 and comes into contact with the packing 4. When the nut 7 is further tightened, the inner peripheral edge of the annular pressing portion 5a near the top of the pusher wheel 5 slides on the tapered surface 8a of the aligning member 8, and the pusher wheel 5 as a whole is in the centripetal direction. Is pushed upward toward
[0027]
Then, when the annular pressing portion 5a moves to the horizontal portion upper surface 8b of the aligning member 8, as shown in FIG. 2, the receiving portion 2a and the push wheel 5 are aligned substantially concentrically, and the outer periphery of the inserting portion 2a. A substantially uniform gap is formed between the surface and the inner peripheral surface of the annular pressing portion 5a.
[0028]
When the nut 7 is further tightened in this state, the packing 4 is strongly pressed by the annular pressing portion 5a and is pressed into the gap 3, so that the water tightness of the joint portion between the tubular bodies 1 and 2 is ensured.
[0029]
At the time of aligning the press wheel 5, the annular pressing portion 5a can easily and smoothly ride on the tapered surface 8a of the aligning member 8 having a small friction coefficient. Therefore, there is no fear that an excessive load acts on the aligning member 8 or the aligning member 8 strongly presses the packing 4, and the packing 4 is pressed only in the tube axis direction by the pressing force of the pusher wheel 5. It becomes like this.
[0030]
As a result, unlike the conventional pipe joint in which the alignment tongue piece is integrally formed with the packing 4, the packing 4 is not strongly pressed in the radial direction, and the sliding resistance is reduced. If each nut 7 is tightened uniformly, the pressing force of the packing 4 becomes uniform, and the sealing performance can be improved.
[0031]
3 and 4 show a modification of the alignment member.
[0032]
The alignment member 9 shown in FIG. 3 can be fitted on the outer peripheral surface of the insertion portion 2a as a semicircular two-part structure. In the case of this example, it is preferable to externally fit each other so that the butted end faces are not located near the top of the tube.
[0033]
The alignment member 10 shown in FIG. 4 has a cut-out shape in which approximately ¼ of the circumferential direction is cut off, and can be elastically deformed in the diameter-expanding direction like an imaginary line and can be externally fitted to the insertion portion 2a. It is like that.
[0034]
As described above, if the alignment members 9 and 10 are divided into two parts or are not circular, the ring-shaped alignment member 8 described above can be used only when the pipes 1 and 2 are newly connected to each other. On the other hand, it can be used for the existing pipe joint in which the insertion port 2a is inserted into the receiving port 1a.
[0035]
5 and 6 show a modification of the aligning members 8 and 9 having the above-described two-divided or oval structure.
[0036]
In the configuration shown in FIG. 5, a plurality of needle-like protrusions 11 are continuously provided on the right end surfaces of the aligning members 8 and 9, and these needle-like protrusions 11 are pierced on the left end face of the packing 4 so as to be attached to the insertion portion 2a. It is intended to fit.
[0037]
The one shown in FIG. 6 is used when the pipe body 2 is made of an iron pipe such as ductile cast iron, and a permanent magnet 12 is embedded in the aligning member 9.
[0038]
By doing so, the aligning members 8 and 9 are held on the outer peripheral surface of the insertion portion 2a by the attractive force of the needle-like protrusions 11 or the magnets 12, and are prevented from dropping or rotating in the circumferential direction. Therefore, workability is improved.
[0039]
Those shown in FIG. 7, the right end of the horizontal portion of the aligning members 8 and 9, which prevents pieces 13 ride protrudes outside greater than the horizontal portion outer diameter of the centering members 8 and 9 are formed It is composed of a relatively thin member.
[0040]
When the nut 7 is gradually tightened using the aligning member 8 as shown in FIG. 8, the annular pressing portion 5a rides on the tapered surface 8a of the aligning member 8. When the center member 8 is difficult to slide forward, the push ring 5 overtakes the centering member 8 and does not play the role of the centering member 8. However, according to the present embodiment, the climbing prevention piece 13 of the aligning member 8 comes into contact with the annular pressing portion 5 a of the press wheel 5, so that the aligning member 8 moves forward together with the press wheel 5.
[0041]
The present invention is not limited to the above embodiment. For example, the alignment members 8, 9, and 10 may be made of stainless steel or other metals that are not easily corroded, and are not easily corroded. May be formed of an elastically deformable metal) or hard rubber.
[0042]
Moreover, when the pipe body 2 has a large diameter, it may be divided into two or more.
[0043]
Further, since the aligning action by each aligning member is performed by pushing up the push wheel 5 in the suspended state, the aligning member formed in an arc shape is provided only at least in the tube top region of the insertion portion 2a. You may do it.
[0044]
Of course, the present invention can also be applied to various pipe joints having a detachment preventing mechanism.
[0045]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0046]
Since the aligning member is provided separately from the packing, the packing is not strongly pressed in the radial direction during alignment as in the prior art.Therefore, the sliding resistance is reduced and the packing pressing force is substantially reduced. It becomes uniform and sealability can be greatly improved. Moreover, since a commercially available normal packing can be used, the cost can be reduced.
[0047]
In addition, since the aligning member is made of a synthetic resin material that is hard and has a small friction coefficient, the aligning member can smoothly slide on the outer peripheral surface of the insertion portion, and the pressing portion of the press ring can be easily formed on the tapered surface. Get on smoothly and smoothly [0050]
In addition, since the anti-climbing piece extending outward is provided on the packing-side end surface of the horizontal portion of the aligning member , the pusher wheel reliably advances together with the aligning member, so that the function of the aligning member can be ensured.
[0051]
[Brief description of the drawings]
FIG. 1 is a central longitudinal side view showing a state before tightening a push ring in an embodiment of the present invention.
FIG. 2 is a central longitudinal sectional side view showing a state after the press ring tightening is completed.
FIG. 3 is a front view of the aligning member having a two-divided structure.
FIG. 4 is a front view of a centering member that is also in the shape of a circle.
FIG. 5 is an enlarged longitudinal sectional view of the main part of the aligning member having needle-like protrusions.
FIG. 6 is an enlarged longitudinal sectional view of a aligning member in which a permanent magnet is embedded.
FIG. 7 is an enlarged longitudinal sectional view of a aligning member having a riding-up preventing piece.
8 is an enlarged cross-sectional view showing a state when a push ring is tightened using the aligning member of FIG. 7. FIG.
FIG. 9 is a central longitudinal side view showing a conventional pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 Tube 1a Receiving part 1b Flange 2a Inserting part 3 Gap 4 Packing 5 Push ring 5a Annular press part 6 T head bolt 7 Nut 8, 9, 10 Alignment member 8a Tapered surface 11 Needle-like protrusion 12 Permanent magnet 13 Riding prevention piece

Claims

Insert the insertion part of the other tube loosely into the receiving part of one tubular body and insert the packing inserted into the gap between the inner peripheral surface of the receiving part and the outer peripheral surface of the insertion part. part tighten to wear fitted the junk ring on the socket portion, and strongly pressed by the annular pressing portion of the pressing ring in the pipe joint so as to connect the two pipe bodies,
A taper surface in which the outer peripheral surface gradually decreases in diameter toward the press ring side at the outer peripheral surface of the insertion portion between the packing and the press ring, and the other tube outer periphery from the taper surface to the packing side. A horizontal portion parallel to the surface is formed on the upper surface, and the thickness of the horizontal portion is formed to be approximately ½ of the maximum gap formed between the annular pressing portion of the press ring and the insertion portion of the other tubular body. And an alignment member made of a synthetic resin material that is hard and has a small friction coefficient, provided on the end surface on the packing side of the horizontal portion and extending outwardly, and an inner peripheral edge of the pressing portion of the press ring There the centering rides on the tapered surface of the member, the Rukoto be moved to the horizontal upper surface, a pipe joint, characterized in that aligning junk ring on the socket part and concentrically.