Patent ID: 7730708

Claim:
A mower blade assembly comprising: a blade bar having two oppositely disposed generally planar cutting ends lying in a generally horizontal plane and having a leading edge with respect to said blade bar direction of operational movement within said horizontal plane, each said cutting end having an elongated notch extending along said cutting end leading edge and extending in the longitudinal direction of said blade bar and within said horizontal plane; a pair of bottom cutting blades removably mounted to said blade bar and having an elongated cutting edge, each bottom cutting blade being mounted to one said cutting end of said blade bar with said bottom cutting blade elongated cutting edge being positioned below one said cutting end notch and also being a leading edge with respect to the bottom cutting blade direction of operational movement; and a pair of top cutting blades removably mounted to said blade bar and having an elongated cutting edge, each top cutting blade being mounted to one said cutting end of said blade bar and having said top cutting blade elongated cutting edge being positioned above one said cutting end notch and being aligned generally parallel with said bottom cutting blade elongated cutting edge.