JP3599918B2 - Heating wire connection method - Google Patents

Heating wire connection method Download PDF

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Publication number
JP3599918B2
JP3599918B2 JP26570096A JP26570096A JP3599918B2 JP 3599918 B2 JP3599918 B2 JP 3599918B2 JP 26570096 A JP26570096 A JP 26570096A JP 26570096 A JP26570096 A JP 26570096A JP 3599918 B2 JP3599918 B2 JP 3599918B2
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Japan
Prior art keywords
heating wire
locking groove
terminal pin
wound
flanges
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Expired - Lifetime
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JP26570096A
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Japanese (ja)
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JPH10110884A (en
Inventor
一徳 梅田
山本　　誠
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Mitsubishi Plastics Inc
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Mitsubishi Plastics Inc
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Priority to JP26570096A priority Critical patent/JP3599918B2/en
Publication of JPH10110884A publication Critical patent/JPH10110884A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • 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
    • 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
    • B29C66/01—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、電熱線の端部を端子ピンに簡単かつ確実に固定できる電熱線の接続方法に関する。
【０００２】
【従来の技術】
従来からガス管や給水・給湯管等の合成樹脂管の接続には、合成樹脂からなる継手本体の両端に受口を設け、それぞれの受口内周面に電熱線を埋設した電気融着継手が使用されている。例えば、図６に要部断面図で示した如く、ポリエチレン等からなる筒体１ａの外周面に螺旋溝１１ａを刻設すると共にその端部に端子ピン２ａを立設し、螺旋溝１１ａに巻回した電熱線３ａの端部を端子ピン２ａに固定してから、筒体１ａの外周面に合成樹脂層１ｂを一体的に設けた電気融着継手が用いられている。
【０００３】
【発明が解決しようとする課題】
ところが、この従来継手の場合には、電熱線３ａの端部が端子ピン２ａに強固に固定されず、鍔２１ａ，２ａの間に巻き込んだ電熱線３ａが緩むことがあった。このため、端子ピン２ａと電熱線３ａとの間に接点不良が発生し、端子ピン２ａに電源を接続して電熱線３ａに通電したとき、電熱線３ａの発熱不良によって継手の受口に挿入した合成樹脂管Ｐが完全に融着接合しないという問題があった。
【０００４】
本発明はかかる課題を解決したものであって、電熱線の端部を端子ピンに簡単かつ確実に固定できると共に、強固な融着接合が得られる電熱線の接続方法を提供するものである。
【０００５】
【課題を解決するための手段】
本発明は、熱可塑性樹脂製筒体の外周面に突設した端子ピンに複数の鍔を設けると共に、各鍔の間に形成した係止溝に電熱線を巻回して接続するにあたり、複数の鍔によって少なくとも３条の係止溝を形成すると共に、各係止溝の幅を電熱線の線径よりも若干狭幅に形成し、まず端子ピンの基部側に位置する係止溝に電熱線を巻き込み、次に電熱線を飛ばして端子ピンの先端側に位置する係止溝に電熱線を巻き込み、しかる後順次基部側に位置する係止溝に電熱線を巻き込むことを特徴とする。
【０００６】
【発明の実施の形態】
以下、本発明の実施例を図面にて詳細に説明する。
図１は熱可塑性樹脂製筒体の端部外周面に端子ピンを突設した予備成形体の断面図、図２は端子ピンの基部側に位置する係止溝に電熱線を巻き込む工程の要部概略図、図３は電熱線を飛ばして端子ピンの先端側に位置する係止溝に電熱線を巻き込む工程の要部概略図、図４は電熱線を中間の係止溝に巻き込む工程の要部概略図、図５は金型内で射出成形する工程の要部断面図であって、図中の符号１はポリエチレン、ポリブテン等の熱可塑性樹脂からなる筒体、２は端子ピン、３はニクロム線等の電熱線である。
【０００７】
筒体１の外周面には螺旋状の溝１１が連続して刻設されており、筒体１の両端部外周には一対の端子ピン２が突出して設けられている。端子ピン２には複数のフランジ状の鍔２１が設けられており、各鍔２１によって３条の係止溝２２が設けられている。そして、各係止溝２２の幅は電熱線３の線径よりも若干狭幅に形成されている。一般に、この予備成形体は射出成形によって一体的に製造されるものである。
【０００８】
本発明では、まず一方の端子ピン２に電熱線３の端部を固定する。このとき、図２に示した如く、電熱線３をガイドローラ５に挿通し、電熱線３の端部をクランプ４で保持する。そこで、電熱線３に一定のテンションを付与しつつガイドローラ５を鍔２１の外周に添わせて回転させ、まず最初に端子ピン２の基部側に位置する係止溝２２に電熱線３をほぼ一回転させて巻き込む。次に、図３に示した如く、電熱線３を飛ばして端子ピン２の先端側に位置する係止溝２２に電熱線３をほぼ一回転させて巻き込む。すると、上下の係止溝２２に電熱線３が嵌入すると共に各鍔２１が若干外側に反るため、中間の係止溝２２が若干狭幅となる。
【０００９】
そこで、最後に図４に示した如く、中間に位置する係止溝２２に電熱線３を巻き込む。この中間の係止溝２２の幅は電熱線３の線径よりも若干狭幅に縮小されているため、該係止溝２２に電熱線３が嵌まり込むと、この係止溝２２の幅が拡張する。この結果、上下の係止溝２２に巻き込まれた各電熱線３は鍔２１、２１間で押圧されて強固に保持される。
【００１０】
また、前述した電熱線３の巻き込み操作は、ガイドローラ５を鍔２１の外周に添わせて回転させつつ電熱線３にテンションを付与するので、端子ピン２が折れ曲がったりすることもない。また、端子ピン２の先端側の係止溝２２に電熱線３を巻き込んでから、次に中間に位置する係止溝２２に電熱線３を巻き込むので、鍔２１の外周に添わせてガイドローラ５を回転させたとき、クランプ４で保持された電熱線３の端部が邪魔になることもない。
【００１１】
図４に示した如く、一方の端子ピン２に電熱線３の端部を接続してから、電熱線３の先端を図示したＣの位置でカットし、筒体１の外周面に刻設された螺旋状の溝１１に沿って電熱線３を巻回する。そして、他方の端子ピン２に電熱線３の他端を固定する。このとき、前記同様にして、まず最初に端子ピン２の基部側に位置する係止溝２２に電熱線３を巻き込み、次に電熱線３を飛ばして端子ピン２の先端側に位置する係止溝２２に巻き込み、最後に中間に位置する係止溝２２に電熱線３を巻き込むと、強固に固定される。
【００１２】
そこで、図５に示した如く、電熱線３が巻回された筒体１にマンドレル６を挿入して金型７内にセットし、キャビテイ内に溶融樹脂を射出すると、所望の電気融着継手が得られる。
【００１３】
尚、前述した実施例では、複数の鍔によって３条の係止溝を設けたものを例示したが、本発明はこの構成に限定されない。係止溝は４条以上設けることもでき、この場合も前記同様に、まず最初に端子ピンの基部側に位置する係止溝に電熱線を巻き込み、次に電熱線を飛ばして端子ピンの先端側に位置する係止溝に巻き込み、しかる後順次基部側に位置する係止溝に巻き込むようにすればよい。
【００１４】
【発明の効果】
以上詳述した如く、本発明は端子ピンに複数の鍔を設けることによって少なくとも３条の係止溝を形成し、最初に端子ピンの基部側に位置する係止溝に電熱線を巻き込み、次に電熱線を飛ばして端子ピンの先端側に位置する係止溝に電熱線を巻き込み、しかる後順次基部側に位置する係止溝に電熱線を巻き込むので、電熱線を端子ピンの周りで回転させる巻き込み操作が簡単に行なえる。
【００１５】
また、本発明は、各係止溝の幅を電熱線の線径よりも若干狭幅に形成したので、係止溝に巻き込まれた電熱線は鍔の間で挟圧されて強固に固定される。このため、端子ピンと電熱線との間で接点不良が発生することがなく、強固な融着接合が得られる。
【図面の簡単な説明】
【図１】図１は熱可塑性樹脂製筒体の端部外周面に端子ピンを突設した予備成形体の断面図である。
【図２】図２は端子ピンの基部側に位置する係止溝に電熱線を巻き込む工程の要部概略図である。
【図３】図３は電熱線を飛ばして端子ピンの先端側に位置する係止溝に電熱線を巻き込む工程の要部概略図である。
【図４】図４は電熱線を中間の係止溝に巻き込む工程の要部概略図である。
【図５】図５は金型内で射出成形する工程の要部断面図である。
【図６】図６は従来の電気融着継手を示す要部断面図である。
【符号の説明】
１ 熱可塑性樹脂製筒体
２ 端子ピン
３ 電熱線
１１ 螺旋状の溝
２１ 鍔
２２ 係止溝[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heating wire connection method that can easily and reliably fix an end of a heating wire to a terminal pin.
[0002]
[Prior art]
Conventionally, for the connection of synthetic resin pipes such as gas pipes and water / hot water supply pipes, sockets are provided at both ends of a joint body made of synthetic resin, and electric fusion joints with heating wires embedded on the inner peripheral surface of each socket are used. It is used. For example, as shown in a sectional view of a main part in FIG. 6, a spiral groove 11a is formed on the outer peripheral surface of a cylindrical body 1a made of polyethylene or the like, and a terminal pin 2a is erected at the end thereof, and the spiral groove 11a is wound around the spiral groove 11a. An electric fusion joint is used in which an end of the turned heating wire 3a is fixed to the terminal pin 2a, and then a synthetic resin layer 1b is integrally provided on the outer peripheral surface of the cylindrical body 1a.
[0003]
[Problems to be solved by the invention]
However, in the case of this conventional joint, the end of the heating wire 3a was not firmly fixed to the terminal pin 2a, and the heating wire 3a wound between the flanges 21a, 2a was sometimes loosened. For this reason, a contact failure occurs between the terminal pin 2a and the heating wire 3a, and when a power supply is connected to the terminal pin 2a and the heating wire 3a is energized, the terminal pin 2a is inserted into the socket of the joint due to poor heating of the heating wire 3a. There is a problem that the synthetic resin pipe P thus obtained is not completely fused and joined.
[0004]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and it is an object of the present invention to provide a method of connecting a heating wire in which an end portion of the heating wire can be easily and reliably fixed to a terminal pin, and strong fusion bonding can be obtained.
[0005]
[Means for Solving the Problems]
The present invention provides a plurality of flanges on a terminal pin protruding from an outer peripheral surface of a thermoplastic resin cylindrical body, and, when winding and connecting a heating wire to a locking groove formed between the flanges, a plurality of flanges. At least three locking grooves are formed by the flanges, and the width of each locking groove is formed to be slightly smaller than the wire diameter of the heating wire. First, the heating groove is formed in the locking groove located on the base side of the terminal pin. Then, the heating wire is skipped, and the heating wire is wound into the locking groove located on the tip side of the terminal pin, and then the heating wire is sequentially wound into the locking groove located on the base side.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a preform having a terminal pin protruding from an outer peripheral surface of an end portion of a thermoplastic resin cylinder. FIG. 2 is a diagram showing a main step of winding a heating wire into a locking groove located on a base side of the terminal pin. FIG. 3 is a schematic view of a main part of a process in which a heating wire is skipped and a heating wire is wound into a locking groove located on the tip end side of a terminal pin, and FIG. 4 is a schematic view of a process in which the heating wire is wound into an intermediate locking groove. FIG. 5 is a schematic cross-sectional view of a main part of a step of injection molding in a mold. In FIG. 5, reference numeral 1 denotes a cylindrical body made of a thermoplastic resin such as polyethylene or polybutene; Is a heating wire such as a nichrome wire.
[0007]
A spiral groove 11 is continuously engraved on the outer peripheral surface of the cylindrical body 1, and a pair of terminal pins 2 are provided to protrude on the outer circumference of both ends of the cylindrical body 1. The terminal pin 2 is provided with a plurality of flange-shaped flanges 21, and each flange 21 provides three locking grooves 22. The width of each locking groove 22 is formed to be slightly smaller than the diameter of the heating wire 3. Generally, this preform is manufactured integrally by injection molding.
[0008]
In the present invention, first, the end of the heating wire 3 is fixed to one terminal pin 2. At this time, as shown in FIG. 2, the heating wire 3 is inserted into the guide roller 5, and the end of the heating wire 3 is held by the clamp 4. Then, the guide roller 5 is rotated along with the outer periphery of the flange 21 while applying a certain tension to the heating wire 3, and first the heating wire 3 is substantially inserted into the locking groove 22 located on the base side of the terminal pin 2. Make one turn and get involved. Next, as shown in FIG. 3, the heating wire 3 is skipped, and the heating wire 3 is wound around the locking groove 22 located at the tip end side of the terminal pin 2 by substantially one rotation. Then, the heating wire 3 fits into the upper and lower locking grooves 22 and the respective flanges 21 slightly warp outward, so that the width of the intermediate locking groove 22 becomes slightly narrower.
[0009]
Then, finally, as shown in FIG. 4, the heating wire 3 is wound into the locking groove 22 located in the middle. Since the width of the intermediate locking groove 22 is slightly smaller than the wire diameter of the heating wire 3, when the heating wire 3 is fitted into the locking groove 22, the width of the locking groove 22 is reduced. Expands. As a result, each heating wire 3 caught in the upper and lower locking grooves 22 is pressed between the flanges 21 and 21 and is held firmly.
[0010]
In addition, the above-described operation of winding the heating wire 3 applies tension to the heating wire 3 while rotating the guide roller 5 along the outer periphery of the flange 21, so that the terminal pin 2 does not bend. Further, since the heating wire 3 is wound into the locking groove 22 on the distal end side of the terminal pin 2 and then the heating wire 3 is wound into the locking groove 22 located in the middle, the guide roller is provided along the outer periphery of the flange 21. When rotating 5, the end of the heating wire 3 held by the clamp 4 does not become an obstacle.
[0011]
As shown in FIG. 4, after connecting the end of the heating wire 3 to one terminal pin 2, the tip of the heating wire 3 is cut at a position C shown in the drawing, and is cut into the outer peripheral surface of the cylindrical body 1. The heating wire 3 is wound along the spiral groove 11. Then, the other end of the heating wire 3 is fixed to the other terminal pin 2. At this time, in the same manner as described above, first, the heating wire 3 is first wound into the locking groove 22 located on the base side of the terminal pin 2, and then the heating wire 3 is skipped to stop the locking located on the tip side of the terminal pin 2. When the heating wire 3 is wound into the groove 22 and finally the heating wire 3 is wound into the locking groove 22 located in the middle, it is firmly fixed.
[0012]
Therefore, as shown in FIG. 5, the mandrel 6 is inserted into the cylindrical body 1 around which the heating wire 3 is wound, set in the mold 7, and the molten resin is injected into the cavity. Is obtained.
[0013]
In the above-described embodiment, an example in which three locking grooves are provided by a plurality of flanges is illustrated, but the present invention is not limited to this configuration. Four or more locking grooves can be provided. In this case, similarly to the above, firstly, the heating wire is first wound into the locking groove located on the base side of the terminal pin, and then the heating wire is skipped to remove the tip of the terminal pin. It is sufficient to wind into the locking groove located on the side and then sequentially wind into the locking groove located on the base side.
[0014]
【The invention's effect】
As described in detail above, the present invention forms at least three locking grooves by providing a plurality of flanges on the terminal pin, first winds a heating wire into the locking groove located on the base side of the terminal pin, The heating wire is wound into the locking groove located on the tip side of the terminal pin, and then the heating wire is sequentially wound into the locking groove located on the base side, so the heating wire is rotated around the terminal pin Engaging operation can be easily performed.
[0015]
Further, in the present invention, since the width of each locking groove is formed to be slightly smaller than the wire diameter of the heating wire, the heating wire entrained in the locking groove is firmly fixed by being pressed between the flanges. You. For this reason, a contact failure does not occur between the terminal pin and the heating wire, and a strong fusion bonding can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a preform having a terminal pin protruding from an outer peripheral surface of an end portion of a thermoplastic resin tubular body.
FIG. 2 is a schematic view of a main part of a step of winding a heating wire into a locking groove located on a base side of a terminal pin.
FIG. 3 is a schematic view of a main part of a process of skipping a heating wire and winding the heating wire into a locking groove located at a tip end side of a terminal pin.
FIG. 4 is a schematic view of a main part of a step of winding a heating wire into an intermediate locking groove.
FIG. 5 is a cross-sectional view of a main part of a step of performing injection molding in a mold.
FIG. 6 is a sectional view of a main part showing a conventional electric fusion joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Thermoplastic resin cylinder 2 Terminal pin 3 Heating wire 11 Spiral groove 21 Flange 22 Locking groove

Claims (1)

熱可塑性樹脂製筒体の外周面に突設した端子ピンに複数の鍔を設けると共に、各鍔の間に形成した係止溝に電熱線を巻回して接続するにあたり、複数の鍔によって少なくとも３条の係止溝を形成すると共に、各係止溝の幅を電熱線の線径よりも若干狭幅に形成し、まず端子ピンの基部側に位置する係止溝に電熱線を巻き込み、次に電熱線を飛ばして端子ピンの先端側に位置する係止溝に電熱線を巻き込み、しかる後順次基部側に位置する係止溝に電熱線を巻き込むことを特徴とする電熱線の接続方法。A plurality of flanges are provided on the terminal pins protruding from the outer peripheral surface of the thermoplastic resin cylinder, and at least three flanges are used to wind and connect the heating wire to the locking grooves formed between the flanges. In addition to forming the locking groove of the strip, the width of each locking groove is formed to be slightly smaller than the wire diameter of the heating wire, the heating wire is first wound into the locking groove located at the base side of the terminal pin, and then the A heating wire is wound into a locking groove located on the distal end side of the terminal pin, and then the heating wire is sequentially wound into a locking groove located on the base side.
JP26570096A 1996-10-07 1996-10-07 Heating wire connection method Expired - Lifetime JP3599918B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26570096A JP3599918B2 (en) 1996-10-07 1996-10-07 Heating wire connection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26570096A JP3599918B2 (en) 1996-10-07 1996-10-07 Heating wire connection method

Publications (2)

Publication Number Publication Date
JPH10110884A JPH10110884A (en) 1998-04-28
JP3599918B2 true JP3599918B2 (en) 2004-12-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP26570096A Expired - Lifetime JP3599918B2 (en) 1996-10-07 1996-10-07 Heating wire connection method

Country Status (1)

Country Link
JP (1) JP3599918B2 (en)

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JPH10110884A (en) 1998-04-28

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