JPS6321783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an expansion device used when fixing structures, equipment, and other members to mating materials such as concrete, brick, wood, synthetic resin, and metal, or when fixing plate-like members to each other. This is related to open anchors.

A main body having a plurality of expansion pieces on the distal side that are made of metal or synthetic resin and divided by split grooves extending in the axial direction, and an insertion hole that reaches at least the split groove from the proximal end surface; Expansion anchors are well known which consist of a rod-shaped member inserted into a hole and which acts to spread the expansion pieces. This type of expansion anchor can be roughly divided into two types: those in which the split groove does not reach the tip of the main body, and those in which the groove reaches the tip. In the latter type, the expansion piece bulges out toward the tip. In addition, the rod-shaped member is composed of a round bar-shaped rod, which is inserted into the insertion hole of the main body and pushed in by hammering, etc., and uses the difference in diameter to push and expand the expansion piece. It can be roughly divided into two types: those in which the expanding pieces are pushed and expanded by screwing them into the insertion hole and utilizing the difference in their diameters, or by pulling back the tip of the main body.

That is, in any combination of structures, the distal end side of the main body is pushed out and acts to fix the plurality of members to each other, and the proximal end side of the main body is inserted into the hole of the mating member or member. In particular, in the case of a rod-shaped member with a male thread that is inserted into the insertion hole while being screwed into the insertion hole, the main body will not bite into the hole wall when the expansion piece is pushed apart. It must be fixed so that it does not rotate together.

In the present invention, by providing a claw piece on the base end of the main body that is pushed outward when the rod-shaped member is inserted into the insertion hole from the base end surface, co-rotation can be easily prevented and the fixing force can be increased. It is something.

Embodiments of the present invention will be described below with reference to the drawings.

The main body 1 of the embodiment shown in FIGS. 1 to 4 is made of synthetic resin, and the distal side has two enlarged grooves 2 extending in the axial direction from the proximal end to the distal end from the center. The opening pieces 3, 3 are divided into grooves, and the expanding pieces 3, 3 are provided with a plurality of annular small diameter parts 4a, and the part between them and at the tip is annular for biting in or for preventing slippage. A protrusion 4 is formed. The proximal end side of the split groove 2 has two flat surfaces 5, 5 perpendicular to the split groove 2, and a very slightly protruding protrusion 6 extending in the axial direction is formed in the center of the flat surfaces 5, 5. Anti-rotation protrusions 7 extending in the axial direction are formed on both end edges of each.
Rectangular window holes 8, 8 extending in the axial direction are provided in two arcuate portions perpendicular to the planes 5, 5, and cantilevered claw pieces 9, 9 are integrated with the main body 1 at the tips.
are provided to almost cover the window holes 8, 8, and these claw pieces 9, 9 have an uneven strip 10 on their outer surface for biting or for preventing them from coming off, and a bulge protruding into the insertion hole 12 on their inner surface. It has an exit part 11. The insertion hole 12 reaches near the base end of the split groove 2 from the base end surface,
From there, the tip becomes an inclined end 12a that gradually becomes smaller in diameter.

The rod-like member 13 can be either a rod or a male-threaded member.

5 and 6 show the case where the plate-shaped portion of the member 32 is overlapped and fastened to a mating material 31 such as concrete, and the main body 1 is pushed into the hole 31a of the mating material 31, and the base end surface is almost aligned with the surface. almost tightly inserted,
The member 32 is placed on top of the member 32, and the rod-like member 13, which is a threaded rod having a male thread 14 and a head 15, is inserted into the insertion hole 12 through the hole 32a of the member 32. The insertion hole 12 and the rod-shaped member 13 have approximately the same diameter, and the tip of the rod-shaped member 13 first hits the bulge 11 to push out the claw pieces 9, 9 from the window holes 8, 8.
It is pressed against the wall surface of the hole 31a of the mating member 31 and further bitten in (FIG. 5). When the rod-shaped member 13 is screwed in from this point, after the tip reaches the split groove 2, the expansion piece 3,
3, and move the member 32 into the mating member 3.
1, and the expanded pieces 3, 3 are attached to the hole 31.
Press it onto the wall of part a and dig in further.

FIG. 7 shows a case where two plate-shaped members 33 and 34 are fixed to each other, in which a rod-shaped member 13 made of a round bar-shaped rod is pushed into the insertion hole 12 by hammering, and the claw pieces 9 and 9 are pushed into the insertion hole 12. is biting into the wall surface of the hole 33a of the front side member 33, and the expansion pieces 3, 3 are biting into the wall surface of the hole 34a of the back side member 34, and the portions protruding from it to the back side are pushed outward and expanded, Members 33 and 34 cooperate with the head 16 of the rod-shaped member 13.
It is clamped and fixed.

In the embodiment described above, the protrusion 7 provided at the base end of the main body 1 protrudes in a tangential direction to the outer peripheral surface of the main body 1, which is circular in plan, and is more effective as a rotation stopper than the normal protrusion 7 that protrudes in the radial direction. It is excellent.

The main body 21 of the embodiment shown in FIGS. 8 and 9 is made of synthetic resin or metal in a tubular shape, and has a plurality of, for example, four, grooves 22 extending in the axial direction from the proximal end to the distal end from the center. Four expansion pieces 23 are formed separately, each having a female thread 24 at its tip and a collar 25 at its base. At the base end of the main body 21, two rectangular window holes 26, 26 extending in the axial direction are provided at symmetrical positions with the center in between, and are integrated with the main body 21 at the base end and have the same unevenness as in the previous embodiment. Claw members 27, 27 having stripes 28 and bulges 29 are provided to substantially close the window holes 26, 26.

The main body 21 of this embodiment is used in combination with a rod-shaped member 13 made of a bolt rod, and the plate-shaped portion of the member 32 is stacked on a mating material 31 such as concrete, and the main body 21 is pushed into the holes 32a and 31a. to bring the collar 25 into almost intimate contact with the surface of the member 32,
The rod-shaped member 13 is inserted almost tightly into the insertion hole 30, and its tip first touches the claw pieces 27, 27 through the window holes 26, 26.
The widening portion is formed by pushing the distal end of the main body 21 back toward the proximal direction by pushing it out, pressing it against the wall surface of the hole 32a of the member 32 and biting it in, and then inserting it further so that it engages with the female thread 24 and screws in. The piece 23 is bulged out and press-fitted to the wall surface of the hole 31a of the mating member 31 to bite into it (FIG. 10).

This embodiment can also be used for fixing two or more plate-shaped members to each other, and at this time, the expanding piece 23 is bent in half on the back side of the back member and is expanded.

As described above, the present invention provides a claw piece in a cantilevered manner at the proximal end of the main body, which has a plurality of expanding pieces on the distal end side that can be pushed and expanded by a rod-shaped member, and the rod-shaped member is inserted into the insertion hole. When inserted, the claw piece is first pushed outward, so the claw piece presses against the part of the mating material near the hole surface or the wall of the hole of the overlying member, and is further bitten. In the case of a type in which a bar-shaped member is screwed in, there is no need to fix the main body so that it does not rotate as it acts as a rotation stopper, and can be easily installed with tools such as a screwdriver or wrench. In addition, the claw member cooperates with the expansion piece to press the main body against the wall surface over a wide area, and because it is a cantilever type, the free end side protrudes greatly, significantly increasing the adhesion force and withstanding strong pulling force. It has the following effects.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a partially cutaway side view, Fig. 3 is a vertical sectional view, and Fig. 4 is a longitudinal sectional view.
The figure is a plan view, FIGS. 5, 6, and 7 are longitudinal sectional views in use, FIG. 8 is a front view showing different embodiments of the present invention, FIG. 9 is a longitudinal sectional view, and FIG. is a vertical cross-sectional view of the device in use. 1... Main body, 2... Division groove, 3... Expansion piece, 8
... Window hole, 9 ... Claw piece, 11 ... Swelling part, 12
...insertion hole, 13 ... rod-shaped member, 21 ... main body,
22... Division groove, 23... Expanding piece, 26... Window hole, 27... Claw piece, 29... Swelling part.

Claims (1)

[Claims] 1. A main body that has a plurality of expansion pieces divided by grooves extending in the axial direction on the distal side and has an insertion hole that reaches at least the groove from the proximal end surface, and a main body that is inserted into the insertion hole and expanded. In an expansion anchor consisting of a combination with a rod-shaped member that pushes and expands an opening piece,
An expansion anchor characterized in that a proximal end of a main body is provided with a cantilevered claw piece that is pushed outward by a rod-shaped member.