DE2159540A1 - SPIKE FOR MOTOR VEHICLE TIRES - Google Patents

Description

D'pi.-ri.y ». OSKAiV ICON IU patent attorney

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1'USiIcIRi :: Oil

2956

Karl Simon company, Schramberg

Spike for automobile tires

309 831/0014

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The main patent (patent application P 21 11 682.5)

relates to a spike for motor vehicle tires with a plastic sleeve which can be inserted into the motor vehicle tire and a plastic sleeve in a central, axial recess of the plastic sleeve inserted, self-adjusting anti-skid pin that extends over at least part of its length in the direction of its foot tapered, wherein the plastic sleeve has a form-fitting embedded wire helix coaxial to its recess.

This spike has the property that the anti-skid pin always readjusts automatically so that it the plastic sleeve and thus always protrudes approximately the same distance over the tire surface, regardless of the wear and tear the plastic sleeve and the tire.

The wire of the wire helix can, for example, be an iron or iron Be steel wire. Wire has a smooth surface - since it is produced by drawing, it has been shown that such smooth wire coils can move in the plastic during operation, especially with heavily worn spikes. To avoid this,

/ According to the invention, in the case of a spike of the type mentioned at the outset, it is provided that the surface of the wire coil is rough.

It was found that the roughness of the The surface of the wire helix is sufficient to ensure that the wire helix is no longer located, even under unfavorable circumstances in the plastic of the plastic sleeve, can move. The roughness can be created physically or chemically. Mechanical roughening has proven to be particularly useful

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proven by knurling or roughening, chemical roughening by phosphating, etching or galvanic roughening. Of course, other mechanical, physical or chemical methods for producing the roughness of the wire helix are also possible.

Instead of or in addition to the described measure according to the invention, the above-mentioned spike can be used Type according to the invention can also be provided for the same purpose, that the wire of the wire helix is inclined or transverse to its longitudinal direction extending recesses, preferably in the form has impressions produced by rolling, hammering or the like. The depressions or indentations can, for example in principle be similar to steel reinforcement for concrete, it being understood that in the spike according to the invention the wire of the wire helix is of much smaller size Cross-section as reinforcing steel is.

Instead of or in addition to one or more of the aforementioned Measures can be taken in the case of a spike of the type mentioned at the beginning for the same purpose it can be provided that the wire of the wire helix has a non-circular cross-section over its entire length and that the irregularities in the longitudinal direction of the wire extend in a spiral around the longitudinal axis of the wire. This spiral-shaped course of the out-of-roundness of the wire around its longitudinal axis in the longitudinal direction of the wire can, for example by turning the drawing die that produces the wire during the drawing process or by turning the wire supply reel take place during the feeding of the wire into the device bending it into wire coils. Such a spiral

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The shape of the roundness of a wire also arises, for example, if you hold the wire while it is still is straight and malleable, twisted when tensioned. A wire produced in this way can if it is a profile wire is called twisted profile wire. Such a twisted profile wire can preferably be used for production the wire helix can be provided. The profile cross-section can expediently be polygonal, for example square or hexagonal, or of any other polygon shape.

An exemplary embodiment of the invention is shown in the drawing. The drawing shows a longitudinal section a spike 1O, which consists of a with a rivet head-like Plastic sleeve 12 provided with a foot, one completely embedded in this plastic sleeve, as a cylindrical, metallic helical spring 13 formed wire coil and a conical anti-skid pin 14 made of hard metal.

The anti-skid pin 14 is in a continuous, central, rotationally symmetrical recess 15 of the plastic sleeve arranged so that the end of its smallest diameter faces the rivet head-like foot 11 of the plastic sleeve 12. Its upper end, which has the largest diameter, is standing by a certain amount of, for example, 2 mm above that upper front end 16 of the plastic sleeve 12 over. the Recess 15 of the plastic sleeve 12 has one on the upper End face 16 of the shaft 17 of the plastic sleeve 12 beginning and extending into the foot 11 into circular cylindrical Area 19, to which a conical intermediate

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area a short circular cylindrical one with a larger diameter Area 20 connects, which extends to the lower end face of the foot II of the plastic sleeve.

The cylindrical region 19 of the central recess 15 is open encompasses its entire length by the cylindrical helical spring 13, which in turn is completely embedded in the plastic Plastic sleeve 12 without or at a small distance from the Inner wall of the central recess 15 is embedded. The helical spring 13 has turns of constant pitch, adjacent turns are spaced from one another.

The surface of this helical spring 13 is roughened in a manner not shown, so that it is more form-fitting Hold in the plastic of the plastic sleeve 12 is improved and it cannot rotate in the plastic .der plastic sleeve even under unfavorable circumstances. Without one such roughening would reduce the risk of the helical spring 13 rotating in the plastic sleeve with greater wear of the Plastic sleeve 12 occur, especially if the shaft 17 of the plastic sleeve extends to a fraction of that in the drawing shown axial length has shortened due to wear and tear. In this case, the helical spring 13 has also correspondingly shortened by wear and the anti-skid pin 14 has moved correspondingly far down, in such a way that the length its about the plastic sleeve protruding area remains constant. When the plastic spike is so heavily worn, the wire helix relative to the plastic sleeve 12 rotates, i.e. out of the plastic a little upwards-

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rotates, there is a risk that the hold of the anti-skid pin could be reduced to such an extent that this anti-skid pin is thrown out of the plastic sleeve
can be. This is prevented in a simple manner by the roughening of the surface of the wire helix 13. This roughening also improves the hold of the anti-skid pin in all other positions that occur and also has a beneficial effect on the self-adjustment of the anti-skid pin.

The retention of the wire helix in the plastic by the
To improve measures according to the invention also has the advantage of cheap mass production of the wire helix, since the
Do not provide wire helix with an angled wire end
must become.

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Claims (7)

2956 claims 1. Spike for automobile tires with one in the automobile tires insertable plastic sleeve and one in a central, axial recess of the plastic sleeve used, self-adjusting anti-skid pin, which is on at least a partial area its length tapers towards its puss, wherein the plastic sleeve is a form-fitting embedded, has coaxial wire helix to its recess, according to the main patent (patent application P 21 11 682.5), thereby characterized in that the surface of the wire helix (13) is rough. 2. Spike according to claim 1, characterized in that the wire helix is mechanically roughened. 3. Spike according to claim 1, characterized in that the wire helix is chemically roughened. 4. Spik ^e according to claim 1, characterized in that the wire helix has a rough coating. 5. Spike for automobile tires with one in the automobile tires insertable plastic sleeve and one inserted into a central, axial recess of the plastic sleeve, itself readjusting anti-skid pin, which is on at least one part 3 09831/0014 2956 -f - part of its length tapers towards its foot, wherein the plastic sleeve has a positively embedded wire helix coaxial to its recess, according to the main patent (Patent application P 21 11 682.5), in particular probe according to one of the preceding claims, characterized in that that the wire of the wire helix is inclined or transverse to its longitudinal direction, preferably recesses in the form of impressions produced by rolling, hammering or the like. 6. Spike for motor vehicle tires with one in the motor vehicle, mature insertable plastic sleeve and one inserted into a central, axial recess of the plastic sleeve, itself readjusting anti-skid pin which tapers over at least part of its length in the direction of its foot, wherein the plastic sleeve has a positively embedded wire helix coaxial to its recess, according to the main patent (Paterit application P 21 11 682.5), in particular according to one of the preceding claims, characterized in that that the wire of the wire helix has a non-circular cross-section over its entire length and that the non-circularity run spirally in the longitudinal direction of the wire around the longitudinal axis of the wire. 7. Spike according to claim 6, characterized in that the wire is a twisted profile wire, the cross section of which is preferably polygonal. 309831/0014