| 摘要 |
A camera dolly (30) has a steering system (50) which provides conventional, crab, and round steering modes, selected by the operator via use of a single steering/shifting handle (44). The steering system (50) includes first (102) and second (104) transmissions and a differential (108). Chains (80, 82, 84, 86, 88, 92, 94) link sprockets on the transmissions and differential, to steer the wheels (45) of the camera dolly to appropriate angles, so that the dolly can roll easily and without wheel scrubbing. A dolly leg position compensator (300) adjusts the amount of steering angle correction provided by the differential, to compensate for changes in the dolly wheelbase/tread dimensions. Sprockets in the differential (108) are locked intop offset positions, during conventional and round steering, to maintain proper steering angle correction, even under heavy loads. Active idlers (75, 76, 77, 99) are mechanically linked within the steering system to automatically maintain appropriate chain tension, in all steering modes. |
