Patent ID: 6357765
Filing Date: 2002-03-19
Classification: B60B,B62B,Y10T

Abstract:
A wheel assembly comprising:a primary wheel including a generally planar wheel holder that is rotatable about a central axis, said wheel holder comprising two parallel, spaced apart plates, said plates supporting a plurality of axles extending perpendicularly therebetween, one axle for each secondary wheel; and at least four secondary wheels of equal diameter rotatably mounted on the holder at locations equidistant apart, one from the next, and equidistant as well from the central axis of the holder, the distance between each wheel location being less than the diameter of said wheels, each said secondary wheel including a cylindrical, disk section having an edge bearing surface, and having a boss extending coaxially from one side thereof, the length of said boss being equal to or greater than the thickness of said disk section.