Blade configuration for cordless lawnmower

Details Blade configuration for cordless lawnmower Blade configuration for cordless lawnmower

A - Human Necessities

01

D

56/58

A01D 34/73 (2006.01)

Patent

CA 1059323

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 lawn mower 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 maximum 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.

256817

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