JP3834392B2

JP3834392B2 - Pipe fitting

Info

Publication number: JP3834392B2
Application number: JP24625697A
Authority: JP
Inventors: 強道高村
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 1997-08-27
Filing date: 1997-08-27
Publication date: 2006-10-18
Anticipated expiration: 2017-08-27
Also published as: JPH1163325A

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を挿入し、それらの間に挾入した環状のパッキンを、挿口部に外嵌した押輪により締め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、押輪を受口部に締結する際、それらの中心を互いに同軸上に整合させる必要がある。
【０００４】
すなわち、押輪は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、押輪を受口部に締結すると、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したりした際に、漏水事故を引き起こしたり、管底側よりパッキンが飛出す恐れがある。
【０００６】
この問題を解決するものとして、例えば実公平３−５１５８７号公報に開示されている管継手がある。
【０００７】
この従来の管継手は、図５に示すように、一方の管の受口部ａと他方の管の挿口部ｂとの間の隙間ｃに挾入されるパッキンｄの側面には、環状溝ｅが形成されており、また挿口部ｂに外嵌された押輪ｆの押圧面には、環状凸部ｇが形成されている。
【０００８】
図５（Ａ）に示すように、押輪ｆが挿口部ｂの管頂に懸垂された状態において、取付ボルト・ナットｈにより受口部ａと押輪ｆとを締め付けると、図５（Ｂ）に示すように、パッキンｄの環状溝ｅにより押輪ｆの環状凸部ｇが案内されて、上方に押上げられることにより、受口部ａと押輪ｆとは自動的に同軸上に整合するようになる。
【０００９】
【発明が解決しようとする課題】
しかしながら、上述した従来の管継手のように特に押輪ｆの押圧部に環状凸部ｇを形成する必要がある場合、加工に手間がかかるばかりか、環状凸部ｇが、例えば図６（Ａ）に示されるようにパッキンｄの環状凹部ｅよりも小さい場合、係合時に環状凸部ｇ外面と環状凹部ｅ内面との間に隙間が生じたり、あるいは図６（Ｂ）に示されるように環状凸部ｇが環状凹部ｅよりも大となった場合、押輪ｆにおける環状凸部ｇの外面とパッキンｄにおける環状凹部ｅ内面以外の対向端面間に隙間が生じる恐れがある。このような隙間が生じると、押輪ｆのパッキンｄへの押圧力の損失により、シール性が低下するといった問題があった。
【００１０】
本発明は、上記問題点を解決するためになされたもので、押輪が調心方向に確実に案内されるとともに、パッキンが確実に押圧され、シール性の高い管継手を提供することを目的としている。
【００１１】
【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パッキンを挾入する管継手であり、
前記パッキンは、挿口部に外嵌した押輪によって押圧される平面部を有し、前記パッキンにおける押輪側の端面内周縁の少なくとも上方領域に、押輪側に向って漸次テーパ状に拡開する第１舌片を設け、また、前記パッキンにおける押輪側の端面外周縁の少なくとも下方領域に、押輪側に向って漸次テーパ状に拡開する第２舌片を設け、前記押輪の調心時において、押輪の端面内周縁の上方領域が前記第１舌片の内面のテーパ面で、さらに押輪の端面外周縁の下方領域が前記第２舌片の内面のテーパ面でそれぞれ押輪が受口部とほぼ同軸をなす位置まで求心方向に押上げられるようにしたことを特徴としている。
この特徴によれば、押輪によりパッキンが平面的に押圧されるため、パッキンに均等な押し込み力を与えることが可能となるとともに、押輪を受口部に徐々に締め付けるに従って、押輪の押圧端面内周縁の上方領域が第１舌片の内面のテーパ面で、また、押輪の押圧端面外周縁の下方領域が第２舌片の内面のテーパ面でそれぞれ求心方向に押上げられるので、押輪と受口部との確実な調心が可能となる。
【００１２】
上記押輪の内径が、第１舌片の外径よりも若干小さく、かつ前記押輪の外径が第２舌片の内径よりも大径に形成されているのが好ましい。
このようにすることにより、押圧時において押輪の押圧端面によりパッキンの第１舌片が挿口部外周面方向に、また、第２舌片が挿口部内面方向に強く押し広げられるため、外部からの夾雑物の進入が確実に防止される。
【００１３】
【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。図１及び図２において、右方の管体１の開口端部に形成された受口部１ａ内には、左方の管体２の対向端部の挿口部２ａが余裕をもって挿入されている。
【００１４】
受口部１ａの開口端部内周面には、開口端側がテーパ状に拡径する環状凹部３が形成され、この環状凹部３と挿口部２ａの外周面との間に形成される環状空間４には、硬質ゴム等よりなるパッキン５が圧入されるようになっている。
【００１５】
パッキン５は、特に図３に示されるように、上記環状空間４とほぼ同形のリング状をなし、その左端部内周縁には、外方、すなわち後記する押輪６側に向って漸次テーパ状に拡径する環状の第１舌片５ａが連設されているとともに、左端部内周縁には、押輪６側に向って漸次テーパ状に拡径する環状の第２舌片５ｂが連設されている。また、これら第１・第２舌片５ａ、５ｂとの間には、押輪６側を向く平面状の端面５ｃ（平面部）が形成されている。さらにパッキン５の図中右側端部は、挿口部２ａの外周面と環状凹部３との間のシール性を向上すべく断面略球形状に形成されている。
【００１６】
６は、右方を向く環状押圧部６ａとフランジ部６ｂとからなる押輪で、パッキン５の左方の挿口部２ａに若干の遊びを持たせて外嵌されている。環状押圧部６ａの端面６ｃは平面状に形成され、また、この端面６ｃの内周縁から外周縁までの幅Ｌ１は、パッキン５の第１舌片５ａの外周縁から第２舌片５ｂの内周縁までの幅Ｌ２よりも若干幅広に形成されており、押輪６の端面６ｃがパッキン５の端面５ｃを押圧した時に第１舌片５ａが挿口部２ａの外周面方向に、また第２舌片５ｂが環状凹部３の内周面方向に押圧されるようになっている。
【００１７】
図４にはパッキン５の他の実施例が示されている。これは図中向かって右側端部が前述の実施例のように球形状に形成されていないものであるが、このように右側端部の形状は種々に変形可能である。
【００１８】
フランジ部６ｂと受口部１ａのフランジ部１ｂとは、複数のＴ頭ボルト７とナット８により締結される。
【００１９】
次に管体１、２の接続要領について説明する。まず、挿口部２ａの開口端より、押輪６とパッキン５を順に外嵌した状態で、挿口部２ａを受口部１ａ内に挿入する。そしてパッキン５を出来る限り環状凹部３内に押し込んでおくとよい。
【００２０】
ついで、受口部１ａと押輪６のそれぞれのフランジ部１ｂ、６ｂ同士にＴ頭ボルト７を挿通し、図１に示すようにナット８により仮止めする。
【００２１】
この状態での押輪６は、自重により、挿口部２ａの管頂に懸垂状態となっており、管底側に隙間が形成されている。
【００２２】
ついで、各ナット８を徐々に均等に締め付けると、まずパッキン５の第１舌片５ａ先端の管頂側及び第２舌片５ｂの先端管底側が、押輪６の端面６ｃの内周縁管頂側、及び端面６ｃの外周縁管底側にほぼ同時に当接される。
【００２３】
なおもナット８を締め込んでいくと、端面６ｃの管頂側の内周縁がパッキン５の第１舌片５ａ内面のテーパ面と、端面６ｃの管底側の外周縁が第２舌片５ｂの内面のテーパ面と、がそれぞれほぼ同時に当接して案内されることにより、押輪６全体は求心方向に押上げられる。例えばこのパッキン５が第１舌片５ａのみを有しているような場合は、押輪６の重量がパッキン上端（５ａ）のみにかかり、この上端部のパッキンが押し潰されてしまうことになり、求心力の低下をまねくことになるが、このように押輪６の環状押圧部６ａの上半部と下半部とが、それぞれ舌片５ａ、５ｂとで押し上げられるため、パッキンにかかる荷重が少くとも上下方向に分散され、求心力の低下をまねくことがない。
【００２４】
端面６ｃがパッキン５の端面５ｃに略平行な状態で密接すると、図２に示すように、受口部１ａと押輪６とは自動的にほぼ同軸となり、挿口部２ａの外周面と押輪６の内周面との間には、ほぼ均一な隙間が形成される。この時パッキン５の端面５ｃが平面状に形成されていることにより、パッキン５に均等な押圧力を与えることが可能となり、シール性が高まる。
【００２５】
従って、各ボルト７とナット８を均一なトルクで締め付ければ、パッキン５の押圧力も均一となり、シール性が損われる恐れはない。しかも、押輪６の端面６ｃの幅Ｌ１がパッキン５の端面５ｃの幅Ｌ２よりも若干幅広に形成されるようにすれば、押輪６の締め付け終了間際において、第１舌片５ａの基部が押輪６の端面６ｃの内周縁により挿口部２ａ外周面に、また第２舌片５ｂの基部が端面６ｃの外周縁により環状凹部３内面にそれぞれ強く圧接されるため、外部からの夾雑物等の進入が防止される。
【００２６】
なお、上記実施例においては、第１・第２舌片５ａ、５ｂをパッキン５の全周に形成したが、第１舌片５ａを上半周または管頂部付近に、また第２舌片５ｂは下半周又は管底部付近に円弧状に形成することもある。
【００２７】
【発明の効果】
本発明によれば、押輪によりパッキンが平面的に押圧されるため、パッキンに均等な押し込み力を与えることが可能となるとともに、押輪を受口部に徐々に締め付けるに従って、押輪の押圧端面内周縁の上方領域が第１舌片の内面のテーパ面で、また、押輪の押圧端面外周縁の下方領域が第２舌片の内面のテーパ面でそれぞれ求心方向に押上げられるので、押輪と受口部とは容易に同軸となる。また、このように押輪の上方、下方領域それぞれが、少なくとも第１・第２舌片により求心方向に押し上げられるので、押輪の重量によるパッキンの圧接力が分散され、求心力が高まる。
【００２８】
請求項２の発明によると、押圧時において押輪の押圧端面によりパッキンの第１舌片が挿口部外周面方向に、また、第２舌片が挿口部内面方向に強く押し広げられるため、外部からの夾雑物の進入が確実に防止される。
【００２９】
【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、押輪締付終了後の状態を示す中央縦断側面図である。
【図３】本発明のパッキン及び押輪を示す要部拡大断面図である。
【図４】本発明のパッキンの他の実施例を示す要部拡大断面図である。
【図５】（Ａ）（Ｂ）は従来例における押輪締付前と後の状態を示す中央縦断側面図である。
【図６】（Ａ）（Ｂ）は図５のパッキンと押輪との当接状態を示す要部拡大断面図である。
【符号の説明】
１、２管体
１ａ受口部
１ｂフランジ部
２ａ挿口部
３環状凹部
４環状空間
５パッキン
５ａ第１舌片
５ｂ第２舌片
５ｃ端面
６押輪
６ａ環状押圧部
６ｂフランジ部
６ｃ端面
７Ｔ頭ボルト
８ナット[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 piping a water pipe or the like, for connecting pipes, the insertion part of the other pipe is inserted into the reception part of one pipe, and an annular packing inserted between them is inserted into the insertion part. A pipe joint that is tightened by a push ring externally fitted to the part is used.
[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 coaxially with each other.
[0004]
In other words, the pusher wheel is fitted around the insertion port with a slight play gap, so that when the tube is connected, it is suspended from the top of the tube by the weight of the pusher wheel, causing a misalignment with respect to the receiving port. ing.
[0005]
If the push 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 fly out from the bottom of the pipe.
[0006]
As a solution to this problem, for example, there is a pipe joint disclosed in Japanese Utility Model Publication No. 3-51587.
[0007]
As shown in FIG. 5, this conventional pipe joint has an annular shape on the side surface of the packing d inserted into the gap c between the receiving part a of one pipe and the insertion part b of the other pipe. A groove e is formed, and an annular convex portion g is formed on the pressing surface of the press wheel f fitted to the insertion portion b.
[0008]
As shown in FIG. 5A, in a state where the pusher wheel f is suspended from the top of the insertion portion b, when the receiving part a and the pusher wheel f are tightened by the mounting bolts and nuts h, FIG. As shown in FIG. 5, the annular convex part g of the pusher wheel f is guided by the annular groove e of the packing d and pushed upward, so that the receiving part a and the pusher wheel f are automatically aligned on the same axis. become.
[0009]
[Problems to be solved by the invention]
However, especially when it is necessary to form the annular convex part g in the pressing part of the push ring f as in the conventional pipe joint described above, the processing is troublesome, and the annular convex part g is, for example, shown in FIG. 6 is smaller than the annular recess e of the packing d, a gap is formed between the outer surface of the annular projection g and the inner surface of the annular recess e at the time of engagement, or an annular shape as shown in FIG. When the convex part g becomes larger than the annular recessed part e, there exists a possibility that a clearance may be generated between the outer end surface of the annular convex part g in the press ring f and the opposing end face other than the inner surface of the annular recessed part e in the packing d. When such a gap is generated, there is a problem that the sealing performance is deteriorated due to the loss of the pressing force of the push wheel f to the packing d.
[0010]
The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a pipe joint having a high sealing performance in which a push ring is reliably guided in a centering direction and a packing is reliably pressed. Yes.
[0011]
[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. It is a pipe joint that inserts packing into the gap between the surface and
The packing has a flat surface portion pressed by a press ring externally fitted to the insertion portion, and gradually expands in a tapered shape toward the press wheel side in at least an upper region of the inner peripheral edge of the end surface on the press wheel side of the packing. 1 tongue piece is provided, and a second tongue piece gradually expanding in a tapered shape toward the press wheel side is provided in at least a lower region of the outer peripheral edge of the push wheel side of the packing. The upper region of the inner peripheral edge of the press ring is the tapered surface of the inner surface of the first tongue piece, and the lower region of the outer peripheral edge of the press wheel is the tapered surface of the inner surface of the second tongue piece. It is characterized in that it can be pushed up in the centripetal direction to a position where it is coaxial.
According to this feature, since the packing is pressed planarly by the press ring, it is possible to apply an equal pressing force to the packing, and as the press ring is gradually tightened to the receiving portion, the inner peripheral edge of the press end surface of the press ring The upper region of the first tongue piece is pushed up in the centripetal direction by the tapered surface of the inner surface of the first tongue piece, and the lower region of the outer peripheral edge of the pressing end surface of the push ring is pushed up in the centripetal direction. Certain alignment with the department becomes possible.
[0012]
It is preferable that the inner diameter of the push ring is slightly smaller than the outer diameter of the first tongue piece and the outer diameter of the push ring is larger than the inner diameter of the second tongue piece.
By doing so, the first tongue piece of the packing is strongly pushed toward the outer peripheral surface direction of the insertion portion and the second tongue piece is strongly pushed toward the inner surface direction of the insertion portion by the pressing end surface of the press ring at the time of pressing. Intrusion of foreign substances from is reliably prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, an insertion portion 2a at the opposite end of the left tubular body 2 is inserted into the receiving portion 1a formed at the opening end of the right tubular body 1 with a margin. Yes.
[0014]
An annular recess 3 whose opening end side has a tapered diameter is formed on the inner peripheral surface of the opening end portion of the receiving portion 1a, and an annular space formed between the annular recess 3 and the outer peripheral surface of the insertion portion 2a. 4, a packing 5 made of hard rubber or the like is press-fitted.
[0015]
As shown in FIG. 3 in particular, the packing 5 has a ring shape substantially the same shape as the annular space 4, and gradually expands outwardly, that is, toward the presser wheel 6, which will be described later, on the inner peripheral edge of the left end portion. An annular first tongue piece 5a having a diameter is continuously provided, and an annular second tongue piece 5b having a diameter gradually increasing toward the push wheel 6 is continuously provided on the inner peripheral edge of the left end portion. Further, a planar end surface 5c (plane portion) facing the push wheel 6 is formed between the first and second tongue pieces 5a and 5b. Further, the right end of the packing 5 in the drawing is formed in a substantially spherical cross section so as to improve the sealing performance between the outer peripheral surface of the insertion portion 2a and the annular recess 3.
[0016]
Reference numeral 6 denotes a press ring including an annular pressing portion 6a and a flange portion 6b facing rightward, and is fitted on the left insertion portion 2a of the packing 5 with some play. The end face 6c of the annular pressing portion 6a is formed in a flat shape, and the width L1 from the inner peripheral edge to the outer peripheral edge of the end face 6c is from the outer peripheral edge of the first tongue piece 5a of the packing 5 to the inner edge of the second tongue piece 5b. The first tongue piece 5a is formed in the direction of the outer peripheral surface of the insertion portion 2a and the second tongue when the end surface 6c of the press ring 6 presses the end surface 5c of the packing 5 and is formed to be slightly wider than the width L2 to the periphery. The piece 5 b is pressed in the direction of the inner peripheral surface of the annular recess 3.
[0017]
FIG. 4 shows another embodiment of the packing 5. This is because the right end portion is not formed in a spherical shape as in the above-described embodiment, but the shape of the right end portion can be variously modified in this way.
[0018]
The flange portion 6 b and the flange portion 1 b of the receiving portion 1 a are fastened by a plurality of T-head bolts 7 and nuts 8.
[0019]
Next, the connection procedure of the tubes 1 and 2 will be described. First, the insertion part 2a is inserted into the receiving part 1a from the opening end of the insertion part 2a in a state where the presser wheel 6 and the packing 5 are sequentially fitted. The packing 5 is preferably pushed into the annular recess 3 as much as possible.
[0020]
Next, T-head bolts 7 are inserted between the flange portions 1b and 6b of the receiving port portion 1a and the press ring 6 and temporarily fixed with a nut 8 as shown in FIG.
[0021]
The push wheel 6 in this state is suspended from the top of the insertion portion 2a by its own weight, and a gap is formed on the bottom side of the tube.
[0022]
Then, when each nut 8 is tightened gradually and uniformly, the tube top side of the tip of the first tongue piece 5a and the tip tube bottom side of the second tongue piece 5b of the packing 5 are first located on the inner peripheral pipe top side of the end surface 6c of the press ring 6 , And the outer peripheral pipe bottom side of the end face 6c are contacted almost simultaneously.
[0023]
When the nut 8 is further tightened, the inner peripheral edge on the tube top side of the end surface 6c is the tapered surface of the inner surface of the first tongue piece 5a of the packing 5, and the outer peripheral edge on the tube bottom side of the end surface 6c is the second tongue piece 5b. As a result, the entire push wheel 6 is pushed up in the centripetal direction. For example, when the packing 5 has only the first tongue piece 5a, the weight of the presser wheel 6 is applied only to the packing upper end (5a), and the packing at the upper end is crushed, Although the centripetal force is lowered, the upper half and the lower half of the annular pressing portion 6a of the pusher wheel 6 are pushed up by the tongue pieces 5a and 5b, respectively, so that the load applied to the packing is small. Dispersed in the vertical direction, it does not reduce the centripetal force.
[0024]
When the end surface 6c is in close contact with the end surface 5c of the packing 5 in a state of being substantially parallel to each other, as shown in FIG. 2, the receiving portion 1a and the press ring 6 are automatically substantially coaxial, and the outer peripheral surface of the insertion portion 2a and the press ring 6 A substantially uniform gap is formed between the inner circumferential surface and the inner circumferential surface. At this time, since the end surface 5c of the packing 5 is formed in a flat shape, it is possible to apply an equal pressing force to the packing 5 and the sealing performance is improved.
[0025]
Therefore, if the bolts 7 and the nuts 8 are tightened with a uniform torque, the pressing force of the packing 5 becomes uniform, and there is no fear that the sealing performance is impaired. In addition, if the width L1 of the end face 6c of the pusher wheel 6 is formed to be slightly wider than the width L2 of the end face 5c of the packing 5, the base portion of the first tongue piece 5a is just before the pusher wheel 6 is tightened. Since the inner peripheral edge of the end surface 6c is strongly pressed against the outer peripheral surface of the insertion portion 2a and the base of the second tongue piece 5b is strongly pressed against the inner surface of the annular recess 3 by the outer peripheral edge of the end surface 6c, entry of foreign matters and the like from the outside Is prevented.
[0026]
In the above embodiment, the first and second tongue pieces 5a and 5b are formed on the entire circumference of the packing 5. However, the first tongue piece 5a is located in the upper half circumference or near the top of the tube, and the second tongue piece 5b is It may be formed in an arc shape near the lower half or the bottom of the tube.
[0027]
【The invention's effect】
According to the present invention, since the packing is pressed planarly by the press ring, it is possible to apply an equal pressing force to the packing, and as the press ring is gradually tightened to the receiving portion, the inner peripheral edge of the press end surface of the press ring The upper region of the first tongue piece is pushed up in the centripetal direction by the tapered surface of the inner surface of the first tongue piece, and the lower region of the outer peripheral edge of the pressing end surface of the push ring is pushed up in the centripetal direction. The part is easily coaxial. In addition, since the upper and lower regions of the pusher wheel are pushed up in the centripetal direction by at least the first and second tongue pieces, the pressure contact force of the packing due to the weight of the pusher wheel is dispersed and the centripetal force is increased.
[0028]
According to the invention of claim 2, since the first tongue piece of the packing is strongly pushed and expanded in the insertion portion outer peripheral surface direction and the second tongue piece in the insertion portion inner surface direction by the pressing end surface of the push ring at the time of pressing, The entry of foreign matters from outside is reliably prevented.
[0029]
[Brief description of the drawings]
FIG. 1 is a central longitudinal cross-sectional 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 an enlarged cross-sectional view of a main part showing a packing and a press ring of the present invention.
FIG. 4 is an enlarged cross-sectional view showing a main part of another embodiment of the packing according to the present invention.
FIGS. 5A and 5B are central longitudinal cross-sectional side views showing states before and after tightening of a push ring in a conventional example. FIGS.
6 (A) and 6 (B) are enlarged cross-sectional views of main parts showing a contact state between the packing and the press ring of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 Tube 1a Receiving part 1b Flange part 2a Inserting part 3 Annular recessed part 4 Annular space 5 Packing 5a 1st tongue piece 5b 2nd tongue piece 5c End surface 6 Push ring 6a Annular press part 6b Flange part 6c End surface 7 T head Bolt 8 Nut

Claims

A pipe joint in which the insertion part of the other pipe is loosely inserted into the receiving part of one pipe, and a packing is inserted into the gap between the inner peripheral surface of the receiving part and the outer peripheral surface of the insertion part. Yes,
The packing has a flat surface portion pressed by a press ring externally fitted to the insertion portion, and gradually expands in a tapered shape toward the press wheel side in at least an upper region of the inner peripheral edge of the end surface on the press wheel side of the packing. 1 tongue piece is provided, and a second tongue piece gradually expanding in a tapered shape toward the press wheel side is provided in at least a lower region of the outer peripheral edge of the push wheel side of the packing. The upper region of the inner peripheral edge of the press ring is the tapered surface of the inner surface of the first tongue piece, and the lower region of the outer peripheral edge of the press wheel is the tapered surface of the inner surface of the second tongue piece. A pipe joint characterized by being pushed up in the centripetal direction up to a coaxial position.

2. The press ring according to claim 1, wherein an inner diameter of the press ring is slightly smaller than an outer diameter of the first tongue piece, and an outer diameter of the press ring is slightly larger than an inner diameter of the second tongue piece. Pipe fittings.