JPH0634825A - Optical fiber connection box - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an optical fiber connection box in which work such as connection change is easy, the pull-in optical fiber core wire can be safely stored, and the extra length storage case can be locked at low cost. [Structure] A plug-in type optical fiber connecting portion between the pull-in optical fiber core wire 5 inside the extra length storage case 6 and the pull-out optical fiber core wire outside the extra length storage case 6 is connected to the extra length storage case 6 by Provided through the front. An auxiliary door 15 is provided on the front surface of the box 2 on the side where the pull-in optical fiber core 5 rises, which protects the rising portion of the pull-in optical fiber core 5 and prevents the extra length storage case 6 from slipping out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber splicing box in which an extra length storage case is installed inside the box.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional optical fiber connection box of this type has a box body 2 of a hexahedron whose one surface is opened as an opening 1. A cutout groove 3 is provided on the bottom surface 2 a of the box body 2, and a pull-in optical fiber cable 4 is drawn into the box body 2 from the cutout groove 3. From the end of the retracted optical fiber cable 4, a plurality of optical fiber core wires 5 are led out. The pull-in optical fiber core wire 5 is introduced into an extra length storage case 6 installed in the box body 2, and the extra length portion is stored. In the extra length storage case 6, the pull-in optical fiber core wire 5 is connected to the pull-down optical fiber core wire (not shown) of the drop-out optical fiber cable by a core wire connecting portion. The opening 1 of the box body 2 is closed by an opening / closing door 7.

In such an optical fiber connection box, the drop-in optical fiber cable 4 and the drop-out optical fiber core wire 5 are under the control of a communication service provider such as NTT, and the drop-out optical fiber cable (not shown) The servicing optical fiber core is under the control of the user.

[0004]

In such an optical fiber splicing box, an extra-length storage case 6 is provided with a splicing portion for connecting the pulling-in optical fiber core 5 and the pulling-out optical fiber core. However, there is a problem that it is difficult to perform work such as connection change.

Although the pulling-in optical fiber cable 4 and the pulling-in optical fiber core wire 5 are not messed up when the installation is completed, the pulling-out optical fiber core wire (not shown) is relatively frequent because of connection change or the like. I often mess with it. At the time of changing the connection of the pull-down optical fiber core wire or the like, there is a risk that the pull-in optical fiber core wire 5 may be erroneously pushed, pulled, or hit by working equipment or the like to be damaged.

Further, the conventional drawer type extra length storage case 6 is provided with a box 2 to prevent the extra length storage case 6 from being pulled out by a dedicated locking tool.
Since each of them was locked, there was a problem that the cost was increased by the amount of each lock.

An object of the present invention is to provide an optical fiber connection box in which work such as connection change is easy, the retractable optical fiber core wire can be safely stored, and the extra length storage case can be locked at a low cost. It is in.

[0008]

The structure of the present invention for achieving the above object will be described. The present invention has a box body made of a hexahedron whose one surface is an opening, and a drawing light is provided in the box body. The end of the fiber cable is introduced, the optical fiber core wire for drawing is led out from the end of the optical fiber cable for drawing in the box body, and the extra length part of the optical fiber core wire for drawing in the box body. In the optical fiber connection box in which an extra length storage case for storing is installed, and the extra length storage case is supported by the box body so as to be drawn out toward the opening side, the extra length storage case facing the opening is provided. On the front surface, a plug-in type core wire connecting portion between the pull-in optical fiber core wire in the extra length storage case and the drop-out optical fiber core wire outside the extra length storage case is provided in the extra length storage case. It is installed through the front surface and An auxiliary door that protects the rising portion of the pull-in optical fiber core wire and prevents the extra length storage case from slipping out is provided on the front surface of the box body on the side where the optical fiber core wire for standing rises. Is characterized by.

[0009]

As described above, the plug-in type optical fiber connecting portion between the pull-in optical fiber core inside the extra length storage case and the pull-out optical fiber core outside the extra length storage case is provided in the extra length storage case. If it is provided so as to penetrate the front surface of the optical fiber, the work of changing the connection of the optical fiber core wire for withdrawal can be easily performed outside the extra length storage case.

If an auxiliary door for protecting the rising portion of the pull-in optical fiber core wire is provided on the front surface of the box on the side where the pull-in optical fiber core wire rises, the pull-in optical fiber core wire can be stored safely. can do.

Further, since the auxiliary door also serves to prevent the extra length storage case from slipping out, it is not necessary to specially provide a lock tool for the extra length storage case, and the cost can be reduced.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIG. 6 described above are denoted by the same reference numerals.

FIG. 1 shows a first embodiment of an optical fiber connection box according to the present invention. Each extra length storage case 6 in the optical fiber connection box of the present embodiment is supported on the back surface 2b of the box body 2 by a slide guide (not shown) so as to be drawn out toward the opening 1 side. The extra lengths of the pull-in optical fiber core wires 5 are stored in the extra length storage cases 6, respectively.

The core connecting portion 9 between the pull-in optical fiber core wire 5 in the extra length storage case 6 and the pull-out optical fiber core wire 8 outside the extra length storage case 6 has a plug-in type structure. It is provided so as to penetrate the front surface of the extra length storage case 6 facing the opening 1. That is, the plug-in type optical fiber connecting portion 9 inserts the connector 11 of the optical fiber optical fiber 5 for pulling in and the connector 12 of the optical fiber optical fiber 8 for withdrawing from both sides of the cylindrical adapter 10 and abuts them. The adapter 10 is attached by passing the adapter 10 through the through hole 13 of the extra length storage case 6 and fixing the flange 14 of the adapter 10 to the extra length storage case 6.

Therefore, since the plug-in type core wire connecting portion 9 is of the plug-in type, the extra length can be accommodated by pulling out the connector 12 of the pull-down optical fiber core wire 8 outside the extra length housing case 6. The connection can be changed without changing the inside of the case 6.

When the retractable optical fiber core wire 5 is stored in the extra length storage case 6, the workability is improved by pulling the extra length storage case 6 toward you.

An auxiliary door 15 is provided on the front surface of the box 2 on the side where the pull-in optical fiber core wire 5 stands up to protect the rising portion of the pull-in optical fiber core wire 5 and prevent the extra length storage case 6 from slipping out. Is supported by a cantilever so that it can be opened and closed. Therefore, the auxiliary door 15 is provided close to the front surface of the extra length storage case 6.

In the case of the present embodiment, since the work of changing the connection of the pull-down optical fiber core wire 8 can be performed outside the extra length storage case 6, the extra length portion of the pull-in optical fiber core wire 5 is stored in the extra length storage case 6. There is no problem even if the extra length storage case 6 is fixed by the auxiliary door 15 after the storage.

The auxiliary door 15 is provided with a length that does not press the plug-in type core wire connecting portion 9 of the extra length storage case 6. Therefore, it is possible to avoid pressurizing the optical fiber core wire 8 for withdrawing outside the extra length storage case 6.

The opening on the right side of the box body 2 can be protected by another door or the like at the front end of the box body 2 if necessary.

FIG. 3 and FIG. 4 show another embodiment of the optical fiber connection box according to the present invention. The parts corresponding to those in FIG. 1 described above are denoted by the same reference numerals.

In the optical fiber junction box of this embodiment, an extra length storage case 16 for the optical fiber core wire 8 for pulling down is provided in the box body 2 adjacent to the right side of the extra length storage case 6 so as to be freely drawn. ing. The extra length storage case 16 is adapted to accommodate the extra length portion of the optical fiber cable 8 for withdrawal in the optical fiber cable 18 for withdrawal that passes through the cutout groove 17 in the bottom surface 2a of the box body 2. There is.

On the left side of the opening 1 of the box body 2, the opening 1
The auxiliary door 15 is provided in the same manner as in FIG.

On the right side of the opening 1 of the box body 2, an opening / closing door 7 of the opening 1 is provided so as to be openable and closable.

FIG. 5 shows an example of slide guides 19 and 20 which support the extra length storage cases 6 and 16 in the optical fiber connection box shown in FIGS. These slide guides 19 and 20 are provided so as to protrude from the back surface 2b of the box body 2 in pairs.

In order to insert the slide guides 19 and 20 as described above, slide guide insertion holes (not shown) are provided in the front and rear directions on the back surfaces of the extra length storage cases 6 and 16, respectively.

[0027]

As described above, according to the optical fiber connection box of the present invention, the following effects can be obtained.

(1) A plug-in type optical fiber connecting portion between the pull-in optical fiber core wire inside the extra length storage case and the pull-out optical fiber core wire outside the extra length storage case is connected to the extra length storage case. Since it is provided so as to penetrate the front surface of the optical fiber, the work of changing the connection of the optical fiber core wire for withdrawal can be easily performed outside the extra length storage case.

(2) Since the auxiliary door for protecting the rising portion of the pull-in optical fiber core wire is provided on the front surface of the box on the side where the pull-in optical fiber core wire rises, the pull-in optical fiber core wire is safe. Can be stored in.

(3) Since this auxiliary door also serves to prevent the extra length storage case from slipping out, there is no need to provide a special locking tool for the extra length storage case, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an optical fiber connection box according to the present invention.

FIG. 2 is an exploded perspective view showing an example of a core wire connecting portion used in FIG.

FIG. 3 is a perspective view of another embodiment of the optical fiber junction box according to the present invention.

FIG. 4 is a cross-sectional view of the optical fiber junction box shown in FIG.

5 is a perspective view showing an example of a slide guide that supports an extra length storage case in the box body of the optical fiber connection box shown in FIG.

FIG. 6 is a perspective view of a conventional optical fiber connection box.

[Explanation of symbols]

 1 Opening 2 Box 2a Bottom 2b Back 3 Notch Groove 4 Optical fiber cable for pulling in 5 Optical fiber core wire for pulling in 6 Extra length storage case 7 Opening door 8 Optical fiber core wire for pulling down 9 Plug-in type core wire connection Part 10 Adapter 11 Connector 12 Connector 13 Through hole 14 Flange 15 Auxiliary door 16 Extra length storage case 17 Notched groove 18 Optical fiber cable for pulling down 19, 20 Slide guide

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Sugita 5-23-8 Nishigotanda, Shinagawa-ku, Tokyo Incorporated in Seiden Co., Ltd. (72) Inventor Toshihide Asano 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Date (72) Inventor Akira Sugawara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Co., Ltd.

Claims (1)

[Claims] 1. A box body having a hexahedron whose one surface is an opening, and an end portion of the pull-in optical fiber cable is introduced into the box body, and the end of the pull-in optical fiber cable is inside the box body. The optical fiber core wire for lead-in is led out from the portion, and an extra length storage case for accommodating the extra length portion of the optical fiber core wire for introduction is installed in the box body, and the extra length storage case is on the opening side. In the optical fiber splicing box supported in the box body so as to be freely drawn out, the front end of the extra length storage case facing the opening is provided with the optical fiber core wire for drawing in the extra length storage case and the extra length. A plug-in type optical fiber connecting portion with the optical fiber core wire for pulling out outside the long storage case is provided so as to penetrate through the front surface of the extra length storage case, and the optical fiber core wire for pull-in is provided on the rising side. On the front of the box is the optical fiber Optical fiber connection box, characterized in that the auxiliary door for preventing coming off of the excess length storage case is provided to protect the rising portion of the driver conductor.