JPH04258594A - Electric fusion joint - Google Patents

Electric fusion joint

Info

Publication number
JPH04258594A
JPH04258594A JP3020773A JP2077391A JPH04258594A JP H04258594 A JPH04258594 A JP H04258594A JP 3020773 A JP3020773 A JP 3020773A JP 2077391 A JP2077391 A JP 2077391A JP H04258594 A JPH04258594 A JP H04258594A
Authority
JP
Japan
Prior art keywords
resin pipe
electric fusion
fusion joint
diameter
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3020773A
Other languages
Japanese (ja)
Inventor
Hideyo Yoshikawa
吉川　秀世
Tsutomu Ubagai
勉 祖母井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP3020773A priority Critical patent/JPH04258594A/en
Publication of JPH04258594A publication Critical patent/JPH04258594A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/565—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52296—Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52297—Joining tubular articles involving the use of a socket said socket comprising slip-off prevention means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic

Abstract

PURPOSE:To provide an electric fusion joint capable of preventing fallout of a resin pipe from the electric fusion joint, and of restricting the influence of faulty fusion to such degree that water leaks occur even when the fusion is defective. CONSTITUTION:The electric fusion joint is an electric fusion joint 1 in which a coil 3 which is heated by applying electricity is buried in a resin pipe body 2, groove parts 21 are provided on the inner peripheral surface of the resin pipe body 2, and diameter-reduction members 4 made of shape memory alloy, whose diameters are reduced by heat generating at the time of fusing, are provided in the groove parts 21.

Description

【発明の詳細な説明】[Detailed description of the invention]

【０００１】0001

【産業上の利用分野】本発明は、樹脂管本体に、通電に
よって発熱するコイルが埋設されてなる電気融着継手に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion joint in which a coil that generates heat when energized is embedded in a resin pipe body.

【０００２】0002

【従来の技術】従来より、図４に示すように、樹脂管本
体ｂに、通電によって発熱するコイルｃが埋設されてな
る電気融着継手ａが知られている。すなわち、この電気
融着継手ａの使用方法は、まず、接続しようとする樹脂
管ｄの端部を樹脂管本体ｂ内に挿入する。そして、通電
ターミナルｅから通電してコイルｃを発熱させ、樹脂管
ｄと樹脂管本体ｂとの嵌合部分を溶融させて、この両者
を接続するものである。2. Description of the Related Art Conventionally, as shown in FIG. 4, an electric fusion joint a is known in which a coil c that generates heat when energized is embedded in a resin pipe body b. That is, the method of using this electric fusion joint a is to first insert the end of the resin pipe d to be connected into the resin pipe body b. Then, electricity is applied from the current terminal e to generate heat in the coil c, thereby melting the fitting portion between the resin pipe d and the resin pipe main body b, thereby connecting the two.

【０００３】0003

【発明が解決しようとする課題】しかし、上記従来の電
気融着継手ａにあっては、外部からその融着状態を把握
することができないため、施工のばらつきで融着不良が
発生したような場合、電気融着継手ａから樹脂管ｄが抜
けてしまうといった致命的な漏水事故を発生する恐れが
ある。[Problem to be Solved by the Invention] However, in the conventional electric fusion joint a mentioned above, it is not possible to check the fusion state from the outside, so there is a possibility that fusion failure may occur due to variations in construction. In this case, there is a risk of a fatal water leakage accident in which the resin pipe d comes off from the electric fusion joint a.

【０００４】本発明は、係る実情に鑑みてなされたもの
で、融着不良が発生したような場合であっても、電気融
着継手ａから樹脂管ｄが抜けるのを防止し、漏水程度に
食い止めることのできる電気融着継手を提供することを
目的としている。[0004] The present invention was made in view of the above-mentioned circumstances, and even if a fusion failure occurs, the resin pipe d is prevented from coming off from the electric fusion joint a, and water leakage is reduced to the extent possible. The purpose is to provide an electric fusion joint that can prevent

【０００５】[0005]

【課題を解決するための手段】本発明の電気融着継手は
、樹脂管本体に、通電によって発熱するコイルが埋設さ
れてなる電気融着継手であって、樹脂管本体の内周面に
溝部が周設され、該溝部内に、電気融着時の熱によって
縮径する形状記憶合金製の縮径部材が設けられたもので
ある。[Means for Solving the Problems] The electric fusion joint of the present invention is an electric fusion joint in which a coil that generates heat when energized is embedded in a resin pipe body, and has a groove on the inner peripheral surface of the resin pipe body. is provided around the groove, and a diameter-reducing member made of a shape memory alloy whose diameter is reduced by heat during electric fusion is provided in the groove.

【０００６】[0006]

【作用】本発明の電気融着継手は、樹脂管本体内に、接
続しようとする樹脂管の端部を挿入した後、該樹脂管本
体に埋設されたコイルに通電することによって樹脂管と
接続される。この際、樹脂管本体の内周面に周設された
溝部内に、電気融着時の熱によって縮径する縮径部材を
設けているので、該縮径部材は、融着状態の是非に関わ
らず、溝部内に設けられた状態で、樹脂管の外周面に固
着することとなる。[Operation] The electric fusion joint of the present invention connects the resin pipe by inserting the end of the resin pipe to be connected into the resin pipe body and then energizing the coil embedded in the resin pipe body. be done. At this time, a diameter-reducing member is provided in the groove provided on the inner circumferential surface of the resin pipe body, and the diameter-reducing member reduces the diameter by the heat generated during electric fusion. Regardless, it will be fixed to the outer circumferential surface of the resin pipe while being provided within the groove.

【０００７】[0007]

【実施例】以下、本発明の一実施例を図面を参照して説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

【０００８】図１は、電気融着継手１の全体構成の概略
を示している。すなわち、この電気融着継手１は、樹脂
管本体２に、通電によって発熱するコイル３が埋設され
るとともに、該樹脂管本体２の内周面に溝部２１が周設
され、該溝部２１内に、電気融着時の熱によって縮径す
る形状記憶合金製の縮径部材４が設けられたものである
。FIG. 1 schematically shows the overall structure of an electric fusion joint 1. As shown in FIG. That is, in this electric fusion joint 1, a coil 3 that generates heat when energized is embedded in a resin tube body 2, and a groove 21 is provided around the inner peripheral surface of the resin tube body 2. A diameter-reducing member 4 made of a shape-memory alloy whose diameter is reduced by heat during electric fusion is provided.

【０００９】樹脂管本体２は、円筒状に形成されてなり
、その両端部から、該樹脂管本体２の内周全体に渡って
、樹脂管５の端部を嵌合できるようになされた嵌合部２
０が形成されている。この嵌合部２０の端部近傍には、
溝部２１が周設されている。また、中央部には、樹脂管
５の貫通を抑止するストッパ２２が突設されている。そ
して、この溝部２１とストッパ２２との間には、通電に
よって発熱するコイル３が埋設されている。The resin pipe main body 2 is formed into a cylindrical shape, and a fitting is provided from both ends of the resin pipe main body 2 over the entire inner circumference of the resin pipe main body 2 so that the end of the resin pipe 5 can be fitted into the resin pipe main body 2. Joint part 2
0 is formed. Near the end of this fitting part 20,
A groove portion 21 is provided around the periphery. Further, a stopper 22 that prevents the resin pipe 5 from penetrating is provided in the center. A coil 3 that generates heat when energized is buried between the groove 21 and the stopper 22.

【００１０】コイル３は、発熱によって、該コイル３周
縁の樹脂を溶融させるようになされている。すなわち、
嵌合部２０に樹脂管５を挿入してコイル３に通電するこ
とで、嵌合部２０の内周壁面と樹脂管５の外周壁面とが
溶融して融着することとなる。そのため、コイル３は、
嵌合部２０のうち、溝部２１とストッパ２２との間全体
を周回して埋設され、融着による接合面積を充分に確保
することができるようになされている。このコイル３は
、その端部が、嵌合部２０の外周に突設された通電ター
ミナル３０に配線されており、該通電ターミナル３０か
ら通電できるようになされている。The coil 3 is designed to melt the resin around the periphery of the coil 3 by generating heat. That is,
By inserting the resin pipe 5 into the fitting part 20 and energizing the coil 3, the inner circumferential wall surface of the fitting part 20 and the outer circumferential wall surface of the resin tube 5 are melted and fused together. Therefore, coil 3 is
The fitting portion 20 is buried entirely around the groove portion 21 and the stopper 22 to ensure a sufficient bonding area by fusion bonding. The end of the coil 3 is wired to an energizing terminal 30 protruding from the outer periphery of the fitting portion 20, so that it can be energized from the energizing terminal 30.

【００１１】縮径部材４は、環状に形成された形状記憶
合金製のもので、変態状態で樹脂管５の外周面に固着す
るようになされている。この縮径部材４は、前記樹脂管
本体２に設けられた溝部２１内に配置され、電気融着継
手１の融着前の状態で、拡径状態に塑性変形させられて
、嵌合部２０に挿入される樹脂管５に当たらないように
なされている。この縮径部材４の具体的な形状としては
、予め環状となされたものに限らず、変態状態で環状と
なるように線材を環状に形成したものであってもよい。 また、その断面形状としても、特に限定されるものでは
なく、各種形状のものを用いることができる。中でも、
図２（ａ）〜（ｄ）に示すように、樹脂管５との固着面
側に係止部４１が設けられたものを用いることが好まし
い。この場合、変態状態で、係止部４１が樹脂管５の外
周面にしっかりと固着することとなる。また、この縮径
部材４としては、融着温度である摂氏２００度付近に変
態温度を設定したものを使用することが好ましい。 例えば、Ｃｕ系形状記憶合金や、Ｎｉ−Ｔｉ系記憶合金
等が挙げられるが、コスト面からＣｕ系形状記憶合金を
用いるほうが好ましい。この縮径部材４は、金属粉末に
よる射出成形で種々の形状に成形加工することができる
。The diameter reducing member 4 is formed into an annular shape and is made of a shape memory alloy, and is fixed to the outer peripheral surface of the resin pipe 5 in a transformed state. This diameter-reducing member 4 is disposed in a groove 21 provided in the resin pipe main body 2, and is plastically deformed to an enlarged diameter state before the electric fusion joint 1 is fused, so that the fitting portion 20 This is done so that it does not hit the resin tube 5 inserted into the tube. The specific shape of this diameter-reducing member 4 is not limited to an annular shape in advance, but may be a wire formed into an annular shape so that it becomes annular in a transformed state. Further, its cross-sectional shape is not particularly limited, and various shapes can be used. Among them,
As shown in FIGS. 2(a) to 2(d), it is preferable to use one in which a locking portion 41 is provided on the side to which the resin tube 5 is fixed. In this case, the locking portion 41 will firmly adhere to the outer circumferential surface of the resin tube 5 in the transformed state. Further, it is preferable to use a diameter reducing member 4 whose transformation temperature is set around 200 degrees Celsius, which is the fusion temperature. For example, Cu-based shape memory alloys, Ni-Ti-based memory alloys, etc. may be used, but it is preferable to use Cu-based shape memory alloys from the viewpoint of cost. This diameter reducing member 4 can be molded into various shapes by injection molding using metal powder.

【００１２】なお、溝部２１の形成方法としては、図３
に示すような樹脂管本体２を使用することができる。す
なわち、この樹脂管本体２は、溝部２１に連続して段部
２３が形成されたもので、この段部２３にカラー２４を
嵌着することで溝部２１を封鎖するものである。そして
、このカラー２４と樹脂管本体２との嵌着は、ネジ等に
よる嵌合でもよく、また、高周波誘導加熱等による融着
固定でもよい。この樹脂管本体２の場合、あらかじめ拡
径した縮径部材４を溝部２１内に配置することができる
。Note that the method for forming the groove portion 21 is as shown in FIG.
A resin tube main body 2 as shown in can be used. That is, this resin tube main body 2 has a stepped portion 23 formed continuously with the groove portion 21, and the groove portion 21 is closed by fitting the collar 24 into the stepped portion 23. The collar 24 and the resin tube body 2 may be fitted together by screws or the like, or may be fused and fixed by high frequency induction heating or the like. In the case of this resin pipe main body 2, the diameter reducing member 4 whose diameter has been expanded in advance can be placed in the groove portion 21.

【００１３】このようになる電気融着継手１によると、
縮径部材４が樹脂管５の外周面に固着することとなるの
で、万が一融着不良が生じたような場合であっても、電
気融着継手１から樹脂管５が抜けるといった最悪の状態
を回避し、漏水程度に抑えることができる。また、この
縮径部材４によって最初の固定位置が維持されるので、
再度電流を流して融着作業を行うことができる。According to the electric fusion joint 1 as described above,
Since the diameter reducing member 4 is fixed to the outer circumferential surface of the resin pipe 5, even in the unlikely event that a fusion failure occurs, the worst situation such as the resin pipe 5 coming off from the electric fusion joint 1 can be avoided. This can be avoided and reduced to a level of water leakage. In addition, since the initial fixed position is maintained by this diameter reducing member 4,
The current can be applied again to perform the fusing operation.

【００１４】[0014]

【発明の効果】以上述べたように、本発明によると、縮
径部材が、融着状態の是非に関わらず、溝部内に設けら
れた状態で、樹脂管の外周面に固着することとなるので
、融着不良が発生したような場合であっても、電気融着
継手から樹脂管が抜けるのを防止し、漏水程度に食い止
めることができる。また、この縮径部材によって最初の
固定位置が維持されるので、再度電流を流して融着作業
を行うことができる。[Effects of the Invention] As described above, according to the present invention, the diameter reducing member is fixed to the outer circumferential surface of the resin pipe while provided in the groove, regardless of whether or not it is fused. Therefore, even if a fusion failure occurs, the resin pipe can be prevented from coming off from the electric fusion joint, and water leakage can be prevented. Further, since the initial fixing position is maintained by this diameter reducing member, the welding operation can be performed by applying current again.

【図面の簡単な説明】[Brief explanation of the drawing]

【図１】本発明に係る電気融着継手の全体構成の概略を
示す部分破断側面図である。FIG. 1 is a partially cutaway side view schematically showing the overall configuration of an electric fusion joint according to the present invention.

【図２】縮径部材の各種形状を示す端面図である。FIG. 2 is an end view showing various shapes of the diameter reducing member.

【図３】電気融着継手の他の実施例を示す部分断面図で
ある。FIG. 3 is a partial cross-sectional view showing another embodiment of an electrofusion joint.

【図４】従来の電気融着継手を示す部分破断側面図であ
る。FIG. 4 is a partially cutaway side view showing a conventional electrofusion joint.

【符号の説明】[Explanation of symbols]

１　　電気融着継手 ２　　樹脂管本体 ２１　　溝部 ３　　コイル ４　　縮径部材 1 Electric fusion joint 2 Resin pipe body 21 Groove 3 Coil 4 Diameter reducing member

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】　　樹脂管本体に、通電によって発熱する
コイルが埋設されてなる電気融着継手であって、樹脂管
本体の内周面に溝部が周設され、該溝部内に、電気融着
時の熱によって縮径する形状記憶合金製の縮径部材が設
けられたことを特徴とする電気融着継手。1. An electric fusion joint in which a coil that generates heat when energized is embedded in a resin pipe body, wherein a groove is provided on the inner circumferential surface of the resin pipe body, and the electric fusion joint is formed in the groove. An electric fusion joint characterized by being provided with a diameter-reducing member made of a shape-memory alloy whose diameter is reduced by the heat of time.
JP3020773A 1991-02-14 1991-02-14 Electric fusion joint Pending JPH04258594A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3020773A JPH04258594A (en) 1991-02-14 1991-02-14 Electric fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3020773A JPH04258594A (en) 1991-02-14 1991-02-14 Electric fusion joint

Publications (1)

Publication Number Publication Date
JPH04258594A true JPH04258594A (en) 1992-09-14

Family

ID=12036483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3020773A Pending JPH04258594A (en) 1991-02-14 1991-02-14 Electric fusion joint

Country Status (1)

Country Link
JP (1) JPH04258594A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1190839A1 (en) * 2000-09-21 2002-03-27 Georg Fischer Wavin AG Synthetic welding elements
US6375226B1 (en) * 1996-11-20 2002-04-23 Uponor Innovation Ab Pipe connector having mechanical and fusion connections

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04171392A (en) * 1990-11-02 1992-06-18 Osaka Gas Co Ltd Electrically fused pipe joint

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04171392A (en) * 1990-11-02 1992-06-18 Osaka Gas Co Ltd Electrically fused pipe joint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6375226B1 (en) * 1996-11-20 2002-04-23 Uponor Innovation Ab Pipe connector having mechanical and fusion connections
EP1190839A1 (en) * 2000-09-21 2002-03-27 Georg Fischer Wavin AG Synthetic welding elements

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