Blade configuration for cordless lawnmower

Details Blade configuration for cordless lawnmower Blade configuration for cordless lawnmower

1975-08-08

1977-06-28

Eskovitz, Jay N.

Harvesters

Cutting

Cutter members

56 119, A01D 5518

Patent

active

040316963

ABSTRACT:
In a cordless electric rotary lawnmower, for example, of the type having two counter-rotating blades, a blade configuration providing substantially improved efficiency and performance is disclosed. The lawnmower is battery operated and each blade in a twin blade mower, or the single blade of a single blade mower, is provided with a configuration to maximize cutting effectiveness, air flow and blade life. The blade comprises a generally rectangular strip of metal having a cross section defined by two parallel spaced flat surfaces joined at their ends by generally tapering surfaces. The flat surfaces extend across approximately 50 to 70% of the total width of the blade adjacent the blade ends and preferably extend across about 60%. In addition, the blade deviates from a rectangular strip in that its outer portions are twisted downwardly from a planar portion at the center to define a lift angle to obtain axial air flow. On the bottom surface of the outer portions, the tapering surface comprises a flat to provide a sharp cutting edge.

REFERENCES:
patent: 2909885 (1959-10-01), Smith
patent: 3028719 (1962-04-01), Jepson
patent: 3538692 (1970-11-01), Cope et al.
patent: 3911652 (1975-10-01), Houle

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