JP2817583B2 - Wiring switching board for optical fiber cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring switchboard for an optical fiber cable used in an optical fiber communication system, and more particularly to a wiring switchboard provided between an optical line and an optical terminal unit. is there.

[0002]

2. Description of the Related Art Generally, central equipment (master station) and terminal equipment are used.
When transmitting signals (information) such as video and audio to and from (substations), a signal transmission path is formed between these devices. In particular, in recent optical fiber communication systems, an optical fiber cable (optical line) with a high density is applied as a signal transmission path.

In an optical fiber communication system, when a distribution connection or line switching is performed between a wiring optical fiber cable on a terminal device side and a high-density optical fiber cable, an extra length for work is necessary. There are many constraint conditions, such as that the curvature at the time of bending does not become too small to prevent an increase in loss. Therefore, conventionally, in order to facilitate such work, a wiring switching board is provided between the high-density optical fiber cable and the wiring optical fiber cable.

FIG. 4 shows the internal structure of a conventional optical fiber cable wiring switching board 1, and FIG. In the wiring switching board 1, a high-density optical fiber cable 2 and a plurality of wiring optical fiber cables 3, 3... From the ends of the two optical fiber cables 2 and 3, a large number of fiber cores 5 and 6 are respectively drawn out, and these fiber cores 5 and 6 are patch cords (optical cords with connectors at both ends) at appropriate heights. 9 and optical connectors 10 and 10. On both sides of these connector connection portions, multi-core fiber storage trays 7a and 7b for storing the extra lengths of the fiber cores 5 and 6 are provided in multiple stages. In the middle of the two connector connecting portions, a cord extra length storage tray 8 for accommodating the extra length of the patch cord 9 is similarly provided in multiple stages, whereby the core wires 5, 6
In addition, the extra length storing operation and the connecting operation of the cord 9 are simplified. Reference numerals 11 and 11 denote mounting panels provided between the extra-core-length storage trays 7a and 7b and the extra-code-length storage tray 8, and the optical connectors 10 are mounted on the mounting panels 11 at intervals in the vertical direction. Will be retained.

[0005]

However, in the above-described conventional wiring switching board 1, the storage trays 7a, 7
When the extra lengths are stored on the predetermined storage trays 7a, 7b, 8 because the b and 8 are fixedly provided in the panel body 4, first, the predetermined length is set in the space in front of the trays 7a, 7b, 8. After taking extra length at the curvature of the upper tray 7a, 7
It has to be inserted from the gap between b and 8, and there is a problem that the extra-length storing operation is still complicated. In addition, when the storage trays 7a, 7b, 8 are fixed to the panel body 4, lines that are not necessary interfere with the work when connecting or switching the lines, thus impairing the workability.

On the other hand, the size of the gap between the upper and lower storage trays 7a, 7a (or 8
(Or the cord 9) needs to have a size larger than the binding diameter of the cord and the size that can be stored with a fingertip of a human.
For this reason, the gaps between the trays 7a, 7a (or 8, 8) cannot be reduced, so that high-density extra length storage cannot be performed, and the size of the panel itself becomes large, which is disadvantageous in terms of cost and installation work. In addition, the distance between the storage trays 7a and 7b and the connector connection portion needs to be large so as not to hinder the operation of inserting and removing the optical connector 10. This also leads to a decrease in mounting density and an increase in size of the structure. I was

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to make it possible to easily carry out extra length storing work and line switching work, and to reduce the size of the optical fiber cable and to increase the packing density. An object of the present invention is to provide a wiring switching board.

[0008]

Means for Solving the Problems The present invention to achieve the above object, a core wire excess length accommodating tray for accommodating the extra length of the fiber on both sides of the panel body, the central portion of the panel body The cord extra length storage trays for storing the extra lengths of the patch cords are provided in multiple stages, and the outer corners of the core extra length storage trays are rotatably supported by pre-established supports, and the left and right
When the extra length storage trays are rotated in opposite directions,
Then, move both sides of the extra cord length storage tray
Each of the extended guide members is independently slidably supported
Cable switching board for optical fiber cables
Biasing means for returning the rays to their initial positions,
By using the bolts against the urging force of the urging means,
At the rotation angle of 30 ° and the cord
A tray that stops the extra length storage tray at a predetermined amount
A stationary means is provided .

[0009]

[0010]

According to the above construction, the corners of the extra-core-length storage tray are supported by the columns so that they can be independently rotated forward, and the extra-length-code storage tray is slidable in the front-rear direction. An arbitrary tray can be pulled out from the stacked storage trays. For this reason, at the time of the extra-length storing operation, it is only necessary to extra-length the core wire or the cord at a predetermined curvature on the drawn-out storage tray, and the extra-long storing operation can be performed extremely easily. In addition, line connection and switching operations can be performed without being disturbed by other lines, so that these operations are extremely simple.

Further, by pulling out the predetermined storage tray toward the front and storing the extra length, there is no need to insert an extra length from the gap between the trays as in the prior art, and the gap between the upper and lower trays is reduced. The mounting density can be increased.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan sectional view showing a wiring switching board for an optical fiber cable according to this embodiment. In the figure, reference numeral 4 denotes a board main body formed in a substantially box shape, and an opening 4a for performing extra-length storage work or the like is formed in the front of the board main body 4. On both sides in the panel body 4, as in the conventional case, core-line extra-length storage trays 7a and 7b for storing the extra lengths of the fiber cores 5 and 6 are provided in multiple stages at intervals in the vertical direction. A cord extra length storage tray 8 for accommodating the extra length of the patch cord 9 is similarly provided in a multi-stage at a central portion in the panel body 4.

The extra cord storage tray 8 is slidably supported by a pair of cylindrical shafts (guide members) 13, 13 extending forward from a mounting base plate 12 installed in the panel body 4. Thus, any tray 8 can be pulled out to the front. That is, as shown in FIG. 2, a pair of cylindrical shafts 13, 13 are mounted in a multi-stage manner on the front surface of the mounting base plate 12 at intervals in the vertical direction. The shafts 13 of each stage are
Sliders 14 and 14 attached to both sides of the tray 8 are fitted around the shafts 13 and 13 at predetermined intervals in parallel with each other.

As shown in FIG. 1, a flange-shaped stopper 15 for preventing the tray 8 from falling off is formed integrally with the tip of the cylindrical shaft 13.
A compression coil spring 16 (biasing means) is mounted. The coil spring 16 is interposed between the slider 14 and the stopper 15 and constantly urges the tray 8 toward the retracted side. On the other hand, the slider 14 incorporates a tray stopping means (not shown) for stopping the tray 8 at a predetermined draw-out position. As the tray stationary means, for example, an adjuster bolt is used. When the tray 8 is pulled out to a predetermined position, the adjuster bolt enters a groove or a hole formed on the shaft 13 and resists the urging force of the spring 16. Tray 8 can be stopped.

The extra core length storage trays 7a, 7b are supported by columns 17a, 17 standing upright in front of the mounting base plate 12.
b, so that any trays 7a and 7b can be pulled out to the front alone. That is, on both front sides of the mounting base plate 12, columnar columns 17a and 17b are erected in parallel with each other, and these columns 17a and 17b
The outer corners of a and 7b are rotatably pivoted. As shown in FIG. 3, a collar 18b is attached to the outer corners of the extra core storage trays 7a and 7b, and the collar 18b is fitted to the column 17a and fixed to the column 17a from above and below. By holding the tray 7a between the collars 18a and 18c, the tray 7a can be rotated around the support 17a.

The extra-core-length storage trays 7a, 7
In the same manner as described above, a biasing means such as a wire spring and a tray stationary means such as an adjuster bolt are incorporated in the support portion b, and the tray 7a is set at a predetermined angle (30).
°), the tray 7a can be stopped against the urging force when the tray 7a is rotated forward.

According to the wiring switching board having the above construction, the extra-core-length storage trays 7a and 7b and the extra-cord-length storage tray 8 can be independently pulled out to the front, so that when the extra-length storage operation is carried out, they are stacked in multiple stages. Any of the trays 7a, 7b, 8 is pulled out from the storage trays 7a, 7b, 8 which have been drawn, and the core wires 5, 6 or the cord 9 are extra-length-extracted on the drawn trays 7a, 7b, 8 at a predetermined curvature. Then, the trays 7a, 7b, and 8 may be returned to their original positions, and the extra-length storage operation can be performed extremely easily. In addition, line connection and switching work can be performed using predetermined storage trays 7a, 7b,
8 can be easily carried out without being disturbed by other lines by being pulled out to the front.

Further, the tray 7a,
Since the 7b and 8 are stopped at a predetermined angle or withdrawal amount, the extra-length storing operation can be easily performed in this point, and there is no possibility that the trays 7a, 7b and 8 are pulled out more than necessary. Good transmission characteristics can be ensured without damaging the fiber cores 5 and 6 and the patch cord 9.

Further, since the extra lengths of the storage trays 7a, 7b, 8 can be individually pulled out to perform the extra length storage operation, it is not necessary to insert an extra length from the gap between the trays as in the conventional case, and the interval between the trays can be reduced. The mounting density can be greatly improved. Therefore, the size of the panel itself can be reduced and the price can be reduced, and the installation work can be easily performed.
Particularly, in the present embodiment, the extra-core-length storage trays 7a and 7b are rotated in opposite directions to each other, so-called double-open, so that the distance between the trays 7a and 7b and the connection portion of the optical connector 10 can be reduced. Also in this respect, it is possible to achieve a higher packaging density and a smaller size.

Further, it is possible to easily check whether or not the storage trays 7a, 7b, 8 are stored in the storage trays 7a, 7b, 8 with an extra length having a predetermined curvature without twisting or the like, simply by pulling out the trays 7a, 7b, 8. it can. Conventionally, the soundness of the extra length is checked by checking the upper and lower storage trays 7a, 7a (or 8, 8).
Can not only visually from the gap comrades, not sufficient in terms of properties guarantees.

[0022]

In summary, according to the present invention, the following excellent effects are exhibited.

An arbitrary tray can be pulled out of the multi-tiered extra-core storage tray and the extra-code storage tray, so that the extra storage of cores or cords, connection and wiring switching can be performed. Each operation can be performed extremely easily. In addition, the gap between the upper and lower storage trays can be reduced, and the area occupied by the mounting can be reduced.

Further , since the storage tray is held at the rotation angle of 30 ° or the drawn-out position, the workability can be further improved, and at the same time, the core wire and the cord can be prevented from being damaged and the quality can be maintained.

[Brief description of the drawings]

FIG. 1 is a partially omitted plan sectional view showing an embodiment of an optical fiber cable wiring switching board of the present invention.

FIG. 2 is a front view showing a mounted state of an extra-core-length storage tray in the optical fiber cable wiring switching board;

FIG. 3 is a front view showing a mounting state of a cord extra length storage tray in the optical fiber cable wiring switching panel.

FIG. 4 is a front view showing the internal structure of a conventional optical fiber cable wiring switching panel.

FIG. 5 is a view taken in the direction of arrows AA in FIG. 4;

[Explanation of symbols]

 2 High Density Optical Fiber Cable 3 Optical Fiber Cable for Wiring 4 Panel Body 5, 6 Fiber Core Wire 7a, 7b Extra Wire Storage Tray 8 Extra Cord Storage Tray 9 Patch Cord 10 Optical Connector 13 Cylindrical Shaft 14 Slider 16 Coil spring (biasing means) 17a, 17b Support

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-228002 (JP, A) JP-A-2-90804 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 6/00 336

Claims (1)

(57) [Claims] 1. An extra-core storage tray for storing extra fiber cores on both sides in a panel main body, and a cord extra-length storage tray for storing extra patch cords in a central portion of the panel main body. Each of the trays is provided in a multi-stage shape, and the outer corners of the extra-core storage tray are rotatably supported on pre-established supports, and the left and right
When the extra length storage trays are rotated in opposite directions,
Then, move both sides of the extra cord length storage tray
Each of the extended guide members is independently slidably supported
Urging means for returning both trays to their initial positions in the optical fiber cable wiring switching panel.
And adjuster bolts to resist the urging force of the urging means.
At the rotation angle of 30 °.
The storage tray with a predetermined draw-out amount
A wiring switching board for an optical fiber cable, comprising a tray stationary means .