| 摘要 |
A camera dolly (20) has an upper arm (22) pivotable on a lower arm (32). Chains (52) and sprockets (58, 62) within the lower arm (32) raise the upper arm (22) when the lower arm is raised by a hydraulic actuator (70). Leveling rods (54) maintain a camera platform (26) in a level position as the arm is raised and lowered. A center plate (86) in the lower arm and a brace plate (104) 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 (100) in the upper arm section provides a secure attachment point for a leveling head.
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