Patent ID: 6869153

Claim:
A track assembly for moving a vehicle, the assembly comprising: a) a beam having a top plate and first and second side plates depending from the top plate; b) a plurality of spaced track rollers mounted to the side plates beneath the top plate; c) a drive sprocket having alternating teeth and grooves and being supported on the beam adjacent one end thereof and above the top plate; d) an idler wheel supported by the side plates adjacent the end of the beam opposite from the drive sprocket; and e) an endless elastomeric track having outer and inner surfaces, the track being entrained about the rollers, the idler and the sprocket with its inner surface engaging the same, the inner surface including two laterally spaced rows of lugs, each of the lugs having first and second portions of different size and shape, the first portion being receivable in the grooves of the sprocket in driving relationship with the teeth, the second portion extending along and being engageable with an outer side surface of the sprocket when the first portion is in driving relationship with the sprocket; the idler wheel having a disc that runs on the inner surface of the endless track between the two laterally spaced rows of lugs.