CLEARING STRIP FOR THE CLEARING BLADE OF A SNOWPLOW

Abstract

Disclosed is a clearing strip for the clearing blade of a snowplow, comprising a front steel plate and a rear steel plate, which can be jointly fastened to the bottom edge of the clearing blade by means of fastening screws and between which an elastic rubber body is disposed. A metal wear strip is vulcanized into the rubber body, wherein the strip protrudes out of the rubber body downward toward the surface to be cleared and has a clearing edge which contacts the surface to be cleared. The strip is secured against release from the clearing strip with minimal design complexity, and without loss of the elastic play of the wear strip required for normal operation.

Claims

1. A clearing strip for the clearing blade of a snowplow, having a front steel plate and a rear steel plate, which can be jointly fastened to the bottom edge of the clearing blade by means of fastening screws, and between which an elastic rubber body is arranged, wherein at least one metal wear strip is vulcanized into the rubber body, which strip projects downward out of the rubber body, toward the surface to be cleared, and has a clearing edge that touches the surface to be cleared, wherein corresponding fastening openings are arranged in the steel plates and the rubber body, aligned with one another, through which openings fastening screws for fastening the clearing strip to the clearing blade pass, and that the wear strip is provided with securing recesses through which the fastening screws are passed, and the inner circumferences of which recesses leave spaces from the outer circumferences of the fastening screws, which spaces correspond to the maximum permissible elastic movement play of the wear strip vulcanized into the rubber body.

2. The clearing strip according to claim 1, wherein hard material wear bodies, preferably composed of tungsten carbide, are integrated into the metal wear strip at the clearing edge.

3. The clearing strip according to claim 1 wherein in addition, spacer sleeves that surround the fastening screws are arranged in the rubber body, the end faces of which sleeves are supported on the steel plates, and the outer circumferences of which sleeves leave spaces from the inner circumferences of the related safety securing recesses in the wear strip, which spaces correspond to the maximum permissible elastic movement play of the wear strip vulcanized into the rubber body.

4. The clearing strip according to claim 1, wherein at least two or more metal wear strips are provided in the rubber body, distributed over the length of the clearing strip.

Description

[0013] FIG. 1a: schematically, a clearing strip according to the invention, in a first embodiment, in a front view, partly in section;

[0014] FIG. 1b: schematically, a section through the clearing strip according to FIG. 1a, along the section line A-A (without fastening screw);

[0015] FIG. 1c: schematically, a section through the clearing strip according to FIG. 1a, along the section line B-B (with fastening screw);

[0016] FIG. 2a: schematically, a clearing strip according to the invention, in a second embodiment, in a front view, partly in section;

[0017] FIG. 2b: schematically, a section through the clearing strip according to FIG. 2a, along the section line A-A (without fastening screw);

[0018] FIG. 2c: schematically, a section through the clearing strip according to FIG. 2a, along the section line B-B (with fastening screw);

[0019] FIG. 3a: schematically, a clearing strip according to the invention, in a third embodiment, in a front view, partly in section;

[0020] FIG. 3b: schematically, a section through the clearing strip according to FIG. 3a, along the section line A-A (with fastening screw);

[0021] In FIGS. 1a and 1b, a clearing strip is referred to, in its totality, with the reference symbol 1. The clearing strip 1 has a front steel plate 2 and a rear steel plate 3, which are connected in one piece with one another, on their top side, by means of an arched piece 4 that also consists of steel.

[0022] An elastic rubber body 5 is arranged between the two steel plates 2, 3. Three metal wear strips 6 are vulcanized into this rubber body 5. These wear strips 6, which consist of high-strength steel, project downward out of the rubber body 5 and have a clearing edge 7 at their end that projects out of the rubber body 5, which edge touches the surface 8 to be cleared —which is generally the road surface—during operation of the snowplow. Hard material wear bodies 7a composed of tungsten carbide are integrated into the clearing edges 7 of the wear strips 6, in order to reduce wear and to improve the sliding properties.

[0023] To fasten the clearing strip 1 onto the clearing blade of a snowplow, not shown in the drawing, fastening screws 9 are provided, which are passed through fastening openings in the steel plates 2 and 3, the rubber body 5, and the wear strips 6, which openings are arranged to align with one another and correspond to one another. In this regard, according to the teaching of the invention, the passage openings for the fastening screws that are situated in the wear strips 6 are widened to form securing recesses 10, specifically in such a manner that spaces occur between the outer circumferences of the fastening screws 9 and the inner circumferences of the securing recesses 10, which spaces correspond to the maximum permissible elastic movement play of the wear strips 6 vulcanized into the rubber body 5. The amount of this movement play that must be provided in an individual case depends on the volume and the elastic properties of the rubber body 5 as well as on the size and direction of the forces that occur during operation and act on the wear strips 6.

[0024] The exemplary embodiment of FIGS. 2a, 2b and 2c essentially corresponds to the exemplary embodiment according to FIGS. 1a, 1b and 1c, with the difference that here the two steel plates 2 and 3 are not connected with one another in one piece, but rather are connected with one another by means of a connection piece 11 that is welded on. In the case of both the exemplary embodiments that have been explained until now, the space between the outer circumferences of the fastening screws 9 and the inner circumferences of the securing recesses 10 can alternatively be filled with rubber compound or also remain free of rubber compound.

[0025] The exemplary embodiments of FIGS. 3a and 3b differs from the exemplary embodiments shown above, first of all in that here, the two steel plates 2 and 3 are not connected with one another, but rather are essentially held together by the fastening screws 9. In order to nevertheless ensure the correctly dimensioned space between the two steel plates 2 and 3, in this exemplary embodiment spacer sleeves 12 that surround the fastening screws 9 are additionally provided in the rubber body 5, the end faces of which sleeves are supported on the steel plates 2 and 3, and the outer circumferences of which sleeves leave spaces from the inner circumferences of the related safety recess in 10 in the wear strips 6, which spaces correspond to the maximum permissible elastic movement play of the wear strips 6 vulcanized into the rubber body 5.

[0026] Here, too, the spaces between the outer circumferences of the spacer sleeves 12 and the inner circumferences of the securing recesses 10 can be filled with rubber compound or also remain free of rubber compound.

REFERENCE SYMBOL LIST

[0027] 1 clearing strip [0028] 2 steel plate [0029] 3 steel plate [0030] 4 arched piece [0031] 5 rubber body [0032] 6 wear strip [0033] 7 clearing edge [0034] 7a hard material wear bodies [0035] 8 surface to be cleared [0036] 9 fastening screw [0037] 10 securing recess [0038] 11 connection piece [0039] 12 spacer sleeve