JPS6046511A - Supporting method of optical fiber cable - Google Patents

Abstract

PURPOSE:To prevent unreasonable force from operating upon the optical fiber in an optical fiber cable by fitting a couple of supports and a tubular member around the optical fiber cable at a desired position, and thus attaching the tubular member. CONSTITUTION:The couple of supports 12 and 13 and heat-shrinkable tube 14 are fitted around the optical cable 11 from the end parts, and the heat-shrinkable tube 14 is attached to the outer circumferential surface of the cable 11 at the specific position where the cable 11 is expected to be supported by heating and shrinking the tube. Then, the 1st support 12 is put closer from one side to store the tube 11 in its recessed hole 15. The external surface of the end part is threaded into a male screw 16, and the 2nd support 13 is also put closer from the other side to engage the male screw threadably with the female screw threaded in the internal circumference of the end part, clamping them. Consequently, excessive clamping force is prevented from operating on the optical cable.

Description

[Detailed description of the invention] (1) Technical field of the invention The present invention relates to a method for supporting an optical fiber cable.

(2) Prior art and problems When an optical fiber cable is stretched and laid, it must be fixed and supported at key points. Especially the bulkhead.

Appropriate support is required when penetrating partitions, etc.

In the case of electric wire cables, it is also possible to insert a metal tube into the inner surface of the sheath from the end of the sheath where the core wire is branched and pulled out, and press and fix this tube section from the outside of the sheath, but the part where the tube is inserted is It is not an arbitrary location, but it must be limited, and the inner surface of the jacket must have a space into which the tube can be inserted.

In addition, as shown in the perspective view of FIG. 2 and the cross-sectional view of FIG. The locking claw 6 is engaged with the recess 7 of the main body 1. In this way, as shown in FIG. 4, the cable 8 is curved and pressed against the bottom surface 9 of the concave portion of the main body 1 and fixed, preventing movement in the length direction and being supported by the support.

Although such local pressing force and deformation are permissible in the case of electric wire cables, they are not preferable in the case of optical fiber cables because they cause damage to the optical fiber core wire and optical transmission loss.

(3) Purpose of the Invention In view of the above problems, the present invention provides a method for supporting an optical fiber cable in which no excessive force is applied to the internal optical fibers.

(4) Structure of the Invention The gist of the structure of the method of the present invention for achieving the above object is to attach a tubular member to the outer peripheral surface of an optical fiber cable, and insert the optical fiber cable from both axial directions of the tubular member. This is achieved by supporting the optical fiber cable by joining a pair of supports that have four holes that accommodate the outer peripheral surface of the tubular member and are in contact with both end surfaces of the tubular member.

(5) Examples of the invention The method of the present invention will be explained below using specific examples.

FIGS. 5 to 7 show an embodiment of the method of the present invention. In the figure, reference numeral 11 denotes an optical fiber cable, and a pair of supports 12. ．． 1'3 and the heat-shrinkable tube 14 is inserted between them, and the optical fiber cable 11
At a predetermined position where the cable 11 is to be supported, the heat-shrinkable tube 14 is heated and contracted by means not shown, and is attached in close contact with the outer peripheral surface of the cable 11.

This heat-shrinkable tube 14 may be made of an ordinary adhesive.
More preferably, an adhesive is used. This is not necessarily limited to a heat-shrinkable tube, but may also be a tube made of a metal-2 synthetic resin material.

The heat-shrinkable tube 11 in the contracted state has a tubular shape and is firmly fixed to the optical fiber cable.

The first support 12 is brought in from one side, and its recessed hole 15 is
A tubular tube 11 is housed inside. A male thread 16 is carved on the outer surface of the end, and a second support 1 is connected from the other side.
3 and screw together with a collar 17 carved on the inner periphery of the end.

Both ends 18,19 of the tubular tube 11 are connected to the first support 1
2 and the step 21 of the large bottom of the female thread 17 of the second support 13, so that both supports and the optical fiber cable cannot move relative to each other in the axial direction. It will no longer be allowed. Further, the outer periphery is regulated to fit into the inner peripheral surface of the recessed hole 15 .

Both outer ends of the support 12.13 are tapered and beveled;
Since this support is made of a synthetic resin having appropriate hardness and elasticity, the inclination has a favorable effect on the bending of the optical fiber cable at the end, ie, prevents local sharp bending from occurring. However, it is not necessarily limited to this, and includes hard materials and metal materials.

It may also be used in combination with a protective film material.

The above state is shown in FIG. However, support comes first.
．． The second support body may be fitted with a support plate or a wall surface 3o having holes into which the screws 16 are fitted, and the second support body may be clamped and supported, resulting in an appearance similar to that shown in FIG.

In addition, a flange 22 as shown by the chain line in FIG. 7 is provided on one of the supports, and this flange 22 is used for support.
It can also be supported and fixed using.

(6) Effects of the Invention As described above, according to the method of the present invention, the optical fiber cable is easily supported and fixed by inserting the pair of supports and the tubular member into the desired location of the optical fiber cable and attaching the tubular member. In addition, it is extremely practical as excessive tightening and bending will not be applied to the optical fiber, and it is also an excellent support method from a cost standpoint as it is easy to install and requires a small number of parts. .

The optical fiber cable used in the method of the present invention refers to a single-core optical fiber cord, a cable including a plurality of optical fibers, a cable equipped with electric wires, etc.

[Brief explanation of drawings]

FIG. 1 is an example of an external appearance in a supported state, FIGS. 2 to 4 are an exploded perspective view, an assembly explanatory view, and an assembly sectional view of a conventional method, and FIGS. 5 to 7 are an explanation of an embodiment according to the method of the present invention. It is a diagram. In the figure, 11 is an optical fiber cable, 12 is a first support, 13 is a second support, and 14 is a heat-shrinkable tube.

Claims (1)

[Claims] A method for supporting a recessed optical fiber cable, which comprises: attaching a tubular member to the outer circumferential surface of the optical fiber cable; and inserting the optical fiber cable from both axial directions of the tubular member to accommodate the outer circumferential surface of the tubular member.