JP2872082B2 - Wire clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp for an electric wire in which a clamp body for holding an electric wire and a clamp cap are tightened by utilizing a compression repulsive force of an elastic body.

[0002]

2. Description of the Related Art Generally, 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, and the like) by an electric wire clamp. As an electric wire clamp, there is a boltless electric wire clamp configured to tighten a clamp body and a clamp cap by using a compression repulsive force of an elastic body without using a tightening bolt. An example of an electric wire clamp configured to tighten the clamp body and the clamp cap by utilizing the compression repulsive force of the elastic body will be described with reference to FIGS.

[0003] That is, this electric wire clamp is used for the electric wire 11.
Is provided with a clamp body 13 and a clamp cap 15 for gripping. The clamp body 13 and the clamp cap 15 are openably and closably coupled to each other on one side of the electric wire holding grooves 17 and 19 by a hinge portion 20, and on the other side, a tightening rod 23 and
The tightening mechanism 21 includes a coil spring 25, an eccentric cam 27 and the like.

The clamping rod 23 of the clamping mechanism 21 penetrates through the clamp body 13 and has a T-shaped engaging portion 29 at one end for engaging with the open end of the clamp cap 15 and a shaft pin at the other end. The eccentric cam 27 is rotatably attached to the structure 31. The coil spring 25 is disposed between the eccentric cam 27 and the clamp body 13 with the washer 33 and the tightening rod 23 passed through the coil spring 25.

At the open end of the clamp cap 15, a T-shaped engaging portion 29 of the tightening rod 23 has a cut (or a long hole) 35 through which the T-shaped engaging portion 29 can pass when oriented in a direction perpendicular to the electric wire, and is oriented in a direction parallel to the electric wire 11. And a stepped portion 37 to be hooked are formed. That is, the clamp cap 15 can be opened and closed when the T-shaped engaging portion 29 of the tightening rod 23 is oriented in a direction perpendicular to the electric wire 11, and when the eccentric cam 27 is rotated by 90 ° in the closed state, the T-shaped engaging portion is opened. The part 29 is caught on the shelf part 37 and cannot be opened.

The eccentric cam 27 is U-shaped and rotates about the shaft pin 31. In the non-compressed state shown in FIG. 5, the operation rod 40 is inserted into the hole 41 to rotate in the direction of arrow X. When this is done, the coil spring 25 is in a compressed state, and in the compressed state shown in FIG. 6, when the operating rod 40 is rotated in the arrow Y direction, the coil spring 25 is in a non-compressed state.

Next, a procedure for gripping an electric wire with the electric wire clamp will be described. First, as shown in FIG. 5, the eccentric cam 27 does not compress the coil spring 25. Next, the eccentric cam 27 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, and after the clamp cap 15 is closed, the eccentric cam 27 is rotated by 90 ° to engage the T-shaped engaging portion 29 with the clamp cap 15. Next, as shown in FIG.
Insert the operation rod 40 into the hole 41 of
Rotate °. Then, as shown in FIG. 6, the eccentric cam 27 compresses the coil spring 25, so that the repulsive force tightens the clamp body 13 and the clamp cap 15, so that the electric wire 11 can be firmly gripped.

[0008] The 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 suspended vehicle that is suspended on the electric wire and moves on the electric wire, moves on the electric wire, and moves to a predetermined position. Is stopped by operating the eccentric cam at that position.

[0009]

However, the number of wire clamps to be mounted on one transmission line is very large, so that there is a problem that fastening of the wire clamp is sometimes forgotten. In particular, spacers used in multi-conductor transmission lines with four or more conductors have a very large number of wire clamps because there are four or more wire clamps in one spacer, the same as the number of power lines. It is easy to forget to tighten. Further, after closing the clamp cap, the T-shaped engaging portion is rotated by 90 ° to engage with the clamp cap, but the eccentric cam is tightened in a state where the T-shaped engaging portion is not accurately rotated by 90 °. In such a case, there is a problem that the T-shaped engaging portion later comes off the clamp cap and the tightening force is lost.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to prevent forgetting to tighten a wire clamp and to detect a state in which a T-shaped engagement portion is not accurately rotated by 90 °. Provided is an electric wire clamp, wherein the configuration is such that a clamp body having an electric wire gripping groove and a clamp cap are hinged on one side of the electric wire gripping groove and tightened by a tightening mechanism on the other side. And the tightening mechanism penetrates the clamp body,
A clamping rod having an engagement portion with a clamp cap at one end and an eccentric cam at the other end; and a coil spring disposed between the eccentric cam and the clamp body, and taking a compressed state and a non-compressed state by rotation of the eccentric cam. In the clamp for an electric wire comprising: an eccentric cam, a forgotten tightening detection plate is provided so as to project from the eccentric cam. When the coil spring is in a non-compressed state, the plate surface is in contact with the side wall surface of the clamp body. It is parallel, and when the coil spring is in a compressed state, its plate surface engages with the side wall surface of the clamp body.

[0011]

When the eccentric cam is in a state where the coil spring is not compressed, the eccentric cam protrudes from the outer surface of the eccentric cam. It can be easily detected. When the coil spring is in the non-compressed state, the plate surface is parallel to the side wall surface of the clamp body, and when the coil spring is in the compressed state, the plate surface engages the side wall surface of the clamp body. When the eccentric cam is to be tightened in a state where the T-shaped engaging portion is not exactly rotated by 90 °, the forgotten tightening detection plate is turned on by the side wall of the clamp body during the tightening of the eccentric cam. , It is possible to easily detect that the T-shaped engaging portion is not rotated by 90 °.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIGS. 1A and 1B and FIGS. 2A and 2B show an embodiment of the present invention. The same parts as those in FIGS. 3 to 6 are denoted by the same reference numerals.

In the electric wire clamp according to the present invention, the clamp body 13 having the electric wire holding grooves 17 and 19 and the clamp cap 15 are hingedly connected on one side of the electric wire holding grooves 17 and 19, and the tightening mechanism 21 on the other side. The tightening mechanism 21 is configured to be
Penetrate the clamp body 13 and clamp cap 1 at one end
5 has a T-shaped engaging portion 29 which engages with the eccentric cam 2 at the other end.
And a coil spring 25 disposed between the eccentric cam 27 and the clamp body 13 to take a compressed state and a non-compressed state by the rotation of the eccentric cam 27. It is the same as the clamp, but is characterized in that the eccentric cam 27 is provided with a forgotten tightening detection plate 50.

The tightening forgetting detection plate 50 is formed by bending a plate made of plastic or metal into an L-shape, and protrudes from the upper surface of the eccentric cam 27. The fastening failure detection plate 50 may be made of the same material as the eccentric cam 27 and formed integrally with the eccentric cam 27. As shown in FIGS. 1A and 2B, the forgoing tightening detection plate 50 protruding from the upper surface of the eccentric cam 27 has a plate surface 50 before the eccentric cam 27 is tightened.
a is fixed so as to be parallel to the side wall surface 13a of the clamp body 13, and when the eccentric cam 27 is tightened, as shown in FIGS. 13 is provided so as to engage with the side wall surface 13a.

Next, a procedure for gripping an electric wire with the electric wire clamp will be described. First, although not shown, the eccentric cam 27
, The eccentric cam 27 is rotated to orient the T-shaped engaging portion 29 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,
Close the clamp cap 15. After a while, FIG.
(A) As shown in (B), the eccentric cam 27 is rotated by 90 ° to engage the T-shaped engaging portion 29 with the clamp cap 15. In such a state, the plate surface 50 a of the forgetting-to-tighten detection plate 50 is parallel to the side wall surface 13 a of the clamp body 13.

Next, as shown in FIG.
Insert the operation rod 40 into the hole 41 of
Rotate °. Then, as shown in FIGS. 2A and 2B, 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. At this time, the plate surface 50 of the fastening forgetting detection plate 50
a engages with the side wall surface 13 a of the clamp body 13.

If the operator forgets to tighten the eccentric cam 27, the forgetting to detect the tightening of the eccentric cam 27 can be easily detected by visual observation because the forgetting to tighten detection plate 50 projects from the outer surface of the eccentric cam 27. In addition, the T-shaped engaging portion 29
If the eccentric cam 27 is to be tightened in a state where the eccentric cam 27 is not rotated by 0 °, the forgotten tightening detection plate 50 comes into contact with the side wall 13a of the clamp body 13 during the tightening of the eccentric cam 27. Therefore, it can be easily detected that the T-shaped engaging portion has not been rotated by 90 °.

The forgotten tightening detection plate 5 used in the present invention
No particular limitation is imposed on the material or shape of the clamp body. When the coil spring is in a non-compressed state, its plate surface is parallel to the side wall surface of the clamp body, and when the coil spring is in a compressed state, its plate surface is Any structure that engages with the side wall surface may be used. For example, as the shape of the fastening forgetting detection plate, a wire-shaped plate may be formed by arranging a plurality of wire-shaped members in parallel, or may be formed by bending a wire-shaped plate into a U-shape. . In the present invention, "parallel" includes a state close to parallel, and "engagement" does not necessarily mean that the forgotten tightening detection plate is in contact with the side wall surface of the clamp body. Further, it is preferable to apply a conspicuous color to the fastening forgetting detection plate 50 in order to increase the alert. Also, a nighttime paint or the like may be applied.

[0019]

As described above, in the wire clamp according to the present invention, the eccentric cam is provided with the forcibly tightened detection plate so as to protrude.
It is possible to easily detect forgetting to tighten the eccentric cam visually.
Further, if the eccentric cam is to be tightened while the T-shaped engaging portion is not correctly rotated by 90 °, the forgotten tightening detection plate comes into contact with the side wall of the clamp body during the tightening of the eccentric cam. It can be easily detected that the shape engaging portion has not been rotated by 90 °.

[Brief description of the drawings]

1A and 1B show a state before tightening of an electric wire clamp according to the present invention, wherein FIG. 1A is a side view, and FIG.

FIGS. 2A and 2B show a state after tightening of the wire clamp according to the present invention, wherein FIG. 2A is a side view, and FIG.

FIG. 3 is a front view of a conventional electric wire clamp.

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

FIG. 5 is a cross-sectional view of a main part showing a state before tightening of a conventional wire clamp.

FIG. 6 is a sectional view of a main part showing a state after tightening of a conventional wire clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electric wire 13 Clamp main body 13a Side wall of clamp main body 15 Clamp cap 17, 19 Electric wire holding groove 20 Hinge part 21 Tightening mechanism 23 Tightening rod 25 Coil spring 27 Eccentric cam 29 T-shaped engagement part 50 Tightening forgetting detection plate 50a Tightening forgetting detection plate Board surface

Continuation of the front page (56) References JP-A-6-237518 (JP, A) JP-A-59-164431 (JP, U) JP-A-1-58230 (JP, U) JP-A 60-31123 (JP, U.S.A.) , U) (58) Field surveyed (Int.Cl. ⁶ , DB name) H02G 7/00-7/22

Claims (1)

(57) [Claims] 1. A clamp body having a wire holding groove and a clamp cap are hingedly connected on one side of the wire holding groove and tightened by a tightening mechanism on the other side, and the tightening mechanism comprises a clamp. A clamping rod that penetrates the main body, has a T-shaped engaging portion that engages the clamp cap at one end, and has an eccentric cam at the other end, and is disposed between the eccentric cam and the clamp body, and is rotated by the eccentric cam. In an electric wire clamp comprising a coil spring in a compressed state and a non-compressed state, an eccentric cam is provided with a forgotten tightening detection plate, and the forgotten tightening detection plate is provided when the coil spring is in an uncompressed state. The plate surface is parallel to the side wall surface of the clamp body, and the plate surface is engaged with the side wall surface of the clamp body when the coil spring is in a compressed state. Clamp for electric wires.