Patent ID: 7083012

Claim:
A patient support comprising: a bed frame; a plurality of casters to support the bed frame on a floor; a power source; a motor operably coupled to the power source; a drive track operably coupled to the motor to move the bed frame across the floor, the drive track including a first roller driven by the motor, a second roller, and a belt supported by the first and second roller, the belt including a plurality of belt teeth, the first roller and second roller each include a plurality of roller teeth located on their outer surface, wherein at least a portion of the plurality of roller teeth are sized to engage at least a portion of the plurality of belt teeth, wherein the rollers are spaced apart from the floor; a pair of side plates to rotatably support the first roller and the second roller; a drive shaft extending through the first roller and including an axis of rotation, the drive shaft coupled to the motor to drive the first roller; and a lifter to pivot the second roller about the axis of rotation between a first position with at least a portion of the belt contacting the floor and a second position with the belt out of contact with the floor.