High lift hydraulic system for an excavator

Details High lift hydraulic system for an excavator High lift hydraulic system for an excavator

1978-08-21

1980-08-26

Eickholt, E. H.

Excavating

Railway graders

Side former

414685, E02F 332

Patent

active

042188377

ABSTRACT:
The disclosure relates to an apparatus for increasing the lifting capacity of the boom of an excavator to lift heavy objects, while conjointly disabling the hydraulic circuit used for normal digging operations to avoid damaging the excavator. The apparatus includes a manually operated pilot valve for selectively applying a control fluid pressure to a relief valve for a hoist cylinder and a to relief valve for a digging bucket cylinder. The control fluid pressure biases the hoist relief valve to remain closed at hydraulic pressures above the normal relief pressure of the valve, and conjointly biases the bucket relief valve to open, thereby disabling the bucket.

REFERENCES:
patent: 2969844 (1961-01-01), Hamrick
patent: 3583585 (1971-06-01), Joyce
patent: 3584751 (1971-06-01), Bellart
patent: 3606049 (1971-09-01), Gordon
patent: 3874532 (1975-04-01), Metailler
patent: 3883023 (1975-05-01), Bernhoft
patent: 3922745 (1975-12-01), Lehman
patent: 3934742 (1976-01-01), Tennis
patent: 4044610 (1977-08-01), Oldaeus et al.

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