Device for electrohydraulically lifting agricultural implements

Details Device for electrohydraulically lifting agricultural implements Device for electrohydraulically lifting agricultural implements

1979-09-10

1981-11-24

Stouffer, Richard T.

Earth working

Automatic power control

Draft responsive

91361, 91451, A01B 63112

Patent

active

043018700

ABSTRACT:
A device for hydraulically lifting agricultural implements by a lifting jack, utilizing a pump with constant stroke volume and a stepless distributor. A flow pressure regulator of the pump is piloted by the pressure of the lifting jack, a downstroke valve is provided for lowering the implements, and a relay valve connects to the reservoir the piloting pressure of the regulator in the downward movement of the implements. A reducing valve fed by the flow circuit of the pump feeds at least one pilot electrovalve of the stepless distributor.

REFERENCES:
patent: 3025717 (1962-03-01), Christenson
patent: 3172479 (1965-03-01), Ashfield et al.
patent: 3246701 (1966-04-01), Schulz
patent: 3847180 (1974-11-01), Kroth et al.
patent: 3874269 (1975-04-01), Walters
patent: 4030295 (1977-06-01), Khatti et al.

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