JPH10219848A - Expansion bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion bolt with sufficient fastening force and shearing force resistance. SOLUTION: For an expansion bolt, the threaded shank 12 of the bolt 1 is inserted through a sleeve 2 and the shank 12 protruded from the sleeve 2 is screwed with a fastening bush 4 for fastening. Expansion sleeves 3, 5 as shafts, one having a through-hole 33 passing through the shank 12 and an engagement part 34 engageable with a wall face to be engageable with the fastening bush 4, are mounted between the sleeve 2 and the fastening bush 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion bolt, and more particularly, to an expansion bolt provided with a sleeve having an anti-shearing force.

[0002]

2. Description of the Related Art A conventional expansion bolt is composed of a bolt sleeve and a tightening bush.
The end of the sleeve is expanded and fixed by pressing the clamping bush. However, as the length of the expansion bolt becomes longer, the effect of tightening and fixing becomes weaker. If the material of the wall of the hole into which the bolt is inserted is soft, there is a problem that the bolt cannot be fixed sufficiently. In addition, since the expansion bolt requires tensile strength due to its design structure, the shearing force is
Since it concentrates on the bolt, there is a problem that it is difficult to select a bolt that can sufficiently cope with the shearing force.

Further, conventional expansion bolts are:
Since it is necessary to select and use various sizes depending on the application, there are restrictions in design and use.

[0004]

Therefore, in the present invention,
It is an object of the present invention to provide an expansion bolt having a sufficient shearing force. Another object of the present invention is to provide an expansion bolt that can be sufficiently tightened and fixed even when the length of the expansion bolt is long.

A further object of the present invention is to provide an expansion bolt which can easily be adapted to various lengths only by adding a sleeve.

[0006]

Means for Solving the Problems The present invention has the following arrangement to solve the above-mentioned problems. In the expansion bolt according to the first aspect, a shaft (12) made of a screw of the bolt (1, 1a) is inserted into the sleeve (2, 2a), and protrudes from the sleeve (2, 2a).
In the expansion bolt which tightens by screwing 2) with the tightening bush (4), between the sleeve (2, 2a) and the tightening bush (4),
A shaft having a through hole (33) through which the shaft (12) is inserted, the shaft having a meshing portion (34) capable of meshing with a wall surface;
An expansion sleeve (3, 5) that can be fitted to the fastening bush (4) is interposed.

According to a second aspect of the present invention, there is provided an expansion bolt having a shaft portion (12) formed with a thread over a predetermined length from a front end, and a rear end of the shaft portion (12) having a diameter larger than that of the shaft portion (12). Bolts (1, 1) with large bolt heads (11)
1a) and a shaft having a through hole (21) through which the shaft (12) of the bolt (1, 1a) is insertable and shorter than the shaft (12). A sleeve (2, 2a) having a sleeve head (22) having a large diameter and having a head hole (23) formed on the sleeve head (22) side so that a bolt head (11) can be locked; , 1a) through holes (3) through which the shaft portions (12) can be inserted.
3) having a wing piece (31) opposed to the rear side of the shaft body, and having an opposed fitting groove (32) formed from the tip side of the shaft body; A fixed expansion sleeve (3) having a meshing portion (34) with a larger number of projections formed thereon, and a cone having a diameter decreasing toward the rear end, and a shaft (12) of a bolt (1, 1a). A fastening bush (4) having a threadable through-hole (41) and having opposing wing pieces (42) which can be fitted into fitting grooves (32, 54) of the expansion sleeve (3, 5). It is characterized by being performed.

According to a third aspect of the present invention, in the expansion bolt of the second aspect, the bolt head (11) is formed of a cone whose diameter increases toward a rear end, and a head hole of the sleeve (2, 2a). (23)
Is characterized by a cone hole. The expansion bolt according to claim 4 is the expansion bolt according to claim 2 or 3, wherein the wing piece (31) and the fitting groove (32) of the fixed expansion sleeve (3) are formed to cross each other. It is characterized by having been done.

According to a fifth aspect of the present invention, there is provided an expansion bolt according to any one of the first to fourth aspects, further comprising a shaft having a through hole, the diameter of which decreases toward the rear end of the shaft. (51) are integrally disposed, the cone (51) is provided with opposing wing pieces (52), and the front end side is formed with opposing fitting grooves (54). ) And the fitting groove (54) are disposed so as to be perpendicular to each other, and the fitting groove (54) can be fitted with the wing (42) of the fastening bush (4),
On the fitting groove (54) side of the shaft body, an expansion sleeve (5) having a meshing portion (53) formed of a number of projections is further provided between the fixed expansion sleeve (3) and the tightening bush (4). An expansion bolt, wherein the expansion bolt is interposed.

According to a sixth aspect of the present invention, there is provided the expansion bolt according to any one of the second to fifth aspects, wherein the bolt (1) has a thread formed over the entire shaft portion (12). It is characterized by. The expansion bolt according to claim 7 is the expansion bolt according to any one of claims 1 to 5, wherein the shaft (12) of the bolt (1) is partially screwed over a predetermined length from the tip end side. It is characterized by being formed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is an exploded perspective view of the first embodiment of the present invention, FIG. 2 is a sectional view showing a state where the expansion bolt of FIG. 1 is assembled and embedded in a wall hole, and FIG. FIG. 4 is a perspective view of the first embodiment of the present invention at the time of assembly, and FIG. 4 is a perspective view of the first embodiment of the present invention at the time of assembly with a plurality of expansion sleeves incorporated therein.

First, a first embodiment of the present invention will be described. The expansion bolt of the present invention basically includes a bolt 1, a sleeve 2, a fixed expansion sleeve 3, and a fastening bush 4. When a longer bolt is used, one or more expansion sleeves 5 are additionally used.

The bolt 1 is made of a metal material, and is provided with a shaft portion 12 formed with a screw having an appropriate length, and a bolt head 11 at a rear end of the shaft portion 12. The bolt head 11 is a cone whose diameter increases toward the rear end. In the first and second embodiments, the left side in the drawing, that is, the direction in which the bolt is inserted into the wall hole is the front end side, and the right side, that is, the bolt head side, is the rear end side.

The sleeve 2 is a shaft body made of a metal material. The sleeve 2 has a through hole 21 having substantially the same diameter as the shaft portion 12 of the bolt 1 and through which the shaft portion 12 can be inserted. 22. A conical hole-shaped head hole 23 is formed in the sleeve head 22 so as to conform to the shape of the bolt head 11. As shown in FIG. 2, the sleeve 2 is embedded in the hole in the wall surface by locking the sleeve head 22 on the wall surface of the wall 7.

The fixed expansion sleeve 3 is a shaft made of a plastic material and having a through hole 33.
The through hole 33 has substantially the same diameter as the shaft 12 of the bolt 1
And can be inserted. At the rear end side, two opposing wing pieces 31 are provided which are inclined so that the diameter increases toward the rear end, and at the front end side, two opposing elongated fitting grooves 32 are formed. . The wing pieces 31 and the fitting grooves 32 are disposed so as to intersect perpendicularly with each other. Also, on the fitting groove 32 side of the fixed expansion sleeve 3,
An engagement portion 34 is formed by a large number of projections and is in mesh with the wall hole.

The tightening bush 4 is a conical sleeve whose diameter decreases toward the rear end.
And two wing pieces 42 facing each other are provided throughout the cone. The wing piece 42 is inclined such that the diameter of the tip is the same as the tip of the cone 43, and is large enough to be fitted in the fitting groove 32.

The expansion sleeve 5 is a shaft made of a plastic material and having a through hole 55. The shaft body is formed integrally with a cone 51 whose diameter decreases toward the rear end, and two opposing anti-rotation blade pieces 52 are provided on both sides thereof. The wing pieces 52 are inclined such that the diameter of the rear end is the same as the diameter of the shaft body. Two elongated fitting grooves 54 facing each other are formed on the tip side of the shaft body. The wing pieces 52 and the fitting grooves 54 are arranged to intersect perpendicularly with each other. The fitting groove 54 is formed in a size that can be fitted with the wing 42 of the fastening bush 4. Further, on the fitting groove 54 side, a meshing portion 53 composed of a number of projections meshing with the wall surface hole is formed.

Next, the assembly of the expansion bolt will be described. First, the shaft portion 12 of the bolt 1 is inserted into the sleeve 2, the fixed expansion sleeve 3, and the fastening bush 4 in order from the front end direction and assembled. At this time, the two opposing wing pieces 42 of the fastening bush 4 are fitted and locked in the opposed fitting grooves 32 of the fixed expansion sleeve 3. Also, as shown in FIG.
The rear end of the fixed expansion sleeve 3 is the sleeve 2
So that Furthermore, screw in the bolt 1 and
The fastening bush 4 is tightly fitted into the fixed expansion sleeve 3 by being screwed into the through hole 41 of the fastening bush 4. In this way, as shown in FIG. 3, all parts are assembled in advance and then press-fitted into the wall holes. At this time, since the wing pieces 31 of the fixed expansion sleeve 3 are made of a plastic material, they are pushed into the wall holes by press fitting. In this way, the expansion bolt can be tightly embedded in the wall hole, and the fastening member 6 can obtain firm fastening. Further, since the bolt 1 is embedded in the sleeve 2, the shearing force is directly applied to the sleeve 2, so that the bolt 1 is not affected.

As shown in FIG. 4, when the expansion sleeve 5 is incorporated, the wing piece 5
2 is fixed groove 32 of expansion sleeve 3
Then, the cone 51 is fitted into the through hole 33 until it stops. The wing piece 42 of the fastening bush 4 is assembled into the fitting groove 54 by pushing the wing piece 42 into the fitting groove 54 until the cone 43 is engaged with the through hole 55.

As described above, the expansion sleeve 5
The bolt can be extended simply by being fitted in combination with the fixed expansion sleeve 3, and the tensile strength of the expansion bolt can be increased. In addition,
If a longer bolt 1 is used, it is of course possible to increase the number of expansion sleeves 5. Further, regarding the second embodiment of the present invention, FIGS.
It will be described based on.

FIG. 5 is an exploded perspective view of a second embodiment of the present invention, FIG. 6 is a sectional view of the state in which the expansion bolt of FIG. 5 is assembled and embedded in a wall, and FIG. It is a perspective view at the time of an expansion bolt assembly. As shown in FIG. 5, the second embodiment is different from the first embodiment in that a cylindrical expansion shaft portion having no screw formed on a shaft portion 12a formed with a screw of a bolt 1a. 13
Is provided. As a result, the bolt 1a is extended, so that the sleeve 2a is correspondingly extended by the extension shaft portion 13.

Next, the assembly of the second embodiment will be described. First, the shaft portion 12a of the bolt 1a is inserted through the sleeve 2a, the fixed expansion sleeve 3, and the tightening bush 4 in this order.
The wing piece 42 of the fastening bush 4 is fitted into the fitting groove 32 of. When the bolt 1a is screwed in, the tightening bush 4 is screwed with the bolt 1a.
The expansion bolt is assembled. Then, the fastening member 6 and both side walls 7a, 8a separated by a certain distance
The expansion bolt is press-fitted into the hole provided through the through hole. This allows the expansion bolt to be firmly fitted into the wall hole, so that the fastening member 6 can be firmly fixed even on a wall surface that separates a space. Further, since the bolt 1a is embedded in the sleeve 2a, the shearing force is
a, the bolt 1a is not affected.

[0023]

As described above, according to the present invention, a shaft (12) made of a screw of a bolt (1, 1a) is inserted into a sleeve (2, 2a), and protrudes from the sleeve (2, 2a). 1
In the expansion bolt which tightens by screwing 2) with the tightening bush (4), between the sleeve (2, 2a) and the tightening bush (4),
A shaft having a through hole (33) through which the shaft (12) is inserted, the shaft having a meshing portion (34) capable of meshing with a wall surface;
In addition, since the expansion sleeve (3, 5) that can be fitted to the fastening bush (4) is interposed, the expansion bolt having a sufficient shearing force can be obtained because the sleeve receives the shearing force instead of the bolt main body. Can be provided.

Further, according to the present invention, even when the length of the expansion bolt is long, it is only necessary to connect a plurality of expansion sleeves, and it is possible to provide an expansion bolt which can be sufficiently fastened and fixed. In addition, the shaft portion (12) of the bolt (1a) can be firmly fixed even if it is a wall surface separated by a space by partially forming a screw over a predetermined length from the tip end side. This has the effect.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state where the expansion bolt of FIG. 1 is assembled and embedded in a wall.

FIG. 3 is a perspective view of the expansion bolt of FIG. 1 when assembled.

FIG. 4 is a perspective view of the first embodiment of the present invention at the time of assembly with a plurality of expansion sleeves incorporated therein.

FIG. 5 is an exploded perspective view of a second embodiment of the present invention.

FIG. 6 is a sectional view showing a state where the expansion bolt of FIG. 5 is assembled and embedded in a wall.

7 is a perspective view of the expansion bolt of FIG. 5 at the time of assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Bolt 11 Bolt head 12, 12a Shaft part 13 Expansion shaft part 2, 2a Sleeve 21 Through hole 22 Sleeve head 23 Head hole 3 Fixed expansion sleeve 31 Wing piece 32 Fitting groove 33 Through hole 34 Engagement part 4 Tightening bush Reference Signs List 41 through hole 42 wing piece 43 cone 5 expansion sleeve 51 cone 52 wing piece 53 meshing part 54 fitting groove 55 through hole 6 fastening member 7, 7a, 8 wall

Claims (7)

[Claims] A shaft (12) made of a screw of a bolt (1, 1a) is inserted into a sleeve (2, 2a), and a shaft (12) protruding from the sleeve (2, 2a) is tightened to tighten a bush (12). An expansion bolt which is tightened by being screwed in 4). A shaft having a through hole (33) for inserting the shaft (12) between the sleeve (2, 2a) and the tightening bush (4). An expansion bolt having an engagement portion (34) that can be engaged with the fastening bush (4) and an expansion sleeve (3, 5) that can be fitted to the fastening bush (4). 2. A shaft (12) having a thread formed over a predetermined length from a front end, and a shaft (1) at a rear end of the shaft (12).
2) A bolt (1, 1a) having a larger diameter bolt head (11) and a through hole (21) through which a shaft portion (12) of the bolt (1, 1a) can be inserted and shorter than the shaft portion (12). A head having a sleeve head (22) having a larger diameter than the shaft at the rear end of the shaft, and a bolt head (11) formed on the sleeve head (22) side so as to be able to be locked. Hole (23)
And a shaft body having a through hole (33) through which the shaft part (12) of the bolt (1, 1a) can be inserted, and a wing piece ( 31), a fixed expansion sleeve (3) having a mating portion (34) having opposed fitting grooves (32) formed from the distal end side of the shaft body and having a number of projections formed from the distal end side. And a through-hole (4) that can be screwed with the shaft (12) of the bolt (1, 1a).
1) and a fastening bush (4) having opposed wing pieces (42) that can be fitted into the fitting grooves (32, 54) of the expansion sleeve (3, 5). , Expansion bolt. 3. The expansion bolt according to claim 2, wherein the bolt head (11) is formed of a cone whose diameter increases toward a rear end, and the head hole (2) of the sleeve (2, 2a).
3) An expansion bolt having a cone hole. 4. The expansion bolt according to claim 2, wherein the wing piece (31) and the fitting groove (32) of the fixed expansion sleeve (3) are provided.
The expansion bolts are disposed so as to cross each other vertically. 5. The expansion bolt according to claim 1, wherein a shaft having a through hole, a cone (51) having a diameter decreasing toward a rear end is integrally formed on the shaft. Set up and cone (51)
Are provided with opposing wing pieces (52), and are formed with opposing fitting grooves (54) on the tip end side.
1) and the fitting groove (54) are arranged to intersect perpendicularly with each other, and the fitting groove (54) can be fitted with the wing piece (42) of the fastening bush (4), and the fitting groove (54) of the shaft body is formed. On the 54) side, a meshing portion (5
The expansion sleeve (5) on which 3) is formed,
Further, an expansion bolt is interposed between the fixed expansion sleeve (3) and the fastening bush (4). 6. The expansion bolt according to claim 2, wherein the bolt (1) is formed with a screw over the entire shaft portion (12). . 7. The expansion bolt according to claim 1, wherein the shaft portion (12) of the bolt (1) is partially formed with a thread over a predetermined length from a tip end side. An expansion bolt, characterized in that: