Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1984-08-01
1987-06-16
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318624, 104 71, 104 72, 33338, 33287, B64C 1706, E01B 3502
Patent
active
046738541
ABSTRACT:
An electronic levelling apparatus using an inclinometer mounted to a platform for sensing deviations from the horizontal and generating an output signal representative thereof, filtering the inclinometer output signal to remove electromagnetic and radio frequency interference, level-shifting the filtered inclinometer output signal to establish both positive and negative threshold voltages, determining positive and negative voltage level shifts to generate a level control signal therefrom and transmitting the level control signal to an actuating mechanism for maintaining the platform level.
REFERENCES:
patent: 2620571 (1952-12-01), Varian
patent: 3494299 (1970-02-01), Boyer
patent: 3659345 (1972-05-01), Plasser
patent: 3736486 (1973-05-01), Gould
patent: 3835546 (1974-09-01), Jaquet
patent: 3895287 (1975-07-01), Sun
patent: 3908163 (1975-09-01), Gilmore
patent: 3996454 (1976-12-01), Floyd
patent: 4184266 (1980-01-01), Hurni
patent: 4341160 (1982-07-01), Nielsen
patent: 4414541 (1983-11-01), Ho
patent: 4470199 (1984-09-01), Krezak
patent: 4542795 (1985-09-01), Yoshimura
patent: 4547972 (1985-10-01), Heidel
patent: 4557056 (1985-12-01), Kim
"Electromatic Tampers" mentions a patented Delta Levelling System which uses a precision designed pendulum arrangement (pp. 8 and 9).
Schaevitz "Operating Instructions, Installation Information, and Calibration Certificate for Servo Inclinometers".
Patton Wesley H.
Thompson Jeffrey L.
Keane Patrick C.
Shoop Jr. William M.
Southern Railway Company
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