JPS638705A - Method for wiring photoconductor in optical cable - Google Patents

Abstract

PURPOSE:To effectively use an empty slot by inserting a separately prepared photoconductor through the empty slot, from which a photoconductor is drawn out, to extend an optical fiber wiring network. CONSTITUTION:A sheath 3 is cut round and removed at a photoconductor branch point 7 by a knife or the like to expose a photoconductor 6 to be branched, and the sheath 3 of an optical cable 1 is cut round and removed in a position 8, from which the distance to the branch point 7 is at least equal to the length of a photoconductor connection work excess length part 6a, to cut the photoconductor 6 to be branched. The excess length part 6a is drawn out from the branch point 7 to the outside of the cable and is branched and is connected to a photoconductor 10 for local wiring by a connector 8. The second photoconductor 12 is inserted through an empty slot 5a, which is made empty when the photoconductor connection work excess length part 6a is drawn out of the cable, from one end to the other. The photoconductor is effectively used for connection between a specific terminal machine and another terminal machine installed apart from said terminal machine or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an optical cable, and particularly to a method for wiring a guide member in a pullable optical cable using a slot-type spacer.

<Prior art> As a guide wire wiring method for a pull-out optical cable using a slot-type spacer, after the optical cable is laid, in order to branch the optical conductor for adding terminal equipment, etc., the optical conductor is separated by the extra length for connecting the optical conductor. In one embodiment, the cable sheath is removed and the light guide to be branched is cut, and at the branching point, the cable jacket is removed and the light guide to be branched is pulled out from the slot of the spacer, and the light guide for local wiring is removed. A method of connecting with a conductor is known.

<Problems to be Solved by the Invention> In the conventional technology, the four light beams to be split are pulled out (thereby, an empty spacer slot is created in that part, but the empty slot is not used equally).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for wiring a guide in an optical cable that effectively uses the empty slot after the light guide is pulled out.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a means for solving the problems described above, in which the light guide is removably accommodated in a slot on the outer periphery of a spacer at a light guide branch point of the optical cable. removing the outer sheath of the optical cable to expose the light guide to be branched; and removing the outer sheath of the optical cable and cutting the light guide to be branched at a position away from the branch point by at least an extra light guide connection length. a step of drawing out the extra length of the light guide to be branched from the branch point to the outside of the cable; and a step of inserting another light guide into the empty slot formed by drawing out the light guide. Ta.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 2 is a cross-sectional view of an optical cable according to an embodiment of the present invention. The spacer 2 of the optical cable 1 shown in this figure is made of a rod-shaped plastic material with a circular cross section, and its outer periphery is covered with a jacket 3 of a plastic tube. A reinforcing wire 4 is buried in the center of the spacer 2, and four slots 5 are formed in the outer periphery. A light guide 6 is removably housed in each slot 5.

In the optical cable 1 having the above configuration, a case where the optical conductor 6 is used in a branched manner will be described. In FIG. 1, first, at the light guide branching point 7 where the light guide is to be branched, the outer sheath 3 is removed by cutting with a knife or the like to expose the light guide 6 to be branched. Further, the outer jacket 3 of the optical cable 1 is sliced and removed at a position 8 away from the branch point 7 by at least the extra length 6a for the light guide connection work, and the light guide 6 to be branched is cut. Then, the extra length portion 6a is pulled out from the branching point 7 to the outside of the cable, and is branched and connected to the optical conductor 10 for local wiring by the connecting device 9.

FIG. 3 shows an example of a loop-shaped wiring structure formed according to the branching method. That is, this is an example in which five terminals all (ae) are connected in a loop by four light guides 6.

On the other hand, as described in FIG.
When a is pulled out to the outside of the cable, an empty slot 5a is created at that portion, and the second optical conductor 12 is inserted through this empty slot 5a from one end to the other.

The light guide 12 is, for example, as shown in FIG.
It is effectively used to connect a specific terminal 11d to a terminal 13 of another system installed at a position further away from the specific terminal 11d.

By the way, as mentioned above, the light guide 12 is inserted into the empty slot 5a.
If the optical fiber 12 is a single-core optical fiber that is easy to bend, a warhead 14 for sliding is attached to the tip of the optical fiber 12, as shown in FIG. Wire rod 1 for buckling prevention along 12
5 is stretched.

Furthermore, if the light guide 12 is an optical fiber unit consisting of a plurality of optical fiber core wires bundled around a reinforcing wire, as shown in FIG. Therefore, only the warhead 14 for the insertion guide is attached.

Note that, as shown in FIG. 1, the slot 5 is linear along the cable axis, but instead of this linear slot, a spiral slot may be used.

<Effects of the Invention> As is clear from the above description, according to the method for wiring a guide for an optical cable according to the present invention, in the method for wiring a guide for a pull-out type optical cable using a slot-shaped spacer, the optical conductor is pulled out. It is possible to effectively utilize the empty slots by inserting a separately prepared optical guide into the latter empty slots and expanding the optical fiber wiring network.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing a branched state of an optical cable according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the optical cable, and FIG. 3 is a schematic diagram showing the state of wiring of the optical cable's guide body.
Figure 4! a1. (bl is the oblique opening of the guide body insertion means. ■... Optical cable, 2... Spacer, 3... Outside wave, 5... Slot, 5a... Empty slot, 6...
Light guide, 6a... Extra length for light guide connection work, 7... Light guide branch point, 12... Light guide for expansion.

Claims (1)

[Claims] (1) removing the jacket of the optical cable at a light guide branching point of the optical cable in which the light guide is removably housed in a slot on the outer periphery of a spacer to expose the light guide to be branched; removing the jacket of the optical cable and cutting the optical fiber to be branched at a position separated by the extra length of the optical fiber connecting work; 1. A method for wiring a light guide in an optical cable, comprising the steps of: pulling out the light guide into the slot; and inserting another light guide into the empty slot formed by pulling out the light guide.