JPH08140252A - Protectorless anchor clamp - Google Patents

Abstract

PURPOSE: To reduce the whole length sharply and to cause a metal wheel to pass without a protector. CONSTITUTION: An electric wire W and a steel clamp 2 can be inserted into an aluminum clamp 1 facing each other. A circular hole 2a is provided at the end section of the steel clamp, and into this the receiving cylinder 3a of an anchor device 3 and a wedge 4 are inserted. The receiving cylinder 3a is screwed into the circular hole 2a and joined, and a conical hole is provided at the center. The wedge 4 has a center hole, and its outside is in the shape of a cone. Concerning to the end section of a steel core wire (w), its center line is put into the center hole of the wedge 4, and the others are arranged into the shape of an umbrella between the inclined surface of the receiving cylinder 3a and the wedge. A jumper socket has a structure fittable without boring through holes in the aluminum clamp 1 and the steel clamp 2, and a jumper socket fitting section is eliminated from the whole length of an aluminum clamp heretofore in use.

Description

Detailed Description of the Invention

[0001]

[Industrial application] In the wire drawing work in the prefabricated construction method, a protector is attached to the detent clamp to prevent damage when passing through the gold wheel, but the present invention allows the gold wire to pass without obstacles without a protector. The present invention relates to a retaining clamp.

[0002]

2. Description of the Related Art Several invention inventions have been made with respect to a detent clamp of a gold wheel passing type, but most of them are premised on the use of a protector for passing the money wheel. FIG. 4 is also an example thereof, which is shown in Japanese Utility Model Publication 58-7797.

The protector covers the entire length of the clamp and is used by being integrally connected. However, the protector must be attached in the process before passing through the gold wheel and removed after passing through. In addition to the protector itself being expensive, it is a work that cannot be easily installed and removed at high places. It has always been a dream of the people involved to pass a gold car without a protector.

[0004]

[Means for Solving the Problems] The conventional retaining clamp has a total length of about 1 m. With this length, it is difficult to cope with bending stress when passing through the gold wheel, which is the reason why a protector is required. The only way to make it protectorless is to dramatically reduce the total length of the retaining clamp. When the aluminum clamp of FIG. 4 is viewed from this point of view, a considerable portion of the entire length L is the crimping portion A of the steel core wire by the steel clamp and the through bolt hole portion B for mounting the jumper socket. The following means are applied to these two. The length A is changed to an umbrella-like retaining structure using a conical wedge in the steel clamp part. Further, the length B is changed so that the jumper socket can be mounted on the aluminum clamp after being compressed without forming a through hole in the aluminum clamp.
The length of the aluminum clamp including the length AB is crimped and the length is significantly shortened.

The one whose overall length is shortened as described above is
Experience shows that the current carrying capacity does not cause any problems. Although it is feared that the mechanical strength will be reduced, the retaining device 3 can be used in combination with the entire surface crimping of the aluminum clamp and the wedge retaining structure of the steel core wire to obtain sufficient tensile strength.

[0006]

EXAMPLE Referring to FIG. The aluminum clamp 1 can insert the electric wire W and the steel clamp 2. The electric wire W is a steel core aluminum stranded wire, and the aluminum stranded wire at the end is cut off to make a steel core wire w.
Is projected. The steel clamp 2 has a circular hole portion 2a at its inner end, to which the crimping uneven portion 2b and the pull tab 2c are connected. The retaining device 3 can screw the receiving cylinder 3a into the circular hole 2a,
A conical hole having a large diameter on the pull tab 2c side is bored. The wedge 4 has a through hole centered on the slope corresponding to the conical hole. The projecting steel core wire w has its center line inserted into the center hole of the wedge, and the others are pushed out and arranged in an umbrella shape on the conical surface of the wedge. In the embodiment, the jumper socket 5 is composed of a branch portion 5a into which two parallel sides of an aluminum clamp which is hexagonal by compression as shown in FIGS. 2 and 3 can be inserted, and a compression pipe portion 5b, and the branch portion is tightened with a bolt. It is possible.

[0007]

As described above, the receiving tube 3a of the retaining device 3 in which the wire of the steel core wire w is sandwiched by the wedge 4 is used as the circular hole 2a of the steel clamp.
The receiving cylinder 3a is fully retracted to the back of the circular hole.
Pull the aluminum clamp 1 that has been previously inserted into the wire W with the puller 2
Slide it to the position where it abuts c and crimp the entire length. The wedge firmly holds the steel core wire against the pulling force of the wire.
Due to the conversion to the retaining structure and the elimination of the mounting hole B in FIG. 4, the total length of the retaining clamp is reduced to nearly half that of the conventional one, so that the gold wheel can be safely overridden without a protector. The jumper socket 5 is attached to the aluminum clamp after passing the gold wheel.

In the embodiment, the compression shape of the aluminum clamp is hexagonal in cross section, but it is not limited to this and other polygonal shape or round cross section may be used. Further, the jumper socket may be attached with any engaging structure as long as the branch portion can secure a sufficient current-carrying capacity from the compression portion of the aluminum clamp.

[0009]

[Effect] Since the total length can be halved compared to the conventional detent clamp, there is no hindrance to the passing of the gold wheel without a protector. By the retaining device 3, it is possible to combine the entire surface of the aluminum clamp with the wedge retaining structure of the steel core wire, and obtain sufficient tensile strength for retaining the transmission line.

[Brief description of drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a front view of a jumper socket.

FIG. 3 is a side view of the same.

FIG. 4 is a front view of a conventional detent clamp.

[Explanation of symbols]

 1 Aluminum Clamp 2 Steel Clamp 2a Circular Hole 2b Concavo-convex 2c Puller 3 Stopper 3a Receptacle 4 Wedge 5 Jumper Socket 6 Bolt W Steel Core Aluminum Stranded Wire w Steel Core Wire

Claims (2)

[Claims] 1. An aluminum clamp into which a steel core aluminum stranded wire can be inserted from one end and a steel clamp can be inserted from the other end, and a steel clamp in which one end has a circular hole portion and a crimping uneven portion and a puller are connected thereto, Consists of a cylinder and a wedge, the receiving cylinder is screwed into the circular hole of the steel clamp and has a conical hole with a large diameter on the pulling side. The wedge has a conical center through hole corresponding to this conical hole. It is assumed that the center line of the steel core wire end is inserted into the center hole of the wedge and the other line can be arranged like an umbrella on the surface of the wedge, and one end can be attached to the compression part of the aluminum clamp. A protector-less detent clamp composed of a jumper socket with a branch part and a jumper wire connection part at the other end 2. The protector-less detent clamp according to claim 1, wherein the compression shape of the aluminum clamp is hexagonal in cross section, and one end of the jumper socket engaging with the clamp has cross section 6 in cross section.
It is a branch that can be inserted into two parallel sides of a square type, and the branch can be tightened with through bolts above and below it.