JPH0293190A - Tube fitting for electrical fusion and manufacture thereof - Google Patents

Tube fitting for electrical fusion and manufacture thereof

Info

Publication number
JPH0293190A
JPH0293190A JP63246680A JP24668088A JPH0293190A JP H0293190 A JPH0293190 A JP H0293190A JP 63246680 A JP63246680 A JP 63246680A JP 24668088 A JP24668088 A JP 24668088A JP H0293190 A JPH0293190 A JP H0293190A
Authority
JP
Japan
Prior art keywords
joint
covered wire
pipe
wire unit
buth
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
Application number
JP63246680A
Other languages
Japanese (ja)
Inventor
Kiyokazu Shimokawa
下川　清和
Yuichiro Goto
雄一郎 後藤
Hideki Masu
秀樹 倍
Takatomo Harada
孝知 原田
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP63246680A priority Critical patent/JPH0293190A/en
Publication of JPH0293190A publication Critical patent/JPH0293190A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B29D23/008—T-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
    • 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
    • B29C66/5224—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
    • 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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis

Landscapes

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

Abstract

PURPOSE:To increase the joint strength with a buth pipe by forming a covered wire applied with the insulating covering work onto an electric heating strand, into a flat plate-shaped swirl and forming a covered wire unit by fixing a part of the covered wire and insertion-molding the covered wire unit to a prescribed shape. CONSTITUTION:On the joint surface 16 of a joint part 14, a covered wire unit 24 is integrally insertion-molded onto the periphery of a through hole 18. The covered wire unit 24 is prepared by forming a covered wire 28 applied with insulating covering work, into swirl firm onto an electrical heating strand 26. A tube fitting 10 for electrical fusion is placed onto a buth pipe so that the joint surface 16 is set along the outer peripheral surface of the buth pipe. The metal strand 26 is put into electric conduction and heat-generated, and the resin in the joint part between the joint surface 16 and the buth pipe is molten. When the both are strongly press-attached in this state, the pipe joint 10 for electrical fusion and the but pipe are fused.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電気融着用管継手の製造方法および電気融着
用管継手に関し、特にたとえばガスや水道などの配管に
用いられる、電気融着用管継手の製造方法および電気融
着用管継手に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a pipe joint for electric fusion and a pipe joint for electric fusion, and particularly to a pipe joint for electric fusion used for piping for gas, water, etc. The present invention relates to a manufacturing method and a pipe joint for electric fusion.

〔従来技術〕[Prior art]

従来、たとえばサドルのような管継手を母管に融着する
方法として、管継手と母管との間に融着マットを介挿す
る方法があったが、最近では、電気融着（Ｅｌｅｃｔｒ
ｏ　Ｆｕｓｉｏｎ）による接続も行われている。Conventionally, a method for welding a pipe joint such as a saddle to a main pipe was to insert a welding mat between the pipe joint and the main pipe, but recently, electric fusion
o Fusion) is also used.

この種の電気融着用管継手１の一例として、第７図に示
すようなものがある。この従来の電気融着用管継手１は
、図示しない母管に接合される接合部２と分岐管部３と
を含む。そして、接合部２の接合面４には、その表面に
形成された螺旋状の溝５に金属素線６が埋め込まれたマ
ツドアが配置され、インサート成型される。このとき、
マツドアは接合部２および分岐管部３と同一材料で形成
されているので、マツドアは接合部２と一体化する。An example of this type of electrical fusion pipe joint 1 is shown in FIG. This conventional electric fusion pipe joint 1 includes a joint portion 2 and a branch pipe portion 3 that are joined to a main pipe (not shown). Then, on the joint surface 4 of the joint portion 2, a pine door in which a metal wire 6 is embedded in a spiral groove 5 formed on the surface thereof is arranged, and insert molding is performed. At this time,
Since the pine door is made of the same material as the joint part 2 and the branch pipe part 3, the pine door is integrated with the joint part 2.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来の電気融着用管継手１では、第８図からよくわかる
ように、マツドアをインサート成型するときに、樹脂が
溝５の中に完全には充填されず、空隙８が残ってしまう
。そのために、母管との接合時に十分な圧力が加わらず
、電気融着用管継手１と母管との接合強度が弱くなって
しまうという問題点があった。In the conventional electric fusion pipe joint 1, as can be clearly seen from FIG. 8, when the pine door is insert-molded, the groove 5 is not completely filled with resin, leaving a gap 8. For this reason, there was a problem in that sufficient pressure was not applied during joining with the main pipe, and the joint strength between the electric fusion pipe joint 1 and the main pipe became weak.

それゆえに、この発明の主たる目的は、母管との接合強
度を強くできる、電気融着用管継手の製造方法および電
気融着用管継手を提供することである。Therefore, the main object of the present invention is to provide a method for manufacturing a pipe joint for electric fusion, and a pipe joint for electric fusion, which can strengthen the joint strength with the main pipe.

〔課題を解決するための手段〕[Means to solve the problem]

この発明は、（ａ）電熱用素線に絶縁被覆加工を施した
被覆線を準備するステップ、（ｂ）被覆線を平板な渦巻
状に形成するステップ、（Ｃ）渦巻状の被覆線の一部を
固定して被覆線ユニットを形成するステップ、被覆線ユ
ニットとともに所定形状にインサート成型するステップ
を含む、電気融着用管継手の製造方法である。This invention includes (a) preparing a covered wire obtained by applying insulation coating to an electric heating element wire, (b) forming the covered wire into a flat spiral shape, and (C) forming one of the spiral covered wires. This is a method of manufacturing a pipe joint for electric fusion, including the steps of fixing the parts to form a covered wire unit, and insert molding together with the covered wire unit into a predetermined shape.

〔作用〕[Effect]

被覆線ユニットとともに所定形状にインサート成型する
ことによって電気融着用管継手が得られる。このとき、
電熱用素線は予め絶縁被覆されているので、その素線の
周囲はすべて絶縁樹脂で被われている。そして、インサ
ート成型時にその絶縁被覆が継手本体の樹脂と一体化さ
れる。A pipe joint for electric fusion can be obtained by insert molding the coated wire unit into a predetermined shape. At this time,
Since the electric heating wire is insulated in advance, the entire periphery of the wire is covered with insulating resin. Then, during insert molding, the insulating coating is integrated with the resin of the joint body.

〔発明の効果〕〔Effect of the invention〕

この発明によれば、電熱用素線の周囲に従来のような空
隙は形成されないので、そのような空隙に起因して母管
との接合強度が弱くなることはない この発明の上述の目的、その他の目的、特徴および利点
は、図面を参照して行う以下の実施例の詳細な説明から
一層明らかとなろう。According to the present invention, no voids are formed around the electric heating strands, so the bonding strength with the main pipe is not weakened due to such voids. Other objects, features, and advantages will become more apparent from the following detailed description of the embodiments with reference to the drawings.

〔実施例〕〔Example〕

第１Ａ図〜第１Ｃ図および第２図を参照して、この実施
例の電気融着用管継手１０は、たとえばサドルのような
継手本体１２を含む。継手本体１２は、図示しない母管
と接合される接合部１４を有する。接合部１４は湾曲さ
れていて、その内周面すなわち母管との接合面１６が母
管の外周面に沿うようにされている。このような接合部
１４のほぼ中央には貫通孔１８が形成され、貫通孔１８
の上には、分岐管２０が接合部１４の外周面から突出す
るように一体的に形成される。また、接合部１４の外周
面には、分岐管２０を挟んで２つの突起部２２ａおよび
２２ｂが形成される。Referring to FIGS. 1A to 1C and FIG. 2, the electrical fusion pipe fitting 10 of this embodiment includes a fitting body 12, such as a saddle. The joint body 12 has a joint portion 14 that is joined to a main pipe (not shown). The joint portion 14 is curved, and its inner circumferential surface, that is, the joint surface 16 with the main pipe runs along the outer circumferential surface of the main pipe. A through hole 18 is formed approximately in the center of such a joint portion 14, and the through hole 18
A branch pipe 20 is integrally formed above the joint portion 14 so as to protrude from the outer circumferential surface of the joint portion 14 . Furthermore, two protrusions 22a and 22b are formed on the outer circumferential surface of the joint 14 with the branch pipe 20 in between.

接合部１４の接合面１６には、貫通孔１８の周囲に、被
覆線ユニット２４が一体的にインサート成型されている
。この被覆線ユニット２４は、第２図に示すように、電
熱用素線すなわち金属素線２６に絶縁被覆加工を施した
被覆線２８を渦巻状に形成したものである。そして、金
属素線２６の両端に接続されたコネクタ３０が上述の突
起部２２ａおよび２２ｂに配置される。A covered wire unit 24 is integrally insert-molded on the joint surface 16 of the joint portion 14 around the through hole 18 . As shown in FIG. 2, the covered wire unit 24 is formed by forming a covered wire 28 in a spiral shape by applying an insulation coating to an electric heating wire, that is, a metal wire 26. Then, connectors 30 connected to both ends of the metal wire 26 are arranged on the above-mentioned protrusions 22a and 22b.

このような電気融着用管継手１０を、図示しない母管の
外周面に接合面１６が沿うように、母管上に載せる。そ
して、２つのコネクタ３０間に、図示しない電源から通
電すると、金属素線２６の電気抵抗によって発熱し、接
合面１６と母管との接合部分の樹脂が溶融する。その状
態で両者を強く圧接すれば、電気融着用管継手１ｏと母
管とが融着される。Such an electric fusion pipe joint 10 is placed on a main pipe (not shown) so that the joint surface 16 is along the outer circumferential surface of the main pipe (not shown). When electricity is applied between the two connectors 30 from a power supply (not shown), heat is generated due to the electrical resistance of the metal wire 26, and the resin at the joint between the joint surface 16 and the main tube melts. If the two are strongly pressed together in this state, the electric fusion pipe joint 1o and the main pipe are fused together.

このとき、接合面１６に被覆線ユニット２４を配置して
インサート成型しているので、金属素線２６の周囲はす
べて樹脂で充填される。したがって、第７図の従来の埋
め込み式のもので生じていた空隙は発生せず、そのよう
な空隙に起因する接合強度の弱化が有効に防止できる。At this time, since the coated wire unit 24 is arranged on the joint surface 16 and insert molding is performed, the entire periphery of the metal wire 26 is filled with resin. Therefore, the voids that occur in the conventional embedded type shown in FIG. 7 are not generated, and weakening of the bonding strength due to such voids can be effectively prevented.

なお、この電気融着用管継手１０は以下の方法によって
製造され得る。Note that this electrical fusion pipe joint 10 can be manufactured by the following method.

まず、金属素線２６に絶縁被覆加工を施した被覆線２８
を準備する。First, the coated wire 28 is made by applying insulation coating to the metal wire 26.
Prepare.

続いて、被覆線２８を、第３Ａ図および第３Ｂ図に示す
ような巻き取り機３２によって平板な渦巻状に巻き上げ
る。Subsequently, the covered wire 28 is wound into a flat spiral shape by a winder 32 as shown in FIGS. 3A and 3B.

巻き取り機３２は第１治具３４を含み、この第１治具３
４は中空部３６を有する円筒部３８を含み、その円筒部
３８の両端にそれぞれ円板状のフランジ４０および４２
が一体的に形成されている。The winder 32 includes a first jig 34, and the first jig 3
4 includes a cylindrical portion 38 having a hollow portion 36, and disk-shaped flanges 40 and 42 are provided at both ends of the cylindrical portion 38, respectively.
are integrally formed.

そして、フランジ４２には、第３Ｂ図からよくわかるよ
うに、スリット４４が形成される。そして、フランジ４
２の中空部３６の外周には、一部に切欠４６ａが形成さ
れたドーナツ状の突出部４６が形成される。この突出部
４６の段差は被覆線２８の太さとほぼ等しくなるように
設計されている一方、第２治具４８は中実の円柱部５０
を有し、その円柱部５０の両端にはフランジ５２および
５４が一体的に形成されている。円柱部５０の一方端面
には支持凹部５６が形成され、他方端面にはねじ孔５８
が形成される。このねじ孔５８には、固定具６０の先端
がねじ込まれ、それによって第２治具４８の軸線上に固
定具６０が固着される固定具６０はほぼ円柱状をなし、
その後方部分には送り歯６２が形成される。A slit 44 is formed in the flange 42, as clearly seen in FIG. 3B. And flange 4
A donut-shaped protrusion 46 in which a notch 46a is partially formed is formed on the outer periphery of the hollow portion 36 of No. 2. The step of the protruding portion 46 is designed to be approximately equal to the thickness of the covered wire 28, while the second jig 48 is designed to have a step formed by a solid cylindrical portion 50.
The cylindrical portion 50 has flanges 52 and 54 integrally formed at both ends thereof. A support recess 56 is formed on one end surface of the cylindrical portion 50, and a screw hole 58 is formed on the other end surface.
is formed. The tip of a fixture 60 is screwed into this screw hole 58, and thereby the fixture 60 is fixed on the axis of the second jig 48. The fixture 60 has a substantially cylindrical shape;
A feed dog 62 is formed in its rear portion.

このような第１治具３４および第２治具４８が、第３Ａ
図図示のように、フランジ５４の端面が突出部４６の端
面と当接するように、配置される。The first jig 34 and the second jig 48 are
As shown in the figure, the end face of the flange 54 is arranged so as to come into contact with the end face of the protrusion 46 .

このとき、第１治具３４の中空部３６を通して被覆線２
８を挿入し、その先端を切欠４６ａに嵌め込んでおく。At this time, the coated wire 2 is passed through the hollow part 36 of the first jig 34.
8 and fit its tip into the notch 46a.

したがって、被覆線２８は中空部３６の内径と固定具６
０の送り歯６２との間に保持される。Therefore, the coated wire 28 is connected to the inner diameter of the hollow part 36 and the fixture 6.
0 feed dog 62.

第１治具３４のフランジ４０が図示しないモータの回転
軸に連結されているので、上述の状態でそのモータを回
転させる。このとき、第２治具４８の支持用凹部５６に
支持軸（図示せず）が挿入され、モータによる第１治具
３４および第２治具４８の一体物の回転が支持される。Since the flange 40 of the first jig 34 is connected to the rotating shaft of a motor (not shown), the motor is rotated in the above-described state. At this time, a support shaft (not shown) is inserted into the support recess 56 of the second jig 48, and rotation of the first jig 34 and the second jig 48 as a unit by the motor is supported.

第１治具３４および第２治具４８が回転すると、両フラ
ンジ４２および５４間の間隔に、送り歯６２によって送
られる被覆線２８が第３Ａ図に示すように順次巻回され
る。このようにして、第４図図示のように「かとり線香
」のような平板な渦巻状にされた被覆線２８が得られる
。When the first jig 34 and the second jig 48 rotate, the covered wire 28 fed by the feed dog 62 is sequentially wound in the space between the flanges 42 and 54 as shown in FIG. 3A. In this way, as shown in FIG. 4, a flat spiral covered wire 28 resembling a "katori incense stick" is obtained.

そして、渦巻き状の形状を維持するために、第３Ｂ図図
示のスリット４４を通してたとえば小型のヒータで加熱
し、被覆線２８を溶かして隣合う被覆線２８どうしを固
着して、第５図図示の被覆線ユニット２４を得る。Then, in order to maintain the spiral shape, the coated wires 28 are heated by, for example, a small heater through the slit 44 shown in FIG. A covered wire unit 24 is obtained.

その後、第６図に示すように、被覆線ユニット２４を、
電気融着用管継手１０を成型するための金型６４の底面
、すなわち電気融着用管継手１０の接合面１６となる部
分に配置し、インジケータ６６によって固定する。そし
て、その金型６４に樹脂を注入してインサート成型する
ことによって、第１Ａ図〜第１Ｃ図図示の電気融着用管
継手１０が形成される。Thereafter, as shown in FIG. 6, the covered wire unit 24 is
It is placed on the bottom surface of a mold 64 for molding the electrical fusion pipe fitting 10, that is, on the part that will become the joint surface 16 of the electrical fusion pipe fitting 10, and fixed by an indicator 66. Then, by injecting resin into the mold 64 and performing insert molding, the electrical fusion pipe joint 10 shown in FIGS. 1A to 1C is formed.

なお、渦巻状に形成された被覆線２８を固定して被覆線
ユニット２４を形成する方法は、第５図に示すように被
覆線２８の一部を融着する方法に限定されず、被覆線２
８の片面全面を溶融解して完全にフラットになるように
形成してもよい。この場合、フラットな面が接合面１６
に配置され得る。Note that the method of fixing the covered wire 28 formed in a spiral shape to form the covered wire unit 24 is not limited to the method of fusing a part of the covered wire 28 as shown in FIG. 2
8 may be melted on one side to form a completely flat surface. In this case, the flat surface is the joint surface 16
can be placed in

また、このときの加熱装置はヒータに限定されず、こて
等であってもよい。Further, the heating device at this time is not limited to a heater, but may be a trowel or the like.

さらに、被覆線２８を渦巻状に形成するのに第３Ａ図お
よび第３Ｂ図に示すような巻き取り機３２を必ずしも用
いる必要はなく、手作業で行う等、その他の任意の方法
が利用可能である。Furthermore, it is not necessary to use a winder 32 as shown in FIGS. 3A and 3B to form the coated wire 28 into a spiral shape, and any other method can be used, such as manually. be.

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

第１Ａ図ないし第１Ｃ図はこの発明の一実施例を示す図
解図であり、第１Ａ図は一部断面正面図、第１Ｂ図は一
部断面左側面図、第１Ｃ図は下面図を示す。 第２図は接合面に被覆線ユニットが形成されている状態
を示す一部破断拡大図である。 第３Ａ図および第３Ｂ図は巻き取り機を示す図解図であ
り、第３Ａ図は正面断面図、第３Ｂ図はＡ−Ａ矢視図で
ある。 第４図は渦巻き状に形成された被覆線を示す図解図であ
る。 第５図は被覆線ユニットを示す図解図である。 第６図は金型に被覆線ユニットを配置してインサート成
型する状態を示す図解図である。 第７図は従来技術を示す図解図である。 第８図は第７図の一部破断拡大図である。 図において、１０は電気融着用管継手、１２は継手本体
、１４は接合部、１６は接合面、２４は被覆線ユニット
、２６は金属素線、２８は被覆線、６４は金型を示す。 特許出願人　久保田鉄工株式会社 代理人　弁理士　山　１）義　人 Ｆ−１ 図 ト 浪 区 ■ 味1A to 1C are illustrative views showing one embodiment of the present invention, in which FIG. 1A is a partially sectional front view, FIG. 1B is a partially sectional left side view, and FIG. 1C is a bottom view. . FIG. 2 is a partially cutaway enlarged view showing a state in which a covered wire unit is formed on the joint surface. FIGS. 3A and 3B are illustrative views showing the winding machine, with FIG. 3A being a front sectional view and FIG. 3B being a view taken along the line A-A. FIG. 4 is an illustrative view showing a covered wire formed in a spiral shape. FIG. 5 is an illustrative view showing the covered wire unit. FIG. 6 is an illustrative view showing a state in which a covered wire unit is placed in a mold and insert molding is performed. FIG. 7 is an illustrative diagram showing the prior art. FIG. 8 is a partially cutaway enlarged view of FIG. 7. In the figure, 10 is a pipe joint for electric fusion, 12 is a joint body, 14 is a joint, 16 is a joint surface, 24 is a coated wire unit, 26 is a metal wire, 28 is a coated wire, and 64 is a mold. Patent Applicant Kubota Iron Works Co., Ltd. Agent Patent Attorney Yama 1) Yoshito F-1 Tsutonami Ward■ Aji

Claims (1)

【特許請求の範囲】 １　（ａ）電熱用素線に絶縁被覆加工を施した被覆線を
準備するステップ、 （ｂ）前記被覆線を平板な渦巻状に形成するステップ、 （ｃ）前記渦巻状の被覆線の一部を固定して被覆線ユニ
ットを形成するステップ、 前記被覆線ユニットとともに所定形状にインサート成型
するステップを含む、電気融着用管継手の製造方法。 ２　前記被覆線ユニットをその接合面に配置して所定形
状にインサート成型された、電気融着用管継手。[Claims] 1 (a) preparing a coated wire obtained by applying insulation coating to an electric heating strand, (b) forming the coated wire into a flat spiral shape, (c) the spiral shape. A method of manufacturing a pipe joint for electrical fusion, comprising: fixing a part of the covered wire to form a covered wire unit; and insert molding together with the covered wire unit into a predetermined shape. 2. A pipe joint for electric fusion, which is insert-molded into a predetermined shape with the coated wire unit disposed on the joint surface thereof.
JP63246680A 1988-09-30 1988-09-30 Tube fitting for electrical fusion and manufacture thereof Pending JPH0293190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63246680A JPH0293190A (en) 1988-09-30 1988-09-30 Tube fitting for electrical fusion and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63246680A JPH0293190A (en) 1988-09-30 1988-09-30 Tube fitting for electrical fusion and manufacture thereof

Publications (1)

Publication Number Publication Date
JPH0293190A true JPH0293190A (en) 1990-04-03

Family

ID=17152022

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63246680A Pending JPH0293190A (en) 1988-09-30 1988-09-30 Tube fitting for electrical fusion and manufacture thereof

Country Status (1)

Country Link
JP (1) JPH0293190A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02238929A (en) * 1988-11-21 1990-09-21 Central Plastics Co Electric heating element for melting thermoplastic material
US8864208B2 (en) 2012-12-27 2014-10-21 Kawasaki Jukogyo Kabushiki Kaisha Panel locking structure for cargo bed of vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02238929A (en) * 1988-11-21 1990-09-21 Central Plastics Co Electric heating element for melting thermoplastic material
US8864208B2 (en) 2012-12-27 2014-10-21 Kawasaki Jukogyo Kabushiki Kaisha Panel locking structure for cargo bed of vehicle

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