Implement having parallel cylinder depth control and series cyli

Details Implement having parallel cylinder depth control and series cyli Implement having parallel cylinder depth control and series cyli

1986-09-05

1989-04-18

Stouffer, Richard T.

Earth working

Automatic power control

Land leveller type

91518, 91520, 280 4323, A01B 63111

Patent

active

048218065

ABSTRACT:
Hydraulic lift cylinders on a transversely extending implement frame, such as a multi-section hinged implement, are connected by valve and conduit structure to operate as single acting cylinders in parallel during an automatic depth control mode for individual cylinder control. An operator control valve and depth sensing valve permit the operator to change to a fast raise/fast lower mode wherein flow control structure causes the lift cylinders to operate substantially in series for raising and lowering the implement in level fashion across its width to and from a transport position.

REFERENCES:
patent: 3627053 (1971-12-01), Hook et al.
patent: 3630290 (1971-12-01), Williams et al.
patent: 3774696 (1973-11-01), Horsch
patent: 4343151 (1982-08-01), Lorimor
patent: 4427207 (1984-01-01), Gafford
patent: 4579038 (1986-04-01), Winter
patent: 4600060 (1986-07-01), Winter et al.

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