JP3487972B2 - Waterproof case for optical fiber branch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof case for branching an optical fiber provided in a branch portion where a branching optical fiber is branched and led out in the middle of an optical fiber cable in an optical transmission line using an optical fiber.

[0002]

2. Description of the Related Art In an optical transmission line using an optical fiber, a connection box for taking out a desired optical fiber from the optical fiber cable and pulling it to the outside is provided at an appropriate position of the optical fiber cable.

[0003]

By the way, with the increase in the number of cores of optical fiber cables and the increase in branch points, there has been a demand for a branch case that is easy to branch and connect and is easy to handle.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a waterproof case for branching an optical fiber in which the cost for laying an optical transmission line is reduced and the construction period is shortened. is there.

[0005]

The present invention has the following features to attain the object mentioned above. That is, in the optical transmission line using the optical fiber cable , the invention described in claim 1 is an optical fiber provided in a branching portion from which the branching optical fiber is branched out from the middle of the optical fiber cable in which the branching optical fibers are assembled. A waterproof case for branching, comprising a case body made of a water-blocking material, which is mounted so as to cover the branch part, and the optical fiber of the case body is provided.
Outlet of the branch optical fiber portion to be the lower side when mounted on the bus cable is 1 or more openings, the case body is formed in a split shape, the case body light Faibake
The gripping claws that bite into the optical fiber cable when the case body is assembled are arranged in two opposite positions on the inner surfaces facing each other at both ends in the cable arrangement direction.
When the case body is integrated, the grip claws
From both sides of the fiber optic cable
Japanese that is adapted to grip bite into the sheath
The characteristic waterproof case for branching the optical fiber is used as a means for solving the above problems.

[0006] In the claims 2 waterproof case for optical fiber branch, wherein in claim 1 Symbol mounting of the waterproof case for optical fiber branch, said branch optical fiber for supporting the tensile force acting on the optical fiber for the branch A supporting wire (19) is integrally provided, and the optical fiber cable is attached to the case body.
Support wire fixing portion for fixing the ends of the said support lines which are derived the branch optical fiber Toto Le (20) is the derived
It is provided adjacent to the mouth as a means for solving the above problems.

[0007]

[0008]

According to the waterproof case for branching optical fibers of the first aspect, the branching portion between the branching optical fiber and the optical fiber cable in which the branching optical fibers are assembled is protected. There is no need to store an optical connection part such as a connector inside, the configuration can be simplified, the mounting workability is good, and the branching optical fiber can be branched from any position of the optical fiber cable. Can be done. Further, since the sheath of the optical fiber cable is removed from the branch portion, the case body is made of a water-blocking material to prevent rainwater and the like from entering the removed portion of the sheath.

Further, according to the waterproof case for optical fiber branching this, since the case body is split shape, it can easily be attached to any position of the optical fiber cable.
When the case bodies are combined, the grip claws bite into both sides of the optical fiber cable, and the case body is stably attached to the optical fiber cable.

According to the optical fiber branching waterproof case of the second aspect, the tensile force acting on the support wire provided on the branching optical fiber is supported by the support wire fixing portion. This tension support does not affect the fiber optic cable,
Moreover, when a plurality of branching optical fibers are led out from the same branching portion, the tension state can be adjusted for each branching optical fiber.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a waterproof case for branching an optical fiber according to the present invention will be described below with reference to FIGS. As shown in FIG. 2, the waterproof case for branching an optical fiber according to this embodiment is applied to a wiring route of an optical fiber,
Optical fiber cable 1 in which branch optical fibers 11 are assembled
The branching optical fiber 11 is provided in the branching section 13 where the branching optical fiber 11 is branched out from the middle of 2. Here, the branching optical fiber is wired from the optical fiber cable to the user 1
It is an optical fiber cord provided with a weatherproof protective sheath of two cores.

Hereinafter, the optical fiber branch waterproof case 1 will be described.
Details of the structure of 0 will be described with reference to FIG. The optical fiber branching waterproof case 10 has a case body 14 that is installed so as to cover the branch portion 13. The case body 14 is made of a water-blocking material such as plastic, and is formed in a substantially elongated tubular shape that can be mounted on the outside of the optical fiber cable 12 when assembled. A dropout portion 15 for pulling down the branching optical fiber 11 led out from the optical fiber cable 12 inside the case body 14 is attached to the lower side of the case body 14 when attached to the optical fiber cable 12. Is projected on.

A lead-out port 16 for leading the branching optical fiber 11 out of the optical fiber branching waterproof case 10 is opened at the bottom of the drop portion 15. The outlet 16 is formed in an elongated rectangular shape along the penetrating direction of the optical fiber cable 12 in the optical fiber branching waterproof case 10. An alignment plate 17 for preventing the plurality of branching optical fibers 11 branched from the optical fiber cable 12 in the branching portion 13 from being entangled with each other is attached to the outlet 16 so as to be fitted therein.
The alignment plate 17 is a long and narrow rectangular rubber plate material that coincides with the outlet 16, and has a plurality of branch optical fiber insertion holes 18 through which the branch optical fibers 11 are inserted, along the length direction thereof. Has been done. A slit 17a communicating with the branch optical fiber insertion hole 18 is formed on the side surface of the long side of one side of the alignment plate 17. In addition, the alignment plate 17
Is detachable from the outlet 16 when the case body 14 is separated.

An end of a tension-holding support wire 19 provided integrally with the branch optical fiber 11 is fixed on the bottom of the drop portion 15 on the same straight line as the lengthwise direction of the outlet 16. A supporting wire fixing portion 20 is provided adjacent to the outlet 16. The support wire fixing portion 20 is roughly configured by a rectangular plate-like support wire fixing plate 21 similar to the alignment plate 17, and a fixing plate mounting opening 22 to which the support wire fixing plate 21 is mounted. The support wire 19 is provided on a surface of the support wire fixing plate 21 that is an outer side when the support wire 19 is attached to the case body 14.
Fixing metal fittings 23 for fixing are fixed by screws. The support wire fixing plate 21 is detachable from the fixing plate mounting opening 22 when the case body 14 is separated. In addition, in order to enhance waterproofness, the support wire fixing plate 2
1 and the alignment plate 17 are in close contact with the optical fiber branching waterproof case 10.

The optical fiber cable 1 of the case body 14
An engaging protrusion 24 and an engaging claw 25 that maintain the integrated state of the case bodies 14 by engaging with each other are provided in the upper side portion of the case 2 when mounted. When the case main body 14 is integrated, the case main body 14 is inserted into the sheath 26 of the optical fiber cable 12 from both sides in the diametrical direction when the case main body 14 is integrated. A metal plate 28, on which a large number of gripping claws 27 for gripping are provided, is arranged to face each other. In addition, the optical fiber branching waterproof case 1 is provided outside the grip claws 27 at both ends of the case body 14 in the arrangement direction of the optical fiber cable 12.
0 Rubber seal plate that prevents rainwater from entering the interior 2
9 are arranged to face inner surfaces of the case body 14 which face each other. This seal plate 29 has an inner peripheral surface shape along the outer peripheral surface of the optical fiber cable 12, and when the case main body 14 is integrated and attached to the optical fiber cable 12, the seal plate 29 is formed on the entire outer surface of the optical fiber cable 12. The peripheral surface is pressed. Further, the seal plate 29 is the case body 1
4 can be removed from inside, and can be replaced according to the outer shape of the optical fiber cable 12. These, metal plate 2
A plurality of cases 8 and seal plates 29 are arranged at the both ends of the case body 14 at predetermined intervals in the axial direction of the optical fiber cable 12.
The protruding wall 30 of 4 prevents the optical fiber cable 12 from being displaced in the axial direction.

The branching optical fiber 11 is integrated with the supporting wire 19 as a whole (not shown), and the supporting wire 19 is separated only at the base end thereof. The support wire 19 is provided in the optical fiber cable 12 so that the branch optical fiber 11 is
It is a steel wire that is arranged integrally with.

The optical fiber cable 12 is a self-supporting type cable in which a suspension wire 31 is arranged in parallel with a strand type or loose tube type cable. The sheath 26 of the optical fiber cable 12 is removed at the branch portion 13, and the tube 32 having the branch optical fiber 11 therein is exposed. In the branching portion 13, an opening 33 is formed in the target tube 32, and the branching optical fiber 11 arranged inside the tube 32 is pulled out from the opening 33. When a plurality of branching optical fibers 11 are led out from the optical fiber cable 12 in the same branching section 13, these branching optical fibers 11 are separated from each other in the pulling-down section 15, and the alignment plates 17 respectively. It is adapted to be inserted and supported in another branch optical fiber insertion hole 18.

The optical fiber branch waterproof case 10 of the present invention
Can be freely attached to any position of the optical fiber cable 12, and by providing the branch portion 13 to the optical fiber cable 12 at the mounting position of the case body 14,
The branching optical fiber 11 is branched from the optical fiber cable 12 at an appropriate position and wired at an important point. Therefore, for example, as shown in FIG. 2, compared to the conventional line in which the branch optical fiber 11 is branched from the closure 5 directly to each house 3, the number of installed closures 5 can be reduced and the overhead cable can be installed. The length of laying 2 can be shortened, and the laying cost of the optical fiber network can be significantly reduced. Further, the waterproof case 10 for branching the optical fiber has a simple structure and can be easily attached to the optical fiber cable 12 only by integrating the case body 14 in a split state, so that the branching optical fiber 11 can be installed. Work efficiency can be improved and the spread of optical fiber networks can be promoted.

In addition, the case main body 14 has a water-blocking property as a whole and prevents rainwater or the like from entering from the branch portion 13. Therefore, deterioration of the optical fiber cable 12 and the branch optical fiber 11 and transmission of optical signals are performed. It is possible to prevent the occurrence of troubles, reduce the number of maintenances, and stably use for a long period of time. Further, when the branch portion 13 is formed at an appropriate position of the optical fiber cable 12, the sheath 26 of the optical fiber cable 12 is removed, and the tube 32 accommodating the target branch optical fiber 11 is pulled out to open the opening 33.
To form the optical fiber 11 for branching from inside the tube 32.
Is pulled out together with the supporting wire 19, but the supporting wire 19 is cut outside the tube 32 and fixed to the fixing metal fitting 23, so that the supporting wire 19 can be used as it is as a tension member of the branching optical fiber 11. Moreover,
It is possible to prevent the tensile force acting on the branching optical fiber 11 from affecting the other branching optical fibers 11, improve the work efficiency of laying the branching optical fibers 11, and prevent disconnection. it can.

The waterproof case 10 for branching the optical fiber according to the present invention has been described by taking the case where it is applied to the subscriber line in the above embodiment, but it can be widely used in other lines. A plurality of outlets 16 in the case body 14 may be formed, and the case body 1
4 may be opened on the side surface or the like. In this case, it is necessary to provide the outlet 16 with a water stopping means for preventing intrusion of rainwater or the like. The case body 14 may have a shape that is curved along the curve of the cable to be mounted, corresponding to the bending of the cable to be mounted.

[0021]

As described above, according to the optical fiber branching waterproof case of the first aspect, the branching optical fiber is branched out from the middle of the optical fiber cable in which the branching optical fibers are assembled. And a case main body made of a water-impervious material, which is installed so as to cover the branch portion, and at least one branch optical fiber outlet is opened in the case main body. By attaching the optical fiber to the cable, the branching optical fiber can be freely branched at an appropriate position of the optical fiber cable, and the installation cost of the optical transmission line using the optical fiber can be significantly reduced. In addition, it prevents rainwater from entering from the branching part, thus preventing deterioration of the optical fiber cable and branching optical fiber and occurrence of optical signal transmission failure, reducing the number of maintenance times and using it stably for a long period of time. be able to.

Further, in the waterproof case for optical fiber branch of this, the case body is formed in a split shape, at a position gripping claws biting into the optical fiber cable when the combination of the case body faces the split in the casing body Since it is arranged, the structure is simple, and it can be easily attached to the optical fiber cable simply by integrating the case body in a split state, so the work efficiency of laying the optical transmission line using the optical fiber is improved. Therefore, the construction period can be shortened.

In the optical fiber branching waterproof case according to claim 2, a support wire for supporting a pulling force acting on the branching optical fiber is integrally provided on the branching optical fiber, and the case body is provided with the supporting wire. A support wire fixing part that fixes the end of the support wire is provided, and the tensile force that acts on the branch optical fiber is individually supported by the support wire for each branch optical fiber. It is possible to prevent the pulling force acting on the optical fiber from affecting the other branching optical fibers, improving the work efficiency of laying the branching optical fiber and preventing disconnection.

[Brief description of drawings]

FIG. 1 is a sectional perspective view showing an embodiment of a waterproof case for branching an optical fiber according to the present invention.

FIG. 2 is a system configuration diagram showing an example in which the waterproof case for branching the optical fiber of FIG. 1 is applied to a wiring route using an optical fiber.

[Explanation of symbols]

Reference numeral 10 ... Waterproof case for branching optical fiber, 11 ... Optical fiber for branching, 12 ... Optical fiber cable, 13 ... Branching portion, 1
4 ... Case body, 16 ... Outlet port, 19 ... Support line, 20 ...
Support wire fixing part, 27 ... Gripping claw

Continuation of front page (56) Reference JP-A-63-200104 (JP, A) JP-A-63-194203 (JP, A) JP-A-6-214119 (JP, A) JP-A-5-113509 (JP , A) Japanese Unexamined Patent Publication No. 4-269703 (JP, A) Actually open 6-33103 (JP, U) Actually open 2-139428 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) G02B 6/00 G02B 6/24

Claims (2)

(57) [Claims] 1. In an optical transmission line using an optical fiber cable , a branching optical fiber is branched from a midpoint of an optical fiber cable (12) in which branching optical fibers (11) are gathered to a branching section (13). A waterproof case (10) for branching an optical fiber, comprising a case body (14) made of a water-impervious material that is mounted so as to cover the branch portion, and the optical fiber cable of the case body. Dress
Upon wearing outlet of the branch optical fiber portion to be the lower side (16) are one or more openings in said case body is formed in a split shape, the case body
Opposed at both ends of the optical fiber cable placement direction
On the inner surface, grip claws (27) that bite into the optical fiber cable when the case body is assembled are arranged at two opposing positions, and when the case body is integrated.
From the both sides of the optical fiber cable in the diameter direction
Grasping by cutting into the sheath (26) of the optical fiber cable
A waterproof case for branching an optical fiber. 2. The method of claim 1 Symbol mounting of the waterproof case for optical fiber branch, support wire that supports the tensile force acting on the optical fiber for the branch (19) is provided integrally on the branch optical fiber , The optical fiber cable to the case body.
Support wire fixing portion for fixing the ends of the said support lines which are derived the branch optical fiber Toto from Buru (20) is the
A waterproof case for branching an optical fiber, which is provided adjacent to the outlet .