Earth working – Automatic power control
Patent
1977-03-03
1978-10-17
Stouffer, Richard T.
Earth working
Automatic power control
172 4, A01B 63111
Patent
active
041203640
ABSTRACT:
A tractor mounted tool employs a programmable control device to change the angular attitude of the tool to a work surface at a preselected depth and also indicate the relative depth at which the tool is working. The control device positions a diverter valve to apply fluid power alternately between a depth positioning power cylinder and a pitch positioning power cylinder such that the attitude of the tool is automatically changed between a penetrating mode and a working mode at a preselected depth. A depth control circuit having a depth sensor and a depth selector which monitor the depth position of the tool in relation to a preselected depth and provide an output command when the tool is detected at the preselected depth. A pitch control circuit having a pitch sensor and a pitch selector which monitor the angular displacement of the tool and provide an output command at a preselected pitch. A control is connected to the depth and pitch control circuits and responsive to their commands to shift the position of the diverter valve and direct fluid power from the depth positioning cylinder to the pitch positioning cylinder when the tool is detected at a preselected depth and alternately shifts the diverter valve to redirect fluid power to the depth positioning cylinder when the tool is detected at a preselected pitch. The sensor generates a varying signal which is a function of tool position. The selector also generates an inverse reference signal which is a function of a position scale. These signals are compared by a bridge circuit including null detector.
REFERENCES:
patent: 3539018 (1970-11-01), Sprenkel
patent: 3860074 (1975-01-01), Maistrelli
patent: 4031964 (1977-06-01), Takahashi et al.
patent: 4044838 (1977-08-01), Wooldridge
American Tractor Equipment Corporation
Eckhoff Robert H.
Stouffer Richard T.
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