| 摘要 |
A hoist mechanism for lifting a load includes a hollow support post, a threaded spindle rotatably mounted within the post, a traveling nut carried by the spindle for movement therealong during rotation of the spindle, a carriage engaged by the traveling nut to move along the spindle, and a motor for effecting rotation of the spindle. The post has a longitudinal opening aligned with the spindle having a width permitting the spindle to be moved laterally therethrough. The spindle is releasably connected to the motor drive shaft at one end and to a support bearing at the other end. Lift arms for supporting a load are connected to the carriage through the post opening. The hoist mechanism also includes a clutch mechanism providing a braking force during lowering and a safety switch assembly for terminating operation whenever the lift arms are blocked.
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