Patent ID: 8322858

Claim:
A camera crane mobile base, comprising: a chassis; two or more drive motor assemblies on the chassis, with each drive motor assembly including: an electric motor linked to an axle via a gear reduction; an inner wheel around the axle; an outer wheel around the axle; an axle attachment fitting movable from a first position non-rotatably attaching the outer wheel to the axle, to a second position where the outer wheel can rotate independently of the axle; and a wheel link moveable from a first position where the wheel link is engaged to both the inner wheel and the outer wheel, allowing both the inner and outer wheels to be driven by the electric motor, to a second position where the wheel link is disengaged from the inner wheel or the outer wheel, allowing the only the outer wheel to be driven by the electric motor; and an electrical power supply on the chassis separately linked to each of the electric motors through a controller allowing separate control of each motor.