JPH0882014A - Anchor bolt - Google Patents

Abstract

PURPOSE: To install an anchor bolt fixedly even on the fixing surface part made of a material with rather small driving strength. CONSTITUTION: An anchor bolt is provided with a bolt main body 23 and a sleeve 26 installed on the shaft part 24 of the bolt main body 23, and the sleeve 26 is formed roughly in cylindrical shape through the entire unit and made of a flexible material. Also multiple slits 30 into which the shaft part 24 of the bolt main body is inserted so that it can be rotated inside it are formed on the inner periphery surface of the bolt main body 23 on the shaft top end side, are provided with a screw part 28 which is screwed into the screw groove 27 of the shaft part 24, and form along the axial direction a sleeve piece 31 at a position apart by a specified distance from the end of the sleeve 26 on the head part 25 of the bolt main body 23. Then a metallic cylindrical member 42 formed into a specified width dimension is placed between the end part of the sleeve 6 on the head part 25 side of the bolt main body 23 and the sleeve piece 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor bolt, and more particularly to an anchor bolt which can be driven and fixed even when the fixing surface portion has a small driving strength.

[0002]

2. Description of the Related Art Generally, anchor bolts are widely used for fixing an object to be fixed to a fixing surface portion such as a gypsum board. As such an anchor bolt, conventionally,
For example, there is one as shown in FIGS.

That is, it has a bolt body 10 and a synthetic resin covering portion 12 mounted on a shaft portion 11 of the bolt body 10. The covering portion 12 is provided on the upper end side of the shaft portion 11. A base end portion 13, a screwing portion 15 that is screwed into a screw portion of the shaft portion 11 on the lower end side of the shaft portion 11, and the screwing portion 15
And two locking pieces 18, 1 formed between the base and the base end portion 13.
9 and.

The base end portion 13 is provided with a flange portion 20 formed on the edge and a plurality of rotation stopping engagement pieces 43 provided on the back surface side of the flange portion 20. When using the anchor bolt 16 configured as described above, for example, the anchor bolt 16 is driven into a fixing hole portion 21 formed in a fixing surface portion 17 such as a gypsum board. In this case, the flange portion 20
Engages with the peripheral surface portion of the fixing hole portion 21 and the rotation stopping locking piece 43 provided on the covering portion 12 engages with the peripheral edge portion of the fixing hole portion 21, so that the covering portion 12 has the fixing surface portion. 1
It is temporarily fixed in a state where it does not rotate with respect to 7.

Then, the bolt body 1 is formed by using an appropriate tool.
When the head portion 14 of 0 is rotated, the covering portion 12 is fixed to the fixing surface portion 17 by the rotation stopping locking piece 43 so as not to rotate, and therefore the shaft portion 11 of the bolt body 10 is fixed. By the rotation, the screwing portion 15 screwed into the screw portion of the shaft portion 11 approaches the base end portion 13.

When the flange portion 20 is pressed against the head portion 14 of the bolt body 10, the two locking pieces 1 are joined together.
The stresses acting in the directions of compressing each other in the longitudinal direction act on 8 and 19, and the locking pieces 18 and 19 gradually move toward the shaft portion 1.
1 Start expanding outwards. Then, the two locking pieces 18, 19 expand inside the fixed surface portion 17 so that they cannot be easily pulled out, and the anchor bolt 16 is securely driven and fixed inside the fixed surface portion 17. (See, for example, Japanese Utility Model Publication No. 29-3006, Japanese Patent Publication No. 47-36067, or U.S. Pat. No. 2,918,841).

[0007]

By the way, in the conventional anchor bolt 16 as described above, the locking piece 1 is used.
In the fixing surface portion 8, 8 and 19, the flange portion 2
It is configured to greatly expand at a position extremely close to 0. Therefore, when such a conventional anchor bolt 16 is driven into the fixed surface portion 17, the locking piece 1 is located at a portion extremely close to the surface portion of the fixed surface portion 17.
When the fixed surface portion 17 is made of a material having a relatively low driving strength, the fixed surface portion 17 cannot withstand the pressing force of the locking pieces 18 and 19 that are opened, and thus, depending on the case. However, there is a problem in that the surface of the fixed surface portion 17 is partly peeled off, and the object to be fixed cannot be reliably fixed to the fixed surface portion 17.

[0008] Therefore, the technical problem of the invention described in claim 1 is that, even in the fixing surface portion made of a material having a relatively small driving strength, it is securely fixed to the fixing surface portion without causing collapse of the driving portion. It is to provide an anchor bolt that can

[0009]

In order to solve such a technical problem, the fixing surface portion (3
An anchor bolt (22) to be driven into a bolt body (23) having a bolt body (23) and a sleeve (26) mounted on a shaft portion (24) of the bolt body (23). ) Is formed into a substantially cylindrical shape as a whole, and is made of a flexible material, and the shaft portion (24) of the bolt body (23) is rotatably inserted therein, and the shaft portion of the bolt body (23) is The thread groove of the shaft portion (24) is formed on the inner peripheral surface portion (36) on the tip end portion (45) side of the (24).
(27) has a screwing portion (28) to be screwed, and at a portion separated from the end (48) on the head (25) side of the bolt body (23) of the sleeve (26) at a predetermined interval. , A plurality of slits (30) forming a sleeve piece (31) along the axial direction are provided, and the sleeve (2
Between the end (48) of the bolt body (23) of the bolt body (23) on the side of the head (25) and the sleeve piece (31), there is provided a metal tubular member (42) having a predetermined width dimension. When it is capped and embedded in the fixed surface part (39), the sleeve (2
Rotate the bolt body (23) in the
Expand each sleeve piece (31) by bulging the (31) outward of the shaft portion (24) between the front end portion (46) and the rear end portion (47) of the sleeve piece (31). It is characterized in that it is fixed to the fixed surface portion (39).

[0010]

[Operation] Therefore, in the invention according to claim 1, the anchor bolt (22) is driven into the fixing hole portion (40) formed in the fixing surface portion (39) to be temporarily fixed, and the bolt body (23 ) Is inserted into the sleeve (26) and screwed into the screwing portion (28), and the shaft portion (24) of the bolt body (23) is rotated by using an appropriate tool, (26) approaches the head (25), the head (25) side end (48) of the bolt body (23) is pressed against the head (25) of the bolt body (23), and each sleeve One piece (31) is sleeve (2
Due to the stresses acting in the directions of compressing each other in the length direction of 6), the sleeves gradually bulge outward of the shaft portion (24) between the front end portion (46) and the rear end portion (47), and each sleeve The piece (31) begins to spread.

In this case, each of the sleeve pieces (31) is separated from the end portion (48) of the bolt body (23) on the head (25) side by a predetermined distance in the screwing portion (28) direction. Since each of the sleeve pieces (31) is formed on the inner surface of the fixed surface portion (39), the sleeve piece (31) expands at a position that is inward of the surface of the fixed surface portion (39) by a predetermined distance. Also, the end (48) of the head (25) side of the bolt body (23) of the sleeve (26).
Between the sleeve piece (31) and the sleeve piece (31), the metal tubular member (42) having a predetermined width is capped, so that the end portion (48) of the sleeve (26) and the sleeve piece ( The strength with 31) is large.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the accompanying drawings. FIG. 1 shows an embodiment of an anchor bolt according to the present invention, a cross-sectional view showing a state before driving into a fixed surface portion, and FIG. 2 shows an embodiment of an anchor bolt according to the present invention. 3 is a perspective view showing a state in which the member to be fixed is fixed to the fixing surface portion using the anchor bolts; FIG.
Shows an embodiment of the anchor bolt according to the present invention, and is a perspective view showing a state in which each sleeve piece is opened by driving into the fixing surface portion, and FIG. 4 shows an embodiment of a conventional anchor bolt, 5 is a perspective view showing a state before driving of FIG.
FIG. 6 is a perspective view showing an example of a conventional anchor bolt and showing a state after driving into a fixing surface portion.

As shown in FIGS. 1 and 2, the anchor bolt 22 according to the present embodiment is configured to be driven into the fixing surface portion 39, and is attached to the bolt main body 23 and the shaft portion 24 of the bolt main body 23. Mounted sleeve 26. In the present embodiment, the sleeve 26 is formed in a generally hollow cylindrical shape, and the outer peripheral surface portion 37 in a cross section orthogonal to the axial direction is formed in a circular shape. Further, the sleeve 26 in the present embodiment is made of synthetic resin and has flexibility, and the inside thereof is provided with a void portion 34 through which the shaft portion 24 can be rotatably inserted.

The sleeve 26 has the inner peripheral surface portion 3 on the side of the tip portion 45 of the shaft portion 24 of the bolt body 23.
6 and the outer peripheral surface portion 37 of the end portion 48 on the head 25 side of the bolt body 23, which is formed over the entire circumference. As the three rotation preventing projections provided on the flange portion 29 and the tip portion 45 side of the shaft portion 24 of the flange portion 29 and extending between the flange portion 29 and the outer peripheral surface portion 37 of the sleeve 26. Ribs 38 of.

Then, three slits 3 are provided along the axial direction at a portion separated from the flange portion 29 formed at the end portion 48 of the bolt body 23 on the head portion 25 side by a predetermined distance.
0 is formed over the entire thickness dimension of the sleeve 26,
A sleeve piece 31 is formed between each slit 30. That is, on the end portion 48 side of the sleeve main body 25 side of the bolt 26 of the sleeve 26, the large diameter portion 3 formed thickly
2 is formed over a predetermined size, and the large diameter portion 32
Three slits 30 are formed between and the screwing portion 28.

Further, the anchor bolt 22 according to the present embodiment.
In this case, a metallic cylindrical member 42 formed to have the same width dimension as the large diameter portion 32 is capped on the large diameter portion 32, and the metallic cylindrical member 42 serves as a reinforcing member. It is configured to work. Hereinafter, the operation of the anchor bolt according to this embodiment will be described. When the fixed member 33 is fixed to the gypsum board 39 as the fixed surface portion by using the anchor bolt 22 described in the present embodiment, first, the sleeve 26 constituting the anchor bolt 22 is formed.
Is press-fitted into the fixing hole portion 40 formed in the gypsum board 39 until the flange portion 29 of the sleeve 26 comes into contact with the peripheral edge of the fixing hole portion 40 formed in the gypsum board 39.

In this case, the ribs 38 as the three rotation preventing projections formed on the tip portion 45 side of the shaft portion 24 of the flange portion 29 have the holes of the fixing hole portion 40 formed in the gypsum board 39. It engages with the peripheral edge of the portion and acts as a rotation stopper in the circumferential direction of the axial center of the sleeve 26 when the bolt body 23 is screwed in. Next, an appropriate fixed member 3
Insert the bolt main body 23 into the hole 44 formed in 3,
The bolt body 23 is inserted into the sleeve 26 via the fixed member 33, and the screw groove 27 of the bolt body 23 is screwed into the screwing portion 28 formed in the inner peripheral surface portion 36 of the sleeve 26.

After that, the bolt main body 2 is prepared by using an appropriate tool.
3, the bolt body 23 is screwed into the sleeve 26, and the flange portion 29 of the sleeve 26 is pressed against the head portion 25 via the fixed member 33. As a result, as shown in FIG. 3, each sleeve piece 31 formed between the screwing portion 28 and the flange portion 29 has the shaft portion 24 of the bolt body 23.
From the screwing portion 28 to the flange portion 29 generated by the rotation of
Due to the stress acting in the direction, each sleeve piece 31 gradually bulges outward of the shaft portion 24 at a substantially intermediate portion between the tip end portion 46 and the rear end portion 47 of each sleeve piece 31.

Accordingly, the three projecting sleeve pieces 31 spread out in the inner part when the gypsum board 39 is formed thick, and in the back surface part when the gypsum board 39 is formed thin. For anchor bolt 2
The pull-out resistance of No. 2 becomes large, and the anchor bolt 22 is fixed to the gypsum board 39. Therefore, even when the anchor bolt 22 according to the present embodiment is used to drive the fixing surface portion 39, such as a gypsum board, whose driving strength is not so large, as described above,
Each sleeve piece 31 is separated from the end portion 48 of the bolt main body 23 on the head portion 25 side by a predetermined distance in the threaded portion 28 direction by the size of the large diameter portion 32 formed below the flange portion 29. Each of the sleeve pieces 31 is formed so as to expand from a position that is inward from the surface portion of the gypsum board 39 by a dimension corresponding to the large diameter portion 32. Even in such a case, the peripheral surface portion of the fixing hole portion 40 of the gypsum board 39 does not collapse due to the pressing force of expanding the sleeve pieces 31.

Further, as described above, in the anchor bolt 22 according to this embodiment, the large diameter portion 32 and the large diameter portion 32 are formed on the large diameter portion 32 formed between the flange portion 29 and the sleeve piece 31. A tubular member 42 made of metal and having the same width dimension is capped, and the tubular member 42 made of metal is configured to function as a reinforcing member. Therefore, the bolt body 23 is rotated to bring the sleeve 26 close to the head portion 25, and press-contact the fixed member 33 of the flange portion 29,
Even when the sleeve pieces 31 are expanded, the metal tubular member 42 is capped and therefore the bolt body 2
In the process of tightening 3, the large-diameter portion 32 becomes the sleeve piece 3.
1 cannot withstand the tensile force at the time of expanding, and even if the upper ends of the slits 30 forming the sleeve piece 31 are torn and spread further upward, the sleeve piece 31 is located in the vicinity of the flange portion 29. It is possible to prevent the situation of expanding from.

As a result, the fixing hole 40 of the gypsum board 39
It is possible to prevent collapse of the peripheral surface portion of and to securely fix the fixed member 33 to the gypsum board 39. In the present embodiment, since the metallic tubular member 42 is capped between the flange portion 29 of the sleeve 26 and the sleeve piece 31, the width dimension is small when driving into the fixed surface portion with low driving strength. Sleeve piece 3 using a large metal tubular member
1 can be expanded from below the shaft portion 24, and an anchor bolt corresponding to the driving strength of the fixed surface portion can be created and used by appropriately changing the width dimension of the ring member according to the driving strength of the fixed surface portion. You can

In the anchor bolt 22 according to this embodiment, the head 26 of the bolt body 23 is attached to the sleeve 26.
Since the flange portion 29 that engages with the fixed surface portion 39 is formed at the end portion 48 on the fifth side, the sleeve 2
6 is securely temporarily fixed to the surface of the gypsum board 39, and the bolt body 23 has an effect of being easily screwed into the sleeve 26.

Further, the anchor bolt 22 according to the present embodiment.
In this case, since the outer peripheral surface portion 37 of the sleeve 26 has a circular shape in a cross section orthogonal to the axial direction, the sleeve 26 has an effect of being easily driven into the gypsum board 39. Further, in the anchor bolt 22 according to the present embodiment, the tip end portion 45 of the shaft portion 24 of the flange portion 29.
On the side, the flange portion 29 and the outer peripheral surface portion 37 of the sleeve 26 are provided.
Since the three ribs 38 are provided as the rotation preventing projections provided over the and, when the bolt body 23 is screwed into the sleeve 26 temporarily fixed to the gypsum board 39, the bolt body 23 and the axis line There is an effect that the bolt main body 23 can be securely screwed in without rotating in the circumferential direction.

In each of the above embodiments, the case where the sleeve 26 is made of synthetic resin has been described as an example. However, the sleeve 26 is not limited to the above embodiment and may be a flexible material such as metal. However, the present invention is not limited to the above embodiment. Further, in the above-described embodiment, the case where the fixed member is fixed to the fixed surface portion by using the anchor bolt according to the above-described embodiment has been described as an example, but the present invention is not limited to the above-described embodiment, and the fixed surface portion is covered. It is also possible to drive it as it is without interposing a fixing member and use it to lock an object to be locked to the anchor bolt.

[0025]

The anchor bolt according to the invention described in claim 1 has the above-mentioned structure, and is provided at a predetermined distance from the head-side end of the bolt body of the sleeve.
A plurality of slits that form a sleeve piece are provided along the axial direction, and a metal piece formed in a predetermined width dimension is provided between the sleeve piece and the head side end of the bolt body of the sleeve. Since the tubular member is capped, when it is driven into the fixed surface portion, each sleeve piece is configured to expand from the portion that enters inward from the surface of the fixed surface portion by a predetermined distance, and Even when it is struck on the fixing surface portion made of a relatively small material, the surface portion around the driving portion does not collapse and can be securely fixed to the fixing surface portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an anchor bolt according to the present invention and showing a state before driving into a fixing surface portion.

FIG. 2 is a perspective view showing an embodiment of an anchor bolt according to the present invention and showing a state in which a fixing member is fixed to a fixing surface portion.

FIG. 3 is a perspective view showing an embodiment of an anchor bolt according to the present invention and showing a state after driving into an anchoring surface portion.

FIG. 4 is a perspective view showing an embodiment of a conventional anchor bolt and showing a state before driving into a fixing surface portion.

FIG. 5 is a perspective view showing an example of a conventional anchor bolt and showing a state after the anchor bolt is driven into a fixing surface portion.

[Explanation of symbols]

10 Bolt Main Body 11 Shaft Part 12 Covering Part 13 Base End Part 14 Head Part 15 Screwing Part 16 Anchor Bolt 17 Fixing Surface Part 18 Locking Piece 19 Locking Piece 20 Flange Part 21 Fixing Hole Part 22 Anchor Bolt 23 Bolt Main Body 24 Shaft Part 25 Head 26 Sleeve 27 Thread Groove 28 Threaded Part 29 Flange 30 Slit 31 Sleeve Piece 32 Large Diameter Part 33 Fixed Member 34 Void 35 Hole 36 Inner Surface 37 Outer Surface 38 Rib (Rotation Protrusion) 39 Gypsum Board (Fixing Surface) 40 Fixing Hole 41 Anchor Bolt 42 Metal Cylindrical Member 43 Rotation Stopping Piece 44 Hole 45 Front Tip 46 Front Tip 47 Rear End 48 End

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Kaneko 184-1, Maioka-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture, Nifco Co., Ltd. (72) Inventor, Hitoshi Terashima, 184-1, Maioka-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Nifco, Inc. Within

Claims (1)

[Claims] 1. An anchor bolt driven into a fixed surface portion, comprising: a bolt main body; and a sleeve that is mounted on a shaft portion of the bolt main body and can be temporarily fixed to the fixed surface portion. The shaft is formed in a cylindrical shape and made of a flexible material, and the shaft portion of the bolt body is rotatably inserted therein. The shaft portion of the bolt body is formed on the inner peripheral surface portion at the tip end side thereof to form the shaft. A plurality of slits that form a sleeve piece along the axial direction and that have a threaded portion that is threadedly engaged with the thread groove of the portion, and that are spaced apart from the head-side end of the bolt body of the sleeve at a predetermined interval. Is provided, and a metallic cylindrical member having a predetermined width dimension is capped between the end portion on the head side of the sleeve and the sleeve piece, and is embedded in the fixed surface portion. Is a screw temporarily fixed to the fixing surface. Rotate the bolt body inside the sleeve to bulge each sleeve piece outward from the shaft between the front and rear ends of the sleeve piece to expand each sleeve piece and fix it inside the fixed surface. Anchor bolt characterized by being installed.