JPH0626024Y2 - Boltless wire clamp - Google Patents

Description

[Technical Field] The present invention relates to a boltless wire clamp used for an anti-twisting device for an overhead wire, a spacer, and the like.

[Prior art and its problems]

Hold the overhead wire with the clamp body and the clamp cap,
The electric wire clamp that is tightened with bolts and nuts may loosen due to vibration during use, causing the clamp cap to open and fall off the overhead wire.
As an improvement of this, a boltless electric wire clamp as shown in FIGS. 6 to 9 is 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 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 provided with a T-shaped head 17a.
The T-shaped head 17a of the tightening rod 17 has a T-shaped head 17a slidably penetrating therethrough. Further, the clamp cap 13 is formed with an elongated hole 18 through which the T-shaped head 17a of the tightening rod 17 passes vertically and a shelf portion 19 which is laid sideways and hooked. That is, the T-shaped head portion 17a of the tightening rod is adapted to be hooked on the shelf portion 19 after being passed through the elongated hole 18 of the clamp cap 13 and then rotated 90 °. A stopper 20 is formed at the end of the shelf 19 to prevent the T-shaped head 17a from rotating more than 90 °.

Further, a coil spring 21 and a spring receiver 22 are coaxially arranged on the outer periphery of the portion of the tightening rod 17 protruding toward the clamp body 12 side, and the coil spring 21 is provided at the outer end in a strongly compressed state and a weakly compressed or non-compressed state. Eccentric cam 23 to switch is shaft pin 24
It is rotatably supported by. 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. Further, the eccentric cam 23 is provided with a hole 23c for rotating the eccentric cam 23.

In order to grip the overhead wire 25 with such a boltless wire clamp 11, first, as shown in FIG.
The coil spring 21 is weakly compressed or non-compressed so that 23b comes into contact with the spring receiver 22, and the tightening rod 17 is rotated 90 ° to make the T-shaped head 17a vertical (in the same direction as the elongated hole 18).
Make sure that the T-shaped head 17a does not get caught in the clamp cap 13. Next, the clamp cap 13 centered on the hinge portion 16 is opened, and the overhead wire 25 is inserted between the clamp body 12 and the clamp cap 13. Next, the clamp cap 13 is closed, the T-shaped head 17a of the tightening rod is passed through the oblong hole 18,
The tightening rod 17 is rotated 90 ° and the T-shaped head 17a is hooked on the shelf 19. Further, as shown in FIG. 9, the hole of the eccentric cam 23
When the operating rod 26 is inserted into 23c and 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. 8, the coil spring 21 is in a strongly compressed state.
As a result, 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.

Although the conventional boltless wire clamp has the above structure, if the shaft pin of the eccentric cam is sheared or the shaft pin insertion part of the tightening rod is damaged, the tightening force will disappear and the tightening rod will rotate. There is a risk that the T-shaped head will come off the shelf of the clamp cap, the clamp cap will open, and the whole will fall off the overhead line. Especially when the boltless wire clamp is used as a clamp for a twist preventive device for preventing snow from accumulating on overhead wires, the falling of the clamp may cause a heavy weight to drop and cause a serious accident.

[Means for solving problems and their effects]

In order to solve the above-mentioned problems of the prior art, the present invention hinges a clamp body having a wire gripping groove and a clamp cap on one side of the wire gripping groove, and clamps it on the other side of the wire gripping groove. A tightening rod having a T-shaped head on the main body slidably penetrates with the T-shaped head on the side of the clamp cap, and the T-shaped head of the tightening rod passes vertically through the clamp cap. With a long hole that can be
A ledge that is laid horizontally is formed, and a coil spring is coaxially arranged on the outer periphery of the portion of the tightening rod that projects toward the clamp body, and the coil spring is placed in a strongly compressed state at the outer end. In a boltless electric wire clamp provided with a switching member that switches between a weakly compressed state and a non-compressed state, a retaining protrusion is formed in the same direction as the T-shaped head at a portion of the tightening rod located between the clamp body and the clamp cap. In addition, with the T-shaped head of the tightening rod hooked on the shelf of the clamp cap, a leaf spring having a substantially U-shaped cross section for preventing the T-shaped head from rotating is inserted into the elongated hole. It is characterized by being inserted so as to straddle.

According to the above configuration, even if the switching member is damaged and the tightening force of the coil spring disappears, the tightening rod is prevented from rotating by the leaf spring having a substantially U-shaped cross section, and is prevented from coming off by the retaining protrusion. Since the clamp cap does not open completely, it can be prevented from falling off the overhead line. If it can be temporarily prevented from falling off the overhead line, it is possible to find the abnormality at the time of inspection and repair or replace it.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. 1 to 3, the previously described FIGS. 6 to 9
The parts corresponding to the parts in the figure are denoted by the same reference numerals. The feature of this boltless wire clamp 11 is that a portion of the tightening rod 17 located between the clamp body 12 and the clamp cap 13 has a retaining projection 31 in the same direction as the T-shaped head 17a as shown in FIG. With the T-shaped head 17a of the tightening rod hooked on the shelf 19 of the clamp cap 13 (see FIG. 3), the elongated hole of the clamp cap 13 is formed.
This means that a leaf spring 32 having a substantially U-shaped cross section as shown in FIG. 5 is inserted into 18 so as to straddle the T-shaped head 17a.

Therefore, even if the shaft pin 24 of the eccentric cam 23 is sheared or the shaft pin insertion portion of the tightening rod 17 is damaged,
Even when the tightening force of the coil spring 21 disappears, the tightening rod 17 is prevented from rotating by the leaf spring 32 having a substantially U-shaped cross section, and is prevented from coming off by the retaining projection 31. It never opens.

In addition, on the inner surface of the clamp cap 13, the retaining protrusion 31
A recess is formed to accommodate the.

[Effect of device]

As described above, in the boltless wire clamp according to the present invention, even if the switching member such as the eccentric cam is damaged and the tightening force of the coil spring is lost, the tightening rod is prevented from rotating by the leaf spring having a substantially U-shaped cross section. In addition, since the stopper cap is prevented from coming off by the stopper protrusion, there is an advantage that the clamp cap does not open completely and it is possible to prevent the clamp cap from falling off.

[Brief description of drawings]

1 to 3 are a side view, a rear view and a front view of a boltless electric wire clamp according to an embodiment of the present invention, FIG. 4 is a plan view of a tightening rod used in the clamp, and FIG. 5 is the same leaf spring. FIG. 6, FIG. 6 and FIG. 7 are side views and rear views of a conventional boltless electric wire clamp, and FIGS. 8 and 9 are the case where the coil spring is in a strongly compressed state along the line AA in FIG. FIG. 3 is a cross-sectional view in the case of a weak compression or an uncompressed state. 11 ... Boltless wire clamp, 12 ... Clamp body, 13 ...
Clamp cap, 14/15 ... Wire grip groove, 16 ... Hinge part, 17 ... Tightening rod, 17a ... T-shaped head, 18 ... Oblong hole, 1
9 ... Shelves, 21 ... Coil springs, 23 ... Eccentric cams, 24 ... Axis pins, 25 ... Overhead wires, 31 ... Prevention protrusions, 32 ... Leaf springs.

Claims (1)

[Scope of utility model registration request] 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 through which the head of the shape passes vertically and a shelf part that lies sideways are formed, and a coil spring is coaxially arranged on the outer periphery of the portion of the tightening rod projecting toward the clamp body side. In the boltless wire clamp, the outer end of which is provided with a switching member for switching the coil spring between a strongly compressed state and a weakly compressed state or a non-compressed state, a portion of the tightening rod located between the clamp body and the clamp cap. In the state where the T-shaped head of the tightening rod is hooked on the shelf of the clamp cap, the length of Borutoresu wire clamping, wherein the leaf spring approximately C-shaped cross section for preventing rotation of the T-shaped head that is inserted so as to straddle the T-shaped head portion.