Patent ID: 7044481

Claim:
A wheel assembly that is arranged to support a load carrying platform and to roll on a surface, comprising: a generally planar primary wheel that is rotatable about a central axis, said primary wheel comprising two planar members secured one to the other, each said planar member having a plurality of stub axles at fixed locations extending perpendicularly toward said other planar member, said locations being angularly equidistant apart and equidistant as well from the central axis; and an even number of secondary wheels, one wheel mounted on each stub axle, said secondary wheels being of equal size and configured as a generally cylindrical disk having a diameter greater than the distance between angularly adjacent stub axles, said axles and wheels arranged such that at least two angularly adjacent wheels are in rolling contact with said surface at any one time, each of said secondary wheels arranged to freely rotate independently of any other secondary wheel, and independently as well of said primary wheel, said wheels positioned along their respective axles in a manner causing each wheel of an angularly adjacent pair of wheels that is in contact with said surface to roll along a separate and parallel track.