JP3698519B2 - Optical cable branching / passing cabinet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cabinet that houses a branch connection part of some optical fiber cores and a non-connection through part of other optical fiber cores in the middle of an optical cable.
[0002]
[Prior art]
Conventionally, when an optical cable is wired to each floor of a building, a wiring system as shown in FIG. 2 is employed. That is, the optical cable 1 rising in the building is continuous, and the cabinet 7 is installed on each floor. At each floor, the sheath 5 in the middle of the optical cable 1 is peeled by a predetermined length to expose the optical fiber core wire 3. The ends of the sheath 5 on both sides of the exposed portion of the core are introduced into the cabinet 7 from below. In the cabinet 7, some of the exposed optical fiber cores 3 are connected to the optical fiber cores 11 of the branch cable 9 on the floor (13 is the connecting portion), and others. The optical fiber core wire 3B is connected without being connected and is led along the inside of the peripheral wall of the cabinet 7 to rise to the next floor.
If it does in this way, since there are few connection locations of an optical fiber core wire, connection loss can be reduced.
[0003]
[Problems to be solved by the invention]
In the conventional cabinet, since the optical fiber core wire passed through without connection is wired along the inside of the peripheral wall of the cabinet, it is necessary to accurately adjust the stripping length of the sheath to a specified length. If the sheath stripping length is too short, the optical fiber core wire to be passed cannot fit in the wiring route in the cabinet, and if it is too long, the optical fiber core wire may sag and increase in transmission loss due to bending may occur. As described above, in the conventional cabinet, it is necessary to accurately adjust the peel-off length of the sheath to a specified length, so that the work is troublesome.
[0004]
An object of the present invention is to provide an optical cable branching / passing cabinet that solves the above problems.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the present invention strips an intermediate sheath of an optical cable wired in a building to expose an optical fiber core, and a part of the optical fiber core is connected to an optical fiber core of a branch cable. In an optical cable branching / passing cabinet that houses the connected part and the part through which the other optical fiber core wires are passed without connection ,
The extra length of the optical fiber core wire (3A) on the optical cable (1) side and the optical fiber core wire (11) on the branch cable (9) side connected by the connecting portion (13) is accommodated in the cabinet (7). Provide extra length storage case (21),
Further, a guide (23) is provided in the cabinet (7) for routing the optical fiber core wire (3A) passed through without connection along the inside of the peripheral wall of the cabinet (7), and along the inside of the peripheral wall. Provided with a surplus length storage member (25) for storing the surplus length of the unconnected optical fiber (3B) wired in the
It is characterized by this.
[0006]
If such an extra length storage member is provided, the sheath of the optical cable can be peeled off to a slightly longer length and the extra length of the optical fiber core can be accommodated there. This eliminates the need for precise adjustment and facilitates the work.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. This cabinet 7 peels off the intermediate sheath 5 of the optical cable 1 to expose the optical fiber core wire 3, and introduces the ends of the sheath 5 on both sides of the core wire exposed portion from below. In the cabinet 7, among the exposed many optical fiber cores 3, some of the optical fiber cores 3A are connected to the optical fiber cores 11 of the branch cable 9 on the floor (13 is the connection part), The other optical fiber core wires 3B pass through without connection.
[0008]
In FIG. 1 , 4 is a tension member of the optical cable 1, 15 is a fixture of the tension member 4 installed in the cabinet 7, 17 is a fixture of the end of the sheath 5 of the optical cable 1 introduced into the cabinet 7, Reference numeral 19 denotes a fixing tool for the sheath end portion of the branch cable 9 introduced into the cabinet 7, and 21 denotes an optical fiber core wire 3 A on the optical cable 1 side and an optical fiber core wire 11 on the branch cable 9 side connected by the connection portion 13. The extra-length storage case 23 is a guide for routing the optical fiber core wire 3 </ b> B that passes through the cabinet 7 without connection along the inside of the peripheral wall of the cabinet 7 .
[0009]
The cabinet 7 is further provided with a surplus length storage member 25 separately from the surplus length storage case 21, in which the surplus length of the unconnected optical fiber core 3B wired along the inside of the peripheral wall of the cabinet 7 is stored. It is what you do. Since the extra length storage member 25 does not need to store the core wire connection portion, it may be a thin member formed by folding a plastic sheet.
[0010]
In the case of this cabinet 7, it is necessary to extend the length of the sheath 5 of the optical cable 1 longer than the conventional one to allow the optical fiber core wire 3 </ b> B to have an extra length, but the length of the sheath 5 of the optical cable 1 is slightly increased. Even if an error occurs, the error can be absorbed in the extra length storage member 25. Therefore, it is not necessary to make the stripping length of the sheath 5 exactly match the specified length, and the sheath stripping operation becomes very easy. In addition, it can flexibly cope with a certain amount of sheath peeling error. Therefore, work efficiency is improved.
[0011]
【The invention's effect】
As described above, according to the present invention, since the extra length storage member for the lead-through optical fiber core wire is provided, it is not necessary to accurately adjust the peel-off length of the sheath to the specified length. This has the effect of improving the work efficiency.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a cabinet according to the present invention in a state where a lid is omitted.
FIG. 2 is an explanatory diagram showing an optical cable wiring system in a building.
[Explanation of symbols]
1: Optical cable 3: Optical fiber core wire 3A: Branched optical fiber core wire 3B: Passed optical fiber core wire 5: Sheath 7: Cabinet 9: Branch cable 11: Optical fiber core wire 13: Optical fiber core wire Connection part 21: Extra length storage case 25: Extra length storage member

Claims (1)

The intermediate sheath (5) of the optical cable (1) wired in the building is peeled to expose the optical fiber core (3), and a part of the optical fiber core (3A) is connected to the branch cable (9). In an optical cable branching / passing cabinet that houses a portion connected to the optical fiber core wire (11) and a portion through which the other optical fiber core wire (3B) is passed without connection ,
The extra length of the optical fiber core wire (3A) on the optical cable (1) side and the optical fiber core wire (11) on the branch cable (9) side connected by the connecting portion (13) is accommodated in the cabinet (7). Provide extra length storage case (21),
Further, a guide (23) is provided in the cabinet (7) for routing the optical fiber core wire (3A) passed through without connection along the inside of the peripheral wall of the cabinet (7), and along the inside of the peripheral wall. Provided with a surplus length storage member (25) for storing the surplus length of the unconnected optical fiber (3B) wired in the
A cabinet for branching / passing optical cables wired in buildings .

Images