JP2002122745A - Slack storage tray for optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slack storage tray for an optical cable, which facilitates slack storing work, reduces a work load and simplifies work by a looping guide function so that coated optical fibers do not exceed a pre-determined radius of curvature. SOLUTION: The slack storage tray for the optical fiber cable is provided with a coated optical fiber introducing port, into which a first coated optical fiber is introduced together with a second coated optical fiber from the same direction, a sleeve-clamping part which is provided in the slack storage tray, an external winding wire storage part which is a partition for winding and storing slacks of the first coated optical fiber and the second coated optical fiber introduced from the coated optical fiber lead-in port, a first coated optical fiber storage part which stores the coated optical fiber into a nearly C-shape or in a nearly 6-shape from the coated optical fiber introducing port to the sleeve-clamping part, and a second coated optical fiber storage part, which stores the coated optical fiber in a nearly inverted S-shape or in a nearly inverted δ-shape from the coated optical fiber lead-in port to the sleeve clamping part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusion splicing section of two core wires of an optical fiber cable, which is disposed in an optical fiber cable distribution box or the like provided at a relay point of the optical fiber cable. Further, the present invention relates to a surplus storage tray in which the surplus portions of two core wires arranged so as to exceed a predetermined radius of curvature are stored together.

[0002]

2. Description of the Related Art In recent years, the need for large-capacity data communication such as the so-called Internet has been increasing. Therefore,
Communication lines using optical fiber cables capable of transmitting a large amount of data are being developed. Since the length of the optical fiber cable is limited, the cores of the optical fiber cables are connected to each other inside an optical fiber cable distribution box or the like provided at a relay point.

[0003] Here, as is well known, an optical fiber cable is a single tape having a single core wire or a two-core, four-core, or eight-core wire as one unit around a tension member at a central portion. In general, there is a structure in which a large number of core units including a plurality of core wires of one core and one tape are collectively referred to as a core wire), and these are covered with a covering material to form a cable. When such optical fiber cables are connected to each other, they are connected by abutting the ends of the core wires drawn out of the core unit in the sleeve and heat-welding them. In this case, the core wire is connected after having a loop-shaped surplus portion in order to allow a margin. An extra-length storage tray that collectively accommodates the extra length portion of the core wire and the fusion spliced portion is disposed in the optical fiber cable distribution box.

When the extra length portion and the fusion spliced portion of such a core wire are collectively accommodated in an extra length accommodation tray, the following problem has occurred. (1) The core of the optical fiber is vulnerable to bending, and must not be bent beyond a predetermined radius of curvature.
However, when storing the extra length of the core of the optical fiber in the extra length storage tray, first, the work of winding and accommodating the extra length of the core of the optical fiber to an appropriate diameter (hereinafter referred to as “rotation”) is performed. Thereafter, the optical fiber was placed in the extra-length storage tray, but if the operator was not skilled, the optical fiber could be bent beyond the radius of curvature and the optical fiber core could be damaged.

(2) In addition, even a skilled worker,
It is necessary to work so as not to bend beyond a predetermined radius of curvature, and the work load is excessive, such as requiring attention. In addition, even a skilled worker may inadvertently bend beyond the predetermined radius of curvature, applying excessive force to the core wire and, in extreme cases, detaching the fusion spliced part. May also occur.

[0006]

SUMMARY OF THE INVENTION These (1) and (2)
The problem described in (1) can be solved by making the core of the optical fiber not exceed a predetermined radius of curvature. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a guide function for turning the optical fiber so that the core wire does not exceed a predetermined radius of curvature. An object of the present invention is to provide an extra-length storage tray for optical fiber cables that facilitates long-storing work, reduces the work load, and simplifies the work.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is a method of fusion-splicing two cores of an optical fiber cable and a predetermined radius of curvature. The extra length of the two core wires arranged so as to exceed the length of the first core wire and the second core wire in the extra length storage tray accommodated together are set in the extra length storage tray. A core wire inlet provided, a sleeve holding portion formed of a plurality of holding protrusions provided on the extra length storage tray, and a sleeve holding portion for winding and storing the excess length of the first core wire and the second core wire from the core wire inlet. An outer winding accommodating portion that is a partition that takes a path of a substantially circular core wire outside the wire, and a substantially C-shaped or approximately six from the core wire introduction port to the sleeve holding portion.
A first core wire accommodating portion, which is a partition for taking a path of the first core wire in a character shape, and a substantially inverted S from the core wire introduction port to the sleeve holding portion.
And a second core wire accommodating portion that is a partition that takes a path of the second core wire in a letter shape or a substantially inverted δ shape.

According to a second aspect of the present invention, there is provided an optical fiber cable extra length storage tray according to the first aspect,
The partition that takes the path of the core wire in a substantially circular shape of the outer winding housing portion has a plurality of first walls provided on the outer circumference of the circular extra-length storage tray, and a core wire introduction port is provided by a notch. The partition formed by the second wall for partition having a substantially circular shape as viewed from the front and taking the path of the core wire in a substantially C-shape or substantially six-shape of the first core wire accommodating portion is the second wall for partition and the partition for the partition. A substantially C-shaped third partition wall in front view provided inside the second wall, a substantially inverted S-shaped fourth partition wall in front view provided inside the second partition wall, A fifth circular partition wall, which is provided inside the second partition wall and has a substantially circular shape when viewed from the front, and a sixth partition wall which is provided inside the second partition wall and has a substantially human shape when viewed from the front. The partition that takes the path of the core wire in a substantially inverted S-shape or a substantially inverted δ-shape of the second core wire accommodating portion is the fourth for the partition.
It is formed by a wall, the fifth partition wall, and the sixth partition wall.

According to a third aspect of the present invention, there is provided an optical fiber cable extra length storage tray according to the second aspect,
Extra length holders extend from all or any of the plurality of first walls for partition, second walls for partition, third walls for partition, fourth walls for partition, fifth walls for partition, or sixth walls for partition. It is characterized by coming out.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of an extra-length storage tray for an optical fiber cable according to an embodiment of the present invention. 1A and 1B are diagrams showing a surplus storage tray of the present embodiment, wherein FIG. 1A is a front view, FIG. 1B is a left side view, and FIG.
(C) is a bottom view. 2A and 2B are diagrams showing the extra length storage tray, wherein FIG. 2A is a rear view, and FIG.
FIG. 4 is a cross-sectional view taken along a line A. Note that FIG. 2B shows only a cut surface for clarity of the drawing.

First, the configuration of the extra length storage tray will be described. As shown in FIGS. 1A and 2A, the extra length storage tray 1 has a circular tray bottom surface 2 as a base, and a plurality of first partition walls 3 provided on the outer periphery of the tray bottom surface 2. It is protruded by. Here, the first partition walls 3 are arranged alternately with the notches. A second partitioning wall 4 that forms a concentric circle with a diameter smaller than the outer circumference of the tray bottom surface 2 and has a notch (located at the lower side in FIG. 1A) protrudes from the tray bottom surface 2. Is done.

Further, the extra length retainers 3a, 4 are alternately protruded from the first partition wall 3 and the second partition wall 4.
a is provided. As is clear from FIGS. 1 (b), 1 (c) and 2 (b), the extra-length retainers 3a and 4a are located above the first partition wall 3 and the second partition wall 4. It is formed so as to project inward from the end.

A plurality of first partition walls 3 provided on the outer periphery of the circular extra-length storage tray 1 and a substantially circular second partition wall 4 in a front view provided with cutouts are formed by outer windings. A partition that takes the path of the substantially circular core wire of the storage section (see FIG. 3).

As shown in FIG. 1A, a first core wire accommodating portion serving as a path for accommodating the first core wire is formed inside the second partition wall 4, so that the first core wire accommodating portion has a substantially C-shape in a front view. Third partition wall 5
Are protruded from the tray bottom surface 2. The second partition wall 4 and the third partition wall 5 serve as partitions that take the path of a substantially C-shaped first core wire (see FIG. 4) that is a first core wire accommodating portion. Further, inside the second partition wall 4, as shown in FIG. 1 (a), in addition to the third partition wall 5, a fourth wall 6 having a substantially inverted S-shape in front view and a fourth wall 6 in front view are provided. A fifth partition wall 7 having a circular shape and a sixth partition wall 8 having a substantially human shape in a front view are provided, and a path of a first core wire having a substantially 6-letter shape in a front view as a first core wire accommodating portion (FIG. See)). In this case, the path of the substantially 6-shaped core wire as viewed from the front is a path obtained by adding a substantially O-shaped path to the path of the substantially C-shaped core wire.

Similarly, inside the second partition wall 4,
As shown in FIG. 1A, the partitioning fourth wall 6, the partitioning fifth wall 7 and the partitioning fifth wall 7, as shown in FIG. 6th wall 8 for partition
Are protruded from the tray bottom surface 2. The fourth partition wall 6, the fifth partition wall 7, and the sixth partition wall 8 are the second partition wall 6.
The path (see FIG. 6) of the substantially inverted S-shaped second core wire as viewed from the front, which is the core wire accommodating portion, or the second generally inverted δ (delta) -shaped second wire viewed from the front
A partition that takes the path of the core wire (see FIG. 7). In this case, the path of the substantially inverted δ-shaped core wire in front view is a path obtained by adding a substantially O-shaped path to the path of the substantially inverted S-shaped core wire in front view.

As shown in FIG. 3, the first core wire 20 and the second
In order for the core wires 30 to be introduced from the same direction, at the ends of the first core wire storage portion and the second core wire storage portion, as shown in FIG. A core wire inlet 9 is provided. Core wire inlet 9
Further, a core wire introduction port 9a for introducing into the outer winding accommodating portion, a core wire introduction port 9b for introducing into the first core wire accommodating portion, and a second
It has a core wire introduction port 9c for introducing into the core wire accommodating portion. The extra length storage tray 1 is a sleeve holding portion 1 comprising a plurality of holding protrusions 10 a provided to project from the tray bottom surface 2.
0 is provided.

As shown in FIG. 2A, the tray bottom surface 2 is provided with a large number of holes 11 (shown by oblique lines for clarity of the drawing). This is because the tray 1 is formed by resin molding using a metal mold, and the extra length pressers 3a and 4a described above are also formed by resin molding using a metal mold. When resin molding of the extra-length retainers 3a and 4a is performed, a mold for forming the extra-length retainers 3a and 4a is formed by a lower die and an upper die.
The mold is formed by removing the lower mold from the mold. The extra length storage tray 1 is configured as described above.

Next, the outer winding accommodating portion, the first core wire accommodating portion, and the second core wire accommodating portion provided by the first to sixth walls for partitioning will be described. FIG. 3 to FIG. 7 are explanatory diagrams illustrating accommodation of the core wire. In the outer winding accommodating portion, as shown in FIG.
The core wire 20 and the second core wire 30 are introduced together, and the core wire introduction port 9 is provided.
a, the first core wire 20 and the second core wire 20 along the outer winding accommodating portion.
The core wire 30 is wound. In FIG. 3, the number of turns is only one, but the number of turns of the winding is double, three or three in accordance with the length of the extra length.
Weight is set as appropriate.

The first core wire 20 and the second core wire 30 appropriately wound and housed in the outer winding housing portion are directed to the first and second core wire housing portions near the core wire inlet 9 respectively. Placed. As shown in FIG. 4, the first core wire 20 receives the substantially C-shaped first core wire formed by the second partition wall 4 and the third partition wall 5 through the core wire inlet 9 b. And the end of the first core wire 20 reaches the sleeve holding portion 10.

Here, the first core wire accommodating portion can take a substantially C-shaped path as shown in FIG. 5 in addition to a substantially C-shaped path. The case of taking a substantially 6-shaped path is a case where the extra length is not enough if one turn is made by using the outer winding accommodating portion, but the extra length is provided if the C-shaped path is arranged. In this case, the extra length is finely adjusted by making one turn along the fifth circular partition wall 7. Either the substantially C-shaped path or the substantially six-shaped path is appropriately selected.

As shown in FIG. 6, the other second core wire 30 is connected to the second core wire 30 through the core wire inlet 9c.
The inverted S-shaped second core wire accommodating portion formed by the wall 4, the fourth partition wall 6, the circular fifth partition wall 7, and the substantially human-shaped sixth partition wall 8, It will reach the sleeve holding portion 10. Here, as shown in FIG. 7, the second core wire accommodating portion can take an inverted δ-shaped path instead of the inverted S-shaped path. The case of taking an inverted δ-shaped path means that when one turn is made using the outer winding accommodating portion, the extra length is not enough, but when the inverted S-shaped path is arranged, the extra length is excessive. It is used when fine adjustment of the surplus length is made by making one turn along the fifth use wall 7. Whether to take an inverted S-shaped path or an inverted δ-shaped path is appropriately selected.

The distal ends of the first core wire 20 passing through the first core wire accommodating portion and the second core wire 30 passing through the second core wire accommodating portion 20 are:
As shown in FIGS. 4 to 7, after fusion splicing, the sleeve 12 is covered with a sleeve 12, and the sleeve 12 is
By arranging at 0, the extra core length is accommodated.
In addition to the sleeve 12, it is also possible to arrange a coupler / connector or the like in the connection housing. FIG.
By appropriately combining the outer winding accommodating portion, the first core wire accommodating portion, and the second core wire accommodating portion described with reference to FIG. 7, it can be appropriately changed according to the length of the extra length.

In this embodiment, it is assumed that the number of core wires is one, such as one core, and the extra length storage tray 1 is relatively thin (see FIGS. 1B and 1C). And explained. However, although not shown, if one tape is an eight-core wire, the core wire has a large diameter, so the extra-length storage tray 1 is moved up and down (arrow B shown in FIG. 1B).
Need to be stretched. The thickness of the extra length storage tray 1 can be appropriately selected.

Further, in the present embodiment, the extra length pressers 3a,
4a is formed so as to protrude inward only from the upper ends of the first partition wall 3 and the second partition wall 4. However, the first partition wall 3 and the second partition wall 4 are formed. In addition to the two walls 4, if necessary, an extra-length holder is appropriately disposed on the third partition wall 5, the fourth partition wall 6, the fifth partition wall 7, or the sixth partition wall 8. However, the present invention can be implemented. It is also possible to appropriately select and arrange the extra-long press on all or a part of these walls.

[0025]

As described above, according to the present invention, the outer winding accommodating portion and the first
A core wire can be appropriately stored in the core wire storage portion, the second core wire storage portion, or the like. In addition, the first core 20
In addition, since the second core wire 30 is introduced, there is no division in the introduction direction, and a single operation can be performed.

Further, since the fusion splicing portion and the extra length portion are housed separately from each other, wiring is not made so that the fusion splicing portion and the extra length portion are mixed. Can also be accommodated in an easy-to-understand manner. In general, an optical fiber cable that provides a wheel guide function that keeps the optical fiber core wire from exceeding a predetermined radius of curvature, simplifies the work load, simplifies the work, and reduces the work load. Can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a surplus storage tray according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a surplus storage tray according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating accommodation of a core wire.

FIG. 4 is an explanatory diagram illustrating accommodation of a core wire.

FIG. 5 is an explanatory diagram illustrating accommodation of a core wire.

FIG. 6 is an explanatory diagram illustrating accommodation of a core wire.

FIG. 7 is an explanatory diagram illustrating accommodation of a core wire.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 extra length storage tray 2 tray bottom 3 first wall for partition 3 a extra length holder 4 second wall for partition 4 a extra length holder 5 third wall for partition 6 fourth wall for partition 7 fifth wall for partition 8 8th partition 6 wall 9 core wire inlet 9a core wire inlet 9b core wire inlet 9c core wire inlet 10 sleeve holding part 10a holding protrusion 11 hole 12 sleeve 20 core wire 30 core wire

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Koji Soma, Inventor 1-2-2 Oshima, Koto-ku, Tokyo F-term (reference) 2H036 MA11 RA25 2H038 CA37 CA38

Claims (3)

[Claims] 1. A fusion spliced portion between two core wires of an optical fiber cable and an extra length portion of two core wires arranged so as to exceed a predetermined radius of curvature are housed together. In the extra length storage tray, a core wire introduction port provided in the extra length storage tray so that the first core wire and the second core wire are both introduced from the same direction, and a plurality of holding protrusions provided in the extra length storage tray. An outer winding accommodating portion that is a partition that takes a path of a substantially circular core wire outside the sleeve nipping portion for accommodating the extra lengths of the first core wire and the second core wire from the core wire introduction port. A first core wire accommodating portion, which is a partition that takes a path of the first core wire in a substantially C-shape or substantially six-character shape from the core wire introduction port to the sleeve holding portion, and substantially from the core wire introduction port to the sleeve holding portion. Inverted S-shaped or substantially inverted δ-shaped second core wire And a second core wire accommodating portion that is a partition for taking a path. 2. The extra length storage tray of an optical fiber cable according to claim 1, wherein a partition for taking a substantially circular path of the core wire of the outer winding accommodation portion is provided on an outer periphery of the circular extra length storage tray. A plurality of first walls for partitioning, and a second wall for partition having a substantially circular shape as viewed from the front, provided with a core wire introduction port by notch; The partition that takes the path of the core wire in the shape of a letter is formed by the second partition wall and the second partition wall.
A substantially C-shaped third partition wall in a front view provided inside the wall;
A fourth wall for partition having a substantially inverted S-shape in front view provided inside the second wall for partition, a fifth wall for partition substantially circular in front view provided inside the second wall for partition, and , The second partition
A partition formed by a sixth wall for partition having a substantially human-like shape as viewed from the front provided on the inner side of the wall, and taking a path of a core wire in a substantially inverted S shape or a substantially inverted δ shape of the second core wire accommodating portion, An extra-length storage tray for an optical fiber cable, which is formed by the fourth partition wall, the fifth partition wall, and the sixth partition wall. 3. The extra length storage tray of an optical fiber cable according to claim 2, wherein the first partition wall, the second partition wall, the third partition wall, the fourth partition wall, and the fourth partition wall. An extra length storage tray for optical fiber cables, wherein extra length retainers protrude from all or any of the five walls or the sixth partition wall.