JPH1042438A - Clamp for electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp for electric wire which can firmly clamp an electric wire with its main body and cap after the main body and cap are loosely put on the electric wire near a steel tower and slid on the electric wire to a prescribed position. SOLUTION: In a clamp for electric wire which is composed of a clamp main body 13 and a clamp cap 15 which are tightly clamped by utilizing a clamping rod 23 and an elastic body 25, a clamp cap locking piece 23B which is reduced in diameter to pass the cap 15 when the cap 15 is passed through the piece 23B and, after the cap 15 has passed through the piece 23B, it is diameter to prevent the coming off of the cap 15 is provided on the rod 23.

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 and an elastic body.

[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 tighten the clamp body and the clamp cap by utilizing the compression repulsive force of an elastic body.

An example of such an electric wire clamp is shown in FIG.
This will be described with reference to FIG. That is, the electric wire clamp includes the clamp body 13 for holding the electric wire 11 and the clamp cap 15. As shown in FIG. 11, the clamp body 13 and the clamp cap 15 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 include a tightening rod 23, a coil spring 25, and an eccentric cam 27 on the other side. Tightening mechanism 21
Is tightened.

A tightening rod 23 of the tightening mechanism 21 penetrates through the clamp body 13 and has a T-shaped engaging portion 29 (FIG. 1) at one end of which engages with the open end of the clamp cap 15.
2, see FIG. 13), and the eccentric cam 27 is rotatably attached to the other end by a shaft pin 31. In addition, the eccentric cam 27 and the clamp body 1 are provided together with the washer 33 and the tightening rod 23 in the coil spring 25.
3 are arranged.

On the open end side of the clamp cap 15, a notch (including a long hole) 35 through which a T-shaped engaging portion 29 of the tightening rod 23 can pass when oriented in a direction perpendicular to the electric wire, and in a direction parallel to the electric wire 11. A stopper wall 37 is formed to be hooked when facing. 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.

Further, the eccentric cam 27 rotates around the shaft pin 31 and can take a state of compressing the coil spring 25 as shown in FIG. 12 and a state of not compressing the coil spring 25 as shown in FIG. The eccentric cam 27 has a U-shape as shown in FIG.
Are formed.

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. 13, and the clamping rod 23 is rotated so that the T-shaped engaging portion 29 is oriented 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,
After closing the clamp cap 15, the tightening rod 23 is rotated by 90 ° to engage the T-shaped engaging portion 29 with the clamp cap 15.

Next, as shown in FIG. 13, the operating rod 43 is inserted into the hole 41 of the eccentric cam 27, and rotated 180 ° in the direction of arrow P. Then, as shown in FIGS. 11 and 12, the eccentric cam 27 compresses the coil spring 25, and the repulsive force causes the clamp body 13 and the clamp cap 15 to be tightened, so that 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.

[0010]

However, there is a problem that the work of attaching the electric wire clamp is poor because the work is performed on an unstable electric wire. Also, the number of wire clamps to be attached to one transmission line is very large.
Since one spacer has four or more electric wire clamps equal to the number of power transmission lines, there is a problem that much time is required for mounting work.

In view of the above, first, a clamp body and a clamp cap are attached near a steel tower so as to surround the outer periphery of the electric wire and leave a gap between the outer periphery of the electric wire and the clamp body and the clamp cap are then moved to a predetermined position on the outer periphery of the electric wire. Has been proposed, and finally, the clamp body and the clamp cap firmly grip the wire with the clamp body.

According to such a method of mounting the electric wire clamp, the operation of mounting the clamp body and the clamp cap by surrounding the outer periphery of the electric wire and opening a gap between the outer periphery of the electric wire and the outer periphery of the electric wire is difficult in the vicinity of the tower where the electric wire is hard to swing. Can be carried out in a short time, and after the clamp body and the clamp cap are moved to a predetermined position on the outer periphery of the wire, the wire is firmly gripped by the clamp body and the clamp cap. Since it is only necessary to perform the operation to perform the operation, there is an advantage that the operation can be performed in a short time.

However, if the above-mentioned operation is performed using a conventional wire clamp, the conventional wire clamp has a structure in which an eccentric cam attached to a tightening rod is rotated to compress a coil spring. There is a problem that it is difficult to attach the clamp body and the clamp cap by enclosing the wire and leaving a gap between the outer periphery of the wire and the outer periphery of the wire. That is, when the eccentric cam is rotated, the coil spring is compressed, whereby the clamp body and the clamp cap firmly grip the electric wire, surround the outer periphery of the electric wire, and make a gap between the outer periphery of the electric wire and the clamp. It becomes difficult to attach the main body and the clamp cap. On the other hand, even if the eccentric cam is not rotated, the gap between the clamp body and the clamp cap and the outer periphery of the wire is reduced, and therefore, the clamp body and the clamp cap are moved over the wire to a predetermined position. It becomes difficult to transport to the position.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been proposed in the prior art. Leave a gap between the outer circumference and the clamp body and clamp cap, then move the clamp body and clamp cap to a predetermined position on the outer circumference of the wire, and finally tighten the wire firmly with the clamp body and clamp cap. An object of the present invention is to provide an electric wire clamp capable of easily performing an attaching method of an electric wire clamp to be gripped, the structure of which uses a tightening rod and an elastic body to clamp a clamp body and a clamp cap to grip an electric wire. In the clamp for electric wires to be tightened, the diameter of the tightening rod is initially expanded, and the diameter is reduced when the clamp cap passes. Passed through a clamping cap and is characterized in that a clamping cap locking piece for locking the clamping cap to prevent omission clamp cap again expanded to after the clamping cap has passed.

As described above, the diameter of the tightening rod is initially enlarged, the diameter is reduced when the clamp cap passes, and the diameter is increased again after the clamp cap passes. By providing the clamp cap locking piece for locking the clamp cap so that the clamp cap does not come off, the clamp body and the clamp cap can be attached by surrounding the outer periphery of the electric wire and leaving a gap between the outer periphery of the electric wire and the clamp body. At the same time, the electric wire can be firmly gripped by the clamp body and the clamp cap.

That is, by positioning the clamp cap on the clamp cap retaining piece, the clamp cap retaining piece is slightly reduced in diameter, but the clamp cap retaining piece is cut into the clamp cap in order to maintain the enlarged diameter state. Press the surface. Thereby, the clamp cap is positioned on the clamp cap locking piece without coming off from the clamp cap locking piece. The state in which the clamp cap is located on the clamp cap locking piece is a state in which the clamp body and the clamp cap are attached so as to surround the outer periphery of the electric wire and leave a gap between the outer periphery of the electric wire and the clamp body. Next, when firmly holding the electric wire between the clamp body and the clamp cap, the clamp cap may be further pushed in. As a result, after the clamp cap passes, the diameter of the clamp cap locking piece increases again, and the increased diameter of the clamp cap locking piece locks the clamp cap. Accordingly, a compression repulsive force is generated in the elastic body, so that 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. FIGS. 1 to 3 show an embodiment of a tightening rod 23 used in the present invention. The tightening rod 23 is composed of a main body 23A and a clamp cap engaging piece 23B.

As shown in FIGS. 2A and 2B, the main body portion 23A has a columnar through portion 23A1 penetrating the clamp body and a U-shaped mounting portion 23A2 formed integrally with the lower portion of the through portion 23A1. It is composed of

On the other hand, the clamp cap locking piece 23B
As shown in FIGS. 3 (a) and 3 (b), it is composed of a pair of movable pieces 23B1 whose bases are overlapped, and a spring 23B2 which acts to always open the distal ends of the pair of movable pieces 23B1. A clamp cap 1 is attached to the pair of movable pieces 23B1.
5 is provided with a temporary fixing portion 23B3 for stopping on the way.

As shown in FIGS. 1A and 1B, the main body 23A and the clamp cap engaging piece 23B formed as described above are connected to the inside of the U-shape of the mounting portion 23A2 of the main body 23A. Move the stop piece 23B to its movable piece 23B.
1 are arranged so that the tip side is always open, and both are
To form the tightening rod 23.

As described above, the clamp cap locking piece 23
4 and 5, the tightening rod 23 provided with the clamp body 1 has a through portion 23A1 of the main body portion 23A.
3 and attached to the clamp body 13 side.

A penetrating portion 23A penetrating the clamp body 13
An eccentric cam 27 is rotatably attached to the distal end side of the eccentric cam 1 by a shaft pin 31. A coil spring 25 and a washer are provided between the eccentric cam 27 and the clamp body 13 in a state where the through portion 23A1 is penetrated. 33 are arranged.

FIGS. 4 and 5 show the clamp body 1.
3 shows a state in which the electric wire 11 is firmly gripped by the clamp cap 15 and the coil spring 25 is in a compressed state, and the clamp cap 15 is locked by a clamp cap locking piece 23B in an expanded diameter state. Have been. In FIGS. 4 and 5, the same parts as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

Next, a method for attaching the electric wire clamp having the above-described structure to the electric wire will be described. First, at the time of factory shipment or near a steel tower, as shown in FIG.
The operation rod 43 is inserted into the device and rotated 180 ° in the direction of arrow P. Then, the coil spring 25 is compressed between the clamp body 13 and the washer 41. In this state, the clamp cap locking piece 23B of the tightening rod 23
Is in an expanded state.

Next, the clamp body 13 and the clamp cap 15 are positioned so as to surround the electric wire 11 near the steel tower.
The clamp cap 15 is rotated to close. Then, as shown in FIG. 7, the notch 35 formed on the open end side of the clamp cap 15 is
The outer surface of 3B is slid, and the clamp cap locking piece 23B is reduced in diameter accordingly. As shown in FIG. 7, the rotation of the clamp cap 15 is stopped when the cut surface 35 is locked to the temporary fixing portion 23B3 of the clamp cap locking piece 23B. In this state, the clamp cap engaging piece 23B is slightly reduced in diameter, and the clamp cap engaging piece 23B in the reduced diameter state presses the cut 35 surface of the clamp cap 15 to maintain the initial enlarged state. ing. Thus, the clamp cap locking piece 2
Since the cut 35 surface of the clamp cap 15 is locked to the temporary fixing portion 23B3 of 3B, and the clamp cap locking piece 23B presses the cut 35 surface of the clamp cap 15, the clamp cap 15 locks the clamp cap. It will be located on the clamp cap locking piece 23B without falling off from the piece 23B. The state where the clamp cap 15 is located on the clamp cap locking piece 23B is a state where the clamp body and the clamp cap surround the outer periphery of the electric wire and a gap is provided between the outer periphery of the electric wire and the clamp body.

After the above operation is completed, the clamp body 13 and the clamp cap 15 which surround the outer periphery of the electric wire and have a gap between the outer periphery of the electric wire and the clamp body 15 are connected to the electric wire 11.
Is moved in the longitudinal direction of the outer periphery of the device and positioned at a predetermined position.
This operation can be easily performed by a person riding a spacecraft moving the clamp body 13 and the clamp cap 15.

When the clamp body 13 and the clamp cap 15 are moved in the longitudinal direction of the outer periphery of the electric wire 11,
In order to prevent the wire 11 from being damaged, the wire 11 is clamped between the clamp body 13 and the clamp cap 15.
It is preferable to interpose a cylindrical protective body made of a hard plastic or the like. When the clamp body 13 and the clamp cap 15 are mounted with a gap between the outer periphery of the electric wire and the clamp body 15, the gap is desirably 3 mm or more. When the gap is 3 mm or more, the operation of moving the clamp body 13 and the clamp cap 15 in the longitudinal direction of the outer periphery of the electric wire 11 can be easily performed.

Clamp body 13 and clamp cap 15
After having been positioned at a predetermined position in the longitudinal direction of the outer periphery of the electric wire 11, the clamp cap 15 is further pushed in and rotated as shown in FIG. Then clamp cap 15
The notch 35 surface is disengaged from the temporary fixing portion 23B3 of the clamp cap retaining piece 23B and moves upward, whereby the clamp cap retaining piece 23B returns to the initial expanded state. The clamp cap locking piece 23B in the expanded state locks the clamp cap so that the clamp cap 15 does not come off. In this state, a compression repulsion is generated in the coil spring 25, and the wire 11 is firmly gripped by the clamp body 13 and the clamp cap 15 using the compression repulsion.

The clamp cap 15 is rotated so that the clamp body 13 and the clamp cap 15
The operation of firmly gripping may be performed manually, or a compression jig 80 as shown in FIG. 9 may be used.
The compression jig 80 includes a U-shaped frame 81, a compression portion 82 disposed in the U-shaped frame 81 and engaged with the lower wall of the clamp cap 15, and vertically moving the compression portion 82. And a hydraulic cylinder 83 to be operated. This compression jig 80
In order to rotate the clamp cap 15 by using the eccentric cam 27, the upper part of the U-shaped frame 81 is engaged with the eccentric cam 27, and the hydraulic cylinder 83 is operated to move the compression portion 82 to the clamp cap 1.
5 may be engaged with the lower wall and the clamp cap 15 may be pushed in. Note that an electric motor, a hydraulic motor, or the like may be used instead of the hydraulic cylinder.

The electric wire clamp according to the present invention may use a rubber-like elastic body or a disc spring-like elastic body instead of the coil spring. Further, in the embodiment, the eccentric cam is used, but the eccentric cam may not be used, and a stopper for the elastic body for preventing the elastic body from coming off may be provided at the position of the eccentric cam. Further, the clamp cap locking piece used in the present invention is not limited to the embodiment, and for example,
It may be a member having a U-shaped spring property. Further, the clamp cap locking piece is not provided with a temporary fixing portion, and the clamp cap is temporarily fixed on the clamp cap locking piece by utilizing only the force of pressing the cut surface of the clamp cap. It may be.

[0031]

As described above, the electric wire clamp according to the present invention is 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 and an elastic body. Initially, the diameter is enlarged, and when the clamp cap passes, the diameter is reduced and passed through the clamp cap, and after the clamp cap passes, the diameter is increased again so that the clamp cap does not come off. Because it is characterized by providing a clamp cap locking piece to lock,
A clamp for an electric wire is provided that surrounds the outer periphery of the electric wire and allows a gap between the outer periphery of the electric wire and the clamp body and the clamp cap to be attached, and that the electric wire can be firmly gripped by the clamp body and the clamp cap. be able to. Therefore, in the vicinity of the tower, the clamp body and the clamp cap are attached by surrounding the electric wire outer periphery and leaving a gap between the electric wire outer periphery and then moving the clamp main body and the clamp cap to a predetermined position on the electric wire outer periphery,
Finally, a method of attaching a wire clamp that firmly grips the wire with the clamp body and the clamp cap can be easily implemented.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a tightening rod used in the present invention, wherein (a) is a front view and (b) is a side view.

FIGS. 2A and 2B show a main body constituting a tightening rod used in the present invention, wherein FIG. 2A is a front view, and FIG.

FIGS. 3A and 3B show a clamp cap locking piece constituting a tightening rod used in the present invention. FIG.
(B) is a side view.

FIG. 4 is a plan view showing an embodiment of an electric wire clamp according to the present invention.

FIG. 5 is a side view of the electric wire clamp shown in FIG. 4;

FIG. 6 is an essential part cross-sectional view before rotating a clamp cap.

FIG. 7 is an essential part cross-sectional view showing a state where the clamp cap is rotated to be positioned on the clamp cap engaging piece.

FIG. 8 is a cross-sectional view of a main part in a state where the clamp cap is rotated and locked on a clamp cap locking piece.

FIG. 9 is an explanatory view of a compression jig.

FIG. 10 is a plan view of a conventional wire clamp.

FIG. 11 is a side view of the electric wire clamp shown in FIG. 10;

FIG. 12 is a sectional view of a main part after the eccentric cam is rotated.

FIG. 13 is a sectional view of a main part before the eccentric cam is rotated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electric wire 13 Clamp main body 15 Clamp cap 17, 19 Electric wire gripping groove 20 Hinge part 21 Tightening mechanism 23 Tightening rod 23A Body part 23B Clamp cap locking piece 25 Coil spring 27 Eccentric cam 80 Compression jig

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoyuki Watanabe 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Ryuharu Sannobu 2-6-1 Marunouchi, Chiyoda-ku, Tokyo No. 1 Inside Furukawa Electric Co., Ltd. (72) Inventor Jun Kato 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. An electric wire clamp comprising a clamp body for clamping an electric wire and a clamp cap which is tightened by using a tightening rod and an elastic body. When the clamp cap is passed, the diameter is reduced and passed through the clamp cap, and after the clamp cap passes, the diameter is increased again and a clamp cap locking piece is provided to lock the clamp cap so that the clamp cap does not come off. And clamps for electric wires.