JP2801206B2 - Optical fiber cable connection - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connection portion of an optical fiber cable of a type in which an optical fiber core is protected in a slot of a spacer.

[Prior Art] In a connection portion of this type of optical fiber cable, a bundle of a plurality of optical fiber cores to be connected is taken out from a slot of a spacer and connected to each optical fiber core of a connection partner. I have.

If the bundle of a plurality of optical fiber cores is taken out from the slot of the spacer as described above, the protection by the spacer is lost, and there is a problem that the fiber is easily damaged during the connection work or the like.

In such a case, one optical fiber core has conventionally been covered with one protective tube for protection.

[Problem to be Solved by the Invention] However, in such a structure in which one optical fiber core is covered with one protective tube to protect it, one optical fiber core is protected.
In a connection portion of an optical fiber cable in which a set bundle of a plurality of optical fiber cores is accommodated in one slot, there is a problem that it takes much trouble to protect each optical fiber core.

An object of the present invention is to provide a connection portion of an optical fiber cable that can easily protect a bundle of a plurality of optical fiber core wires taken out from a slot of a spacer.

Means for Solving the Problems In order to achieve the above object, according to the present invention, a slit provided with a slit over the entire length is provided on the outer periphery of a bundle of a plurality of optical fiber core wires coming out of a slot of a spacer. It is characterized in that the protective tubes are mounted collectively.

[Operation] As described above, when the bundle of a plurality of optical fiber cores coming out of the slot is collectively protected by the common protective tube, the bundle of the optical fiber cores can be efficiently protected at low cost. be able to.

In particular, since the protective tube is provided with a slit over its entire length, even if a bundle of a plurality of optical fiber cores is opened, the side of the bundle of optical fiber cores is opened by opening the slit of the protective tube. Can be easily mounted. For this reason, when the protective tube is fitted from the end, the kink is generated in the optical fiber core wire in contact with the inner surface of the protective tube due to friction at the time of insertion of the protective tube. According to this, it can be avoided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a first embodiment in which the present invention is applied to a connection portion of an optical fiber cable of a type in which optical fibers are connected at the ends of both optical fiber cables to be connected. It is shown.

As shown in the drawing, at the optical fiber cable connection portion of the present embodiment, the sheath 2 and the presser winding layer 3 of the optical fiber cable 1 to be connected are stripped off at its ends, and the spacer 4 is exposed. From each slot 5 of the spacer 4, a bundle of a plurality of optical fiber cores 6 is respectively taken out. The tension member 7 is taken out from the end of the spacer 4. A protective tube 8 made of a silicon tube or the like is collectively mounted on a slot-by-slot basis on the outer periphery of the bundle of a plurality of optical fiber core wires 6 taken out from each slot 5. These protective tubes 8 have a slit structure in which a slit is formed in the longitudinal direction over the entire length. In addition, these protective tubes 8 with slits have a structure that can be identified by being color-coded or numbered by an oil-based stamp or a number ring. Protection tube 8 with slit
Each of the optical fiber cores 6 protected by the above is a distal end portion derived from the distal end of the protective tube 8 with a slit. Are connected respectively to the non-protected portions.

The connection portion of these optical fiber cores and the extra length of the optical fiber core are stored in an extra length storage case 9. A connection box 10 is mounted on both ends of the sheath 2 of the optical fiber cable 1 to be connected, and an end plate 11 is mounted on an end of the connection box 10 and sealed with a sealant 12.
Fastening fittings 13 are respectively attached to ends of both sheaths 2 in the connection box 10 by bolting, and both optical fiber cables 1 are connected to each other by a connecting member 14 for connecting the fastening fittings 13. I have. Further, the tension member 7 is retained by the tension member retaining bracket 15.

According to such a structure, the bundle of the optical fiber cores 6 is put into the protective tube 8 with a slit and is grouped in the unit of the slot 5, so that the core number can be easily managed during the connection work. There is. In addition, the weak optical fibers 6 can be collectively and efficiently protected outside the slot 5.

FIG. 3 and FIG. 4 show a second embodiment in which the present invention is applied to a rear branch connecting portion. At the rear branch connection portion, the sheath 2 is stripped off at a required length at a position where the rear branch connection portion is to be formed, and the spacer 4 is exposed. Each optical fiber core 6 to be connected from the slot 5 at the exposed portion of the spacer 4
Are taken out in slot units and cut. The bundle of cut optical fiber cores 6 is provided with the above-described slitted protective tube 8 in slot units. At the tip of each optical fiber core wire 6 led out from the tip of the protective tube 8 with a slit, a branch optical fiber core (not shown) led out from the tip of the branch optical fiber cable 16 and protected by the protective tube 8 with a slit is attached. The unprotected portion at the tip is connected by a core wire connection portion 17.
The cord connecting portion 17 and the extra length 18 of both cords branched and connected as described above are stored in the extra length storage case 9. At the exposed portion of the spacer 4, a core jump-out prevention ring 19 is mounted to prevent the bundle of the optical fiber core wires 6 remaining in the slot 5 from jumping out, and a reinforcing pipe 20 is further placed on the spacer 4. Is attached, and the bending of the spacer 4 is prevented. Such a rear branch connection portion is similarly connected to a connection box.
Stored in 10 and protected. The end 13 of the sheath 2 is fixed to the connection box 10 by a fixing bracket 13.

With such a structure, the same effect as in the first embodiment can be obtained. Further, at the subsequent branch connection portion, when the bundle of optical fiber core wires 6 not taken out from the slot 5 at first is taken out in the future, the bundle can be easily inserted into the protection tube 8 through the slit of the protection tube 8 with a slit.

[Effects of the Invention] As described above, in the connection portion of the optical fiber cable according to the present invention, the bundle of a plurality of optical fiber core wires coming out of the slot is collectively protected by the common protective tube. Therefore, the bundle of optical fiber cores can be efficiently protected at low cost.

In particular, since the protective tube is provided with a slit over its entire length, even if a bundle of a plurality of optical fiber cores is opened, the side of the bundle of optical fiber cores is opened by opening the slit of the protective tube. Can be easily mounted. For this reason, when the protective tube is fitted from the end, the kink is generated in the optical fiber core wire in contact with the inner surface of the protective tube due to friction at the time of insertion of the protective tube. According to this, it can be avoided.

Further, at the connection portion of the optical fiber cable, the bundle of the optical fiber cores coming out of the spacer is managed in the unit of the protection tube, so that even if a large number of cores are taken out, the management of the core number and the like is easy. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view of a state before connection at an end of an optical fiber cable according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a main part of a connection portion in the first embodiment, and FIG. FIG. 4 is a perspective view of a state before connection at a rear branch connection point of an optical fiber cable according to a second embodiment of the present invention, and FIG. 4 is a longitudinal sectional view of a connection portion in the second embodiment. 1 ... optical fiber cable, 2 ... sheath, 4 ... spacer, 5 ... slot, 6 ... optical fiber core wire, 8 ...
Protective tube with slit, 10 connection box, 16 branch optical fiber cable, 17 core wire connection.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Morinobu Mizutani 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Tadashi Ujino 6 Yawata Kaigandori, Ichihara City, Chiba Prefecture Furukawa Electric Chiba Works Co., Ltd. (72) Inventor Keiichi Ito 6 Yawata Kaigandori, Ichihara City, Chiba Prefecture Furukawa Electric Co., Ltd. (72) Inventor Etsuo Tanabe 6 Yawata Kaigandori, Ichihara City, Chiba Prefecture Furukawa Electric Co. Chiba Works (72) Inventor Shigeru Tategami 6 Yawata Kaigandori, Ichihara City, Chiba Prefecture Furukawa Electric Co., Ltd. Chiba Works (56) References JP-A-60-216308 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) G02B 6/00 336 G02B 6/24 G02B 6/44 366

Claims (1)

(57) [Claims] 1. An optical fiber cable comprising a bundle of a plurality of optical fiber cores housed in a slot of a spacer, and an outer periphery of the spacer covered with a sheath. In a connection portion of an optical fiber cable in which a bundle of core wires is output from the slot and connected to each optical fiber core of a connection partner, the outer periphery of the bundle of the optical fiber core wires output from the slot A connection section for an optical fiber cable, wherein a protective tube with a slit provided with a slit over its entire length is mounted collectively.