Fixation element and method for its production

The subject matter of the invention and an inventive manufacturing method are explained below with reference to the drawing. Show it:

Fig. 1 is the front view of a he th embodiment of a fastener according to the invention,

2 is a side view of this fastener in the mounting position between two components,

FIG. 3 shows the section along line lll-lll of FIG. 1,

AT 400 477 Β

4 shows the front view of this fastening element during production between a first and a second casting process,

5 shows the section along the line VV of Fig. 4,

6 is a mold for carrying out the second casting process in a broken view,

Fig. 7 shows the front view of a second embodiment of a erfindungsgmäßen fastening element, and

FIG. 8 shows the section along the line Vlll-Vlll in FIG. 7.

The fastening element shown in FIGS. 1 to 3 has two circular support plates 10 and 11, which are arranged parallel to each other, wherein the support plate 10 has a smaller diameter than the Support plate 11 has. These two support plates 10, 11 are interconnected by a component 12 made of elastomeric material.

The support plate 10 is formed with a relatively narrow Einschnappteil 13, which at right angles from the side of the support plate 10, which is remote from the support plate 11, protrudes. In the extension of Einschnappteiles 13, a cylindrical locking pin 14 is provided, which can be driven into a coaxial inner channel 15 of the Einsdhnappteils 13. The support plate 10 is further on the side which is spaced from the Einschnappteil 13, with a sleeve 16, which extends coaxially to the channel 15 and extends through a central opening 17 in the larger support plate 11 through, ausgeiidet. The opening 17 is so much larger than the sleeve 16, that under normal operating conditions, a contact between the opening edge and the sleeve 16 is avoided. The support plate 11 is a compar Cherweise broad snap part 18 provided, which protrudes at right angles from the support plate 10 remote side of the support plate 11.

The Fig. 2 shows this fastener in a mounting position between a first component 19, for example a part of a refrigeration system frame, and a second component 20, eg a mounting plate of a refrigerant compressor. The locking pin, which is inserted into the Einschnappteil 13, pushes elastic bridges 13 a of the Einschnappteiles 13 apart. At the same time this locking pin reinforces the most sensitive part of the Einschnappteiles 13, namely the neck portion at the transition point to the support plate 10th

Fig. 2 shows an insertion position of the fastener in which the refrigeration system is vertical. However, if the refrigeration system lying horizontally, for example transported, there is a risk that the elastomeric part 12 of the fastener high voltages, eg Shearing stresses, is subjected. By the sleeve 16 such voltages are limited.

Such fasteners are pressed in the required number with their Einschnappteilen 13 and 18 in mounting holes of the two components 19 or 20. Then a locking pin 14 is driven into each Einschnappteil 13. Since an assembly of four fasteners takes about 10 to 15 seconds, this is achieved in comparison to conventional assembly methods, a great time savings.

The production of such a fastening element will be described below with reference to FIGS. 4 to 6. The workpiece 21 shown in FIGS. 4 and 5 is molded in one piece from solid plastic, eg polyamide, wherein the two support plates 10 and 11 are connected to each other by webs 22 and the locking pin 14 is connected to the Einschnappteil 13.

Then this workpiece 21 in one of two halves 23rd and 24 existing mold, which is iri the plane with the outside of the support plate 11 is inserted inserted. After the two halves of the mold are brought together, the two support plates 10 and 11 are moved apart axially to a predetermined distance, whereby the webs 22 are broken. The attachment of the two parts broken apart in the mold is effected inter alia by a plurality of protruding pins 23a in the mold half 23 and a sleeve 24a in the mold half 24. The remaining space in the mold 25 is on this example filled with a thermoplastic elastomer. After curing of this elastomer, the finished fastener can be removed from the mold.

The height of the fastener can be changed by increasing or decreasing the distance between the two support plates. It is possible to carry out the two mold halves 23 and 24 with axially displaceable parts, which a Änderun g allow the formation of the elastomeric part.

In the in Figs. 7 and 8 shown second embodiment, the same workpiece 21 is used. However, while the elastomeric member 12 is poured in the form of a flattened oval tube, wherein the two flat sides of the oval lie in the planes of the outer surfaces of the support plates 10 and 11. The semicircular parts of the oval tube give the elastomeric part 12 further elasticity. This design of the elastomeric member 12 makes it easier to change the shape of the elastomeric member for certain applications and allows the use of very different materials

AT 400 477 B with different elastomeric properties. The elastomeric member 12 is provided with holes 26 for the pins

23a provided.

In both embodiments, the elastomeric material extends around both sides of the support plates.

This makes it possible, thereby one cause mechanical connection between the hard plastic and the elastomer that the plates are provided with a number of small openings which form bridge spaces for the elastomeric material. Alternatively, molecular bonding can be effected between the hard plastic and the elastomer.