JP2536077Y2 - Termination of optical cable - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to the termination of an optical cable,
In particular, the present invention relates to a termination portion of an optical cable in which a tension member clamp can be easily attached and stable and strong fixation is possible.

[0002]

2. Description of the Related Art Conventionally, in processing an end portion of an optical cable, a slot 1 is exposed at an end portion of the optical cable as shown in FIG.
Is removed, the internal tension member 2 is pulled out, and the cylindrical portion 3a of the tension member clamp 3 is fitted into the exposed tension member 2a. The member clamp 3 was fixed. The end of the optical cable is attached to a desired position by using the threaded portion 3b on the free end side of the tension member clamp 3.

[0003]

However, in the case of the above-described termination processing of the optical cable, there are the following problems. (1) First, it was quite troublesome to remove all of the slot 1 except for the tension member 2. In particular, when the slot material is made of soft polyethylene or the like, it is not so much, but when the same polyethylene is used for a hard material or another hard slot material, it is extremely difficult to completely remove all of the slot material. In particular, in the removal of a hard slot material, when cutting with a blade, there is a possibility that the tension member 2 may be damaged, and there is a problem that the strength of the tension member 2 is reduced. (2) Further, such slot material removal and the above-mentioned compression work of the tension member clamp 3 are performed as follows.
The operation must be performed while avoiding a large number of optical fibers F such as a tape type protruding from the optical fiber storage groove 1a of the slot 1, and the operation is difficult and difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional situation, and is characterized in that a tension member is buried in an internal longitudinal direction and an optical groove is formed in an outer groove. In an optical cable having a slot in which a fiber is accommodated, a convex portion of the groove portion at the end of the slot from which the optical fiber is exposed is removed, and a tension member clamp is fixed to the end of the grooveless slot. At the end of an optical cable designed to be carried out by a fixing device such as a screw.

[0005]

According to the present invention, the tension members are not removed by removing the entire slot but by removing only the projections of the slot groove portions and fixing the tension member clamps to these portions. In addition, the slot removing operation is greatly simplified. Also, when a fixing tool such as a screw is used, the tension member clamp can be easily fixed, and an integrated and stable fixing can be obtained.

[0006]

FIG. 1 shows an embodiment of an optical cable termination according to the present invention. In the figure, 11 is an optical cable terminal, 12 is a slot from which an optical fiber F such as a tape as a core wire is led out, and 13 is this slot 1
2, a tension member buried in the longitudinal direction, 14 is a grooveless slot end obtained by removing the groove portion of the slot 12, 15 is a tension member clamp fixed to the grooveless slot end 14, and 16 is an optical cable. Terminal 1
1 is a case having a spacer 17 on the outer peripheral side and comprising a cylindrical body, a polygonal body, or the like covering the entire optical cable termination.

[0007] In the processing of the optical cable termination, first, the sheath (such as a sheath) of the optical cable terminal 11 is removed and exposed to expose the slot 12 together with the optical fiber F. Pull out to length. Next, avoiding the optical fiber F, as shown in FIG. 2, for example, the left and right convex portions 12b forming the optical fiber storage groove portion 12a of the exposed slot 12 are removed by shaving or the like. Then, as shown in FIG.
A grooveless slot end 14 having a slightly reduced diameter (diameter corresponding to the depth of the groove) is formed. At this time, the slot material can be removed only at the protruding portion 12a of the groove 12a, so that even if the slot material is a hard material, it can be easily performed.

After that, the tension member clamp 15 is fixed to the groove-free slot end portion 14. The tension member clamp 15 is, for example, one as shown in FIG. The tension member clamp 15 is made of metal or the like, and has a fixing portion 15a formed of a cylindrical body on the side of the groove-free slot end 14 side. The fixing portion 15a is fitted into the groove-free slot end 14 and the portion It is fixed by a fixing tool 18 such as a screw through a through hole 15b formed in advance. At this time, the screwing position of the fixing tool 18 may be such that the fixing tool 18 is screwed not only in the vertical direction in FIG. This results in a stable fixation. In addition, since the fixing is performed by the screw-in method, the optical fiber F that is led out can be easily performed without much hindrance. Furthermore, since the fixing is performed not to the thin inner tension member 13 but to the thick slot portion having a slightly reduced diameter, stable and strong fixing can be obtained.

On the other hand, the tension member clamp 15
A screw portion 15e is formed near the tip of the shaft portion 15c on the side opposite to the fixing portion 15a, and the screw portion 15e is made to pass through the through hole 16a at the rear end of the case 16, and the penetrated case If a fixing tool 19 such as a nut is screwed and fixed to the outer screw portion 15e, a desired end portion of the optical cable is obtained.

In order to attach the terminating end of the optical cable to a necessary portion, for example, the projecting screw portion 15e of the tension member clamp 15 may be used, or an attachment may be attached to the case 16 itself. .
Needless to say, the drawn optical fiber F may be drawn out to the outside through the through hole 16b for drawing out the optical fiber at the rear end of the case 16 if necessary. When the optical fiber F is drawn out from the middle of the cable before the cable termination, the optical fiber F is not required to be pulled out at the termination, and the tension member clamp 15 and the case 16 are not required.
It is also possible to fix only by the following.

Further, the tension member clamp 15 used in the present invention is not limited to those shown in FIGS. 1 and 4 as long as it can be attached to a slot portion. For example, as shown in FIG. 25 or the like. The tension member clamp 25 is basically the same as the tension member clamp 15, except that the fixing portion 25a is composed of two divided members.

[0012]

As is apparent from the above description, according to the termination of the optical cable according to the present invention, the following effects can be obtained. (1) First, when attaching the tension member clamp to the slot, only the protrusion of the slot groove needs to be removed, so that the workability is good. In particular, even when the slot material is hard, it can be easily performed. (2) Since the tension member clamp is fixed to the relatively thick groove-free slot end from which the protruding portion of the slot groove has been removed, stable and strong fixing can be obtained. That is, instead of being fixed with a thin tension member as in the related art, the end portion is supported by the entire optical cable, so that it is extremely resistant to bending and the like. (3) In the case where the tension member clamp is fixed by a fixing tool such as a screw, the drawn optical fiber can be easily performed without much hindrance. In other words, in the case of the conventional compression fixing, it is necessary to compress and deform the entirety of the tension member clamp cylindrical portion by means of a pinching means such as pliers. Although it is necessary, in the case of the screw-in type, it is only necessary to use a tool such as a screwdriver having a thin point and to avoid only the optical fiber at the tip of the screw-in, so that the work is easy. In particular, this becomes remarkable when the number of optical fibers increases.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing one embodiment of a termination part of an optical cable according to the present invention.

FIG. 2 is an end view showing a slot of an optical cable and an optical fiber housed in a groove of the slot.

FIG. 3 is a side view showing a state in which an optical fiber of an optical cable is led out and a groove of a slot is removed to form a grooveless slot end.

FIG. 4 is a perspective view showing a tension member clamp used in the optical cable termination of FIG. 1;

FIG. 5 is a perspective view showing another tension member clamp.

FIG. 6 is a partial vertical sectional view showing a termination portion of a conventional optical cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Optical cable terminal, 12 slot, 12a groove, 12b convex, 13 tension member, 14 groove-free slot end, 15 tension member clamp, 16 case, 17 spacer, 18 fixture, 19 fixture, 25 tension member clamp, F Optical fiber,

Claims (2)

(57) [Scope of request for utility model registration] 1. An optical cable having a slot in which a tension member is buried in an internal longitudinal direction and an optical fiber is housed in a groove on the outer periphery, wherein the convex portion of the groove portion at the slot end where the optical fiber is led out. A terminated end of the optical cable, wherein the tension member clamp is fixed to the end of the grooveless slot. 2. The tension member clamp according to claim 1, wherein said tension member clamp has a fixing portion formed of a cylindrical body or a divided member at least on the end portion of said grooveless slot, said fixing portion being fitted into said grooveless slot end portion, and said fixing portion being fitted. 2. The optical cable termination according to claim 1, wherein the optical cable is fixed by a fixture.