JPH08237837A - Cable clamp - Google Patents

Abstract

PURPOSE: To prevent a failure to fasten an eccentric cam by forming the eccentric cam into a separate unit from a tightening rod, and mounting the cam in the tightening rod in the case of placing a coil spring in a forced pressed condition. CONSTITUTION: In an eccentric cam 23, an almost U-shaped shaft pin mounting groove 23d is formed, to provide a shape like a hook. The eccentric cam 23, by hooking the pin mounting groove 23d to a shaft pin 24 fixed to a tightening rod 17, is formed so as to be mounted in the shaft pin 24. In the eccentric cam 23, a large diametric part 23a in a large distance and a small diametric part 23b in a small distance from the shaft pin 24 are provided with a 180 deg. space in a peripheral direction, to provide a hole 23 for the cam rotated. The shaft pin 24, in a condition that it is orthogonal to a lengthwise direction of the tightening rod 17, is mounted therein, to provide a disk guide plate 24a in both ends. The shaft pin 24 is mounted in the shaft pin mounting groove 23d, to insert an operating bar 26 into a hole 23c rotated. In this way, from a number of clamps and from a number of eccentric cams, a failure to tighten is surely prevented.

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 used for overhead wire spacers and dampers.

[0002]

[Prior Art] An electric wire clamp in which an overhead wire is gripped by a clamp body and a clamp cap and tightened with bolts and nuts, the bolts and nuts loosen due to vibration during use, and the clamp cap opens and falls off the overhead wire. May occur.

As an improved version of this, FIGS.
An electric wire clamp as shown in Fig. 1 is well known (Shokaisho 60-
31123 publication). The electric wire clamp 11 includes a clamp body 12 and a clamp cap 13, which are openably and closably coupled to each other by a hinge portion 16 on one side of the electric wire grip grooves 14 and 15.

On the other side of the wire grip grooves 14 and 15, the clamp body 12 is slidably penetrated by a tightening rod 17 having a T-shaped head portion 17a with the T-shaped head portion 17a facing the clamp cap 13. ing. Further, the clamp cap 13 has a long hole 18 through which the T-shaped head 17a of the tightening rod 17 can pass vertically, and a shelf 1 on which the T-shaped head 17a can be caught horizontally.
9 and 9 are formed. In other words, the T-shaped head portion 17a of the tightening rod 17 is adapted to be hooked on the shelf portion 19 when the T-shaped head portion 17a is passed through the elongated hole 18 of the clamp cap 13 and then rotated 90 °. The T-shaped head 17a is provided at the end of the shelf 19.
The stopper 20 is formed so as not to rotate by 90 ° or more.

Further, the clamp body 1 of the tightening rod 17
The coil spring 21 and the spring receiver 22 are coaxially arranged on the outer circumference of the portion projecting to the second side, and the coil spring 21 is provided at the outer end.
An eccentric cam 23 that switches between a strong compression state and a weak compression or non-compression state is rotatably supported by a shaft pin 24. That is, the eccentric cam 23 is previously attached to the tightening rod 17 via the shaft pin 24.

The eccentric cam 23 is provided with a large-diameter portion 23a having a large distance from the shaft pin 24 and a small-diameter portion 23b having a small distance from the shaft pin 24 at intervals of 180 ° in the circumferential direction. There is. Further, the eccentric cam 23 is provided with a hole 23c for rotating the eccentric cam 23.

[0007] The overhead wire 25 is connected to the electric wire clamp 11 as described above.
In order to grip the coil spring 21, first, as shown in FIG. 7, the small diameter portion 23b of the eccentric cam 23 is brought into contact with the spring receiver 22 to bring the coil spring 21 into a slightly compressed or non-compressed state and rotate the tightening rod 17 by 90 °. To make the T-shaped head 17a vertical (in the same direction as the elongated hole 18) so that the T-shaped head 17a is not caught by the clamp cap 13.

Next, the clamp cap 13 is opened around the hinge portion 16 and the overhead wire 25 is inserted between the clamp body 12 and the clamp cap 13.

Then, the clamp cap 13 is closed, and the T-shaped head 17a of the tightening rod 17 is passed through the elongated hole 18,
The tightening rod 17 is rotated 90 ° and the T-shaped head 17a is hooked on the shelf 19.

Then, as shown in FIG. 7, the operating rod 26 of the hole 23c of the eccentric cam 23 is inserted, and 180 ° in the direction of arrow P.
The large-diameter portion 23a is rotated to rotate the spring bearing 2 as shown in FIG.
When it comes into contact with the coil 2, the coil spring 21 is in a strongly compressed state. The clamp cap 13 is now the coil spring 2
The repulsive force of 1 pulls the overhead wire 25 firmly toward the clamp body 12 side.

[0011]

In the electric wire clamp having the above structure, it is difficult to confirm whether or not the eccentric cam 23 has been inverted by the operating rod. For this reason, in many electric wire clamps that hold the overhead wire, there may be a case where the eccentric cam 23 is not inverted by the operating rod, and as a result, the coil spring 21 remains in a weakly compressed or uncompressed state. There is a problem that something will happen.

It suffices to detect such a failure to tighten the eccentric cam 23 later, but as shown in FIG. 6, the state of the eccentric cam 23 in which the coil spring 21 is in a strongly compressed state and the state shown in FIG. Since the state of the eccentric cam 23 when the coil spring 21 is weakly compressed or uncompressed has the same shape, the state of the eccentric cam of the electric wire clamp such as a spacer attached to the overhead wire from the ground It is difficult to determine the state of the eccentric cam 23 by observing with a telescope or the like, which makes it difficult to detect forgetting to tighten the eccentric cam 23.

If the eccentric cam 23 is not completely tightened, the repulsive force of the coil spring 21 restores the eccentric cam 23 to its original state, and the coil spring 21 returns to a slightly compressed or non-compressed state. However, it is difficult to detect such a state later.

[0014]

DISCLOSURE OF THE INVENTION The present invention provides an electric wire clamp which solves the above-mentioned problems. The structure is such that a clamp body having an electric wire holding groove and a clamp cap are hinged on one side of the electric wire holding groove. On the other side of the electric wire gripping groove, a tightening rod having a T-shaped head on the clamp body slidably penetrates with the T-shaped head on the side of the clamp cap. A long hole through which the T-shaped head of the rod passes vertically is formed, and a ledge that hangs sideways is formed, and a coil spring is provided on the outer periphery of the portion of the tightening rod projecting toward the clamp body side. In an electric wire clamp arranged coaxially and provided with an eccentric cam for switching the coil spring between a strongly compressed state and a weakly compressed state or a non-compressed state at the outer end,
The eccentric cam is separated from the tightening rod and is adapted to be attached to the tightening rod when the coil spring is in a strongly compressed state.

[0015]

[Operation] The eccentric cam is configured to be separated from the tightening rod, and when the coil spring is in a strongly compressed state, the eccentric cam is attached to the tightening rod so that the number of eccentric cams and the number of wire clamps are the same first. If it is confirmed that the eccentric cams are sequentially attached to the electric wire clamp and no eccentric cam remains at the end, it can be confirmed that the eccentric cam is not forgotten to be tightened.

When the eccentric cam remains, it is forgotten to tighten it. However, since the electric wire clamp for which the eccentric cam has been forgotten is not equipped with the eccentric cam, the confirmation is easy. Further, when the eccentric cam is separated from the tightening rod, when the eccentric cam is reversed by the operating rod to bring the coil spring into a strongly compressed state, if the reversal is insufficient, the repulsive force of the coil spring 21 causes The eccentric cam 23 is returned to the original position and the tightening rod 1
I will drop from 7. Therefore, by confirming the presence or absence of the eccentric cam 23, it is possible to easily detect the defective portion of the eccentric cam 23.

[0017]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3, parts corresponding to the respective parts in FIGS. 4 to 7 described above are designated by the same reference numerals. The feature of this wire clamp is that the eccentric cam 23 is separated from the tightening rod 17 and can be attached to the tightening rod 17.

That is, the eccentric cam 23 is formed with a substantially U-shaped shaft pin mounting groove 23d, and the eccentric cam 23 has a hook-like shape. The eccentric cam 23 has the shaft pin mounting groove 23d and the shaft pin 2 fixed to the tightening rod 17.
4 is attached to the shaft pin 24. The innermost portion of the shaft pin mounting groove 23d corresponds to the shaft pin mounting portion of the conventional eccentric cam.

The eccentric cam 23 is provided with a large diameter portion 23a having a large distance from the shaft pin 24 and a small diameter portion 23b having a small distance from the shaft pin 24 at an interval of 180 ° in the circumferential direction. The eccentric cam 23 is the same as the conventional eccentric cam 23 in that a hole 23c for rotating the eccentric cam 23 is provided.

The shaft pin 24 is attached to the tightening rod 17 in a state orthogonal to the longitudinal direction of the tightening rod 17, and disk-shaped guide plates 24a are provided at both ends thereof. The disc-shaped guide plate 24a includes a shaft pin 24 and a spring receiver 22.
A gap is provided between the shaft pin 24 and the spring bearing 22 so that the eccentric cam 23 can be easily attached to the shaft pin 24.

The overhead wire 25 is connected to the electric wire clamp 11 as described above.
In order to grip, the overhead wire 25 is inserted between the clamp body 12 and the clamp cap 13 as in the conventional case, and then the T-shaped head portion 17a of the tightening rod 17 is hooked on the shelf portion 19.

Then, as shown in FIG. 1, the shaft pin mounting groove 23d of the eccentric cam 23 is mounted on the shaft pin 24, and then the operating rod 26 is inserted into the hole 23c of the eccentric cam 23.
It is rotated 180 ° in the direction of arrow P to bring the large diameter portion 23a into contact with the spring receiver 22 as shown in FIG. As a result, the coil spring 21 is in a strongly compressed state, and the clamp cap 13 is pulled toward the clamp body 12 side by the repulsive force of the coil spring 21, so that the overhead wire 25 can be firmly gripped.

If the large-diameter portion 23a of the eccentric cam 23 is not in contact with the spring receiver 22, the eccentric cam 2
The repulsive force of the coil spring 21 is applied to 3, so that the eccentric cam 23 is returned to the original position and disengages from the tightening rod 17. It is possible to confirm the construction failure of the eccentric cam 23 by the twist.

The eccentric cam 23 removed from the tightening rod 17 is preferably connected to the electric wire clamp with a string or a wire when shipped from the factory. Also, the eccentric cam 23
It is also possible to confirm that the eccentric cam 23 is forgotten to be tightened by removing the cord or wire after attaching the cord to the tightening rod 17 and counting the number of the cord.

[0025]

As described above, in the electric wire clamp according to the present invention, the eccentric cam is separated from the tightening rod and is attached to the tightening rod when the coil spring is in the strongly compressed state. , It can be confirmed that the eccentric cam is not forgotten to be tightened. Further, if the user forgets to tighten the eccentric cam, it is easy to confirm the tightening, and the eccentric cam can be quickly attached. Furthermore, when the coil spring is in a strongly compressed state, if the eccentric cam inversion operation by the operating rod is insufficient, the eccentric cam will come off from the tightening rod, so that it is possible to eliminate the construction failure of the eccentric cam. The confirmation becomes easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a state before tightening of an electric wire clamp according to an embodiment of the present invention.

FIG. 2 is a view taken along the line BB of FIG.

FIG. 3 is a cross-sectional view of essential parts showing a state after tightening the electric wire clamp of FIG. 1.

FIG. 4 is a side view of a conventional electric wire clamp.

5 is a rear view of the wire clamp of FIG.

FIG. 6 is a cross-sectional view when the coil spring is in a strongly compressed state along the line AA in FIG.

FIG. 7 is a cross-sectional view of the coil spring taken along line AA of FIG. 4 when the coil spring is in a slightly compressed or non-compressed state.

[Explanation of symbols]

 11: Electric wire clamp 12: Clamp main body 13: Clamp cap 14 ・ 15: Electric wire grip groove 16: Hinge part 17: Tightening rod 17a: T-shaped head 18: Elongated hole 19: Shelf part 21: Coil spring 23: Eccentric cam 23d : Shaft pin mounting groove 24: Shaft pin 24a: Disc-shaped guide plate 25: Overhead wire

Claims (1)

[Claims] 1. A clamp main body having a wire grip groove and a clamp cap are hinge-coupled on one side of the wire grip groove,
On the other side of the wire holding groove, a tightening rod having a T-shaped head on the clamp body slidably penetrates with the T-shaped head on the side of the clamp cap, and the clamp cap has a T-shaped portion of the tightening rod. A long hole that allows the shape head to pass vertically is formed, and a shelf that hangs sideways is formed, and a coil spring is coaxially arranged on the outer circumference of the portion of the tightening rod protruding toward the clamp body side. And an eccentric cam for switching the coil spring between a strongly compressed state and a weakly compressed or non-compressed state at the outer end, the eccentric cam being separated from the tightening rod, The electric wire clamp is characterized in that it can be attached to the tightening rod when the is strongly compressed.