JPH0125282B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cable sheathing dismantling tool used for stripping the sheathing of optical cables used particularly for optical communications.

[Background technology and its problems] Optical cables used as transmission lines for optical communications are
In order to protect the fragile optical fiber core made of quartz glass or the like, several coating layers are provided around the optical fiber core.

FIG. 1 is a sectional view showing an example of such an optical cable, in which 1 is an optical fiber core through which cable light etc. is transmitted, 2 is a protective layer that protects the aggregate of the optical fiber cores 1 (optical fiber unit), 3 is a tensile strength wire spirally wound around the outer periphery of the protective layer 2;
Reference numeral 4 denotes a metal coating layer made of copper, aluminum, etc., disposed around the outer periphery to fix the tensile strength wire 3 and protect the inside. Note that a sheath coated with polyethylene or the like is formed on the outside of the metal coating layer 4.

When connecting an optical cable with such a structure to a repeater or terminal equipment (transmitting/receiving equipment) as an optical communication path, or when inspecting optical transmission characteristics, it is a matter of course that the metal coating layer 4, tensile strength It is necessary to sequentially peel off the wire 3 and the protective layer 2 from the outside to expose the optical fiber 1 and connect the optical fiber 1 to a repeater, terminal device, measuring instrument, or the like.

Conventionally, such opening work was carried out by using an electric grindstone or the like to move the optical cable fixed to a fixed stand.
The metal coating layer 4 in the shaded area shown in the figure was shaved in the axial direction of the optical cable, the metal coating layer 4 was opened on both sides using pliers, etc., and the tensile strength wires 3, etc. were untwisted and unraveled to expose the optical fiber 1. .

When exposing the optical fiber core 1 as described above, if the optical cable is bent, it is difficult to cut the optical cable, and the work must be performed by multiple people, resulting in poor work efficiency. Also,
The grindstone wears out rapidly, increasing costs, generating dust and noise, and the high temperatures generated when cutting the metal coating layer 4 have a negative effect on the optical fiber core 1 due to the heat.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a cable sheathing dismantling tool that can perform the cable extraction work efficiently and without adversely affecting the core wire.

〔Example〕

FIG. 3 is a perspective view showing a cable sheathing dismantling tool according to an embodiment of the present invention, in which 5 is a cylinder made of metal, etc., and 6 is a cylinder 5 that shrinks as it advances in the axial direction from one end of the cylinder 5. The closing V-shaped slits 7A and 7B are handles provided in the radial direction of the cylinder 5 at both ends of the cylinder 5, and one handle 7A can be attached and detached by screwing it into the cylinder 5. It is preferable.

When an optical cable is to be opened using the cable sheath dismantling tool of the present invention constructed as described above, first, cut a part of the metal sheath layer 4 of the optical cable shown in FIG. One of the tensile strength wires 3 is pulled out, and the tip of the tensile strength wire 3 is inserted into the slit 6 and locked as shown in FIG. 4a. After that, when the handle 7A is grasped with both hands and rotated along the twisting direction of the tensile strength wire 3 so as to wrap the tensile strength wire 3 around the cylinder 5, the tensile strength wire 3 is wound around the cylinder 5 as shown in FIG. The metallization layer 4 can be torn apart. At this time, each handle 7
You can also hold both A and 7B with your left and right hands and rotate them.

Then, when the metal coating layer 4 has been cut to a desired length, the handle 7A is removed from the cylinder 5 and the wrapped tensile force line 3 is moved in the direction in which the slit 6 expands with respect to the cylinder 5. The distal end is unlocked and can be removed from the cylinder 5. Thereafter, the torn metal coating layer 4 can be peeled off using pliers or the like in the same manner as in the prior art, and the optical fiber core 1 can be exposed.

The cable sheath dismantling tool of the present invention has a V-shaped slit 6, so it can be used for tensile strength wires 3 of various wire diameters, and since the tensile strength wire 3 is bitten by the slit 6, when the cylinder 5 is rotated, the tensile strength wire 3 can be The wire 3 can be made difficult to separate. Further, the tensile strength wire 3 can be easily removed.

In addition, in the above embodiment, the handles 7 at both ends of the cylinder 5 are
Although handles A and 7B are provided, only one handle 7A or 7B may be provided. It goes without saying that the present invention can be applied not only to optical cables but also to general cables whose tensile strength wires are piano wires or the like.

〔Effect of the invention〕

By using the cable sheath dismantling tool of the present invention, the cable opening work can be easily performed as described above, so even one person can perform the opening work easily and efficiently, and the cable removal work can be carried out easily and efficiently without dust, noise, etc. Since work can be carried out in sanitary conditions without the generation of heat, work efficiency is improved and there is no need for heat to have an adverse effect on the core wires of the cable. In addition, there are advantages such as no consumables and no expenses required for the intervening work.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an example of an optical cable, Figure 2 is a sectional view showing an example of an optical cable.
Figures a and b are explanatory diagrams of conventional opening work, Figure 3 is a perspective view showing a cable sheath dismantling tool according to an embodiment of the present invention, and Figures 4 a and b are cable sheath dismantlement tools of the present invention. FIG. In the figure, 1 is an optical fiber core, 2 is a protective layer, 3 is a tensile strength wire, 4 is a metal coating layer, 5 is a cylinder, 6 is a slit, and 7A and 7B are handles.

Claims (1)

[Claims] 1. A V-shaped slit is formed that contracts and closes from one end of the cylinder in the longitudinal direction and is capable of holding at least the cable tensile strength wire, and a V-shaped slit is formed at one end or both ends of the cylinder. A cable sheathing dismantling tool characterized by having a handle extending in the radial direction.