JPH0210170Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an insert bushing buried in concrete for screwing a hook bolt or the like onto a concrete surface.

Conventionally, such insert bushes have been made of metal members, so it is difficult to integrally form the locking parts for preventing slippage and rotation, which increases the cost, and also makes it difficult to form a locking part for preventing slippage and rotation. It has the disadvantage that it is difficult to embed and hold it accurately.

In view of these drawbacks, the present invention has a bush main body with a female screw formed therein that is integrally molded from synthetic resin, and a hook that protrudes outward is formed at the buried base end of the bush main body. In an insert bush in which a rib is formed protruding in the axial direction on the outer periphery of the body, and the outer wall of the insertion port is formed to extend forward in a thin and long shape to form a socket, from the buried base end. An attempt has been made to solve the above-mentioned drawbacks by providing an insert bushing in which a semi-circular groove with a diameter larger than the mouth edge is formed on the inner periphery of a cylindrical collar that protrudes toward the rear. An embodiment of the present invention will be described below based on the drawings. 1 is a bushing body made of synthetic resin such as acetal, copolymer, nylon, vinyl chloride, etc.; body 2 has an insertion opening 3 at one end; In addition to forming an opening, a female screw portion 4 is formed coaxially with the insertion port 3 inside.

Also, on the outer periphery of the body 2, a buried base end 5 is buried from a midway position.
A plurality of ribs 6, 6a...
are formed to protrude, and the ribs 6, 6a are formed in a tapered shape that becomes higher from the insertion port 3 side to the buried base end 5 side, thereby achieving a locking action in the rotation and tension directions.

7 is a hook part in the pulling direction, and the buried base end part 5
The flange 8 is formed by protruding in an enlarged diameter direction toward the outer circumferential direction, and by integrally bending the distal end toward the insertion port 3 .

In addition to the collar part 8, the hooking part 7 has a cylindrical collar ring 15 integrally projecting rearward from the buried base end part 5, and a cylindrical collar ring 15 is integrally provided on the inner peripheral part 16 of the collar ring 15 from the mouth edge part 17. A semi-circular groove 18 with a large diameter is provided around the circumference.

Further, the outer wall portion 9 of the insertion port 3 is formed to be thin and elongated to such an extent that the diameter of the insertion port 3 can be elastically expanded and contracted, so that the inner circumferential surface of the insertion port 3 forms a socket portion 10. A jig 14 having a protrusion 12 for fitting into the formwork 11 at one end and an engaging part 13 having a slightly larger diameter than the socket part 10 at the other end is attached to a bushing body made of synthetic resin. 1, and the jig 14 is elastically inserted into and removably inserted into the socket 10 of the bush main body 1.

Next, the usage state of the insert bush according to the present invention will be explained. A jig 14 is fitted into the formwork 11 through the projections 12 in advance in accordance with the buried position of the bush main body 1, and the jig 14 is When the socket part 10 of the bush main body 1 is made to correspond to the engaging part 13 and firmly inserted, the diameter of the outer wall part 9 on the outer periphery of the socket part 10 expands due to the elasticity of the synthetic resin, and the bush main body 1 is attached to the jig 14. The bush main body 1 is elastically inserted and fixed in the concrete C, and in this state, the concrete C is poured, and after curing and hardening, the jig 14 is removed together with the formwork 11, so that the bush main body 1 is buried at a predetermined position in the concrete C.

In short, the present invention consists of integrally molding a bushing body 1 with a female thread 4 formed therein from synthetic resin.
The buried base end 5 of the bush main body 1 is formed with a hook part 7 that projects outward, and the outer periphery of the body part 2 is formed with ribs 6, 6a... projecting in the axial direction. In the insert bush in which the socket part 10 is formed by forming the part 9 to extend forward in a thin and long shape, the inner peripheral part of the cylindrical collar 15 which is made to protrude rearward from the buried base end part 5. Since a semicircular groove 18 is formed around the flange 16 with a diameter larger than that of the mouth edge 17, the groove 18 formed on the inner circumference 16 of the flange ring 15 significantly increases the locking action in the pulling direction. In addition to the latching action of the groove 18, the latching action of the latching part 7 in the pulling direction and the ribs 6, 6
Due to the anti-rotation action and the latching action in the pulling direction, the locking function of the bushing body 1 can be made more reliable.
When suspending the concrete C by screwing a hook bolt or the like onto it, the stress due to the external force caused by its own weight, shaking, etc. is absorbed by the groove 18 of the collar 15, the hooking part 7, the ribs 6, 6a, etc. The concrete C can be safely transported without the bush main body 1 separating from the concrete C.

Furthermore, since the groove portion 18 of the collar ring 15 is formed in a semicircular arc shape, integral molding with synthetic resin is possible.In other words, the groove portion 18 can be easily separated from the mold due to the elastic action of the synthetic resin. Molding can be done easily and at low cost without using split molds for the molding part.

In addition, due to the elastic action of the synthetic resin of the outer wall portion 9, the bushing body 1 is elastically and reliably fitted into and held in the jig 14 for attachment to the formwork 11, and thus the bushing body 1 is held in a predetermined position. Its practical effects are enormous, such as making the burying operation simple and reliable.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a perspective view of the insert bushing according to the present invention.
FIGS. 2 and 3 are cross-sectional views of the same. DESCRIPTION OF SYMBOLS 1... Bush body, 2... Body, 3... Insertion port, 5... Buried base end, 6, 6a... Rib, 7...
...Latching part, 8... Flange part, 9... Outer wall part, 10...
Socket part, 18...Groove part.

Claims (1)

[Scope of utility model registration request] The bush main body with a female thread formed inside is integrally molded from synthetic resin, and the embedded proximal end of the bush main body is formed with an outwardly protruding hook part, and the outer periphery of the body is provided with a locking part in the axial direction. In an insert bush in which a rib is formed to protrude from the bottom and a socket is formed by forming a thin and long outer wall of the insertion port to extend forward, the insert bush has a cylindrical shape that protrudes backward from the buried base end. An insert bushing characterized in that a semi-circular groove having a diameter larger than the mouth edge is formed on the inner circumference of the collar ring.