JP3571763B2 - Electric welding branch pipe joint - Google Patents

Electric welding branch pipe joint Download PDF

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Publication number
JP3571763B2
JP3571763B2 JP17703794A JP17703794A JP3571763B2 JP 3571763 B2 JP3571763 B2 JP 3571763B2 JP 17703794 A JP17703794 A JP 17703794A JP 17703794 A JP17703794 A JP 17703794A JP 3571763 B2 JP3571763 B2 JP 3571763B2
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JP
Japan
Prior art keywords
branch pipe
heating wire
peripheral end
saddle
pipe joint
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
JP17703794A
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Japanese (ja)
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JPH0842775A (en
Inventor
忠雄 安藤
一徳 梅田
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Mitsubishi Plastics Inc
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Mitsubishi Plastics Inc
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Filing date
Publication date
Application filed by Mitsubishi Plastics Inc filed Critical Mitsubishi Plastics Inc
Priority to JP17703794A priority Critical patent/JP3571763B2/en
Publication of JPH0842775A publication Critical patent/JPH0842775A/en
Application granted granted Critical
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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
    • B29C66/50—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
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B29C66/52241—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-shaped pieces
    • 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"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Landscapes

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

Description

【０００１】
【産業上の利用分野】
本発明は、略半円弧状に湾曲したサドルの上面から枝管が一体的に突出し、またサドルの裏面に電熱線が所定間隔で渦巻状に埋設された電気融着用分岐管継手に関する。
【０００２】
【従来の技術】
一般に、この種の電気融着用分岐管継手は、合成樹脂シートの片面に渦巻状の溝を設け、該溝に沿って電熱線を嵌合させた電熱マットを金型内にセットしてからキャビテイ内に溶融樹脂を射出成形している。
【０００３】
【発明が解決しようとする課題】
ところが、この射出成形の際に渦巻線の内周端から引き出した電熱線と溝からはみ出した電熱線とが接触したり、電熱線を発熱させてときに樹脂が溶融して隣接する電熱線同志が接触することがあった。この様にして電熱線同志が接触すると、通電したとき接触部が異常発熱して融着不良が発生することがあった。
【０００４】
本発明はかかる課題を解決したものであって、電熱線同志が接触して融着不良が発生することのない電気融着用分岐管継手を提供する。
【０００５】
【課題を解決するための手段】
本発明の電気融着用分岐管継手は、略半円弧状に湾曲したサドルの上面に枝管を一体的に突設し、またサドルの裏面に枝管と連通する孔を中心として電熱線を所定間隔で渦巻状に埋設すると共に、該渦巻線の内周端及び外周端から引き出した電熱線の端部に端子ピンを接続してそれぞれの端子ピンをサドルの上面に設けたプラグ内に立設したものである。そして、渦巻線の内周端から引き出した電熱線をサドルの上面に沿わせて外周側に引き出すと共に、その端部に接続した端子ピンを外周端から引き出した電熱線の端子ピンよりも上方に立ち上げたことを特徴とする。
【０００６】
【作用】
渦巻状に巻回した電熱線と、該渦巻線の内周端から引き出した電熱線とが離隔した状態で埋設されるので、電熱線同志が接触しない。
【０００７】
【実施例】
以下、本発明の実施例を図面にて詳細に説明する。
図１は本発明で用いられる電熱マットの一実施例を示す平面図、図２は電熱マットを金型内にセットした状態の断面図、図３は図２のＸーＸ線断面図、図４は本発明の電気融着用分岐管継手を示す断面図であって、図中１は合成樹脂シート、２は電熱線、３は電気融着用分岐管継手である。
【０００８】
本発明の電気融着用分岐管継手３は、図４に示した如く略半円弧状に湾曲したサドル３１の上面に枝管３２を一体的に突設し、またサドル３１の裏面に枝管３２と連通する孔３３を中心として電熱線２を渦巻状に埋設したものである。
【０００９】
また、渦巻線の内周端及び外周端から引き出した電熱線２の端部には端子ピン２１が接続しており、それぞれの端子ピン２１がサドル３１の上面に設けたプラグ３４内に設けられている。そして、渦巻線の内周端から引き出された電熱線２はサドル３１の上面に沿って外周側に引き出され、その端部に接続した端子ピン２１が外周端から引き出した電熱線２の端子ピン２１よりも上方に立ち上げられている。
【００１０】
この電気融着用分岐管継手３の製造工程は、電熱マット１ａの成形工程と、該電熱マット１ａを金型内にセットしてから溶融樹脂を射出する成形工程とからなっている。まず最初の電熱マット１ａの成形工程では、ポリエチレン、ポリプロピレン、ポリブテン等からなる肉薄シート１のほぼ中央に貫通孔１１を設け、該シート１の上面に貫通孔１１の周縁から所定間隔をもって外周側に連続した渦巻状の溝１２を設ける。
【００１１】
そこで、前記渦巻状の溝１２に沿ってニクロム線等の電熱線２を嵌め込み、渦巻状の溝１２の内周端及び外周端から引き出した電熱線２の両端部に端子ピン２１を接続する。このとき、電熱線２の引き出し長さにある程度の余裕を持たせておくことが肝要であって、この引き出し長さが短か過ぎると、後述する金型の型閉めの際に端子ピン２１を上金型５に固定できないという問題が起きる。
【００１２】
尚、前記渦巻状の溝１２の間隔は電熱線２の線径等に応じて適宜設定することができる。例えば、線径が０．３〜１．５ｍｍの電熱線２を使用する場合には、溝１２の間隔を０．６〜５．０ｍｍの範囲で適宜設定し、溝１２の幅を電熱線２の線径とほぼ同一乃至はこれより若干広幅に形成するとよい。また、電熱線２の線径よりも溝１２を深くして、該溝１２内に電熱線２を嵌合させてからヒータ等で溝１２の開口部を溶融して部分的に閉塞しておくと、電熱線２が溝１２内から脱出するのを確実に防止することができる。
【００１３】
次に、この電熱マット１ａを略半円弧状の湾曲面を有する下金型４上に載置し、該下金型４の上面中央に設けた突起４１に電熱マット１ａの貫通孔１１を嵌め合わせて位置ずれしないようにセットする。そこで、下金型４を上金型５で覆うと共に、電熱線２の両端部に接続した端子ピン２１に端子保持プラグ６を装着し、それぞれの端子保持プラグ６，６を上金型５に設けた保持孔５１、５１に嵌挿する。
【００１４】
このとき、渦巻線の内周端から引き出した電熱線２を上金型５の下面に沿わせて外周側に引き出し、その端部に接続した端子ピン２１を外周端から引き出した電熱線２の端子ピン２１よりも上方に立ち上げて固定する。尚、前記上金型５は図３に示した如く半割型５ａ，５ｂからなる半割構造となっており、該半割型５ａ、５ｂの型合わせ面に設けた保持孔５１に端子保持プラグ６を挟み込んで固定できるようになっている。
【００１５】
この様にして下金型４と上金型５との間に電熱マット１ａをセットすると共に、コア金型７を下金型４の突起４１上に垂下させて型閉めした後、キャビテイ内にポリエチレン、ポリプロピレン、ポリブテン等の溶融樹脂を射出する。すると、溶融樹脂がキャビテイ内に充満して電熱マット１ａと一体的に融着する。
この射出成形の際に、渦巻状の溝１２の内周端から引き出した電熱線２は渦巻線と離隔しているので、電熱線同志が接触することはない。
【００１６】
最後に、キャビテイ内に射出した溶融樹脂が固化するのを待って金型４，５とコア金型７を型開きし、端子ピン２１から端子保持プラグ６を引き抜くと、図４に示した電気融着用分岐管継手が得られる。
【００１７】
【発明の効果】
以上詳述した如く、本発明の電気融着用分岐管継手は、渦巻線の内周端から引き出した電熱線をサドルの上面に沿わせて外周側に引き出すと共に、その端部に接続した端子ピンを外周端から引き出した電熱線の端子ピンよりも上方に立ち上げたので、渦巻状に巻回した電熱線と、該渦巻線の内周端から引き出した電熱線とが離隔した状態で埋設される。このため、電熱線同志が接触することがなく、確実かつ強固な融着接合が得られる。
【図面の簡単な説明】
【図１】図１は本発明で使用する電熱マットの一実施例を示す平面図である。
【図２】図２は電熱マットを金型内にセットした状態の断面図である。
【図３】図３は図２のＸーＸ線断面図である。
【図４】図４は本発明の電気融着用分岐管継手を示す断面図である。
【符号の説明】
１ 合成樹脂シート
２ 電熱線
３ 電気融着用分岐管継手
２１ 端子ピン
３１ サドル
３２ 枝管
３３ 孔[0001]
[Industrial applications]
The present invention relates to a branch pipe joint for electric welding in which a branch pipe integrally projects from an upper surface of a saddle curved in a substantially semicircular arc shape, and a heating wire is spirally embedded at a predetermined interval on the back surface of the saddle.
[0002]
[Prior art]
Generally, a branch pipe joint of this type for electric fusion is provided with a spiral groove on one side of a synthetic resin sheet, and sets an electric heating mat in which a heating wire is fitted along the groove in a mold, and then sets a cavity. The molten resin is injection molded inside.
[0003]
[Problems to be solved by the invention]
However, during the injection molding, the heating wire drawn out from the inner peripheral end of the spiral winding comes into contact with the heating wire protruding from the groove, or when the heating wire is heated, the resin melts and the adjacent heating wire Contact. When the heating wires come into contact with each other in this manner, when the power is turned on, the contact portion may generate abnormal heat and may cause poor fusion.
[0004]
The present invention has solved the above-mentioned problem, and provides a branch pipe joint for electric welding in which heating wires do not come into contact with each other and no defective fusion occurs.
[0005]
[Means for Solving the Problems]
The branch pipe joint for electric welding according to the present invention has a branch pipe integrally projecting from an upper surface of a saddle curved in a substantially semi-arc shape, and a heating wire centered on a hole communicating with the branch pipe on the back surface of the saddle. It is embedded in a spiral shape at intervals, and terminal pins are connected to the ends of the heating wires drawn out from the inner peripheral end and the outer peripheral end of the spiral winding, and each terminal pin is erected in a plug provided on the upper surface of the saddle. It was done. Then, the heating wire drawn from the inner peripheral end of the spiral winding is drawn out to the outer peripheral side along the upper surface of the saddle, and the terminal pin connected to the end is drawn above the terminal pin of the heating wire drawn from the outer peripheral end. It is characterized by being launched.
[0006]
[Action]
Since the heating wire wound spirally and the heating wire drawn from the inner peripheral end of the spiral are buried in a state of being separated from each other, the heating wires do not contact each other.
[0007]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of an electric heating mat used in the present invention, FIG. 2 is a sectional view showing a state where the electric heating mat is set in a mold, and FIG. 3 is a sectional view taken along line XX of FIG. 4 is a sectional view showing a branch pipe joint for electric fusion of the present invention, in which 1 is a synthetic resin sheet, 2 is a heating wire, and 3 is a branch pipe joint for electric fusion.
[0008]
As shown in FIG. 4, the branch pipe joint 3 for electrofusion according to the present invention has a branch pipe 32 integrally projecting from the upper surface of a saddle 31 curved in a substantially semicircular arc shape, and a branch pipe 32 on the back surface of the saddle 31. The heating wire 2 is spirally buried around a hole 33 communicating with the hole.
[0009]
Terminal pins 21 are connected to the ends of the heating wire 2 drawn from the inner and outer ends of the spiral winding. Each terminal pin 21 is provided in a plug 34 provided on the upper surface of the saddle 31. ing. The heating wire 2 drawn out from the inner peripheral end of the spiral winding is drawn out to the outer peripheral side along the upper surface of the saddle 31, and the terminal pin 21 connected to the end is connected to the terminal pin of the heating wire 2 drawn out from the outer peripheral end. It is raised above 21.
[0010]
The manufacturing process of the branch pipe joint 3 for electric fusion includes a molding process of the electric heating mat 1a and a molding process of setting the electric heating mat 1a in a mold and then injecting a molten resin. First, in the first forming step of the electric heating mat 1a, a through hole 11 is provided substantially at the center of the thin sheet 1 made of polyethylene, polypropylene, polybutene, etc. A continuous spiral groove 12 is provided.
[0011]
Then, the heating wire 2 such as a nichrome wire is fitted along the spiral groove 12, and terminal pins 21 are connected to both ends of the heating wire 2 drawn out from the inner peripheral end and the outer peripheral end of the spiral groove 12. At this time, it is important to allow a certain margin for the drawing-out length of the heating wire 2. If the drawing-out length is too short, the terminal pins 21 are closed when closing the mold described later. There is a problem that it cannot be fixed to the upper mold 5.
[0012]
The interval between the spiral grooves 12 can be set as appropriate according to the diameter of the heating wire 2 and the like. For example, when the heating wire 2 having a wire diameter of 0.3 to 1.5 mm is used, the interval between the grooves 12 is appropriately set in the range of 0.6 to 5.0 mm, and the width of the groove 12 is set to the heating wire 2. It is preferable that the wire diameter is substantially the same as or slightly wider than this. Further, the groove 12 is made deeper than the wire diameter of the heating wire 2, the heating wire 2 is fitted into the groove 12, and then the opening of the groove 12 is melted by a heater or the like and partially closed. Then, it is possible to reliably prevent the heating wire 2 from escaping from the inside of the groove 12.
[0013]
Next, the electric heating mat 1a is placed on the lower mold 4 having a substantially semicircular curved surface, and the through hole 11 of the electric heating mat 1a is fitted to a projection 41 provided at the center of the upper surface of the lower mold 4. Set it so that it does not shift. Therefore, the lower mold 4 is covered with the upper mold 5, and the terminal holding plugs 6 are attached to the terminal pins 21 connected to both ends of the heating wire 2, and the respective terminal holding plugs 6, 6 are attached to the upper mold 5. It is inserted into the holding holes 51 provided.
[0014]
At this time, the heating wire 2 drawn from the inner peripheral end of the spiral winding is drawn to the outer peripheral side along the lower surface of the upper mold 5, and the terminal pin 21 connected to the end of the heating wire 2 is drawn from the outer peripheral end. It is raised above the terminal pins 21 and fixed. As shown in FIG. 3, the upper mold 5 has a half structure including half molds 5a and 5b. Terminals are held in holding holes 51 provided in the mating surfaces of the half molds 5a and 5b. The plug 6 can be sandwiched and fixed.
[0015]
In this manner, the electric heating mat 1a is set between the lower mold 4 and the upper mold 5, and the core mold 7 is suspended on the projection 41 of the lower mold 4 to close the mold. Inject molten resin such as polyethylene, polypropylene and polybutene. Then, the molten resin fills the cavity and fuses integrally with the electric heating mat 1a.
During the injection molding, the heating wire 2 drawn from the inner peripheral end of the spiral groove 12 is separated from the spiral winding, so that the heating wires do not come into contact with each other.
[0016]
Finally, after the molten resin injected into the cavity is solidified, the molds 4, 5 and the core mold 7 are opened, and the terminal holding plug 6 is pulled out from the terminal pin 21. A branch pipe joint for fusion is obtained.
[0017]
【The invention's effect】
As described in detail above, the branch pipe joint for electric fusion according to the present invention draws the heating wire drawn from the inner peripheral end of the spiral winding to the outer peripheral side along the upper surface of the saddle and the terminal pin connected to the end. Is raised above the terminal pin of the heating wire drawn from the outer peripheral end, so that the heating wire wound spirally and the heating wire drawn from the inner peripheral end of the spiral winding are buried in a separated state. You. Therefore, the heating wires do not come into contact with each other, and a reliable and strong fusion bonding can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing one embodiment of an electric heating mat used in the present invention.
FIG. 2 is a cross-sectional view showing a state where an electric heating mat is set in a mold.
FIG. 3 is a sectional view taken along line XX of FIG. 2;
FIG. 4 is a sectional view showing a branch pipe joint for electric fusion according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 synthetic resin sheet 2 heating wire 3 branch joint for electric welding 21 terminal pin 31 saddle 32 branch pipe 33 hole

Claims (1)

略半円弧状に湾曲したサドル（３１）の上面に枝管（３２）を一体的に突設し、またサドル（３１）の裏面に枝管（３２）と連通する孔（３３）を中心として電熱線（２）を所定間隔で渦巻状に埋設すると共に、該渦巻線の内周端及び外周端から引き出した電熱線（２）の端部に端子ピン（２１）を接続してそれぞれの端子ピン（２１）をサドル（３１）の上面に設けたプラグ（３４）内に立設した管継手であって、渦巻線の内周端から引き出した電熱線（２）をサドル（３１）の上面に沿わせて外周側に引き出すと共に、その端部に接続した端子ピン（２１）を外周端から引き出した電熱線（２）の端子ピン（２１）よりも上方に立ち上げたことを特徴とする電気融着用分岐管継手。A branch pipe (32) is integrally protruded from the upper surface of the saddle (31) curved in a substantially semicircular shape, and a hole (33) communicating with the branch pipe (32) is formed on the back surface of the saddle (31). The heating wires (2) are spirally embedded at predetermined intervals, and terminal pins (21) are connected to the ends of the heating wires (2) drawn out from the inner peripheral end and the outer peripheral end of the spiral winding, respectively. A pipe joint in which a pin (21) is erected in a plug (34) provided on an upper surface of a saddle (31), and a heating wire (2) drawn from an inner peripheral end of a spiral winding is provided on an upper surface of the saddle (31). And the terminal pin (21) connected to the end thereof is raised above the terminal pin (21) of the heating wire (2) drawn from the outer peripheral end. Branch pipe joint for electric welding.
JP17703794A 1994-07-28 1994-07-28 Electric welding branch pipe joint Expired - Fee Related JP3571763B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17703794A JP3571763B2 (en) 1994-07-28 1994-07-28 Electric welding branch pipe joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17703794A JP3571763B2 (en) 1994-07-28 1994-07-28 Electric welding branch pipe joint

Publications (2)

Publication Number Publication Date
JPH0842775A JPH0842775A (en) 1996-02-16
JP3571763B2 true JP3571763B2 (en) 2004-09-29

Family

ID=16024048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17703794A Expired - Fee Related JP3571763B2 (en) 1994-07-28 1994-07-28 Electric welding branch pipe joint

Country Status (1)

Country Link
JP (1) JP3571763B2 (en)

Also Published As

Publication number Publication date
JPH0842775A (en) 1996-02-16

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