Maximum lift system for hydraulic hoe

Details Maximum lift system for hydraulic hoe Maximum lift system for hydraulic hoe

1981-11-18

1982-12-28

Eickholt, E. H.

Excavating

Railway graders

Side former

37DIG9, 414685, 13759614, 13762563, E02F 332, F15B 1308

Patent

active

043654290

ABSTRACT:
A maximum lift system for a hydraulic hoe includes a dual pressure relief valve in the hoist circuit and an actuating valve that delivers a signal to the relief valve to increase hoist capacity and simultaneously causes operation of lockout valves to center the wrist control valve and thus lock the dipper in position.

REFERENCES:
patent: 2969844 (1961-01-01), Hamrick
patent: 3324881 (1967-06-01), Keir
patent: 3583585 (1971-06-01), Joyce
patent: 3584751 (1971-06-01), Bellart
patent: 3606049 (1971-09-01), Gordon
patent: 3865013 (1975-02-01), Mastaj
patent: 3874532 (1975-04-01), Metailler
patent: 3883023 (1975-05-01), Bernhoft
patent: 3922745 (1975-12-01), Lehman
patent: 3927603 (1975-12-01), Bernhoft
patent: 3934742 (1976-01-01), Tennis
patent: 4044610 (1977-08-01), Oldaeus et al.
patent: 4218837 (1980-08-01), Peterman
patent: 4288196 (1981-09-01), Sutton

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