Chain hoist with integral safety device

Details Chain hoist with integral safety device Chain hoist with integral safety device

1990-03-28

1992-07-07

Matecki, Katherine

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

182239, B66D 504

Patent

active

051276313

ABSTRACT:
A chain hoist for supporting and selectively raising and lowering a load includes a powered gearwheel that is connected through a frictional lock with one or more friction disks fixed for rotation with the hoist drive shaft so as to provide a slip clutch arrangement. The hoist additionally includes, between one of the friction disks and a pressure spring, a safety brake disk for rapidly halting movement of the load in the event that the rotation of the brake disk attains or exceeds a predetermined speed or rate deemed to be excessive. For this purpose, the brake disk carries a detent pawl that is pivotally displaced by centrifugal force and into engagement with a detent nose or projection defined on the hoist housing when the brake disk rotation exceeds the predetermined speed.

REFERENCES:
patent: 2663386 (1953-12-01), Fenley
patent: 4254941 (1981-03-01), Tanson
patent: 4461460 (1984-07-01), Telford
patent: 4463933 (1984-08-01), Schreyer et al.
patent: 4511123 (1985-04-01), Ostrobrod
patent: 4520998 (1985-06-01), Flaig
patent: 4846313 (1989-07-01), Sharp

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