Overload protection apparatus for hoisting machine

Details Overload protection apparatus for hoisting machine Overload protection apparatus for hoisting machine

B - Operations, Transporting

66

D

254/87

B66D 3/20 (2006.01) B66D 1/58 (2006.01)

Patent

CA 1062231

OVERLOAD PROTECTION APPARATUS FOR HOISTING MACHINE Abstract of the Disclosure The disclosure relates to an overload protection apparatus for hoisting machine such as rope hoists or chain blocks. The apparatus has a slipping gear unit and a ratchet gear unit which are arranged on a shaft in a reduction gear assembly. The ratchet gear unit is adapted to prevent rotation of slipping gear unit only when the hoisting machine is lowering the load, so as to prevent uncontrolled slipping of a partially hoisted load but to allow the slipping gear unit to slip freely if an attempt is made to lift an excessive load. This reduces the danger inherent in overload protection apparatus having a slipping gear unit that a partially hoisted load may be allowed to fall uncontrollably.

270710

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