Excavating – Peat excavators
Patent
1975-09-22
1976-08-31
Eickholt, E. H.
Excavating
Peat excavators
37124, 91412, B60P 136
Patent
active
039771008
ABSTRACT:
An elevating scraper comprises a bowl which can be hydraulically raised and lowered, a motor-driven elevator which can be hydraulically raised and lowered, an ejector hydraulically movable forwardly from an aft position to eject material from the bowl and a hydraulic control system for operating the aforesaid components. The hydraulic control system enables selective independent operation of each component and further operates so that: (1) if there is no material in the bowl, the ejector can be moved forward while the elevator is lowered; (2) if the material is in the bowl the elevator automatically raises as the ejector moves forward and will lower automatically as the ejector is retracted; (3) if the elevator is partially or fully raised, a decrease in resistance on the ejector as it moves forward against a load, does not permit the elevator to be lowered; (4) the elevator may raise as required if it encounters increased resistance during operation; and (5) the elevator can be selectively lowered while the ejector is in forward position. The hydraulic control system includes a plurality of engine-driven pumps for supplying fluid to operate the components; an independently operable control valve for each component; a pilot pressure responsive double check valve arrangement between the elevator lift and ejector circuits to effect automatic elevator lifting; and a pressure responsive valve to permit the elevator to raise in the event of excessive loads thereon.
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patent: R26398 (1968-06-01), Hein
Brown Robert A.
Eickholt E. H.
Fiat-Allis Construction Machinery, Inc.
Kirby Thomas F.
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