JPS5840884B2 - Clamp device for steel core aluminum stranded wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamping device that can easily and firmly clamp a relatively large-diameter steel-core aluminum stranded wire.

The drawings will be explained by taking a retaining clamp as an example.

The steel-core aluminum stranded wire R to be held is made by cutting off the aluminum wire at the end to expose a predetermined length of the steel-core wire W.

The steel sleeve main body 1 has a puller 1a on one side of a large diameter part having the same outer diameter as the stranded wire R, and a small diameter part 1b protruding from the other side.An annular engagement groove is provided on the outer periphery of the small diameter part 1b. Also, a bottomed hole is bored into which the steel core wire W can be inserted along the axis from the small diameter side.

Further, there is a radial threaded hole in the large diameter portion, and the tip of the push screw 2 screwed into it is designed to bite into the steel core wire W inserted into the bottomed hole and temporarily fasten it.

After the set screw 2 is firmly screwed in, the head is cut off and the set screw 2 is buried in the main body.

The steel sleeve piece 3 is a gutter-like body capable of gripping the steel core wire W, and when gripped, leaves a sufficient interference between adjacent pieces to form a cylindrical shape with an outer diameter approximately equal to that of the stranded wire R. It's Nishide.

In addition, its length is such that it can be inserted between the end of the aluminum stranded wire and the main body 1, and an engaging edge 3a is provided on the inner diameter portion of one end so that it can be engaged with the annular retaining groove of the small diameter portion of the main body. .

Although the figure shows an example of a half-split semicircular shape, the shape is not limited to half-split as long as it is equally divided.

An annular groove 3b is provided on each outer periphery so that the husband and wife can be bound together with a binding wire 4 to prevent them from coming apart.

This annular groove 3b ensures divided compression in the compression process described later.

This is because without this annular groove, the compressive force would spread to the front and back of the compressed location in the axial direction, weakening the gripping force at the location immediately below the compression.

Further, when the adjacent portion is subsequently compressed, the previously compressed portion becomes loose.

The annular groove blocks the spread of these undesirable forces. The aluminum sleeve 5 spans the aluminum strand R, the steel sleeve piece 3, and the main body 1, and can be inserted into the aluminum sleeve 5. Due to its compression, the steel core wire is compressed by the steel sleeve piece 3. Enables W tightening.

The present invention is configured as described above.

The aluminum strands are cut off, and the steel core wire W exposed for a predetermined length is passed through the tube of the bundled steel sleeve pieces, and its tip is brought into contact with the bottom of the bottomed hole of the main body 1.

After temporarily fastening by screwing in the push screw 2, its head is broken off, and the dovetail sleeve 5, which had been previously fitted into the twisted wire R, is moved to a predetermined position and compressed.

The second cross-section is deformed and strengthened by compression as shown in FIG. 3, and ramping is performed.

A well-known method for clamping steel-core aluminum stranded wire is to first crimp a steel sleeve onto the steel core wire, then cover it with an aluminum sleeve and compress it again.

However, this method had drawbacks such as the fact that the steel sleeve was bent during the initial compression, making it difficult to insert it into the aluminum sleeve.

To solve this problem, a clamping method is known (Japanese Patent Publication No. 51-30676) in which the steel sleeve is not compressed and the aluminum sleeve is clamped only by compression.

There, the main body 1 of the invention and the steel sleeve piece 3 are integrated.

That is, a plurality of axial slots are inserted in the portion connected to the main body.

This structure is such that the slotted portion of the steel sleeve strongly grips the steel core wire by compressing the aluminum sleeve.

However, recently, the diameter of steel-core aluminum stranded wire has become larger, and the diameter of the steel sleeve has also increased accordingly. Due to the elastic resistance at the slotted base, sufficient gripping force cannot be obtained by compressing the aluminum sleeve alone. A case is occurring.

In contrast, in the present invention, the main body and the steel sleeve piece are separate pieces, so the above-mentioned elastic resistance does not occur.

The compressive force applied to the aluminum sleeve directly acts as a gripping force on the steel core wire.

Similarly, since they are both separate pieces, an appropriate material can be selected for the steel sleeve piece 3 regardless of the material of the main body 1.

It is also possible to form a non-slip surface such as a file on the inner diameter of the steel sleeve piece 3 and harden it by quenching to increase the gripping force.

Further, even if the inner surface of the steel sleeve piece is formed to have the same radius so that it can be closely attached to the steel core wire, since the steel sleeve piece is divided into a plurality of parts, there is no problem in inserting the steel core wire.

In this respect, the above-mentioned known example had a disadvantage in that the inner diameter of the slotted portion had to be made somewhat larger than the outer diameter of the steel core wire in order to facilitate insertion of the steel core wire into the slotted portion.

Although the present invention has been described above with respect to a retaining clamp, it can also be implemented on a straight sleeve as shown in FIG. It's self-evident.

As described above, the present invention is characterized in that by forming the steel sleeve into a plurality of gutter-like bodies, it is possible to retain or connect large-diameter electric wires, which was not easily possible with conventional structures.

[Brief explanation of the drawing]

FIG. 1 is a front view of the retaining clamp, FIGS. 2 and 3 are AA cross-sectional end views before and after compression, respectively, and FIG. 4 is a front view of the straight sleeve. 1...Body, 1a...Handle, 1b...
...Small diameter part, 2...Press screw, 3...
...Steel sleeve piece, 3a...Engagement edge, 3b...
...Annular groove, 4...Binding line, 5...
...Aluminum sleeve, R...Steel core aluminum stranded wire, W...Steel core wire.

Claims (1)

[Scope of Claims] 1. A large-diameter portion having the same outer diameter as the steel-core aluminum stranded wire, a smaller-diameter portion having a smaller diameter than that and protruding from one end of the large-diameter portion and having an annular engagement groove on the outer periphery, and an axis line from the outer end of the small-diameter portion. A steel sleeve body has a bottomed hole drilled along the radial direction into which a steel core wire can be inserted, and the other end of the large diameter portion can be held in place, and a screw hole is screwed into the screw hole drilled in the radial direction in the large diameter portion of the main body. A push screw is embedded and capable of locking the inserted steel core wire at its tip, and an engagement edge capable of engaging with the retaining groove of the main body is provided on the inner surface between the end of the aluminum ascending wire and the end of the large diameter part of the main body. A multi-trough-shaped steel sleeve piece that can grip steel core wires, has an annular groove for binding wires on the outer periphery, and can form a cylinder with an outer diameter approximately equal to that of the steel core aluminum stranded wires by binding with attached bind wires, and a steel core. A clamping device for steel-core aluminum stranded wire, which is composed of an aluminum stranded wire, an aluminum sleeve that is fitted across the steel sleeve piece and the main body, and can be crimped to each. 2. A steel core aluminum stranded wire clamping device according to claim 1, wherein a handle is provided at the other end of the large diameter portion of the main body. 3. A steel-core aluminum stranded wire according to claim 1, wherein the main body is formed laterally symmetrically, the set screw and the steel sleeve pieces are also provided laterally symmetrically, and the main body is located in the center of the aluminum sleeve. clamping device.