| 摘要 |
A camera crane includes a telescopically extendible arm with a camera platform pivotally attached to the front end of the arm. An arm support can support a back section of the arm at two or more positions. Consequently the pivot axis of the arm can be shifted to the front or rear, to change rear clearance requirements, counterweight requirements, and the reach of the arm. A leveling system on a nose assembly includes at least one motor within a sealed motor housing. When the head moves to an out of level position, an electronic controller energizes the motor which exerts torque to return the head to level. |
