JPH0942569A - Electro fusion coupling - Google Patents

Electro fusion coupling

Info

Publication number
JPH0942569A
JPH0942569A JP7190004A JP19000495A JPH0942569A JP H0942569 A JPH0942569 A JP H0942569A JP 7190004 A JP7190004 A JP 7190004A JP 19000495 A JP19000495 A JP 19000495A JP H0942569 A JPH0942569 A JP H0942569A
Authority
JP
Japan
Prior art keywords
diameter
joint
depression
projection
recess
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.)
Granted
Application number
JP7190004A
Other languages
Japanese (ja)
Other versions
JP3240885B2 (en
Inventor
Hidekazu Tsuruta
秀和 鶴田
Ryoji Saito
良次 斉藤
Kenichi Toyama
健一 遠山
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP19000495A priority Critical patent/JP3240885B2/en
Publication of JPH0942569A publication Critical patent/JPH0942569A/en
Application granted granted Critical
Publication of JP3240885B2 publication Critical patent/JP3240885B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/976—Checking completion of joining or correct joining by using indications on at least one of the joined parts by the use of an indicator pin, e.g. being integral with one of the parts to be joined
    • 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
    • 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
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Abstract

PROBLEM TO BE SOLVED: To prevent fusing from being defective, and also visually confirm that fusing has been over by forming a small depressing the opening diameter of which is smaller than the diameter of a bottom part in the outer surface of an electro fusion coupling, and integrally forming projection the lower part diameter of which is larger than the opening diameter of the depression, in the inside of the depression. SOLUTION: A depression 2 is formed in such a way as to be normal to a pipe axis of an electro fusion coupling 1. An opening diameter of the depression 2 is set to be smaller than the diameter of a bottom part. A projection 3 with specified height is integrally formed in the inside of the depression 2. A head part of the projection 3 is made smaller in diameter than the opening, and the diameter on the bottom side at a place with specified height in the height direction of the projection 3, is set to be larger than the opening diameter of the depression 2. The projection 3 is pushed out to the outer surface of the coupling 1 so as to be projected out by the expansion of molten resin at the time of fusing. However, since the bottom of the projection 3 is larger in diameter than the opening diameter of the depression 2, projecting motion is suspended after the specified quantity has been projected. Outflow of molten resin is thereby suspended so as to be sustained by internal pressure. And concurrently, it is visually confirmed by the aforesaid projection that fusing has been over.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、ポリオレフィンな
どの熱可塑性樹脂からなる樹脂管を接合するための電気
融着継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion joint for joining resin tubes made of a thermoplastic resin such as polyolefin.

【０００２】[0002]

【従来の技術】電気融着継手は、熱可塑性樹脂からなる
継手本体の内周部に配設された電熱線に通電することに
より、継手本体の内周部と継手に挿入された熱可塑性樹
脂管の外周部を融着して、樹脂管同士の接合を図るもの
である。2. Description of the Related Art An electric fusion joint is a thermoplastic resin which is inserted into the inner peripheral portion of the joint body and the joint by energizing a heating wire provided in the inner peripheral portion of the joint body made of thermoplastic resin. The outer peripheral portions of the pipes are fused and the resin pipes are joined together.

【０００３】実際に施工するときは、配管などに必要な
接合すべき樹脂管は、まとめて電気融着継手に挿入され
た後、まとめて電気融着されて、配設されるのが一般的
である。このとき、接合すべき樹脂管と電気融着継手が
既に電気融着されたものかどうかは外観上判定できない
ため、配設前に、人が引っ張ってチェックしている。In actual construction, resin pipes to be joined, which are necessary for pipes, etc., are generally inserted into an electric fusion joint and then electrofused together to be disposed. Is. At this time, it is not possible to visually judge whether or not the resin pipe to be joined and the electric fusion joint have already been electrically fused, and therefore, a person pulls and checks them before installation.

【０００４】このチェックは非常に煩わしい作業なた
め、外観上それが融着済かどうかを判定できれば、その
メリットは大きい。Since this check is a very troublesome work, if it can be judged from the appearance whether or not it has been fused, its merit is great.

【０００５】これまで、融着済かどうかを目視で確認で
きる表示手段を備えた電気融着継手がいくつか提案され
ている。例えば、特開昭６１ー６２６９６号公報には、
継手の外表面に、その底部が融着領域に位置するような
円筒状の窪みを形成し、その中に別途ピンを挿入した電
気融着継手が紹介されている。これは、融着時に溶融樹
脂の膨張とともに、このピンが継手外表面へ突出するこ
とを利用し、目視により融着済かどうかを確認しようと
いうものである。Up to now, there have been proposed some electric fusion joints having a display means capable of visually confirming whether or not fusion has been completed. For example, in Japanese Patent Laid-Open No. 61-62696,
An electric fusion-bonding joint has been introduced in which a cylindrical recess is formed on the outer surface of the joint so that its bottom is located in the fusion-bonding region, and a pin is inserted into the hollow. This is to confirm whether or not the fusion has been completed visually by utilizing the fact that this pin projects to the outer surface of the joint as the molten resin expands during fusion.

【０００６】この他、図４〜６に示すような電気融着継
手も提案されている。図４〜６で、１は継手、２は窪
み、３は突起、４は電熱線、５はストッパーを表す。以
下の図においても、同じ番号は同じものを表す。In addition, electric fusion joints as shown in FIGS. 4 to 6 have also been proposed. 4 to 6, 1 is a joint, 2 is a depression, 3 is a protrusion, 4 is a heating wire, and 5 is a stopper. In the following figures, the same numbers represent the same things.

【０００７】図４は、継手１の外表面に窪み２のみを設
けた電気融着継手、図５は、窪み２の底部に突起３を設
けた電気融着継手、図６は、突起３を設けた窪み２の開
口部に、別途ストッパー５を設けた電気融着継手であ
り、融着時の樹脂の膨張による窪み２からの樹脂や突起
３の突出を目視にて確認し、融着済かどうかを判定して
いる。[0007] FIG. 4 is an electrofusion joint in which only the recess 2 is provided on the outer surface of the joint 1, FIG. 5 is an electrofusion joint in which the protrusion 3 is provided at the bottom of the recess 2, and FIG. It is an electric fusion joint in which a stopper 5 is additionally provided at the opening of the provided recess 2, and the protrusion of the resin and the protrusion 3 from the recess 2 due to the expansion of the resin at the time of fusion is visually confirmed and the fusion is completed. It is determined whether or not.

【０００８】[0008]

【発明が解決しようとする課題】しかしながら、特開昭
６１ー６２６９６号公報に記載の電気融着継手や図６に
示す電気融着継手では、ピンやストッパー５を窪み２の
開口部に別途設ける必要があり、製造工程が複雑にな
り、コスト的にも不利となる。また、図４や図５示す電
気融着継手では、窪み２が開放されてるため、あるいは
窪み２の底部の突起３の隆起を制限するストッパー５が
ないため、溶融した樹脂が窪みから無制限に溢れだした
り、溶融した樹脂によって生じる継手と樹脂管の融着界
面の圧力いわゆる内圧が低下して融着不良を引き起こす
場合がある。特に、高温で流動性の増すポリオレフィン
系樹脂であるポリブテンを用いると、こうした傾向が増
大する。However, in the electric fusion joint described in Japanese Patent Laid-Open No. 61-62696 and the electric fusion joint shown in FIG. 6, a pin or a stopper 5 is separately provided in the opening of the recess 2. However, the manufacturing process is complicated and the cost is disadvantageous. In addition, in the electric fusion splicing joint shown in FIGS. 4 and 5, since the recess 2 is opened, or because there is no stopper 5 that restricts the protrusion of the protrusion 3 at the bottom of the recess 2, the molten resin overflows from the recess indefinitely. In some cases, the pressure at the fusion interface between the joint and the resin pipe, which is caused by the molten resin, so-called internal pressure is lowered to cause defective fusion. In particular, the use of polybutene, which is a polyolefin resin whose fluidity increases at high temperatures, increases this tendency.

【０００９】本発明は、このような問題を解決するため
になされたもので、融着不良が起こらず、目視により融
着済を確実に確認できる表示手段を備えた電気融着継手
を提供することを目的とする。The present invention has been made in order to solve such a problem, and provides an electric fusion joint having a display means capable of surely confirming fusion completion by visual observation without causing a fusion defect. The purpose is to

【００１０】[0010]

【課題を解決するための手段】本発明者らは、融着不良
が起こらず、目視により融着済を確実に確認できる表示
手段を備えた電気融着継手の構造について鋭意検討した
結果、継手外表面に、その底部に突起を有する窪みを設
け、融着時にその突起が継手外表面に突出するととも
に、窪みに引っ掛かるような構造とすれば、上記課題が
解決されることを見出した。Means for Solving the Problems The inventors of the present invention have diligently studied a structure of an electric fusion joint having a display means capable of surely confirming fusion completion by visual observation without causing a fusion defect, and as a result, It has been found that the above problem can be solved by providing a recess having a projection on the bottom of the outer surface thereof, and the projection protruding to the outer surface of the joint at the time of fusion bonding and being caught in the recess.

【００１１】すなわち、請求項１に記載の第１の発明
は、以下の構造を有することを特徴とする電気融着継手
である。That is, the first invention according to claim 1 is an electric fusion joint having the following structure.

【００１２】（Ａ）その外表面に１個以上の窪みを有す
る電気融着継手であって、前記窪みの深さ方向が前記電
気融着継手の軸直角方向に平行で、かつ前記窪みの底部
が前記電気融着継手の融着領域内に位置する。(A) An electrofusion joint having one or more recesses on its outer surface, wherein the depth direction of the recess is parallel to the direction perpendicular to the axis of the electrofusion joint, and the bottom of the recess is Are located within the fusion zone of the electrofusion joint.

【００１３】（Ｂ）前記窪みの前記電気融着継手外表面
における開口径が前記窪みの底部の径より小さい。(B) The opening diameter of the recess on the outer surface of the electric fusion joint is smaller than the diameter of the bottom of the recess.

【００１４】（Ｃ）前記窪み中には、所定の高さの突起
が設けられている。(C) A protrusion having a predetermined height is provided in the recess.

【００１５】（Ｄ）前記突起の頭部の径が前記窪みの開
口径より小さく、しかも前記突起の高さ方向の所定の位
置から底部側の部位における径が前記窪みの開口径より
大きい。(D) The diameter of the head of the projection is smaller than the opening diameter of the depression, and the diameter of the projection at a portion on the bottom side from a predetermined position in the height direction is larger than the opening diameter of the depression.

【００１６】（Ｅ）前記窪みと前記突起は一体成形され
ている。(E) The recess and the protrusion are integrally formed.

【００１７】融着時、窪みの底部およびその近傍の樹脂
が溶融する。溶融した樹脂は膨張し、継手と接合樹脂管
の界面に沿って、あるいは窪みの開口部に向かって流動
する。このとき、突起は、その頭部および頭部近傍の径
が窪みの開口径より小さいので、流動樹脂に押され継手
外表面から突出する。しかし、突起の突出は、突起の底
部およびその近傍の径が窪みの開口部の径より大きいた
め、突起の底部およびその近傍が窪みの内壁にあたり、
突起の頭部が継手外表面からある高さに達したところで
止まる。このため、溶融した樹脂が窪みから無制限に溢
れだすこともなく、また、内圧も確保されるので、融着
不良を起こさずに融着済の判定が目視により可能とな
る。At the time of fusion bonding, the resin at the bottom of the recess and its vicinity melts. The molten resin expands and flows along the interface between the joint and the joined resin pipe or toward the opening of the depression. At this time, since the diameter of the protrusion and the diameter in the vicinity of the head are smaller than the opening diameter of the depression, the protrusion is pushed by the fluid resin and protrudes from the outer surface of the joint. However, since the diameter of the bottom of the protrusion and the vicinity thereof is larger than the diameter of the opening of the recess, the bottom of the protrusion and the vicinity thereof contact the inner wall of the recess.
It stops when the head of the protrusion reaches a certain height from the outer surface of the joint. For this reason, the melted resin does not overflow from the depressions indefinitely, and the internal pressure is secured, so that it is possible to visually judge the fusion completion without causing the fusion failure.

【００１８】また、窪みと突起は一体成形されているた
め射出成形を適用でき、製造工程が簡略化され、コスト
的にも有利となる。Further, since the depression and the projection are integrally molded, injection molding can be applied, the manufacturing process is simplified, and it is advantageous in terms of cost.

【００１９】窪みの大きさ（深さ、径）や突起の大きさ
（高さ、径）は、使用する樹脂、電気融着継手の形状や
大きさ、融着時の通電条件などにより樹脂流動の挙動が
異なるので、予め各々の場合に最適な値を求めておく必
要がある。The size (depth, diameter) of the depressions and the size (height, diameter) of the protrusions depend on the resin used, the shape and size of the electric fusion joint, and the current flow conditions during fusion. Since the behavior of is different, it is necessary to obtain the optimum value in each case in advance.

【００２０】なお、突起の底部およびその近傍の径は、
突起が適当な高さで完全に止まるように、窪みの開口部
の径の１．１倍以上であることが好ましい。The diameter of the bottom of the protrusion and its vicinity are
The diameter is preferably 1.1 times or more the diameter of the opening of the depression so that the protrusion completely stops at an appropriate height.

【００２１】請求項２に記載の第２の発明は、第１の発
明である電気融着継手の窪み周辺部の肉厚を、他の部分
より厚くした電気融着継手に関するものである。A second invention according to claim 2 relates to an electric fusion joint in which the wall thickness of the peripheral portion of the recess of the electric fusion joint of the first invention is made thicker than other portions.

【００２２】継手の肉厚が薄く、窪みの深さや突起の高
さを十分に確保できない場合は、窪み周辺部の肉厚を厚
くすることにより、それが可能となる。When the thickness of the joint is thin and the depth of the recess and the height of the protrusion cannot be sufficiently secured, it is possible to increase the thickness of the peripheral portion of the recess.

【００２３】[0023]

【発明の実施の形態】図１のａに、本発明の１実施例で
ある電気融着継手の管軸に垂直な方向から見た窪み近傍
の断面図を示す。図で、１は継手、２は窪み、３は突
起、４は電熱線である。なお、図１のｂは融着後の状態
を示す図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows a sectional view of the vicinity of a recess seen from a direction perpendicular to a pipe axis of an electric fusion joint according to an embodiment of the present invention. In the figure, 1 is a joint, 2 is a depression, 3 is a protrusion, and 4 is a heating wire. In addition, b of FIG. 1 is a diagram showing a state after fusion bonding.

【００２４】電熱線４に電流を流すと、電熱線４の近傍
の樹脂は溶融する。窪み２の底部は融着領域に位置する
よう設けられているので、その底部の樹脂も溶融する。
溶融した樹脂は膨張するため、開放されている方向、す
なわち継手１の管軸に平行あるいは直角方向へ流動す
る。継手１の管軸に直角方向へ流動した樹脂は、突起３
を押上げ、図１のｂに示すように、突起３の底部が窪み
２の内壁にあたるまで突起３は継手１の外表面に突出す
る。このため、溶融した樹脂が窪み２から無制限に溢れ
だすこともなく、また、内圧も確保されるので、融着不
良を起こさずに融着済の判定が目視により可能となる。When a current is applied to the heating wire 4, the resin near the heating wire 4 melts. Since the bottom of the depression 2 is provided so as to be located in the fusion-bonded region, the resin on the bottom also melts.
Since the molten resin expands, it flows in the open direction, that is, in the direction parallel or perpendicular to the pipe axis of the joint 1. The resin that has flowed in the direction perpendicular to the pipe axis of the joint 1
1 is pushed up, the protrusion 3 projects to the outer surface of the joint 1 until the bottom of the protrusion 3 hits the inner wall of the recess 2 as shown in FIG. For this reason, the melted resin does not overflow from the dent 2 indefinitely, and the internal pressure is secured, so that the fusion completion can be visually determined without causing the fusion failure.

【００２５】図２に、本発明の別の１実施例である電気
融着継手の管軸に垂直な方向から見た窪み近傍の断面図
を示す。本継手１においては、窪み２の近傍の肉厚がそ
れ以外のところより厚くなっている。これにより、継手
１の肉厚が薄い場合でも、窪み２の深さや突起３の高さ
を十分に確保できるようになる。FIG. 2 is a cross-sectional view of the vicinity of the recess as seen from the direction perpendicular to the tube axis of the electric fusion joint which is another embodiment of the present invention. In the present joint 1, the thickness in the vicinity of the depression 2 is thicker than the other portions. As a result, even if the joint 1 is thin, the depth of the recess 2 and the height of the protrusion 3 can be sufficiently secured.

【００２６】図３に、本発明のさらに別のいくつかの実
施例である電気融着継手の管軸に垂直な方向から見た窪
み近傍の断面図を示す。図のような構造の継手であって
も、本発明の効果は発揮される。FIG. 3 is a cross-sectional view of the vicinity of the recess seen from the direction perpendicular to the tube axis of the electric fusion joint which is another embodiment of the present invention. The effect of the present invention is exhibited even with a joint having a structure as shown in the figure.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の１実施例である電気融着継手の管軸に
垂直な方向から見た窪み近傍の断面図である。FIG. 1 is a cross-sectional view of the vicinity of a recess seen from a direction perpendicular to a pipe axis of an electric fusion joint which is an embodiment of the present invention.

【図２】本発明の別の１実施例である電気融着継手の管
軸に平行な方向から見た窪み近傍の断面図である。FIG. 2 is a cross-sectional view of a vicinity of a recess as seen from a direction parallel to a pipe axis of an electric fusion joint which is another embodiment of the present invention.

【図３】本発明のさらに別のいくつかの実施例である電
気融着継手の管軸に垂直な方向から見た窪み近傍の断面
図である。FIG. 3 is a cross-sectional view of the vicinity of a recess as seen from a direction perpendicular to a pipe axis of an electric fusion joint which is still another embodiment of the present invention.

【図４】従来の電気融着継手の管軸に垂直な方向から見
た融着済判定用表示手段近傍の断面図である。FIG. 4 is a cross-sectional view of the vicinity of the fusion-determined display means as seen from the direction perpendicular to the tube axis of the conventional electric fusion joint.

【図５】従来の別の電気融着継手の管軸に垂直な方向か
ら見た融着済判定用表示手段近傍の断面図である。FIG. 5 is a cross-sectional view in the vicinity of the fusion-determined display means viewed from a direction perpendicular to the tube axis of another conventional electric fusion joint.

【図６】従来のさらに別の電気融着継手の管軸に垂直な
方向から見た融着済判定用表示手段近傍の断面図であ
る。FIG. 6 is a cross-sectional view of the vicinity of the fusion-determined display means as seen from the direction perpendicular to the tube axis of another conventional electric fusion joint.

【符号の説明】[Explanation of symbols]

１ 継手 ２ 窪み ３ 突起 ４ 電熱線 1 Joint 2 Dimple 3 Protrusion 4 Heating wire

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 以下の構造を有することを特徴とする電
気融着継手。 （Ａ）その外表面に１個以上の窪みを有する電気融着継
手であって、前記窪みの深さ方向が前記電気融着継手の
軸直角方向に平行で、かつ前記窪みの底部が前記電気融
着継手の融着領域内に位置する。 （Ｂ）前記窪みの前記電気融着継手外表面における開口
径が前記窪みの底部の径より小さい。 （Ｃ）前記窪みの底部には、所定の高さの突起が設けら
れている。 （Ｄ）前記突起の頭部の径が前記窪みの開口径より小さ
く、しかも前記突起の高さ方向の所定の位置から底部側
の部位における径が前記窪みの開口径より大きい。 （Ｅ）前記窪みと前記突起は一体成形されている。1. An electric fusion splicing joint having the following structure. (A) An electric fusion joint having one or more dents on its outer surface, wherein the depth direction of the dents is parallel to a direction perpendicular to the axis of the electric fusion joint, and the bottom of the dent is the electric Located within the fusion area of the fusion joint. (B) The opening diameter of the recess on the outer surface of the electric fusion joint is smaller than the diameter of the bottom of the recess. (C) A protrusion having a predetermined height is provided on the bottom of the recess. (D) The diameter of the head of the projection is smaller than the opening diameter of the depression, and the diameter of the projection on the bottom side from a predetermined position in the height direction is larger than the opening diameter of the depression. (E) The recess and the protrusion are integrally formed. 【請求項２】 前記窪みの周辺部の肉厚が、それ以外の
部分の肉厚より厚いことを特徴とする請求項１に記載の
電気融着継手。2. The electric fusion splicing joint according to claim 1, wherein the thickness of the peripheral portion of the recess is thicker than the thickness of other portions.
JP19000495A 1995-07-26 1995-07-26 Electric fusion joint Expired - Fee Related JP3240885B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19000495A JP3240885B2 (en) 1995-07-26 1995-07-26 Electric fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19000495A JP3240885B2 (en) 1995-07-26 1995-07-26 Electric fusion joint

Publications (2)

Publication Number Publication Date
JPH0942569A true JPH0942569A (en) 1997-02-14
JP3240885B2 JP3240885B2 (en) 2001-12-25

Family

ID=16250785

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19000495A Expired - Fee Related JP3240885B2 (en) 1995-07-26 1995-07-26 Electric fusion joint

Country Status (1)

Country Link
JP (1) JP3240885B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310372A (en) * 2001-04-10 2002-10-23 Sekisui Chem Co Ltd Electric fusion joint having indicator
JP2012202492A (en) * 2011-03-25 2012-10-22 Sekisui Chem Co Ltd Method for manufacturing electric fusion joint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310372A (en) * 2001-04-10 2002-10-23 Sekisui Chem Co Ltd Electric fusion joint having indicator
JP2012202492A (en) * 2011-03-25 2012-10-22 Sekisui Chem Co Ltd Method for manufacturing electric fusion joint

Also Published As

Publication number Publication date
JP3240885B2 (en) 2001-12-25

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