Patent ID: 7543435

Claim:
A mower unit comprising: a housing; a pair of cutting blades arranged inside said housing, each of the cutting blades being rotatable about a respective vertical axis supported by said housing, said pair of cutting blades being driven to be rotated in opposite directions; a baffle arranged generally between rotation regions of said pair of cutting blades to guide air flows generated by said pair of cutting blades, said baffle having an upper baffle portion located adjacent an upper region of said housing, a lower baffle portion located adjacent a lower region of said housing, and a vertically intermediate region between the upper baffle portion and the lower baffle portion, and said baffle defining an air passage for allowing the air flows to flow between said upper baffle portion and said lower baffle portion; wherein the upper baffle portion has a region that is continuous from the vertically intermediate region and whose cross section in a side sectional view extends upwardly in a forward direction and the lower baffle portion has a region that is continuous from the vertically intermediate region and whose cross section in the side sectional view extends downwardly in a forward direction; and wherein said baffle is in contact with a rear wall of the housing.