Patent ID: 8458998

Claim:
A rotary lawn mower cutting blade comprising: a center portion joined to respective intermediate portions which in turn are joined to respective first and second outer portions; first and second inwardly extending cutting portions defined by planar sections of material, the first inwardly extending cutting portion being joined to said first outer portion through a first downwardly extending end portion extending downwardly from said first outer portion, the second inwardly extending cutting portion being joined to said second outer portion through a second downwardly extending end portion extending downwardly from said second outer portion; wherein said first inwardly extending cutting portion has an inwardly extending leading cutting edge and an inwardly extending trailing edge, the leading cutting edge of said first inwardly extending cutting portion facing forward of said rotary lawn mower cutting blade and having a “V” shaped cross section, the trailing edge of said first inwardly extending cutting portion facing rearward of said rotary lawn mower cutting blade; and wherein said second inwardly extending cutting portion has an inwardly extending leading cutting edge and an inwardly extending trailing edge, the leading cutting edge of said second inwardly extending cutting portion facing rearward of said rotary lawn mower cutting blade, the trailing edge of said second inwardly extending cutting portion facing forward of said rotary lawn mower cutting blade and having a cross section different from a cross section of the leading cutting edge of the first inwardly extending cutting portion, and wherein the rotary lawn mower cutting blade is bent or twisted to provide an upward angling of the first inwardly extending cutting portion from the leading cutting edge thereof to the trailing edge thereof and to provide an upward angling of the second inwardly extending cutting portion from the leading cutting edge thereof to the trailing edge thereof.