Earth working – Automatic power control – Land leveller type
Patent
1978-10-13
1980-09-09
Hum, Vance Y.
Earth working
Automatic power control
Land leveller type
A01B 63114
Patent
active
042212669
ABSTRACT:
A system is provided for monitoring and controlling the level of a working element of an agricultural implement including a digital comparator which compares stored digital signals with digital signals corresponding to the actual position of the working element. A secondary valve is controllable from the digital comparator to limit lowering movement. The actual position digital signals are developed by counters which count clock pulses during a pulse developed by a transducer circuit and having a duration corresponding to the vertical position of the working element. Such actual position digital signals are applied to latching circuits from which a signal may be applied upon operation of a memory reset button to memory latch circuits operative to provide the stored signals and such signals may also be applied to display latching circuits.
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patent: 4077475 (1978-03-01), Hind et al.
patent: 4112429 (1978-09-01), Tsuha
patent: 4120364 (1978-10-01), Wooldridge
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patent: 4138723 (1979-02-01), Nehmer et al.
patent: 4156317 (1979-05-01), Schmidt
AuBuchon F. David
Hum Vance Y.
International Harvester Company
Kamp Ronald C.
Rudy Douglas W.
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