Patent ID: 6581703
Filing Date: 2003-06-24
Classification: B62D,B64D,B64F,B66F

Abstract:
A powered vehicle arrangement comprising,a frame having a shape of a circular disk with a vertical axis defined at the center of said circular disk, said frame characterized by an outer frame radius as measured from said vertical axis, a bar connected to a device to be pushed or pulled, a hitch rotatably coupled about the outer perimeter of said frame, said hitch being arranged and designed for selective coupling or uncoupling of said bar, said hitch characterized by an outer hitch radius as measured from said vertical axis of said frame; first and second drive wheels coupled to said frame, each of said drive wheels capable of powered rotation about a horizontal axis that intersects said vertical axis, each of said drive wheels capable of forward and rearward rotation about said horizontal axis, at least one castor mounted to said frame for supporting said frame on the ground by at least said first and second drive wheels and said castor, said vehicle having no equipment mounted on said frame which extends beyond said outer hitch radius when said vehicle spins about said vertical axis, means for independently controlling the direction of rotation and the speed of said first and second drive wheels, whereby when said bar is coupled to said hitch and said first and second drive wheels are rotated in opposite directions and at substantially the same speed, said vehicle spins about said vertical axis and no equipment of said vehicle extends outwardly from said vertical axis beyond said outer hitch radius.