Patent ID: 6848246

Claim:
A mower unit system attachable to a vehicle body comprising: a mower deck having a top board and one front wall and one side wall depending from said top board, said mower deck defining a grass discharge opening at an opposite side of said side wall; a plurality of rotary blades juxtaposed inside said mower deck to be rotatable about vertical axes, all of said rotary blades being rotatable in the same direction so that a front half, with respect to a traveling direction, of a track of rotation of each rotary blade points toward the side having said grass discharge opening; a rear baffle depending from said top board for enclosing said rotary blades in combination with said front wall, and surrounding, in form of a concentric part circle, a rear portion of the track of rotation of each rotary blade; and a front baffle and a separate mulching baffle, each alternatively and selectively attachable to said mower deck to be located forwardly of the tracks of rotation of said rotary blades; said front baffle including curved segments each for surrounding, in the form of a concentric part circle, a front portion of the track of rotation of one rotary blade, and a counter curved segment for connecting adjacent pair of said curved segments, thereby to guide grass clippings cut by the rotary blades located upstream with respect to a grass discharging direction, into areas of rotation of the rotary blades located downstream with respect to the grass discharging direction; said mulching baffle, in combination with said rear baffle, defining a mulching chamber surrounding the track of rotation of each rotary blade.