JPH0453148Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improved metal wheel passing type retaining clamp configured to enable so-called reverse compression.

[Prior Art] There have been various proposals for a pulley-passing type of strain clamp. The one shown in Figures 7 to 9 is a typical example, which has a jumper socket 11 that can be attached and detached by a bolt 12. The jumper socket attachment parts 3 and 8 of the aluminum clamp 1 and the steel clamp 5 have through holes 4 and 9 for passing the bolt 12 through, and after the clamp body passes through the pulley, the jumper socket 11 is tightened by the bolt 12 as shown in Figures 7 and 8, and finally assembled into a strain clamp.
In these figures, 2 is a slit for facilitating deformation of the aluminum clamp when the bolt is tightened, 6 is the steel clamp compression part, 7 is a locking projection and recess for locking the aluminum clamp, and 10 is a connection part to the insulator. This deadbolt clamp has a jumper socket mounting part of the steel clamp with a circular cross section, but this is to facilitate the rotation of the aluminum clamp when the aluminum clamp, which has been fitted around the electric wire before the steel clamp is compressed, is pulled back and fitted over the steel clamp, and to position the aluminum clamp conveniently over the steel clamp and make it easier to align the respective through holes.

[Problems to be solved by the invention] There is no problem if the aluminum clamp 1 of the retaining clamp configured as described above is compressed by so-called positive compression, which is performed from the insulator connecting part side. When performing so-called reverse compression, which is compression from the tip end of the clamp, the aluminum clamp rotates during the compression process, and as shown in the cross-sectional view in Figure 6, the aluminum clamp rotates by an angle. As a result, the through hole 4 of the aluminum clamp and the through hole 9 of the steel clamp for inserting the bolt may not match.

[Means for Solving the Problems] The present invention aims to provide a retaining clamp that enables simple and reliable reverse compression even in the retaining clamp configured as described above, and its gist is as follows. , in a metal wheel passing type pulling clamp consisting of a steel clamp and an aluminum clamp, each having a through hole for passing a jumper socket mounting bolt at a position corresponding to the mounting hole of the jumper socket, the jumper socket of the steel clamp is The butt attachment part is formed to have a circular cross section, and a protrusion is formed at a position corresponding to the amount of compression and elongation when the aluminum clamp is reversely compressed from the collar of the steel clamp. is configured to be able to fit into the protruding portion in the axial direction from its pull-back end face, and forms a socket to the extent that it facilitates deformation at the jumper socket attachment portion, and furthermore, the through hole of the aluminum clamp and the steel clamp is A reverse compression type retaining clamp is characterized in that one or both of the holes are formed into elongated holes.

[Function] Since the retaining clamp according to the present invention is constructed as described above, after compressing the steel clamp, pull back the aluminum clamp, align its end with the end of the protruding part of the steel clamp, and If you position the slit so that it fits snugly into the protrusion and perform reverse compression, the protrusion will fit into the slit as the aluminum clamp expands as it is compressed, and the aluminum clamp will not rotate and compression will be completed. In this state, the end of the aluminum clamp will come into contact with the collar of the steel clamp,
Decompression is achieved without any problems.

[Examples] The present invention will be described below based on Examples.

FIG. 1 is a front view showing a steel clamp 5 according to the present invention, and hereinafter, the same reference numerals as in the conventional example indicate the same structure. In the present invention, the jumper socket attachment part 8 of the steel clamp is formed with a protrusion 20 at a distance S from the collar part 21, so that the slit 2 of the aluminum clamp can fit properly. It's summery. Figure 2 is the first
It is a cross-sectional view showing the XX section of the figure. In the above, the distance S is such that when the end surface 1a of the aluminum clamp 1 shown in FIG. The length is selected so that it comes into contact with 21. This length S varies depending on the size of the clamp, but can be easily determined by experiment for each size.

FIG. 3 is a plan view showing a state in which the aluminum clamp is set to perform reverse compression in the retaining clamp according to the present invention, and FIG. 4 is a plan view showing a state in which the reverse compression is completed. In FIG. 3, the slit 2 of the jumper socket connection part 3 of the aluminum clamp is set with its end substantially aligned with the end 20a of the protrusion 20,
The aluminum clamp 1 is reversely compressed. It should be noted that the term "approximately" here includes the case where there is some deviation at each end, for example, where the ends are set so as to overlap to some extent before starting compression. Since the slit 2 is formed so as to be guided and fitted into the protrusion 20, the aluminum clamp does not rotate as shown in FIG. 6 during the reverse compression operation. FIG. 5 is a sectional view taken along the line X'-X' in FIG. 4 after the reverse compression is completed in this manner.

In addition, in the conventional example shown in Figures 7 to 9, the through hole for bolt insertion is formed by a circular hole, but this is because only forward compression is considered, and in the case of reverse compression, compression is completed. It is often quite difficult to exactly match the through holes of the aluminum clamp and steel clamp under these conditions. Therefore, it is desirable to form one or both of the aluminum clamp and the steel clamp into an elongated hole so that even if there is some misalignment, this can be absorbed.

Although an example of the protrusion 20 having a rectangular cross section is shown as an example, it is not limited to such a shape, and it is sufficient that the slit of the aluminum clamp fits snugly and its rotation is suppressed. Needless to say. For example, it may be a circular protrusion, as long as it has a length S that defines the end position of the aluminum clamp when it is compressed.

[Effects of the invention] As mentioned above, the retaining clamp according to the invention has the following advantages:
Since the position of the protruding part is set exactly to the position that will be used as a guide for compression and elongation in the case of reverse compression, the aluminum clamp can be easily set during compression work, and there is no possibility that the aluminum clamp will extend too much and hit the brim, or that it does not extend enough. Not only is it possible to always perform complete reverse compression without creating gaps, but since one or both of the bolt insertion holes are elongated holes, there is no risk of misalignment of the holes, making it easy to compress. Today, decompression is becoming more and more popular as overhead power transmission lines become larger, and its usefulness is great.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the steel clamp according to the present invention, Fig. 2 is a cross-sectional view taken along line X-X in Fig. 1, Fig. 3 is a plan view showing the start of reverse compression of the clamp according to the present invention, Fig. 4 is a plan view showing the end of reverse compression, Fig. 5 is a cross-sectional view taken along line X'-X' in Fig. 4, Fig. 6 is a cross-sectional view showing the misalignment of the through holes, Figs. 7 to 9 show a conventional clamp, Fig. 7 is a longitudinal cross-sectional view, Fig. 8 is a cross-sectional view taken along line A-A in Fig. 7, and Fig. 9 is a perspective view of each component. 1: Aluminum clamp, 2: Slit, 3,
8: jumper socket connection portion; 4, 9: through holes for bolt insertion; 5: steel clamp; 11: jumper socket; 12: bolt; 20: protrusion.

Claims (1)

[Scope of utility model registration request] A cross-section of the jumper socket attachment part of the steel clamp in a metal wheel passing type retaining clamp consisting of a steel clamp and an aluminum clamp, each having a through hole for passing the jumper socket attachment bolt at a position corresponding to the jumper socket attachment hole. In addition to forming it into a circular shape, a protrusion is formed at the approximate position corresponding to the amount of compression and elongation when the aluminum clamp is reversely compressed from the flange of the steel clamp, while the jumper socket attachment part of the aluminum clamp has a protrusion on its pullback side end surface. A slit is formed so as to be able to fit into the protruding part in the axial direction and to facilitate deformation in the jumper socket attachment part, and one or both of the through holes of the aluminum clamp and the steel clamp are lengthened. A reverse compression type retention clamp characterized by having a hole.