JP2006138438A - Universal pipe joint - Google Patents

Universal pipe joint Download PDF

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JP2006138438A
JP2006138438A JP2004330284A JP2004330284A JP2006138438A JP 2006138438 A JP2006138438 A JP 2006138438A JP 2004330284 A JP2004330284 A JP 2004330284A JP 2004330284 A JP2004330284 A JP 2004330284A JP 2006138438 A JP2006138438 A JP 2006138438A
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pipe
shell
core
joint
pipe joint
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JP4373894B2 (en
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Takayoshi Tanaka
高好 田中
Hiroichi Hasegawa
博一 長谷川
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Aron Kasei Co Ltd
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Aron Kasei Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve flushing without forming a reduced pipe part in a universal pipe joint using a flexible pipe. <P>SOLUTION: This universal pipe joint 1 is composed of a shell 2 and a core 3 sliding on an inner surface of the shell 2, and a joint pipe preventing a waste material sump is formed by arranging the flexible pipe 6 over an inner diameter side base part of these shell 2 and core 3. A stopper without abutting on the flexible pipe 6 even when the core 3 maximally freely changes, is arranged in the shell 2, without forming a reduced pipe part on the pipe top side of the flexible pipe 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、自在管継手に関するものである。   The present invention relates to a universal pipe joint.

一般に、球関節をもち、任意の回転が可能なボ−ル継手は管路にも用いられて、部分的な球面の滑動面をもち、角変位（自在振り角変位ともいう）を可能とするボ−ル管継手と称せられて汎用されている。   In general, a ball joint having a ball joint and capable of arbitrary rotation is also used in a pipe line, and has a partial spherical sliding surface, which enables angular displacement (also referred to as free swing angular displacement). It is called a ball joint and is widely used.

かかるボ−ル管継手は、ポリエチレンや塩ビ等の合成樹脂製管路にも適用され、現在、自在管継手と称せられて汎用されている。   Such ball pipe joints are also applied to synthetic resin pipes such as polyethylene and polyvinyl chloride, and are now commonly used as universal pipe joints.

かかる自在管継手は基本的には、部分的な球面のシエルとこれに内接するコア（塊状部材）とからなる自在管継手になっている。   Such a universal pipe joint is basically a universal pipe joint composed of a partial spherical shell and a core (bulk member) inscribed therein.

かかる基本的な自在管継手についての１つの提案（特許文献１）を述べる。   One proposal (Patent Document 1) for such a basic universal pipe joint will be described.

この提案の自在管継手は部分的な球面のシエルと、このシエルに自在に内接する塊状のコアとからなり、このシエルの一端側には管路を形成する差口部が一体に設けられ、コアの他端側の内面には受口部が内嵌固着されている。   This proposed universal pipe joint is composed of a partial spherical shell and a lump core that is freely inscribed in the shell, and at one end of the shell, an opening portion that forms a pipe line is provided integrally. A receiving portion is fitted and fixed to the inner surface of the other end side of the core.

そして、この差口部には下流管が、受口部には上流管がそれぞれ接続するようになっている。   A downstream pipe is connected to the differential port, and an upstream pipe is connected to the receiving port.

ここにおいて、この提案の自在管継手は、特に、前記受口部の内面と、コアの内面とにわたり合成ゴムからなる伸縮自在の弾性筒により、当該継手を自在変化させても、例えば流路勾配を大きくしても、この弾性筒の管底側が伸び、そこに極端な凹部ができず、ひいては、固形物の溜りを防ぐ、とされている。
特開２００３−３２９１８２号公報 In this case, the proposed universal pipe joint can be used, for example, even if the joint is freely changed by a stretchable elastic cylinder made of synthetic rubber over the inner surface of the receiving portion and the inner surface of the core. Even if the diameter is increased, the tube bottom side of the elastic cylinder extends, and an extreme concave portion is not formed there.
JP 2003-329182 A

かかる自在管継手では、流路勾配を大きくとると、継手内管路頂部側に塊状のコアの内端側が突出し、伸縮自在の弾性筒を変形させて管路狭窄部を形成することにより、満管流による折角のフラッシュ効果を阻害する、という問題がある。   In such a universal pipe joint, when the flow path gradient is increased, the inner end side of the massive core protrudes from the pipe inner pipe top side, and the elastic elastic cylinder is deformed to form the pipe narrowed portion. There is a problem that the flushing effect of the corners caused by the tube flow is inhibited.

また、この自在管継手では弾性筒が伸縮することから、管路掃除棒体を挿入すると、その先端が弾性筒に当接して該弾性筒を変形させ更なる挿入が困難となったり、突き破るおそれがあったりする問題がある。   Further, in this universal pipe joint, since the elastic cylinder expands and contracts, when the pipe cleaning rod is inserted, the tip of the pipe contacts the elastic cylinder and the elastic cylinder may be deformed, making further insertion difficult or breaking through. There is a problem that there is.

かかる課題を解決するため、本発明は、１）１対の部分球面状摺動面をもつ合成樹脂製自在管継手において、該摺動面の１つをシエルで構成し、該シエル内面に、他の１つの該摺動面をもつコアを設け、これらのシエル・コアの内径側基部にわたる可撓管を設けて継手管路を形成した合成樹脂製自在管継手にあって、前記コアが、自在変化時にも前記可撓管に当接しないストッパ−を、シエルに設けて、該コアによる管路狭窄部を形成しないようにしたことを特徴とする合成樹脂製自在管継手にあり、また、２）１対の部分球面状摺動面をもつ合成樹脂製自在管継手において、該摺動面の１つをシエルで構成し、該シエル内面に、他の１つの前記該摺動面をもつコアを設け、これらのシエル・コアの内径側基部にわたる可撓管を設けて継手管路を形成した合成樹脂製自在管継手にあって、前記可撓管を内面平滑で、かつ、そのヒダに強度をもたせたコルゲ−ト管で構成すると共に、該コルゲ−ト管の両端を嵌合支持部で支持することにより、自在変化時にも前記コアによる管路狭窄部を形成しないようにしたことを特徴とする合成樹脂製自在管継手を要旨とする。   In order to solve this problem, the present invention provides: 1) In a synthetic resin universal pipe joint having a pair of partially spherical sliding surfaces, one of the sliding surfaces is constituted by a shell, and on the inner surface of the shell, A synthetic resin universal pipe joint in which a core having one other sliding surface is provided and a flexible pipe is provided over the inner diameter side base of these shell cores to form a joint pipe, A synthetic resin universal pipe joint characterized in that a stopper that does not contact the flexible pipe even when freely changing is provided on the shell so as not to form a pipe narrowing portion by the core, 2) In a synthetic resin universal pipe joint having a pair of partially spherical sliding surfaces, one of the sliding surfaces is constituted by a shell, and the other inner surface of the shell is provided with the other sliding surface. Provide a core and a flexible tube over the inner diameter base of these shell cores. The flexible pipe joint made of synthetic resin is formed of a corrugated pipe whose inner surface is smooth and has strength at its folds, and both ends of the corrugated pipe are fitted. The gist of the present invention is a synthetic resin universal pipe joint characterized in that the pipe narrowed portion is not formed by the core even when freely changed by being supported by the support portion.

請求項１の発明によると、コアのストッパ−を設けたので、継手管路をその管軸を可及的に大きくとった可撓管に構成しながら、当該管軸手を最大に自在変化させても、そのコアの端部が継手管路の全周、特に管頂側に突出せず、したがって、管路狭窄部を形成せず、これを下水設備に適用すれば、汚物溜まりのないことに併せて、フラッシュ効果を得ることができ、ひいては、自在変化角度を大きくとることができる。   According to the first aspect of the present invention, since the core stopper is provided, it is possible to change the pipe shaft hand as freely as possible while constructing the joint pipe as a flexible pipe having the pipe axis as large as possible. However, the end of the core does not protrude to the entire circumference of the joint pipe line, particularly the pipe top side, and therefore does not form a pipe narrowing part. At the same time, the flash effect can be obtained, and as a result, the freely changing angle can be increased.

請求項２の発明によると、内面平滑で、かつ、ヒダに強度をもたせたコルゲ−ト管を長寸の継手管路に構成したので、ヒダの変形抵抗力により、自在変化させても全内面を滑らかな弯曲面とすることができると共に、コルゲ−ト管の両端を凹凸のない嵌合支持部で支持するので、前記滑らかな弯曲面に更に資すると共に、その組立作業を容易にすることができ、その上、掃除棒等の挿入を容易とすることができる。   According to the invention of claim 2, since the corrugated pipe which is smooth on the inner surface and has strength on the folds is formed into a long joint pipe line, the entire inner surface can be freely changed by the deformation resistance force of the folds. Can be made a smooth curved surface, and both ends of the corrugated tube are supported by the fitting support portions without irregularities, so that the smooth curved surface can be further contributed and the assembly work can be facilitated. In addition, the insertion of a cleaning stick or the like can be facilitated.

本発明を添付図面に示す実施例により詳細に述べる。   The invention will be described in more detail by means of an embodiment shown in the accompanying drawings.

図１は本発明の実施例の断面図（自在変化前の縦断面図）、図２は図１の説明図（自在変化後の一部断面図）である。   FIG. 1 is a cross-sectional view of an embodiment of the present invention (longitudinal cross-sectional view before flexible change), and FIG. 2 is an explanatory view of FIG.

先ず、本発明の実施例の概要を述べる。   First, an outline of an embodiment of the present invention will be described.

本発明の実施例は、塩ビ管同士や塩ビ管と塩ビますの接続部とを接続するために用いる塩ビ製自在管継手１であって、一方の接続口（ゴム輪受口）４と一体成形（ブロ−成形等）した部分球面をもつ外側のシエル２と、この接続口４の反対側であって、自在変化前に同一直線状管軸ａにある他方の接続口（差口）（または自在管継手が一体化された、ます本体接続部）５と一体化した部分球面をもち、かつ、内側の管路を直接形成しないコア３と、からなり、この自在管継手１にあって、これらのシエル２、コア３の各内径の管路側にわたり１つの管路長さを大きくとった可撓管６を設け、しかも、該コア３を、前記他方の接続口５に設けられ、かつ、外面に部分球面を形成して前記シエル２の内面で滑動する環状体７で構成し、その環状体７は当該自在管継手１が最大に自在変化（例えば片側１５度）しても、その自由端たる端部が前記可撓管６に当接しない薄片に構成していて、しかも所定の継手強度をもたせている。   An embodiment of the present invention is a PVC universal pipe joint 1 used for connecting PVC pipes to each other and a connection part between a PVC pipe and a PVC pipe, and is integrally formed with one connection port (rubber ring receiving port) 4. The outer shell 2 having a partially spherical surface (such as blow molding) and the other connection port (differential port) on the opposite side of the connection port 4 and on the same straight tube axis a before the flexible change (or The universal pipe joint is integrated with the core 3 which has a partial spherical surface integrated with the main body connecting part 5 and does not directly form the inner pipe line. A flexible pipe 6 having a large pipe length is provided over the inner diameter side of the shell 2 and the core 3, and the core 3 is provided at the other connection port 5, and An annular body 7 is formed by forming a partial spherical surface on the outer surface and sliding on the inner surface of the shell 2. Even if the universal pipe joint 1 is maximally freely changed (for example, 15 degrees on one side), the free end is configured as a thin piece that does not contact the flexible pipe 6 and has a predetermined joint strength. I'm giving it back.

したがって、この自在管継手１では、内、外のシエル、コア２、３が継手強度を保ちながら自在振り角の変位を担持する第１の部材を構成し、このシエル、コア２、３の内径側にあって、これらのシエル、コア２、３の管路側全面から間隔を設けて長寸の管路を形成し、かつ、前記自在振り角の変位に追随する可撓管６たる第２の部材を構成し、これらの機能分担した第１、第２の部材からなる自在管継手１にしたから、次のような効果を奏するに至った。   Therefore, in this universal pipe joint 1, the inner and outer shells, the cores 2, 3 constitute a first member that carries the displacement of the free swing angle while maintaining the joint strength, and the inner diameters of the shells, the cores 2, 3 A second pipe which is a flexible pipe 6 which forms a long pipe line at a distance from the entire pipe line side of these shells and cores 2 and 3 and which follows the displacement of the free swing angle. Since the members are configured to be the universal pipe joint 1 composed of the first and second members that share these functions, the following effects are achieved.

（イ）可撓管６は長寸に構成できて、かつ、継手強度を必要としない。   (A) The flexible tube 6 can be configured to be long and does not require joint strength.

（ロ）特に、コア３を薄片で構成しているので、自在変位ができるスペ−スが確保され、最大自在変化をしても、すなわち、シエル２の凹内面で大きく摺動させても、なおかつ、シエル２に付設したストッパ−にコア３の内面が当接するので、コア３の端部が管路側に突出せず、ひいては、管路狭窄部を形成しない。   (B) In particular, since the core 3 is formed of a thin piece, a space capable of free displacement is ensured, and even when the maximum free change is made, that is, even if the core 2 is slid largely on the concave inner surface, In addition, since the inner surface of the core 3 comes into contact with the stopper attached to the shell 2, the end portion of the core 3 does not protrude toward the pipe line, and as a result, no pipe narrowing part is formed.

（ハ）更に、可撓管６を内面平滑の２重のコルゲ−ト管（波形管ともいい、管壁外面にヒダ１２を付し、伸縮や弯曲が容易な管をいい、例えば合成樹脂製波形管を更に伸縮するため独立または螺旋状補強線体を管壁に埋蔵したものをいう）にすると、内面が一層平滑性にすぐれ、しかも、継手の維持管理が良好にできる。   (C) Further, the flexible tube 6 is a double corrugated tube with a smooth inner surface (also referred to as a corrugated tube, with a pleat 12 on the outer surface of the tube wall, which can be easily expanded and contracted, for example, made of synthetic resin. If the corrugated tube is further expanded and contracted, an independent or spiral reinforcing wire body is embedded in the tube wall), the inner surface is more smooth and the maintenance of the joint can be improved.

（ニ）また、コア３側を可及的に停止させた使用法の場合や、コア３をます本体の開口部に設けて固定したときの使用法の場合には、シエル２のみが最大限滑動することになって、その結果、管路狭窄部を発生させない。   (D) In addition, in the case of usage where the core 3 side is stopped as much as possible, or in the usage where the core 3 is provided and fixed in the opening of the main body, only the shell 2 is the maximum. As a result, the pipe stenosis is not generated.

次に、本実施例の自在管継手１を詳細に述べる。   Next, the universal pipe joint 1 of the present embodiment will be described in detail.

本実施例の塩ビ製自在管継手１を、例えば呼び径７５ｍｍφ、１００ｍｍφ、１５０ｍｍφ、または２００ｍｍφの排水設備に用いた場合、自在振り角θを大きく形成（例えば片側１５度）した状態でも、その管路底部側には滑らかな弯曲面８を形成し、排水の流れによるフラッシング効果を発生可能として、いわゆる汚物溜りを形成させないようにしている。   When the polyvinyl chloride universal pipe joint 1 of this embodiment is used in a drainage facility having a nominal diameter of 75 mmφ, 100 mmφ, 150 mmφ, or 200 mmφ, for example, the pipe can be used even when the free swing angle θ is formed large (for example, 15 degrees on one side). A smooth saddle curved surface 8 is formed on the road bottom side so that a flushing effect due to the flow of drainage can be generated, so that a so-called filth reservoir is not formed.

前記外側のシエル２と、リップ付シ−ル２１を装着するゴム輪受口用溝９とはその全体を射出成形、またはコ−ルドパリソン法によるブロ−成形するときに形成する。   The outer shell 2 and the rubber ring receiving groove 9 in which the seal 21 with lip is mounted are formed when the whole is formed by injection molding or blow molding by the cold parison method.

このシエル２の内径側の膨出基部側には、内向突条で構成したゴム輪受口ストッパ−１０を形成した第１の取付リング１１を内嵌して接着固定している。   A first mounting ring 11 having a rubber ring receiving stopper 10 formed of an inward protrusion is fitted and fixed to the bulging base side on the inner diameter side of the shell 2.

この第１の取付リング１１におけるゴム輪受口ストッパ−１０の反ゴム輪受口側には、前記可撓管６の一端側における外面のヒダ１２を抱持する半割りリング１３を接着内嵌合して該可撓管６の一端を片持ち状に支持するようにして管路内面を平滑化している。   A half ring 13 for holding the outer fold 12 on one end side of the flexible tube 6 is adhesively fitted to the rubber ring receiving stopper 10 of the first mounting ring 11 on the side opposite to the rubber ring receiving end. In addition, the inner surface of the conduit is smoothed so that one end of the flexible tube 6 is cantilevered.

したがって、この第１の取付リング１１は環体で形成され、その内面軸方向中央に突条があって、一方側をゴム輪受口ストッパ−１０とし、他方側を可撓管６の一端を支持する短筒状内嵌合支持部２２にした断面略Ｔ字状に形成しているので、１つの部材で受口ストッパ−１０と、可撓管嵌合支持部と、コア３の自在変化ストッパ−と、の機能を兼用して果し、構造簡素化部品点数節減化に資している。   Accordingly, the first mounting ring 11 is formed of a ring, and has a protrusion at the center in the axial direction of the inner surface. One side is a rubber ring receiving stopper 10 and the other side is one end of the flexible tube 6. Since it is formed in a substantially T-shaped cross section that is a short cylindrical inner fitting support portion 22 to be supported, the receiving stopper 10, the flexible tube fitting support portion, and the core 3 can be freely changed with one member. It also serves as a stopper and contributes to a simplified structure and a reduced number of parts.

特に、この環体の第１の取付リング１１の自由端側外面を、環状体のコア３の自由端が当接するようにした自在変化用ストッパ−としており、ひいては、環状体のコア３の自由端が可撓管６に当接しないようにしている。   In particular, the outer surface on the free end side of the first mounting ring 11 of the ring is used as a freely changing stopper so that the free end of the ring-shaped core 3 abuts. The end is prevented from contacting the flexible tube 6.

前記内側のコア３を支持する第２の取付リング１４と、差口たる接続口５とは、全体を射出成形するときに形成される。   The second mounting ring 14 that supports the inner core 3 and the connection port 5 that is the insertion port are formed when the whole is injection-molded.

この第２の取付リング１４の外面の一部は、継手管路を直接形成しない薄片状のコア３の延長部を構成すると共に、その外面の残部には、係止溝１５とシ−ル溝１６とを並設している。   A part of the outer surface of the second mounting ring 14 constitutes an extension of the flaky core 3 that does not directly form a joint pipe line, and the rest of the outer surface has a locking groove 15 and a seal groove. 16 are juxtaposed.

この係止溝１５には、コア３の内面に設けた突条１７が嵌合し、シ−ル溝１６のＯリングでシ−ルすることにより、第２の取付リング１４とコア３とを密接一体化している。   A protrusion 17 provided on the inner surface of the core 3 is fitted into the locking groove 15 and sealed with an O-ring of the seal groove 16, thereby connecting the second mounting ring 14 and the core 3. Close integration.

したがって、この薄片のコア３を組付容易としながら、それ自体は単独で滑動ないし妄動せず、内側の球面接合部として良好に機能するようにしている。   Therefore, while making the thin core 3 easy to assemble, it does not slide or detach itself, and functions as an inner spherical joint.

このコア３には、外面を部分球面に形成して前記シエル２の内面で滑動するようにし、その球面の最大径の外面にＯリング溝１８を周設し、Ｏリング１９を装着している。   The outer surface of the core 3 is formed as a partial spherical surface so as to slide on the inner surface of the shell 2, an O-ring groove 18 is provided around the outermost surface of the spherical surface, and an O-ring 19 is attached. .

したがって、このシエル２とコア３とにより、自在管継手１の強度と水密性と自在振り角θとの各機能を担持するようにしている。   Therefore, the shell 2 and the core 3 support the functions of the strength, water tightness, and free swing angle θ of the universal pipe joint 1.

また、前記のように第２の取付リング１４はコア３の基部を形成しているが、この第２の取付リング１４の若干拡径した内面には、前記可撓管６の他端側おける外面のヒダ１２を抱持する半割リング２０を接着嵌合して、該可撓管６の他端を片持状に短筒状内嵌支持する嵌合支持部２３を形成している。   Further, as described above, the second mounting ring 14 forms the base of the core 3, but the inner surface of the second mounting ring 14 having a slightly enlarged diameter is provided on the other end side of the flexible tube 6. A half ring 20 that holds the folds 12 on the outer surface is adhesively fitted to form a fitting support portion 23 that supports the other end of the flexible tube 6 in a cantilevered manner.

したがって、この可撓管６はその両端側の短筒状の第１、第２の取付リング１１、１４に形成された嵌合支持部２２、２３により両端を支持しているので、その管軸が大きくとれ、しかも、自在変化の時でも極端な弯曲をせず、ひいては、管路内面を平滑化して汚物溜りや管路狭窄部を形成しないことに資している。   Therefore, since this flexible tube 6 supports both ends by the fitting support portions 22 and 23 formed in the first and second mounting rings 11 and 14 in the short cylindrical shape on both ends thereof, the tube shaft In addition, it does not bend excessively even when freely changing, and thus contributes to smoothing the inner surface of the pipe and not forming a filth reservoir or pipe stenosis.

本発明の実施例の断面図である。It is sectional drawing of the Example of this invention. 図１の説明図である。It is explanatory drawing of FIG.

符号の説明Explanation of symbols

１ 自在管継手
２ シエル
３ コア
６ 可撓管
７ 環状体
１２ ヒダ DESCRIPTION OF SYMBOLS 1 Universal pipe joint 2 Ciel 3 Core 6 Flexible pipe 7 Toroid 12 Tear

Claims (2)

１対の部分球面状摺動面をもつ合成樹脂製自在管継手において、
該摺動面の１つをシエルで構成し、該シエル内面に、他の１つの該摺動面をもつコアを設け、これらのシエル・コアの内径側基部にわたる可撓管を設けて継手管路を形成した合成樹脂製自在管継手にあって、
前記コアが、自在変化時にも前記可撓管に当接しないストッパ−を、シエルに設けて、該コアによる管路狭窄部を形成しないようにしたことを特徴とする合成樹脂製自在管継手。 In a synthetic resin universal pipe joint having a pair of partial spherical sliding surfaces,
One of the sliding surfaces is constituted by a shell, a core having the other sliding surface is provided on the inner surface of the shell, and a flexible pipe is provided over the inner diameter side base of these shell cores, thereby providing a joint pipe. In the synthetic resin universal pipe joint that formed the path,
A synthetic resin universal pipe joint characterized in that a stopper that does not come into contact with the flexible pipe even when the core is freely changed is provided on the shell so as not to form a pipe narrowing portion by the core. １対の部分球面状摺動面をもつ合成樹脂製自在管継手において、
該摺動面の１つをシエルで構成し、該シエル内面に、他の１つの前記該摺動面をもつコアを設け、これらのシエル・コアの内径側基部にわたる可撓管を設けて継手管路を形成した合成樹脂製自在管継手にあって、
前記可撓管を内面平滑で、かつ、そのヒダに強度をもたせたコルゲ−ト管で構成すると共に、該コルゲ−ト管の両端を嵌合支持部で支持することにより、自在変化時にも前記コアによる管路狭窄部を形成しないようにしたことを特徴とする合成樹脂製自在管継手。 In a synthetic resin universal pipe joint having a pair of partial spherical sliding surfaces,
One of the sliding surfaces is constituted by a shell, a core having the other sliding surface is provided on the inner surface of the shell, and a flexible tube is provided over the inner diameter side base of these shell cores. In a synthetic resin universal pipe joint that forms a pipe,
The flexible tube is formed of a corrugated tube having a smooth inner surface and strength at the folds, and both ends of the corrugated tube are supported by fitting support portions, so that the flexible tube A synthetic resin universal pipe joint characterized by not forming a pipe constriction by a core.
JP2004330284A 2004-11-15 2004-11-15 Universal pipe joint Active JP4373894B2 (en)

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Application Number Priority Date Filing Date Title
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JP2006138438A true JP2006138438A (en) 2006-06-01
JP4373894B2 JP4373894B2 (en) 2009-11-25

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100743546B1 (en) 2007-05-09 2007-07-27 주식회사 삼경 The undergroung pipe with function for preventing damage
JP2008019970A (en) * 2006-07-12 2008-01-31 Suiken:Kk Telescopic universal joint
JP2009041657A (en) * 2007-08-08 2009-02-26 Mitsubishi Plastics Inc Universal pipe joint
CN114811226A (en) * 2022-03-29 2022-07-29 江西嘉特信工程技术有限公司 Novel flexible connection device for drainage pipe at bridge expansion joint

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008019970A (en) * 2006-07-12 2008-01-31 Suiken:Kk Telescopic universal joint
KR100743546B1 (en) 2007-05-09 2007-07-27 주식회사 삼경 The undergroung pipe with function for preventing damage
JP2009041657A (en) * 2007-08-08 2009-02-26 Mitsubishi Plastics Inc Universal pipe joint
CN114811226A (en) * 2022-03-29 2022-07-29 江西嘉特信工程技术有限公司 Novel flexible connection device for drainage pipe at bridge expansion joint
CN114811226B (en) * 2022-03-29 2023-10-13 江西嘉特信工程技术有限公司 Novel bridge expansion joint department drain pipe flexible coupling device

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