Device in rope hoists for limiting speed when lowering a load

Details Device in rope hoists for limiting speed when lowering a load Device in rope hoists for limiting speed when lowering a load

1975-07-14

1977-01-18

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

188 727, B66D 500

Patent

active

040035506

ABSTRACT:
A device in rope hoists for limiting speed when lowering a load, comprising a rotatable drum, around which the rope is to be wound, a first friction surface on one end side of said drum, and a second friction surface, unrotatable in relation to the shaft. The friction surfaces are arranged to be moved into engagement with each other automatically in response to the load to be lowered through the use of a helical surface. The friction force between the friction surfaces is proportional to the weight of the load to be lowered.

REFERENCES:
patent: 380173 (1888-03-01), Bovensiep
patent: 612673 (1898-10-01), Reidy et al.
patent: 659093 (1900-10-01), Ockers
patent: 955243 (1910-04-01), Witt
patent: 1578108 (1926-03-01), Tobias
patent: 2561832 (1951-07-01), Wilson

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