JPH09163564A - Clamp for cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp by which the work of mounting a clamp for cable on a cable can be performed in a short time. SOLUTION: A fastening rod 23 which has pierced a clamp body 13 to catch a cable and a clamp cap 15 is made elastically by providing an elastic part 23B in axial direction of that fastening rod 23. If the fastening rod is elongated, a cable can be caught loosely with the clamp body and the clamp cap, while if the fastening rod is contracted, the cable can be caught firmly with the clamp body and the clamp cap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire clamp in which a clamp body for holding an electric wire and a clamp cap are tightened by using a tightening rod penetrating them.

[0002]

2. Description of the Related Art In general, a spacer, a twist prevention damper, an interphase spacer, and the like are attached to an overhead electric wire (an overhead transmission line, an overhead ground wire, etc.) by an electric wire clamp. There are various types of electric wire clamps. Among them, there is an electric wire clamp configured to clamp a clamp main body and a clamp cap by using a tightening rod that penetrates them.

An example of such a wire clamp will be described with reference to FIGS. That is, the electric wire clamp includes the clamp body 13 for holding the electric wire 11 and the clamp cap 15. This clamp body 1
As shown in FIG. 5, the clamp cap 15 and the clamp cap 3 are openably and closably coupled to each other on one side of the wire gripping grooves 17 and 19 by a hinge portion 20, and on the other side, a tightening rod 23, a coil spring 25,
It is adapted to be tightened by a tightening mechanism 21 composed of an eccentric cam 27 and the like.

The tightening rod 23 of the tightening mechanism 21 penetrates through the clamp body 13 and has a T-shaped engaging portion 29 (see FIGS. 6 and 7) which engages with the open end side of the clamp cap 15 at one end thereof. The eccentric cam 27 is rotatably attached to the other end by a shaft pin 31. Further, the coil spring 25, together with the washer 33, has the eccentric cam 27 and the clamp main body 13 with the tightening rod 23 inserted therein.
It is located between.

On the open end side of the clamp cap 15, the T-shaped engaging portion 29 of the tightening rod 23 is provided with a notch (or a long hole) 35 through which the T-shaped engaging portion 29 of the tightening rod 23 can pass when it is oriented in a direction perpendicular to the electric wire, and is directed in a direction parallel to the electric wire 11. A stopper wall 37 is formed so as to be hooked with. That is, the clamp cap 15
The T-shaped engaging portion 29 of the tightening rod 23 can be opened and closed by directing the T-shaped engaging portion 29 in a direction perpendicular to the electric wire 11. When the tightening rod 23 is rotated 90 ° in a closed state, the T-shaped engaging portion 29 is attached to the stopper wall 37. They are caught and do not rotate any further.

The eccentric cam 27 rotates about the shaft pin 31 to compress the coil spring 25 as shown in FIG. 6 and the state in which the coil spring 25 is not compressed as shown in FIG. The eccentric cam 27 is U as shown in FIG.
The bent portion has a hole 41 for turning operation.

Next, a procedure for gripping an electric wire with the electric wire clamp will be described. First, the eccentric cam 27 is kept in a state where the coil spring 25 is not compressed as shown in FIG. 7, the tightening rod 23 is rotated, the T-shaped engaging portion 29 is directed in the same direction as the elongated hole 35, and the clamp cap 15 is opened. Next, the electric wire 11 is inserted between the clamp body 13 and the clamp cap 15, and the clamp cap 15 is closed.
Rotate it by 0 ° to move the T-shaped engaging portion 29 to the clamp cap 1
5 is engaged.

Next, as shown in FIG. 7, the hole 4 of the eccentric cam 27 is formed.
Insert the operating rod 43 into 1 and rotate 180 ° in the direction of arrow P. Then, as shown in FIGS. 5 and 6, the eccentric cam 2
Since 7 compresses the coil spring 25, the clamp body 13 and the clamp cap 15 are clamped by the repulsive force, and the electric wire 11 is firmly gripped.

The above-mentioned operation of tightening the clamp body and the clamp cap to firmly grip the electric wire 11 is performed by a person riding on a floating device suspended on the electric wire and moving on the electric wire, moving on the electric wire, and Is stopped by operating the eccentric cam at that position.

However, there is a problem that the workability is poor because the work for attaching the electric wire clamp is an operation on an unstable electric wire. Also, the number of electric wire clamps to be attached to one transmission line is very large, and in particular, for spacers used in multi-conductor transmission lines with 4 conductors or more, one spacer has 4 or more electric wire clamps, which is the same as the number of transmission lines. Therefore, there is a problem that it takes a lot of time for the mounting work.

Therefore, first, near the steel tower, the electric wire is loosely gripped by the clamp body and the clamp cap, and then the clamp body and the clamp cap are slid on the electric wire to move to a predetermined position, and finally the coil spring is compressed. There has been proposed a method for attaching an electric wire clamp in which the clamp body and the clamp cap are fixed to an electric wire by utilizing the repulsive force of the coil spring by setting the state.

According to such a wire clamp mounting method, the work of loosely gripping the wire between the clamp body and the clamp cap can be performed near the steel tower where the wire does not easily shake, so that the work is performed in a short time. Further, after the clamp body and the clamp cap are slid on the electric wire and moved to a predetermined position, only the operation of putting the coil spring into a compressed state is performed, and therefore the work can be performed in a short time. There is an advantage.

[0013]

However, when the above-mentioned work is attempted by using the conventional wire clamp, the conventional wire clamp has a structure in which the eccentric cam attached to the tightening rod is rotated to compress the coil spring. Therefore, there is a problem that it is difficult to loosely grip the electric wire between the clamp body and the clamp cap near the steel tower. That is, when the eccentric cam is rotated, the coil spring is compressed, and accordingly, the clamp body and the clamp cap firmly grip the electric wire, and it is difficult to grip the electric wire loosely. On the other hand, if the eccentric cam is not rotated in order to hold the wire loosely, the T-shaped engaging part of the tightening rod will come off the clamp cap, and therefore the wire can be slid and moved to a predetermined position. The problem arises that it becomes difficult.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a wire clamp in which a wire can be easily gripped loosely by a clamp body and a clamp cap.

The electric wire clamp according to the present invention is an electric wire clamp in which a clamp body for gripping an electric wire and a clamp cap are tightened by using a tightening rod penetrating the clamp body and the clamp rod. It is characterized in that its length is adjustable in the axial direction.

When a tightening rod penetrating the clamp body for gripping the electric wire and the clamp cap is formed so that the length of the tightening rod can be adjusted in the axial direction of the tightening rod, when the tightening rod is extended, the clamp body and the clamp cap are separated. The electric wire can be loosely gripped, and when the tightening rod is contracted, the electric wire can be firmly gripped by the clamp body and the clamp cap.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 3 show an embodiment of a wire clamp according to the present invention. The same parts as those in FIGS. 4 to 7 are designated by the same reference numerals and the description thereof will be omitted.

In the electric wire clamp according to the present invention, the tightening rod 23 is formed so that its length can be adjusted in the axial direction. That is, as shown in FIG. 3, the tightening rod 23 has a T-shaped engaging portion 29 on one end side and an expandable portion 23B on the other end side. The expansion / contraction part 23B includes a bolt hole 23C provided in the axial direction of the tightening rod body 23A, and a bolt part 23D screwed into the bolt hole 23C. Therefore, the length of the tightening rod 23 can be changed by screwing the bolt portion 23D into the bolt hole 23C and changing the screwing length. The length of expansion and contraction of the tightening rod 23 is such that the electric wire can be loosely gripped by the clamp body and the clamp cap in the extended state, and the electric wire can be firmly gripped by the clamp body and the clamp cap in the contracted state. The length should be selected.

Next, a method of attaching to the electric wire with the electric wire clamp using the tightening rod 23 having the above-mentioned structure will be described. First, perform the following work near the steel tower. First rod 2
3 is extended, the T-shaped engaging portion 29 of the tightening rod 23 is directed in the same direction as the elongated hole 35, and the clamp cap 15 is opened. Next, the electric wire 11 is inserted between the clamp body 13 and the clamp cap 15, the clamp cap 15 is closed, and then the tightening rod 23 is rotated 90 ° to engage the T-shaped engaging portion 29 with the clamp cap 15. In this state, the clamp body 13 and the clamp cap 15 loosely grip the electric wire 11. Clamp body 1
3 and the gap between the clamp cap 15 and the outer diameter of the electric wire 11 is preferably 3 mm or more.

Next, the clamp body 13 and the clamp cap 15 are moved on the electric wire 11 to be positioned at predetermined positions. This work can be easily carried out by a person on the airborne vehicle by moving a spacer or the like. In order to prevent the electric wire 11 from being scratched when the clamp body 13 and the clamp cap 15 are moved on the electric wire 11,
Electric wire 11, clamp body 13, and clamp cap 1
It is preferable to interpose a cylindrical protective body made of hard plastic or the like between the protective member and the protective member 5.

Clamp body 13 and clamp cap 15
After the and are moved on the electric wire 11 and positioned at a predetermined position, the bolt portion 23D of the tightening rod 23 is tightened (see FIG. 2). As a result, the coil spring 25 can be held in a compressed state. When the coil spring 25 is in a compressed state, the compression repulsive force causes the clamp body 13 and the clamp cap 15 to firmly grip the electric wire 11, and the clamp body 13 and the clamp cap 15 cannot move on the electric wire 11.

In the electric wire clamp according to the present invention, the coil spring may not be provided and the clamp body may be directly clamped by the clamp rod. Further, the shape of the expansion / contraction portion of the tightening rod is not limited to the screw shape, and may be any shape whose length can be adjusted.

[0023]

As described above, the electric wire clamp according to the present invention uses the tightening rod whose length is adjustable in the axial direction. Therefore, when the tightening rod is extended, the clamp body and the clamp body are clamped. The electric wire can be loosely gripped by the cap, and the electric wire can be firmly gripped by the clamp body and the clamp cap when the tightening rod is contracted. Therefore, since the electric wire can be loosely gripped by the clamp body and the clamp cap near the steel tower, the attaching work can be easily performed in a short time.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a wire clamp according to the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a front view showing an embodiment of a tightening rod.

FIG. 4 is a plan view of a conventional wire clamp.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a sectional view taken along line AA of FIG. 5;

7 is a cross-sectional view showing a non-compressed state of the coil spring shown in FIG.

[Explanation of symbols]

 11 wire 13 clamp body 15 clamp cap 17, 19 wire grip groove 20 hinge part 21 tightening mechanism 23 tightening rod 23B expandable part 25 coil spring 27 eccentric cam 29 T-type engaging part

Front page continuation (72) Inventor Tomoyuki Watanabe 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. A wire clamp comprising a clamp body for holding an electric wire and a clamp cap, which are tightened by using a tightening rod penetrating the clamp body, the length of the tightening rod being adjusted in the axial direction of the tightening rod. Electric wire clamp characterized by being freely formed.