Tractor with hydraulic draft control

Details Tractor with hydraulic draft control Tractor with hydraulic draft control

1975-08-04

1977-11-08

Stouffer, Richard T.

Earth working

Automatic power control

Draft responsive

91189A, 91402, 91410, 172 9, A01B 63112

Patent

active

040571092

ABSTRACT:
The lower draft link of a tractor three-point hitch includes a sensor to sense draft loads imposed on the draft link by an earth-working implement. Variations in the draft load cause variations in the pressure of the fluid in the sensor from a preselected pressure. A pilot-operated, load control valve is connected to the sensor and is shiftable in response to pressure above and below the preselected pressure to actuate a control mechanism. The control mechanism actuates a direction control valve for directing fluid to and from a hydraulic lift cylinder for respectively raising and lowering the draft link to adjust the implement so as to maintain the preselected pressure and thus maintain the desired draft load.

REFERENCES:
patent: 2750862 (1956-06-01), Garmager
patent: 2940530 (1960-06-01), DuShane
patent: 3246700 (1966-04-01), Smelcer
patent: 3470963 (1969-10-01), Schneider et al.
patent: 3731744 (1973-05-01), Lipinski
patent: 3834738 (1974-09-01), Koch
patent: 3894476 (1975-07-01), Cobb

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