JP3203692B2 - Method of manufacturing plastic electrothermal fusion joint - Google Patents

Method of manufacturing plastic electrothermal fusion joint

Info

Publication number
JP3203692B2
JP3203692B2 JP17839091A JP17839091A JP3203692B2 JP 3203692 B2 JP3203692 B2 JP 3203692B2 JP 17839091 A JP17839091 A JP 17839091A JP 17839091 A JP17839091 A JP 17839091A JP 3203692 B2 JP3203692 B2 JP 3203692B2
Authority
JP
Japan
Prior art keywords
joint
wire
core
diameter
lead
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.)
Expired - Fee Related
Application number
JP17839091A
Other languages
Japanese (ja)
Other versions
JPH0579592A (en
Inventor
徹 上西
和弘 堀江
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.)
Nippon Steel Corp
Original Assignee
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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP17839091A priority Critical patent/JP3203692B2/en
Publication of JPH0579592A publication Critical patent/JPH0579592A/en
Application granted granted Critical
Publication of JP3203692B2 publication Critical patent/JP3203692B2/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
    • 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
    • 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
    • B29C65/02—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
    • 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
    • B29C66/01—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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • B29C66/8742—Safety measures or devices for operators
    • 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)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は電熱融着継手(electric
fusion joint、以下ＥＦ継手と略記する) の製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention
fusion joint, on the manufacturing method of the EF joint and abbreviated) below.

【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、また、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 mainly used. The mechanical joint method is a connection method using a metal joint and is simple in construction, but lacks some reliability. The heat fusion method is a method in which the joint is made of plastic like the pipe, and the bonding surfaces (the inner surface of the joint and the outer surface of the pipe) are melted by a heater or the like before joining, and then fused. Although this method has high reliability, it has disadvantages such as a large fusing machine, difficulty in construction, skill, and a large difference in finish among individuals. The adhesive method is a method of connecting with an adhesive,
There is a problem that there is a great difference between individuals in the construction, and it cannot be used for pipes using an olefin-based resin which is non-polar and hardly wetted with an 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、継手の内面
にコイル状に周回させて加熱用金属線 (ワイヤー) を埋
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 disadvantages is an electrothermal fusion joint, that is, an EF joint. An EF joint is a joint having a structure in which a heating metal wire (wire) is embedded in a coil shape on the inner surface of the joint, and the wire is wound around a core in a coil shape, attached to a mold, and used with an injection molding machine. And can be manufactured by insert molding. In an EF joint, after inserting a pipe into the joint, a wire is connected to a controller that controls the amount of electricity from the power supply, and electricity is supplied to the coil on the inner surface of the joint to generate heat, thereby melting the joint surface between the joint and the pipe. Bonding is performed.

【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。[0004] As a conventional method of connecting a controller of an EF joint to a controller, a pin serving as a plug is set 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 and connected to the controller. Has been adopted in which a lead wire is sandwiched between clips by a clip or the like.

【０００５】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る。従って、通電後速やかに次の作
業に移ることができない。また、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
が低下する。In the method of setting pins on the joint, it is difficult to connect to the controller in a narrow place, and if the outlet is disconnected immediately after energization, the plastic inside the joint is still in a molten state. It may come off without being fixed. Therefore, it is not possible to proceed to the next operation immediately after the energization. In addition, in the method in which the lead wire is sandwiched by the clip at the connection part of the controller, the contact resistance between the clip and the lead wire is not constant, so that the pipe cannot always be fused under the same energizing conditions, and the reliability of the fusion Decrease.

【０００６】[0006]

【発明が解決しようとする課題】本発明の目的は、接続
の信頼性が高く、しかも狭所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。SUMMARY OF THE INVENTION An object of the present invention is to provide an EF joint which has high connection reliability, can be easily constructed even in a narrow place, and has excellent workability in completing pipe connection in a short time. That is.

【０００７】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。[0007] Another object of the present invention is to provide the above-mentioned E, which is capable of smoothly insert-molding a joint with a multi-cavity mold.
An object of the present invention is to provide a method for manufacturing an F joint.

【０００８】[0008]

【課題を解決するための手段】本発明者らは、継手から
出るコントローラーとの接続部分を長めのリード線と
し、その先端にコネクターを設けることによって、作業
性のよいＥＦ継手を開発することに成功した。Means for Solving the Problems The inventors of the present invention have developed an EF joint having good workability by providing a long lead wire at a connection portion with a controller coming out of the joint and providing a connector at the end thereof. Successful.

【０００９】[0009]

【００１０】本発明により、金属線を樹脂被覆した被覆
線を巻き付けたコアと金型とを用いたインサート射出成
形法を利用した上記ＥＦ継手の製造方法が提供される。
この製造方法は、互いに相応する位置に継手形成部と、
その両側の被覆線引き出し部と、さらにその外側のリー
ド線形成部とを備えたコアと金型とを使用し、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の内径
相当の径、引き出し部が継手内径相当のコアに該被覆線
を巻き付けた時の径であり、引き出し部のコア面に該被
覆線径と同じ幅および深さのワイヤー引き出し用溝を有
し、金型の内径は、継手形成部が該継手の外径相当の
径、引き出し部が継手内径相当のコアに該被覆線を巻き
付けた時の径、リード線形成部が継手内径相当のコアに
該被覆線を巻き付けた径に十分余裕をもって離隔した径
であり、コアの継手形成部、引き出し部、およびリード
線形成部に該被覆線を巻き付けた後、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
ことを特徴とする方法である。According to the present invention, there is provided a method of manufacturing the above-mentioned EF joint using an insert injection molding method using a core and a mold around which a metal wire is coated with a resin-coated wire.
This manufacturing method, the joint forming portion at a position corresponding to each other,
A core and a mold are used, each having a covered wire lead-out portion on both sides thereof, and a lead wire forming portion on the outside thereof, and the outer diameter of the core is equivalent to the inner diameter of the joint forming portion and the lead wire forming portion. The diameter of the drawn wire is the diameter when the covered wire is wound around the core equivalent to the joint inner diameter, and the core surface of the drawn portion has a wire drawing groove of the same width and depth as the covered wire diameter, and The inner diameter of the mold is such that the joint forming part has a diameter corresponding to the outer diameter of the joint, the drawing part has a diameter when the covered wire is wound around the core corresponding to the joint inner diameter, and the lead wire forming part has a diameter corresponding to the joint inner diameter. The diameter is sufficiently separated from the diameter around which the wire is wound, and after the coated wire is wound around the joint forming portion, the lead portion, and the lead wire forming portion of the core, the core is mounted in a mold, and the joint forming portion is formed. Characterized by injecting resin into the gap between the core and the mold It is.

【００１１】[0011]

【作用】プラスチックパイプと継手の接続は、施工場所
の条件に関係なく容易に作業できる必要がる。特に、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。同時に、パイプの接続
が長期的に確実に維持されるように接続の信頼性が高い
ことも要求される。本発明によれば、これらの条件を満
たすＥＦ継手が得られる。[Function] The connection between the plastic pipe and the joint must be easily performed irrespective of the conditions of the construction place. In particular, since work in a narrow place or the like is difficult and often involves danger, it is essential that the work can be easily performed. At the same time, it is also required that the reliability of the connection be high so that the connection of the pipe is reliably maintained in the long term. According to the present invention, an EF joint satisfying these conditions is obtained.

【００１２】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、継手の外部構造である
リード線とコネクターを本発明に従って設ける限り、Ｅ
Ｆ継手の形状および構造は変更することができる。例え
ば、継手は曲管タイプあるいは分岐管タイプであっても
よい。FIG. 1 shows one example of the EF joint of the present invention.
This shows a straight pipe type joint. The shape of the EF joint of the present invention is not limited to the illustrated one. That is, as long as the lead wire and the connector, which are the external structures of the joint, are provided according to the present invention, E
The shape and structure of the F-joint can vary. For example, the fitting may be of a curved tube type or a branch tube type.

【００１３】図１(a) および(b) に示したＥＦ継手の継
手本体１は、従来のＥＦ継手と同様の構造を有する。即
ち、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。The joint body 1 of the EF joint shown in FIGS. 1A and 1B has a structure similar to that of a conventional EF joint. That is, the joint body 1 is composed of a resin sleeve 2 and a heating metal wire 3 embedded in the inner peripheral portion thereof.

【００１４】金属線は継手内周部の全面に設けてもよい
が、プラスチックパイプとの熱融着を行う部分のみに設
けることも可能である。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の間隔をとっ
て、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 metal wire may be provided on the entire surface of the inner peripheral portion of the joint, but may be provided only on a portion for performing heat fusion with the plastic pipe. In order to melt the resin uniformly, the metal wire is wound as uniformly as possible. The winding interval of the metal wire may be set so that there is no danger of short-circuit, and may be selected so that the desired resin can be melted and heated in a short time.

【００１５】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、ニクロム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 the same as that of a conventional EF joint. That is, the sleeve 2 is usually made of the same type of thermoplastic resin as the plastic pipe that is the pipe to be joined. For example, polyethylene, polybutene and the like are exemplified. The metal wire 3 is made of a metal or an alloy such as Ni, Cu, Cu-Ni, or nichrome that can be efficiently resistance heated.

【００１６】本発明によれば、継手本体１から一対のリ
ード線４が引き出され、リード線の先端にはコントロー
ラー接続用のコネクター５が装着されている。リード線
４は、金属線３の両側の延長部分であって、従って、金
属線３の両端に連続しており、金属線と同一の材料から
なる。２本のリード線４は、継手本体１の任意の位置か
ら引き出すことができるが、図示のように継手の両端部
から引き出すのが製造が容易であり好都合である。コネ
クター５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。According to the present invention, a pair of lead wires 4 is pulled out from the joint body 1, and a connector 5 for connecting to a controller is mounted at the tip of the lead wire. The lead wire 4 is an extension on both sides of the metal wire 3 and is therefore continuous at both ends of the metal wire 3 and is made of the same material as the metal wire. The two lead wires 4 can be pulled out from any position of the joint body 1, but it is easy and convenient to draw out from both ends of the joint as shown in the figure. The connector 5 has a shape suitable for the connection part of the controller. For example, when the connection portion is an outlet, the connection portion has a plug shape as illustrated.

【００１７】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４は断熱材６
で被覆して、この危険を回避する。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
ル繊維などの耐火性繊維材料が挙げられる。具体的に
は、これらの繊維を編織して製造したチューブにリード
線を通すことにより、リード線を断熱材で被覆すること
ができる。断熱材の種類や厚みは、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。所望により、断
熱材被覆をさらに別の保護被覆で覆うこともできる。When the EF joint is energized, the lead wire is also heated and the temperature of the external lead wire becomes high, which may cause a burn or fire hazard to the worker.
To avoid this danger. The heat insulating material is preferably flexible so that the lead wire can be bent. Suitable thermal insulators include refractory fiber materials such as glass fibers, carbon fibers, rock wool fibers, and the like. Specifically, the lead wire can be covered with a heat insulating material by passing the lead wire through a tube manufactured by knitting and weaving these fibers. The type and thickness of the heat insulating material are not particularly limited as long as the surface temperature of the lead wire portion can be reduced to a sufficient degree to avoid the above danger. If desired, the thermal insulation coating can be further covered by a further protective coating.

【００１８】また、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。Further, the metal wire when energized is heated to a high temperature, and the resistance value changes. At this time, if there is no heat insulating material, the resistance value may change due to the influence of wind or the like, so it is difficult to control the fusion temperature.However, if the heat insulating material covers the lead wire, heat radiation from the metal wire can be prevented. Such a change in resistance is suppressed, and it becomes easy to control the fusion temperature to be constant.

【００１９】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
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５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 a conventional product. That is, as shown in FIG. 1 (b), two joined pipes (plastic pipes) are inserted into the joint from both sides of the joint.
After the insertion of the connectors 7 and 7, a predetermined current is supplied to the metal wire by connecting the connector 5 provided at the end of the lead wire of the joint to the connection portion of the controller serving as a power supply. The resin near the interface between the joint and the pipe to be connected is melted by the heat generated by the metal wire, and the joint and the pipe to be connected are fused.

【００２０】本発明によれば、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。According to the present invention, by making the connection portion with the controller a lead wire and making it long, it is easy to perform construction in a place such as a narrow place where work is difficult. In addition, a connector (eg, plug) attached to the end of the lead wire ensures connection to the controller,
The amount of electricity is stable, and the reliability of the connection increases. That is, workability is remarkably improved as compared with the conventional one, and moreover, a stable connection result can be reliably obtained.

【００２１】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。After energization, the lead wire is cut so that the next operation can be performed without affecting the joint during cooling and solidification. In addition, by cutting the lead wire at the root, it is possible to prevent an unnecessary protruding portion from remaining in the joint after construction.

【００２２】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。成形時に、
ワイヤーの両側の延長部分が継手本体から突出するよう
にワイヤーを長くし、一対のリード線を形成する。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と、本発明のＥＦ継手が得られ
る。The EF joint of the present invention can be manufactured by performing insert injection molding using a dedicated injection mold including a core and a mold, 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 shape, mounting the core in a mold, and injecting a resin into a gap between the core and the mold. During molding,
The wire is lengthened such that extensions on both sides of the wire protrude from the joint body to form a pair of leads. After molding, each lead wire is covered with a suitable heat insulating material, and the ends thereof are connected to a connector to obtain the EF joint of the present invention.

【００２３】ＥＦ継手の製造に用いるワイヤーは、継手
本体を構成する樹脂と同種の樹脂材料で加熱用金属線を
被覆したプラスチック被覆金属線（以下、被覆線とい
う）とすることが好ましい。こうすると、ワイヤーをコ
アに巻きつける時に、ショートを引き起こす金属線同士
の接触を確実に避けることができると共に、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 preferably a plastic-coated metal wire (hereinafter, referred to as a coated wire) in which a heating metal wire is coated with the same kind of resin material as the resin constituting the joint body. By doing so, when winding the wire around the core, it is possible to reliably avoid contact between the metal wires causing a short circuit, and it is possible to wind the metal wires at uniform intervals by tightly winding the covered wire, The heat generation performance of the joint is homogenized, and the quality of the product is stabilized. The thickness of the plastic covering of the covering wire to be used can be determined according to the winding interval of the metal wire of the EF joint and the diameter of the joint. Since the plastic jacket of the covered wire is integrated with the injected molten resin during the injection molding, the manufactured joint has a structure in which the metal wire is embedded in the resin as shown in FIG. 1 (b). .

【００２４】本発明のＥＦ継手の製造にあっては、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
の両端部分を長くする必要がある。この長いワイヤーの
両端部分は、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、ワイヤーの両端部分を長く残して
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 necessary to lengthen both ends of the wire not embedded in the joint so as to form a lead wire. Both ends of this long wire are liable 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 fear. In addition, in order to keep both ends of the wire long, it is necessary to perform one or two injection molding in a usual manner.

【００２５】本発明によれば、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 fear of a defect such as pinching the wire between the molds by using insert injection molding using the core and the mold around which the coated wire is wound.
There is also provided a method of manufacturing the above EF joint in which a multi-cavity mold can be used. This manufacturing method will be described with reference to FIGS.

【００２６】使用するコアおよび金型は、互いに相応す
る位置に継手形成部と、その両側の被覆線引き出し部
と、さらにその外側のリード線形成部とを備えている。The core and the mold to be used are provided with a joint forming part, a covered wire lead-out part on both sides thereof, and a lead wire forming part outside the joint forming part at positions corresponding to each other.

【００２７】具体的には、図２に示すように、コア１０
は、その外径が、継手形成部１１は製造すべき継手の内
径相当の径、引き出し部１２は継手内径相当のコアに使
用する被覆線を巻き付けた時の径、リード線形成部１３
は継手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。引き出し部１２のコア面には、被覆
線を通すために被覆線径と同じ幅および深さのワイヤー
引き出し用溝１４が形成されている。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。More specifically, as shown in FIG.
Is the outer diameter, the joint forming part 11 is the diameter corresponding to the inner diameter of the joint to be manufactured, the lead-out part 12 is the diameter when the coated wire used for the core corresponding to the joint inner diameter is wound, the lead wire forming part 13
Has a shape corresponding to the inner diameter of the joint. By winding the covered wire around the lead wire forming portion 13,
The danger of pinching the covered wires at both ends, which will be the lead wires, in the mold is eliminated. Therefore, the length of the lead wire forming portion is sufficient to wind a covered wire having a necessary length as a lead wire. On the core surface of the lead portion 12, a wire lead groove 14 having the same width and depth as the diameter of the covered wire is formed to pass the covered wire. Preferably, the central part 15 of the joint forming part 11 of the core is, as shown in FIG.
Keep the diameter small. The small-diameter portion 15 forms an annular protrusion of the joint that serves as a stopper when the joint is inserted.

【００２８】このコア１０の継手形成部１１、引き出し
部１２およびリード線形成部１３に図３に示すように被
覆線を巻き付ける。即ち、被覆線２０は、コアの片方の
リード線形成部に巻き付けた後、引き出し部のワイヤー
引き出し用ミゾに通して継手形成部に渡し、継手形成部
に巻き付けてから、同様に他方の引き出し部の溝に通し
て、反対側のリード線形成部に渡してこの部分に巻き付
ける。As shown in FIG. 3, a covered wire is wound around the joint forming portion 11, the lead portion 12, and the lead wire forming portion 13 of the core 10. That is, the coated wire 20 is wound around one lead wire forming portion of the core, passed through the wire drawing groove of the drawer portion to the joint forming portion, wound around the joint forming portion, and then similarly wound into the other drawer portion. Through the groove, and over the lead wire forming part on the opposite side, and wrap it around this part.

【００２９】一方、金型３０は、図４に示すように、そ
の内径が、継手形成部３１は継手の外径相当の径、引き
出し部３２は継手内径相当のコアに被覆線を巻き付けた
時の径、リード線形成部３３は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、また樹脂の注入口を備えて
いる。On the other hand, as shown in FIG. 4, the mold 30 has an inner diameter, the joint forming portion 31 has a diameter corresponding to the outer diameter of the joint, and the drawer portion 32 has a core wire corresponding to the inner diameter of the joint. And the lead wire forming portion 33 is formed to have a diameter sufficiently separated from the diameter of the core wire corresponding to the joint inner diameter by winding the covered wire with a sufficient margin. Although not shown, the mold is, of course, composed of two or more divided parts and has a resin injection port.

【００３０】この金型にコアをはめ込むと、図５に示す
ように、金型の引き出し部３２はコアの引き出し部１２
と密着するので、継手形成部に射出された樹脂４０の外
側への流出が防止される。引き出し部の溝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、
引き出し部１２および３２の長さを１５mm以上とするこ
とが好ましい。少量の樹脂が被覆線引き出し部から流出
しても、リード線形成部には十分な大きさの空間４１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。When the core is fitted into the mold, as shown in FIG. 5, the lead-out portion 32 of the mold becomes the lead-out portion 12 of the core.
Therefore, the resin 40 injected into the joint forming portion is prevented from flowing out. To prevent the resin from flowing out of the gap between the covering wire and the groove in the groove 14 of the drawer,
It is preferable that the length of the drawers 12 and 32 be 15 mm or more. Even if a small amount of resin flows out of the covered wire lead-out part, the resin is hardly attached to the covered wire because the lead wire forming part has a sufficiently large space 41.

【００３１】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 core and the mold described above are used, the long end portions of the covered wire forming the lead wire are wound around the lead wire forming portion of the core. Obstacles at the time of injection molding such as sandwiching both ends of the wire between the molds are eliminated. Furthermore, since all of the covered wires are wound around the core, it is possible to take multiple pieces and improve production efficiency.

【００３２】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 specifically illustrated by way of examples.

【００３３】[0033]

【実施例】本発明の製造方法により、それぞれ継手形成
部、被覆線引き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２７mmのＥＦ継手を製作した。使用した樹脂は
ポリブテンであり、被覆線は同じ樹脂を径0.5 mmのＮｉ
線に0.6 mm厚で被覆したものであった。コアと金型の各
部の寸法は次の通りであった。 コア（外径） 金型（内径） 長 さ（mm） 継手形成部 17.5 27.5 60 継手形成部中央の小径部 13.5 27.5 35 被覆線引き出し部 25 25 15 リード線形成部 17.5 35 25 コアの引き出し部には、幅と深さが共に２mmで下半分が
半円形断面の被覆線引き出し用の溝を設けた。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the manufacturing method of the present invention, a joint forming portion, a covered wire drawing portion and a lead wire forming portion are provided.
An EF joint having an outer diameter of 27 mm was manufactured by insert injection molding using a four-piece core and a mold. The resin used is polybutene, and the coated wire is the same resin made of Ni 0.5 mm in diameter.
The wire was coated at a thickness of 0.6 mm. The dimensions of each part of the core and the mold were as follows. Core (outer diameter) Die (inner diameter) Length (mm) Joint forming part 17.5 27.5 60 Small diameter part in center of joint forming part 13.5 27.5 35 Coated wire lead-out part 25 25 15 Lead wire forming part 17.5 35 25 To core lead-out part Has a groove for drawing out a covered wire having a width and a depth of 2 mm and a lower half having a semicircular cross section.

【００３４】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１９
５℃、成形圧力３００kg/cm2、金型温度１５℃、サイク
ル時間２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 into a mold. At this time, there was no problem such as entrapment of the covered wire, and the multi-cavity core and the mold could be smoothly fitted. Next, the molding temperature 19
Under a condition of 5 ° C., a molding pressure of 300 kg / cm 2 , a mold temperature of 15 ° C., and a cycle time of 2 minutes, the resin was injected into the joint forming portion to form an EF joint. When this injection molding was repeatedly performed, a small amount of resin sometimes flowed out to the lead wire forming part,
The resin did not adhere to the covered wire in this portion, and the lead wire could be formed without hindrance by removing it from the core after molding.

【００３５】成形後、各継手の両側のリード線を長さ１
６cmに切りそろえ、ガラス繊維を編んで作った長さ１５
cm、肉厚約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 a length of 1.
Cut into 6cm, woven from glass fiber, length 15
After covering the lead wire with a tubular heat insulating material having a thickness of about 0.5 mm and a thickness of about 0.5 mm, a plug was connected to the end of the lead wire to complete an EF joint.

【００３６】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 even in a narrow place simply by connecting the plug at the end of the lead wire to the outlet of the controller. Further, after energization, the next operation can be started promptly by cutting the lead wire at the root, and formation of an obstructive projection on the outer surface of the joint was avoided.

【００３７】[0037]

【発明の効果】本発明のＥＦ継手は作業性が非常によ
い。即ち、従来のＥＦ継手は狭所での作業が困難であっ
たが、場所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。The EF joint of the present invention has very good workability. That is, although the conventional EF joint is difficult to work in a narrow place, fusion splicing of a plastic pipe can be carried out regardless of the place. In addition, current can be supplied simply by connecting the connector at the end of the lead wire to the connection portion of the controller, so that the power supply state is stable and there is no variation in the fusion result. Moreover,
By cutting the lead wire, it is possible to quickly move to the next operation without waiting for the resin to cool, thereby shortening the operation time.

【００３８】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 for manufacturing an EF joint according to the present invention allows the injection molding operation to be performed smoothly and allows a large number of pieces to be formed. Thus, 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 the 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 in a state where a pipe to be joined is 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 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 view showing a state where 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 an explanatory sectional 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。FIG. 5 is an explanatory view showing a state in which the core shown in FIG. 3 is mounted on the mold shown in FIG. 4 and then a resin is injected.

【符号の説明】[Explanation of symbols]

１：継手本体 ２：樹脂スリーブ ３：金属線 ４：リード線 ５：コネクター ６：断熱材被覆 ７：被接合管 １０：コア ２０：被覆線 ３０：金型 １１，３１：継手形成部 １２，３２：被覆線
引き出し部 １３，３３：リード線形成部 １４：被覆線引き出
し用溝 ４０：樹脂 ４１：引き出し部空
間1: Joint body 2: Resin sleeve 3: Metal wire 4: Lead wire 5: Connector 6: Insulation material coating 7: Pipe to be joined 10: Core 20: Coated wire 30: Die 11, 31: Joint forming part 12, 32 : Covered wire lead-out part 13, 33: Lead wire forming part 14: Covered wire lead-out groove 40: Resin 41: Lead-out part space

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F16L 47/00 - 47/02 B29C 45/14 B29C 65/36 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) F16L 47/00-47/02 B29C 45/14 B29C 65/36

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 金属線を樹脂被覆した被覆線を巻き付け
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、 互いに相応する位置に継手形成部と、その両側の被覆線
引き出し部と、さらにその外側のリード線形成部とを備
えたコアと金型とを使用し、 コアの外径は、継手形成部およびリード線形成部が該継
手の内径相当の径、引き出し部が継手内径相当のコアに
該被覆線を巻き付けた時の径であり、引き出し部のコア
面に該被覆線径と同じ幅および深さのワイヤー引き出し
用溝を有し、 金型の内径は、継手形成部が該継手の外径相当の径、引
き出し部が継手内径相当のコアに該被覆線を巻き付けた
時の径、リード線形成部が継手内径相当のコアに該被覆
線を巻き付けた径に十分余裕をもって離隔した径であ
り、 コアの継手形成部、引き出し部、およびリード線形成部
に該被覆線を巻き付けた後、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、プラスチック製電熱融着継手の製造方法。1. A method for producing a plastic electrothermally welded joint by insert injection molding using a core and a mold around which a metal wire is coated with a resin-coated wire, wherein a joint forming part is provided at a position corresponding to each other. And a core having a covered wire lead-out portion on both sides thereof, and a lead wire forming portion on the outside thereof, and a die, wherein the outer diameter of the core is such that the joint forming portion and the lead wire forming portion are The diameter corresponding to the inner diameter, the diameter of the drawn part is the diameter when the coated wire is wound around the core equivalent to the joint inner diameter, and the core surface of the drawn part has a wire drawing groove of the same width and depth as the diameter of the coated wire. The inner diameter of the mold is such that the joint forming part has a diameter corresponding to the outer diameter of the joint, the drawer part has a diameter when the covered wire is wound around the core corresponding to the joint inner diameter, and the lead wire forming part has a core corresponding to the joint inner diameter. Make sure there is enough room for the diameter After the coated wire is wound around the joint forming part, the lead-out part, and the lead wire forming part of the core, the core is mounted in the mold, and the gap between the core of the joint forming part and the mold is formed. A method for producing a plastic electrothermal fusion joint, comprising injecting a resin.
JP17839091A 1991-07-18 1991-07-18 Method of manufacturing plastic electrothermal fusion joint Expired - Fee Related JP3203692B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17839091A JP3203692B2 (en) 1991-07-18 1991-07-18 Method of manufacturing plastic electrothermal fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17839091A JP3203692B2 (en) 1991-07-18 1991-07-18 Method of manufacturing plastic electrothermal fusion joint

Publications (2)

Publication Number Publication Date
JPH0579592A JPH0579592A (en) 1993-03-30
JP3203692B2 true JP3203692B2 (en) 2001-08-27

Family

ID=16047662

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17839091A Expired - Fee Related JP3203692B2 (en) 1991-07-18 1991-07-18 Method of manufacturing plastic electrothermal fusion joint

Country Status (1)

Country Link
JP (1) JP3203692B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101730250B1 (en) 2015-08-27 2017-04-26 주식회사 코모텍 Method for connecting thermoplastic pipe

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8257815B2 (en) 2009-05-04 2012-09-04 Korea Advanced Institute Of Science And Technology Vacuum insulator
KR101105324B1 (en) * 2009-10-20 2012-01-16 한국과학기술원 Vacuum insulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101730250B1 (en) 2015-08-27 2017-04-26 주식회사 코모텍 Method for connecting thermoplastic pipe

Also Published As

Publication number Publication date
JPH0579592A (en) 1993-03-30

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