JPH01107610A - Anchor clamp - Google Patents

Abstract

PURPOSE:To improve anchoring force by a core metal, which has a helical groove winding an electric wire to be mounted to the periphery and an anchor part in the rear end part, and by a sleeve forced to be press mounted to the periphery of said core metal. CONSTITUTION:A core metal 1 has a helical groove 3 for mounting an electric wire to the periphery, and the core metal 1, forming in its rear end part an anchor part 4 to a steel tower further being split longitudinally into two parts, can be separated into half pieces 1A, 1B. And positioning the half pieces 1A, 1B by a protrusion and a recessed part formed in a position where a butt face of the half pieces 1A, 1B is opposed facing to each other, allow the core metal 1 to be integrally formed. Then the core metal 1, after it mounts the electric wire to be wound, mounts a sleeve base unit 2A further connects a base unit 2B sliding to the base unit 2A, and a sleeve 2 is arranged in the periphery of the core metal 1. And compressing the sleeve 2 by a compression die allows the core metal 1 and the electric wire to be tightened from the periphery. Thus, because it is required to only compress the aluminum-made sleeve 2, work efficiency improves. On the other hand the core metal 1, being tightened by the electric wire with its tension, enables anchoring force to be increased.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a retaining clamp for retaining electric wires such as overhead power transmission lines and overhead ground wires to a steel tower, and particularly relates to a retaining clamp for retaining electric wires such as overhead power transmission lines and overhead ground wires to a steel tower, and particularly to a pull-through type clamp that can retain electric wires without cutting them. This relates to a retaining clamp.

[Prior art and its problems]

For example, when securing an overhead ground wire containing optical fiber to a steel tower, cutting the overhead ground wire at the point where the retaining clamp is attached will make handling the optical fiber troublesome, so in such cases, a pull-through type retaining clamp is recommended. It is preferable to use

Conventionally, there are pull-through type retaining clamps that have a structure in which the electric wire is held between clamp pieces and tightened with bolts and nuts, but this has the disadvantage that the retaining force is weaker than compression type clamps.

Recently, a type of retaining clamp has been proposed in which a spiral steel clamp piece is wrapped around an electric wire and compressed, and a spiral aluminum clamp piece is wrapped around the wire and compressed (Japanese Patent Laid-Open No. 109412/1983). ), but this retaining clamp compresses the spiral clamp piece wrapped around the wire, so the compressive force acts effectively and the electric wire (,
In order to have the same performance as a compression type retaining clamp, it would have to be extremely long, which has the drawback of poor handling and workability.

[Means for solving problems and their effects]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compression-type, retractable-type retaining clamp that solves the problems of the prior art as described above.

To achieve this objective, the present invention provides a retaining clamp that
It is composed of a mandrel having a helical groove around the outer periphery of which the fm is wound and attached, and a retaining part at the rear end, and a sleeve which is crimped onto the outer periphery of the mandrel. In this way, the wire is wound spirally around the mandrel, and force is applied from the outer periphery of the wire to tighten it with the sleeve, thereby greatly increasing the retaining force. However, the core of this retaining clamp has a complicated shape with a spiral groove on the outer periphery, so it has to be manufactured by cutting from a bar or by the lost wax method, which poses the problem of extremely high costs. . Therefore, the present invention further provides a structure in which the mandrel is vertically divided into two parts, so that it can be manufactured in a continuous manner by forging or the like.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and this retaining member is composed of a mandrel 1 and a sleeve 2. As shown in FIG.

The mandrel 1 has a spiral groove 3 formed on its outer periphery for attaching the electric wire, and a retaining part 4 for attaching to the steel tower formed at the rear end.
Made of high strength materials such as steel or aluminum alloy.

Moreover, the mandrel 1 is vertically divided into two halves, so that it can be separated into two halves IA and IB as shown in FIG. A protrusion 5 is formed on the negative side and a recess 6 is formed on the other side at opposing positions of the mating surfaces of the two halves LA-IB,
Two half pieces IA and 2 are attached so that the protrusion 5 and the recess 6 fit together.
When the IBs are aligned, the spiral groove 3 becomes continuous as shown in FIG. The positioning of the two halves LA and IB is as follows:
It is also possible to drill holes through both and fasten them with screws.

The tip and rear ends of the helix a3 are gently connected to a straight groove 7.8 for drawing out the electric wire. It is preferable that the depth of the helical groove 3 is slightly shallower than the outer diameter of the wire, that is, to the extent that a portion of the wire protrudes from the groove when the wire is attached.Also, experiments have shown that the pinch of the helical groove 3 is caused by the outside diameter of the wire. The diameter should be at least 10 times, preferably around 20 times,
In addition, the pinch of the helix 1lI3 may be a pinch of the entire length, but the pitch may also be gradually changed.Also, roughening the inner surface of the helical groove 3 or pasting a friction member on the inner surface may be used in the retaining direction. It has an effect on the top.

On the other hand, the sleeve 2 is an aluminum compression sleeve, and as shown in FIG. The inner diameter of the sleeve 2 is slightly larger than the outer diameter of the mandrel 1.

Figure 3 shows the state in which the wire is held in place by the above-mentioned holding clamp.
・The core metal 1 is formed by combining the IBs as shown in FIG. The lid 2B is slidably connected to the metal core 2A, and the sleeve 2 is placed around the outer periphery of the core metal 1.The electric wire 9 is thereby restrained in a spiral shape.After that, the sleeve 2 is compressed using an ordinary compression die. By tightening the mandrel 1 and the electric wire 9 from the outer periphery, installation of the retaining clamp is completed.

Unlike conventional compression-type retaining clamps, this retaining clamp does not require compression of the steel clamp, but only requires compression of the aluminum sleeve, so installation is extremely simple. In addition to the force of the sleeve 2 pressing the wire 9 against the mandrel 1, the tension of the wire 9 generates the force of the wire 9 tightening the mandrel 1, so the frictional force between the wire 9 and the mandrel becomes extremely large and strong. Provides a holding power.

〔Effect of the invention〕

As explained above, the retaining clamp according to the present invention has a structure in which the electric wire is spirally wound around the mandrel and the sleeve is crimped on the outer periphery of the electric wire, so that the friction between the electric wire, the mandrel and the sleeve is The force is extremely large, and even though it is a pull-through type, it can obtain a large retaining force. In addition, the core metal has a complex shape with a spiral groove on the outer periphery, but since it is split into two vertically, each half piece can be easily manufactured by die forming such as forging, making it highly suitable for mass production. , which has the advantage of being inexpensive to manufacture.

[Brief explanation of the drawing]

Fig. 1 shows a retaining clamp according to an embodiment of the present invention, where fat is a plan view of the mandrel, crest) is a front view of the sleeve, (C1 is a right side view of the sleeve, and Fig. 2 is the above). FIG. 3 is a partially cutaway front view showing the state in which the wire is held in place by the above-mentioned retaining clamp. 1 - mandrel, IA/IB - half piece, 2 ~ Sleeve, 3 ~ Spiral finish, 4 ~ Retaining part, 9 ~ Electric wire. Figure 1

Claims (1)

[Claims] A mandrel that has a helical groove on its outer periphery for attaching an electric wire, a retaining part at the rear end, and is split into two vertically; A retaining clamp characterized by comprising a sleeve that is crimped while the is attached.