Patent ID: 7448194

Claim:
A mower comprising: a cutting blade housing having a top plate, a front vertical wall that depends from the top plate, and a cut-grass discharge port at one transverse end; rotating cutting blades that are arranged in a transverse direction within said cutting blade housing and each of which is capable of rotating about a vertical axis; a rear plate disposed behind said rotating cutting blades and along rotation zones of said rotating cutting blades; a rear vertical wall that is supported by said cutting blade housing in a position rearwardly of said rear plate and that forms a first ventilation hole in a center portion in said transverse direction of said cutting blade housing; an obstacle-surmounting ground unit for supporting a rear end portion of said cutting blade housing; and a supporting portion for supporting said ground unit so that at least a portion of said obstacle-surmounting ground unit protrudes from said ventilation hole to the rear of said ventilation hole.