Patent ID: 6848245

Claim:
A grass cutting blade for use in conjunction with a device for cutting grass or other vegetation into clippings, said grass cutting blade comprising: a mounting portion for mounting said grass cutting blade relative to said device such that said grass cutting blade can rotate about a substantially vertical axis; a first end extending in a first direction from said mounting portion; and a second end extending in a second direction from said mounting portion, said second direction being substantially opposite to said first direction, said second end itself comprising: a first cutting edge; a second cutting edge directed generally opposite to said first cutting edge; and an airfoil portion positioned between said first and second cutting edges, said airfoil portion configured to trail said first cutting edge and to provide airlift for clippings cut by said first cutting edge when said blade is rotated in a first direction, and said airfoil portion configured to trail said second cutting edge and to provide airlift for clippings cut by said second cutting edge when said blade is rotated in a second direction, said second direction being opposite to said first direction.