JPS587795Y2 - Clamp for overhead wires - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clamp for attaching a spacer, damper, etc. to an overhead electric wire.

Conventionally, in order to attach spacers, dampers, etc. to electric wires, a clamp to which spacers, dampers, etc. are attached is generally used.

This clamp has a clamp body 2' as shown in Figure 3.
Wire gripping grooves 4' and 5' are provided on opposing surfaces of the two-piece body in which the cap 3' and the cap 3' are hingedly connected 6', and the gripping grooves 4'
The electric wire 1' is inserted through the clamp body 2' and the cap 3', and the clamp body 2' and the cap 3' are tightened and fixed with bolts 7'.

At this time, since the clamp body 2', cap 3', and electric wire 1' are in metal-to-metal contact, the inner surfaces of the gripping grooves 4' and 5' are lined with an elastic material 8' made of rubber, plastic, etc. to ensure gripping. I have to.

On the other hand, the electric wire 1' is usually made by twisting round aluminum wires in multiple layers, and there are twist grooves on the surface of the electric wire 1'.

For this reason, the inner surface of the elastic body 8' is provided with a concave-convex strip that matches the twist groove on the surface of the electric wire 1', and the concave-convex strip fits into the twist groove.

However, when attaching the clamp, it is difficult to match the uneven stripes of the elastic body with the twisted grooves of the electric wire, so that the clamp is often not fully tightened and fixed.

In view of this, the present invention has been developed to provide a clamp for use with overhead wires whose outer layer is separated from the stranded wires, by attaching the clamp to the surface of an elastic body such as rubber so that the length of the longest part of the cross section is 0.8 to 0.8 to the diameter of the stranded wires of the outer layer of the wire. 1.
A large number of protrusions with a height of approximately 0.5 times the diameter of the wire and a spacing of 1.0 to 1.5 times the diameter of the wire are randomly provided, and the clamp is tightened to the wire through these projections. The attachment is fixed.

Next, this will be explained in more detail based on the embodiment shown in the drawings.

Figure 1 shows the case where the present invention is applied to a nut cracker type clamp.The clamp body 2 and the cap 3 are connected by a hinge pin 6, the bolt 7 is tightened at the base, and the electric wires between the clamp body 2 and the cap 3 are connected. A large number of protrusions 9 are randomly provided on the surface of the elastic body 11N74 in contact with the wire 1 by pressing a button on a clamp fixed to the electric wire 1 through an elastic body 8 made of chloroprene rubber lined in the gripping grooves 4 and 5.

In FIG. 1, 10 indicates a spacer body 11 and a clamp body 2.
The pin attached to the is shown.

The length of the longest part of the cross section (plane perpendicular to the height direction) of the numerous protrusions 9 provided on the inner surface of the elastic body 8 according to the present invention is as shown in Fig. 2A and 2B. Outer layer twisted wire diameter 0.
The height is preferably about 0.5 times the diameter of the isotropic wire, and the distance between the protrusions 9 is about 1.0 to 1.5 times the diameter of the isotropic wire.
The shape may be hemispherical, conical, or pyramidal, and it can be easily provided on the inner surface of the elastic body 8 by molding.

Moreover, such an elastic body 8 is attached to the clamp body 2 or the cap 3.
The wire gripping groove 4 or 5 of the elastic body 8 is lined with shallow irregularities as shown in Figure 2 and 8 to ensure adhesion. You can also do this.

In addition, although the above-mentioned embodiment showed the case where it was applied to a nut cracker type clamp attached to a spacer, it is not limited to this.

As explained above, according to the present invention, in a clamp used for an overhead wire whose outer layer is made of stranded wire, the surface of the rubber-like elastic body lined in the wire gripping groove of the clamp body and cap has a size equal to that of the wire outer layer. 0.8 to 1.2 times the stranded wire diameter, the height is approximately 0.5 times the isotropic wire diameter, and the spacing is i, o ~ of the isotropic wire diameter
Since a 1.5 times as many protrusions are provided and the clamp is fixed through these protrusions, the protrusions enter the twist grooves on the surface of the wire, and the protrusions are compressed on the peaks on the surface of the wire. It is firmly fixed and has the advantage of being easier to install regardless of the twisting grooves compared to the conventional structure with uneven stripes that match the twisting grooves.

If the length of the longest part of the cross section is less than 0.8 times the diameter of the stranded wire in the outer layer of the wire, the protrusion is too small compared to the stranded groove in the outer layer of the wire, and the protrusion will fit loosely into the groove. , sufficient gripping force cannot be obtained, and if it exceeds 1.2 times, it is too thick compared to the twisted groove, and the amount of protrusion that enters into the twisted groove is small, and sufficient gripping force cannot be obtained. I can't do it.

Furthermore, if the height of the protrusion is 0.4 times or less than the diameter of the same strand, the amount of penetration of the protrusion into the twisting groove is small, and sufficient gripping force cannot be obtained; Then, the gap between the inner circumferential surface of the elastic body and the outer layer of the electric wire opens, the gripping area of the entire elastic body decreases, and the gripping force decreases.

Furthermore, if the spacing between the protrusions is larger than 1.5 times the diameter of the isotropic wire, the density of the protrusions will decrease and the clamping and fixing will be incomplete, and if the spacing is less than 1.0 times, the effect of tightening and fixing will not increase. However, manufacturing is complicated.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a clamp for overhead electric wires according to the present invention, and Fig. 2 A and C are respectively a front view, a side view, and a side view showing an example of the rubber-like elastic body used in the clamp of the present invention. The rear view and FIG. 3 are side views of a conventional electric wire clamp. 1: Electric wire, 2: Clamp body, 3: Cap, 4.5:
Wire gripping groove, 8: rubber-like elastic body, 9: protrusion.

Claims (1)

[Scope of utility model registration request] In a clamp for overhead wires in which the outer layer is separated from the stranded wires, a large number of protrusions are provided on the surface of the elastic body lined in the wire gripping groove of the clamp body and the cap, and the length of the longest part of the protrusions in the cross section is 0.8 to 1.2 times the diameter of the stranded wire in the outer layer of the wire, the height is approximately 0.5 times that of the allotropic wire, and the spacing is 1.0 times the diameter of the allotropic wire.
A clamp for overhead electric wires, characterized in that it is ~1.5 times as large.