JPH1113719A - Expansion rivet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize fastening dissolving a problem for the occurrence of idling rotation during fastening and not needing a tool for exclusive use, in a rivet body consisting of a bolt body and an expansion sleeve body. SOLUTION: In an expansion rivet formed such that a cylindrical expansion sleeve body having a slit in an axial direction and a bolt body provided at a tip with an expanding boss part are inserted in the cylinder hole of the expansion sleeve body, an expansion boss part 3 formed at the tip of a bolt body 4 has a slope 9 having four surface or more into which the rear end side is divided by edges 12 and the tip of the cylindrical expansion sleeve body is provided with the same number of opening slits in positions situated facing the edges formed in the rear end of the bolt body. By rotating a nut thrededly engaged with a bolt body by an ordinary tool, expansion of the sleeve body is realized without idling rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener used for joining a plurality of metal plates by superimposing them or attaching equipment to the metal plates. Rivets that can be joined only by work from

[0002]

2. Description of the Related Art When a tool can be inserted into the back surface, a method of caulking by pressing a rivet having a head at one end from the tip and the head side is common, but from the front side in a hollow portion. A blind type rivet in which a pin is inserted into a main body having a cylindrical shaft portion is used for the work, or a cylindrical expansion sleeve that can be expanded by being divided by a slit (split groove) is used for a bolt or a nut. Some of them were attracted by rotation and compressed and deformed.

[0003]

In the case of joining that requires high strength, a joint that expands and deforms a cylindrical expansion sleeve by the rotational force of a nut is often used.
In the present invention, such a problem that occurs in the rivet body that expands and deforms the expansion sleeve, that is, when rotating the nut, the rivet body itself can not expand due to idling motion, so a special tool is used. This focuses on the problem that it is necessary to rotate the nut while fixing a part of the bolt.

[0004] Due to this problem, the user must prepare special tools, which hinders work at various fastening sites.

[0005]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a bolt having a cylindrical expansion sleeve having a slit in the axial direction and a boss having an enlarged diameter at the tip. In an expansion rivet in which a body is inserted into a cylindrical hole of an expansion sleeve body, an enlarged boss portion formed at a tip of the bolt body has four or more inclined surfaces whose rear end side is divided by an edge. Adopts a configuration in which a slit that opens to the tip side is formed.

According to a second aspect of the present invention, there is provided an expansion rivet in which a cylindrical expansion sleeve having a slit in the axial direction and a bolt having a boss portion whose diameter is enlarged at the tip are inserted into a cylindrical hole of the expansion sleeve. The enlarged diameter boss portion formed at the tip of the bolt body has four or more inclined surfaces whose rear end side is divided by an edge, and the expansion sleeve body has a slit opening to the front end side and a slit opening to the rear end side. Of the rear end of the sleeve body divided by the slit opened to the rear end side, the sleeve body gradually expands toward the rear end direction of the sleeve body at the end opposite to the screw tightening direction. This adopts a configuration in which inclined claws are formed.

According to a third aspect of the present invention, there is provided an expansion rivet comprising a cylindrical expansion sleeve having a slit in the axial direction, and a bolt having a boss portion having an enlarged diameter at a tip inserted into a cylindrical hole of the expansion sleeve. The enlarged diameter boss portion formed at the tip of the bolt body has four or more inclined surfaces whose rear end side is divided by an edge, and the expansion sleeve body forms a slit that opens to the tip side, and a cylindrical expansion sleeve. At the tip of the body, the same number of open slits are provided at positions facing the edges formed at the rear end of the bolt body.

According to a fourth aspect of the present invention, there is provided an expansion rivet in which a cylindrical expansion sleeve having a slit in the axial direction and a bolt having a boss portion whose diameter is enlarged at the tip are inserted into a cylindrical hole of the expansion sleeve. The enlarged diameter boss portion formed at the tip of the bolt body has four or more inclined surfaces whose rear end side is divided by an edge, and the expansion sleeve body has a slit opening to the front end side and a slit opening to the rear end side. Of the rear end of the sleeve body divided by the slit opened to the rear end side, the sleeve body gradually expands toward the rear end direction of the sleeve body at the end opposite to the screw tightening direction. An inclined claw is formed, and a configuration is employed in which the same number of open slits are provided at the front end of the cylindrical expansion sleeve body at a position facing the edge formed at the rear end of the bolt body.

[0009]

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

In FIG. 1, a cylindrical expansion sleeve 1 having a slit 2 in the axial direction and a bolt 4 having a boss 3 whose diameter is enlarged at the end are inserted into a cylindrical hole of the expansion sleeve 1. An extended rivet, a nut 5 and various fixing means depending on the application are screwed to the rear end of the bolt body 4.

The enlarged boss 3 formed at the tip of the bolt 4
Has four or more inclined surfaces 9 whose rear end side is divided by an edge 12, and the expansion sleeve body 1 has a slit 2 opening to the front end side and a slit 2 'opening to the rear end side,
Of the rear end of the sleeve body divided by the slit 2 ′ opened to the rear end side, the end on the side facing the screw tightening direction (generally clockwise) is directed toward the rear end of the sleeve body. It is a rivet body formed with an inclined claw 8 that gradually expands.

As shown in FIG. 5, since the inclined claw 8 is expanded outward so as to be larger than the diameter of the insertion hole 11, the rivet body of the present invention is fastened to the fastening members 10, 10 '.
When inserted into the insertion holes 11, 11 'provided in advance in
The rear end side of the inclined claw 8 comes into strong contact with the inner wall surface of the insertion hole, and as shown in FIG. 2, the entire length of the sleeve body 1 cannot be completely inserted into the insertion hole 11.
Is strongly pressed to reduce the diameter and insert the entire length.

In use, as shown in FIG. 2, first, the rivet body of the present invention is fastened to the fastening members 10 and 10.
'Into an insertion hole 11 provided in advance.

In the illustrated example, a general hexagonal nut 5 is inserted into the rear end of the bolt body 4 in a lightly screwed state, and when the nut 5 is rotated by a tool such as an electric wrench, as shown in FIG. As shown in FIG. 7, the bolt body 4 is drawn and the tapered inclined surface 9 of the boss portion 3 is
From the tip side.

At this time, the bolt body 4 tries to rotate due to the movement of the rotating nut 5, and the sleeve body 1 also tries to rotate.

Conventionally, in the case of a known anchor with a sleeve known as an anchor for concrete as shown in FIG. 6, since the inside of a member such as concrete is clogged, after the anchor is inserted into the hole, By pushing in, the sleeve tip is expanded and brought into close contact with the concrete inner wall surface to prevent "idling",
In the case of a hollow member to which the present invention is applied, the tip of the sleeve is located in a space, and such a close contact state cannot be obtained. It is difficult to move to

In the case of the rivet body of the present invention, when the bolt body 4 tries to rotate in response to the rotation of the nut 5, the enlarged diameter boss portion 3 has four or more inclined surfaces 9 at its rear end side. Therefore, the edge portion 12 bites against the inner wall of the sleeve body 1 so that the sleeve body 1 can be prevented from rotating, and the sleeve body 1 can be further prevented from rotating and the sleeve body 1 can be easily expanded at the initial stage. Edge part 12 on the tip side of body 1
The same number of open slits may be provided at a position facing the.

Further, since the rear end of the slit has the inclined claw 8 which faces in the rotation direction, it comes into strong contact with the inner wall of the insertion hole 11 to form a meshing state, thereby preventing idling and preventing the rotation of the nut from rotating. It can turn to the expansion of the body 1.

When the slit 2 is pushed out from the tip side, the expansion of the sleeve body 1 causes the two fastening members 1
0, 10 'are in close contact with each other, and at the same time, as shown in FIG.
Moves forward and the entire length is forcibly pulled into the member as shown in FIG.

When the fastening by the rivet body of the present invention is completed, a stronger rotating force is applied to the bolt body 4, but as shown in FIG. 4, the sleeve body 1 is formed by the insertion hole 11 and the plurality of edges 12 of the inclined surface 9. It is strongly pressed and deformed, so that idling can be prevented.

As described above, when the nut 5 screwed to the rivet body of the present invention is rotated, the work is completed by bringing the two fastening members 10 and 10 'into close contact as shown in FIG.

[0022]

According to the present invention, in a case where a plurality of metal plates are overlapped and joined, or a device is attached to the metal plate, a rivet body which expands and deforms a cylindrical expansion sleeve by the rotational force of a bolt or a nut is used. According to the rivet body, there is an effect that a special tool is not required since it has a novel structure for preventing idling.

The sleeve of the present invention can be easily mass-produced by punching an outer shape such as a slit from a metal flat plate by a press manufacturing method, bending and forming an inclined claw, and winding the same into a cylindrical shape by the same manufacturing method. In some cases, one of the slits may have a continuous shape over the entire length of the sleeve.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a rivet body of the present invention.

FIG. 2 is a front view showing a state where the rivet body of the present invention is inserted into a member.

FIG. 3 is a front view showing a state in which the rivet body of the present invention is tightened.

FIG. 4 is an end view showing an insertion hole at the time of completion of tightening of the rivet body of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 1, showing a pilot hole provided in the member;

FIG. 6 is a front view showing a conventional anchor body having a slit.

[Explanation of symbols]

 1. Expansion sleeve body 2. Tip side slit 2 '. Rear end slit 3. Boss part 4. Bolt body 5. Nut 6. Connection part 7. Opening 8. Inclined claw 9. 11. tapered inclined surface Edge

Claims (4)

[Claims] 1. An expansion rivet comprising a cylindrical expansion sleeve having a slit in an axial direction and a bolt having a boss portion having an enlarged diameter at a tip inserted into a cylindrical hole of the expansion sleeve. The diameter-enlarged boss formed at the front end has four or more inclined surfaces whose rear end is divided by an edge, and the expansion sleeve is a rivet formed with a slit that opens to the front end. 2. An expansion rivet comprising: a cylindrical expansion sleeve having a slit in an axial direction; and a bolt having a boss portion having an enlarged diameter at a tip inserted into a cylindrical hole of the expansion sleeve. The diameter-enlarged boss formed at the front end has four or more inclined surfaces whose rear end is divided by an edge, and the expansion sleeve body has a slit that opens to the front end and a slit that opens to the rear end. Of the rear end portion of the sleeve body divided by the slit opened to the end side, an inclined claw that gradually expands toward the rear end direction of the sleeve body at the end opposite to the screw tightening direction at the end opposite to the screw tightening direction is formed. It is a riveted body. 3. An expansion rivet in which a cylindrical expansion sleeve having a slit in an axial direction and a bolt having a boss portion having an enlarged diameter at a tip thereof are inserted into a cylindrical hole of the expansion sleeve. The enlarged-diameter boss formed at the tip has four or more inclined surfaces whose rear end is divided by an edge, and the expansion sleeve forms a slit that opens to the tip, and is provided at the tip of the cylindrical expansion sleeve. Is a rivet body provided with the same number of open slits at positions facing the edge formed at the rear end of the bolt body. 4. An expansion rivet in which a cylindrical expansion sleeve body having a slit in an axial direction and a bolt body having a boss portion whose diameter is enlarged at a tip end are inserted into a cylindrical hole of the expansion sleeve body. The diameter-enlarged boss formed at the front end has four or more inclined surfaces whose rear end is divided by an edge, and the expansion sleeve body has a slit that opens to the front end and a slit that opens to the rear end. Of the rear end portion of the sleeve body divided by the slit opened to the end side, an inclined claw that gradually expands toward the rear end direction of the sleeve body at the end opposite to the screw tightening direction at the end opposite to the screw tightening direction is formed. The rivet body is characterized in that the cylindrical expansion sleeve body has the same number of open slits at the front end of the bolt body at a position facing the edge formed at the rear end of the bolt body.