JP3222791B2 - Wheel passing type clamping 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 retention clamp for retaining an electric wire and connecting it to a wire in a wire drawing work of a transmission line such as a transmission line made of a steel core aluminum stranded wire, and more particularly, to an aluminum element when passing through a wheel. This is to prevent breakage of the wire.

[0002]

2. Description of the Related Art A conventional retaining clamp has a steel sleeve and an aluminum sleeve. One end of the steel sleeve has a handle, and the portion excluding the handle is compression-fixed on the outer periphery of the steel core wire at the end of the electric wire made of steel core aluminum stranded wire.
The aluminum sleeve is compression-fixed from the steel sleeve over the outer periphery of the aluminum wire portion at the end of the electric wire. This retaining clamp is formed so that the tip of the steel sleeve inserted into the aluminum sleeve exceeds the center of the total length of the retaining clamp to prevent plastic deformation due to the bending moment applied to the aluminum sleeve when passing through a wheel in wire drawing work. (Japanese Unexamined Patent Publication
-51709).

[0003]

In the above-described conventional clamp, the electric wire is bent more than the bend of the aluminum sleeve when passing through the wheel in the wire drawing work. The wire may be damaged. Accordingly, an object of the present invention is to protect an aluminum wire from contact with an aluminum clamp when passing through a wheel.

[0004]

In the present invention, in order to solve the above-mentioned problems, an electric wire E made of a steel core aluminum stranded wire is used.
The steel clamp 2 is compression-fixed on the outer periphery of the steel core wire at the end of the wire, and the end of the electric wire E is inserted into the aluminum sleeve 3 together with the steel sleeve 2 to compress and fix the aluminum sleeve 3 on the outer periphery of the aluminum wire. , The diameter of the wire insertion hole at the wire insertion side end of the aluminum sleeve 3 is increased toward the distal end, and an inner tapered portion 3e that is not compressed when fixed is provided. E
An annular elastic buffering member 4 for reducing the bending of the electric wire E interposed between them was mounted to constitute a pulley passing type retaining clamp.

[0005] Further, an axial split 4c is provided in the cushioning member 4 so that the diameter can be reduced, and the cushioning member 4 projects outside the aluminum sleeve 3 when mounted on the aluminum sleeve 3.

[0006]

Embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the retaining clamp 1 includes a steel sleeve 2, an aluminum sleeve 3, and a cushioning member 4. As shown in FIG. 2, the steel sleeve 2 has a substantially cylindrical shape, and a pull 2a is provided at one end. At the center of the steel sleeve 2 is formed a steel core wire compression part 2b into which the steel core wire of the electric wire E is inserted and crimped. A stepped portion 2c is formed adjacent to the steel core wire compression portion 2b. The other end of the steel sleeve 2 has an extension 2d that receives the aluminum stranded wire and extends by the compression of the steel core wire compression unit 2b.

The aluminum sleeve 3 is, as shown in FIG.
It has a substantially cylindrical shape. On one end side of the aluminum sleeve 3, a jumper portion 3a having a connection hole for connecting a jumper socket and in which the steel core compression portion 2b of the steel sleeve 2 is disposed is formed. An extended portion 2d of the steel sleeve 2 is disposed in the middle of the aluminum sleeve 3, and a cylindrical portion 3b for compressing and fixing the aluminum wire together with the steel sleeve 2 is formed. The other end of the aluminum sleeve 3 is formed with a tapered tapered portion 3c. Aluminum sleeve 3
The tapered portion 3c has a non-compressed portion 3d from the substantially middle portion to the distal end side. That is, the compression of the tapered portion 3c is performed on the portion excluding the non-compressed portion 3d. This uncompressed part 3
In the electric wire insertion hole d, an outer peripheral inner taper 3e whose inner diameter increases toward the distal end is formed. The inner end of the steel sleeve 2 in the aluminum sleeve 3 has a length appropriately exceeding the center of the retaining clamp 1,
The steel sleeve 2 is supported when the bending moment acting when passing through the wheel and wheel is maximum.

The elastic cushioning member 4 is made of an elastic synthetic resin material having a substantially cylindrical shape so that an electric wire can be inserted. As shown in FIGS. 4 and 5, a corresponding tapered portion 4 a that fits into the inner peripheral tapered portion 3 e of the aluminum sleeve 3 is formed at one end of the elastic buffering member 4. On the other end side of the elastic cushioning member 4,
It has a cylindrical portion 4b that protrudes outward from the tip of the aluminum sleeve 3 when mounted on the aluminum sleeve 3. Further, the elastic buffer member 4 is provided with an axial split 4c over the entire length, whereby the diameter can be elastically reduced.

In the clamp 1 according to the present embodiment, a steel core wire at the end of an electric wire is inserted into a steel sleeve 2 and fixed by compression, and then inserted into an aluminum sleeve 3 to compress and fix the aluminum wire portion.
Then, the cushioning member 4 is attached to the electric wire and the aluminum sleeve 3
, And a rubber tube (not shown) is wound around the electric wire from the tapered portion 3c of the aluminum sleeve 3. When the wire is pulled and passed through the wheel in the wire drawing work, the wire clamp portion of the retaining clamp 1 is bent at the opening edge of the aluminum sleeve 3, but the bending angle is reduced by the elastic buffer member 4. At the same time, there is no direct contact with the opening edge, so that damage to the electric wire is avoided. Also,
When the wire is bent when the retaining clamp 1 passes through the wheel, a force for pushing the buffer member 4 inward of the aluminum sleeve 3 acts between the inner peripheral taper 3 e in the tapered portion 3 c and the corresponding tapered portion 4 a of the buffer member 4. , Is securely held and does not fall off.
In order to prevent the buffer member 4 from deteriorating and dropping after the wire is drawn, the cylindrical portion 4 is formed so as to narrow the split 4e of the buffer member 4.
b can be easily removed by compressing and narrowing.

[0010]

As described above, according to the present invention, the steel sleeve 2 is compression-fixed on the outer periphery of the steel core wire at the end of the electric wire E made of steel core aluminum stranded wire, and the end of the electric wire E is fixed to the aluminum sleeve 3. Part of the aluminum sleeve 3 is compressed and fixed to the outer periphery of the aluminum wire by inserting the aluminum sleeve 3 into the outer periphery of the aluminum wire. In addition, an inner peripheral taper portion 3e which is not compressed at the time of fixing is provided, and the inner peripheral taper portion 3e of the aluminum sleeve is interposed between the electric wire E and the electric wire E.
Since the ring-shaped elastic buffering member 4 for reducing the bending of the wheel is attached to form the pulley passing type retaining clamp, the buffering member is interposed between the opening edge of the aluminum clamp and the electric wire when the wheel passing in the wire drawing work. This has the effect that the aluminum element wire can be protected by this. In addition, the buffer member 4 is provided with an axial split 4c so that the diameter can be reduced and the buffer member 4 is configured to protrude outside the aluminum sleeve 3 when mounted on the aluminum sleeve 3, so that the work of attaching and detaching the buffer member can be easily performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a front view of a wheel-passing type retaining clamp according to the present invention.

FIG. 2 is a front view of a steel sleeve.

FIG. 3 is a front view of the aluminum sleeve.

FIG. 4 is a perspective view of a cushioning member.

FIG. 5 is a partial vertical cross-sectional view of the pulley passing type retaining clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retention clamp 2 Steel sleeve 3 Aluminum sleeve 3b Cylindrical part 3c Taper part 3d Non-compression part 3e Inner peripheral taper 4 Buffer member 4a Corresponding taper part 4c

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Junichi Shibasaki 6-5-19 Minamishinagawa, Shinagawa-ku, Tokyo Sanwa Tekki Co., Ltd. (56) Reference JP-A-8-51709 (JP, A) JP Hei 8-223750 (JP, A) Fully open 1986-41320 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 7/02 H02G 1/02

Claims (2)

(57) [Claims] 1. A steel sleeve compression-fixed on an outer periphery of a steel core wire at an end of an electric wire made of a steel core aluminum stranded wire, and an end of the electric wire inserted together with the steel sleeve to be compression-fixed on an outer periphery of the aluminum wire. In the retention clamp provided with an aluminum sleeve, a wire insertion side end of the aluminum sleeve includes:
The diameter of the wire insertion hole increases toward the distal end, and an inner tapered portion that is not compressed when fixed is formed.The inner tapered portion of the aluminum sleeve is interposed between the wire and the wire to bend the wire. A pulley passing type retaining clamp, wherein an annular elastic buffer member to be relaxed is detachably mounted. 2. The cushioning member according to claim 1, wherein the cushioning member has a split in an axial direction and can be reduced in diameter, and one end of the cushioning member projects outside the aluminum sleeve when the cushioning member is mounted on the aluminum sleeve. The described wheel-passing type clamping clamp.