JP2779168B2 - Core fiber jump-out prevention ring for optical fiber cable accommodation spacer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber core-holding ring for an optical fiber core-housing spacer which prevents an optical fiber core housed in a slot of a spacer from jumping out of the slot. Things.

[Prior Art] When a rear branch connection is made to an optical fiber cable, a sheath is stripped over a required length at a position where the rear branch connection is to be made, an inner spacer is exposed, and a plurality of slots of the spacer are exposed. The optical fiber core in the required slot is taken out of the slot, cut, and connected to the branch optical fiber core. At this time, if the slot of the spacer is formed in the SZ type, there is a possibility that another optical fiber core remaining in the slot may jump out of the slot due to its elasticity in the exposed section of the spacer. To prevent this, a ring 18 with a slit 17 is attached to the outer periphery of the spacer 2 as shown in FIG.
It is considered to prevent the optical fiber 7 from jumping out of the slot 6 at 18.

[Problem to be Solved by the Invention] However, in the ring 18 with the slit 17, the slit
If slot 17 does not face slot 6, slot 6
Although the optical fiber 7 can be prevented from jumping out of the slot, there is a problem that the optical fiber 7 jumps out through the slit 17 where the slit 17 faces the slot 6 as shown in the figure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical fiber core receiving spacer for an optical fiber core housing spacer that can prevent the optical fiber core from jumping out at any part in the circumferential direction.

[Means for Solving the Problems] To achieve the above-mentioned object, a core jump-out preventing ring for an optical fiber core-containing spacer according to the present invention is a helical type having a length exceeding one turn and attached to the outer periphery of the spacer. The helical ring main body is formed mainly of a ring main body, and a gap for passing the optical fiber core wire is provided between adjacent turn portions that overlap each other beyond one turn.

[Operation] Since the helical ring main body has a helical shape with a length exceeding one turn, it is possible to prevent the optical fiber core wire from jumping out of the slot at any position in the circumferential direction of the spacer. Also, in this pop-out prevention ring, an optical fiber core to be taken out is placed on the tip of the ring main body, and the optical fiber core is rotated in the circumferential direction through the optical fiber core in a gap between adjacent turn portions, so that only a required optical fiber core is provided. The remaining optical fiber cores are projected out of the spacer, and can be prevented from jumping out by the ring body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 5 show a first embodiment of the present invention. The optical fiber core receiving spacer 1 for an optical fiber core accommodating spacer according to the present embodiment is a helical ring main body made of an elastic material such as plastic or metal having a turn length exceeding one turn and attached to the outer periphery of the spacer 2. 3 as a main component. The helical ring main body 3 is provided with a gap 3B for passing the optical fiber core wire 7 between adjacent turn portions that overlap and extend beyond one turn. The distal end 3A of the helical ring main body 3 is chamfered at both ends in the width direction so as to be round as shown in FIG. 4, and the distal end 3A is tapered so as to be thin. ing.

In the rear branch connection portion of the optical fiber cable 4, the sheath 5
Is stripped off over the required length, exposing the spacer 2. A core wire protruding prevention ring 1 is attached to the exposed outer periphery of the spacer 2 at a predetermined interval.
Of the optical fiber core wire 7 from the SZ type slot 6 is prevented. In order to take out the optical fiber 7 to be rear-branched from the spacer 2, the distal end 3A of the helical ring main body 3 is inserted into the slot 6 as shown in FIG. Optical fiber core wire 7 to be taken out
And put the optical fiber core 7 in the gap 3B between adjacent turn parts.
And rotating the helical ring main body 3 in the circumferential direction of the spacer 2 with the tip 3A at the head as shown by the arrow. In this manner, only the optical fiber core 7 to be taken out comes out of the outer periphery of the helical ring main body 3 and becomes free, and the remaining optical fiber core 7 is removed.
Is held down by the helical ring main body 3 to prevent the protrusion. The removed optical fiber core wire 7 is cut,
A branch optical fiber core wire 9 of the branch optical fiber cable 8 is connected to a cut end of the optical fiber cable 8 at a core connecting portion 10. Such a core connecting portion 10 and the extra length 11 of both optical fiber cores 7, 9
Are stored in the extra-length storage case 12. The extra length storage case 12 that accommodates the core wire connection portion 10 and the extra length portion 11 in this manner
The exposed portion of the spacer 2 is accommodated in the connection box 13. The penetrating portions of the optical fiber cable 4 and the branch optical fiber cable 8 at both ends of the connection box 13 are hermetically sealed by a split end plate 14 and a sealing material 15. The sheath ends of the optical fiber cable 4 and the branch optical fiber cable 8 in the connection box 13 are fixed to the connection box 13 by fixing brackets 16.

FIG. 6 shows a second embodiment of the core wire protrusion prevention ring 1 of the present invention. The helical ring main body 3 of the core wire protrusion prevention ring 1 of the present embodiment is different from the first embodiment in that it is formed of an elastic linear body. Such a core wire protrusion prevention ring 1 can also obtain the same effect as that of the first embodiment.

[Effects of the Invention] As described above, the optical fiber jumping prevention ring for an optical fiber optical fiber receiving spacer according to the present invention is mainly composed of a helical ring main body having a length exceeding one turn and being attached to the outer periphery of the spacer. The structure has an effect of preventing the optical fiber from jumping out of the slot at any position in the circumferential direction of the spacer. Also, in this pop-out prevention ring, an optical fiber core to be taken out is placed on the tip of the ring main body, and the optical fiber core is rotated in the circumferential direction through the optical fiber core in a gap between adjacent turn portions, so that only a required optical fiber core is provided. There is an advantage that the remaining optical fiber can be prevented from protruding out of the spacer by the ring body. Further, the protrusion prevention ring has an advantage that the structure is simple and can be provided at low cost.

[Brief description of the drawings]

FIGS. 1 and 2 are side views showing a state in which a rear branch optical fiber cable is attached to a spacer and a perspective view showing a process of taking out a core from the spacer in the first embodiment of the core jump-out preventing ring according to the present invention. FIG. 3 is a cross-sectional view of a portion where the core wire protrusion preventing ring is attached in FIG. 1, FIG. 4 is a front view of the distal end portion of the core wire protrusion prevention ring of this embodiment, and FIG. FIG. 6 is a longitudinal sectional view showing an example of the sixth embodiment.
FIG. 7 is a perspective view of the use state of the core wire protrusion prevention ring according to the second embodiment of the present invention, and FIG. 7 is a perspective view of the use state of the conventional core wire protrusion prevention ring. DESCRIPTION OF SYMBOLS 1 ... Prevention wire core prevention ring, 2 ... Spacer, 3 ... Helical type ring main body, 3A ... Tip part, 3B ... Clearance, 4 ... Optical fiber cable, 5 ... Sheath, 6 ... Slot, 7 ... Optical fiber core wire.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Morinobu Mizutani 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Tokyo Electric Power Company (72) Inventor Tadashi Ujino 6 Yawata Kaigandori, Ichihara City, Chiba Prefecture Furukawa Electric Inside Chiba Works Co., Ltd. Inside Chiba Works (72) Inventor Etsuo Tanabe 6 Yawata Kaigandori, Ichihara-shi, Chiba Prefecture Inside Furukawa Electric Co., Ltd. Chiba Works (56) References Real Open 1984-87007 (JP, U) (58) Fields investigated ( Int.Cl. ⁶ , DB name) G06B 6/44 361

Claims (1)

(57) [Claims] An optical fiber core housing spacer for preventing an optical fiber core housed in a slot of a spacer from jumping out of the slot, wherein the core is mounted on an outer periphery of the spacer. A helical ring main body having a turn length exceeding the length of the turn, wherein the helical ring main body has the optical fiber core between adjacent turn portions overlapping and overlapping at a portion exceeding one turn. An optical fiber core-outgoing prevention ring for an optical fiber core-containing spacer, wherein a gap through which the wire passes is provided.