Harvesters – Cutting – Cutter members
Patent
1996-08-01
2000-04-25
Ricci, John A.
Harvesters
Cutting
Cutter members
56 175, 56DIG20, A01D 3463
Patent
active
060529792
ABSTRACT:
A blade for a rotary mower, in particular lawnmowers, with a cup-like downward open cover (21) for the seating of the blade (1) presenting two sails (4, 4') that are provided on their front longitudinal edges (5, 5') in the direction of rotation with cutting edges (6, 6). The cutting edges of the blade sails of the blade according to the present invention constitute several cutting planes, whereby the outer cutting edge section (8) within the region of the sail extremities is located below the plane of the blade's hub portion (3). To this outer cutting edge section (8, 8') is attached a central cutting edge section (10, 10') that curves above the plane of the hub portion (3) and changes over to an inner cutting edge section (13, 13') that drops off toward the hub portion (3). The sail extremities (7, 7'), of which the front longitudinal edges are positioned in the direction of rotation below the plane of the hub portion (3), are designed as guide surfaces (36, 36') at a slant with respect to the blade's plane of rotation, with such guide surfaces curving upwards from the front longitudinal edges of the blade's sails (4, 4') in the direction of rotation toward the rear longitudinal edges. The rear longitudinal edges in the direction of rotation of the blade's sails extend within or above the plane of the hub portion (3). The guide surfaces (36, 36') cause that the material cut by the outer cutting edge section (8, 8') is lifted, thus repeatedly reaching the sphere of action of the central and the inner cutting edge sections; this brings about that the cut material is repeatedly reduced in size until it is pulverized. The invention further relates to a rotary mower with a cup-like, downward open cover, in which is seated the blade according to the present invention. Further, the invention relates to a retrofit kit for a conventional lawnmower presenting a cover with a lateral ejection opening.
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Ricci John A.
Tutschka Alfred
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