Hoist having worm safety device

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

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Details

254340, 254343, 254351, B66D 148, B66D 114

Patent

active

046259465

ABSTRACT:
A hoist having a worm safety device in which the worm is continuously meshed with a worm wheel coupled to the drum. The worm is accelerated to a speed greater than that of the worm wheel and at a torque sufficient to overcome the frictional contact between the worm and worm wheel when the hoist direction is reversed.

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