DE8809332U1 - Plastic seal - Google Patents

Description

Description Plastic seal

The innovation relates to a plastic seal according to the preamble of claim 1.

Plastic seals of the aforementioned type are known in which, when inserted through the holes of the two components, the
The end of the shaft that protrudes over one of the holes is deformed when exposed to heat. This creates a thickening at the end of the shaft whose diameter is larger than the diameter of the hole. This has the disadvantage that the thickening at the end of the shaft has to be produced in a separate process by hot forming. To remove the seal, it is necessary to either separate the thickening from the shaft or place a sharp-edged object between the one component and the head so that the head can be separated from the shaft. Removing such a seal is therefore difficult.

The task is to design the plastic seal in such a way that sealing and releasing the seal can be carried out easily and that a released seal can be easily identified.

This problem is solved with the characterizing features of claim 1. Advantageous embodiments can be found in the subclaims.

An example of an implementation is explained in more detail below using the drawing. It shows:

Fig. 1 a side view of the plastic seal with cut slice
seen in the direction of arrow I in Fig. 3;

Because the thickening 9 has an approximately circular conical shape, it is not possible to see from the outside, as shown in Fig. 3, that the shaft 4 is connected to the disk 12.

Fig. 2 a side view of the shaft end

with cut slice, seen in
Arrow direction II according to Fig. 3 and

Fig. 3 is a plan view, seen in the direction of arrow III in Fig. 1.

The plastic seal is used to connect two components 1, 2, each of which has a hole 3. The shaft A of the seal is inserted through these two holes. The head 5 is integral with the shaft A, with a cut 6 provided between the shaft A and the head 5, which represents a predetermined breaking point between the head and the shaft. The head 5 has a screw slot 7. The shaft A has a square cross-section 8. At the end of the shaft A there is a thickening 9, which has approximately the shape of a circular cone. The base circle of this circular cone intersects the corners 10 of the square cross-section 8 of the shaft, so that an undercut 11 is formed between the corners 10.

If the shaft A is inserted through the holes 3, a disk 12 is placed on the end of the shaft, which has a hole 13 whose cross section is equal to the cross section 8 of the shaft A. This disk 12 is placed on until the edge of the hole 13 is gripped by the undercut 11, whereby the disk 12 is locked to the shaft 4. The two components | 1,2 are now held between the head 5 and the disk 12. M

Fig. 3 shows, not visible from the outside, in what way %

The disk 12 has a square outer circumference 14. At least one elevation 15 is provided on the component 2, which prevents the disk 12 from being rotated. If the pawl of a screwdriver is placed in the slot 7 and an attempt is made to rotate the head 5, such rotation is prevented by an edge of the disk 12 resting on the elevation 15. Since the disk 12 and the shaft 4 are firmly connected to one another, if an attempt is made to rotate the head 5, it is sheared off the shaft 4 at the predetermined breaking point 6. The seal is thus destroyed, falls apart and cannot be reused.

Claims (1)

••■tr· ·» · Expectations 1. Plastic seal for connecting two components via a bore through a shaft which is integral with a head, characterized in that the end of the shaft has a thickening (9) with an undercut (11), a disk (12) with a bore (13) is provided, into the bore (13) of which the thickening (9) can be inserted until it is locked by the undercut (11) and the bore (13) of the disk (12) and at least the area of the shaft adjoining the undercut (11) (4) have a cross-sectional shape (8) which deviates from the circular shape and is rotationally secure. 2. Plastic seal according to claim 1, characterized in that between the shaft (4) and the head (5) a predetermined breaking point is provided in the form of a notch (6) in the shaft (4). 3. Plastic seal according to claim 1 or 2, characterized in that the disc (12) has an outer circumference (14) deviating from the circular shape. 4. Plastic seal according to one of claims 1 to 3, characterized characterized in that the head (5) has a screw j; slot (7). % 5. Plastic seal according to one of claims 1 to 4, characterized characterized in that the thickening (9) is symmetrical } to the shaft axis. 6. Plastic seal according to claim 5, characterized shows that the thickening (9) is a circular cone. ■ · I ■ * 1 > 7. Plastic seal according to one of claims 1 to 6, characterized in that the shaft (4) and the bore (13) of the disc (12) have a square cross-section (8). 8. Plastic seal according to claim 7, characterized in that the base circle of the circular cone-shaped thickening (9) intersects the corners (10) of the square QL-section (8). 9. Plastic seal according to claim 3, characterized in that the outer circumference (14) of the disc (12) is rectangular.