Tractor and towed implement with elevation control system for implement including pressure responsive valve actuator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 20, 1987
Issued Date -
N/A
app pub date -
Dec 29, 1983
filing date -
Nov 5, 1974
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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