Patent ID: 7690659

Claim:
A motorized roller disc for multi-directional operation under the control of a user comprising: a platform; a plurality of perimeter wheel assemblies mounted around the underside perimeter of said platform, each perimeter wheel assembly further comprising, a first yoke fixedly attached to said platform, and a perimeter wheel rotationally attached to said yoke, said perimeter wheel being radially aligned with respect to a center of said platform; a central pivot wheel assembly mounted at the center of the underside of said platform, said central pivot wheel assembly protruding slightly further than said perimeter wheel assembly, said central pivot wheel assembly comprising: a second yoke rotationally mounted to said platform, and a center wheel rotationally attached to said second yoke; a motor; a first drive train coupled between said motor and one perimeter wheel of said plurality of perimeter wheel assemblies; a second drive train coupled between the one perimeter wheel that is coupled with said first drive train and the remaining perimeter wheels of said plurality of perimeter wheel assemblies; whereby a user maintains directional control of said motorized roller disk by weight shifting.