Hoist drum drive control

Details Hoist drum drive control Hoist drum drive control

1976-12-03

1979-01-30

Blix, Trygve M.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

60483, B66D 130

Patent

active

041368550

ABSTRACT:
A hoist drum drive control is provided with both variable displacement and fixed displacement motors geared to the drum and connected in parallel to a variable displacement pump. During high speed hoisting the variable displacement motor is shifted to zero displacement until the back pressure reaches a certain level at which time the displacement is automatically increased until a balanced condition is achieved. When lowering heavy loads a feedback to the variable pump decreases its displacement to prevent over speeding the engine.

REFERENCES:
patent: 3698690 (1972-10-01), Beaver
patent: 3757524 (1973-09-01), Poynar et al.
patent: 3768263 (1973-10-01), Olson et al.
patent: 3849985 (1974-11-01), Ratliff et al.
patent: 3972186 (1976-08-01), Humphreys

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