发明授权
US5492306A Air balance hoist with load position indicator 失效
带负载位置指示器的空气平衡提升机

Air balance hoist with load position indicator
摘要:
An air balancing hoist having one or more activators providing a signal when a load reaches one or more predetermined heights. The activators each comprise spring loaded plungers mounted to be shifted from an axial location by movement of the drum spool to a predetermined axial location.
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