DE29919502U1 - Blind rivet - Google Patents

Description

· · I

PALGEN, SCHUMACHER & I&rtilN : : ·"······:

DÜSS*ELDORF ESSEN

PATENT ATTORNEYS

our reference: 99 311 G/sch Düsseldorf .5 November 1999

MERITOR Automotive GmbH Hanauer Landstrasse 338

D - 60314 Frankfurt am Hain

Blind rivet

The invention relates to a blind rivet of the type corresponding to the preamble ..- of claim 1.

; Such blind rivets, which are particularly suitable for blind riveting

used according to the pop method, enable a

simple, fast and economical connection of two

™ or several material sheets. The actual rivet

process according to the Pop process, the material sheets are irreversibly connected to each other by the plastic deformation of the rivet on the blind side, since this

; deformation on the blind side a locking head as

corresponding counterpart to the setting head on the working

side. The material sheets are thus separated from the

j Rivets are joined together by the respective heads

! 15 pressed and held.

If the rivet connection has to be removed, for example for service purposes,

! be loosened, the rivet must be removed in a complex and time-consuming manner, for example by drilling ; 20. In this case, the rear part of the rivet falls into the

D^0239 DÜSSBLUOfcF MUbYA^SnlAkSEa.TEX.EFQN.^nZn.AK 145 *-&Lgr; * TELEPHONE 49 / 211 / 96 145 - 20 D-45133 ESSßt iföuHLINGCTRASSE °43 A TELEPHONE 49 / 201 / 84 230 - 0 · TELEPHONE 49 /201/84 230 - 20

POSTBANK COLOGNE (bank code 370 100 50) 115 211 - 504

Blind area and remains there. This can lead to noise from remaining moving rivet parts. Furthermore, the rivet parts in the blind area can cause corrosion of the other components because their protective layer is destroyed due to drilling. Furthermore, the rivet must be reinserted to restore the connection.

The object of the invention is therefore to provide a generic blind rivet in a simple manner which enables a simple reversible removal of the rivet connection after the riveting process.

This object is achieved by a blind rivet having the features of claim 1.

According to the invention, it has been recognized that the rivet connection can be made detachable by the multi-part design of the setting head of the blind rivet and the removable design of one of the parts of the setting head.

The setting head therefore preferably consists of two parts that can be screwed together. The first part is designed as a threaded section of the rivet. The second part, designed as a nut, is screwed onto this. Together they form the setting head on the working side of the sheets to be joined. After the riveting process, the top sheet can be removed by unscrewing the nut, while the rivet remains in the sheet below together with the threaded section. For this purpose, it is necessary that the threaded section of the rivet has a larger diameter than the rivet part protruding onto the blind side before riveting and that the hole in the upper material sheet has a diameter corresponding to the section with the thread. The threaded section thus engages

Section of the rivet passes through the hole in the top sheet and rests on the sheet underneath. When riveting, the rivet is attached to the lower sheet and the upper sheet is held in place by screwing the threaded section of the rivet to the nut. The threaded section essentially forms a setting head for the lower sheet, whereas the threaded section together with the nut forms the complete setting head.

Therefore, the material sheets can be easily separated from each other by loosening the nut without much effort. This eliminates the need for time-consuming steps to remove the rivet and leaves no residue behind.

To restore the connection, the nut only needs to be screwed back on. There is no need to re-rivet it, as is the case with a normal rivet, because the actual rivet connection remains, i.e. a kind of stud bolt is riveted to the lower sheet, to which the upper sheet is screwed, and this can be done in one step.

Further details, features and advantages of the present invention will become apparent from the following description of the accompanying drawings. They show:

Fig. 1 shows a blind rivet according to the invention before riveting in a side view, partly in

longitudinal section;

Fig. 2 the blind rivet from Fig. 1 after the riveting process in side view; and
35

• *

Fig. 3 is an exploded view of the disassembly of the rivet connection from Fig. 2.

Fig. 1 shows a blind rivet, designated overall by 10, for riveting using the pop method before riveting. The rivet comprises a first section 3 which extends through the hole 7, which is preferably polygonal to prevent rotation, through the lower sheet 1. The blind rivet 10 also has a second section 4 with a thread 12 which has a larger diameter than the first section 3 and extends through the corresponding hole 8 in the upper sheet 2 and rests on the lower sheet 1. A corresponding nut 9 is screwed onto the thread 12 of this section 4. The nut 9 forms the setting head together with the section 4. This nut is screwed on far enough that the thread-bearing section 4 rests on the lower sheet 1 and the nut 9 simultaneously rests on the upper sheet 2.

During the actual riveting process, the tear-off pin 5 is pulled upwards by the rivet pliers or the like and the mushroom-shaped head 6 connected to it is thus pulled in the direction of the working side A, whereby the first section 3 located on the blind side B is plastically deformed. This deformation increases the diameter of the section 3 beyond that of the corresponding hole 7. The rivet 10 is thus now firmly connected to the lower sheet 1. If the tensile force acting on the tear-off pin 5 exceeds a force defined by a predetermined breaking point attached to it, it breaks off. The riveting process is thus ended, as shown in Fig. 2.

The rivet 10 thus forms a kind of stud bolt in the lower sheet 1, onto which the sheet 2 is fastened by means of the thread 12 by screwing on the nut 9. For this purpose, the sheet 2 has a hole 8 with the diameter of the

·

second threaded section 4 of the rivet. The nut 9 presses the sheet 2 against the sheet 1.

As described above, the riveting process can be carried out with the nut 9 screwed on to simplify the work, so that the two sheets 1 and 2 are connected in one operation. This is advantageous because it does not change the usual way of working with rivets. Alternatively, the rivet 10 can of course be connected to the sheet 1 first, then the sheet 2 with the hole 8 can be placed on the rivet 10 and then fastened using the nut 9 via the thread 12 of the threaded section of the rivet 10.

As shown in Fig. 3, the connection thus obtained can be easily released. To do this, the nut 9 is unscrewed from the threaded section 4 of the rivet 10 and the upper sheet 2 is lifted off. The actual rivet 10 remains in the lower sheet 2. There it forms a type of stud bolt that can be attached by riveting in a simple manner, for example without complex welding. In this way, parts that later have to be separated again if necessary and that were previously connected by screwing, for example, can be connected to one another by simple and economical riveting.

REFERENCE SYMBOL LIST - 99

1 1. Sheet (lower)

2 2nd sheet (top)

3 Section 1

4 first part of the setting head

5 Tear-off pin

6 mushroom-shaped head

7 Hole 1

8 Hole 2

9 Nut, second part of the setting head

10 blind rivet

11 Setting head

12 threads

A Working page

B Blind side

n?" ν mm 1 ^: "i ⁵ ^ ff/ ! i

Claims (6)

1. Blind rivet (10) for blind riveting at least two material sheets (1, 2) according to the pop method with a first section (3), a setting head (11), a tear-off pin (5) and a mushroom-shaped head (6), characterized in that the setting head (11) of the blind rivet (10) is designed in several parts, wherein the rivet connection of the at least two material sheets (1, 2) is designed to be reversibly detachable by removing a part (9) of the setting head (11). 2. Blind rivet (10) according to claim 1, characterized in that the setting head (11) consists of a first part (4) and a second part (9) which are detachably connected to one another. 3. Blind rivet (10) according to claim 2, characterized in that the parts (4, 9) of the setting head (11) are screwably connected to one another. 4. Blind rivet (10) according to claim 3, characterized in that the first part (4) of the setting head (11) is formed by a second portion of the blind rivet (10) and has a thread (12). 5. Blind rivet (10) according to claim 4, characterized in that the second part (9) of the setting head (11) is designed as a nut (9) which can be screwed onto the thread (12) of the first part (4). 6. Blind rivet (10) according to one of claims 1 to 5, characterized in that the second section of the blind rivet (10) has a larger diameter than the first section (3) of the blind rivet (10).