JPH0746728A - Clamp for extension of line - Google Patents

Abstract

PURPOSE:To provide a clamp for extending an electric wire without a possibility of a suddenly folded, bent, damaged or broken electric wire. CONSTITUTION:A clamp 1 for extending an electric wire is formed with a sleeve 2 for inserting, compressing and fixing an electric wire 11 to be extended and a tubular protection cover 3 covering the sleeve 2 and extending to the wire insertion side of sleeve 2. The protection cover 3 comprises a main body 5, a bellows 6 and an elastic cylinder 7. The body 5 is covered with the sleeve 2 and the bellows 6 is made of a plurality of rings 9 mutually linked to permit bending at a constant curvature. The elastic cylinder 7 has wire net 10 embedded internally to give rigidity for restricting the bending throughout a certain range at the side of bellows 6. An extreme folding or bending of the electric wire 11 can be prohibited by the bellows 6 and the elastic cylinder 7 of the protection cover 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, when extending an electric wire,
The present invention relates to a wire extension clamp used by connecting to an end of an electric wire.

[0002]

2. Description of the Related Art A wire drawing clamp has a clevis for connecting a pulling wire rope or the like at one end side thereof,
A sleeve for inserting, compressing and fixing an electric wire extending to the other end side is provided. As this kind of wire drawing clamp, for example, one disclosed in Japanese Utility Model Publication No. 57-1526 is known. This wire-drawing clamp includes a sleeve having a clevis and a tubular bush made of an elastic material that is connected to the end of the sleeve on the wire insertion side and extends toward the wire. The tubular bush covers the electric wire to prevent its sharp bending, and prevents the electric wire from being damaged by being bent near the end of the wire drawing clamp.

[0003]

Even the tubular bush in the above-described conventional wire clamp cannot sufficiently resist the bending stress of the electric wire when passing through the gold wheel, and the boundary between the sleeve and the bush is bent. There is a problem that it causes the wire to break.

[0004] Therefore, an object of the present invention is to provide a wire-drawing clamp in which bending of the electric wire does not occur in the vicinity of the connection portion and there is no fear of disconnection.

[0005]

In the present invention, in order to solve the above-mentioned problems, a sleeve 2 for inserting and compressing and fixing a wire 11 to be extended, and a sleeve 2 fixed to the sleeve 2 and on the wire insertion side of the sleeve 2. In the wire clamp 1 including the cylindrical protective cover 3 made of an elastic material, the protective cover 3 includes a main body 5, a bellows body 6, and an elastic cylindrical body 7. The main body 5 covers the sleeve 2, the bellows body 6 is configured by mutually engaging a plurality of rings 9 that can be curved with a constant curvature, and the elastic tubular body 7 includes the wire net 1 inside.
0 was embedded, and rigidity was given to suppress bending over a certain range on the side of the bellows body 6.

[0006]

In the wire drawing clamp 1 of the present invention, the end portion of the electric wire 11 is inserted into the sleeve 2 and compression-fixed, and the protective cover 3 is put on the sleeve 2 for use. Clevis 4 on one end of sleeve 2
The wire rope 21 for towing is connected to the wire, and the electric wire 11 is extended by passing over the gold wheel suspended on the steel tower. When the wire drawing clamp 1 passes through the gold wheel, the bellows body 6 first limits the bending of the electric wire 11 from the tip side of the electric wire 11, and then,
On the bellows body 6 side of the elastic tubular body 7, the bending of the electric wire 11 is limited by the internal wire net 10, so that the wire net 1
In the portion where there is no 0, the electric wire 11 is allowed to bend relatively freely. Therefore, the electric wire 11 is prevented from being sharply bent in the vicinity of the connecting portion between the electric wire 11 and the wire drawing clamp 1, and the electric wire 11 is prevented from being damaged.

[0007]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view in which a part of the wire drawing clamp is cut away,
FIG. 2 is a partial sectional view.

In the figure, 11 is an electric wire and 21 is an electric wire 11.
Is a wire rope for pulling the wire rope, and 1 is a wire-drawing clamp interposed therebetween.

The wire extension clamp 1 includes a sleeve 2 into which the electric wire 11 is inserted and compressed and fixed, and a cylindrical protective cover 3 made of an elastic material and extending toward the electric wire insertion side of the sleeve 2. On the tip side of the sleeve 2, the wire rope 21
The clevis 4 for connecting to is attached.

The protective cover 3 includes a main body 5, a bellows body 6,
It is composed of an elastic cylinder 7 and is made of an elastic synthetic resin such as urethane. The main body 5 has a tubular shape, covers the sleeve 2, and is fixed to the sleeve 2 with a screw 8 at a tip portion thereof. An annular groove 5a for engaging the bellows body 6 is formed on the outer periphery of the other end of the main body 5. Bellows body 6
Is configured by mutually engaging a plurality of rings 9 so as to be curved with a constant curvature. The ring 9 has an annular protrusion 9a for engagement on the inner circumference on one end side and an annular groove 9b for engagement on the outer circumference on the other end side. The annular protrusion 9a is fitted in the annular grooves 5a and 9b of the main body 5 or another ring 9. Annular groove 5
Since a and 9b are slightly wider than the annular protrusion 9a, the annular protrusion 9a can move within the annular grooves 5a and 9b. Therefore,
The rings 9 can be bent to each other within a range in which the annular protrusion 9a can move within the annular grooves 5a and 9b. The elastic tubular body 7 has a connection ring 7a at one end side, and the wire net 10 is embedded inside the connection ring 7a to the vicinity of the intermediate portion. Therefore, the elastic cylinder 7
Is the wire net 1 over a certain range on the side of the bellows body 6.
By 0, rigidity is given to suppress the bending. The connecting ring 7a is flexibly engaged with the annular groove 9b of the ring 9 by the annular projection 7b on the inner circumference. The portion of the elastic tubular body 7 where the wire net 10 is not present can be relatively flexibly curved together with the electric wire.

The wire drawing clamp 1 of this embodiment is composed of an electric wire 1.
It is used by fixing it to the end of 1. Clamp 1 for wire drawing and electric wire 1
At the time of connection work with 1, the protective cover 3 is previously fitted into the electric wire 11. The aluminum stranded wire on the outer periphery of the tip of the electric wire 11 is stripped off, inserted into the sleeve 2 and fixed by compression. When the compression fixing is completed, the protective cover 3 on the electric wire 11 that has been attached in advance is moved to above the sleeve 2, and the protective cover 3 is moved onto the sleeve 2.
Then, it is fixed to the sleeve 2 with the screw 8. Then, the pulling wire rope 21 is connected to the clevis 4 on one end side of the sleeve 3, and the electric wire 11 is extended by passing over the gold wheel suspended on the steel tower. When the wire-drawing clamp 1 passes through the gold wheel, the bellows body 6 is first used to move the electric wire 1 from the tip side of the electric wire 11.
A curvature of 1 is limited to a constant curvature. Next, on the bellows body 6 side of the elastic tubular body 7, the bending of the electric wire 11 is limited by the internal wire net 10, and subsequently, the wire net 1
In the portion where there is no 0, the electric wire 11 is allowed to bend relatively freely. Therefore, the electric wire 11 is prevented from being sharply bent in the vicinity of the connecting portion between the electric wire 11 and the wire drawing clamp 1, and the electric wire 11 is prevented from being damaged.

[0012]

As described above, according to the present invention, the sleeve 2 for inserting and compressing the extending electric wire 11 and the elastic material fixed to the sleeve 2 and extending to the electric wire inserting side of the sleeve 2 are used. In the wire drawing clamp 1 including the cylindrical protective cover 3 having the structure
And the bellows body 6 and the elastic cylinder body 7. The main body 5 is
The bellows body 6 covering the sleeve 2 is formed by mutually engaging a plurality of rings 9 so that the bellows body 6 can be bent with a constant curvature.
Has a wire net 10 embedded therein and is provided with rigidity so as to suppress the bending over a certain range on the side of the bellows body 6, so that the electric wire 11 does not bend around the connection portion and there is no risk of disconnection. Clamps can be provided.

[Brief description of drawings]

FIG. 1 is a front view in which a part of a wire drawing clamp is cut away.

FIG. 2 is a partial cross-sectional view of a wire drawing clamp.

[Explanation of symbols]

 1 Wire Extension Clamp 2 Sleeve 3 Protective Cover 4 Clevis 5 Main Body 6 Bellows Body 7 Elastic Cylindrical Body 10 Wire Net 11 Electric Wire 21 Towing Wire Rope

Claims (1)

[Claims] 1. A sleeve for inserting and compressing and fixing an electric wire to be extended, and a tubular shape made of an elastic material fixed to the sleeve so as to cover at least a part of the sleeve and extending to the electric wire insertion side of the sleeve. The protective cover includes a main body that covers a sleeve, a bellows body formed by mutually engaging a plurality of rings that can be curved with a constant curvature, and a wire net embedded inside the bellows body. A wire-drawing clamp, comprising: an elastic cylinder body having rigidity to suppress bending over a certain range.