JPH0453146Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improved structure of a clamp used as a tool for bypassing utility poles when wiring electric wires.

[Conventional technology]

Conventional clamps for tightening electric wires of this kind are known, for example, as described in Japanese Utility Model Publication No. 57-31619, and clamps made of synthetic resin are also known.

[The problem that the idea attempts to solve]

However, such clamps made of synthetic resin may deteriorate due to being exposed to the atmosphere all day at the top of a telephone pole during use, and have some drawbacks in terms of durability. Further, although such clamps are often reused for wiring renewal work, etc., there is a problem in that old clamps cannot be reused.

However, in conventional clamps of this type, no reinforcement against aging, especially reinforcement by physical means, has been found.

Therefore, an object of the present invention is to provide a clamp that solves all the conventional problems by inserting a reinforcing core material when molding the clamp.

[The problem that the idea attempts to solve]

The clamp for tightening electric wires of the present invention includes an elliptical ring part embedded in the fixed shaft part of the clamp, a straight rod part embedded in the central horizontal plate of the clamp body, and a pair of vertically symmetrical shapes at the end of the clamp body. A reinforcing core material consisting of a fork-shaped part embedded in the wire winding shaft part is formed, and the reinforcing core material is inserted into a synthetic resin during molding of the clamp and formed integrally.

[Effect]

The reinforcing core material buried in the center along the longitudinal direction of the clamp has the effect of reinforcing the entire longitudinal direction of the clamp, especially the fixed shaft part that supports against the pulling of the mounting bracket and the part that is supported by winding. The wire winding shaft portion at the end of the clamp body, etc., which is strongly subjected to the tensile force of the wire, is sufficiently reinforced.

[Example] An example of the present invention will be described below with reference to the drawings. The clamp body 1 has a plurality of pairs of wire winding shaft parts 3, 3, 4, 4 and 5, 5 protruding from two rectangular central horizontal plates 2, 2, which are positioned symmetrically above and below, respectively. , each pair of these wire winding shaft portions is provided with flaws 6, 6, 7, 7 and 8, 8 in opposite directions to form wire winding shaft portions 3, 3, 4, 4 and 5, 5. Wire winding grooves 9, 9, 10, 10 and 1
1 and 11 are formed. Reference numeral 12 denotes a fixed shaft portion protruding from one side of the clamp body 1, and a threaded portion 13 is provided on the circumferential surface of the fixed shaft portion, and both upper and lower surfaces of the threaded portion 13 near the wire winding shaft portions 3, 3 are flattened. The fixed shaft portion 12 is cut out to form notches 14, 14, and a through hole 16 for inserting the mounting fitting 15 is horizontally bored in the fixed shaft portion 12. Reference numeral 17 designates a tightening nut that is screwed into the threaded portion 13, and has an outer diameter that can penetrate between the flaws 6, 6 of the wire winding shaft portions 3, 3, and has a circumferential surface on the tightening surface. Wave-shaped uneven surface 18 at regular intervals in the direction
are installed consecutively.

As shown in FIG. When the electric wire A is brought into close contact with the wire A and tightened with the tightening nut 17, the electric wire A is fixed in a state where it is caught in the gap between the convex part of the corrugated uneven surface 18 and the notch part 14, as shown in Fig. 6. . Reference numeral 19 denotes a reinforcing core material that is inserted into the resin and integrally molded when molding the clamp. This reinforcing core material 19 includes an elliptical ring part 20 embedded in the fixed shaft part 12 so as to straddle the through hole 16;
Straight rod part 2 buried in the center between the central horizontal plates 2, 2
1 and a forked part 22 buried above and below the wire winding shaft parts 5, 5 at the end, and is made of general structural rolled steel material No. SS34 with a wire diameter of 3.2 m/m. Then, the surface is galvanized and folded into two, first forming an elliptical ring part 20, then aligning the wire rods to form a straight rod part 21, and aligning the wire rods at the end of the straight rod part 21. Fold each book vertically at right angles,
A bifurcated portion 22 having an opening angle of approximately 120° is formed, and reinforcing wire rods 23 having an opening angle of approximately 120° are arranged in parallel to the bifurcated portion 22, and the reinforcing wires 23 are joined together by spot welding.
Further, the straight rod portion 21 is also spot welded at appropriate locations to join the two wire rods together. Note that 24 is a fixture for attaching and fixing the reinforcing core material 19 to a mold (not shown), and is formed using the same resin as the clamp.

The reinforcing core material 19 formed in this way is attached to a mold and fixed with the fixing tool 24, and insert molding is performed by compression molding or the like to form a third mold.
A clamp with a reinforcing core material as shown in FIG. 4 is obtained.

In the clamp of the present invention in which the reinforcing core material 19 is inserted in this way, the reinforcing effect of the reinforcing core material 19 extends to the entire clamp, and in particular, the base of the fixed shaft portion 12 which is subjected to strong traction force during use, and the neck breakage. ,
The wire winding shaft portions 5, 5, which are susceptible to shocks such as twisting of the wire A at the terminal end of the clamp body 1, also exhibit sufficient reinforcing force and will not be damaged.

[Effect of idea]

As described above, the electric wire tightening clamp of the present invention is reinforced in the entire longitudinal direction under tension by the reinforcing core material inserted into the resin, and maintains strength sufficient to withstand weather deterioration. Furthermore, this clamp prevents damage to the entire fixed shaft, which is susceptible to localized large loads, as well as bending of the neck at its base, as well as damage to the entire wire winding shaft at the end of the clamp body.
This has the advantage of being able to provide a synthetic resin clamp that can withstand reuse.

[Brief explanation of drawings]

The figures relate to one embodiment of the present invention, and Fig. 1 is a perspective view, Fig. 2 is a perspective view of a reinforcing core material, Fig. 3 is a longitudinal sectional view of Fig. 1, and Fig. 4 is a longitudinal sectional view of Fig. 1. A cross-sectional view, FIG. 5 is a plan view showing a state in which the electric wire is wound up, and FIG. 6 is a side view showing a main part of FIG. 5 in cross section. 1... Clamp body, 2, 2... Central horizontal plate,
3, 3, 4, 4, 5, 5...Electric wire winding shaft portion, 12
... Fixed shaft part, 15 ... Mounting bracket, 16 ... Through hole, 17 ... Tightening nut, 19 ... Reinforcement core material, 2
0...Elliptical ring part, 21... Straight rod part, 22... Forked part, A... Electric wire.

Claims (1)

[Scope of utility model registration request] A fixed shaft part into which a tightening nut is screwed is provided on one side of the clamp body, which has a plurality of wire winding shaft parts projecting from each other at symmetrical positions on the upper and lower surfaces of the central horizontal plate. The clamp for tightening electric wires is made of synthetic resin and has a through hole drilled in the fixed shaft portion through which a mounting fitting is inserted, and includes an elliptical ring portion buried in the fixed shaft portion and a straight ring portion buried in the central horizontal plate. The stem and
A reinforcing core material consisting of a fork-shaped part embedded in a pair of vertically symmetrical electric wire winding shaft parts at the end of the clamp body is formed, and the reinforcing core material is inserted into a synthetic resin when molding the clamp. A clamp for tightening electric wires, characterized in that it is integrally formed.