Earth working – Automatic power control – Draft responsive
Patent
1978-09-22
1980-11-04
Stouffer, Richard T.
Earth working
Automatic power control
Draft responsive
172 2, A01B 63112
Patent
active
042314321
ABSTRACT:
A control system is provided for a plow including forward and rearward hingedly connected frame sections each carrying a plurality of plow bottoms and forward, intermediate and rearward linkage assemblies each including a hydraulic actuating cylinder, supporting the forward end of the forward frame section, the junction between the frame sections and the rearward end of the rearward section. The control system includes electrical circuitry which controls solenoid-actuated valves of a hydraulic system with separate portions of the circuitry being operable for controlling the respective linkage assemblies but with an operation such that only one hydraulic cylinder is operable at any one time to minimize load requirements. In a raising operation, the forward and intermediate linkage assemblies are sequentially operated. Another feature is a draft control arrangement which includes a dither circuit operative to alternately adjust the forward and intermediate linkage assemblies.
REFERENCES:
patent: 3630290 (1971-12-01), Williams et al.
patent: 3736988 (1973-06-01), Cantral et al.
patent: 4064945 (1977-12-01), Haney
patent: 4107859 (1978-08-01), Keith
patent: 4120364 (1978-10-01), Wooldridge
patent: 4121852 (1978-10-01), Quanbeck
patent: 4132272 (1979-01-01), Holloway et al.
patent: 4133391 (1979-01-01), Richardson et al.
patent: 4159474 (1979-06-01), Wooldridge
AuBuchon F. David
International Harvester Company
Johnson Neal C.
Stouffer Richard T.
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