Balanced hoist apparatus

Details Balanced hoist apparatus Balanced hoist apparatus

1974-04-08

1976-02-03

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

254190R, B66D 304

Patent

active

039360342

ABSTRACT:
The traveling block of the derrick mounted on a floating barge is connected in off-center relation with a load supporting motion compensator cylinder, the sheaves being located and strung asymmetrically with respect to the center line of the motion compensator cylinder. The crown block sheaves are rotatable on axes which are skewed to reduce fleet angle of the line. Different size sheaves are strung differently and different numbers of line runs are strung differently to equalize the forces about the center of gravity of the mass of the traveling block.

REFERENCES:
patent: 1828897 (1931-10-01), Hollingsworth
patent: 2239493 (1941-04-01), Nichols
patent: 3258249 (1966-06-01), Williams
patent: 3658298 (1972-04-01), Moore et al.
patent: 3834672 (1974-09-01), Hawley et al.

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