| 摘要 |
A four bar articulating support mechanism has four pivot axes with one of th e pivot axes being movable relative to a linkage of the support arm. The linkage has at least t wo arcuate slots therein that receive a pin. As the linkage is moved vertically relative to a mounting member, the pin slides in the at least two arcuate slots which pivot about a theoretical third pivot axis. The support arm has two brake shoes that are pivotally mounted on a mounting member, the brake shoes having a locking surface that corresponds to a locking surface on the linkage. The mechanism operates on a parallelogram linkage.
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