Patent ID: 7299612
Filing Date: 2007-11-27
Classification: A01D,Y10S

Abstract:
1. A rotary mower blade for a power driven mower comprising an elongated body member, said body member having rotational mounting structure for mounting said blade to a power driven mower to thereby rotate said blade about an axis of rotation, said body member having at least one free end outwardly of said mounting structure, said free end having a first edge and a second edge interconnected by a tip, at least a portion of said first edge being tapered upwardly and inwardly at a small angle away from a bottom surface of said body member to create a sharpened cutting edge, said cutting edge of said first edge being a front leading edge, said front leading edge having an exposed outer portion, at least a portion of said second edge being a rear trailing edge, a plurality of air flow deforming elements in said free end, each of said elements being structured to disturb air flow along said blade from said mounting structure to said tip when said blade is rotating to enhance the creation of vortices which allow the flow to go from said first edge to said second edge, said plurality of elements comprising indentations in said front leading edge extending inwardly from said exposed outer portion of said front leading edge, each of said indentations being defined by a wall which extends upwardly from said bottom surface of said body member at an angle to said bottom surface, and said angle of said wall being a substantially larger angle than said small angle of said cutting edge to form an unsharpened blunt exposed surface for deforming air flow.