JPH11265620A - Flat cable - Google Patents

Abstract

(57) [Problem] To provide a compact heat-insulating wire and a tube without limiting the material of the tube which is combined with the insulated wire, thereby achieving space saving and weight reduction. Offers fused type flat cable with composite structure. A plurality of cables having a twisted structure of at least one insulated wire core and at least one thermoplastic resin tube are arranged in parallel, and adjacent cables are thermally fused to each other. When the insulated wire core and the thermoplastic resin tube in the twisted structure are twisted and arranged so that they are symmetrical in the cross section, up and down, left and right, when an external force is applied to the cable, the stress applied to all the insulated wire cores is evenly distributed. It is distributed so that the metal core due to partial bending of the insulated wire core is not concentrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable of a type in which a plurality of wires are arranged in parallel and adjacent ones are heat-sealed, and more particularly to a flat cable of this kind having a composite structure having an insulated wire core and a tube. About.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of this type of flat cable having a composite structure of an insulated wire core and a tube. An insulated wire core 1 and a tube 2 are arranged in parallel. By adjoining the adjacent portions of the sheath 3 to be the sheath by heat fusion, a flat cable of a heat fusion type is obtained.

[0003]

According to the prior art described above; according to the flat cable shown in FIG. 2, since the tubes 2 are arranged side by side on the insulated wire core 1 to form a composite, the flat cable is a heat fusion type flat cable. When completed, the overall cable width becomes inevitably large, and there is a problem that it cannot respond to space saving. In addition, since the sheath is placed over each of the insulated wire core and the tube, the material usage fee for the sheath increases, and it is difficult to reduce the weight.

[0004] Further, as described above, the tube 2 alone is covered with a sheath and is thermally fused to the sheath on the adjacent insulated wire core.
In addition, heat is directly applied at the time of heat fusion. In particular, the heat at the time of heat fusion becomes high enough to melt the sheath,
As the material of the tube, a material having a small heat shrinkage must be used, and the material is limited.

Therefore, the problems to be solved by the present invention (objects)
Is a heat-sealing type composite structure that can reduce the space and weight by compactly combining the insulated core and the tube without limiting the material of the tube combined with the insulated core. To provide a flat cable.

[0006]

According to the present invention, there is provided a flat cable in which a plurality of cables having a twisted structure of at least one insulated wire core and at least one thermoplastic resin tube are connected in parallel. It is formed by heat-sealing the arranged and mutually adjacent cables.

With the above construction, the insulated wire core and the tube can coexist in one cable unit, so that the cable can be stored compactly. It does not have to be as large as a flat cable. Also,
As described above, since the insulated wire core and the tube are combined in one cable, the sheath as the cable; the sheath can be made common, and accordingly, the covering material can be reduced and the weight can be reduced. .

Further, the tube is twisted as an interposition when the insulated wire is twisted. At this time, the insulated wire can function as a heat insulating material. Can be protected from heat. This makes it possible to arbitrarily select the material of the tube from the thermoplastic resin without taking into account the heat shrinkage at the time of heat fusion, which is particularly high in temperature.

When the insulated wire core and the thermoplastic resin tube in the above-mentioned twisted structure are twisted and arranged so as to be vertically and horizontally symmetrical in cross section, the stress applied to all the insulated wire cores when an external force is applied to the cable. Are evenly distributed and distributed, and metal fatigue due to partial bending of the insulated wire core can be prevented from being concentrated.

It is desirable to use a material that can withstand the heat during heat fusion as the covering material of the insulated wire core, and it is preferable to use a heat-resistant plastic-based material. The tube is preferably made of a flexible thermoplastic resin material.

Further, the tube may have a function of feeding air, oil, water, etc., as an interposition in the cable.

[0012]

FIG. 1 shows a preferred embodiment of a flat cable according to the present invention by a cross-sectional structure.

In the flat cable according to this embodiment, three composite cables C1, C2 and C3 having different structures are arranged side by side, and the sheaths 6 and 6 ', 6' and 6 "of adjacent cables are thermally fused to each other. Attaching: A hot-melt flat cable C having a composite structure is formed by hot-air fusion. (Hot-air fusion applies hot air to the fusion surface of the cable.
This means that the sheath is melted to such an extent that the sheath can be fused, and this is assembled into a flat shape and fused. The composite cable C1 on the left side of the drawing has thermoplastic resin tubes 5 (three) interposed along the valleys of the adjacent insulated wires 4 (three) of the insulated wires 4 that are twisted on a common axis. And the sheath 6 is pressed and covered with the bind tape 7 and the sheath 6 is extruded and covered on the outside.

The composite cable C2 shown in the center of the drawing has an insulated wire core 4 'around one thermoplastic resin tube 5'.
(6 pieces) are twisted, and the sheath 6 'is extruded and coated on the outside.

The composite cable C3 on the right side of the drawing has an insulated wire core 5 "around one thermoplastic resin tube 5".
(10 pieces), and a sheath 6 ″ is coated on the outside by extrusion coating.

In each cable, the insulated wire cores 4, 4 ',
For 4 ″, a heat-resistant plastic-based material that can withstand heat during heat fusion is preferably used as a coating material. Thermoplastic resin tubes 5, 5 ′, 5 ″ are used for extrusion coating and heat fusion. Sometimes, the heat insulation effect can be expected by keeping the inside of the tube hollow (while air is present). In addition, since the insulated wire cores 4 twisted together as described above function as a heat insulating material, any tube can be selected from a thermoplastic resin material, and the range of tube material selection is expanded. Can be

Each composite cable C1, C2, C3
The thickness of the sheath 6 is adjusted so as to have the same outer diameter, and the sheath 6 is arranged neatly when heat-sealed into a flat cable.

Each of the composite cables C1,
C2 and C3 are arranged vertically and horizontally symmetrically (vertically or horizontally symmetrically) in the twisted structure of the insulated wire core and the thermoplastic resin tubes 4 and 5, 4 'and 5', 4 "and 5". This makes it possible for the insulated wire core and the thermoplastic resin tube to be evenly applied to an external force, respectively. I try not to concentrate my fatigue.

Although the arrangement of the thermoplastic resin tube is basically free, the cables C2 and C3 at the center and right side in FIG.
As described above, the heat effect at the time of heat fusion can be further reduced and the effect of the heat insulating material is generated.

[0020]

According to the present invention as described above, without limiting the material of the tube to be combined with the insulated wire, the insulated wire and the tube are compactly combined to save space and reduce weight. It is possible to achieve the intended problem (object) of providing a flat cable having a composite structure of a heat fusion type, which can achieve the following.

The advantages of the flat cable according to the present invention are as follows. When a flat cable of a heat fusion type is formed by a composite structure of an insulated wire core and a tube, space saving and weight reduction can be achieved. The thermoplastic resin tube is disposed in the cable as an interposition, and the interposition can have a function such as fluid transport. The range of choice of tube material is expanded.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a flat cable according to the present invention.

FIG. 2 is an explanatory cross-sectional view showing an example of a conventional flat cable.

[Explanation of symbols]

 C Flat cable C1 Composite cable 4 Insulated wire core 5 Thermoplastic resin tube 6 Sheath 7 Bind tape C2 Composite cable 4 'Insulated wire core 5' Thermoplastic resin tube 6 'Sheath C3 Composite cable 4 "Insulated wire core 5" Heat 6 "sheath made of plastic resin

Claims (2)

[Claims] 1. A plurality of cables having a twisted structure of at least one insulated wire core and at least one thermoplastic resin tube are arranged in parallel, and adjacent cables are thermally fused to each other. A flat cable. 2. The flat cable according to claim 1, wherein the insulated wire core and the thermoplastic resin tube in the twisted structure are twisted and arranged so as to be vertically and horizontally symmetrical in a cross section.