JPS6246162Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to coupling between an optical submarine repeater and an optical submarine cable, and particularly relates to a forming structure of a tail cable.

The tail cable of an optical submarine cable must be accommodated in the repeater enclosure with a certain amount of extra length to accommodate buffering when external forces are applied. It was formed into a coil shape with the same layer diameter. Figure 1
shows a conventional example of this type. FIG. 2 is a schematic diagram of the connection between an optical submarine cable and a repeater enclosure. In FIG. 1, 1 is an optical submarine cable, 2 is a cable retainer, 3 is a cable coupling, 4 is a gimbal,
5 is a tail cable, 6 is a feedthrough, 7 is an end plate, and 8 is a repeater enclosure. The tail cable 5 receives seawater pressure as external pressure, but the gimbal 4
When the tail cable 5 is bent, the tail cable 5 also moves, and if this is repeated, the tail cable 5 will gradually become flattened, its water pressure strength will decrease, and it is conceivable that it will eventually break. In particular, when each turn of the coil has the same diameter, when the gimbal 4 bends, adjacent turns of the coil come into contact with each other, increasing the bending rigidity of the coil, which causes bending stress to concentrate on the tail cable 5 near the gimbal 4. The tail cable 5 in this part is easily damaged. From the above, it is necessary for the tail cable 5 to have a flexible structure that bends when the gimbal universal joint 5 moves.

In addition, the conventional structure requires a large space to accommodate the tail cable 5, and the length between the gimbal pins of the cable coupling rings 3 attached to both sides of the optical submarine repeater enclosure 8 increases, resulting in a space factor. There are also disadvantages that are undesirable.

The present invention solves the above-mentioned drawbacks of the conventional technology, and even when bending stress is applied to the gimbal, adjacent turns of the coiled tail cable move without contacting each other, thereby reducing the stress from the leader wire. A tail cable structure in an optical submarine cable coupling capable of absorption is provided.

In order to achieve this objective, the present invention gradually increases the diameter of each turn of the tail cable formed in a coil shape, and the coils are arranged along almost the same plane, so that
At least one of the lead wires to the repeater side (i.e., the feedthrough) is eccentric from the center of the coil so that they are not located on the same straight line passing through the cable stop and the center of the feedthrough in the vicinity of the plane of this coil. It is located.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 shows an embodiment of the present invention, in which 4a
The gimbal pin 5a is the tail cable, and l
is the length between the gimbal pins. FIG. 3 is a front view including a cross section taken along line A-A' in FIG. By forming in this way, the coil 5a is wound in almost the same plane, and the diameter of each turn of the coil gradually increases, so even if the gimbal 4 moves, adjacent turns do not overlap with each other. The leader lines a and b do not come into contact with each other either. That is, even if the gimbal 4 moves, bending stress will not be concentrated on a part of the coil, and the durability of the tail cable 5a against repeated bending will be greatly improved, and the water pressure resistance will also be significantly increased.

Furthermore, since the tail cable 5a is formed in the same plane, the space for accommodating the tail cable 5a in the axial direction of the repeater housing is reduced, and the length l between the gimbal pins of the repeater housing 8 is reduced.
The space factor can also be significantly shortened and the space factor improved.

The lead wires a and b may be eccentric from the center of the coil 5a on one side or on both sides. This prevents the lead lines a and b from coming into contact with each other even if an external force is applied that would slightly narrow the distance between the lead lines a and b.

As described above, according to the present invention, by forming the tail cable by gradually changing the diameter of each turn within the same plane, the tail cable can be formed even if it is repeatedly bent due to the movement of the gimbal universal joint. It is possible to provide a tail cable forming structure that does not deteriorate the mechanical properties of the tail cable and is also good in terms of space factor.

[Brief explanation of the drawing]

FIG. 1 is a side view including a vertical cross section schematically showing the connection structure of a conventional optical submarine repeater case and cable coupling, FIG. 2 is a vertical cross section showing an embodiment of the present invention, and FIG. FIG. 3 is a front view showing the main parts. 1... Optical submarine cable, 2... Cable retainer, 3... Cable coupling, 4... Gimbal, 4a... Gimbal pin, 5, 5a... Tail cable, 6... Feedsle, 7... End plate ,
8...Relay body, l...Length between gimbal pins.

Claims (1)

[Scope of utility model registration request] The tail cable is formed into a coil shape in which the diameter of each turn gradually increases along approximately the same plane, and at least one of the respective lead wires to the cable side and the repeater side is near the surface of the coil. A tail cable structure in an optical submarine cable coupling arranged eccentrically from the center of the coil.