发明名称 Camera crane arm with balancing system
摘要 A camera crane has a spring balancing system for better maintaining the crane arm in balance as the crane arm is raised and lowered a spring link is pivotally attached to a support frame on a pivot access. Spring posts are attached to the crane arm section. Springs extend from the spring link to the spring posts. As the crane arm is raised, the springs exert a counterbalancing force. The spring balancing system can be disengaged by removing a pin extending through the spring link into the support.
申请公布号 US6345919(B1) 申请公布日期 2002.02.12
申请号 US19990391034 申请日期 1999.09.07
申请人 CHAPMAN/LEONARD STUDIO EQUIPMENT 发明人 CHAPMAN LEONARD T.
分类号 B66F11/04;(IPC1-7):G03B17/00;F16M13/00 主分类号 B66F11/04
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