| 摘要 |
A camera dolly has an upper arm pivotable on a lower arm. Chains and sprockets within the lower arm raise the upper arm when the lower arm is raised by a hydraulic actuator. Leveling rods maintain a camera platform in a level position as the arm is raised and lowered. A center plate in the lower arm and a brace plate in the upper arm increase the strength and stiffness of the arm. The ratio between the lower sprocket and upper sprocket within the lower arm is greater than 2:1, providing additional arm travel. A structural tube in the upper arm section provides a secure attachment point for a leveling head.
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