Patent ID: 8267744

Claim:
A drive unit for a grinding or cutting machine on a vehicle, the drive unit comprising: at least one drive shaft; a drive comprising an electric or hydraulic motor and having a recess for receiving at least a portion of the at least one drive shaft and having a drive coupling arranged to inter-fit with a portion of the at least one drive shaft for transmitting drive to the at least one drive shaft; a mount for mounting the drive unit to a linkage arm of the cutting machine; and at least two substantially circular cutting blades; wherein each cutting blade is mounted to the drive shaft or a respective drive shaft in a manner such that the cutting blades are spaced apart from one another and are drivable by the drive; wherein an envelope defined by the projection of a periphery of the cutting blades in a direction parallel an axis of the drive shaft, on which the at least one of the cutting blades is mounted, contains the drive; and wherein the recess is an elongated hollow portion which has two openings and wherein the hollow portion extends through the drive.