TECHNICAL FIELD

The present invention relates to a blade for removing snow or ice from the road.

BACKGROUND ART

A blade is fitted to a vehicle for clearing snow or slushy mixtures of snow and ice from a road.

While the vehicle is moving, the blade is raised and held at a distance from the road surface to prevent it from being damaged. In this way, some of the snow is not deflected as it remains between the blade and the road surface and is thus left on the road surface. The snow that is left on the road surface may be compressed by passing vehicles and turn into ice, thus creating hazardous conditions for traffic.

The object of the present invention is to provide a more efficient blade for removing snow or ice from a road.

DISCLOSURE OF INVENTION

The object of the present invention is achieved with a blade as claimed in claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be described with reference to the accompanying drawings, illustrating some non-limiting embodiments thereof, in which:

figure 1 is a perspective schematic .view of an improved blade according to the present invention; and

figure 2 is a partial cross-section of the blade in figure 1 along the line II-II.

BEST MODE FOR CARRYING OUT THE INVENTION

In figure 1, designated as a whole by number 1 is a blade attachment that can be fitted to a vehicle for removing the snow from a road.

The blade 1 is attached to the vehicle by means of a mechanism comprising an articulated arm 2 to guide the movement of the blade 1 at least, in the vertical direction and an actuator 3 configured to operate the blade 1 when a driver of the vehicle sends a command from the driver's cab.

The blade 1 comprises a shield 4 having one edge 5 that faces the road, in use, and a cutting edge 6 fixed to the edge 5. The cutting edge 6 is the interface between the road and the shield 4 and is detachably joined to the edge 5 so that it can be replaced when worn out due to coming directly into contact with the road surface . The blade 1 also comprises a fluid circuit 7 (schematically illustrated in figure 1) that is releasably connected to a system on board the vehicle for supplying a de-icing liquid. In particular, the fluid circuit 7 comprises a plurality of delivery ducts attached to the articulated arm 2 and/or to the shield 4 and/or to the cutting edge 6 and a plurality of nozzles 8 connected to the ducts to spread the de-icing liquid on the snow covering the road surface.

According to a preferred embodiment of the present invention, the nozzles 8 are attached to the cutting edge 6 so as to inject the de-icing liquid before or during clearing of the snow by the blade 1 so that the liquid penetrates deep into the layer of' snow that remains on the road after the passage of the blade 1. Under ideal conditions, the de-icing liquid penetrates the entire thickness of the snow left on the road surface after the passage of the blade 1.

This effect is achieved, for instance, when the nozzles 8 are incorporated in the thickness of the cutting edge 6. For example the cutting edge 6 comprises a pair of walls 9 facing one another and arranged parallel to the edge 5. The walls 9 define a cavity 10 connected to the ducts through which the de-icing liquid Is delivered. The cavity 10 ends towards the road surface with the nozzles 8.

The blade 1 works in the following way.

The blade 1 is lowered onto the road surface to be cleaned by means of the articulated arm 2 and the actuator 3 so that the cutting edge 6 is as close as possible to the road surface .

The snow collects in the cavity defined by the shield 4 and is deflected over the side edges of the blade 1 onto the side of the road surface. However, a small amount of snow is not deflected and is compressed between the cutting edge 6 and the road surface. In particular, this compression is exerted by the cutting edge 6 due to the effect of the vertical vibrations of the blade 1 and/or due to the effect of the pressure applied to the cutting edge 6 by the snow that is accumulated in the shield 4 and subsequently deflected towards the side of the road surface. This pressure tends to generate an effect similar to the drawing of the snow which passes through the space defined in the vertical direction between the road surface and the cutting edge 6.

The nozzles 8 are configured so as to deposit the de-icing liquid on the remaining snow so that at least a part of the liquid is mixed with the snow beneath the cutting edge 6 during the passage of the latter over the road surface. This effect can be obtained when the nozzles 8 are at least partially defined by the two longitudinal walls 9 of the cutting edge 6.

The advantages of the blade 1 according to the present invention are described below.

The de-icing liquid is injected into the remaining layer of snow during the formation of the latter, i.e. during the passage of the cutting edge 6, so that the de-icing liquid is spread more effectively through the layer of snow, which thus becomes softer and melts more easily.

When the de-icing liquid is deposited on the layer of snow that remains after the passage of the cutting edge .6, the liquid is not as effective as it is deposited on a more compact surface which prevents the liquid from spreading towards the road surface.

When the nozzle 8 is incorporated in the cutting edge 6, i.e. when the nozzle 8 is either inside the cavity 10 or is at least partially defined by the walls 9, the nozzle is protected and the risk of clogging by debris from the road surface or by some of the deflected snow is extremely low.. Lastly it is clear that modifications and variations may be made to the blade 1 described and illustrated herein without departing from the scope of the' present invention, as set forth in the ^' appended claims .

The cavity 10 may be provided with internal channels and dividing walls spaced longitudinally along the edge 5, each channel terminating in a nozzle 8 facing towards the road surface or defining a continuous cavity in a direction parallel to the edge 5. In the latter case, the nozzles 8 may be arranged inside the cavity 10 so as to distribute the de-icing liquid in a substantially uniform manner along said edge 5. The liquid runs due to the effect of gravity down the walls 9 onto the, layer of snow that remains following the passage of the blade 1. Alternatively, the liquid may be pressurized and distributed through the nozzles 8 by means of a specific device for pressurizing the de-icing liquid.

Alternatively, the nozzles 8 may be attached to the cutting edge 6 so as to deliver the de-icing liquid to an area in front of the cutting edge 6. In this way the liquid is always applied to the snow so as to penetrate the remaining layer before the passage of the blade 1. In particular, the snow is mixed with the de-icing liquid before being pressed onto the road surface by the cutting edge 6 or while being compressed and thus penetrates at least before the snow is definitively compressed by the passage of the cutting edge 6- so as to be spread through the entire thickness of the remaining layer of snow.

The cutting edge 6 may be made of a flexible material, for instance an elastomer such as natural rubber, or of a rigid material, i.e. plastic or metal or a metal matrix composite.

Moreover, the cutting edge 6 may have either a positive or negative inclination. A positive inclination is defined when a lower edge 11 proximal to the road surface is in front of the edge 5 of the shield 4 with respect to the direction of travel of the vehicle.

The composition of the de-icing liquid may vary. In particular, it may also comprise a granular component. Moreover, the blade 1 may comprise a second cutting edge preferably made of metal and hinged to the shield 4. The second cutting edge is movable, for example by means of a servo control, between a first retracted position in which the cutting edge 6 comes into contact with the road surface and an extracted position in which the cutting edge 6 is at a distance from the road surface and the second cutting edge comes in contact with the latter. The second movable cutting edge may bear nozzles for distributing de-icing liquid so that the cutting edge compresses snow mixed with said liquid during the passage thereof. For example the second cutting edge may be produced according to that described and illustrated above, i.e. it may incorporate the nozzles 8.