Earth working – Automatic power control
Patent
1975-04-21
1977-08-30
Shapiro, Paul E.
Earth working
Automatic power control
A01B 63111
Patent
active
040448380
ABSTRACT:
A tractor mounted ripper tool employs a programmable control device to change the angular attitude of the ripper blade at a preselected depth.
The control device positions a diverter valve to alternately apply fluid power between a depth positioning power cylinder and a pitch positioning power cylinder such that the attitude of the ripper blade will automatically be changed between a penetrating mode and a ripping mode at a preselected depth. A depth control circuit having a depth sensor switch and a depth selector switch detects the vertical displacement of the ripper tool and provides a command at a preselected depth. A pitch control circuit having a pitch sensor switch and a pitch selector switch detects the angular displacement of the ripper tool and provides a command at a preselected pitch. A control relay is connected to the depth and pitch control circuits and is responsive to the commands thereof to shift the position of the diverter valve and direct fluid power from the depth positioning cylinder to the pitch positioning cylinder when the ripper tool is detected at a preselected depth and alternately shifts the diverter valve to direct fluid power to the depth positioning cylinder when the ripper tool is detected at a preselected pitch. A complementary pair of control circuits repositions the ripper tool when moving in the opposite direction.
REFERENCES:
patent: 2577351 (1951-12-01), Mott
patent: 2871963 (1959-02-01), Harris et al.
patent: 2969119 (1961-01-01), Barry
patent: 2970653 (1961-02-01), Hershman
patent: 3042119 (1962-07-01), Talak
patent: 3503456 (1970-03-01), Larson
patent: 3539018 (1970-11-01), Sprenkel
American Tractor Equipment Corporation
Shapiro Paul E.
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