Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1976-07-30
1979-06-26
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
172 2, 172430, 340686, A01B 63111, G08B 2100
Patent
active
041594746
ABSTRACT:
A depth indicator is associated with a tractor. The depth indicator includes an above depth indicating circuit, an at depth indicating circuit and a below depth indicating circuit, with each circuit including visual indicators which are associated with each other so that once energized, a visual indicator will remain energized until another visual indicator is energized.
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 to a preselected pitch. A complementary pair of control circuits repositions the ripper tool when moving in the opposite direction.
REFERENCES:
patent: 2043413 (1936-06-01), Knox et al.
patent: 2607834 (1952-08-01), Connors
patent: 2851799 (1958-09-01), Meents et al.
patent: 2935957 (1960-05-01), Denton
patent: 3032754 (1962-05-01), DiPietro
patent: 3233349 (1966-02-01), Becton
patent: 3553670 (1971-01-01), Toles
patent: 4120364 (1978-10-01), Wooldridge
American Tractor Equipment Corporation
Caldwell Sr. John W.
Eckhoff Robert H.
Nowicki Joseph E.
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