Automatic grab crane

Details Automatic grab crane Automatic grab crane

1976-05-20

1977-10-18

Eickholt, E. H.

Excavating

Processes

37183R, 37 71, 37DIG8, 212 42, 212 84, 212 86, 294110R, E02F 100

Patent

active

040539997

ABSTRACT:
A time saving automatic hydraulic control for that sequence in operations in which a grab excursioning out of sight of the operator, is sequentially lowered open to engage work material, closed to pick up a load, and then hoisted with its load and emptied. A logic circuit is activated to stop the lowering within an adjustable timed period after initial work engagement to provide desired penetration of the work material by the grab followed by a minimal time for grab closing to provide an adjustable constancy of loads and a positive sequential control for the lowering and hoisting modes.

REFERENCES:
patent: 2947397 (1960-08-01), Pietsch
patent: 3125819 (1964-03-01), Kaufmann
patent: 3378158 (1968-04-01), Lopez
patent: 3381939 (1968-05-01), Brown et al.
patent: 3523614 (1970-08-01), Walker
patent: 3770140 (1973-11-01), Dukette
patent: 3780990 (1973-12-01), Edlund et al.
patent: 3799505 (1974-03-01), Duncan
patent: 3819156 (1974-06-01), Sieracki
patent: 3985384 (1976-10-01), Hahn

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