JPH11326647A - Excessive-length housing metal fitting for optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture and field work by making even one kind of metal fittings adaptive to loops differing in diameter. SOLUTION: Paired two excessive-length housing metal fittings for an '8'-shaped loop support an excessive-length part of an optical fiber cable fixedly in an 8-shaped loop on a support wire and consist of a cross-shaped main body 1 and a suspender 2 supporting the main body 1 on the support wire (M). Then one longitudinal arm 3 and both lateral arms 5 among four longitudinal and lateral arms of the main body 1 are enabled to expand and contract and be fixed freely, a hold part 9 for an optical fiber cable (F) is provided to the tips of those arms 3 and 5, and a loop having a different diameter is formed and fixed through the expansion and contraction of those arms 3 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extra length storage metal fitting for attaching an extra length of an optical fiber cable which is laid in the air into a figure-eight loop and attaching it to a support wire.

[0002]

2. Description of the Related Art When an optical fiber cable is laid in the air via a power pole or the like, it is provided along an imaginary supporting line and is suspended from the supporting line.

[0003] In such an optical fiber cable, the situation of the overhead wire changes due to the rebuilding of a power pole or the like, and the length of the optical fiber cable may need to be adjusted. In addition, the length of the overhead wire is set in advance so as to allow a margin, and the extra length is adapted to the variation in the length of the overhead wire.

[0004] The extra length is usually collected in a loop and suspended on a support wire or other support means.

As shown in FIG. 6, if the extra length of the optical fiber cable F is collected into one round loop, the load of the loop is applied to a narrow range. There is too much strength to support only.

For this reason, such a loop must be formed in the vicinity of a telephone pole and supported by a support arm provided on the telephone pole. Is troublesome.

The extra loop provided near the telephone pole occupies a considerable amount of space, which hinders the work on the telephone pole.

Therefore, in the prior art, as shown in FIG. 7, a surplus storage metal fitting is provided in which the surplus length of the optical fiber cable is put into a figure-eight loop and this is supported by a support line M. (For example, US Patent 509)
2663).

[0009] The extra length storage metal fittings are attached to the two arc portions of the figure-eight loop in pairs.
As shown in FIG. 8, a racket-shaped main body 21 and a suspender 22 for suspending the main body 21 with respect to the support line M are provided.

If this extra length storage metal fitting is used, the extra length of the optical fiber cable F is collected into a figure-eight loop extending long in the direction of the overhead wire, so that the load of the extra length is reduced by the supporting wire M. And the support line M can be supported without difficulty.

When an extra length loop is provided in the vicinity of the utility pole, the respective arc portions of the figure-eight loop may be positioned on both sides of the utility pole. There is an advantage that the straight line portion intersects with the utility pole and hardly obstructs the work of the utility pole.

[0012]

By the way, it is desirable that the loops for the extra length of the optical fiber cable be formed as small as possible from the viewpoint of the relationship with other overhead lines and the necessity of adjusting the appearance. However, in order to prevent the predetermined characteristics of the optical fiber cable from deteriorating, it is not necessary to bend the fiber cable to a small diameter, but the bending radius is naturally limited according to the number and the outer diameter of the cords. . Generally, the bending radius of an optical fiber cable needs to be 10 times or more the outer diameter of the cable.

As described above, the size of the loop to be formed by the extra length differs according to the outer diameter of the cable and the like. Therefore, in the extra length storage fitting having the configuration shown in FIG. Accordingly, various types of main bodies 21 having different diameters must be prepared, which not only increases the cost, but also requires that various types having different diameters be brought to the site, which imposes a heavy burden on the operator.

The present invention has been made in view of the above-mentioned conventional problems, so that even if the outer diameter of the optical fiber cable is different and the diameter of the loop to be formed by the extra length is different, it is possible to cope with a single kind of cable. An object of the present invention is to unify the types of extra-length storage metal fittings required and facilitate manufacturing and on-site work.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a spare length storage unit for fixing a surplus length of an optical fiber cable to a figure-eight loop and supporting the same on a support line in pairs. In the metal fitting, a vertical arm and a horizontal arm are formed of a main body projecting in a cross shape, and a suspending tool for suspending the main body with respect to a support line. At least one of the vertical arm and the horizontal arm of the four vertical and horizontal arms of the main body and Both of the horizontal arms can be freely extended and retracted and fixed, and a holding portion for the optical fiber cable is provided at the tip of each of the three arms.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an entire extra length storage fitting according to an embodiment of the present invention, FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line-in FIG. 2, and FIG.
5 is an enlarged cross-sectional view taken along the line-in FIG.

The extra length storage fitting of this embodiment corresponds to the half of the figure-eight loop of the optical fiber cable, like the conventional extra length storage fitting, and has a cross-shaped main body 1 and
And a suspender 2 for suspending the main body 1 with respect to the support wire.

The main body 1 includes a pair of upper and lower vertical arms 3 and 4 made of, for example, a round pipe made of stainless steel or aluminum.
In addition, a pair of left and right horizontal arms 5 and 5 are connected in a cross shape, and a reinforcing portion 6 is provided at the center of the cross shape.

Of the four arms 3, 4, 5, and 5,
One of the vertical arm 3 and the two horizontal arms 5, 5 has a double pipe structure, and the outer pipe 3 having one end connected to the reinforcing portion 6.
b, 5b, 5b, and inner tubes 3a, 5a, 5a inserted into the other ends of the outer tubes 3b, 5b, 5b.
By sliding a and 5a, the length of protrusion is changed by expansion and contraction. Hereinafter, these three arms 3, 5, and 5 are referred to as telescopic arms.

The outer tube 3 of the telescopic arms 3, 5, 5
At the tips of b, 5b, 5b, inner tubes 3a, 5a, 5a, respectively
To fix the inner tube 3a, 5
A fixture 7 such as a bolt penetrating through a, 5a is provided. Also, the inner tubes 3a, 5 of the telescopic arms 3, 5, 5
Marks 8 indicating the protruding length are provided on the surfaces of a and 5a.

Furthermore, the inner tube 3 of the telescopic arms 3, 5, 5
a, 5a, 5a, an optical fiber cable F
Is attached.

The holding part 9 partially holds the optical fiber cable F substantially at right angles to the telescopic arms 3, 5, and 5. The holding parts 9,. Has the same structure.

FIG. 3 exemplifies the holding portion 9 of one of the lateral arms 5. As shown in the figure, the holding portion 9 is formed of a U-shaped or upward U-shaped plate piece having a side surface shape, and has a slot 10 through which a fastening band passes through a tip piece and a bottom piece. The optical fiber cable F is fixed in the holding portion 9 by the fastening band B made of stainless steel.

Of the vertical and horizontal arms 3, 4, 5, and 5 of the main body 1, the other vertical arm 4, which is not a telescopic arm, is extended longer than the telescopic arms 3, 5, and 5;
As shown in FIG. 4, the parallel holding portions 1 for fixing and holding the optical fiber cables F along the vertical arms 4 respectively.
1 is provided.

The tip of the parallel holding portion 11 also has a slot 12 for passing a fastening band, and the optical fiber cable F is fixed in the parallel holding portion 11 by the fastening band B.

On the other hand, the hanging member 2 is usually attached to each of the vertical arms 3 and 4 sandwiching the reinforcing portion 6 of the main body 1. As shown in FIG. 5, the hanging member 2 has a substantially U-shaped side surface. Of the vertical arms 3 and 4 are provided at the lower part of the plate body 13 and the clamp 15 of the support wire M is provided at the upper part thereof. The main line portion of the fiber cable F passes through.

The extra length storage metal fitting having the above-described configuration is provided with two extra portions for the figure eight loop to be formed by the extra length of the optical fiber cable F.
Used in sets. In one, the half of the figure-8 loop is fixed and this is supported by the support line.

More specifically, as shown in FIG. 2, while bending the extra length of the optical fiber cable F, the optical fiber cable F is attached to the holding portions 9 at the distal ends of the telescopic arms 3, 5, 5 of the main body 1. And the subsequent portion is passed through and held by the parallel holding portion 11 at the tip of the long vertical arm 4.

As a result, the extra length of the optical fiber cable F is formed into an arc shape around the three telescopic arms 3, 5, and 5 and narrowed and narrowed parallel at the tip of the long vertical arm 4. ,
The whole is fixed to the main body 1 in a racket shape.

The main body 1 has two hanging members 2 in the longitudinal direction.
By attaching the hanging member 2 to the support line M, the main body 1 is suspended, and the extra length of the optical fiber cable F is collected in a racket shape and supported by the support line M. Become.

The main line extending from the extra length of the optical fiber cable F to the left and right passes through the space inside the upper and lower U-shapes of the plate 13 of the hanging member 2 and is drawn out.
(See FIG. 7).

In an optical fiber cable F having different outer diameters,
The size of the loop to be formed differs depending on the extra length.
The protrusion length of 5 may be changed.

If the protruding length of each of the three telescopic arms 3, 5, 5 is shortened by one step, the extra length of the optical fiber cable F is held by the holding portion 9 on the inner diameter side by one step. Therefore, a small-diameter loop is formed. Conversely,
If the telescopic arms 3, 5, 5 are protruded one step longer, the extra length of the optical fiber cable F is held at the one step outer diameter side,
Form a large diameter loop. Thus, a single-length storage metal fitting can handle both a large-diameter loop and a small-diameter loop.

In the above embodiment, the telescopic arms 3, 5, 5 and 5 of the vertical and horizontal arms 3, 4, 5 and 5 of the main body 1 are used.
However, one of the vertical arms 4 is elongated, and a parallel holding portion 11 is provided at the end thereof. However, such a parallel holding portion is omitted, and the optical fiber cables F are bundled directly at the tip of the vertical arm 4 and directly. The support line M may be supported.

[0035]

According to the present invention, a loop of an optical fiber cable is formed and fixed by three arms which can be freely extended and retracted, and the diameter of the loop is changed by changing the protruding length of the telescopic arm. Can be changed arbitrarily.

Therefore, even a single kind of extra-length storage metal fitting can cope with loops having different diameters, and it is not necessary to prepare various extra-length storage metal fittings having different diameters as in the conventional case.
A single type may be manufactured.

For this reason, the production is easy and the cost can be reduced. Further, since it is not necessary to bring various kinds of extra-length metal fittings to the site, the burden on the operator is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the entire extra length storage fitting according to an embodiment of the present invention.

FIG. 2 is a plan view of the extra length storage metal fitting.

FIG. 3 is an enlarged cross-sectional view taken along a line − in FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along a line − in FIG. 2;

FIG. 5 is an enlarged cross-sectional view taken along line-of FIG.

FIG. 6 is an explanatory diagram of an aerial wire of the optical fiber cable.

FIG. 7 is an explanatory diagram of a figure-8 loop due to an extra length of an optical fiber cable.

FIG. 8 is an exploded perspective view of a conventional extra length storage metal fitting for a figure eight loop.

[Explanation of symbols]

1 body, 2 hanging equipment, 3
Vertical arm (Telescopic arm), 4 Vertical arm, 5
Side arm (telescopic arm), 9 holding part, F optical fiber cable, M support wire,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuharu Sakai 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Inside Kansai Electric Power Company (72) Inventor Tetsuji Osugi 3-chome, Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 22 Kansai Electric Power Co., Inc.

Claims (1)

[Claims] An extra length storage bracket for fixing an extra length of an optical fiber cable to a figure-eight loop and supporting it on a support line, wherein a vertical arm and a horizontal arm protrude in a cross shape. A main body, and a suspending device for suspending the main body with respect to a support line. At least one of the vertical arm and the horizontal arm among the four vertical and horizontal arms of the main body is freely expandable and contractable, and An extra length storage bracket for an optical fiber cable, wherein a holding portion for the optical fiber cable is provided at a tip of each of the three arms.