FR3078605A1 - MOWER BLADE EQUIPPED WITH A DEVICE WITH TWO PERPENDICULAR BLADES PERFECTLY CUTTING THE GRASS IN A SINGLE TIME - Google Patents

Abstract

The invention consists of a known conventional blade L having a sharpened side A, to which was added a device D comprising: two small blades Li and L 2 fixed symmetrically closer to the ends of the blade L and placed perpendicular to the Longitudinal axis to the said blade L, in a zone Zp L blade, this blade and equipped to cut the grass at once without ironing the mower Following many tests, the forms of sharpening of these new blades may vary, they are preferably bevel-shaped symmetrical sharpening but however in some cases, asymmetrical sharpening may also be appropriate, this depends on the different types of blades, and forms of mower housings The locations of L1 and L2 result a large number of tests carried out The distance Lz of positioning of the blades L1 or L2 at both ends has been optimized

Description

Mower blade equipped with a device with two perpendicular blades that perfectly cut the grass in one go.

Object of the invention

The invention is a mower blade equipped with a particular device. The new blade thus created perfectly cuts the grass in one go.

Prior art

When using a mower or other means to cut the grass such as a rotary cutter, robots, or any means equipped with a blade known to be normal in trade, it is often necessary to iron the mower on the grass already cut a first time. Indeed while advancing, the mower makes the grass lie down, by the rotation of the existing blades used in the prior art.

This requires at least one more pass of the mower, which takes energy and increases cutting costs. This disadvantage occurs more and more in general, in the case of the wear of a conventional blade bought in the trade, but also in the presence of tall grass and certain "weeds" more difficult to cut.

With this new device, the first mowing is perfect, we no longer need to iron the mower, hence the economic interest of this invention which will make the costs of cutting plants more profitable

This invention has several non-exhaustive advantages such as:

-time saving.

-Gain in wear and fuel consumption as well as all wearing parts.

- much less pollution due to the work done faster

The drawings used to understand the invention are:

Figure 1 plate 1/3: plan view from below or from above of a blade of the prior art not comprising the device object of the invention

Figure 2 plate 1/3: plan view from below of a blade fitted with the device

Figure 3 board 2/3 perspective view of one end of the underside of a blade equipped with the device object of the invention

Figure 3d plate 2/3 detailed view of the device located at each end of the blade

Figure 4 board 3/3 view of the positioning of the device fixed on the Main blade, which is fundamental to optimize the cutting efficiency

The invention includes:

A known conventional blade L having a sharp side A, to which a device D has been added comprising:

two small blades Li and L 2 fixed symmetrically as close as possible to the ends of the blade L and placed perpendicular to the longitudinal axis of said blade L, in a Zone Zp of blade L (Figures 2, 3 and 4)

Each small blade Li or L2 has at one of its ends a sharpening in the form of two bevels Bi and B2 sharpened symmetrically with respect to the axis B of the small blades Li or L2

The bevels Bi and B2 in the form of a bevel are placed on the side of the sharpening A of the main blade L (figure 3d)

Following numerous tests carried out, the forms of sharpening of these new blades can vary, they are preferably in the form of a bevel with symmetrical sharpening but however in certain cases: asymmetrical sharpening can also be suitable, this depends on the different types of blades, and shapes of mower decks

The locations of Li and L2 are not indifferent (see Figure 4) The distance Lz for positioning the blades Li or L2 at the 2 ends is such that we must:

1- respect a minimum distance d from the edge of the blade L which depends on the manufacturing possibilities for each tooling application chosen

2- stand in the positioning zone Zp of Lj and L2. Which must be as far as possible from the center of the blade O

This leads to defining a cutting efficiency coefficient Ce between 2 values thus defined

If lo is the half length of the blade

And Lz the distance between the center O of the blade and the axis p corresponding to the middle of the positioning of the zone Zp

This being the coefficient of the new blade, thus defined, it indicates the cutting efficiency of the new blade equipped with Li and L2

Ce = Lz / lo

The closer this coefficient is to 1, without ever reaching it, the more efficient the cutting of this new blade

After multiple tests, we were able to define the effectiveness interval of this criterion, which should be such that

0.8 <Ce <0.95

This criterion also depends on the manufacturing conditions to achieve this type of blade which will equip the different tools for which it is intended.

The thickness of these blades L1 and L2, as well as their depth can also vary depending on the material used (blades, mower decks, blade drive power) but also on the types of plants that must be cut.

Finally device D can

- or be sold as an Assembly Kit to be fixed to a commercial blade by various means known to those skilled in the art

-Either integrate into a new known blade to form a new blade that comes out of a mold in one piece ready for use.

The device attaching to a mower blade is integrated into a known blade to form a new blade made in one piece by molding, or welding, and ready for use.

Claims (6)

1- Assembly comprising a main mower blade (L) and a device (D) fixed on said blade (L), characterized in that said device (D) comprises two small blades (L1 and L2), said small blades (L1 , L2) being each fixed in an area (Zp) of the blade (L), symmetrically with respect to the center O of said blade (L), perpendicular to the longitudinal axis of said blade (L). 2- assembly according to claim 1, characterized in that each small blade (L1 or L2) has at one of its ends a sharpening in the form of bevels (B1 and B2) preferably placed symmetrically with respect to the axis B small blades (L1 or L2) the bevels being located on the sharpening side (A) of the main blade (L) 3- An assembly according to one of claims 1 and 2, characterized in that the distance (Lz) for positioning the blades (L1 or L2) at the two ends is such that one must: - respect a minimum distance d from the edge of the blade (L) which depends on the manufacturing possibilities for each tool application chosen -Stand in the positioning zone (Zp) as far as possible from the center of the blade O so as not to reduce the effectiveness of the single cut. 4- An assembly according to one of claims 1 and 3, characterized in that the small blades (L1, L2 are positioned on the blade (L) according to a coefficient Ce such that 0.8 <Ce <0.95, where Ce = Lz / lo, (Lz) being the distance between the center O of the blade (L) and the middle of the positioning zone (Zp) and the half length lo of blade (L). 5- Device (D) comprising two small blades (L1, L2) for the manufacture of an assembly according to one of claims 1 to 5. 6- An assembly according to any one of the preceding claims, characterized in that the device (D) fits into a known blade to form a new blade made in one piece by molding, or welding, and ready for employment.