JPH09242728A - Blind rivet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform aligning work and fixing work with one fixing tool by forming a bore to have a large diameter in a first part close to the flange of a shank, an intermediate diameter in a second part and a small diameter in a third part away from the flange. SOLUTION: The bore of the shank 2 of a rivet nut 1 is composed of a first part 5 having a large diameter, a second part 6 having an intermediate diameter and a third part 7 having a small diameter. When a pulling rod 14 is inserted into the rivet nut 1 and the nose piece 13 of a tool is brought into contact with a flange 3, a screw member 15 is engaged with a screw 10. The lower side of the flange 3 is placed on a first seat body 12, the shank 2 is inserted into the hole 16 of the seat body 12, the pulling rod 14 is pulled into the nose piece 13 and then the shank is compressed. Since a wall thickness is smallest in the first part 5, a first expanded part 11 is formed and the seat body 12 is fixed between the flange 3 and the expanded part 11. Similarly, a second expanded part 19 is formed by deforming the second part 6 and a second seat body 20 is fixed. Thus, aligning work and fixing work are performed by one fixing tool.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to rivets, and more particularly to blind rivets.

[0002]

BACKGROUND OF THE INVENTION Rivet nuts are used to make threaded attachments to sheet material. The known rivet nut is
It consists of a body with a bore having an internal thread and a flange at one end. A screw member is placed in the nut. Then
The nut is placed in the seat hole and the flange is applied to the seat. Next, the screw member is rotated to bring the tubular body into compression. A portion of the tubular body deforms to secure the sheet between the flange and the deformed portion of the tubular body. A portion of the internal thread is not deformed and the screw member can be rotated in the opposite direction to remove the screw member from the deformed rivet nut. The undeformed internal thread portion can be used as a mounting point for mounting another seat body by using a screw member having an appropriate thread. An example of this type of rivet nut is European patent 0,
531,634 A.

This type of rivet nut has the disadvantage that it can only be mounted once on the blind side of the seat and fixed to the seat. In many industries, there is a need for fastening methods that can be reliably mounted in one or more locations.
Further, for example, in the automobile manufacturing industry, there is a demand for a plug-in connector for positioning and aligning in the work of accurately aligning and assembling two metal sheet components. When this work is complete, the sheets are often secured to each other using separate fasteners to complete the assembly. Further parts will then be added to the assembly. It would be advantageous if the aligning work and the fixing work could be performed with a single fixture.

[0004]

SUMMARY OF THE INVENTION The present invention recognizes the above-mentioned problems in the conventional rivet nut, and should solve the problem of providing a blind rivet capable of performing the aligning operation and the fixing operation with a single fixture. It is an issue.

[0005]

In one aspect, the present invention comprises a shank, the shank having a flange at one end, wherein a bore extending from the flange to the shank is formed, the shank being remote from the flange. A blind rivet having threads formed in at least a portion of the bore, wherein the bore has a large diameter in a first portion of the shank near the flange, and in a second portion of the shank, The bore has an intermediate diameter,
A third part of the shank remote from the flange provides a blind rivet characterized in that the bore has a small diameter. Adjacent portions of the bore are preferably separated by shoulders. In a second aspect, the invention provides a method of fixing a first body to a second body using a rivet according to the first aspect, comprising: (a)
Inserting the rivet into the hole of the first body, (b) deforming the first portion of the shank to fix the first body between the first portion and the flange, and (c) the second body. Passing the shank of the rivet through the hole, and (d) deforming the second part of the shank to fix the second body between the first part and the second part. A method is provided.

Use of a threaded member having a head and threading the threaded member through a hole in a third body to engage a screw on a rivet to secure the third body between the head and the flange. Is preferred. The invention will now be described by way of example only, with reference to the embodiments shown in the drawings.

[0007]

1 shows a rivet nut consisting of a body with a shank 2 having a substantially constant outer diameter, a flange 3 at one end of the shank, and a bore 4 extending from the flange to the shank. There is. The shank 2 comprises three main parts, a first part 5 having a large diameter bore, a second part 6 having an intermediate diameter bore, and a third part 7 having a small diameter bore. Shoulders 8 and 9 separate adjacent portions. A thread 10 is formed in the bore of the third portion over at least a portion of its length. In use, the lower side of the flange 3 is applied to one surface of the first seat body 12 to which the rivet nut is attached. Known rivet nut setting tools can be used to set the rivets. As shown in FIG. 2, a pull rod 14 having a screw member 15 is inserted into the rivet nut while being rotated, and when the nose piece 13 of the tool hits the flange 3, the screw member 15 engages with the screw 10.

The lower side of the flange 3 is the first seat body 12
Then, with the shank 2 of the rivet nut 1 inserted in the hole 16 of the first seat body, the pull rod is pulled into the nose piece of the tool to compress the shank. Since the wall thickness is smallest in the first part 5, buckling or collapsing occurs here and the first bulge 11 is formed. Seat body 1
2 is thus fixed between the flange 3 and the first bulge 11. The second bulge 19 is formed using a second tool, actually the first tool with another nosepiece. The tool comprises a pull rod 14 'having a threaded member 15' extending from within the nosepiece. The nosepiece 18 is cylindrical and is inserted into the bore during use until it strikes the shoulder 8 between the first and second portions 5, 6 of the bore. The screw member 15 is screwed into the third portion and engaged with the screw 10.

The second sheet 20 is the second sheet 20.
It is placed on the shank 2 by means of the hole 21 inside. The rivet shank is formed with a beveled end 27 at the end remote from the flange 3 which helps to place the second sheet 20 on the rivet shank 2. In this way, the rivet acts as a bayonet for supporting and temporarily positioning the second sheet 20. When the tool is activated, the pull rod 14 is retracted again, compressing the rivet nut. At this time, the undeformed portion of the second portion 5 of the shank is supported by the nose piece 18 of the tool, and the second portion 6 of the shank deforms to form the second bulge portion 19. In FIG. 5, the second seat body is shown being supported between the first and second bulges.

FIG. 6 shows a state in which the third sheet member 22 is attached to the assembly of the first and second sheet members by a screw fastener. The fastener has a head 24 and a threaded shank 25. This threaded shank is inserted through the hole 26 in the third sheet member 22 and engages the screw 10 in the third part of the rivet. The fastener can then be tightened to secure the third sheet member 22 between the fastener head 24 and the third portion of the rivet. In order to further facilitate the positioning of the second seat body, the rivet nut has a beveled end 27 (see FIG.
To FIG. 5), a tapered conical end 26 (FIG. 6) can be formed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rivet nut according to a first aspect of the present invention.

FIG. 2 is a cross-sectional view showing a state where the rivet nut is placed at one end of a mounting tool.

FIG. 3 is a cross-sectional view showing a state in which a rivet nut is attached to a first seat body.

4 is a cross-sectional view showing one end of the mounting tool in the rivet nut of FIG.

5 is a cross-sectional view showing a state in which the rivet nut of FIG. 3 is attached to a second seat body.

6 is a cross-sectional view showing a screw member used to attach a third seat body to the assembly of FIG.

FIG. 7 shows the rivet nut of FIG. 1 with rounded ends.

[Explanation of symbols]

1 ... Rivet nut, 2 ... Shank, 3 ...
Flange, 4 ... Bore, 5 ... First part, 6 ...
Second part, 7 ... Third part, 8, 9 ... Shoulder part, 10
... Screw, 12 ... First seat body, 14 ...
Pulling rod,

Claims (7)

[Claims] 1. A shank having a flange at one end formed with a bore extending from the flange to the shank, wherein at least a portion of the bore remote from the flange is threaded. In a blind rivet, the bore having a large diameter in a first portion of the shank near the flange and the bore having an intermediate diameter in a second portion of the shank, Blind rivet characterized in that in the third part of the shank remote from the flange, the bore has a small diameter. 2. The blind rivet according to claim 1, wherein adjacent portions of the bore are separated by shoulder blinds. 3. The blind rivet according to claim 1, wherein the rivet end farther from the flange is tapered or frustoconical. 4. One of claims 1 to 3
A method of fixing a first body to a second body by using the rivet described in the item (a) inserting the rivet into the hole of the first body, and (b) deforming the first portion of the shank. And fixing the first body between the first part and the flange, (c) passing the shank of the rivet through the hole of the second body, and (d) deforming the second part of the shank to change the first part. Fixing the second body between one part and the second part. 5. A method for fixing a first body, a second body and a third body to each other by using the steps according to claim 4, wherein (e) the hole of the third body is aligned with the hole of the rivet, (f) A screw member having a head portion is inserted into the bore through the hole of the third body, and the screw member is engaged with the screw so that the third body has the head portion and the flange. Fixing between the two. 6. A blind rivet as shown in the accompanying drawings and described with reference to the drawings. 7. A method of securing a body as shown in the accompanying drawings and described with reference to the drawings.