JPH0125922Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an optical fiber surplus length storage body at a connecting portion of an optical fiber cable consisting of a plurality of optical fibers.

(Prior art) Conventionally, as an optical fiber extra length storage body for the connection part of multiple optical fibers of an optical fiber cable,
For example, the optical fiber connections and the extra length of the optical fibers pulled out one by one from the optical fiber cable are fixed with tape on the flat surface of a polyester fixing sheet, and a cover sheet with an adhesive layer on the periphery is placed on the sheet. It has been proposed to laminate and fix the fibers together, repeat this process sequentially over the remaining length of the optical fibers constituting the optical fiber cable, stack them, and store them in an optical fiber cable connection box (for example,
Publication No. 124804 of 1957).

However, in this case, when attaching the optical fiber connection portion or the extra length of the optical fiber to the polyester fixing sheet, it must be fixed with tape, which has the disadvantage of poor workability. In particular, when removing and reconnecting the corresponding extra length of optical fiber during inspection or in the event of an accident, separate the two adhesive sheets and place the optical fiber connection part and the excess optical fiber on the fixing sheet. Since the work of peeling off the tape fixing the long part is added, work efficiency is further reduced, and in some cases, lateral pressure may be applied to the extra length of the optical fiber during the work of peeling off the tape. There are drawbacks such as optical transmission characteristics changing from the values at the time of construction.

(Disclosure of the invention) The present invention has been developed in view of the above-mentioned difficulties, and is provided at the connection part of each optical fiber bundled in a ring in an optical fiber surplus length storage body for the connection part of an optical fiber cable consisting of a plurality of optical fibers. It has a holding part that can detachably hold the extra length of each bundle, and is made up of a plurality of bendable sheet-like spacers, a top plate, a bottom plate, and a back plate that connects them. The protective case has a front opening between the top plate and the bottom plate to prevent the stored sheet spacers from falling off. An optical fiber cable connection part characterized in that a pair of flanges are provided on the periphery of the part so as to protrude in opposite directions, and a pair of arms are provided on the edges of the back plate so as to close side openings, respectively. This paper proposes an optical fiber extra length storage body.

This will be explained below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of an optical fiber surplus length storage body for an optical fiber cable connection section according to the present invention. In Fig. 1, 1 is an optical fiber extra length storage body, 2 is a protective case, and 3, 3, ... are holding parts 3.
1, and in the case of this embodiment, they are sheet-shaped. 4 is an optical fiber having a connecting portion 41;

The protective case 2 is formed into a substantially U-shaped cross section, consisting of, for example, a top plate A, a bottom plate B, and a back plate C connecting the top plate A and the bottom plate B, and has a plurality of sheet-shaped spacers 3, 3, . . . It is designed to be able to detachably hold... In this example, in order to prevent the sheet-like spacers 3, 3, . . . from falling off, the flange 23, 23,
A pair of arms 24, 24 are provided on the end face of the back plate so as to close the side openings, respectively. These, the brim 23, 23, the arm 24,
24 may be provided as appropriate. Moreover, in order to prevent the sheet-like spacers 3, 3, .

FIG. 2 is a front view of the sheet-like spacer 3 in this embodiment, and FIG. 3 is a sectional view taken along the line AA in FIG. 2. 3 is a bendable sheet-like spacer made of paper, plastic, metal, etc.; 31;
is a holding part provided on the sheet-like spacer 3, for example, by fitting it in or fixing it with an adhesive, etc., and has a hook-shaped, claw-shaped, etc. It's getting old. Reference numeral 41 denotes a connecting portion of the optical fibers 4, which is protected by a reinforcing member or the like after splicing the optical fibers together.

Next, a method of using the optical fiber surplus length storage body of the present invention will be described.

First, when storing the extra length of the optical fiber connection part, bundle the extra length of the optical fibers one by one into a ring shape, and tie each bundle to the holding part 3 of the sheet-like spacer 3.
Using the elasticity of the extra length of the optical fiber, hang it inside the optical fiber and fix it. Since the optical fiber has an elastic force that tends to straighten it, it can be fixed without using a fixing member such as tape. Further, the connecting portion 41 may be housed in the holding portion 31 along with the remaining length of the optical fiber as appropriate.

The sheet-shaped spacer 3 containing the extra length of the optical fiber is set into the protective case 2 from the front opening by bending one sheet at a time or several sheets at a time. If grooves for fitting the sheet spacer are provided on the inner surface 21 of the bottom plate and the inner surface 22 of the top plate of the protective case 2, the sheet spacer can be prevented from falling by setting the grooves accordingly. can.

Next, when taking out the relevant optical fiber surplus length and reconnecting it during inspection or in the event of an accident, follow the procedure in reverse to the above case to form a sheet that retains the optical fiber surplus length at the failure point. The spacer can be removed from the protective case and the extra length of optical fiber can be removed from the sheet spacer. The extra length of the optical fiber is simply fixed on the holding part of the sheet-like spacer, so it is extremely easy to remove, and it can be quickly removed without adversely affecting the optical transmission characteristics, resulting in good workability. .

Next, other embodiments will be described.

Fig. 4 is a front view of a sheet-like spacer in another embodiment of the optical fiber surplus length storage body of the present invention, and Fig. 5 is a sectional view taken along line B-B in Fig. 4, and the same parts are designated by the same numbers. There is. Note that the above-mentioned example product can be used for the protective case.

In the case of this embodiment, the holding portion 31 is integrally molded with the sheet-like spacer 3, making it possible to omit the process of processing and fixing and integrating separate parts, and also to reduce costs. The working procedure for storing and taking out may be performed in the same manner as in the previous embodiment.

Although not shown, both upper and lower ends of the sheet-like spacer may be folded back in the same manner in the longitudinal direction, and the extra length of the optical fiber and the connecting portion may be stored therein. At this time, in order to stabilize the extra length of the optical fiber and the storage of the connecting portion, it is preferable to provide an appropriate radius in the folded portions provided at both ends.

As described in detail above, the optical fiber extra length storage body of the present invention has a structure in which the spacer that holds the extra length of the optical fiber is shaped like a sheet and can be easily folded. The spacer can be folded and pushed into the protective case 2 from the front opening, which is provided with a part for preventing the spacer from falling off, and the spacer is now completely stored in the protective case. If the spacer is a rigid body, it cannot be bent, so it is not possible to use a protective case with a part to prevent the spacer from falling off. Requires additional means (e.g. lacing).

As described above, the optical fiber extra length storage body according to the present invention is extremely easy to store the spacer in the protective case, and the number of parts can be reduced, so its practical value is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the optical fiber surplus length storage unit of the optical fiber cable connection part of the present invention;
The figure is a front view of a sheet-like spacer in the same embodiment, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is a front view of a sheet-like spacer in another embodiment.
FIG. 5 is a sectional view taken along line BB in FIG. 4. 1 is an optical fiber extra length storage body, 2 is a protective case,
3 and 3' are sheet spacers, 31 is a holding part,
4 and 4' are optical fibers, and 41 is a connecting portion.

Claims (1)

[Scope of utility model registration request] In an optical fiber surplus length storage body for the connection part of an optical fiber cable consisting of a plurality of optical fibers, a holding part is provided that can detachably hold the surplus length part of the connection part of each optical fiber bundled in an annular shape. have,
and a protective case that has a substantially U-shaped cross section and is composed of a plurality of bendable sheet-like spacers, a top plate, a bottom plate, and a back plate that connects these, and that can store the plurality of sheet-like spacers in a detachable manner. Therefore, in order to prevent the stored sheet-like spacer from falling off, the protective case has a pair of flanges protruding in opposite directions on the periphery of the front opening between the top plate and the bottom plate, and a back plate. 1. An optical fiber extra length storage body for an optical fiber cable connection part, characterized in that a pair of arms are provided on each end edge so as to close a side opening.