Snow removal blade for the snowplow blade

Abstract

The invention relates to a snow removal blade (1) for the blade of a snowplow, comprising a front steel plate (2) and a rear steel plate (3) which can be jointly fixed to the lower edge of the blade by means of fastening means, and between which an elastic rubber body (4) is vulcanized. One or more metallic wear strips (5) are embedded in this rubber body (4) in a limited manner, each of which is provided with anchoring elements (5a, 5b, 5c) that engage positively in the rubber body and has a clearing edge (6) that contacts the road surface (8) to be cleared, which is reinforced by one or more hard metal inserts (7). The object of the invention is to significantly simplify the manufacture of such a snow removal blade without impairing its functionality and operational reliability.To solve this problem, the invention proposes that the metallic wear strips (5) are each designed as castings made of hard iron casting, which in their embedding area are provided with projections (5a) and / or recesses (5b) and / or openings (5c) produced during the casting process in the rubber body (4), serving as positive-locking anchoring elements (5a, 5b, 5c), and that the hard metal inserts (7) are fixed in the wear strips (5) by overmolding with the hard iron casting.

Description

[0001] The invention relates to a snow clearing strip for the clearing blade of a snow plow with a front steel plate and a rear steel plate, which can be fixed together by means of fastening means to the lower edge of the clearing blade and between which an elastic rubber body is vulcanized, wherein one or more metallic wear strips are embedded in this rubber body with limited mobility, which have a clearing edge which touches the road surface to be cleared and which is reinforced by one or more hard metal inserts.

[0002] Snow clearing blades of this type are known, for example, from DE 10 2016 114 457 A1. The snow clearing blades resulting from this publication have proven extremely effective in practical use, particularly where particularly intensive wear and thus short downtimes are to be expected due to the operating conditions of the snow plow (e.g., high driving speeds and clearing snow). The improved wear resistance results primarily from the high abrasion resistance of the hard metal inserts, such as tungsten carbide, in the metal wear blades.

[0003] However, during the series production of these state-of-the-art snow clearing blades, it has become apparent that the production of the metal wear strips reinforced with hard metal inserts is extremely labor-intensive and can lead to problems with wear resistance. The metal wear strips must be fitted with the hard metal inserts piece by piece before being embedded in the rubber compound of the rubber body. To do this, precisely fitting openings for the hard metal inserts must first be created in the metal wear strips, which are usually made of steel. This requires machining processes (cutting, drilling, milling, grinding, etc.). The hard metal inserts must then be precisely inserted into these openings and secured using a special brazing process.

[0004] The intense heating during brazing can cause harmful structural changes in the wear strip material in the embedding area of ​​the hard metal inserts, impairing their wear resistance. Attempts to eliminate these structural changes by subsequently tempering the wear strip material can result in undesirable cracking in the hard metal insert material.

[0005] It is therefore an object of the invention to further develop the snow clearing bar of the type mentioned at the outset in such a way that its manufacture is considerably simplified without impairing its wear resistance.

[0006] To achieve this object, the invention proposes, starting from a snow clearing bar of the type mentioned at the outset, that the metallic wear bars are each designed as cast parts made of chilled iron, and that the hard metal inserts are fixed in the wear bars by casting them with the chilled iron.

[0007] The teaching of the invention, on the one hand, combines all of the above-explained manufacturing steps for the production of the metallic wear strips reinforced with hard metal inserts into a single operation, namely the production of a cast part made of chilled iron, and, on the other hand, avoids the soldering of the hard metal inserts into the metallic wear strips, which is detrimental to stability and wear resistance.

[0008] A useful development of the invention provides that the hard metal inserts are provided with projections and / or recesses and / or openings to create an additional positive fit within the volume of the metallic wear strips. This additional securing of the hard metal inserts through positive fit is only possible if, according to the teachings of the invention, the hard metal inserts are fixed in the metallic wear strips by encapsulating them with the chilled iron casting. This additional securing of the hard metal inserts in the metallic wear strips would be difficult to achieve with the prior art, purely materially bonded soldering of the hard metal inserts into the metallic wear strips.

[0009] A particularly advantageous embodiment of the invention provides that the metallic wear strips are provided in their embedding area in the rubber body of the snow clearing strip with projections and / or depressions (5b) and / or openings, which serve as a positive anchoring in the rubber mass of the rubber body (4) and are integral components of the metallic wear strips designed as a cast part.

[0010] This ensures that, at the same time as the metal wear strips are manufactured as cast parts, their anchoring elements are also manufactured as suitable molds of the respective cast part. This measure eliminates, in particular, the labor-intensive and complicated process of attaching anchoring elements to the metal wear strips. Furthermore, this measure also simplifies the assembly of all individual parts of the snow removal strip before vulcanizing the rubber body, because the number of parts to be joined is significantly reduced.

[0011] In order to increase road safety for the traffic following the respective snow plough, it is further provided that the front steel plate and / or the rear steel plate are provided with openings into which the projections of the metallic wear strip embedded in the rubber mass of the rubber body engage with sufficient play, whereby these projections of the metallic wear strip are dimensioned in such a way that the metallic wear strip cannot fall out of the space between the front steel plate and the rear steel plate even if the rubber mass embedding it is lost, ie that the distance between the protruding ends of the projections is greater than the distance between the front steel plate and the rear steel plate.

[0012] A specialized embodiment of the clearing bar according to the invention for particular applications provides that the lower edges of the wear strips lie in a plane with the lower edges of the front steel plate under the rear steel plate, with this plane running at an acute angle to the road surface to be cleared. A clearing bar designed in this way rests at an acute angle on the road surface to be cleared with a relatively large contact surface—consisting of the two steel plates, the metallic wear strips with hard metal inserts, and the intermediate rubber layers of the rubber body. This large contact surface with soft rubber components ensures particularly gentle removal of snow, for example, from the road surface to be cleared.

[0013] If, on the other hand, a more aggressive snow clearing blade is required, for example, to additionally clear frozen ice from the road surface during so-called black-out clearing, a further embodiment of the invention proposes that the lower edges of the metallic wear strips protrude downwards beyond the lower edges of the front steel plate and the rear steel plate and are thickened in the protruding area. Such a thickening can be easily produced on the wear strips, each of which is designed as a cast piece, using a correspondingly designed casting mold and ensures significantly longer service life for such a snow clearing blade used for black-out clearing.

[0014] A particularly preferred embodiment of the snow clearing strip according to the invention provides that the metallic wear strips project downwards over the lower edges of the front steel plate and the rear steel plate and that on the surfaces of the front and / or the rear of the wear strips, inclined or curved snow sliding ramps running parallel to the lower edges of the front steel plate or the rear steel plate are arranged between the surfaces of the wear strips on the one hand and the outer sides of the front steel plate or the rear steel plate on the other hand.

[0015] These snow ramps provide a seamless transition between the surfaces of the wear bars on the one hand and the outer surfaces of the front and rear steel plates on the other. These snow ramps ensure that snow or ice does not splash up during rapid movement over the surfaces of the wear bars and steel plates, thus obstructing the snowplow driver's view. This very useful detail can also be implemented on cast wear bars without additional effort, as it is only necessary to design the molds used for production accordingly. A further advantage is that the ramps reinforce the cross-section of the metal wear bar where it is most subject to bending stress during use of the snow clearing bar.

[0016] Embodiments of the invention are explained in more detail in the following drawings. They show: Fig. 1: schematically shows a side view of a snow clearing bar according to the invention in a first embodiment, partially cut away; Fig. 1a: schematically a section through the snow clearing bar according to Fig. 1a along the section line AA in Fig. 1; Fig. 1b: schematically a section through the snow clearing bar according to Fig. 1a along the section line BB in Fig. 1; Fig. 2: schematically a side view of a snow clearing bar according to the invention in a second embodiment, partially cut away; Fig. 2a: schematically a section through the snow clearing bar according to Fig. 2a along the section line AA in Fig. 2; Fig. 3: schematically a side view of a snow clearing bar according to the invention in a third embodiment, partially cut away; Fig. 3a: schematically a section through the snow clearing bar according to Fig. 3a along the section line AA in Fig. 3; Fig. 4: schematically shows a side view of a snow clearing bar according to the invention in a fourth embodiment, partially cut away; Fig. 4a: schematically a section through a snow clearing bar according to Fig. 4a along the section line AA in Fig. 4; Fig. 4b: schematically a section through a snow clearing bar according to Fig. 4a along the section line BB in Fig. 4; Fig. 5: schematically a side view of a metal wear rail designed as a cast piece with cast-in hard metal inserts for the snow clearing bar according to Fig. 1; Fig. 5a: schematic section through the Fig. 5 metallic wear rail shown; Fig. 5b: schematically a perspective view of the Fig. 5 shown metallic wear rail; Fig. 6: schematically a side view of the metal wear rail designed as a cast piece with cast-in hard metal inserts and snow sliding ramps for the snow clearing bar according to Fig. 4; Fig. 6a: schematically a narrow side view of the Fig. 6 shown metallic wear rail; Fig. 6b: schematically a perspective view of the Fig. 6 shown metallic wear rail; Fig. 7: schematically a side view of one of the hard metal inserts of the snow clearing bar according to Fig. 4; Fig. 7a: schematically a narrow side view of the Fig. 7 shown hard metal insert; Fig. 7b: schematically a perspective view of the Fig. 7 hard metal inserts shown; Fig. 8: schematically a side view of one of the hard metal inserts with form-locking elements for the snow clearing bar according to Fig. 1; Fig. 8a: schematically a narrow side view of the Fig. 8 hard metal insert shown; Fig. 8b: schematically a perspective view of the Fig. 8 shown hard metal insert.

[0017] In the Fig. 1, Fig. 1a, Fig. 1b, Fig. 2, Fig. 2a, Fig. 3, Fig. 3a, Fig. 4, Fig. 4a and Fig. 4b, the snow clearing bar is designated overall by the reference number 1.

[0018] As the respective sectional views of the individual snow clearing blades 1 show, they are each provided with a front steel plate 2 on their front side in the direction of travel of the snow plow and with rear steel plates 3 on their rear side in the direction of travel of the snow plow. The front steel plate 2 and the rear steel plate 3 can be secured together with fastening means not shown in the drawing, e.g., fastening screws, to the lower edge of the clearing blade of a snow plow (also not shown).

[0019] A rubber body 4 is vulcanized between the front steel plate 2 and the rear steel plate 3. One or more metallic wear strips 5—three in the illustrated embodiments—are embedded in this rubber body 4, allowing limited movement. The limited mobility of these metallic wear strips 5 relative to the surrounding steel plates 2 and 3 results from the elasticity of the surrounding rubber mass of the rubber body 4.

[0020] The metallic wear strips 5 are each embedded in the rubber body 4 in such a way that their lower edge 6, referred to as the clearing edge, rests on the road surface to be cleared. To reduce wear, these lower edges 6 of the metallic wear strips 5 are each reinforced with hard metal inserts 7, preferably made of tungsten carbide or similar hard metals.

[0021] According to the teaching of the invention, the metallic wear strips 5 are each designed as one-piece castings made of chilled iron casting, which are provided in their embedding area in the rubber body 6 with anchoring elements in the form of projections 5a, depressions 5b and / or openings 5c that engage positively in the rubber mass. The production and positioning of these anchoring elements 5a, 5b and 5c takes place simultaneously with the production of the metallic wear strips 5, namely the casting process, and requires no additional operations. Furthermore, according to the teaching of the invention, the hard metal inserts 7 of the metallic wear strips 5 are fixed in the metallic wear strips 5 by encapsulating them with chilled iron casting and therefore do not need to be soldered or otherwise fastened into receiving openings of the metallic wear strips 5 in a separate operation.Overall, the particular advantage of the teaching of the invention is that the novel production of the metallic wear strips 5 significantly reduces the total labor required for the production of snow removal strips 1 and at the same time improves their functionality.

[0022] In the Fig. 1, Fig. 1a and Fig. In the embodiment of the snow clearing bar according to the invention shown in Figure 1b, the lower edges 6 (clearing edges) of the metallic wear strips 5, reinforced with the hard metal inserts 7, lie in a plane with the lower edges of the front steel plate 2 and the rear steel plate 3, wherein this plane extends at an acute angle to the road surface 8 to be cleared. As already explained in the introduction to the description, this results in a particularly large contact surface on the road surface 8 to be cleared, thus enabling particularly gentle removal of snow or ice from this road surface 8. Furthermore, in this embodiment of the snow clearing bar according to the invention, the hard metal inserts 7 are provided with form-locking elements 7a, which engage positively in the volume of the metallic wear strips 5 and are thereby additionally secured against falling out.These form-locking elements 7a can be designed as projections, as shown. However, they can equally well be formed by recesses, openings, or recesses in the body of the hard metal inserts.

[0023] In the example according to the Fig. 2 and Fig. 2a, the metallic wear strips 5 project downwards over the lower edges of the front steel plate 2 and the rear steel plate 3 and are thickened in the projecting area. This results in a significantly longer service life of the snow removal strip thus formed, particularly during so-called black snow clearing. The positive locking of the metallic wear rails 5 in the rubber body 4 is achieved here by curved depressions 5b of the metallic wear strips 7 in their embedding area, which merge upwards and downwards into adjoining projections 5a (thickened areas). The additional positive locking of the hard metal inserts 7 in the metallic wear strips 5 is achieved here by the fact that the hard metal inserts 7 are wedge-shaped in cross-section, i.e.have a wedge-shaped projection 7a which widens upwards and engages positively into the body of the metallic wear strip 5 made of chilled cast iron.

[0024] The embodiment according to the Fig. 3 and Fig. 3a largely corresponds to the embodiment according to the Fig. 2 and Fig. 2a, with the difference that here the metallic wear rails 5 embedded in the rubber body 4 are provided in the embedding area on their surfaces with wave-shaped alternating projections 5a and depressions 5b which ensure the required positive connection in the rubber body 4.

[0025] In the example of the snow clearing bar according to the Fig. 4, Fig. 4a and Fig. 4b, the metallic wear strips 5 also protrude downwards over the lower edges of the front steel plate 2 and the rear steel plate 3 and are thickened in the protruding area. Furthermore, snow sliding ramps 9a and 9b, respectively, are arranged in the surfaces of the front and rear of the metallic wear strips 5, which run parallel to the lower edges of the front steel plate 2 and the rear steel plate 3 and are inclined or curved on their upper sides. As already discussed in the introduction to the description, these snow sliding ramps 9a and 9b ensure, when such a snow clearing strip is used, a gradual transition between the surfaces of the wear strip 5 on the one hand and the adjoining surfaces of the front steel plate 2 and the rear steel plate 3 on the other. These sliding ramps 9a and 9b, respectively, also9b are one-piece components of the metallic wear strips 5, each made of chilled cast iron.

[0026] The Fig. 5, Fig. 5 a and Fig. 5b show the snow clearing bars according to Fig. 1 used metallic wear strips 5 before they are vulcanized into the rubber body 4. These metallic wear strips 5 are made of chilled cast iron, e.g. GGG-40 LT, are provided in their embedding area with anchoring elements in the form of projections 5a that engage positively in the rubber body 4 of the snow clearing strip 1 and contain the hard metal inserts 7 in the area of ​​their lower edge 6. The fixing of these hard metal inserts 7 in the volume of the wear strips 5 is achieved by the hard metal inserts being cast around the hard metal inserts during the casting of the wear strips 7. For additional security, the hard metal inserts 7 are provided here with projections 7a, which fix the hard metal inserts 7 in the volume of the wear strips 5 in addition to the material connection by means of a positive fit.

[0027] The Fig. 6, Fig. 6 a and Fig. 6b show the snow clearing bar according to Fig. 4 used metallic wear strips 5 before they are vulcanized into the rubber mass of the rubber body 4 of the snow clearing bar 1. This metallic wear strip 5 is also made of hard cast iron (e.g. GGG-40 LT) and is provided in its embedding area with anchoring elements, here in the form of projections 5a and openings 5c, which engage positively in the rubber mass of the rubber body 4 of the snow clearing bar 1. In addition, these wear strips 5 are provided on their front and rear sides with the aforementioned snow sliding ramps 9a and 9b, which are an integral part of the metallic wear strip, i.e., are also made of hard cast iron. Finally, the lower edge 6 of the metallic wear strip 5 is also reinforced by hard metal inserts 7, which are designed here as simple cuboid blocks cast with hard cast iron, as for example from the Fig. 7, Fig. 7a and Fig. 7b.

[0028] The Fig. 8, Fig. 8a and Fig. 8b finally illustrate in detail the snow removal bar according to Fig. 1 used, in the wear strip 5 of which hard metal inserts 7 are embedded, which are provided with projections 7a which engage positively in the volume of the metallic wear strips 5 List of reference symbols 1 snow clearing bar 2 front steel plate 2a Opening in front steel plate 3 rear steel plate 3a Opening in rear steel plate 4 rubber bodies 5 metallic wear strip 5a Projections of the metallic wear strip 5b Recesses of the metallic wear strip 5c Breakthroughs of the metallic wear strip 6 Lower edge (clearing edge) of the metallic wear strip 7 carbide inserts 7a Projections of hard metal inserts 8 Road surface 9a Snow gliding surface 9b Snow gliding surface QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2016 114 457 A1

[0002]

Claims

[1] 1. Snow clearing strip (1) for the blade of a snow plough with a front steel plate (2) and a rear steel plate (3), which can be fixed together by means of fastening means to the lower edge of the blade and between which an elastic rubber body (4) is vulcanised, wherein one or more metallic wear strips (5) are embedded in this rubber body (4) with limited mobility, which wear strips have a clearing edge (6) in contact with the road surface (8) to be cleared, which is reinforced by one or more hard metal inserts (7), characterized by that the metallic wear strips (5) are each designed as cast parts made of chilled iron, and that the hard metal inserts (7) are fixed in the metallic wear strips (5) by casting them with the chilled iron. [2] Snow clearing bar (1) according to claim 1, characterized bythat the hard metal inserts (7) are provided with projections (7a) and / or depressions and / or openings to produce an additional positive connection with the metallic wear strips (5). [3] Snow clearing bar (1) according to claim 1 or 2, characterized by that the metallic wear strips (5) are provided in their embedding area in the rubber body (4) of the snow clearing strip (1) with projections (5a) and / or depressions (5b) and / or openings (5c), which act as a positive anchoring in the rubber mass of the rubber body (4) and are one-piece components of the metallic wear strips (1) designed as cast parts. [4] Snow clearing bar (1) according to claim 3, characterized bythat the front steel plate (2) and / or the rear steel plate (3) are provided with openings (2a, 3a) into which the projections (5a) of the metallic wear strip (5), which are embedded in the rubber mass of the rubber body (4), engage with sufficient play, wherein these projections (5a) of the metallic wear strip (5) are dimensioned such that the metallic wear strip (5) cannot fall out of the space between the front steel plate (2) and the rear steel plate (3) even if the rubber mass embedding it is lost. [5] Snow clearing bar (1) according to one of claims 1 to 4, characterized by that the lower edges of the wear strips (5) lie in a plane with the lower edges of the front steel plate (2) and the rear steel plate (3), this plane extending at an acute angle (α) to the road surface (8) to be cleared. [6] Snow clearing bar (1) according to one of claims 1-4, characterized bythat the metallic wear strips (5) project downwards over the lower edges of the front steel plate (2) and the rear steel plate (3) and are thickened in the projecting area. [7] Snow clearing bar (1) according to one of claims 1-4, characterized by that the metallic wear strips (5) project downwards over the lower edges of the front steel plate (2) and the rear steel plate (3) and that on the surfaces of the front and / or rear of the wear strips (5) there are arranged inclined or curved snow sliding ramps (9a, 9b) running parallel to the lower edges of the front steel plate (2) or the rear steel plate (3) between the surfaces of the wear rails (5) on the one hand and the outer sides of the front steel plate (2) or the rear steel plate (3) on the other hand.

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