DE2935369A1 - FASTENING ELEMENT - Google Patents

Description

A. RAYMOND, 7850 Loerrach RG 378

8/30/1979

Fastener

The invention relates to a two-part fastening element for the detachable connection of plate-shaped parts, consisting of an anchoring part with a retaining collar and two expansion tabs which can be inserted into the square fastening holes of the panels to be connected and anchored therein is provided and from an insertable into the anchoring part expanding part, which has a rotating head, a rectangular cross-section Expansion bolts for pushing the expansion tabs apart and a cylindrical one connecting the rotating head with the expansion bolt Has neck, wherein in the retaining collar of the anchoring part a rectangular recess from the cross section of the expansion bolt and in the center of this recess on the long sides circular cutouts corresponding to the diameter of the neck are provided and further ending on the transverse sides of the expansion bolt at a distance from the underside of the rotary head Spring legs are arranged, the shoulders of which when the neck is immersed in the circular cutouts under the collar edge snap into place.

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Such fasteners are used to plate-shaped To connect parts together so that they can be quickly released at any time.

One such is from the German utility model 6 908 401 Fastening element is known in which a flattened expansion bolt made of plastic is inserted into a metallic plug-in socket will. The expansion walls of the plug-in socket are here starting from the retaining collar over about a third of the total length slightly bent outwards and from then on brought together again to the end in such a way that the walls are twisted of the inserted expansion bolt are pushed apart.

The fastening process takes place in such a way that the plug-in socket is inserted into the rectangular hole of the carrier plate, the expansion tabs when passing through the mounting hole first compress and then spring apart again, whereby the plug-in socket is held in the carrier plate. Then the expansion bolt is inserted into the rectangular hole in the plate of the retaining collar until the spring legs are behind the collar edge snap into place. The square hole of the plate to be attached to the carrier plate can now be pressed onto the expansion tabs and the expansion bolt are rotated by 90 °, whereby the expansion tabs are pressed outwards and the two plates are firmly against each other be anchored. If you want to separate the two plates from each other again, this is done by simply turning them back

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of the expansion bolt possible by 90 °. The spreading flaps can then press together again and remove the plate from the carrier plate again.

However, this anchoring system has the disadvantage that the two Parts are made of different materials and therefore have to be brought together by hand. Also is introducing the metallic plug-in socket in the fastening holes as well as the detachment associated with a considerable expenditure of force, which is also perceived as a disadvantage.

The object of the invention is seen in the aforementioned fastening element to the effect that the manufacture is simpler and cheaper and the assembly and disassembly more problematic can be carried out.

According to the invention, this object is achieved in that the expansion part and anchoring part made of the same hard-elastic plastic and integrally with one another by means of tear-off pouring points are connected, and that the outer walls of the expansion tabs in the area under the rotary head run parallel to each other, so that the plug-in socket can be inserted into the fastening holes of the panels to be connected without resistance.

Another improvement over the known fastener is achieved in an embodiment of the invention that the rectangular recess in the collar of the anchoring part with its longitudinal axis cruer to the laterally resilient expansion tabs.

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is directed, so that with the pressing of the expansion bolt at the same time the expansion flaps are pressed apart.

In the drawing, an embodiment of the invention is shown, which will be explained in more detail below. It shows:

Fig. 1 shows a fastening element made of plastic in a side view with a section through the Anchoring part,

2 shows the fastening element in a front view,

3 shows a section through the cylindrical neck of the expansion part according to III - III in FIG. 2,

4 shows a section through the expansion bolt according to IV-IV in FIG. 1,

5 shows the fastening element before insertion

into the fastening holes of the panels to be connected,

6 shows the fastening element after it has been inserted into the fastening holes in the anchoring position and FIG

7 shows the fastening element in the release position.

The fastening element shown in the figures consists essentially of an anchoring part 1 and one in this insertable spreaders.il 4. Both parts are in a common

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Men casting mold made of hard elastic plastic and integrally connected to one another by tearable pouring points or webs 12 .

The anchoring part 1 consists of a preferably square retaining collar 2 with a rectangular recess in its center and on both sides of the recess 9 on the transverse sides approximately at right angles protruding elastically springable expansion tabs 3 and 3 '"These are below the retaining collar 2 with parallel mutually extending outer walls 13 and 13 "provided to the conically converging approximately in the lower third of the expansion tabs 3 and 3 " Connect the insertion surfaces 19 and 19 ', the associated inner walls 20 and 20 ° likewise being conical in this area converge.

The expansion part 4, on the other hand, has a square expansion bolt 7 with the same cross section as the rectangular recess 9. This expansion bolt 7 is bevelled in a wedge shape at its lower end and connected to a rotating head 5 at its upper end, through which the expansion bolt 7 can be pressed into the anchoring part 1 by the fitter and rotated therein.

For this purpose, the rotating head 5 is provided with a flat part 21 which can be clamped between the thumb and forefinger of the fitter is equipped with grooves 22 for better gripping. Below the flat part 21 is a round support plate 23, which when pressing in the expansion bolt 7 on the top of the retaining

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collar 2 rests. The expansion bolt 7 is about a in cross section reduced intermediate piece 24 and an adjoining cylindrical neck 6 connected to the rotary head 5 « On the two transverse sides of the expansion bolt 7 are approximately at the level of the intermediate piece 24 elastically compressible Spring legs 8 and 8 ″, which when the expansion bolt 7 is pressed into the recess 9 with their shoulder surfaces 25 under the edge of the retaining collar 2 so that the expansion bolt / is locked in the depressed position. For this purpose are at the center of the rectangular recess 9 on the longitudinal sides of circular cutouts 10 and 10 'are provided, which for receiving and rotatable Storage of the neck 6 are used.

As can be seen from FIGS. 5-7, the fastening element is intended to hold two one on top of the other or one against the other To connect plates 15 and 16 to one another in an easily detachable manner. For this the anchoring part · 1 with the two expansion tabs 3 and 3 'into the holes 14 and 17 of the two, which are brought exactly one above the other Plates 15 and 16 inserted and the expansion bolt 7 at the same time Tearing off the pouring points 12 pressed in, so that the inner walls 20 and 20 'are pressed apart. As a result of this the outer walls 13 and 13 'will be on the back of the counter plate 16 against the edge 18 of the hole 17 form-fit, whereby the two plates 15 and 16 on this Ste ^ e safe are connected to each other.

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If you want to detach the plates 15 and 16 from each other again, so A simple turn of the rotary head 5 by 90% is sufficient and the expansion tabs 3 and 3 * return to their original position, so that the entire fastener from the holes 14 and 17 can be pulled out »

In order to make the fastening process as quick and easy as possible, the recess 9 is in the collar 2 with its longitudinal axis aligned transversely to the expansion tabs 3 and 3 ″ so that the latter are immediately pressed apart when the expansion bolt 7 is pressed in will"

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Claims (1)

A. RAYMOND, 7850 Lörrach RG 378 August 30, 1979 patent claims; 1. Two-part fastening element for detachable connection of plate-shaped parts, consisting of an anchoring part, with a retaining collar and two that can be inserted into the square mounting holes of the panels to be connected and expansion tabs which can be anchored therein and consists of an expansion part which can be introduced into the anchoring part, which has a rotating head, an expansion bolt with a rectangular cross-section for pushing the expansion tabs apart and a, the rotating head with the expansion bolt connecting cylindrical neck extension on v / eist, with the retaining collar of the Anchoring part a rectangular recess from the cross section of the expansion bolt and in the center of this recess on the Long sides circular cutouts are provided corresponding to the diameter of the neck attachment and furthermore on the outer sides of the expansion bolt are arranged at a distance from the underside of the rotating head ending spring legs, the shoulders of which snap into the circular cutouts under the collar edge when the neck base is immersed, characterized in that anchoring part (1 / and expansion part (4) made of the same hard-elastic plastic and by tear-off pouring points or 13 0 013/0611
ORIGINAL WSPECTED Webs (12) are integrally connected to one another and that the outer walls (13) of the expansion tabs (3) run parallel to one another in the area under the rotary head (5). 2. Fastening element according to claim 1, characterized in that the rectangular recess (9) in the collar (2) of the anchoring part (1) is aligned with its longitudinal axis transversely to the expansion tabs (3). 1 30013/061 1