JPH1026284A - Electrical fusion type plastic pipe joint - Google Patents
Electrical fusion type plastic pipe jointInfo
- Publication number
- JPH1026284A JPH1026284A JP8178352A JP17835296A JPH1026284A JP H1026284 A JPH1026284 A JP H1026284A JP 8178352 A JP8178352 A JP 8178352A JP 17835296 A JP17835296 A JP 17835296A JP H1026284 A JPH1026284 A JP H1026284A
- Authority
- JP
- Japan
- Prior art keywords
- heating wire
- winding
- connector pin
- pipe joint
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
- B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—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
- B29C66/52298—Joining tubular articles involving the use of a socket said socket being composed by several elements
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Surface Heating Bodies (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電気融着式プラス
チック管継手の電熱線とコネクターピンの接続構造に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a heating wire and a connector pin of an electrofusion type plastic pipe joint.
【０００２】[0002]
【従来の技術】従来、電気融着式プラスチック管継手
（以下電気融着継手ということがある。）の電熱線とコ
ネクターピンの接続構造としては実公平５−２０９５７
号公報に開示され図３に示すものがある。この電気融着
式継手は熱可塑性樹脂（ポリエチレン樹脂やポリブテン
樹脂等）からなる継手本体１、詳しくはインナーと呼ば
れる内筒部材１ａにアウターと呼ばれる外筒部材１ｂを
一体的に射出成形して形成したものである。内周面には
インナーに形成した螺施溝に巻いて設けた電熱線３が埋
設され、その両端はそれぞれコネクターピン２に接続さ
れている。融着作業は、この継手内にパイプ４を挿入
し、両端のコネクターピン２にコントローラ側の通電端
子（図示せず）を接続し、その後、定められた電気エネ
ルギーを供給して電熱線３の発熱作用によって継手とパ
イプを融着接続するものである。2. Description of the Related Art Conventionally, as a connection structure between a heating wire and a connector pin of an electric fusion type plastic pipe joint (hereinafter sometimes referred to as an electric fusion joint), Japanese Utility Model Publication No. 5-20957.
There is one disclosed in FIG. 3 and shown in FIG. This electrofusion type joint is formed by integrally injection-molding a joint body 1 made of a thermoplastic resin (polyethylene resin, polybutene resin, etc.), specifically, an outer cylinder member 1b called outer with an inner cylinder member 1a called inner. It was done. A heating wire 3 wound around a threaded groove formed on the inner surface is embedded in the inner peripheral surface, and both ends thereof are connected to connector pins 2 respectively. In the fusing operation, a pipe 4 is inserted into the joint, an energizing terminal (not shown) on the controller side is connected to the connector pins 2 at both ends, and then predetermined electric energy is supplied to the heating wire 3 The joint and the pipe are fusion-spliced by the heat generation action.
【０００３】ところで、従来この継手で採られてきた電
熱線３とコネクターピン２との接続構造としては、コネ
クターピン２の下部に上下対向して設けたフランジ状の
つば２１，２２を設け（図３参照）、この間に電熱線３
を巻き付け、その後つば２１，２２同士を圧着する、い
わゆるカシメ手段によって接続する構造がある。また、
単にコネクターピンに電熱線を巻き付けて接続するとい
う構造もとられている。As a connection structure between the heating wire 3 and the connector pin 2 which has been conventionally adopted by this joint, flange-shaped flanges 21 and 22 are provided below the connector pin 2 so as to be vertically opposed (see FIG. 1). 3), heating wire 3
Is wound, and then the collars 21 and 22 are connected to each other by so-called caulking means. Also,
There is a structure in which a heating wire is simply wound around the connector pins and connected.
【０００４】[0004]
【発明が解決しようとする課題】ところが、上記のうち
前者のものでは、カシメ作業自体は人手に頼らざるを得
ないところがあり、一連の製造過程の全自動化が困難で
あるという問題がある。また、後者のものでは、上記よ
りも自動化はし易いが、接触通電不良を起こし易いとい
う問題がある。すなわち、ここでの電熱線は、通常銅合
金系の抵抗加熱線が使用されているが、融着に必要なイ
ンプットエネルギーの比較的少ない小口径サイズ（７５
Ａ以下）では、その線径は比較的細くφ１．０ｍｍ以下
で足りる。しかし自動化の際には、電熱線に引張り荷重
を加えながらコネクターピンに巻き付けるので、電熱線
がコネクターピンのつばとつばの間から外れたり、ある
いは電熱線が団子状にコネクターピンに巻き付いてしま
い、ピンとの接触面積が十分にとれずに通電不良を起こ
してしまう問題がある。さらに大口径サイズ（１００Ａ
以上）になると総融着面積が格段にアップすることとな
り単位面積当たりのインプットエネルギーが不足する。
そのため、線径をφ１．０〜φ２．０ｍｍ前後まで太く
する必要がある。しかし、これだけ太くなると巻き付け
張力が増大するし、ますます電熱線がコネクターピンの
つばとつばの間から外れて通電不良を起こしたり、接続
強度不足を招くという問題がある。However, in the former of the above, there is a problem that the caulking operation itself has to rely on manual labor, and it is difficult to fully automate a series of manufacturing processes. In the latter case, although automation is easier than the above, there is a problem that a contact energization failure is apt to occur. That is, although a copper alloy-based resistance heating wire is usually used as the heating wire here, a small-diameter size (75 mm) that requires relatively little input energy for fusion is used.
A or less), the wire diameter is relatively small, and φ1.0 mm or less is sufficient. However, at the time of automation, the heating wire is wound around the connector pin while applying a tensile load, so the heating wire comes off from the brim of the connector pin, or the heating wire winds around the connector pin in a dumpling, There is a problem in that the contact area with the pin cannot be sufficiently obtained, resulting in an energization failure. Larger size (100A
Above), the total fused area is significantly increased, and the input energy per unit area is insufficient.
Therefore, it is necessary to increase the wire diameter to about φ1.0 to φ2.0 mm. However, when the wire is thicker, the winding tension increases, and there is a problem that the heating wire is more and more removed from between the flanges of the connector pins, resulting in poor current supply and insufficient connection strength.
【０００５】本発明は上記の問題を解決するもので、電
気融着継手に使用される電熱線をコネクターピンに接触
通電不良を生じさせないで確実に接続する構造を有し、
特に巻線工程を含む一連の製造工程が自動化し易い電気
融着式プラスチック管継手を提供することを目的とす
る。The present invention solves the above-mentioned problem, and has a structure for reliably connecting a heating wire used for an electric fusion joint to a connector pin without causing poor contact current.
In particular, it is an object of the present invention to provide an electrofusion-type plastic pipe joint in which a series of manufacturing steps including a winding step can be easily automated.
【０００６】[0006]
【課題を解決するための手段】本発明は、プラスチック
管継手本体と、この管継手本体に埋設した電熱線と、こ
の電熱線の両端に接続したコネクターピンとからなる電
気融着式プラスチック管継手において、前記コネクター
ピンに前記電熱線を巻き付ける巻付け部を設け、前記巻
付け部の片端に電熱線の巻き始めの電熱線を係止する溝
と、前記巻付け部の他端に電熱線の巻き終わりに電熱線
を係止する溝を設け、電熱線とコネクターピンを接続し
た電気融着式プラスチック管継手である。SUMMARY OF THE INVENTION The present invention relates to an electric fusion-type plastic pipe joint comprising a plastic pipe joint body, a heating wire embedded in the pipe joint body, and connector pins connected to both ends of the heating wire. A winding portion for winding the heating wire around the connector pin, a groove for locking the heating wire at the beginning of the heating wire at one end of the winding portion, and a heating wire winding at the other end of the winding portion. At the end, a groove for retaining the heating wire is provided, and this is an electrofusion type plastic pipe joint in which the heating wire and the connector pin are connected.
【０００７】[0007]
【作用】電熱線の巻き始めにおいて、電熱線に引張り荷
重を加えながらコネクターピンの巻付け部下方の溝に電
熱線を挟み込み、その後、電熱線をコネクターピンの巻
付け部の外周面に巻き上げながら、最終的に巻き終わり
ではコネクターピンの巻付け部上方の溝に電熱線を挟み
込む。このとき電熱線の線径に比較して、溝の幅が僅か
ながら小さい寸法であるため、溝の側壁と側壁の隙間に
電熱線が挟み込まれて、しまりばめ状態で圧入され、且
つ少なくとも上下２個所の溝には電熱線が係止されるた
め、電熱線がコネクターピンから外れて接触通電不良を
起こす問題がなくなる。[Action] At the beginning of winding of the heating wire, the heating wire is inserted into the groove below the winding portion of the connector pin while applying a tensile load to the heating wire, and then the heating wire is wound around the outer peripheral surface of the winding portion of the connector pin. Finally, at the end of the winding, the heating wire is inserted into the groove above the winding portion of the connector pin. At this time, since the width of the groove is slightly smaller than the wire diameter of the heating wire, the heating wire is sandwiched in the gap between the side walls of the groove and is press-fitted in a tightly fitted state, and at least up and down. Since the heating wire is locked in the two grooves, there is no problem that the heating wire is detached from the connector pin and the contact conduction failure occurs.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施例を図面を参
照して説明する。図１は一実施例を示すコネクターピン
の接続構造を示す正面図、図２は図１のコネクターピン
に電熱線を巻付けた状態を示す正面図である。電気融着
継手本体などの構成は従来と変るところがないので説明
は省略する。コネクターピン５は銅合金からなり、上部
に継手本体外面より突出し、別置電源コントローラ側の
凹端子を差し込む凸端子部５１と、下部に内筒部材１ａ
の穴に嵌めて位置決めし埋設する突起部５２を有し、そ
の間にフランジ状のつば５３，５４が対向して設けられ
ている。両つば５３，５４の間には、電熱線３を数回巻
き付ける巻付け部５５があり、さらに巻付け部５５の両
端、本実施例では上方と下方の２個所に電熱線３を挟み
込むための溝５６，５７を設ける。これらの溝５６，５
７の幅は、電熱線３が嵌まり込む程度の寸法、または電
熱線３の線径に比較して僅かながら小さい寸法、例えば
０．０３mm程度小さく形成されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a connector pin connection structure showing one embodiment, and FIG. 2 is a front view showing a state where a heating wire is wound around the connector pin of FIG. Since the configuration of the electrofusion joint main body and the like is the same as the conventional one, the description is omitted. The connector pin 5 is made of a copper alloy, protrudes from the outer surface of the joint main body at the upper part, and has a convex terminal part 51 into which a concave terminal on the side of the separately installed power controller is inserted, and an inner cylindrical member 1a at the lower part.
And a projection 52 to be fitted and positioned and embedded in the hole, and flange-shaped flanges 53 and 54 are provided to face each other. A winding portion 55 for winding the heating wire 3 several times is provided between the two flanges 53 and 54. Further, the heating wire 3 is sandwiched between both ends of the winding portion 55, in the present embodiment, two places, upper and lower. Grooves 56 and 57 are provided. These grooves 56, 5
The width of the wire 7 is small enough to fit the heating wire 3 or slightly smaller than the wire diameter of the heating wire 3, for example, about 0.03 mm.
【０００９】電熱線３の巻き始めは、引張り荷重を加え
ながらコネクターピン５の溝５６に電熱線３を挟み込ん
で係止し、その後、電熱線３をコネクターピン５の巻付
け部５５の外周面に数回巻き上げ、最終的に巻き終わり
ではコネクターピン５の溝５７に電熱線３の末端をしま
りばめの状態で挟み込んで係止する。At the beginning of the winding of the heating wire 3, the heating wire 3 is sandwiched and locked in the groove 56 of the connector pin 5 while applying a tensile load, and then the heating wire 3 is connected to the outer peripheral surface of the winding portion 55 of the connector pin 5. Finally, at the end of the winding, the end of the heating wire 3 is inserted into the groove 57 of the connector pin 5 with a tight fit and locked.
【００１０】[0010]
【発明の効果】以上の説明のごとく、電熱線がコネクタ
ーピンの巻付け部に巻き付けられ、且つ２個所の溝を介
して係止され圧入接続可能となるため、巻線工程を含む
一連の製造工程が自動化し易く、自動巻線機で電熱線を
コネクターピンに容易に且つ確実に接続が行えるため、
信頼性の高い電熱線とコネクターピンの接続構造を備え
た電気融着式プラスチック管継手となる。As described above, since the heating wire is wound around the winding portion of the connector pin and is locked via two grooves to enable press-fitting connection, a series of manufacturing steps including a winding step are performed. Since the process is easy to automate and the heating wire can be easily and reliably connected to the connector pins by the automatic winding machine,
This is an electro-fusion type plastic pipe joint that has a highly reliable connection structure between a heating wire and a connector pin.
【図１】 本発明の実施例を示すコネクターピンの接続
構造を示す正面図である。FIG. 1 is a front view showing a connector pin connection structure according to an embodiment of the present invention.
【図２】 本発明の実施例を示す電熱線を巻き付けたコ
ネクターピンの正面図である。FIG. 2 is a front view of a connector pin around which a heating wire according to the embodiment of the present invention is wound.
【図３】 従来例を示す電熱線とコネクターピンの接続
構造の断面図である。FIG. 3 is a cross-sectional view of a connection structure between a heating wire and a connector pin, showing a conventional example.
１…継手本体， １ａ…内筒部材 １ｂ…外筒部材， ２…コネクターピン ３…電熱線， ４…パイプ ５…コネクターピン ５１…凸端子部 ５２…突起部， ５３，５４…フラン
ジ状つば ５５…巻付け部， ５６，５７…溝DESCRIPTION OF SYMBOLS 1 ... Joint main body, 1a ... Inner cylinder member 1b ... Outer cylinder member, 2 ... Connector pin 3 ... Heating wire, 4 ... Pipe 5 ... Connector pin 51 ... Convex terminal part 52 ... Projection part, 53, 54 ... Flange flange 55 ... wrapped part, 56, 57 ... groove
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池田 潔 三重県桑名市大福２番地日立金属株式会社 桑名工場内 (72)発明者 川添 敏弘 三重県桑名市大字増田498−１扶桑工機株 式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Ikeda 2 Daifuku, Kuwana-shi, Mie Hitachi Metals Co., Ltd. Kuwana Plant (72) Inventor Toshihiro Kawazoe 498-1, Ota Masuda, Kuwana-shi, Mie Fuso Koki Co., Ltd. Inside
Claims (1)
本体に埋設した電熱線と、この電熱線の両端に接続した
コネクターピンとからなる電気融着式プラスチック管継
手において、 前記コネクターピンに前記電熱線を巻き付ける巻付け部
を設け、前記巻付け部の片端に電熱線の巻き始めの電熱
線を係止する溝と、前記巻付け部の他端に電熱線の巻き
終わりに電熱線を係止する溝を設け、電熱線とコネクタ
ーピンを接続したことを特徴とする電気融着式プラスチ
ック管継手。1. An electric fusion-type plastic pipe joint comprising: a plastic pipe joint body; a heating wire embedded in the pipe joint body; and connector pins connected to both ends of the heating wire. A winding portion for winding the heating wire at one end of the winding portion, and a heating wire at the other end of the winding portion at the end of the heating wire at the other end of the winding portion. An electrofusion type plastic pipe joint characterized by having a groove and connecting a heating wire and a connector pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8178352A JPH1026284A (en) | 1996-07-08 | 1996-07-08 | Electrical fusion type plastic pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8178352A JPH1026284A (en) | 1996-07-08 | 1996-07-08 | Electrical fusion type plastic pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1026284A true JPH1026284A (en) | 1998-01-27 |
Family
ID=16046996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8178352A Pending JPH1026284A (en) | 1996-07-08 | 1996-07-08 | Electrical fusion type plastic pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1026284A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108591660A (en) * | 2018-05-16 | 2018-09-28 | 宁波恒元精工管阀科技有限公司 | Wiring terminal of electric melting pipe |
| KR20190115610A (en) * | 2018-04-03 | 2019-10-14 | 양성훈 | Pipe freezing prevention apparatus |
-
1996
- 1996-07-08 JP JP8178352A patent/JPH1026284A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190115610A (en) * | 2018-04-03 | 2019-10-14 | 양성훈 | Pipe freezing prevention apparatus |
| CN108591660A (en) * | 2018-05-16 | 2018-09-28 | 宁波恒元精工管阀科技有限公司 | Wiring terminal of electric melting pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5697143A (en) | Method of manufacturing an electrofusion coupler | |
| US5369248A (en) | Electro-weldable connecting piece having connection terminals and its method of manufacture | |
| JPH1026284A (en) | Electrical fusion type plastic pipe joint | |
| JPH0731036Y2 (en) | Welding joint | |
| US6236026B1 (en) | Device for welding an accessory on a pipe by means of electrical heating elements integrated in said accessory | |
| JPH11118085A (en) | Electrical welding coupling | |
| JPH10220676A (en) | Electrically fused joint for synthetic resin pipe | |
| JP3495064B2 (en) | CONNECTION DEVICE AND ITS MANUFACTURING METHOD | |
| JP3060684B2 (en) | solenoid | |
| JPH11325368A (en) | Electrically fused pipe joint | |
| JP4482868B2 (en) | Electric fusion-type resin pipe joint and method for manufacturing the same | |
| JP3045824B2 (en) | Manufacturing method of electric fusion joint | |
| JPH0727282A (en) | Electro-fusion joint and its forming method | |
| CN210484958U (en) | Induction hot melt pipe connector | |
| JPH079559A (en) | Manufacture of electric fusion-bonding plastic tube joint | |
| JPH11280978A (en) | Electric fusion coupling | |
| JPH10311480A (en) | Flange joint for synthetic resin pipe | |
| JPH0520957Y2 (en) | ||
| JP2721449B2 (en) | Electric fusion plastic pipe fittings | |
| JPH11141789A (en) | Method for attaching terminal pin | |
| JPH10274379A (en) | Electric welding type plastic pipe joint and manufacture thereof | |
| JP3599918B2 (en) | Heating wire connection method | |
| JP2000234690A (en) | Electrofusion type plastic tube coupling | |
| JPH0648237Y2 (en) | Welding joint | |
| JP2002257284A (en) | Electrically fusing joint |