CAMERA DOLLY

摘要

A camera dolly has wheels that can be positively steered via a steering bar operating a corrective and crab mode steering system. A spring holds a steering transmission of the steering system into the crab mode. The dolly operator may shift from the crab mode into the corrective mode by momentarily pushing down on a plunger on the steering bar, when the wheels are straight. After performing a corrective steering maneuver, the spring causes the steering system to automatically return to the crab steering mode when the wheels are steered back to the straight position.

主权项

1. A camera dolly comprising:
a chassis; first, second, third and fourth kingpins rotatably supported on the chassis; a steering mode transmission on the chassis having a plurality of vertically stacked sprockets and providing first and second steering modes; a chain extending around each of the stacked sprockets and around at least one of the kingpins; at least one shift pin movable into an opening in at least one of the sprockets; and at least one spring exerting spring force on the shift pin in a first vertical direction and holding the steering mode transmission into the first steering mode, with the steering mode transmission shiftable into the second steering mode by moving the shift pin in a second vertical direction, opposite from the first vertical direction, and against the spring force.