JPH066664Y2 - 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 wire clamp as shown in FIGS. 9 to 12 is known.

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. Also, the wire grip groove
On the other side of 14 and 15, a tightening rod 17 having a T-shaped head 17a on the clamp body 12 slidably penetrates with the T-shaped head 17a facing the clamp cap 13. Further, the clamp cap 13 is formed with an elongated hole 18 through which the T-shaped head portion 17a of the tightening rod 17 passes vertically and a shelf portion 19 which lies sideways and is caught. That is, the T-shaped head 17a of the tightening rod
After passing through the oblong hole 18 of the clamp cap 13 and rotating 90 °, the hook is caught on the shelf 19. The shelf
A stopper 20 is formed at the end of 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 placed at the outer end in a strongly compressed state and a weakly compressed or non-compressed state. An eccentric cam 23 that is switched to is rotatably supported by a shaft 24. The eccentric cam 23 has a shaft 24
A large-diameter portion 23a having a large distance from and a small-diameter portion 23b having a small distance from the shaft 24 are provided at intervals 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. 12, the small diameter part of the eccentric cam 23 is
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 is opened around the hinge portion 16 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,
Rotate the tightening rod 17 by 90 ° and move the T-shaped head 17a to the shelf 19
Hang on. Further, as shown in FIG. 12, the operating rod 26 is inserted into the hole 23c of the eccentric cam 23 and rotated by 180 ° in the direction of arrow P to bring the large diameter portion 23a into contact with the spring bearing 22 as shown in FIG. Then, 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.

The conventional boltless wire clamp has the above structure, but if the coil spring breaks for some reason and the tightening force disappears, the tightening rod can 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.

[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 wire clamp in which an eccentric cam that switches between a weakly compressed state and a non-compressed state is pivotally supported, in the state where the T-shaped head portion of the tightening rod is hooked on the shelf portion of the clamp cap, the T-shaped portion is inserted into the elongated hole. It is characterized in that a leaf spring having a substantially U-shaped cross section for preventing rotation of the head is inserted.

After tightening as described above, if a leaf spring with a generally U-shaped cross section is inserted into the long hole, the tightening rod will not rotate even if the tightening force of the coil spring is lost. Can be prevented.

〔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.
This is the case where the boltless wire clamp according to the present invention is used in a twist preventive device for overhead wires. Therefore, the arm 31 is horizontally compressed and fixed to the lower portion of the boltless wire clamp 11, and the weight 32 is attached to both ends thereof.

1 to 3, parts corresponding to the respective parts in FIGS. 9 to 12 described above are designated by the same reference numerals. The feature of this boltless electric wire clamp 11 is that when the overhead wire 25 is tightened by the clamp body 12 and the clamp cap 13 (actually, it is tightened via the armor rod 33), the long hole 18 of the clamp cap 13 Head
That is, the leaf spring 34 having a substantially U-shaped cross section is inserted so as to straddle 17a.

The leaf spring 34 has a substantially U-shaped cross section as shown in FIGS. 4 (a) to 4 (d), but cuts 34c are made from both sides in the middle portions of both leg portions 34a and 34b, respectively, and both ends are cut. The side is bent outward. The alternate long and short dash line 34d is a bending line. The width W of the leaf spring 34 is the width N of the slot 18 (first
(See the figure). Therefore, when the leaf spring 34 is pushed into the elongated hole 18, a repulsive force for expanding the wall of the elongated hole 18 is generated in the leaf spring 34, and the leaf spring 34 does not come out of the elongated hole 18.

Therefore, even if the coil spring 21 is damaged, the tightening rod 17 does not rotate and the clamp cap 13 does not open because the T-shaped head 17a is held by the leaf spring 34.

5 to 8 show another embodiment of the present invention. In the case of this boltless electric wire clamp 11, the overhead wire 25 is clamped by the clamp body 12 and the clamp cap 13, and is made to be adjacent to the T-shaped head 17a of the tightening rod, and the cross section of the elongated hole 18 of the clamp cap 13 is substantially the same. That is, the U-shaped leaf spring 36 is inserted. The leaf spring 36 has a substantially U-shaped cross section as shown in FIGS. 8 (a) to 8 (c), but has hook portions 36a bent outward at both ends. Therefore, when the leaf spring 36 is inserted into the long hole 18, the hook portion 36a is caught on the edge of the long hole 18 and cannot be pulled out, as shown in FIG.
Further, the rotation of the T-shaped head 17 is also blocked.

[Effect of device]

As described above, according to the present invention, the clamp cap and the clamp cap are tightened, that is, the T-shaped head of the tightening rod is hooked on the step of the clamp cap, and Since a leaf spring having a substantially U-shaped cross section for preventing rotation of the T-shaped head is inserted, even if the coil spring is broken and the tightening force disappears, the tightening rod will not rotate, so the clamp cap will not rotate. It will never open. Therefore, it is possible to reliably prevent an accident in which the twist preventive device, the spacer, or the like falls off the overhead line.

[Brief description of drawings]

1 and 2 are a partially cutaway front view and a partially omitted side view showing a state in which a boltless wire clamp according to an embodiment of the present invention is used in an anti-twisting device for overhead lines, and FIG. Fig. 1 is a cross-sectional view taken along the line I-I, Fig. 4 (a) (b) is a side view and a plan view of the leaf spring used for the clamp, and Fig. 4 (c) (d) is
(a) is a sectional view taken along line II-II and line III-III, FIGS. 5 and 6 are front and side views showing a boltless wire clamp according to another embodiment of the present invention, and FIG. Of Figure 5
IV-IV sectional view, FIGS. 8 (a) (b) (c) are plan views, side views and rear views of the leaf spring used for the clamp, and FIGS. 9 and 10 are conventional boltless wire clamps. FIG. 11 is a side view and a rear view, and FIGS. 11 and 12 are cross-sectional views taken along the line VV of FIG. 9 when the coil spring is in a strongly compressed state and in a weakly compressed or uncompressed state. 11 …… Boltless wire clamp, 12 …… Clamp body,
13 …… Clamp cap, 14 ・ 15 …… Electric wire grip groove, 16…
… Hinge part, 17 …… Tightening rod, 17a …… T-shaped head, 1
8 …… Oval hole, 19 …… Shelves, 21 …… Coil spring, 23 …… Eccentric cam, 24 …… Shaft, 25 …… Overhead wire, 34 ・ 36 …… Leaf spring with approximately U-shaped cross section.

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 a boltless wire clamp whose eccentric cam for switching the coil spring between a strongly compressed state and a weakly compressed state or a non-compressed state is pivotally supported at the outer end, the T-shaped head of the tightening rod is attached to the shelf of the clamp cap. A boltless electric wire clamp, characterized in that a leaf spring having a substantially U-shaped cross section for preventing rotation of the T-shaped head is inserted into the elongated hole in a state of being hooked on the portion.