JPH0237216Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a fixing device for a so-called optical fiber composite cable that combines an optical fiber and a conductor, and is particularly concerned with reducing optical transmission loss due to deformation of the optical fiber. This invention relates to an improvement in a fixation device that can prevent the increase in the number of cases.

[Prior art]

Figures 1 and 2 show a conventional elevator cable fixing device. In the figures, 1 is a car, 2 is a guide rail that guides the elevator car 1, and 3 is an elevator cable holding device. , 4
is a patch plate, 5 is a mounting arm for attaching the patch plate 4 to the guide rail 2, 6 is an elevator cable, 7 is its copper conductor, 8 is a protrusion provided on the patch plate 4, and 9 is a mounting arm for attaching the patch plate 4 to the guide rail 2. This is a bolt for fastening the elevator cable holding fitting 3 to the backing plate 4.

The elevator cable 6 is inserted between the backing plate 4 and the elevator cable holding fitting 3, and is clamped in a bent state by tightening the bolt 9. The weight of the elevator cable 6 is maintained by the frictional force.

By the way, it is expected that in the near future, a so-called optical fiber composite cable constructed by combining an optical fiber and an electric conductor will be used in the elevator cable 6 as well.

However, in the conventional fixing device, the elevator cable 6 placed between the backing plate 4 and the holding metal fitting 3
Because it is bent and supported by pressure,
There is a risk that the optical fiber may be deformed by bending or compressive force, resulting in an increase in optical transmission loss.

[Summary of the idea]

This invention was devised for the purpose of eliminating such drawbacks, and the block containing the optical fiber of the cable and the block containing the conductor are separated at least at the position of the pressure welding fitting, and only the block containing the conductor is connected to the pressure welding fitting. The present invention proposes a fixing device for an optical fiber composite cable in which the optical fiber is supported by the fibers so that the optical fibers are not deformed due to bending or compressive force.

[Example of idea]

FIG. 3 shows an embodiment of this invention, and the same reference numerals as in FIG. 2 indicate the same or corresponding parts. 10 is an optical fiber that constitutes an optical fiber composite cable 6 for an elevator together with a copper conductor 7;
Reference numeral 11 denotes an optical fiber 1 separated from the block containing the copper conductor 7 of the cable 6 at a position below the holding fitting 3.
This is a fixing fitting for fixing the block containing the copper conductor 7 at a position above the holding fitting 3 again along the block containing the copper conductor 7.

However, in this embodiment, in the optical fiber composite cable 6, the optical fiber 10 and the copper conductor 7 are molded into separate blocks, and the block containing the optical fiber 10 is molded into the copper conductor 7 slightly below the holding fitting 3.
is separated from the containing block. and copper conductor 7
The block including the block is clamped and fixed in a bent state between the backing plate 4 and the presser fitting 3. On the other hand, this copper conductor 7
As shown in FIG. 3, the block containing the optical fiber 10 separated from the block containing the optical fiber 10 is bent with a curvature greater than the permissible bending radius, and placed through the side of the holding metal fitting 3, and then placed over the copper conductor again at a position above the holding metal fitting 3. It is attached to a block including 7 and fixed by a fixture 11. As a result, the optical fiber 10 is not subjected to compressive force and is not bent excessively, so there is no possibility that optical transmission loss will increase.

Incidentally, in this case, the weight of the cable 6 is supported only by the block containing the copper conductor 7, but the block containing the optical fiber 10 is lighter than the block containing the copper conductor 7, and the weight of the cable 6 is supported by the block containing the copper conductor 7. If the length is less than the allowable load determined from the strength of the copper conductor 7, the copper conductor 7 or the optical fiber 1
There is no possibility that 0 will break.

In the above embodiment, a case has been described in which the blocks containing the optical fiber 10 are located on both sides of the cable 6, but if the block containing the optical fiber 10 is passed through the upper surface side of the holding fitting 3,
The same can be applied to the case where the cable 6 is located at the center of the cable 6. Moreover, it can be applied not only to elevator cables but also to various optical fiber composite cables.

[Effect of idea]

As described above, this invention separates the block containing the optical fiber and the block containing the conductor at least at the position of the pressure welding fitting to bypass the pressure welding fitting, and connects only the block containing the conductor to the pressure welding fitting. I decided to support it with
It is possible to effectively prevent an increase in optical transmission loss of the optical fiber due to pressure welding, and since the optical fiber can support its own weight by the conductor in which it is connected, it has the effect of suppressing an increase in transmission loss even during the process. .

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing a conventional elevator cable fixing device, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is an example of an optical fiber composite cable fixing device according to this invention. This is a diagram equivalent to Figure 2. 3: Holder metal fitting, 4: Backing plate, 6: Cable,
7: Copper conductor, 10: Optical fiber, 11: Fixing metal fittings. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a cable in which an optical fiber and a conductor are combined and configured to be supported by a pressure welding fitting, the block containing the optical fiber and the block containing the conductor of the cable are separated at least at the position of the pressure welding fitting. A fixing device for an optical fiber composite cable, characterized in that the pressure fitting is bypassed and only the block containing the conductor is supported by the pressure fitting.