Tractor and towed implement with elevation control system for im

Details Tractor and towed implement with elevation control system for im Tractor and towed implement with elevation control system for im

1983-12-29

1987-01-20

Stouffer, Richard T.

Earth working

Automatic power control

Draft responsive

91388, 172413, A01B 63112

Patent

active

046374744

ABSTRACT:
The elevation of a tool carried by an implement towed by a tractor is determined by a hydraulic motor mounted on the implement adjusting the wheel height. A servo valve mounted on the tractor responsive to line pressure controls the hydraulic motor. An operator actuated vent valve mounted on the tractor vents line pressure to control the servo valve. A tool elevation responsive feedback vent valve mounted on the implement increasingly vents line pressure as the hydraulic motor changes tool elevation, to negate the effect of venting by the operator actuated vent valve. When hydraulic motor movement equals movement of the operator actuated vent valve, the feedback venting equals that of the operator actuated bent valve. A second negative feedback on the servo motor pistons then returns the servo valve to neutral closed position and change in tool elevation stops. A load sensor in the connection between the tractor and towed implement responds to tension in excess of an adjustable pressure determined tension to raise the tool until the tension drops, whereupon the tool level returns to its initial level. The direction of the tool may also be varied in response to the speed of the tractor motor.

REFERENCES:
patent: 2989950 (1961-06-01), Lockman
patent: 3211182 (1965-10-01), Gyurik et al.
patent: 3627053 (1971-12-01), Hook et al.
patent: 3670822 (1972-06-01), Reinhardt
patent: 3988966 (1976-11-01), Leonard
patent: 4077475 (1978-03-01), Hino et al.
patent: 4254689 (1981-03-01), Leonard
patent: 4265331 (1981-05-01), Leonard

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