JPH056539U - Flat cable - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flat cable capable of preventing peeling between an insulator and a sheath layer. [Structure] A plurality of conductors 11 are arranged in parallel and adjacent to each other. So that the entire circumference of the conductor 11 is encased together,
An insulator 12 made of crosslinked polyethylene is extrusion-coated. A plurality of groove portions 13 are continuously formed on the circumferential surface of the insulator 12 along the longitudinal direction of the insulator 12 over the entire length of the insulator 12. The cross-sectional shape of the groove 13 is such that the width of the opening is larger than the maximum width of the internal space. A sheath layer 14 formed by extrusion coating with vinyl chloride is formed on the peripheral surface of the insulator 13 in which the groove portion 13 is formed.
When the resin is extrusion-coated, the resin penetrates into the groove portion 13 and a protrusion 15 is formed on the inner surface of the sheath layer 14 in a shape corresponding to the groove portion 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flat cable.

[0002]

[Prior Art]

 BACKGROUND ART In recent years, flat cables have been widely used as power cables laid in buildings because of the demand for space saving wiring. In such a flat cable, for example, as shown in FIG. 4, the circumferential surfaces of a plurality of conductors 31 arranged in parallel and adjacent to each other are bundled together by an insulator 32 made of an insulating material such as cross-linked polyethylene. Extrusion coated. Further, a sheath layer 33 made of a resin such as vinyl chloride resin is extrusion-coated on the periphery of the insulator 32.

[0003]

[Problems to be solved by the device]

 However, in the conventional flat cable 30 described above, the interface between the insulator 32 and the sheath layer 33 is not adhered or fused so that the sheath layer 33 can be easily peeled off. Therefore, when the flat cable 30 is bent in the horizontal direction with respect to the longitudinal direction, the flat surface portion of the sheath layer 33 bulges outward, and even if the flat cable 30 is returned to its original state, the surface of the sheath layer 33 does not change. Remains raised, and a void 41 is formed between the insulator 32 and the sheath layer 33, as shown in FIG. As a result, there was a problem that the appearance of the flat cable became poor and the product value decreased.

The present invention has been made in view of the above point, and when the flat cable is deformed, peeling occurs between the insulator and the sheath layer, resulting in a space between the insulator and the sheath layer. A flat cable that can be easily prevented from occurring.

[0005]

[Means for Solving the Problems]

 The present invention is a flat cable comprising an insulator enclosing a peripheral surface of a plurality of conductors arranged in parallel and adjacent to each other, and a sheath layer covering the peripheral surface of the insulator. A groove is formed on the peripheral surface of the body so that the maximum width of the internal space is larger than the width of the opening, and a protrusion extending in a shape corresponding to the groove is formed on the inner surface of the sheath layer. It is a flat cable characterized in that.

[0006]

[Action]

 The flat cable of the present invention has a structure in which the groove formed on the peripheral surface of the insulator is fitted with the protrusion formed on the inner surface of the sheath layer and extending in a shape corresponding to the shape of the groove. There is. As for the shape of the groove, the maximum width of the internal space is larger than the width of the opening, so that the protrusion is difficult to pull out, and the sheath layer is firmly fixed to the insulator. Therefore, when the flat cable is deformed, peeling between the insulator and the sheath layer can be almost completely prevented.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of the flat cable of the present invention. A plurality of conductors 11 are arranged in parallel and adjacent to each other. For example, a cross-linked polyethylene insulator 12 is extrusion-coated so as to enclose all the peripheral surfaces of the conductors 11 collectively. A plurality of groove portions 13 are formed on the peripheral surface of the insulator 12 along the longitudinal direction of the insulator 12. The groove 13 may be continuously formed over the entire length of the insulator 12, or may be intermittently formed with a predetermined length.

The cross-sectional shape of the groove 13 may be any shape as long as the width of the opening is larger than the maximum width of the internal space. The groove 13 has, for example, a trapezoidal shape in which the width b of the bottom is larger than the width a of the opening as shown in FIG. Further, as shown in FIG. 3, it may have a substantially circular shape having a diameter y larger than the width x of the opening. The maximum width of the internal space (indicated by b in FIG. 2 and y in FIG. 3) is preferably at least 2 mm larger than the width of the opening (indicated by a in FIG. 2 and x in FIG. 3). The depth of the groove portion 13 (indicated by d in the figure) is preferably in the range of 0.2 to 3.0 mm.

A sheath layer 14 formed by extrusion coating a resin such as a vinyl chloride resin or an ethylene resin is formed on the peripheral surface of the insulator 13 in which the groove portion 13 is formed as described above. When the resin is extrusion-coated, the resin penetrates into the groove portion 13 and a protrusion 15 extending in a shape corresponding to the groove portion 13 is formed on the inner surface of the sheath layer 14. As a result, a structure is obtained in which the projection 15 is fitted in the groove 13.

In the flat cable 10 having such a configuration, since the groove 13 has the maximum width of the internal space larger than the width of the opening, the projection 15 formed inside is very difficult to be pulled out, and the sheath The layer 14 is firmly attached to the insulator 12. Accordingly, it is possible to substantially completely prevent peeling between the insulator 12 and the sheath layer 14 when the flat cable 10 is deformed during installation. As a result, it is possible to prevent the flat portion of the sheath layer 14 from being deformed outwardly to form a void between the insulator 12 and the sheath layer 14. As a result, the appearance of the flat cable 10 can always be maintained in an excellent state and the product value can be improved.

[0012]

[Effect of the device]

 As described above, according to the flat cable of the present invention, peeling between the insulator and the sheath layer can be substantially completely prevented by the simple structure. As a result, the flat cable can be maintained in an excellent appearance and the product value can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a flat cable of the present invention.

FIG. 2 is a cross-sectional view showing an example of a groove portion formed on the peripheral surface of the insulator of the embodiment.

FIG. 3 is a cross-sectional view showing another example of the groove portion formed on the peripheral surface of the insulator of the embodiment.

FIG. 4 is a sectional view showing a conventional flat cable.

FIG. 5 is a cross-sectional view showing a state in which an appearance defect has occurred in a conventional flat cable.

[Explanation of symbols]

10 ... Flat cable, 11 ... Conductor, 12 ... Insulator,
Reference numeral 13 ... Groove portion, 14 ... Sheath layer, 15 ... Protrusion portion.

Claims (1)

[Claims for utility model registration] 1. An insulator covering the peripheral surfaces of a plurality of conductors arranged in parallel and adjacent to each other, and a sheath layer covering the peripheral surfaces of the insulators. A flat cable, wherein a groove is formed on the peripheral surface of the insulator in a shape in which the maximum width of the internal space is larger than the width of the opening, and the groove extends on the inner surface of the sheath layer in a shape corresponding to the groove. A flat cable characterized by having a protrusion.