| 摘要 |
Weight counterbalancing means for an articulating arm comprising first and second articulating arm members. One end of the first arm member is pivotally secured to a base and operative to pivot around a first horizontal axis. The second arm member is pivotally secured to the other end of the first arm member and is operative to pivot about a second horizontal axis. Each arm member is provided with a lever member that is part of a parallelogram system whose connecting nodes in part comprise the free end of the lever member of the first arm member, the pivot axis of the second arm member, and the free end of the lever member of the second arm member, a remaining connecting node in the parallelogram system being subject to a force that serves as a counterbalance for the articulating arm around the first horizontal axis, so that the articulating arm is held in equilibrium in every position.
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