JPH07143637A - Stress cone mounting implement - Google Patents

Abstract

PURPOSE:To facilitate mounting by mounting a hook and a wire at a pressing member having a conical recess in close contact with the tapered part of a stress cone to be mounted at the insulator of a cable and the through cable of the cable at its center, and towing the member by a winch, etc. CONSTITUTION:A recess conical part 11 in close contact with the tapered part 7D of a stress cone 7 is formed, and covered on its surface with soft plastic. The through hole 13 of the insulator 5 of a cable 1 is provided at the center of the part 11. Further, an annular pressing part 14 is integrally provided with the periphery of the hole 13, and three hooks 15 are mounted at an axial symmetry at equal intervals. After the part 11 is brought into contact with the part 7D of the cone 7, a wire 16 is engaged with the hook 15 of the part 14, and the part 14 is towed by a winch, etc., in the direction of an arrow 10. Thus, the damage of the cone is prevented to easily and effectively mount the cone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stress cone mounting tool which can comfortably mount a stress cone, which is mounted at the connection portion of a power cable for the purpose of electrical protection, on the outer circumference of a cable insulator.

[0002]

2. Description of the Related Art At a connecting portion or a terminal portion of a power cable, a stress cone is attached to an outer circumference of an insulator of the cable in order to reduce electric stress. FIG. 2 is a view for explaining such a stress cone, (a) is a vertical sectional view of the cable end and the stress cone, and (b) is a side view of the cable end equipped with the stress cone.

In the figure, a cable 1 has a sheath 2, a shield layer 3, a semiconductive layer 4 and an insulator 5 at its end.
Are sequentially peeled off to expose the conductor 6 for a predetermined length. Here, a stress cone 7 having a sectional structure as shown in the figure is mounted. The stress cone 7 has a semiconductive portion 7A and an insulating portion 7B. Normally, the stress cone 7 is formed by integrally molding rubber, and the arrow 10 in the state shown in FIG.
While applying force in the direction of (1), it is inserted and mounted until the state shown in FIG.

[0004]

By the way, in the conventional cable terminal assembling work as described above, there are the following problems to be solved. Stress cone 7 is cable 1
It must be fitted so as to be sufficiently closely attached to the insulator 5. Therefore, the through hole 7C of the stress cone 7 is finished to have an inner diameter slightly smaller than the outer diameter of the insulator 5,
The mounting work requires a great deal of force. Normal,
In order to facilitate this mounting work, silicone oil is applied to the outer circumference of the cable insulator 5 in advance. However,
However, it still requires a considerable amount of power and has the drawback of poor workability. Moreover, in this case, the taper portion 7D of the stress cone 7 is pushed, but this portion is then pressed against the insulator unit for insulating and protecting the connection portion with a constant pressure to closely adhere to obtain a necessary withstand voltage characteristic. It's an important part. Therefore, it is necessary to prevent scratches or adhere foreign matter to this portion as much as possible.

The present invention has been made in view of the above points, and an object thereof is to provide a stress cone mounting tool that facilitates mounting work of this type of stress cone.

[0006]

A stress cone mounting tool of the present invention is for pushing a stress cone mounted on the outer periphery of an insulator of a cable in the longitudinal direction of the cable, and is provided on a taper portion of the stress cone. A cone-shaped portion that closely contacts, a through hole that allows the cable to pass through at the center of the cone-shaped portion, and a pressing portion that applies a force that presses the cone-shaped portion in the taper portion direction of the stress cone, To do.

[0007]

When the stress cone is mounted on the outer circumference of the insulator of the cable, this tool brings the taper portion of the stress cone into close contact with the inner surface of the cone-shaped portion. The conductor of the cable is passed through the through hole. The pressing portion is pushed by hand as it is, or is pushed in the longitudinal direction of the cable by using a winch or the like with a hook and a wire. This makes it possible to attach the stress cone with a strong force without damaging it.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1A and 1B show an embodiment of a stress cone mounting tool of the present invention, FIG. 1A is a perspective view, and FIG. 1B is a vertical sectional view showing a usage state. First, as shown in FIG. 1 (a), the stress cone mounting tool of the present invention connects a tapered cone-shaped portion 11 and a tubular portion 12 and further a flange so as to surround the tubular portion 12. The pressing portion 14 having the shape of a circle is provided. In this embodiment, three hooks 15 are fixed to the pressing portion 14 at exactly equal intervals in an axially symmetrical manner.

The stress cone mounting tool of the present invention having the above structure is used as follows. When the stress cone 7 is attached to the insulator 5 of the cable 1 as shown in FIG.
It is necessary to apply a force in the direction shown in, that is, in the longitudinal direction of the cable. At this time, the stress cone mounting tool of the present invention is arranged so that the cone-shaped portion 11 is brought into close contact with the tapered portion 7D of the stress cone 7 as shown in this figure. A through hole 13 having an inner diameter slightly larger than that of the insulator 5 of the cable is provided at the center of the stress cone mounting tool.

Further, as described above, the hook 15 is fixed to the pressing portion 14 provided on the outer periphery of the through hole 13. A wire 16 is tied to the hook 15. In this state, connect the three wires 16 with the arrow 1
When pulled with a winch or the like in the direction of 0, a force in the direction of arrow 10 is applied to the entire surface of the stress cone 7 with a uniform force.

As a result, the work of mounting the stress cone 7 proceeds extremely smoothly, and the risk of scratching the taper portion 7D of the stress cone 7 or adhering foreign matter during such work is reduced. . In addition,
In order to prevent such a scratch on the tapered portion 7D,
The inner surface of the cone-shaped portion 11 is coated with polyethylene or other soft plastic. The stress cone mounting tool itself may be made of metal, but may be made of a plastic material that does not damage the stress cone 7.

The present invention is not limited to the above embodiments. In the above embodiment, the cone-shaped portion 11 and the tubular portion 12 are provided, and the pressing portion 14 is provided on the outer periphery thereof.
It does not matter if a flange is attached to an appropriate place of 1 and used as a pressing portion. Further, the pressing portion is not necessarily in the shape of a disc, but may be in the shape of a handle that can be held by a person.

The pressing force may be applied by a winch, human power, or other mechanism. Furthermore, in order to prevent the taper portion 7D from being scratched, a sheet or other material different from the stress cone mounting tool is used.
You may make it set to the taper part 7D at the time of pressing. Further, the cone-shaped portion 11 may have a shape such that at least the inner surface thereof comes into close contact with the taper portion of the stress cone, and the outer shape itself does not necessarily have to be a cone shape.

[0014]

As described above, the stress cone mounting tool of the present invention has a cone-shaped portion that is in close contact with the taper portion of the stress cone, a through hole that allows the cable to pass through at the center of the cone-shaped portion, and the cone-shaped portion is a stress cone. Since it has a pressing portion that applies a pressing force in the taper portion direction, it is possible to attach the stress cone to the cable insulator while applying a large uniform force to the entire stress cone. Therefore, not only the mounting work becomes easy, but also the taper portion of the stress cone is not subjected to an unreasonable force, so that there is no possibility of scratching or adhering foreign matter.

[Brief description of drawings]

FIG. 1 shows an embodiment of a stress cone mounting tool of the present invention, FIG. 1 (a) is a perspective view thereof, and FIG. 1 (b) is a cross-sectional view of a cable terminal and a tool showing a usage state thereof.

FIG. 2 is an explanatory view of a stress cone mounted on a conventional general cable terminal, (a) is a vertical sectional view of the cable terminal and the stress cone, and (b) is a side view when the stress cone is mounted on the cable terminal. Is.

[Explanation of symbols]

 1 Cable 5 Insulator 7 Stress Cone 7D Tapered Part 11 Cone Part 12 Cylindrical Part 13 Through Hole 14 Pressing Part

Claims (1)

[Claims] 1. A cone-shaped portion for pressing a stress cone mounted on the outer periphery of an insulator of a cable in a longitudinal direction of the cable, the cone-shaped portion being in close contact with a taper portion of the stress cone, and a center of the cone-shaped portion. And a through hole for penetrating the cable, and a pressing portion for applying a force for pressing the cone-shaped portion toward the taper portion of the stress cone.