Optical fiber connection box

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to an optical fiber junction box in which an extra length storage case is installed inside the box.

【0002】

[Conventional technology]

As shown in FIG. 6, a conventional optical fiber junction box of this type has a box body 2 composed of a hexahedron having one side opened as an opening 1. A notch groove 3 is provided on the bottom surface 2a of the box body 2, and the lead-in optical fiber cable 4 is drawn into the box body 2 from the notch groove 3. A plurality of lead-in optical fiber core wires 5 are derived from the end of the lead-in lead-in optical fiber cable 4. The lead-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 lead-in optical fiber core wire 5 is connected to each other by a lead-down optical fiber core wire of a pull-down optical fiber cable (not shown) and a core wire connection portion. The opening 1 of the box body 2 is closed by the opening / closing door 7.

【0003】

In such an optical fiber junction box, the lead-in optical fiber cable 4 and the withdrawal optical fiber core wire 5 are under the control of a communication service provider such as NTT, and the withdrawal optical fiber cable and the withdrawal optical fiber (not shown) are used. The fiber optic core is under the control of the user.

【0004】

[Problems to be Solved by the Invention]

In such an optical fiber junction box, since the core wire connection portion between the lead-in optical fiber core wire 5 and the pull-down optical fiber core wire is provided in the extra length storage case 6, work such as connection change can be performed. There was a difficult problem.

【0005】

In addition, the lead-in optical fiber cable 4 and the lead-in optical fiber core wire 5 are not tampered with once they have been laid, but the lead-in optical fiber core wire (not shown) is tampered with relatively frequently for reconnection, etc. There are many. At the time of such reconnection of the withdrawal optical fiber core wire, there is a risk that the lead-in optical fiber core wire 5 may be accidentally pushed, pulled or hit by a working device or the like to be damaged.

【0006】

Further, since the conventional drawer type extra length storage case 6 is locked to the box body 2 so as not to come out with a special lock tool, there is a problem that the cost is increased by the amount of each lock tool. ..

【0007】

An object of the present invention is to provide an optical fiber junction box which can easily perform operations such as reconnection, can safely store a lead-in optical fiber core wire, and can lock an extra length storage case at low cost.

【0008】

[Means for solving problems]

Explaining the configuration of the present invention that achieves the above object, the present invention has a box body made of a hexahedron having an opening on one side, and an end portion of a lead-in optical fiber cable is introduced into the box body. A lead-in optical fiber core wire is led out from the end of the lead-in optical fiber cable inside the box, and an extra length storage case for accommodating the extra length portion of the lead-in optical fiber core wire is installed inside the box. The extra length storage case is an optical fiber connection box that is freely pulled out toward the opening side and is supported by the box body. The extra length storage case is on the front surface of the extra length storage case facing the opening. A plug-in type core wire connection portion between the lead-in optical fiber core wire inside and the pull-out optical fiber core wire outside the extra length storage case is provided so as to penetrate the front surface of the extra length storage case. An auxiliary door is provided on the front surface of the box on the side where the lead-in optical fiber core wire rises to protect the rising portion of the lead-in optical fiber core wire and prevent the extra length storage case from coming off. It is characterized by.

【0009】

[Action]

In this way, the plug-in type core wire connection portion between the lead-in optical fiber core wire inside the extra length storage case and the withdrawal optical fiber core wire outside the extra length storage case is attached to the front surface of the extra length storage case. If it is provided so as to penetrate, the work of changing the connection of the optical fiber core wire for pulling down can be easily performed outside the extra length storage case.

【0010】

In addition, if an auxiliary door is provided on the front surface of the box on the side where the lead-in optical fiber core wire rises to protect the rising portion of the lead-in optical fiber core wire, the lead-in optical fiber core wire can be safely stored. it can.

【0011】

Further, since this auxiliary door also has a role of preventing the extra length storage case from coming off, it is not necessary to provide a special lock tool for the extra length storage case, and the cost can be reduced.

【0012】

[Example]

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. The parts corresponding to FIG. 6 described above are shown with the same reference numerals.

【0013】

FIG. 1 shows a first embodiment of the optical fiber junction box according to the present invention. Each extra length storage case 6 in the optical fiber junction box of this embodiment is supported on the back surface 2b of the box body 2 by a slide guide (not shown) that can be pulled out to the opening 1 side. The extra length portion of each lead-in optical fiber core wire 5 is housed in these extra length storage cases 6.

【0014】

The core wire connection portion 9 between the lead-in optical fiber core wire 5 inside the extra length storage case 6 and the withdrawal 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 core wire connecting portion 9 inserts the connector 11 of the lead-in optical fiber core wire 5 and the connector 12 of the withdrawal optical fiber core wire 8 from both sides of the tubular adapter 10 and butt them together. It 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.

【0015】

Therefore, since such a plug-in type core wire connection portion 9 is a plug-in type, by pulling out the connector 12 of the withdrawal optical fiber core wire 8 outside the extra length storage case 6, the inside of the extra length storage case 6 It is possible to change the connection without modifying.

【0016】

When storing the lead-in optical fiber core wire 5 in the extra length storage case 6, pulling out the extra length storage case 6 toward you improves workability.

【0017】

An auxiliary door 15 that protects the rising portion of the lead-in optical fiber core wire 5 and prevents the extra length storage case 6 from coming off is cantilevered on the front surface of the box body 2 on the side where the lead-in optical fiber core wire 5 rises. It is provided so that it can be opened and closed with a support. Therefore, the auxiliary door 15 is provided close to the front surface of the extra length storage case 6.

【0018】

In the case of this embodiment, since the connection change work of the withdrawal optical fiber core wire 8 can be performed outside the extra length storage case 6, the extra length portion of the lead-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 later with the auxiliary door 15.

【0019】

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

【0020】

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.

【0021】

3 and 4 show other examples of the optical fiber junction box according to the present invention. The parts corresponding to FIG. 1 described above are designated by the same reference numerals.

【0022】

In the optical fiber junction box of this embodiment, the extra length storage case 16 of the withdrawal optical fiber core wire 8 is provided in the box body 2 adjacent to the right side of the extra length storage case 6 so as to be retractable. The extra length storage case 16 accommodates the extra length portion of the withdrawal optical fiber core wire 8 in the withdrawal optical fiber cable 18 passing through the notch groove 17 of the bottom surface 2a of the box body 2. There is.

【0023】

On the left side of the opening 1 of the box body 2, an auxiliary door 15 is provided so as to be retracted from the front end of the opening 1 in the same manner as in FIG.

【0024】

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 / closable.

【0025】

FIG. 5 shows an example of slide guides 19 and 20 in which the extra length storage cases 6 and 16 are freely pulled out and supported by the optical fiber junction boxes shown in FIGS. 3 and 4. These slide guides 19 and 20 are projected in pairs from the back surface 2b of the box body 2, respectively.

【0026】

In order to insert such slide guides 19 and 20, slide guide insertion holes are provided in the front-rear direction on the back surfaces of the extra length storage cases 6 and 16, although not shown.

【0027】

[Effect of the invention]

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

【0028】

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

【0029】

(2) An auxiliary door is provided on the front of the box on the side where the lead-in optical fiber core wire rises to protect the rising part of the lead-in optical fiber core wire, so the lead-in optical fiber core wire can be safely stored. be able to.

【0030】

(3) Since this auxiliary door also serves to prevent the extra length storage case from coming off, it is not necessary to provide a special lock for the extra length storage case, and the cost can be reduced.

[Simple explanation of drawings]

[Figure 1]

It is a perspective view of one Example of the optical fiber junction box which concerns on this invention.

[Figure 2]

It is an exploded perspective view which shows an example of the core wire connection part used in FIG.

[Fig. 3]

It is a perspective view of another Example of the optical fiber junction box which concerns on this invention.

[Fig. 4]

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

[Fig. 5]

It is a perspective view which shows the example of the slide guide which supports the extra length storage case in the box body of the optical fiber junction box shown in FIG.

[Fig. 6]

It is a perspective view of the conventional optical fiber junction box.

[Explanation of symbols]

1 opening 2 Box 2a bottom 2b back 3 Notch groove 4 Fiber optic cable for pull-in 5 Optical fiber core wire for lead-in 6 Extra length storage case 7 Open / close door 8 Optical fiber core wire for withdrawal 9 Plug-in core wire connection 10 adapter 11 Connector 12 connector 13 Through hole 14 flange 15 Auxiliary door 16 Extra length storage case 17 Notch groove 18 Fiber optic cable for withdrawal 19,20 slide guide