JPH029462Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a composite cable that reliably integrates, for example, a power cable and an optical fiber, and that allows only the optical fiber to be easily separated near the end of the cable after installation. It is something.

(Background technology of the invention and its problems) Recently, so-called optical fiber composite power cables have been put into practical use, making full use of the characteristics of optical fibers, such as non-induction, no crosstalk, and low loss.

When designing this optical fiber composite power cable, it is necessary to ensure that even if external forces such as bending, tension, twisting, and kinking are applied to the cable, the optical fiber itself will not be subjected to strain exceeding the allowable limit.

Conventionally, as a composite cable that combines a so-called tribrex type cable, which is made by twisting three single-core power cables together, and an optical fiber, it is known that an optical fiber is arranged in the gap between the strands of the tribrex type cable. However, in such a configuration, since there is no integral sheath covering the entire outer periphery of the tribulex type cable, the optical fibers are not stably arranged in the twisting gap of the power line core.

Therefore, in this type of cable, there is a problem in that when the cable is bent, the optical fibers are ejected, and as a result, the ejected optical fibers are damaged during transportation or installation.

Therefore, as shown in FIG.
Apply adhesive 2 to the outer surface of the power line core 3.
A composite cable is provided that is adhered to the outer surface of the.

However, this type of composite cable has the disadvantage that adhesive strength cannot be maintained over a long period of time.

In addition, a method of wrapping a lashing wire around the outer periphery of a tribulex type cable and thereby restraining the optical fiber has also been tried, but this method has the disadvantage that the lashing wire breaks during the wire extension. Ta. Therefore, as shown in FIG. 3, the present applicant has developed a band-shaped linear object storage body in which both edge sides are made thicker than the central part, and a linear object 5 is embedded in one thickened edge side 4. 6 and three single-core power cables 3, one edge side of the linear object storage body 6 is in the twisting gap of the single-core power cable 3, and the other edge side 7
is arranged at the center of the twisting of the single-core power cables, and the central portion 8 is sandwiched between two single-core power cables, and the two single-core power cables are twisted together to provide a composite cable. (Utility Application No. 58-38905) By the way, in the composite cable of the above configuration, when separating the power cable 3 and the linear object storage body 6 near the cable end, the linear object storage body 6 is removed with a knife or the like. It is necessary to cut the wire, but when cutting with a knife or the like, it is difficult to form the cut surface in a straight line, and there is also the problem that the appearance of the linear object 5 after cutting is poor.

(Purpose of the invention) The present invention was made with attention to these points, and it integrates the tributux type cable and the optical fiber over a long period of time, and furthermore, it is possible to integrate only the optical fiber near the cable end after installation. The object is to provide a composite cable that can be easily separated.

(Summary of the invention) In this invention, the length between the optical fiber buried part and the center part of a band-shaped optical fiber storage body is made by making both edges thicker than the center part and embedding an optical fiber in one of the thickened edges. The above object is achieved by forming a constriction along the direction.

(Embodiment of the invention) Hereinafter, the invention will be described based on the drawings of one embodiment.

1 with the same numbers attached to the same parts as in Figures 2 and 3.
In the figure, a single-core power cable 3 has an insulating layer 10 made of cross-linked polyethylene or the like on a conductor 9 via an internal semiconducting layer (not shown) if necessary, and an external semiconducting layer (not shown) on top of this if necessary. ) A sheath 11 made of vinyl or the like is provided with a sheath layer (not shown) interposed therebetween.

As shown in FIG. 4, the strip-shaped linear object storage body 6' is made thicker at both edges than at the center, and a linear object 5 made of optical fiber, copper wire, control wire, etc. is buried in one thickened edge side. has been done.

A constricted portion 12 is formed in the length direction between one edge side 4' and the central portion 8' of the linear object storage body 6', preferably near the area where the linear object is buried, and the other edge side 7' The wall thickness of the center portion 8' is approximately 0.8 to 1.0 mm, and is thicker than that of the center portion 8', and is dimensioned so that it can be placed at the center of the strand of the tribucle cable.

Note that the linear object storage body 6' and the constricted portion 12
is easily formed by extrusion processing of rubber or plastic materials such as vinyl or polyethylene.

Next, a method for manufacturing a composite cable will be described. That is, three single-core power cables 3,
One edge 4' of the linear object storage body 6', that is, the part where the optical fiber or other linear object is stored, is the twisting gap, and the other edge 7' is the twisting center of the tribulex cable. First, the central portion 8' is sandwiched between two power cables 3 and twisted together.

(Effects of the invention) As described above, in the invention, the central part of the linear object storage body is sandwiched between two power cables, and the other edge is always located at the center of the tributary cable twist. This makes it possible to reliably integrate power cables and linear objects such as optical fibers over their entire length.Furthermore, constrictions are formed at predetermined locations in the linear object storage, making it easy to separate linear objects. This can be done easily and in a short time, and the cut surface of the linear object is in a straight line and has a good appearance.

Therefore, in the present invention, even when the cable is bent, a wire-like object such as an optical fiber does not come out unlike in the prior art, and it is possible to provide a composite cable that can prevent damage to the wire-like object.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of the composite cable of the present invention, Figs. 2 and 3 are schematic cross-sectional views of a conventional composite cable, and Fig. 4 is a schematic cross-sectional view of the composite cable of the present invention. FIG. 3... Single-core power cable, 6, 6'... Linear object storage, 5... Linear object, 4, 4'... One edge side, 7,
7'...Other edge side, 11, 11'...Central part, 12
...The waist part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A belt-shaped linear object storage body with both edges thicker than the center and a linear object buried in one of the thickened edges, and a three-strand single-core power cable. , one edge side of the linear object storage is arranged in the gap between the twisted single-core power cables, the other edge side is arranged in the center of the twisted single-core power cables, and the central part is sandwiched between the two single-core power cables. What is claimed is: 1. A composite cable comprising: a constricted portion extending in the length direction between a portion where a linear object is buried and a central portion of the linear object storage body; 2. The composite cable according to claim 1, wherein the linear object is an optical fiber.