JPH09308065A - Boltless clamp for gripping electric wires - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To use one hand to hold a clamp body and an electric wire gripping portion formed by the clamp body without requiring a rotation operation of a tightening rod that pulls a clamp lid toward a clamp body by a compression repulsive force of a spring. Providing a boltless clamp for gripping electric wires that can be attached to electric wires. SOLUTION: A tightening rod hinged in the middle in a scissor manner on one side serves as an electric wire gripping portion at both open ends of a clamp body and a clamp lid, and on the other side, a tightening rod hinged to an extension arm of the clamp lid can be tilted to a base portion of the clamp body. The end of the spring, which was loosely inserted into the tightening rod with a nut, was rotatably abutted on a ridge-shaped ridge on the base of the clamp body. The push bolt screwed into the clamp body is pressed against the extension arm of the clamp lid to open the clamp lid and pre-compress the spring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boltless type clamp for gripping an electric wire and utilizing the compressive elastic force of a spring. This clamp is used for an electric wire grip portion of a boltless spacer of an overhead power transmission line.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example of a boltless type clamp in an electric wire gripping portion of a boltless spacer. A clamp body 2 that can be connected to a spacer shaft and one end of the clamp body has a hinge pin 7 attached to its own end. The electric wire 1 is sandwiched between the electric wire 1 and the clamp lid 3 which is hinged to the electric wire 1. The tightening rod 4 and the spring 5 are provided in order to pull the clamp lid 3 toward the clamp body 2 side and generate a gripping force to the electric wire 1. It is a thing. The tightening rod 4 is
It is inserted in the frame portion 21 of the clamp body in a T shape, and the spring 5 is a compression coil spring and is inserted into the tightening rod 4 in the frame portion 21, one end of which abuts against the inner surface of the frame portion 21, and the other. The end is locked to a washer or nut 10 at the end of the tightening rod 4, so that the T-shaped head 41 of the tightening rod is moved to the open end side of the clamp lid 3 by the elastic force generated by the compression of the spring 5. It is locked. When the T-shaped head 41 of the tightening rod is locked to the open end side of the clamp lid 3,
The clamp lid 3 is pulled toward the clamp body side by the axial force of the tightening rod 4, and thus the electric wire 1 is gripped by a predetermined tightening force.

By the way, in the boltless type clamp using the spring as described above, the compression margin of the spring 5 is made to have a margin, and the tightening rod 4 is pushed outward while pushing the spring 5 sufficiently (in FIG. 5, push up).
As a result, the head 41 of the tightening rod is lifted from the clamp lid 3, and when the tightening rod 4 is rotated by 90 ° at this point, the clamp lid 3 is released from the locked state of the head 41 of the tightening rod, and the hinge coupling portion. It becomes possible to expand using (7) as a fulcrum. By this expansion, it becomes possible to pinch the wire 1. Therefore, a preliminary compression work is required to compress the spring 5 before the electric wire is sandwiched.

A groove hole that opens in the lateral direction is formed on the open end side of the clamp lid 3, and the tightening rod 4 can be inserted into and taken out from the groove hole so that the clamp lid 3 is engaged with the clamp lid 3 sideways. It enables stopping and opening.

Conventionally, in order to perform the above pre-compression, the push bolt 6 as shown in FIG.
Then, the tip of the push bolt 6 is abutted against the end of the tightening rod 4, and the spring 5 is contracted by a certain length from that state so that the spring 5 is contracted by a certain amount.

[0006]

According to the above-mentioned prior art; the wireless boltless clamp shown in FIG. 5, one end of the clamp body 2 and one end of the clamp lid 3 are connected to the hinge pin 7.
Since it is a mechanism for hingedly coupling the lock pin 4 with a bolt having a T-shaped head 41 on the open end side which is the other end of the clamp lid, it is necessary to attach the wire to the electric wire. , The clamp lid 3 is once opened, the electric wire is passed through to a predetermined position, and then the clamp lid 3 is closed. While maintaining this, the tightening rod 4 is rotated by 90 ° so that the T-shaped head 41 is removed. It is necessary to work with both hands to open and close the clamp lid 3 and to engage and disengage the tightening rod 4 such that the clamp lid 3 is locked at the open end of the clamp lid 3. It is a heavy burden to do. Further, the work of locking the clamp lid 3 with the tightening rod 4 made of a T-shaped bolt is rotated by using a dedicated tool. However, the tool is disengaged from the tightening rod during rotation, or is rotated by the compression force of the spring 5. There is a problem that the tightening rod is difficult to rotate due to the large friction.

Therefore, the problems to be solved by the present invention (objects)
Can attach the wire clamp formed by the clamp body and the clamp body to the wire with one hand without the need to rotate the tightening rod that pulls the clamp lid toward the clamp body by the compression repulsion force of the spring. An object is to provide a boltless clamp for gripping an electric wire.

[0008]

DISCLOSURE OF THE INVENTION According to the boltless clamp for grasping an electric wire provided by the present invention, a clamp body and a clamp lid are hingedly joined together at a middle in a scissor manner, and the clamp body is opened at one side from the hinge jointed portion. An electric wire gripping portion is formed by the end and the open end of the clamp lid, and an arm is extended from the clamp lid on the other side from the hinge joint portion, and the extended arm and the base of the clamp body are pulled together via a tightening rod and a spring. The electric wire can be gripped by the lever principle.

In the above wireless boltless clamp, it is preferable that the clamp lid is opened and the spring is pre-compressed by pressing the push bolt screwed into the clamp body against the extension arm of the clamp lid.
The tightening rod has one end hinged to the extension arm of the clamp lid, and is loosely inserted into the base of the clamp body so that it can be tilted, and the one end of which is locked by a nut screwed into the tightening rod. It is preferable that the other end rotatably abuts on a ridge having a semi-circular shape having the other end at the base of the clamp body. Alternatively, hinge connection between the protruding end of the tightening rod that is movable in the axial direction of the clamp body and the extended arm of the clamp lid is performed by the elongated hole and the hinge pin that is slidable in the major axis direction of the elongated hole. It is also possible to

[0010]

1 to 4 show an embodiment of a boltless clamp for gripping an electric wire according to the present invention, which comprises a boltless clamp for a spacer for overhead power transmission lines. In the boltless clamp of this embodiment, as shown in FIG. 1, a clamp body 2'which can be connected to a spacer shaft and a clamp lid 3'are hingedly connected by a hinge pin 7'at an intermediate portion to form a scissors type. In the above, the open end 2'a of the clamp body and the open end 3'a of the clamp lid are formed in a shape suitable for gripping an electric wire; the wire gripping portion is formed in a substantially semicircular shape.

On the clamp lid 3 ', an extension arm 3'b is formed on the other side of the intermediate hinge joint portion (7') so as to correspond to the base portion 2'b of the clamp body. Then, extension arm 3 '
One end of a tightening rod 4'is hingedly connected to b by a hinge pin 7 ", and the tightening rod 4'is connected to the base 2'of the clamp body.
The hole 11 formed in b is inserted so as to be tiltable, and further, the inside of the clamp body base 2'b (in the drawing, the clamp body base 2 '
(lower space of b). In this extended portion, a spring 5'which is a compression coil spring is inserted, and a nut 10 is screwed to the lower end of the tightening rod 4 ', so that the spring 5'is linked to the nut 10 and the clamp body base 2'b. The amount of compression of the spring 5'can be set by adjusting the tightening of the nut 10.

At the spring contact portion of the base portion 2'b of the clamp body, as shown in FIG.
A ridge 9 having a semi-circular shape is provided, and the washer 9 is rotatably abutted on the arc-shaped surface of the ridge 9,
The end of the spring 5'is continuously connected to.

A push bolt 6 is screwed into the clamp body base 2'b, and the tip of the push bolt 6 is projected above the base 2'b so that the extension arm 3'b of the clamp lid can be pushed up.

According to the boltless clamp of this embodiment having the above structure, first, FIGS.
As shown in FIG. 5, the push bolt 6 is screwed and propelled to push up the extension arm 3'b of the clamp lid. Then, the clamp lid 3 '
Is rotated and opened as shown in the figure with the intermediate hinge joint (7 ') as a fulcrum. Along with this, extension arm 3'b
The tightening rod 4 ', which is hinged to, is pulled out and at the same time the spring 5'is pre-compressed. At this time, as shown in FIG. 4, the tightening rod 4 ′ is tilted about the center point P of the arc of the chamfered portion 9, but as long as there is no slip between the chamfered portion 9 and the washer 8. Draw a trajectory centered on the point P (the slip here is
Since the load is applied by the spring etc., slippage does not occur at all). Therefore, the tightening rod 4'is extended by the extension arm 3 '.
It can be tilted smoothly in association with b.

When the flange lid 3'is opened as described above, the electric wire 1 is put in the semicircular groove of the open end 2'a of the flange main body in the electric wire grip portion, and the push bolt 6 is loosened. And wire gripping is accomplished. That is, when the push bolt 6 is loosened, the compression repulsive force of the spring 5'which has been pre-compressed pulls the tightening rod 4'to the clamp body side, and in conjunction with this, the extension arm 3'b and the clamp body base 2 '. b, and then the clamp lid 2'is closed, and the open end 3'a holds the wire 1 while the open end 3'a and 3'a clamp and hold the wire 1. Will be done. 1 and 3 show the state after the electric wire is gripped.

According to the boltless clamp of this embodiment having the above-mentioned structure and functions, the wire gripping work can be performed with one hand while holding the spacer. Further, the individual parts of the wire gripping part are simple and the number of parts can be reduced as compared with the conventional product; Furthermore, the assembly is easy, and the assembly time is shortened; the cost is advantageous.

It should be noted that the above-described embodiments have been illustrated as preferable embodiments even if they are tired, and there may be variations within the scope of the technical idea of the present invention. For example, instead of the push bolt 6, a wedge-shaped one or a refill rod may be used. Further, in addition to inclining the tightening rod 4'by utilizing the chamfered portion 9, the tightening rod 4'is slidable only in its axial direction so that the extension arm 3'b of the clamp lid and the tightening rod 4'can be connected. It is also possible to make the hinge connection by using an elongated hole and a pin slidable in the major axis direction of the elongated hole.

[0018]

According to the present invention as described above,
Without the need to rotate the tightening rod that pulls the clamp lid toward the clamp body with the compression repulsion of the spring,
An intended problem to provide a boltless clamp for gripping an electric wire, in which the clamp main body and the electric wire gripping portion formed by the clamp main body can be attached to the electric wire with one hand (purpose)
Can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing a boltless clamp for gripping an electric wire in a state after gripping an electric wire and showing a partial cross-section according to an embodiment of the present invention.

FIG. 2 is a front view showing the boltless clamp according to the embodiment of FIG. 1 in a state immediately before gripping an electric wire and partially in section.

3 is an enlarged explanatory view of a main part of the boltless clamp in the state of FIG. 1. FIG.

FIG. 4 is an enlarged explanatory view of a main part of the boltless clamp in the state of FIG.

FIG. 5 is a front view showing a boltless clamp for gripping an electric wire as a conventional example in a state after gripping the electric wire.

[Explanation of symbols]

 1 wire 2'clamp body 2'a open end (wire grip) 2'b base 3'clamp lid 3'a open end (wire grip) 3'b extension arm 4'tightening rod 5'spring 6 push bolt 7 ′ Intermediate hinge pin for clamp 7 ″ Hinge pin for tightening rod 8 Washer 9 Chamfer 10 Nut

Claims (4)

[Claims] 1. A clamp body and a clamp lid are hingedly joined together at a middle in a scissor-like manner, and an electric wire gripping portion is formed by an open end of the clamp body and an open end of the clamp lid on one side from the hinge joint portion. A boltless clamp for gripping an electric wire, which is configured such that an arm is extended from a clamp lid on the other side from a hinge coupling portion, and the extended arm and a base portion of the clamp body are attracted via a tightening rod and a spring. 2. A boltless clamp for gripping an electric wire according to claim 1, wherein the clamp lid is opened and the spring is precompressed by pressing a push bolt screwed into the clamp body against an extension arm of the clamp lid. . 3. The tightening rod has one end hinged to an extension arm of the clamp lid, is tiltably inserted freely into the base of the clamp body, and has one end locked to a nut screwed into the tightening rod. The boltless clamp for electric wire gripping according to claim 1 or 2, wherein the other end of the spring is rotatably abutted on a semi-cylindrical ridge having the base of the clamp body. 4. A hinge connection between a protruding end of a tightening rod, which is movable in the axial direction of a rod, and an extended arm of a clamp lid in a clamp body, is provided with a long hole and a hinge pin which is slidable in a long diameter direction of the long hole. The boltless clamp for gripping an electric wire according to claim 1 or 2, wherein the boltless clamp is used.