Brake drum controlled hoist

Details Brake drum controlled hoist Brake drum controlled hoist

1977-10-12

1979-05-01

Blix, Trygve M.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

2541874, 188341, B66D 100

Patent

active

041519817

ABSTRACT:
A hoist is described which combines a block and tackle with a windlass. A drum brake and operating linkage therefor incorporated into the hoist is to automatically provide braking to prevent a load from causing unwanted reverse rotation of the windlass. Lowering of the load is achieved by applying against the pressure of the brake sufficient reverse rotational force to overcome the brake resistance and cause lowering. The brake shoes have a common pivot point whose location with respect to the brake drum can be changed to adjust the relative degree of braking provided by each of the shoes. The hoist also includes mechanism which prevents the hoist line from being wrapped around the hoist in a direction which would render the brake applying linkage ineffective.

REFERENCES:
patent: 1438394 (1922-12-01), Packer
patent: 2238254 (1941-04-01), Dick
patent: 2433692 (1947-12-01), Geer
patent: 3467359 (1969-09-01), Durand
patent: 3572482 (1971-03-01), Kalpas
patent: 3677376 (1972-07-01), Barajas
patent: 3850380 (1974-11-01), Kranefeld
patent: 3994476 (1976-11-01), Gennep

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