Harvesters – Cutting – Rotating-cutting-disk type
Patent
1994-05-16
1995-01-24
Buiz, Michael Powell
Harvesters
Cutting
Rotating-cutting-disk type
56295, A01D 3400
Patent
active
053833295
ABSTRACT:
A combination lawn mower blade (1) with replaceable cutting edge pieces (2a, 2b) mounted on the forwardly rotating cutting surfaces (25a, 25b) of the blade (1). The elongated blade (1) has top and bottom surfaces (8) and (16), respectively, with tips (24a, 24b) in a centrally located hole (7) for attachment to an engine shaft of a rotary lawn mower or the like. The blade (1) has a set of grooves (12a, 12b, 15a, 15b) and steps (13a, 13b, 14a, 14b) cut into the forward cutting surfaces (25a, 25b). The cutting edge pieces (2a, 2b) have a sharp cutting surface (10a, 10b, 22) which inclines upwardly on top to a flat top surface (20) and also have a flat bottom surface (11 ). A channel (26) in the cutting edge pieces (2a, 2b) is cut between the top and bottom surfaces (20, 11) and contains a set of groves and steps matching those on the blade (1) so the cutting edge pieces (2a, 2b) slide onto the blade (1) from the direction of the center of the blade (1). The set of grooves and steps on the blade (1) is cut so that a space is left between the cut and the tip of the blade so that the cutting edge pieces (10a, 10b) are blocked from flying off the blade (24a, 24b) due to centrifugal force during rotation. The blade (1) may have upwardly curved portions (3a, 3b) on the rearward edges near the tips (24a, 24b) of the blade opposite the cutting edge pieces (10a, 10b) to help produce aerodynamic lifting of the grass for better cutting.
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Cornell, III Harold P.
Werginz Philip T.
Buiz Michael Powell
Livingston Edward M.
Switchblade, Inc.
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