JP3316358B2 - Insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator used for retaining a relatively low voltage electric wire such as a distribution wire on a support.

[0002]

2. Description of the Related Art Insulators used to hold relatively low-voltage electric wires such as distribution wires to supports need to be manufactured at low cost because of the large number of insulators used. As such an insulator, an insulator as shown in FIGS. 9 and 10 has been proposed. The insulator comprises a substantially egg-shaped insulator 1, a retainer 2 disposed on both sides of the insulator 1, and the insulator 1.
And an insulator main body 3 molded at a portion of the end fitting 2 excluding the tip side.

[0003] The insulator 1 is made of a material having high mechanical strength such as porcelain or FRP, the retainer 2 is made of a material such as steel, and the insulator body 3 is made of a material such as porcelain clay or silicone rubber. Made of.

[0004] The retaining bracket 2 is formed by bending a band-like metal such as steel into a substantially U-shape, and is displaced by 90 degrees from each other and is locked to the insulator 1 so as to hold the insulator 1. . Therefore, when a tensile load is applied to the anchor 2, a compressive load is applied to the insulator 1.

In order to manufacture the insulator having the above structure, as shown in FIGS. 9 and 10, the holding fitting 2 is locked to the insulator 1 while holding the insulator 1 and shifting the mounting position by 90 degrees. In this state, the portion excluding the insulator and the tip of the retaining fitting 2 is set in the mold 5. Next, porcelain clay, silicone rubber, or the like is injected into the mold die 5, and then the mold die 5 is removed. Finally, the insulator body is formed by drying, sintering, or vulcanizing to manufacture an insulator.

[0006]

However, in the insulator having the above-described structure, the holding metal members 2 formed by bending a band-shaped metal into a substantially U-shape are engaged with the insulator 1 at positions shifted from each other by 90 degrees. However, there is a problem that four molds are required.

That is, reference numeral 6.7 in FIG. 9 and FIG.
Reference numeral 6.8 is a split surface of the mold, and the left half shown in FIG. 9 is a mold die that can be split up and down.
The right half shown in FIG. 9 is a mold die that can be split back and forth with respect to the paper surface (up and down in the right half shown in FIG. 10).

As described above, in the conventional insulator, the holding metal members 2 formed by bending a band-like metal into a substantially U-shape are attached to each other by 90 degrees.
In this structure, four mold dies are required because the structure is locked to the insulator 1 at a shifted position, which increases the cost of the mold dies and complicates the mechanical equipment for tightening the mold dies. There was a problem of becoming.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has the following features. An insulator, a buckle disposed on both sides of the insulator, the insulator and the buckle are provided. In one embodiment, one of the end fittings has a rod-like shape, one end of which is penetrated by an insulator and is locked to the insulator. The other of the metal fittings is substantially U-shaped and is characterized in that it holds the insulator and is locked to the insulator.

One end of the end fitting is formed in a rod shape, and one end of the end fitting is penetrated by an insulator to be engaged with the insulator, and the other end of the end fitting is formed into a substantially U-shape to hold the insulator and engage with the insulator. By stopping, the insulator main body can be manufactured using a split mold. For this reason, an insulator can be manufactured at a lower cost than before.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1 shows one of the fasteners 10 used in the present invention.
Reference numeral 0 denotes a bar formed of steel or the like, and a recess 11
And the other end is rounded to form the
3 are formed. Reference numeral 14 denotes a weld.

[0012] As shown in FIG.
One end where the concave portion 11 is formed penetrates the insulator 20, and the locking metal fitting 1 is provided in the concave portion 11 penetrating the insulator 20.
5 is fixed. As a result, one of the retention fittings 10
When the retention hole 13 is pulled in the direction of arrow A,
Is locked to the insulator 20, so that one of the retention fittings 10 does not come off from the insulator. The insulator 20 is made of a material having high mechanical strength, such as porcelain or FRP. Reference numeral 21 denotes a protrusion, and reference numeral 22 denotes a shoulder.

FIG. 3 shows another end fitting 30 used in the present invention. The end fitting 30 is formed of a metal such as a belt-like steel, and has a protrusion 2 of an insulator 20 at a center in the longitudinal direction.
A diamond-shaped locking portion 32 having a hole 31 from which 1 protrudes is formed, and retention holes 33 are formed at both ends. As shown in FIG. 4, the other retaining bracket 30 is formed by bending a diamond-shaped locking portion 32 at a central portion in the longitudinal direction to have a substantially U-shape.

This is locked to the insulator 20 as shown in FIGS. That is, the protrusion 21 of the insulator 20
Is projected from the hole 31 and the shoulder 2
The locking portion 32 is locked to the insulator 2 to hold the insulator 20, thereby locking the other retainer 30 to the insulator 20.

As described above, after the one fastener 10 and the other fastener 30 are arranged on both sides of the insulator 20, they are set in the mold 40 as shown in FIG. The mold 40 is divided into two. 41
Is the split. Porcelain clay, silicone rubber, or the like is injected into the insulator body forming gap 42 formed in the mold 40, and then the mold 40 is removed. Finally, drying, sintering, or vulcanization is performed. As shown in FIG. 8, the insulator main body 51 is formed to manufacture the insulator 50.

The means for locking one of the rod-shaped retaining members 10 used in the present invention to the insulator, the shape of the insulator 20, and the shape of the insulator body 51 are not particularly limited.

[0017]

As described above, in the insulator according to the present invention, one of the retainers is formed in a rod shape.
A split mold can be used as the mold. For this reason, the mold is inexpensive, and the mechanical equipment for tightening the mold is simple in structure, so that an insulator that is even cheaper than before can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of one end fitting used in the present invention.

FIG. 2 is an explanatory view of a state in which one of the end fittings penetrates an insulator.

FIG. 3 is a developed plan view of the other end fitting used in the present invention.

FIG. 4 is a perspective view showing a state where the other retaining metal member of FIG. 3 is bent in a U-shape.

FIG. 5 is a front view showing a state in which one of the fasteners and the other fastener are locked to an insulator.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is an explanatory diagram of a state where an insulator is set in a mold.

FIG. 8 shows a completed insulator according to the present invention.

FIG. 9 is a front view showing a manufacturing state of a conventional insulator.

FIG. 10 is a side view of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 One of the metal fittings 20 Insulator 30 The other metal fitting 40 Mold mold 50 Insulator

Claims (1)

(57) [Claims] 1. An insulator comprising: an insulator; a retainer disposed on both sides of the insulator; and an insulator main body molded at a portion excluding a tip portion of the insulator and the retainer. One of them is rod-shaped, and one end side penetrates the insulator and is locked to the insulator, and the other of the holding brackets is substantially U-shaped and holds the insulator and is locked to the insulator. An insulator characterized by being made.