JPH0242406Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a holder for embedding a scaffolding socket in a utility pole. It holds the scaffolding socket.

(Prior Art) Conventionally, in this type of holder, the crimping surface of the holding bolt and the stepped surface of the base were formed in a flat shape with respect to each other.

(Problems to be solved by the invention) Since the crimping surface of the conventional holding bolt and the stepped surface of the cap are flat, even if the surface accuracy of the crimping surface and the stepped surface is made precise, it is difficult to prevent dirt or utility poles from forming. Fresh concrete during molding adhered to the pressure bonding surface and the step surface, and a long-term sealing effect could not be obtained. Therefore, when molding concrete utility poles, cement and
When the shell is rotated after pouring ready-mixed concrete such as sand or water, the ready-mixed concrete scatters from the mouthpiece and adheres to the mouthpiece, shell, etc., making subsequent cleaning time-consuming. .

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention proposes a synthetic resin retaining bolt that is inserted into a base provided at an appropriate position of a columnar shell for molding a concrete utility pole. In this case, the crimping surface of the holding bolt corresponding to the flat stepped surface of the cap is tapered so that the outer periphery is higher than the inner periphery of the crimping surface.

(Function) First, when a holding bolt is inserted into the cap of the columnar shell of a concrete utility pole, the crimp surface of the holding bolt and the stepped surface of the cap come into line contact. That is,
The crimping surface of the holding bolt is tapered so that the outer periphery is higher than the inner periphery of the crimping surface, and the stepped surface of the cap is formed in a flat shape. Only the corner portion of the portion corresponding to the stepped surface (large diameter side of the stepped surface) is in line contact. Then, when the holding bolt is pressed toward the base by an appropriate means, the corner portions are pressed together in a substantially linear manner.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 4, a cap 1 is welded to a suitable position on a columnar shell (a concrete utility pole), into which a holding bolt 4 is inserted, and a large diameter portion 1 a. and small diameter portion 1b,
Inside, a large inner diameter portion 11a and a small inner diameter portion 11b are opened in a stepped manner, and the large diameter portion 1a is provided with a flange portion 1f. A stepped surface H is provided at the stepped portion between the large inner diameter portion 11a and the small inner diameter portion 11b.
is formed in a flat shape.

Reference numeral 2 denotes a locking ring formed in an annular shape, which fits into the large diameter portion 1a of the cap 1, and the base 3a of the locking elastic piece 3 is fitted into the opening 2a with a pin 3b.
At the same time, a U-shaped engaging portion 2b is bent on the opposite side of the opening 2a. Reference numeral 2c denotes an engaging opening at the lower edge of the engaging portion 2b, into which a hanging ring 3c rotatably supported near the tip of the engaging elastic piece 3 is engaged.

Furthermore, the engaging elastic piece 3 is formed into a substantially wave shape,
The top surface 4 of the retaining bolt 4 (described later) with this locking bullet piece 3
1a and prevents the holding bolt 4 from coming off.

The holding bolt 4 has a head 4a, a body 4b, and a shaft 4c with a threaded portion 41c, and is molded from a hard synthetic resin material, and the crimping surface 4d of the stepped portion between the head 4a and the body 4b is It is tapered. That is, the crimp surface 4d is tapered such that the outer circumference is higher than the inner circumference of the crimp surface 4d.

Therefore, only the corner portion of the tip of the crimp surface 4d (the outer periphery of the crimp surface 4d) and the portion of the step surface H of the cap 1 corresponding to the tip (large inner diameter portion 11a side) is in line contact, and the Due to the pressing force of the locking bullet 3, the corner portions are pressed together in a substantially linear manner.

A hexagonal spanner hole 4 is provided on the top surface 41a of the head 4a.
f is bored, and a circular metal fixing plate 5 is buried therein. This fixing plate 5 has a hexagonal hole 5a punched in the center, and around the hexagonal hole 5a, cut and raised claws 5b are provided at three locations at 120 degree intervals. It is stopped (see Figures 2 and 3). That is, the holding bolt 4 and the fixing plate 4 are integrally formed.

On the other hand, a known scaffolding socket S is screwed onto the threaded portion 41c of the shaft portion 4c.

Next, when the holding bolt 2 with the socket S screwed onto it is inserted into the cap 1 welded to the shell K, the tip of the crimping surface 2d of the holding bolt 2 will touch the large inner diameter of the stepped surface H of the cap 1. Line contact is made with the peripheral edge of the portion 11a side. Then, when the retaining bolt 4 is pressed in the direction of the shell K by the locking bullet 3, the tip of the crimp surface 2d is elastically deformed, and the large inner diameter portion 1 of the stepped surface H is
The tip of the pressure bonding surface 2d is pressed against the peripheral edge on the side 1a in a substantially linear manner. Next, cement the shell K,
After injecting ready-mixed concrete such as sand and water, the shell K is rotated to form a concrete utility pole, and after the ready-mixed concrete is solidified,
The locking bullet piece 3 is released and the holding bolt 4 is screwed back from the scaffolding socket S buried in the telephone pole and removed (see FIG. 4).

Note that the contact between the step surface H of the cap 1 and the crimping surface 4d of the holding bolt 4 may be formed in the shape of a labyrinth seal. In this case, even if the shape is slightly imperfect, fresh concrete is unlikely to leak to the outside.

(Effects of the invention) In the present invention, the crimping surface of the holding bolt is tapered so that the outer periphery is higher than the inner periphery of the crimping surface, and the stepped surface of the cap is formed in a flat shape. Since the corner part of the part corresponding to the tip and the step surface is in almost linear pressure contact, cleaning only this corner part will prevent dirt or fresh concrete from forming the utility pole from coming into contact with the pressure bonding surface and the step surface. Even if it adheres, a long-term sealing effect can be obtained only at the corner portion. That is, the scattering of fresh concrete from the base when molding a concrete utility pole is prevented, the ready-mixed concrete does not adhere to the base, the shell, etc., and the subsequent cleaning of the base, shell, etc. is not time consuming.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan cross-sectional view of the holder and the scaffolding socket, Fig. 2 is an enlarged plan view of the fixing plate, Fig. 3 is its front view, and Fig. 4 is a cross-sectional plan view of the holder and the scaffold socket. FIG. 1 is an exploded perspective view of FIG. 1...Cap, 4...Holding bolt, 4d...Crimp surface, H...Step surface, S...Scaffolding socket, K...
Shell body.

Claims (1)

[Scope of utility model registration request] In a holding bolt made of a synthetic resin material that is inserted into a cap provided at an appropriate location of a columnar shell for forming a concrete utility pole, the crimping surface of the holding bolt corresponding to the flat stepped surface of the cap is crimped. A holder for embedding a scaffolding socket in a utility pole, characterized in that the outer circumference of the surface is tapered to be higher than the inner circumference.