JP4093441B2 - Tension member fixing bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tension member fixing bracket, for example, installed in a closure for drawing in an optical fiber cable, and can securely hold a tension member regardless of whether the number of tension members is one or two. Related to tension member fixing bracket.
[0002]
[Prior art]
Conventionally, a closure is installed in the wiring of the optical fiber cable, and the end of the optical fiber cable is accommodated. The optical fiber cable is usually composed of a 2-4 core optical cable and one or two tension members. When there is one tension member, it is called a center tension member, and the tension member is located at the center of the optical fiber cable. When there are two tension members, it is called a distributed tension member, and the tension members are located at both ends in the diameter direction of the cable. Thus, there are two types of optical fiber cables depending on the number of tension members.
[0003]
[Problems to be solved by the invention]
As described above, since there are two types of optical fiber cables in the arrangement of the tension members, the metal parts for fixing the tension members of the closure must also have two different structures. Conventionally, two types of them are prepared. In other words, a countermeasure was taken in which the fiber cable was used depending on the type of fiber cable.
As a result, there is a problem that the cost of the fixing member portion of the tension member is increased. FIG. 4 shows a conventional closure. 1 is a closure body, 2 is an end rubber packing, 3 is a cable fixing bracket base, 4 is a tension member fixing bracket, and 5 is an extra-length storage shelf.
[0004]
[Means for Solving the Problems]
Accordingly, in order to solve the above-mentioned problems, the invention of claim 1 forms a through hole for the central tension member along the central axis of the optical fiber cable, and forms a step portion for holding the distributed tension member at a symmetrical position. A cross-sectional hat-shaped block, a U-shaped pressing metal fitting fitted to the block so as to be movable up and down so that a tip end portion thereof can be brought into contact with the stepped portion, an insertion hole of the block, and a top portion of the block A screw hole formed therebetween, a through hole formed in the pressing metal fitting at a position corresponding to the screw hole, and a bolt screwed into the screw hole through the through hole.
[0005]
The invention of claim 2 is characterized in that, in the invention of claim 1, the stepped portion of the block has a concave shape upward.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a central tension member type optical fiber cable attached to an embodiment of the present invention.
In the figure, reference numeral 11 denotes a base portion, and a block 12 having a hat-shaped cross section is integrally formed at the front left end portion. A press fitting 13 having a U-shaped cross section is fitted to the upper portion of the block 12 so as to be movable up and down. An L metal fitting 14 is erected on the right end of the base 11 and the optical fiber cable 17 drawn into a closure (not shown) by the clamp pieces 15 and 16 pressing the optical fiber cable 17 from above and below. To fix.
[0007]
The outer cover of the optical fiber cable 17 fixed as a whole is peeled off, and the center tension member 18 is inserted into an insertion hole 19 formed at the center position of the block 12. The central tension member 18 inserted through the insertion hole 19 is clamped and fixed by bolts 20 and 21 screwed into screw holes formed through the block 12 from the top.
By fixing the central tension member 18 by the clamping pressure in the block 12 and fixing the optical fiber cable 17 by the clamp pieces 15 and 16, the optical fiber cable 17 is completely fixed to the closure.
[0008]
FIG. 2 is a perspective view when a dispersion tension member type optical fiber cable is attached to the embodiment of the present invention, and FIG. 3 is an enlarged view of a main part of FIG.
In FIG. 3, step portions 22 and 23 are formed on both sides of the block 12 at substantially the same level as the insertion hole 19. Further, the presser fitting 13 is fitted to the stepped portions 22 and 23 from above so as to be movable up and down, and the front end portions 24 and 25 of the presser fitting 13 are supported so as to be in contact with the stepped portions 22 and 23. . Screw holes 26 and 27 are formed in the block 12 from the top to the insertion hole 19, and bolts 20 and 21 are screwed.
[0009]
In addition, through holes 33 and 34 are formed at positions of the pressing metal 13 corresponding to the screw holes 26 and 27, and the bolts 20 and 21 are inserted therethrough. Thereby, the press fitting 13 is lowered by screwing the bolts 20 and 21.
Each part is the same as that shown in FIG. 1, and the distributed tension members 31 and 32 are attached instead of the center tension member 18 shown in FIG. That is, the entire optical fiber cable 28 is fixed by the clamp pieces 15 and 16, the outer skin is peeled off, the two dispersion tension members 31 and 32 are taken out, and the step portions 22 and 23 formed on both sides of the block 12, respectively. And the front end portions 24 and 25 of the pressing metal 13.
[0010]
Next, by tightening the bolts 20, 21, the tip portions 24, 25 of the press fitting 13 are lowered, and the dispersion tension members 31, 32 are sandwiched between the tip portions 24, 25 of the press fitting 13 and the step portions 22, 23. Press to fix.
The step portions 22 and 23 are formed in a curved surface that is concave upward so that the dispersion tension members 31 and 32 do not escape sideways.
[0011]
Here, when attention is paid to the bolts 20 and 21 and the pressing fitting 13, when the center tension member type optical fiber cable 17 is used, the center tension member 18 is inserted into the insertion hole 19. The lower end of the pin clamps and fixes the center tension member 18. At this time, the pressing metal 13 is not involved in the clamping pressure of the center tension member 18. Also, in the case of using the distributed tension member type optical fiber cable 28, by screwing the bolts 20 and 21, the pressing fitting 13 is lowered and the distributed tension members 31 and 32 are clamped and fixed on both sides.
[0012]
As described above, in the present invention, it is possible to fix two types of optical fiber cables, that is, the central tension member type optical fiber cable 17 and the dispersion tension member type optical fiber cable 28, although they are the same tension member fixing bracket. Is.
[0013]
【The invention's effect】
As described above, according to the present invention, since the optical fiber cable is a central tension member type or a distributed tension member type, it is fixed by the same tension member fixing bracket. It is not necessary to keep it, and costs can be reduced.
The present invention is applicable not only to the structure in which the optical fiber cable is introduced and fixed in the closure, but also to the case where the optical fiber cable is supported and fixed to various housings and support members.
[Brief description of the drawings]
FIG. 1 is a perspective view when a central tension member type optical fiber cable is attached to an embodiment of the present invention.
FIG. 2 is a perspective view when a dispersion tension member type optical fiber cable is attached to the embodiment of the present invention.
FIG. 3 is an enlarged view of a main part of FIG. 2;
FIG. 4 is a diagram showing a conventional example.
[Explanation of symbols]
11 Base portion 12 Block 13 Press fitting 14 L fitting 15, 16 Clamp piece 17 Optical fiber cable 18 Center tension member 19 Insertion hole 20, 21 Bolt 22, 23 Step portion 24, 25 Tip portion 26, 27 Screw hole 28 Optical fiber Cable 31, 32 Distributed tension member 33, 34 Through hole

Claims (2)

A cross section hat-shaped block in which a through hole for the central tension member is formed along the central axis of the optical fiber cable and a step portion for holding the dispersion tension member is formed in a symmetrical position;
A U-shaped pressing fitting that fits in the block so as to be movable up and down so that the tip can be brought into contact with the step;
A screw hole formed between the insertion hole of the block and the top of the block;
A through hole formed in the press fitting at a position corresponding to the screw hole;
A bolt screwed into the screw hole through the through hole;
A tension member fixing bracket characterized by comprising: In the tension member fixing bracket according to claim 1,
A tension member fixing metal fitting, wherein the stepped portion of the block has a concave shape.

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