Automatic grab crane

Details Automatic grab crane Automatic grab crane

1974-09-23

1976-07-06

Eickholt, E. H.

Excavating

Peat excavators

212 42, 37183R, 37DIG1, 175 45, 214656, 60445, 60905, B66C 300, E02F 388, B65G 4700

Patent

active

039673944

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: 3033399 (1962-05-01), Conner et al.
patent: 3125819 (1964-03-01), Kaufmann
patent: 3310158 (1967-03-01), Reilly
patent: 3363929 (1968-01-01), Nelson
patent: 3378158 (1968-04-01), Lopez
patent: 3381939 (1968-05-01), Brown et al.
patent: 3523614 (1970-08-01), Walker
patent: 3768263 (1973-10-01), Olson et al.
patent: 3770140 (1973-11-01), Dukette
patent: 3817033 (1974-06-01), Appel et al.
patent: 3864915 (1975-02-01), Metailler

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