JPH07113490A - Electric heating mat - Google Patents

Electric heating mat

Info

Publication number
JPH07113490A
JPH07113490A JP5258685A JP25868593A JPH07113490A JP H07113490 A JPH07113490 A JP H07113490A JP 5258685 A JP5258685 A JP 5258685A JP 25868593 A JP25868593 A JP 25868593A JP H07113490 A JPH07113490 A JP H07113490A
Authority
JP
Japan
Prior art keywords
electric heating
heating wire
hole
peripheral side
heating mat
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
JP5258685A
Other languages
Japanese (ja)
Inventor
Ryuichiro Nakamura
隆一郎 中村
Kazunori Umeda
一徳 梅田
Sumio Matsuno
純雄 松野
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.)
Mitsubishi Plastics Inc
Original Assignee
Mitsubishi Plastics Inc
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 Mitsubishi Plastics Inc filed Critical Mitsubishi Plastics Inc
Priority to JP5258685A priority Critical patent/JPH07113490A/en
Publication of JPH07113490A publication Critical patent/JPH07113490A/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
    • 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

Landscapes

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

Abstract

PURPOSE:To provide an electric heating mat which can form a branched pipe coupling and prevents the short-circuit of an electric heating wire. CONSTITUTION:A through hole 32 is formed at the near center part of a synthetic resin sheet 31. A virtual line L which passes through the through hole 32 is supposed, and semicircular swirl grooves 33a and 33b which are continuous from the outer peripheral side to the inner peripheral side, turned back at the position in the vicinity of the virtual line L around the through hole 32 are cut on both the sides of the virtual line L, and the inner peripheral side edge parts of the semicircular swirl grooves 33a and 33b are connected, getting over the virtual line L, and an electric heating wire 2 is installed along the grooves 33a and 33b. Accordingly, the short-circuit of the electric heating wire in the case when an electric heating mat is set in a metal mold cavity and the molten resin is jetted is prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、略半円弧状に湾曲した
サドルの上面に枝管が一体的に突出し、またサドルの裏
面に電熱線が埋設された分岐管継手の成形に用いられる
電熱マットに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating used for forming a branch pipe joint in which a branch pipe is integrally projected on the upper surface of a saddle curved in a substantially semi-circular shape, and a heating wire is embedded in the rear surface of the saddle. Regarding Matt.

【０００２】[0002]

【従来の技術】この種の電熱マットとして、例えば実開
平１ー１２１７９４号公報には、合成樹脂シートのほぼ
中央部に貫通孔を設け、該貫通孔を中心として渦巻状に
連続した溝を刻設すると共に該溝に沿って電熱線を装着
し、またシートにヒータを当てがって溶融した樹脂で電
熱線が溝からはみ出さないようにした電熱マットが提案
されている。2. Description of the Related Art As an electric heating mat of this kind, for example, in Japanese Utility Model Laid-Open No. 1-1121794, a through hole is provided in a substantially central portion of a synthetic resin sheet, and a spiral continuous groove is formed around the through hole. There has been proposed an electric heating mat which is provided with a heating wire attached along the groove, and a heater is applied to the sheet to prevent the heating wire from protruding from the groove by the molten resin.

【０００３】[0003]

【発明が解決しようとする課題】ところで、この電熱マ
ットは貫通孔を中心とする渦巻状の溝に沿って電熱線が
装着されているので、渦巻溝の内周端から引き出された
電熱線の端部は電熱線が装着された渦巻溝の上方を横切
って外周側に引き出されることになる。このため、この
電熱マットを金型内にセットしてサドルの裏面に電熱線
が埋設された分岐管継手を成形する場合、金型キャビテ
イ内に溶融樹脂を射出したとき、電熱マットの軟化・溶
融に伴って溝内からはみ出した電熱線が渦巻溝の上方を
横切っている電熱線の端部と接触してショートすること
があった。By the way, in this electric heating mat, the heating wire is attached along the spiral groove centering on the through hole, so that the heating wire drawn out from the inner peripheral end of the spiral groove is The end portion is drawn to the outer peripheral side across the spiral groove in which the heating wire is mounted. For this reason, when this electric heating mat is set in the mold and a branch pipe joint with the heating wire embedded in the back surface of the saddle is formed, when the molten resin is injected into the mold cavity, the electric heating mat softens and melts. As a result, the heating wire protruding from the groove sometimes came into contact with the end of the heating wire crossing over the spiral groove to cause a short circuit.

【０００４】本発明はかかる課題を解決したものであっ
て、サドルの裏面に電熱線が埋設された分岐管継手を成
形する際に、電熱線がショートすることのない電熱マッ
トを提供するものである。The present invention has been made to solve the above problems and provides an electric heating mat which does not short-circuit the heating wires when forming a branch pipe joint in which the heating wires are embedded in the back surface of the saddle. is there.

【０００５】[0005]

【課題を解決するための手段】本発明の電熱マットは、
合成樹脂シートのほぼ中央部に貫通孔を設け、該貫通孔
を通る仮想線を想定してその両側に貫通孔を中心として
仮想線の近傍位置で折り返しつつ外周側から内周側に連
続する半円状の渦巻溝を刻設し、それぞれの半円状の渦
巻溝の内周側端部を仮想線を跨いで連続させると共に、
該溝に沿って電熱線を装着したことを特徴とする。The electric heating mat of the present invention comprises:
A through hole is provided substantially at the center of the synthetic resin sheet, and assuming a virtual line passing through the through hole, fold back around the through hole on both sides of the synthetic resin sheet at positions near the virtual line and continue from the outer peripheral side to the inner peripheral side. A circular spiral groove is engraved, and the inner peripheral side end of each semicircular spiral groove is made continuous across the imaginary line,
A heating wire is attached along the groove.

【０００６】[0006]

【作用】電熱線の両端部はそれぞれの半円状の渦巻溝の
外周端から引き出されるので、電熱線同志が接触するこ
とはない。Since both ends of the heating wire are drawn out from the outer peripheral ends of the respective semicircular spiral grooves, the heating wires do not come into contact with each other.

【０００７】[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は本発明の一実施例を示す電熱マットの平面
図、図２は電熱マットを金型内にセットした状態を示す
断面図、図３は射出成形によって得られた分岐管継手の
断面図であって、図中１は分岐管継手、２はニクロム
線、銅ニッケル線等の電熱線、３は電熱マットである。Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a plan view of an electric heating mat showing an embodiment of the present invention, FIG. 2 is a sectional view showing a state in which the electric heating mat is set in a mold, and FIG. 3 is a sectional view of a branch pipe joint obtained by injection molding. In the figure, 1 is a branch pipe joint, 2 is a heating wire such as a nichrome wire or a copper nickel wire, and 3 is an electric heating mat.

【０００８】電熱マット３はポリエチレン、ポリプロピ
レン、ポリブテン等の肉薄の合成樹脂シート３１からな
るものであって、該シート３１のほぼ中央部に貫通孔３
２を設ける。尚、図１には円形状に形成した合成樹脂シ
ート３１を例示したが、該シート３１は成形する分岐管
継手１のサドル１１の形状等に応じて楕円形状あるいは
方形状とすることができる。The electric heating mat 3 is made of a thin synthetic resin sheet 31 made of polyethylene, polypropylene, polybutene or the like, and the through hole 3 is formed in the substantially central portion of the sheet 31.
2 is provided. Although the synthetic resin sheet 31 formed in a circular shape is illustrated in FIG. 1, the sheet 31 may have an elliptical shape or a rectangular shape depending on the shape of the saddle 11 of the branch pipe joint 1 to be formed.

【０００９】この合成樹脂シート３１の片面に電熱線２
を装着する半円状の渦巻溝３３ａ，３３ｂを刻設する。
即ち、貫通孔３２を通る仮想線Ｌを想定し、その両側に
貫通孔３２を中心として仮想線Ｌの近傍位置で折り返し
つつ外周側から内周側に連続する半円状の渦巻溝３３
ａ，３３ｂを刻設し、それぞれの半円状の渦巻溝３３
ａ，３３ｂの内周側端部を仮想線Ｌを跨いで連続させ
る。そこで、この溝３３ａ，３３ｂに沿って電熱線２を
装着し、それぞれの半円状の渦巻溝３３ａ，３３ｂの外
周端から引き出した電熱線２の端部に端子ピン２１を接
続する。このとき、溝３３ａ、３３ｂにヒータを当てが
って、溶融した樹脂で溝３３ａ，３３ｂを部分的に閉塞
しておくとよい。The heating wire 2 is provided on one surface of the synthetic resin sheet 31.
The semicircular spiral grooves 33a and 33b for mounting are engraved.
That is, assuming an imaginary line L passing through the through hole 32, the semicircular spiral groove 33 that is continuous from the outer peripheral side to the inner peripheral side while being folded back on both sides of the phantom line L around the through hole 32 at positions near the imaginary line L.
a and 33b are engraved to form semicircular spiral grooves 33
The inner peripheral side end portions of a and 33b are continuous across the imaginary line L. Therefore, the heating wire 2 is mounted along the grooves 33a and 33b, and the terminal pins 21 are connected to the ends of the heating wire 2 drawn from the outer peripheral ends of the respective semicircular spiral grooves 33a and 33b. At this time, it is preferable to apply a heater to the grooves 33a and 33b so as to partially close the grooves 33a and 33b with the molten resin.

【００１０】前記半円状の渦巻溝３３ａ，３３ｂ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３３ａ，３３ｂの間隔を０．６〜
５．０ｍｍの範囲で適宜設定することができる。また、
溝３３ａ，３３ｂの幅は電熱線２の線径とほぼ同一に形
成し、その深さを電熱線２の線径より若干大き目に形成
するとよい。The space between the semicircular spiral grooves 33a and 33b can be appropriately set according to the wire diameter of the heating wire 2. 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 33a and 33b is 0.6 to
It can be appropriately set within the range of 5.0 mm. Also,
The widths of the grooves 33a and 33b may be formed to be substantially the same as the wire diameter of the heating wire 2, and the depth thereof may be formed to be slightly larger than the wire diameter of the heating wire 2.

【００１１】本発明の電熱マット３は上記の構成からな
るので、この電熱マット３を用いてサドルの裏面に電熱
線２が埋設された分岐管継手を成形する場合、図２に示
した如く電熱マット３を金型内にセットする。即ち、溝
３３ａ，３３ｂが形成された片面を上にして電熱マット
３を下型４上に載置し、上型５と中子６とを型閉めす
る。そこで、金型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。Since the electric heating mat 3 of the present invention has the above-mentioned structure, when the branch pipe joint in which the heating wire 2 is embedded on the back surface of the saddle is formed by using the electric heating mat 3, the electric heating mat 3 as shown in FIG. Set the mat 3 in the mold. That is, the electric heating mat 3 is placed on the lower mold 4 with one side having the grooves 33a and 33b formed upward, and the upper mold 5 and the core 6 are closed. Therefore, a molten resin such as polyethylene, polypropylene or polybutene is injected into the mold cavity.

【００１２】すると、金型キャビテイ内に溶融樹脂が充
満し、電熱マット３と溶融樹脂とが一体的に融着接合す
る。この射出成形の際に電熱マット３は軟化乃至は溶融
するが、電熱線２の両端部はそれぞれの半円状の渦巻溝
３３ａ，３３ｂの外周端から引き出されているので、接
触することがない。そこで、溶融樹脂が固化するのを待
って型開きすると、図３に示した如く略半円弧状に湾曲
したサドル１１の上面に枝管１２が一体的に突出し、ま
たサドル１１の裏面に電熱線２が埋設された分岐管継手
１が得られる。Then, the mold cavity is filled with the molten resin, and the electric heating mat 3 and the molten resin are integrally fusion-bonded to each other. At the time of this injection molding, the heating mat 3 is softened or melted, but since both ends of the heating wire 2 are pulled out from the outer peripheral ends of the semicircular spiral grooves 33a and 33b, they do not come into contact with each other. . Then, when the mold is opened after waiting for the molten resin to solidify, the branch pipe 12 integrally projects on the upper surface of the saddle 11 which is curved in a substantially semi-arcuate shape as shown in FIG. A branch pipe joint 1 in which 2 is buried is obtained.

【００１３】[0013]

【発明の効果】以上詳述した如く、本発明は仮想線の両
側に半円状の渦巻溝を刻設すると共に、それぞれの半円
状の渦巻溝の内周側端部を連続させたので、該溝に装着
した電熱線の両端部を溝の外周端から引き出すことがで
きる。従って、本発明の電熱マットを用いると、電熱線
がショートすることのない分岐管継手を成形することが
できる。As described above in detail, according to the present invention, the semicircular spiral grooves are engraved on both sides of the imaginary line, and the inner circumferential side ends of the respective semicircular spiral grooves are continuous. The both ends of the heating wire mounted in the groove can be pulled out from the outer peripheral end of the groove. Therefore, the use of the electric heating mat of the present invention makes it possible to form a branch pipe joint in which the electric heating wire is not short-circuited.

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

【図１】図１は本発明の一実施例を示す電熱マットの平
面図である。FIG. 1 is a plan view of an electric heating mat showing an embodiment of the present invention.

【図２】図２は電熱マットを金型内にセットした状態を
示す断面図である。FIG. 2 is a cross-sectional view showing a state where an electric heating mat is set in a mold.

【図３】図３は本発明の電熱マットを用いて成形した分
岐管継手の断面図である。FIG. 3 is a cross-sectional view of a branch pipe joint formed by using the electric heating mat of the present invention.

【符号の説明】[Explanation of symbols]

１ 分岐管継手 ２ 電熱線 ３ 電熱マット ３１ 合成樹脂シート ３２ 貫通孔 ３３ａ 半円状の渦巻溝 ３３ｂ 半円状の渦巻溝 DESCRIPTION OF SYMBOLS 1 Branch pipe joint 2 Heating wire 3 Electric heating mat 31 Synthetic resin sheet 32 Through hole 33a Semicircular spiral groove 33b Semicircular spiral groove

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 略半円弧状に湾曲したサドル（１１）の
上面に枝管（１２）が一体的に突出し、また前記サドル
（１１）の裏面に電熱線（２）が埋設された分岐管継手
（１）の成形に用いられる電熱マット（３）であって、
合成樹脂シート（３１）のほぼ中央部に貫通孔（３２）
を設け、該貫通孔（３２）を通る仮想線（Ｌ）を想定し
てその両側に貫通孔（３２）を中心として仮想線（Ｌ）
の近傍位置で折り返しつつ外周側から内周側に連続する
半円状の渦巻溝（３３ａ），（３３ｂ）を刻設し、それ
ぞれの半円状の渦巻溝（３３ａ），（３３ｂ）の内周側
端部を仮想線（Ｌ）を跨いで連続させると共に、該溝
（３３ａ），（３３ｂ）に沿って電熱線（２）を装着し
たことを特徴とする電熱マット。1. A branch pipe in which a branch pipe (12) is integrally projected on an upper surface of a saddle (11) curved in a substantially semi-circular shape, and a heating wire (2) is embedded on the back surface of the saddle (11). An electric heating mat (3) used for forming a joint (1),
A through hole (32) is formed substantially in the center of the synthetic resin sheet (31).
Is provided, and an imaginary line (L) passing through the through hole (32) is assumed, and the imaginary line (L) is centered on the through hole (32) on both sides thereof
The semicircular spiral grooves (33a) and (33b) which are continuous from the outer peripheral side to the inner peripheral side while being folded back in the vicinity of are engraved, and the semicircular spiral grooves (33a) and (33b) are An electric heating mat, characterized in that a peripheral side end portion is continuous over an imaginary line (L) and a heating wire (2) is attached along the grooves (33a), (33b).
JP5258685A 1993-10-15 1993-10-15 Electric heating mat Pending JPH07113490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5258685A JPH07113490A (en) 1993-10-15 1993-10-15 Electric heating mat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5258685A JPH07113490A (en) 1993-10-15 1993-10-15 Electric heating mat

Publications (1)

Publication Number Publication Date
JPH07113490A true JPH07113490A (en) 1995-05-02

Family

ID=17323683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5258685A Pending JPH07113490A (en) 1993-10-15 1993-10-15 Electric heating mat

Country Status (1)

Country Link
JP (1) JPH07113490A (en)

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