JP2001249232A - Tension member fixing fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve troublesomeness for preparing tension member fixing fittings different in accordance with the kind of a tension member. SOLUTION: A block 12 having a hat shaped cross section wherein tension member inserting hole 19 is formed at the center along the central line of an optical fiber cable drawn into a closure and step parts 22, 23 holding distributing tension members are formed respectively in the left and right positions both symmetrical to the center line, a pressing fitting 13 having a U shaped cross section fitted on the block 12 so as to vertically move so that tip end parts 24, 25 abut on the step part 22, 23, threaded holes 26, 27 formed between the inserting hole 19 of the block 12 and the apex of the block 12, through hole 33, 34 formed in the pressing fitting 13 in the position corresponding to the threaded holes 26, 27 and bolts 20, 21 screwed into the threaded holes 26, 27 via the through holes 33, 34 are prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for fixing a tension member. The present invention relates to a tension member fixing bracket that can be securely held.

[0002]

2. Description of the Related Art Conventionally, in optical fiber cable wiring,
A closure is installed to house the end of the fiber optic cable. The optical fiber cable usually includes an optical cable having 2 to 4 cores 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, the tension members are referred to as dispersion tension members, 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]

As described above, since there are two types of optical fiber cables in the arrangement of the tension members, the metal fittings for fixing the tension members of the closure must have two different structures. Conventionally, a method has been adopted in which two types are prepared and used depending on the type of fiber cable. As a result, there has been a problem that the cost of the fixing bracket portion of the tension member increases. FIG. 4 shows a conventional closure. 1 is a closure main body, 2 is an end face rubber packing, 3 is a cable fixing metal pedestal, 4 is a tension member fixing metal, and 5 is an extra-long storage shelf.

[0004]

In order to solve the above-mentioned problems, the invention of claim 1 is to form an insertion hole for a center tension member along a center axis of an optical fiber cable and disperse the hole in a symmetrical position. A block having a hat-shaped cross-section having a step for holding a tension member, a pressing metal fitting having a U-shaped cross-section which is vertically movably fitted to the block so that a tip end thereof can contact the step, and the block A screw hole formed between the insertion hole and the top of the block, a through hole formed in the press fitting at a position corresponding to the screw hole, and a bolt screwed into the screw hole through the through hole. It is characterized by having.

According to a second aspect of the present invention, in the first aspect of the present invention, the step portion of the block has an upwardly concave shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a case where an optical fiber cable of a center tension member type is attached to an embodiment of the present invention. In the figure, reference numeral 11 denotes a base, and a block 12 having a hat-shaped cross section is integrally formed at the left end on the front side. A press fitting 13 having a U-shaped cross section is fitted to the upper part of the block 12 so as to be vertically movable. At the right end of the base 11, an L bracket 14 is erected, and the clamp 1
5 and 16 press the optical fiber cable 17,
An optical fiber cable 17 drawn into a closure (not shown) is fixed.

Optical fiber cable 17 fixed as a whole
The cover is peeled off, and the center tension member 18 is inserted into the insertion hole 19 formed at the center position of the block 12. Center tension member 1 inserted through insertion hole 19
8 is pinched and fixed by bolts 20 and 21 screwed into screw holes formed through the block 12 from the top. The fixing of the center tension member 18 by the clamping force in the block 12 and the fixing of the optical fiber cable 17 by the clamp pieces 15 and 16 completely fix the optical fiber cable 17 to the closure.

FIG. 2 is a perspective view showing a case where an optical fiber cable of a dispersion tension member type 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. The press fitting 13 is fitted to the steps 22 and 23 from above so as to be vertically movable, and the distal ends 24 and 25 of the press fitting 13 are connected to the step 2.
2 and 23 are supported so that contact is possible. 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 therein.

Further, through holes 33 and 34 are formed at positions of the press fitting 13 corresponding to the screw holes 26 and 27, and bolts 20 and 21 are inserted. Thereby, the screw 13 is lowered by screwing the bolts 20 and 21. The components are the same as those shown in FIG. 1, and instead of the central tension member 18 in FIG.
1, 32 are attached. That is, the entire optical fiber cable 28 is fixed by the clamp pieces 15 and 16, the outer skin is peeled off, and the two dispersion tension members 3 are removed.
Steps 22, 23 formed on both sides of the block 12 and the distal end 2 of the pressing fitting 13, respectively.
4 and 25.

Next, the bolts 20 and 21 are tightened to lower the distal ends 24 and 25 of the pressing hardware 13, and the dispersion tension members 31 and 32 are moved to the distal ends 24 and 25 and the steps 22 and 23 of the pressing hardware 13. Press and fix with.
Note that the step portions 22 and 23 are provided with the dispersion tension members 31 and
32 is formed in an upwardly concave curved surface so as not to escape sideways.

Attention is now paid to the bolts 20 and 21 and the press fitting 13. When the center tension member type optical fiber cable 17 is used, the insertion hole 19 is used.
Since the center tension member 18 is inserted through the center tension member 18, the lower ends of the bolts 20 and 21 press and fix the center tension member 18. At this time, the press fitting 13 is not involved in the pressing of the center tension member 18. When the dispersion tension member type optical fiber cable 28 is used, the bolts 20 and 21 are screwed into the pressing fitting 13.
Is lowered to pinch and fix the dispersion tension members 31 and 32 on both sides.

As described above, according to the present invention, the two types of optical fiber cables, the central tension member type optical fiber cable 17 and the dispersion tension member type optical fiber cable 28, are fixed while using the same tension member fixing bracket. It is made possible.

[0013]

As described above, according to the present invention, whether the optical fiber cable is of the center tension member type or the dispersion tension member type, the optical fiber cable is fixed by the same tension member fixing metal. It is not necessary to prepare two types, and the cost can be reduced. The present invention is applicable not only to a structure in which an optical fiber cable is introduced and fixed in a closure, but also to a case in which an optical fiber cable is supported and fixed in various housings and supporting members.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a case where an optical fiber cable of a center tension member type 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]

 Reference Signs List 11 base part 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 stepped part 24, 25 tip part 26, 27 screw hole 28 optical fiber Cable 31, 32 Dispersion tension member 33, 34 Through hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsumi Miyazawa 1-2-2, Oshima, Koto-ku, Tokyo Co., Ltd. Shoden Inside (72) Inventor Hiroki Furuya 1-2-2, Oshima, Koto-ku, Tokyo Shares Company Shodennai F-term (reference) 2H036 RA14 RA23 2H038 CA37 CA38 5G375 AA18 CD04

Claims (2)

[Claims] 1. A hat-shaped block in which a central tension member insertion hole is formed along a central axis of an optical fiber cable, and a step portion for holding a dispersion tension member is formed at symmetrical positions. A press fitting having a U-shaped cross section, which is vertically movably fitted to the block so as to be able to contact the step portion; a screw hole formed between an insertion hole of the block and a top of the block; A tension member fixing bracket, comprising: a through hole formed in the press fitting at a position corresponding to (b); and a bolt screwed into the screw hole through the through hole. 2. The tension member fixing bracket according to claim 1, wherein the step of the block has a concave shape upward.