JPH0144308Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in stress cone extraction tools useful for extracting stress cones forming prefabricated connections for power cables.

Generally, in a prefabricated connection section for power cables, for example, as shown in FIG. 5 is inserted.

By the way, in such a prefabricated connection part,
When detaching the cable terminal section 5 as necessary, the following difficulties arose.

That is, most of the cable end portion is housed within the insulating unit 1, and since the stress cone 4 itself is spindle-shaped, there is no place to grip it, making it difficult to pull it out.

In addition, if several years have passed since the termination part was formed, the lubricant such as grease dries up and the stress cone made of a rubber material becomes tightly attached to the insulating unit 1 or the cable insulator 3, so that it may become detached. The problem was that it required a large pulling force.

For this reason, conventionally, as shown in Japanese Utility Model Publication No. 53-53095, there has been a main body having a conical expansion surface and a contact surface that fits the following straight neck surface, and a pointed screw established in the conical portion has been used. A rubber stress cone extraction tool is used, which is provided so that it can move forward and backward with respect to the sloped part of the stress cone, and has a handle on the straight neck part. There was a drawback that this method could only be applied when the insulation unit 1 was present in the insertion opening of the insulation unit 1. That is, as shown in FIG. 2, when inserting the cable end portion 5 into an insulating unit 1' whose insertion opening 2' is deep in relation to the electrode, the pointed screw is moved forward and backward. Because of this, there was a problem in that it was impossible to pull out the stress cone.

The present invention has been made with attention to these points, and an object thereof is to provide a stress cone pulling tool that can easily pull out the stress cone even when the stress cone is completely housed in the insulating unit. It is.

Hereinafter, the present invention will be explained based on the drawings of one embodiment. In FIG. 3, for example, around one end of the cylindrical metal fitting main body 6 having a two-part structure, there is a rear end of a piece-shaped gripping body 8 whose tip part is bent inward to form a hooking part 7, for example. , screws 9, etc. This gripping body 8 is made of bronze, spring steel, etc.
A large number of these are equally distributed on the circumference approximately parallel to the axis.

A pipe-shaped handle 10 is welded to the outer periphery of the other end of the cylindrical body 6, for example, perpendicular to the axis.

Next, a method of using the extraction tool according to the present invention will be explained. As shown in Fig. 4, in which the same parts as in Figs. 8 is guided by the inclined surface 11 of the stress cone, and the gripping body expands outward. Then, due to the spring action of the gripping body, an inward force acts on the gripping body itself, and the hooking part 7 bites into the semiconductive rubber layer 12 that constitutes the stress cone 4, thereby causing the stress cone to Grip completely. Therefore, the handle 10 attached to the cylindrical main body 6
The stress cone can be pulled out by pulling it toward you while rotating it as necessary.

After the work is completed, the bolts 14 attached to the combination flange 13 are removed and the extraction tool is removed from the cable end.

As described above, in the present invention, since the gripping body having the hook part is attached to the outer periphery of one end of the cylindrical body, the stress cone can be easily removed even if the stress cone is completely housed inside the insulating unit. You can make withdrawals. Further, depending on the shape of the hooking part of the gripper or the design of its spring, a wide range of gripping force can be obtained, and furthermore, it is easier to handle than a conventionally constructed extraction tool.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic explanatory diagrams showing how the cable end is inserted into the insulation unit;
The figure is a front view of the stress cone extraction tool according to the present invention, and FIG. 4 is an explanatory view showing the usage situation of the product of the present invention. 6... Cylindrical main body, 7... Latching part, 8... Gripping body, 10... Handle.

Claims (1)

[Scope of utility model registration request] The rear end of each of the plurality of piece-shaped gripping bodies made of an elastic material and having a hook at the tip is arranged around one end of the split cylindrical body, and each hook protrudes from one end of the cylindrical body. 1. A stress cone extraction tool, which is attached substantially parallel to the axis of a cylindrical body, and has a handle formed at the other end.