Timothy R Ohm: Resilient wheel structure. iRobot Corporation, Glen D Weinstein, Fish & Richardson P C, September 9, 2003: US06615885 (157 worldwide citation)

A resilient wheel structure having a rim and a hub interconnected by spokes, wherein the rim is sufficiently stiff to distribute a load to all of the spokes, and wherein the wheel is able to absorb loads in both the radial and axial directions. The rim comprises an inner and outer rim portion suppor ...

David L Landay, Charles F Chen: Method for pour casting roller skate wheel. Brookfield Athletic Shoe Company, July 29, 1986: US04603025 (8 worldwide citation)

A method of molding an integrated bearing and resilient wheel structure, for a roller skate or the like, and a resulting product having a single bearing. The bearing of the wheel has a centering surface aligned with the bearing axis and exposed for engagement by a mold. The mold defines the shape of ...