FR3061830A1 - KNIFE-TYPE METAL CUTTING TOOL OR ROTATING MOBILE HAMMER FOR MILLING OR MOWING PLANTS - Google Patents

Abstract

The present invention relates to a cutting tool (1; 100; 200) of rotating knife or hammer type metal for grinding or mowing plants, comprising a main body (2; 102; 202) intended to be hooked to a blade rotor of an agricultural mowing / brushcutting machine and at least one cutting portion (5; 105; 205) provided with a cutting edge (6; 106; 206), characterized in that the part of cut (5; 105; 205) is provided on at least part of its external surface with a reinforcement (10) of tungsten carbide.

Description

Holder (s): simplified.

FORGES GORCE Business corporation

O Extension request (s):

® Agent (s): CABINET MALEMONT.

® METAL CUTTING TOOL OF THE KNIFE TYPE OR MOBILE ROTATING HAMMER FOR CRUSHING OR MOWING PLANTS.

FR 3,061,830 - A1 (57) The present invention relates to a cutting tool (1; 100; 200) of metal of the knife or hammer type which is movable in rotation for grinding or mowing plants, comprising a main body ( 2; 102; 202) intended to be attached to a blade holder rotor of an agricultural mowing / brushcutting machine and at least one cutting part (5; 105; 205) provided with a cutting edge (6; 106; 206 ), characterized in that the cutting part (5; 105; 205) is provided, on at least part of its external surface, with a reinforcement (10) made of tungsten carbide.

The present invention relates to a metal cutting tool of the knife or hammer type which is movable in rotation for mowing plants, brush cutting or hedging.

In the prior art, there are many types of agricultural mowing / grinding machines, for example brushcutters for mowing the edges of communication routes (roads, railways) or fields. These machines generally use a horizontal rotor rotating on an axis perpendicular to the direction of advance of said machine and carrying a multitude of mowing / grinding tools such as knives or hammers preferably distributed over the length and the circumference of said rotor.

These tools are mounted free to rotate by means of an integrated eyelet or a shackle, and stand outwards from the rotor under the effect of centrifugal force when the rotor turns in order to grind or cut. vegetation (depending on the position of the hammer and the part of the latter which comes into contact with said vegetation during the rotation of the rotor).

However, these tools tend to wear out quickly in use, in particular because they are subjected to numerous shocks, for example on stones or branches of large diameter. Their lifespan is such that it is therefore necessary to replace them often, which generates significant operating costs and unusable downtime during which the agricultural machine cannot operate.

An object of the present invention is therefore to solve the problems mentioned above with the aid of a solution which is superiorly durable, simple to implement, reliable and effective.

More specifically, the subject of the present invention is a metal cutting tool of the knife or hammer type which is mobile in rotation for the grinding or mowing of plants, comprising a main body intended to be hung on a blade holder rotor of an agricultural machine. mowing / brush cutting and at least one cutting part provided with a cutting edge, characterized in that the cutting part is provided, on at least part of its external surface, with a tungsten carbide reinforcement.

According to preferred embodiments of the present invention:

- The reinforcement is in the form of a plate brazed on the surface of the cutting part;

the brazing material is a copper / silver alloy allowing a resistance greater than 30 kg / mm ² and preferably approximately 35 kg / mm ² ;

the thickness of the plate is from a few tenths of a millimeter to a few millimeters, preferably between 1 and 5 millimeters, and advantageously of the order of 2 to 3 millimeters;

the tool has a J-shaped profile with a central core and a curved cutting part comprising a single cutting edge situated at the end of the J, perpendicular to said core, the cutting part being provided with the reinforcement;

Or

- The tool has a central core extending by an inclined cutting part comprising two lateral cutting edges bevelled in opposition, the cutting part being provided with a reinforcement by cutting edge;

Or

- The tool presents from the front the shape of an inverted T with a central core and a transverse wing forming two cutting parts respectively comprising two cutting edges parallel to each other, each cutting part being provided with a reinforcement by cutting edge.

Advantageously, the reinforcement extends to the edge of each cutting edge.

The present invention also relates to a blade holder rotor of an agricultural mowing / brushcutting machine equipped on its periphery with one or more tool (s) as defined above.

The present invention further relates to an agricultural machine, in particular a mower or a brushcutter, equipped with such a rotor.

The invention will now be described in more detail with reference to particular embodiments given by way of illustration only and represented in the appended figures in which:

Figures 1 to 4 are side, front and perspective views of a first embodiment of a mowing / grinding tool according to the present invention.

FIGS. 5 to 8 are side, front and perspective views of a second embodiment of a mowing / grinding tool according to the present invention, and

Figures 9 to 12 are side, front and perspective views of a third embodiment of a mowing / grinding tool according to the present invention.

FIGS. 1 to 4 represent a tool 1 for mowing / grinding in resistant metal of the knife type suitable for being mounted on a horizontal rotor of an agricultural machine such as a mower or a brush cutter, for example for a highway embankment. This tool 1 has a “J” shaped profile and for this purpose comprises a central core 2 comprising an attachment eyelet 3 and a curved cutting part 5 comprising a single cutting edge 6 situated at the end of the J, perpendicularly to said core 3. According to the invention, the cutting part 5 is provided with a reinforcement 10 of tungsten carbide, more precisely a plate brazed to the metal constituting the tool 1 and which extends to the edge of the cutting edge 6.

FIGS. 5 to 8 show a second embodiment of the knife type mowing / grinding tool adapted to be mounted on a horizontal rotor of an agricultural machine such as a mower, a brush cutter or a rotary mower, for example for highway embankment. In this variant, the tool 100 has a central core 102 provided with a fastening orifice 103 and extending by an inclined cutting part 105 comprising two bevelled lateral cutting edges 106 mounted in opposition. The cutting part 105 comprises, for each cutting edge 106, a tungsten carbide reinforcement 10, more precisely a plate brazed to the metal constituting the tool 100 and which extends to the edge of the cutting edge 106.

FIGS. 9 to 12 represent a third embodiment of the mowing / grinding tool of the grinding hammer type adapted to be mounted on a horizontal rotor of an agricultural machine such as a mower or a brush cutter, for example for embankments highway. In this variant, the tool 200 presents from the front the shape of an inverted "T" with a central core 2 02 provided with an orifice 203 and a transverse wing 204 comprising two cutting parts 205 and a lower face 207. The cutting parts 205 respectively have cutting edges 206 arranged in parallel on either side of the lower face 207. Each cutting part 205 has, at its respective cutting edge 206, a tungsten carbide reinforcement 10, more precisely a plate brazed to the metal constituting

the tool 200 and which extends to the edge of the cutting edge 206. In the fashions of production represented and described. the brazing material East an alloy copper / silver allowing a superior resistance at 30 kg / mm ² and preferably around 35 kg / mm ² . The thickness of the brazed plate is of

a few tenths of a millimeter to a few millimeters, for example about 3 millimeters.

Thus, thanks to the presence of the tungsten carbide reinforcement 10, the cutting tool according to the present invention has a superior impact resistance compared to that of the tools of the prior art so that it is not no need to change them as often. The agricultural machine can therefore operate longer because it is subject to reduced maintenance periods, and the costs induced by the change of tools (in particular the man time and the purchase price of spare parts) are also reduced.

It should be understood that the detailed description of the subject of the invention, given solely by way of illustration, does not in any way constitute a limitation, the technical equivalents also being included in the field of the present invention.

Thus, the tool the desired use, cutting edges (s) and may have other shapes with one or more part (s) of reinforcement (s) in tungsten carbide.

according to cut,

Claims (10)

1. Cutting tool (1; 100; 200) of metal of the knife or hammer type, rotating in rotation for the grinding or mowing of plants, comprising a main body (2; 102; 202) intended to be hung on a carrier rotor blades of an agricultural mowing / brushcutting machine and at least one cutting part (5; 105, · 205) provided with a cutting edge (6; 106; 206), characterized in that the cutting part (5; 105; 205) is provided, on at least part of its external surface, with a reinforcement (10) of tungsten carbide. 2. Cutting tool (1; 100; 200) according to claim 1, characterized in that the reinforcement (10) is in the form of a plate brazed on the surface of the cutting part (5, · 105; 205). 3. Cutting tool (1; 100; 200) according to claim 2, characterized in that the brazing material is a copper / silver alloy allowing a resistance greater than 30 kg / mm ² and preferably about 35 kg / mm ² . 4. Cutting tool (1; 100; 200) according to any one of claims 2 to 3, characterized in that the thickness of the reinforcing plate (10) is from a few tenths of a millimeter to a few millimeters, preferably between 1 and 5 millimeters, and advantageously of the order of 2 to 3 millimeters. 5. Cutting tool (1) according to any one of the preceding claims, characterized in that it has a J-shaped profile with a central core (2) and a curved cutting part (5) comprising a single stop. cutting edge (6) located at the end of the J, perpendicular to said core, the cutting part (5) being provided with reinforcement (10). 6. Cutting tool (100) according to any one of claims 1 to 4, characterized in that it has a central core (102) extending by an inclined cutting part (105) comprising two lateral cutting edges bevelled opposition (106), the cutting part (105) being provided with a reinforcement (10) by cutting edge (106). 7. Cutting tool (200) according to any one of claims 1 to 4, characterized in that it has the front in the form of an inverted T with a central core (202) and a transverse wing (204) forming two cutting parts (206) comprising 5 respectively two cutting edges parallel to each other (206), each cutting part (205) being provided with a reinforcement (10) by cutting edge (2 06). 8. Cutting tool (1; 100; 200) any one of claims 5 to 7, characterized in that the reinforcement (10) extends 10 to the edge of each cutting edge (6; 106; 206). 9. Rotor blade holder of an agricultural mowing / brushcutting machine equipped on its periphery with one or more tool (s) (1; 100; 200) according to any one of claims 1 to 8. 15 10. Agricultural mowing / brushcutting machine equipped with a rotor according to claim 9. 106 105 106 FIG. 6 105 4/5