Patent ID: 8733478

Claim:
A camera crane mobile base, comprising: a chassis; a front left drive motor assembly, a front right drive motor assembly, a rear left drive motor assembly, and a rear right drive motor assembly, on the chassis, each including an electric motor linked to an axle via a gear reduction and at least one wheel on the axle; a middle left drive motor assembly and a middle right drive motor assembly, each including an electric motor linked to a middle axle via a gear reduction and at least one wheel on the middle axle, and a spring suspension assembly attached to the chassis and supporting the middle axle, with the spring suspension assembly comprising a chassis plate attachable to the chassis, an outer plate attached to the motor, an upper spring having an inner end attached to the chassis plate and an outer end pivotally attached to the outer plate, and an lower spring having an inner end attached to the chassis plate and an outer end pivotally attached to the outer plate; and an electrical power supply on the chassis linked to each of the electric motors.