JPH0334078Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a connection device that has a washable waterproof structure for surface heating devices such as electric blankets, electric sheets, and bed warmers.

(Prior art) Conventional planar heating devices such as electric blankets, electric sheets, bed warmers, etc. have cord heaters arranged in a meandering pattern inside fiber cloth such as blankets or quilting, and both ends of the cord heaters are connected to a connecting device. In addition to electrically and mechanically connecting and fixing the connecting device to the fiber cloth, heating was made possible by inserting the power supply plug from the temperature controller into the connecting device. Therefore, the structure of a connecting device that supplies power to a planar heating device is, for example, as proposed in Japanese Utility Model Application Publication No. 50-3813, in which a cord heater is electrically connected to a connecting fitting on a board, and After fixing the pin to the mounting base and electrically connecting it to the cord heater, the structure is such that the upper and lower covers made of synthetic resin are integrated and fixed with fiber cloth interposed.
As proposed in Publication No. 36000, after electrically and mechanically connecting the cord heater and a pair of connection pins, the connection terminal portion covered with an insulator was
As proposed in Japanese Patent No. 8222, the upper and lower cases are fixed with fiber cloth interposed therebetween.

(Problem that the invention aims to solve) This type of surface heating device is used as bedding in winter, so if it is used for a long time, it becomes unsanitary due to sweat and dirt, and it becomes necessary to wash it. was. However, the connection device proposed in Japanese Utility Model Application Publication No. 58-3813 does not have a watertight structure, so when washed, water leaks from the interface between the connection pin and the mounting base and between the cord heater and the upper and lower cases inside the case. Moreover, since the detergent is an ionic surfactant, it is difficult to completely remove it even if it dries.
As a result, the board, which must maintain insulating properties, becomes conductive, leading to malfunctions, short circuits, or electric shocks. Not only is it difficult to wash this type of surface heating device, but the structure is Because it is complex and has a large number of parts, it has the disadvantage of being prone to disconnections and poor contact due to mechanical shock and fatigue from plugging and unplugging the plug from the controller. Also, Kimiaki Sane
In the connection unit with the structure described in Publication No. 48-36000, the insulator and the cord heater are fused and bonded by the heat during molding, and there is almost no difference in expansion between the two, so it is easy to use when used for a long time. Although watertightness can be ensured without the formation of gaps or interfaces even during heat cycles, the connection pins and insulators not only do not come into close contact with each other, but also have a large difference in expansion coefficient, so gaps and interfaces are formed, and ionic surfactants Water containing a certain detergent penetrates the interface through capillary action, resulting in an electrical short circuit between the connecting pins or a drop in insulation resistance, causing malfunction. Not only can it not be washed, but since multiple unitized connection terminals are housed in the upper and lower cases, the connection device becomes large, which makes it uncomfortable when using a planar heating device. Ta.

(Means for solving the problem) The present invention was made to solve the problems of the conventional method. When electrically and mechanically connecting and fixing the pair of connecting pins to the connecting pin, the pair of connecting pins and the primary wire and secondary wire of the cord heater having a double structure are electrically connected via the wiring fixing part, and the connecting pin An elastic body covered with an adhesive layer is attached to the outer periphery near the root, and the entire outer periphery of this elastic body and the wiring fixing part is molded with an insulator.
The adhesive layer is melted by the heat generated during molding, and the elastic body and the insulator are bonded and integrated.

(Function) Since water containing detergent does not enter the connection device even after washing, it is possible to wash the planar heating device, and two or more connection pins can be integrally molded with an insulator. It is compact with fewer parts, has mechanical strength, and reduces the occurrence of disconnection failures due to fatigue during insertion and removal.

(Example) The example of the present invention will be described in detail according to the drawings.
The figure shows the connection device 1 for the planar heating device, and 2
As shown in Fig. 2, a primary wire 2b made of copper or copper alloy is spirally wound around a core system 2a made of Tetron, glass fiber, etc., and then a heat-sensitive layer 2c made of nylon, vinyl chloride, etc. is extruded. The cord heaters 3, 4, 5, and 6 are formed by forming a coating, further spirally winding a secondary wire 2d made of copper or copper alloy, and then extruding an insulating jacket 2e made of vinyl chloride. The connecting pin 3 forms a pair of connecting pins, and the connecting part 3a is made by cutting a round bar and the L-shaped wiring fixing part 3b is made by pressing a flat plate. electrically connected to the insulating jacket 2 of the cord heater 2
At the same time, the secondary wire 2d of the cord heater 2 is fixed by caulking with the connection holding part 3e and electrically connected to the connecting pin 3, and the connecting pin 4 is cut from a round bar. The connecting portion 4a made by pressing the wire and the wire fixing portion 4b made by pressing a flat plate are mechanically and electrically joined by the caulking connecting portion 4c. 2c, and the primary wire 2b of the cord heater 2 at the wiring fixing part 4b.
are electrically connected by soldering. 7 is an elastic body made of a material such as butyl rubber, chloroprene rubber, urethane rubber, etc., and its shape is as shown in FIG.
Insert the one covered with the above into the vicinity of the base of the connecting pin 3. 8 is the cord heater 2 and connection pins 3, 4, 5,
Insulators 8a and 8b made of vinyl chloride, for example, are molded to cover the area around the connecting portion with 6 and the entire outer periphery of the elastic body 7, as shown in FIG. The cord heater 2 is arranged in a meandering manner in the cord heater 2, and both ends of the cord heater 2 are electrically and mechanically connected to the connecting device 1. This is the mounting and fixing part.

The watertight structure between the cord heater 2 and the insulator 8 is created when the connecting device 1 is molded.
This is ensured by thermally fusing them. Further, watertightness between the connecting pin 3 and the insulator 8 is ensured by the elastic body 7. That is, the inner diameter of the elastic body 7 is the connecting portion 3a.
70 to 95% of the external shape of the elastic body 7.
Due to the binding force, the inner surface of the elastic body 7 and the metal connecting portion 3a do not form an interface that causes capillary action, thereby ensuring watertightness. Further, at the interface between the insulator 8 and the elastic body 7, the adhesive layer 7b coated on the elastic body 7 is melted by the heat during molding and acts as an adhesive to bond and integrate the elastic body and the insulator. Therefore, watertightness can be ensured without forming an interface. Therefore, even if water intrudes from the tip of the connecting pin 3 through the interface with the insulator 8, it is completely stopped by the elastic body 7 and cannot infiltrate further inside. The connection pins 4, 5, and 6 have a similar structure, and watertightness can be ensured without detergent water containing a surfactant entering the live parts, so the connection device 1 can be attached and fixed to the planar heating device 9. You can wash your clothes even if they are left unused. Although the elastic body 7 is provided with an adhesive layer 7b on the outer surface, the present invention is not limited to this, and watertightness can be maintained even if the entire surface of the tube 7a is covered with the adhesive layer 7b. Furthermore, the elastic body 7
If the shape is made into a concentric cylindrical tube, assembly workability is improved, but the same effect can be obtained by winding a tape-like material around the connecting portion 3a to make it into a cylindrical shape.

In terms of appearance and ease of insertion and removal, the connecting device 1 is small and compact because the connecting pins 3, 4, 5, and 6 are integrally molded with the insulator 8 even when the upper and lower covers are attached. It does not cause any discomfort in practical use.

(Effects of the invention) As described above, the invention has the following effects.

(1) Attach an elastic body coated with an adhesive layer to the outer periphery of the connecting pin, and mold the entire outer periphery of this elastic body and the wiring fixing part with an insulator, which will absorb the heat generated during molding. Since the adhesive layer is melted and the elastic body and insulator are bonded and integrated, it has a much better watertightness compared to conventional ones, and even when the surface heating device is washed. Its performance lasts for a long time.

(2) Since the area around the connection between the multiple connection pins and the cord heater is molded with an insulator,
It is small and compact, resistant to mechanical shock, and ensures watertightness without disconnection or poor contact due to fatigue when plugging and unplugging.

(3) By coating the surface of the elastic body with an adhesive layer that exhibits an adhesion function with the insulator through the heat generated during molding, workability when setting the elastic body on the connection pin and the connection between the elastic body and the insulating layer are improved. Improved adhesion reliability can be measured.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of a connecting device showing an embodiment of the present invention, Fig. 2 is a structural diagram of a cord heater, and Fig. 3 is an elasticity used in a connecting device showing an embodiment of the present invention. FIG. 4 is a plan view of a planar heating device using a connecting device according to an embodiment of the present invention. 1... Connection device, 2... Cord heater, 2b...
...Primary wire, 2d...Secondary line, 3, 4...Connection pin, 3a, 4a...Connection part, 7...Elastic body, 7b
... Adhesive layer, 8 ... Insulator, 3b, 4b ... Wiring fixing part.

Claims (1)

[Scope of utility model registration request] The pair of connecting pins 3, 4 and the primary wire 2b and secondary wire 2d of the cord heater 2 having a double structure are electrically connected via the wiring fixing parts 3b, 4b, and the connecting pins 3, 4 are An elastic body 7 whose surface is coated with an adhesive layer 7b is attached to the outer periphery near the root, and the entire outer periphery of this elastic body 7 and the wiring fixing parts 3b and 4b is molded with an insulator 8. A connection device characterized in that it has a structure in which an insulator 8 and an elastic body 7 are bonded and integrated by an adhesive layer 7b using heat.