Patent ID: 7740084

Claim:
A track assembly for use in a utility cart, the track assembly comprising: a frame including a tensioning structure adjustably spacing a first wheel a distance from a second wheel; a top tandem arm pivotally connected to said frame at a pivot member such that said top tandem arm will pivot freely relative to said frame in a substantially vertical plane, said first wheel being directly connected to a first end of said top tandem arm at one end of said frame; a bottom tandem arm having a front portion, a rear portion, a top portion, and a bottom portion, said top portion of said bottom tandem arm being pivotally connected to a second end of said top tandem arm, said pivot member being positioned between said first end and said second end of said top tandem arm; a front tandem arm idler wheel operably connected to said front portion of said bottom tandem arm; a rear tandem arm idler wheel operably connected to said rear portion of said bottom tandem arm; and a belt in engagement with said tandem arm idler wheels and said first and second wheels, said top tandem arm and said bottom tandem arm pivot in a first plane, and wherein said assembly further comprises an axle extending parallel to said bottom tandem arm and operably connected between said bottom tandem arm and at least one of said idler wheels, said axle being pivotally connected to said bottom tandem arm for pivoting in a second plane which is perpendicular to said first plane, so as to permit said idler wheels to adjust for both pitch and roll.