JPH062795A - Electric heat fused coupling made of plastic and manufacture thereof - Google Patents

Electric heat fused coupling made of plastic and manufacture thereof

Info

Publication number
JPH062795A
JPH062795A JP4158210A JP15821092A JPH062795A JP H062795 A JPH062795 A JP H062795A JP 4158210 A JP4158210 A JP 4158210A JP 15821092 A JP15821092 A JP 15821092A JP H062795 A JPH062795 A JP H062795A
Authority
JP
Japan
Prior art keywords
joint
core
wire
metal wire
diameter
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
JP4158210A
Other languages
Japanese (ja)
Other versions
JP3203770B2 (en
Inventor
Toru Uenishi
徹 上西
Kazuhiro Horie
和弘 堀江
Kenji Shiozaki
憲司 塩崎
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.)
TOKUSHU KOGYO KK
Nippon Steel Corp
Original Assignee
TOKUSHU KOGYO KK
Sumitomo Metal Industries 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 TOKUSHU KOGYO KK, Sumitomo Metal Industries Ltd filed Critical TOKUSHU KOGYO KK
Priority to JP15821092A priority Critical patent/JP3203770B2/en
Publication of JPH062795A publication Critical patent/JPH062795A/en
Application granted granted Critical
Publication of JP3203770B2 publication Critical patent/JP3203770B2/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
    • B29C65/3432—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 comprising several wires, e.g. in the form of several independent 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"
    • B29C65/3468—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
    • 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
    • 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
    • B29C65/348—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 with a polymer coating
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To improve the reliability and workability of connection by allowing a metal wire at each joint part of an electrical heat fused coupling made of plastic which is formed by embedding the heating metal wire into an inner peripheral part not to be connected with the metal wire at other joint port and to be fused at each joint port. CONSTITUTION:After two jointed pipes 7 are inserted inside a coupling from the coupling ports A and A' on both the sides of a coupling 1, a connector 6 at the top edge of the lead wire of the coupling 1 is connected at the connection part of a controller as electric power source, and a prescribed electric current is supplied to a metal wire 3. The resin in the vicinity of the interface between the coupling 1 and the jointed pipe 7 is molten by the generated heat on the metal wire 3, and the coupling 1 and the jointed pipe 7 are fused. Since the joint ports A and A' form each independent electrical heating circuit, all the joint ports can be formed to an electrical heat fused coupling made of plastic, even if the coupling 1 is a multiport coupling. Further, since each joint port is fused with the jointed pipe 7 by separately putting each joint port into electric conduction, work is facilitated even if the coupling 1 has a complicate shape or in the situation where work is difficult.

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、プラスチック製電熱融
着継手(electric fusion joint、以下ＥＦ継手と略記す
る) の構造とその製造方法に関する。より詳しくは、本
発明は、口毎に電熱融着が可能な、特に大口径パイプの
接続や多口数の継手に適した、作業性に優れたＥＦ継手
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plastic electric fusion joint (hereinafter abbreviated as EF joint) and a manufacturing method thereof. More specifically, the present invention relates to an EF joint that is capable of electrothermal fusion bonding for each port and is particularly suitable for connection of large-diameter pipes and joints with a large number of ports and has excellent workability.

【０００２】[0002]

【従来の技術】プラスチックパイプの接続法には多様な
方法があるが、機械的継手方式、熱融着方式、接着剤方
式が主流である。機械的継手方式とは、金物継手を用い
た接続法で、施工は簡単であるが、若干信頼性に欠け
る。熱融着方式は、継手もパイプと同様にプラスチック
製で、接着面（継手の内面とパイプの外面) をヒーター
等で接合前に溶融しておき、融着する方法である。この
方式は信頼性が高いが、融着機が大きくて施工が困難で
熟練を要する上に、仕上がりに個人差が大きい等の欠点
がある。接着剤方式は接着剤で接続する方法であるが、
施工に個人差が大きく、無極性で接着剤に濡れにくいオ
レフィン系樹脂を使用したパイプには使用できないとい
う問題点がある。2. Description of the Related Art There are various methods for connecting plastic pipes, but a mechanical joint method, a heat fusion method, and an adhesive method are the mainstream. The mechanical joint method is a connection method using a metal joint, and although the construction is simple, it is somewhat unreliable. The heat fusion method is a method in which the joint is made of plastic as in the case of the pipe, and the bonding surface (the inner surface of the joint and the outer surface of the pipe) is melted with a heater or the like before joining and then fused. Although this method is highly reliable, it has drawbacks such as a large fusion machine, difficult construction, skill, and large individual differences in finish. The adhesive method is a method of connecting with an adhesive,
There is a big difference in construction, and there is a problem that it cannot be used for pipes made of olefin resin that is non-polar and does not easily get wet with the adhesive.

【０００３】これらの欠点を補う継手が電熱融着方式の
継手、即ち、ＥＦ継手である。ＥＦ継手は、加熱用金属
線 (ワイヤー) を継手の内面にコイル状に周回させて埋
め込んだ構造の継手であり、ワイヤーをコアにコイル状
に巻き付けて金型に装着し、射出成形機を用いてインサ
ート成形することにより製造することができる。ＥＦ継
手では、継手にパイプを差し込んだ後、電源からの電気
量を制御するコントローラーにワイヤーを接続して継手
内面のコイルに通電することによって発熱させ、継手と
パイプの接合面を溶かすことにより、接着が行われる。A joint that compensates for these drawbacks is an electrothermal fusion type joint, that is, an EF joint. The EF joint is a joint having a structure in which a heating metal wire (wire) is embedded in the inner surface of the joint by winding it in a coil shape. The wire is wound around a core in a coil shape and mounted in a mold, and an injection molding machine is used. It can be manufactured by insert molding. In the EF joint, after inserting the pipe into the joint, by connecting a wire to the controller that controls the amount of electricity from the power source and energizing the coil inside the joint to generate heat, the joint surface of the joint and the pipe is melted, Bonding is done.

【０００４】従来のＥＦ継手のコントローラーとの接続
方式としては、継手本体にプラグとなるピンを立て、そ
のピンにコントローラーのコンセントを接続させて通電
させるか、または継手からリード線を出し、コントロー
ラーとの接続部にリード線をクリップ等で挟むことによ
って接続する方式が採用されていた。As a conventional connection method of the EF joint with the controller, a pin serving as a plug is erected on the joint body and an outlet of the controller is connected to the pin to energize, or a lead wire is taken out from the joint to connect with the controller. The method of connecting by connecting the lead wire with a clip or the like at the connection portion of was adopted.

【０００５】[0005]

【発明が解決しようとする課題】従来のＥＦ継手では、
１つの継手について各継手口の融着を一度で行うため、
３口以上の多口数の継手は全継手口をＥＦ継手化するこ
とができなかった。また、大口径パイプは大きくて重い
ため、従来のＥＦ継手で継手口を一度に接続するのは大
変であるという問題もあった。In the conventional EF joint,
Since fusion of each joint port is performed at once for one joint,
In the case of a large number of joints of 3 or more, all joints could not be EF jointed. Further, since a large-diameter pipe is large and heavy, it is difficult to connect the joint ports with the conventional EF joint at one time.

【０００６】接続方式に関しては、継手にピンを立てる
方式は、コントローラーとの接続が狭所では困難で、ま
た通電直後にコンセントを抜くと継手内部のプラスチッ
クがまだ溶融状態にあるため、内部のコイル状の金属線
が固定されないまま抜けてしまう場合があったので、通
電後速やかに次の作業に移ることができなかった。一
方、コントローラーの接続部にリード線をクリップで挟
む方式では、クリップとリード線間の接触抵抗が一定に
ならないので、常に同一通電条件でパイプを融着するこ
とができず、融着の信頼性が低下していた。Regarding the connection method, the method in which a pin is set up on the joint is difficult to connect with the controller in a narrow place, and if the outlet is unplugged immediately after the power is turned on, the plastic inside the joint is still in a molten state. There was a case where the metal wire of the shape was removed without being fixed, so that it was not possible to immediately proceed to the next work after energization. On the other hand, in the method of sandwiching the lead wire with the clip at the connection part of the controller, the contact resistance between the clip and the lead wire is not constant, so the pipe cannot always be fused under the same energization condition, and the reliability of fusion Was falling.

【０００７】本発明の目的は、各継手口毎に別個に電熱
融着が可能で、接続の信頼性が高く、しかも狭所や大口
径パイプでも容易に施工でき、短時間でパイプの接続が
完了する作業性に優れたＥＦ継手を提供することであ
る。The object of the present invention is that the electrothermal fusion can be carried out separately for each joint port, the reliability of the connection is high, and the pipe can be easily connected even in a narrow space or a large diameter pipe, and the pipes can be connected in a short time. An object of the present invention is to provide an EF joint having excellent workability in completion.

【０００８】本発明の別の目的は、多数個取りの金型で
継手を円滑にインサート成形することが可能な、上記Ｅ
Ｆ継手の製造方法を提供することである。Another object of the present invention is to provide the above-mentioned E, which can smoothly insert-mold a joint with a multi-cavity mold.
An object of the present invention is to provide a method for manufacturing an F joint.

【０００９】[0009]

【課題を解決するための手段】本発明は、１つの継手の
各継手口ごとに電着融着が可能な構造のＥＦ継手の開発
により、上記問題点を解決するものである。即ち、本発
明は、次の〜を要旨とする。SUMMARY OF THE INVENTION The present invention solves the above problems by developing an EF joint having a structure capable of electrodeposition fusion at each joint port of one joint. That is, the present invention has the following gist.

【００１０】内周部に加熱用金属線を埋め込んだプラ
スチック製電熱融着継手であって、各継手口に埋め込ま
れた金属線が他の継手口に埋め込まれた金属線と接続し
ておらず、各継手口ごとに別々に融着作業することがで
きる、プラスチック製電熱融着継手。A plastic electrothermal fusion joint having a heating metal wire embedded in the inner periphery thereof, wherein the metal wire embedded in each joint opening is not connected to the metal wire embedded in another joint opening. , A plastic electrothermal fusion joint that can be fused separately for each joint port.

【００１１】各継手口から引出された断熱材で被覆さ
れた一対のリード線を備え、各対のリード線の先端にコ
ントローラー接続用コネクターが装着されている、の
電熱融着継手。An electrothermal fusion joint, comprising a pair of lead wires covered with a heat insulating material drawn out from each joint port, and a controller connection connector is attached to the tip of each pair of lead wires.

【００１２】金属線を巻付けたコアと金型とを用いた
インサート射出成形によりプラスチック製電熱融着継手
を製造する方法であって、コアと金型が、その各継手口
部分ごとに、端部側から順にリード線形成部、金属線引
出し部、および継手形成部を、コアと金型とで相応する
位置に備え；コアの外径は、継手形成部およびリード線
形成部が該継手口の内径相当の径、引出し部はほぼ継手
口内径相当のコアに該金属線を巻付けた時の径であり、
引出し部のコア面に、該金属線径と同じ幅および深さの
ワイヤー引出し用溝が２本設けられ；金型の内径は、継
手形成部が該継手口の外径相当の径、引出し部はコアの
引出し部の外径相当の径、リード線形成部は継手口内径
相当のコアに該金属線を巻付けた径に十分余裕をもって
離隔した径であり；コアの各継手口の継手形成部、引出
し部、およびリード線形成部に、継手口ごとに別の金属
線を巻き付けた後、金型内にコアを装着し、継手形成部
のコアと金型の間隙に樹脂を射出することを特徴とす
る、またはの電熱融着継手の製造方法。A method of manufacturing a plastic electrothermal fusion joint by insert injection molding using a core wound with a metal wire and a mold, wherein the core and the mold have ends at each joint mouth portion. A lead wire forming portion, a metal wire lead-out portion, and a joint forming portion at positions corresponding to the core and the mold in order from the side of the section; the outer diameter of the core is such that the joint forming portion and the lead wire forming portion have the joint opening. The diameter corresponding to the inner diameter of the, the drawing portion is the diameter when the metal wire is wound around the core corresponding to the inner diameter of the joint opening,
On the core surface of the drawing portion, two wire drawing grooves having the same width and depth as the metal wire diameter are provided; the inner diameter of the mold is such that the joint forming portion has a diameter corresponding to the outer diameter of the joint opening, and the drawing portion. Is a diameter corresponding to the outer diameter of the lead-out portion of the core, and the lead wire forming portion is a diameter separated from the diameter of the core corresponding to the inner diameter of the joint opening by winding the metal wire with a sufficient margin; After winding another metal wire for each joint opening around the joint, lead-out part, and lead wire forming part, mount the core in the mold and inject the resin into the gap between the core of the joint forming part and the mold. Or a method for manufacturing an electrothermal fusion joint.

【００１３】好適態様にあっては、金属線は、通電中の
ショートを確実に防止するため、ガラス繊維等の耐熱性
を有する絶縁繊維材料の編組体で被覆されている。ま
た、の巻き付けに用いる金属線は、さらに外周を継手
本体と同種の樹脂材料で被覆しておくことが好ましい。In a preferred embodiment, the metal wire is covered with a braid of insulating fiber material having heat resistance such as glass fiber in order to surely prevent a short circuit during energization. Moreover, it is preferable that the outer periphery of the metal wire used for winding is further coated with the same resin material as that of the joint body.

【００１４】[0014]

【作用】プラスチックパイプと継手の接続は、パイプの
径や継手の種類、施工場所の条件に関係なく容易に作業
できる必要がある。特に、大口径パイプは大きくて重い
ため、片口づつ融着できることが望ましく、さらに狭所
等の作業は困難で危険を伴うことが多いため、簡単に施
工できることが不可欠である。本発明によれば、電熱線
となる金属線を各継手口ごとに他と独立して（他の継手
口の金属線と接続させずに）配置し、好ましくは各継手
口のリード線を上記のように構成することにより、こ
れらの条件を満たすＥＦ継手が得られる。Operation: The connection between the plastic pipe and the joint must be easily workable regardless of the diameter of the pipe, the type of joint, and the conditions of the construction site. In particular, since a large-diameter pipe is large and heavy, it is desirable to be able to fuse the individual openings one by one. Further, since work in a narrow space is difficult and often involves danger, it is indispensable to be easily installed. According to the present invention, a metal wire to be a heating wire is arranged for each joint port independently of the other (without being connected to a metal wire of another joint port), and preferably the lead wire of each joint port is With such a configuration, an EF joint satisfying these conditions can be obtained.

【００１５】図１に、本発明のＥＦ継手の１例として、
直管タイプの継手を示す。本発明のＥＦ継手の形状は図
示のものに限定されない。即ち、各継手口ごとに電熱線
が独立しているという本発明の構造を持つ限り、ＥＦ継
手の形状および構造は変更することができる。例えば、
継手は曲管タイプの２口継手或いは分岐管タイプの３口
以上の多口継手であってもよい。本発明は特に３口以上
の多口継手や大口径継手に適している。FIG. 1 shows an example of the EF joint of the present invention.
A straight pipe type joint is shown. The shape of the EF joint of the present invention is not limited to that shown in the drawings. That is, the shape and structure of the EF joint can be changed as long as the heating wire has an independent heating wire for each joint opening. For example,
The joint may be a curved pipe type two-port joint or a branch pipe type three-port or more multi-port joint. The present invention is particularly suitable for a multi-port joint having three or more ports and a large-bore joint.

【００１６】図１(a) および(b) に示したＥＦ継手の継
手本体１は、樹脂製のスリーブ２とその内周部に埋め込
まれた加熱用金属線 (ワイヤー) ３とからなる。各継手
口Ａ, Ａ' のプラスチックパイプとの熱融着を行う部分
Ｂ，Ｂ’に金属線３を配置するが、各継手口の金属線は
他の継手口の金属線と接続せず、互いに独立させる。図
示例においては、図１(b) に示すように、各継手口
(例、継手口ａ) の内周面をその端部１ａ側から内側に
向かって融着部Ｂの長さだけ巻き付けられた金属線３
は、融着部Ｂの内側末端１ｂでターンして、再び外側に
向かって巻き付けられ、端部１ａに戻る。樹脂を均一に
溶融させるために、金属線を可及的に均一に巻き付け
る。金属線の巻きつけの間隔は、ショートの危険がない
程度で、かつ所望の樹脂の溶融加熱が短時間で可能とな
るように選定すればよい。The joint body 1 of the EF joint shown in FIGS. 1 (a) and 1 (b) comprises a resin sleeve 2 and a heating metal wire 3 embedded in the inner peripheral portion thereof. The metal wires 3 are arranged in the portions B and B ′ where the joint ports A and A ′ are heat-sealed with the plastic pipe, but the metal wires of each joint port are not connected to the metal wires of other joint ports, Make them independent of each other. In the illustrated example, as shown in Fig. 1 (b), each joint port
A metal wire 3 in which the inner peripheral surface of the joint port a is wound inward from the end 1a side for the length of the fused portion B
Turns at the inner end 1b of the fusion bond B, is again wound outward and returns to the end 1a. The metal wire is wound as evenly as possible in order to melt the resin uniformly. The winding intervals of the metal wires may be selected so that there is no risk of short circuit and the desired resin can be melted and heated in a short time.

【００１７】継手の材料は、従来のＥＦ継手と同様でよ
い。即ち、スリーブ２は、通常は被接合管であるプラス
チックパイプと同種の熱可塑性樹脂から構成する。例え
ば、ポリエチレン、ポリブテン等が例示される。金属線
３は、Ni、Cu、Cu−Ni、Ni−Crなどの効率よく抵抗加熱
可能な金属もしくは合金からなる。The material of the joint may be similar to conventional EF joints. That is, the sleeve 2 is made of the same kind of thermoplastic resin as the plastic pipe that is usually the pipe to be joined. For example, polyethylene, polybutene, etc. are exemplified. The metal wire 3 is made of a metal or alloy such as Ni, Cu, Cu-Ni, and Ni-Cr capable of efficiently performing resistance heating.

【００１８】この金属線３は、好ましくはガラス繊維等
の耐熱性の絶縁繊維材料を編組してなる被覆材で被覆し
ておく。それにより、融着不良の原因となる通電中の短
絡の発生を確実に防止することができる。この目的での
被覆は、比較的薄い被覆でよい。The metal wire 3 is preferably covered with a covering material formed by braiding a heat resistant insulating fiber material such as glass fiber. As a result, it is possible to reliably prevent the occurrence of a short circuit during energization, which causes defective fusion. The coating for this purpose may be a relatively thin coating.

【００１９】本発明の好適態様によれば、継手本体１の
各継手口において、その端部１ａから一対のリード線４
ａ、４ｂが引出されている。リード線４ａ、４ｂは金属
線３の両端の延長部分である。リード線４ａ、４ｂは、
各継手口の任意の位置から引出すことができるが、図示
のように継手口の端部から引出すのが製造上都合がよ
い。According to the preferred embodiment of the present invention, at each joint opening of the joint body 1, a pair of lead wires 4 is provided from the end 1a thereof.
a and 4b are pulled out. The lead wires 4 a and 4 b are extension parts of both ends of the metal wire 3. The lead wires 4a and 4b are
Although it is possible to pull out from any position of each joint port, it is convenient for manufacturing to pull out from the end of the joint port as shown.

【００２０】このＥＦ継手に通電すると、リード線も加
熱され、外部に出ているリード線が高温となり、作業者
の火傷や火災の危険を伴うので、リード線４ａ、４ｂは
断熱材５で被覆して、この危険を回避することが好まし
い。断熱材は、リード線の屈曲が可能となるように柔軟
なものが好ましい。好適な断熱材としては、ガラス繊
維、炭素繊維、ロックウール繊維などの耐熱性繊維材料
が挙げられる。When the EF joint is energized, the lead wire is also heated, and the lead wire exposed to the outside becomes high temperature, which may cause burns or fire of the worker. Therefore, the lead wires 4a and 4b are covered with the heat insulating material 5. Then, it is preferable to avoid this danger. The heat insulating material is preferably flexible so that the lead wire can be bent. Suitable heat insulating materials include heat resistant fiber materials such as glass fibers, carbon fibers, rock wool fibers and the like.

【００２１】具体的には、これらの耐熱性繊維材料の編
組により形成したチューブにリード線を通すことによ
り、リード線部分の金属線を被覆する。断熱材被覆の種
類や厚みは、上記の危険を回避するのに十分な程度にリ
ード線部分の表面温度を低下させることができれば、特
に制限されない。上記のように金属線が絶縁用に耐熱性
絶縁繊維材料（例、ガラス繊維）で被覆されている場合
も、必要により、さらに断熱用に耐熱性繊維材料で被覆
する。所望により、断熱材被覆の周囲をさらに別の保護
被覆で覆うこともできる。Specifically, a lead wire is passed through a tube formed by braiding these heat resistant fiber materials to coat the metal wire in the lead wire portion. The type and thickness of the heat insulating material coating are not particularly limited as long as the surface temperature of the lead wire portion can be lowered to an extent sufficient to avoid the above danger. Even when the metal wire is coated with a heat-resistant insulating fiber material (eg, glass fiber) for insulation as described above, it is further coated with a heat-resistant fiber material for heat insulation, if necessary. If desired, a further protective coating may be provided around the insulation coating.

【００２２】通電時の金属線は、加熱されて高温にな
り、抵抗値が変化する。このとき、断熱材がなければ風
等の影響で抵抗値が変わる場合があるので融着温度のコ
ントロールが難しいが、断熱材でリード線を被覆する
と、金属線からの放熱を防ぐことができるため、このよ
うな抵抗変化が抑制され、融着温度を一定に制御するこ
とが容易となる。When energized, the metal wire is heated to a high temperature and its resistance value changes. At this time, it is difficult to control the fusion temperature because the resistance value may change due to the influence of wind etc. without a heat insulating material, but covering the lead wire with a heat insulating material can prevent heat radiation from the metal wire. Such resistance change is suppressed, and it becomes easy to control the fusion temperature to be constant.

【００２３】図１(a) に示すように、各継手口の端部か
ら引き出された一対のリード線４ａ、４ｂの先端はコン
トローラー接続用のコネクター６に接続されている。コ
ネクター６は、コントローラーの接続部に適合した形状
とする。例えば、この接続部がコンセントである場合に
は、図示のようにプラグの形状とする。As shown in FIG. 1 (a), the tip ends of the pair of lead wires 4a and 4b pulled out from the end portions of the respective joint ports are connected to a connector 6 for controller connection. The connector 6 has a shape adapted to the connecting portion of the controller. For example, when the connecting portion is an outlet, it has a plug shape as shown in the figure.

【００２４】本発明のＥＦ継手は、従来品と同様に使用
できる。即ち、図１(b) に示すように、この継手の両側
の継手口Ａ、Ａ' から継手内部に２本の被接合管 (プラ
スチックパイプ) ７，７' を挿入した後、電源となるコ
ントローラーの接続部に継手のリード線の先端に設けた
コネクター６を接続することによって、所定の電流を金
属線に通電する。金属線の発熱により継手と被接合管の
界面付近の樹脂が溶融し、継手と被接合管が融着する。The EF joint of the present invention can be used in the same manner as conventional products. That is, as shown in Fig. 1 (b), after inserting two pipes (plastic pipes) 7 and 7'to be joined into the joint from the joint ports A and A'on both sides of this joint, the controller to be the power source By connecting the connector 6 provided at the tip of the lead wire of the joint to the connection portion of, a predetermined current is applied to the metal wire. The heat generated by the metal wire melts the resin near the interface between the joint and the pipe to be welded, and the joint and the pipe to be welded to each other.

【００２５】本発明によれば、各継手口が互いに独立し
た電熱回路となるので、継手が３口以上の多口継手であ
っても、全ての継手口をＥＦ継手化することができる。
また、各継手口を別々に通電して被接合管と融着させる
ので、継手が複雑形状であったり、被接合管が大口径で
重い、或いは非常に長いといった、作業しにくい状況で
も、被接合管を１つづつ融着させていけばよいため、作
業が容易となる。According to the present invention, since each joint port serves as an independent electric heating circuit, even if the joint is a multi-port joint having three or more joints, all joint ports can be EF joints.
Further, since each joint port is separately energized to fuse with the pipe to be welded, even if it is difficult to work, such as when the joint has a complicated shape, or the pipe to be welded has a large diameter, is heavy, or is very long. Since it suffices to fuse the joined pipes one by one, the work becomes easy.

【００２６】さらに、図１に示すように、コントローラ
ーとの接続部分をリード線にして長くすることによっ
て、狭所等の作業が困難な場所での施工が容易となる。
また、リード線の先端に取りつけられたコネクター
(例、プラグ) により、確実にコントローラーに接続さ
せることができ、通電量が安定し、接続の信頼性が高ま
る。即ち、作業性が従来のものに比べて著しく改善さ
れ、しかも確実に安定した接続結果を得ることができ
る。Further, as shown in FIG. 1, by making the connecting portion with the controller a lead wire and making it long, the work can be easily carried out in a place where it is difficult to work, such as in a narrow space.
In addition, the connector attached to the tip of the lead wire
(Eg, plug) ensures reliable connection to the controller, stabilizes the amount of electricity, and improves connection reliability. That is, the workability is remarkably improved as compared with the conventional one, and a reliable and stable connection result can be obtained.

【００２７】通電後、リード線を切断することによっ
て、冷却固化中の継手に影響なく次の作業に移行できる
ようになる。また、リード線を根元で切断することによ
り、施工後の継手に不要な突出部分が残るのを防ぐこと
もできる。By cutting the lead wire after energization, it is possible to shift to the next work without affecting the joint being cooled and solidified. In addition, cutting the lead wire at the root can prevent an unnecessary protruding portion from remaining in the joint after construction.

【００２８】本発明のＥＦ継手は、従来と同様に、コア
と金型とからなる専用の射出成形金型を用い、インサー
ト射出成形を行うことにより製造できる。インサート射
出成形は、ワイヤーをコイル状などの所望の巻き方でコ
アに巻きつけ、コアを金型内に装着し、コアと金型との
間隙に樹脂を射出することにより行われる。本発明のＥ
Ｆ継手を製造するには、コアの各継手口部分ごとに１本
のワイヤーを、その両端の余った部分 (延長部分) が同
じ位置から引き出されるように巻き付ける。好ましく
は、同じ位置から引き出されたこの両側の延長部分を利
用して一対のリード線を形成し、射出成形後、各リード
線を適当な断熱材で被覆し、その先端同士をコネクター
に接続する。The EF joint of the present invention can be manufactured by insert injection molding using a dedicated injection molding die comprising a core and a die, as in the conventional case. Insert injection molding is performed by winding a wire around a core in a desired winding manner such as a coil, mounting the core in a mold, and injecting a resin into a gap between the core and the mold. E of the present invention
To manufacture an F-joint, one wire is wound for each joint opening portion of the core so that the excess portions (extension portions) at both ends are pulled out from the same position. Preferably, a pair of lead wires is formed by utilizing the extended portions on both sides drawn from the same position, and after injection molding, each lead wire is covered with a suitable heat insulating material, and the ends thereof are connected to a connector. .

【００２９】ＥＦ継手の製造に用いるワイヤーは、短絡
防止のために耐熱性の絶縁繊維材料を編組して被覆し、
さらに継手本体を構成する樹脂と同種のプラスチック材
料の外被で被覆した二重被覆金属線（以下、被覆線とい
う）とすることが好ましい。こうすると、短絡が確実に
防止される上、この被覆線を密に巻きつけることによっ
て、金属線を均一な間隔で巻きつけることができ、継手
の発熱性能が均質化し、製品の品質が安定化する。使用
する被覆線のプラスチック被覆の厚みは、ＥＦ継手の金
属線の巻き付け間隔および継手の径に応じて決定するこ
とができる。射出成形中に被覆線のプラスチック外被は
射出された溶融樹脂と一体化するので、製造された継手
は、図１(b) に示すように、樹脂中に金属線が埋め込ま
れた構造となる。The wire used for manufacturing the EF joint is braided with a heat-resistant insulating fiber material to prevent short circuit,
Further, it is preferable to use a double coated metal wire (hereinafter referred to as a coated wire) coated with an outer cover made of the same kind of plastic material as the resin forming the joint body. By doing this, short circuits are reliably prevented, and by tightly winding the covered wire, the metal wires can be wound at even intervals, the heat generation performance of the joint is homogenized, and the product quality is stabilized. To do. The thickness of the plastic coating of the coated wire used can be determined according to the winding distance of the metal wire of the EF joint and the diameter of the joint. Since the plastic jacket of the coated wire is integrated with the injected molten resin during injection molding, the manufactured joint has a structure in which the metal wire is embedded in the resin, as shown in Fig. 1 (b). .

【００３０】本発明のＥＦ継手の製造にあっては、各継
手口においてリード線を形成するように、継手に埋め込
まれないワイヤーの両端の延長部分を長くすることが好
ましい。この長いワイヤーの延長部分は、射出成形時に
金型に挟まれる等の問題を起こし易く、またこの部分に
は射出成形時に樹脂が付着しないようにする必要があ
り、円滑な成形作業が阻害される恐れがある。また、ワ
イヤーの延長部分を長く残しておくためには、普通のや
り方では射出成形を１個または２個取り金型で行う必要
がある。In the manufacture of the EF joint of the present invention, it is preferable to lengthen the extended portions at both ends of the wire not embedded in the joint so that the lead wire is formed at each joint opening. The extended portion of this long wire is likely to cause problems such as being caught in a mold during injection molding, and it is necessary to prevent resin from adhering to this portion during injection molding, which hinders smooth molding work. There is a fear. Also, in order to keep the extended portion of the wire long, it is necessary to perform injection molding in one or two molds in the usual way.

【００３１】本発明によれば、金属線、好ましくは上記
の被覆線を巻きつけたコアと金型とを用いたインサート
射出成形を利用して、ワイヤーを金型に挟むといった不
良の恐れのない、多数個取り金型が使用可能な上記ＥＦ
継手の製造方法も提供される。この製造方法を、被覆線
を巻き付けた直管タイプの継手を例として、図２〜図５
により説明する。According to the present invention, there is no risk of defects such as sandwiching the wire in the mold by using insert injection molding using a core wound with a metal wire, preferably the above-mentioned covered wire, and the mold. The above EF that can be used for multi-cavity molds
A method of making the joint is also provided. This manufacturing method will be described with reference to FIGS. 2 to 5 by taking a straight pipe type joint wound with a covered wire as an example.
Will be described.

【００３２】使用するコアおよび金型は、その各継手口
部分ごとに、端部側から順にリード線形成部、金属線引
出し部、および継手形成部を、コアと金型とで相応する
位置に備えている。The core and the die to be used are arranged such that the lead wire forming portion, the metal wire drawing portion, and the joint forming portion are arranged in order from the end side for each joint opening portion in the core and the die. I have it.

【００３３】具体的には、図２に示すように、コア10の
各継手口における外径寸法は、継手形成部11が製造すべ
き継手の継手口の内径相当の径、引出し部12は継手口内
径相当のコアに使用する金属線 (被覆線) を巻き付けた
時の径か、それよりやや大きい径、リード線形成部13も
継手形成部と同様に継手口の内径相当の径となるような
形状を有する。リード線形成部13に被覆線を巻きつけて
おくことにより、リード線となる両端部分の被覆線を金
型に挟み込む危険性が排除される。従って、リード線形
成部の長さは、リード線として必要な長さの被覆線を巻
き付けておくのに十分なものとする。引出し部12のコア
面には、被覆線を両方向に通すために被覆線径と同じ幅
および深さのワイヤー引出し用溝14が２本分形成されて
いる。好ましくは、コアの継手形成部11の中央部15は、
図２に示すように、径を小さくしておく。この小径中央
部15により、継手挿入時のストッパーとなる継手の環状
突出部が形成される。コア10は、各継手口ごとに分割さ
れた分割型でも、一体の型でもよい。Specifically, as shown in FIG. 2, the outer diameter of each joint opening of the core 10 is the diameter corresponding to the inner diameter of the joint opening of the joint to be manufactured by the joint forming portion 11, and the drawing portion 12 is the joint. The diameter of the metal wire (covered wire) used for the core that is equivalent to the inner diameter of the winding, or slightly larger than that, so that the lead wire forming part 13 has a diameter corresponding to the inner diameter of the fitting opening as well as the fitting forming part. It has a unique shape. By winding the coated wire around the lead wire forming portion 13, the risk of sandwiching the coated wire at both end portions to be the lead wire in the mold is eliminated. Therefore, the length of the lead wire forming portion is sufficient to wind the covered wire of a length necessary for the lead wire. In the core surface of the drawn-out portion 12, two wire drawing grooves 14 having the same width and depth as the covered wire diameter are formed in order to pass the covered wire in both directions. Preferably, the central portion 15 of the joint forming portion 11 of the core is
As shown in FIG. 2, the diameter is reduced. The small-diameter central portion 15 forms an annular projecting portion of the joint which serves as a stopper when the joint is inserted. The core 10 may be of a split type in which each joint port is divided, or an integral type.

【００３４】このコア10の各継手口に、図３に示すよう
に被覆線を１本づつ別々に巻き付ける。即ち、被覆線16
は、コアの各継手口の端部側に位置するリード線形成部
13に端から内方に巻き付けた後、引出し部12のワイヤー
引出し用溝14の一方に通して継手形成部11に渡し、さら
に継手形成部に内方に巻き付けていく。継手形成部の最
奥部で被覆線をターンさせて今度は逆方向 (外方) に巻
き付け、引出し溝14の残りの方を通してリード線形成部
12に戻し、さらに外方に巻き付け、継手口の端部で巻き
始めと巻き終わりをそろえておく。実際には、必要な長
さに切断した被覆線をまず中央で折り返して２本とし、
この折り返し (ターン) 部分を起点にして２本の被覆線
をコアの各継手口の最奥 (中心) 側から図３に示すよう
に外方に向かってコアに巻き付け (引出し用溝14は互い
に別の溝を通す) ていけば、容易に巻付けを行うことが
できる。全ての継手口にこのように被覆線を巻き付けて
おく。As shown in FIG. 3, one coated wire is wound around each joint opening of the core 10 separately. That is, the covered wire 16
Is the lead wire forming part located on the end side of each joint opening of the core.
After being wound inwardly from the end to the wire 13, the wire is passed through one of the wire drawing grooves 14 of the drawing portion 12 and passed to the joint forming portion 11, and further wound inward on the joint forming portion. Turn the covered wire at the innermost part of the joint forming part and wind it in the opposite direction (outer direction) this time, and through the remaining part of the lead-out groove 14, form the lead wire forming part.
Return to 12, further wrap it outward, and align the start and end of the winding at the end of the joint opening. Actually, the coated wire cut to the required length is first folded back into two at the center,
Starting from this turn (turn), the two coated wires are wound outward from the innermost (center) side of each joint opening of the core as shown in Fig. 3 (the pull-out grooves 14 are Winding can be done easily by using another groove. Wrap the covered wire in this way around all joint openings.

【００３５】一方、金型20の各継手口部の内径寸法は、
図４に示すように、その継手形成部21が継手の外径相当
の径、引出し部22がコアの引出し部11の外径相当の径、
リード線形成部23が継手内径相当のコアに被覆線を巻き
付けた径に十分余裕をもって離隔した径となる形状とす
る。図示しないが、金型は当然ながら二個以上の分割部
分から構成され、また継手形成部21に樹脂の注入口を備
えている。On the other hand, the inner diameter of each joint opening of the mold 20 is
As shown in FIG. 4, the joint forming portion 21 has a diameter corresponding to the outer diameter of the joint, the lead-out portion 22 has a diameter corresponding to the outer diameter of the lead-out portion 11 of the core,
The lead wire forming portion 23 has a shape in which the diameter is such that the diameter of the coated wire wound around the core corresponding to the inner diameter of the joint is sufficiently separated. Although not shown, the mold is of course composed of two or more divided parts, and the joint forming part 21 is provided with a resin injection port.

【００３６】この金型にコアをはめ込むと、図５に示す
ように、金型の引出し部22はコアの引出し部12と密着す
るので、射出成形により継手形成部に射出された樹脂30
の外側への流出が防止される。引出し部の溝14で、被覆
線と溝との隙間から樹脂が流出するのを防止するには、
引出し部12および22の長さを15 mm 以上とすることが好
ましい。少量の樹脂が被覆線引出し部から流出しても、
リード線形成部には十分な大きさの空間31があるので、
被覆線への樹脂の付着はほとんど起こらない。継手形成
部のコアと金型との隙間に樹脂を射出成形後、コアの各
継手口のリード線形成部に巻き付けられている２本の被
覆線をはずしてリード線とし、必要によりそれぞれを断
熱材で被覆し、２本の被覆線の端にコネクターを装着す
ると、本発明のＥＦ継手が得られる。When the core is fitted in this mold, as shown in FIG. 5, the drawn-out portion 22 of the mold comes into close contact with the drawn-out portion 12 of the core, so that the resin 30 injected into the joint forming portion by injection molding is used.
Outflow is prevented. To prevent the resin from flowing out from the gap between the covered wire and the groove in the groove 14 of the drawer,
It is preferable that the lengths of the drawn-out portions 12 and 22 be 15 mm or more. Even if a small amount of resin flows out from the covered wire drawing part,
Since there is a sufficiently large space 31 in the lead wire forming portion,
Almost no resin adheres to the coated wire. After injection molding resin into the gap between the core and the mold of the joint forming part, remove the two covered wires wound around the lead wire forming part of each joint opening of the core to make lead wires, and insulate each as necessary. When coated with a material and fitted with connectors at the ends of the two coated wires, the EF joint of the present invention is obtained.

【００３７】上記のコアと金型を使用すると、リード線
を形成する被覆線の長い両端部分が、コアのリード線形
成部に巻き付けられているため、コアをこの金型にはめ
込むときに、被覆線の両端部分を金型に挟み込むといっ
た射出成形時の障害がなくなる。さらに、被覆線がすべ
てコアに巻き付けられているため、多数個取りが可能と
なり、生産効率が改善される。When the above core and mold are used, the long ends of the covered wire forming the lead wire are wound around the lead wire forming portion of the core. Therefore, when the core is fitted into the mold, the coating is performed. There is no obstacle at the time of injection molding such as sandwiching both ends of the wire in the mold. Furthermore, since all the covered wires are wound around the core, it is possible to take a large number of wires and the production efficiency is improved.

【００３８】次に実施例により本発明を具体的に例示す
る。Next, the present invention will be illustrated concretely by examples.

【００３９】[0039]

【実施例】本発明の製造方法により、それぞれ継手形成
部、被覆線引出し部およびリード線形成部を有する、４
個取りのコアと金型を用いたインサート射出成形法によ
り外径45 mm のＥＦ継手を製作した。使用した樹脂はポ
リブテンであり、被覆線として、径0.5 mmのNi線をガラ
ス繊維の編組体で被覆し、さらに0.6 mm厚のポリブテン
で被覆したものを用いた。コアと金型の各部の寸法は次
の通りであった。EXAMPLE A manufacturing method according to the present invention has a joint forming portion, a covered wire drawing portion, and a lead wire forming portion, respectively.
An EF joint with an outer diameter of 45 mm was manufactured by an insert injection molding method using a core and a die that were individually taken. The resin used was polybutene, and as the coated wire, Ni wire having a diameter of 0.5 mm was coated with a glass fiber braid and further coated with 0.6 mm thick polybutene. The dimensions of the core and each part of the mold were as follows.

【００４０】 コア（外径） 金型（内径） 長 さ（mm） 継手形成部 34.5 46.5 65 継手形成部中央の小径部 25.5 46.5 5 被覆線引出し部 40 40 15 リード線形成部 34.5 50 25 コアの引出し部には、幅と深さが共に２mmで下半分が半
円形断面の被覆線引出し用の溝を２本設けた。 Core (outer diameter) Mold (inner diameter) Length (mm) Joint forming part 34.5 46.5 65 Small diameter part at the center of joint forming part 25.5 46.5 5 Covered wire drawing part 40 40 15 Lead wire forming part 34.5 50 25 The drawn-out portion was provided with two grooves for drawing the covered wire, each having a width and depth of 2 mm and a lower half having a semicircular cross section.

【００４１】コアに図３に示すように被覆線を巻き付け
た後、コアを金型にはめ込んだ。この時、被覆線のかみ
込みなどの問題は全くなく、円滑に多数個取りのコアと
金型とをはめ込むことができた。次いで、成形温度195
℃、成形圧力300 kg/cm2、金型温度15℃、サイクル時間
３分の条件で、樹脂を継手形成部に射出してＥＦ継手を
成形した。この射出成形を反復実施したところ、リード
線形成部に少量の樹脂が流出することもあったが、この
部分の被覆線には樹脂は付着せず、成形後にコアからは
ずすことによりリード線を支障なく形成することができ
た。After the coated wire was wound around the core as shown in FIG. 3, the core was fitted in the mold. At this time, there was no problem such as biting of the covered wire, and the multiple cores and the mold could be fitted smoothly. Then, the molding temperature 195
° C., molding pressure 300 kg / cm 2, mold temperature 15 ° C., with a cycle time 3 min conditions, were molded EF joints by injecting a resin to the joint forming portion. When this injection molding was repeatedly carried out, a small amount of resin sometimes flowed out to the lead wire forming part, but the resin did not adhere to the covered wire at this part and the lead wire was hindered by removing it from the core after molding. Could be formed without.

【００４２】成形後、各継手の両側のリード線を長さ５
cmに切りそろえ、ガラス繊維を編組した長さ45 mm 、厚
み約0.5 mmの管状の断熱材でリード線を被覆した後、リ
ード線の先端にプラグを接続して、ＥＦ継手を完成させ
た。After molding, connect the lead wires on both sides of each joint to length 5
The lead wire was covered with a tubular heat insulating material having a length of 45 mm and a thickness of about 0.5 mm, which was cut to cm and braided with glass fibers, and then a plug was connected to the tip of the lead wire to complete an EF joint.

【００４３】このＥＦ継手は、狭い箇所でもリード線の
先端のプラグをコントローラーのコンセントに接続する
だけで簡単かつ確実に施工できた。また、通電後、リー
ド線を根元で切断することによって速やかに次の作業に
入ることができ、継手の外面に邪魔な突起が形成するこ
とが避けられた。This EF joint could be easily and reliably constructed by connecting the plug at the tip of the lead wire to the outlet of the controller even in a narrow space. Further, after energization, cutting the lead wire at the root allows the next work to be immediately started, and formation of an obtrusive projection on the outer surface of the joint was avoided.

【００４４】[0044]

【発明の効果】本発明のＥＦ継手は、３口以上の多口継
手であっても、全ての継手口をＥＦ継手化することがで
きる上、作業性が非常によい。即ち、従来のＥＦ継手は
狭所や大口径パイプの作業が困難であったが、場所や被
接合管の種類・重量を選ばずにプラスチックパイプの融
着接続が実施できる。また、リード線の先端のコネクタ
ーをコントローラーの接続部に接続するだけで通電で
き、通電状態が安定し、融着結果のばらつきを生じな
い。しかも、リード線を切断することにより、樹脂の冷
却を待たずに次の作業に速やかに移れるので、作業時間
が短縮される。EFFECTS OF THE INVENTION Even if the EF joint of the present invention is a multi-port joint having three or more ports, all the joint ports can be made into EF joints, and the workability is very good. That is, the conventional EF joint is difficult to work on narrow spaces and large-diameter pipes, but fusion connection of plastic pipes can be performed regardless of the location and the type and weight of the pipes to be joined. In addition, electricity can be supplied only by connecting the connector at the tip of the lead wire to the connection portion of the controller, the energized state is stable, and there is no variation in fusion results. Moreover, by cutting the lead wire, it is possible to quickly move to the next work without waiting for the cooling of the resin, which shortens the work time.

【００４５】本発明のＥＦ継手の製造方法は、射出成形
操作を円滑に行うことができ、しかも多数個取りが可能
である。従って、射出成形時の考えられる不良を避ける
ことができ、しかも成形作業の効率は著しく改善され
る。The method of manufacturing an EF joint according to the present invention enables the injection molding operation to be carried out smoothly, and moreover it is possible to take a large number of pieces. Therefore, possible defects during injection molding can be avoided, and the efficiency of the molding operation is significantly improved.

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

【図１】図１(a) は本発明のＥＦ継手の説明図、図１
(b) は、被接合管が差し込まれた状態の本発明のＥＦ継
手の略式部分拡大断面図を示す。FIG. 1 (a) is an explanatory view of an EF joint of the present invention, FIG.
(b) is a schematic partial enlarged cross-sectional view of the EF joint of the present invention with the pipe to be joined inserted.

【図２】コアの外面形状を示す説明図である。FIG. 2 is an explanatory diagram showing an outer surface shape of a core.

【図３】コアに被覆線を巻き付けた状態を示す説明図で
ある。FIG. 3 is an explanatory diagram showing a state in which a covered wire is wound around a core.

【図４】金型の内面形状を示す断面説明図である。FIG. 4 is a cross-sectional explanatory view showing an inner surface shape of a mold.

【図５】図４に示す金型に図３に示すコアを装着した
後、樹脂を注入した状態を示す説明図である。5 is an explanatory diagram showing a state where resin is injected after the core shown in FIG. 3 is mounted on the mold shown in FIG.

【符号の説明】[Explanation of symbols]

１：継手本体 ２：樹脂スリーブ Ａ, Ａ' ：継手口 Ｂ, Ｂ' ：融着部 ３：金属線 ４ａ, ４ｂ：リード
線 ５：断熱材被覆 ６：コネクター 7, 7' ：被接合管 10：コア 16：被覆線 20：金型 11, 21：継手形成部 12, 22：被覆線引出
し部 13, 23：リード線形成部 14：被覆線引出し用
溝 30：樹脂 31：引出し部空間1: Joint body 2: Resin sleeve A, A ': Joint port B, B': Fusion part 3: Metal wire 4a, 4b: Lead wire 5: Insulation material coating 6: Connector 7, 7 ': Pipe to be joined 10 : Core 16: Coated wire 20: Mold 11, 21: Joint forming part 12, 22: Coated wire drawing part 13, 23: Lead wire forming part 14: Coated wire drawing groove 30: Resin 31: Drawing part space

フロントページの続き (72)発明者 塩崎 憲司 和歌山市湊1850番地 住友金属工業株式会 社和歌山製鉄所内Front page continued (72) Inventor Kenji Shiozaki 1850 Minato, Wakayama City Sumitomo Metal Industries, Ltd. Wakayama Works

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 内周部に加熱用金属線を埋め込んだプラ
スチック製電熱融着継手であって、各継手口に埋め込ま
れた金属線が他の継手口に埋め込まれた金属線と接続し
ておらず、各継手口ごとに別々に融着作業することがで
きることを特徴とする、プラスチック製電熱融着継手。1. A plastic electrothermal fusion joint in which a heating metal wire is embedded in an inner peripheral portion, wherein a metal wire embedded in each joint opening is connected to a metal wire embedded in another joint opening. A plastic electrothermal fusion joint, characterized in that the fusion work can be performed separately for each joint opening. 【請求項２】 各継手口から引き出された断熱材で被覆
された一対のリード線を備え、各対のリード線の先端に
コントローラー接続用コネクターが装着されていること
を特徴とする、請求項１記載のプラスチック製電熱融着
継手。2. A pair of lead wires covered with a heat insulating material drawn out from each joint opening is provided, and a controller connection connector is attached to the tip of each pair of lead wires. 1. A plastic electrothermal fusion joint as described in 1. 【請求項３】 金属線を巻付けたコアと金型とを用いた
インサート射出成形によりプラスチック製電熱融着継手
を製造する方法であって、 コアと金型が、その各継手口部分ごとに、端部側から順
にリード線形成部、金属線引出し部、および継手形成部
を、コアと金型とで相応する位置に備え、 コアの外径は、継手形成部およびリード線形成部が該継
手口の内径相当の径、引出し部はほぼ継手口内径相当の
コアに該金属線を巻付けた時の径であり、引出し部のコ
ア面に、該金属線径と同じ幅および深さのワイヤー引出
し用溝が２本設けられ、 金型の内径は、継手形成部が該継手口の外径相当の径、
引出し部はコアの引出し部の外径相当の径、リード線形
成部は継手口内径相当のコアに該金属線を巻付けた径に
十分余裕をもって離隔した径であり、 コアの各継手口の継手形成部、引出し部、およびリード
線形成部に、継手口ごとに別の金属線を巻き付けた後、
金型内にコアを装着し、継手形成部のコアと金型の間隙
に樹脂を射出することを特徴とする、請求項１または２
記載のプラスチック製電熱融着継手の製造方法。3. A method for manufacturing a plastic electrothermal fusion joint by insert injection molding using a core wound with a metal wire and a mold, wherein the core and the mold are each for each joint mouth portion. , A lead wire forming portion, a metal wire lead-out portion, and a joint forming portion are provided in order from the end side at positions corresponding to the core and the die, and the outer diameter of the core is the joint forming portion and the lead wire forming portion. The diameter equivalent to the inner diameter of the joint opening, the drawn portion is the diameter when the metal wire is wound around the core substantially equivalent to the inner diameter of the joint opening, and the core surface of the drawn portion has the same width and depth as the metal wire diameter. Two wire drawing grooves are provided, and the inner diameter of the mold is such that the joint forming portion has a diameter corresponding to the outer diameter of the joint opening.
The lead-out portion has a diameter corresponding to the outer diameter of the core lead-out portion, and the lead wire forming portion has a diameter separated from the diameter corresponding to the inner diameter of the joint opening by winding the metal wire around the core with a sufficient margin. After winding another metal wire for each joint opening on the joint forming part, the drawing part, and the lead wire forming part,
The core is mounted in the mold, and the resin is injected into a gap between the core of the joint forming portion and the mold.
A method for producing a plastic electrothermal fusion joint as described.
JP15821092A 1992-06-17 1992-06-17 Method of manufacturing plastic electrothermal fusion joint Expired - Fee Related JP3203770B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15821092A JP3203770B2 (en) 1992-06-17 1992-06-17 Method of manufacturing plastic electrothermal fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15821092A JP3203770B2 (en) 1992-06-17 1992-06-17 Method of manufacturing plastic electrothermal fusion joint

Publications (2)

Publication Number Publication Date
JPH062795A true JPH062795A (en) 1994-01-11
JP3203770B2 JP3203770B2 (en) 2001-08-27

Family

ID=15666692

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15821092A Expired - Fee Related JP3203770B2 (en) 1992-06-17 1992-06-17 Method of manufacturing plastic electrothermal fusion joint

Country Status (1)

Country Link
JP (1) JP3203770B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010463A1 (en) * 1995-09-13 1997-03-20 Fusion Group Plc Electrofusion couplers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010463A1 (en) * 1995-09-13 1997-03-20 Fusion Group Plc Electrofusion couplers

Also Published As

Publication number Publication date
JP3203770B2 (en) 2001-08-27

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