DE19945117C2 - Cutter blade - Google Patents

Description

From DE 38 38 427 A1 is a mower according to the preamble of claim 1 Knife blade known when used in the same position by rotating the Mower blade around its vertical central axis used twice as long can be.

It is an object of the invention to determine the useful life of a cutter blade after The preamble of claim 1 further increase, whereby by a material savings in operating costs of a mower and thresher becomes.

This task is in a generic mower blade by the kenn Drawing features of claim 1 solved.

From US 3975891 a middle grind is known for a mowing knife, but It is a knife made up of several layers Purposes of a hard and sharp cutting edge with high elasticity of the Total knife.

With the invention it is achieved that the cutter blades by fewer Handles and repeated turning (about the longitudinal axis "L" or the transverse axis "Q") can change. Instead of two cutting surfaces, four can be used here Cutting surfaces are used.

With this knife blade, double the amount can be cut until it is all around is worn out.

An advantageous embodiment is specified in claim 2. The further ent Winding the cutter blade increases its stability, so the blade in the area the holes don't tear out.

Claim 3 also has an advantageous effect. The flatter shape allows that even old and tough grass is cut more easily, which also increases strength material consumption is reduced.

An embodiment of the invention is shown in the accompanying drawing and is described in more detail below:

The cutter blade is shown in "Figure 1 ". A rectangular cutter blade ( 4 ) is made of flat steel. This is provided with two holes ( 1 a, 1 b) of equal size, the center points (M1, M2) of which lie on an imaginary longitudinal axis (L) of the knife blade ( 4 ).

The diameter of the holes ( 1 a, 1 b) depends on the mark, their distance (a) to each other and the equally large distances (b1, b2) from the center of the hole (M1, M2) to the nearest first or second cutting side ( 5 or 6 ).

This knife has a center cut on each of the long sides ( 7 , 8 ).

A plurality of knives according to the invention (4) in the hole 1a are fixed in the conventional centrifugal and disc mower or harvester, so that the first half (9) to the transverse axis (Q) is covered and the second half (10) having a longitudinal side ( 7 ) comes to the cutting insert up to the transverse axis (Q). After their wear and tear (after loosening the fastening), the knife is turned 180 ° over the longitudinal axis (L) and then fastened again in hole 1 a, so that the long side ( 8 ) reaches the cutting insert up to the transverse axis (Q) . If this side is worn, the knife is loosened again, rotated 180 ° over the transverse axis (Q) and then fastened in hole 1 b. As a result, the first half ( 9 ) is used, analogous to the first procedure. Ultimately, four cutting edges were used and the knife is completely worn out.

Claims (3)

1.Rectangular cutter blade, in particular for rotary and disc mowers and combine harvesters, with two round holes of the same size, the centers of which lie on the longitudinal axis of the cutter blade and the distances from the closest narrow sides are the same, characterized in that the cutter blade ( 4 ) have continuous cutting edges on both longitudinal sides ( 7 , 8 ) with a central grinding. 2. Rectangular cutter blade, according to claim 1, characterized in that the blade ( 4 ) has a width of 5.5 cm and a length of 11 cm. 3. Rectangular cutter blade, according to claim 2, characterized in that the blade ( 4 ) has a thickness of 2.5 cm.