Geometrical instruments – Area integrators – Electrical
Patent
1981-06-09
1983-05-10
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
33 1H, 33134R, G01B 502
Patent
active
043823351
ABSTRACT:
A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence. A plurality of inflatable anchors provide discrete measurement points. A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod. The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight. A second sprocket wheel connected to the standpipe also engages the chain and drives a connected potentiometer. The head assembly converts the linear displacement of the metering rod to the rotary motion of the second sprocket wheel, which is measured by the potentiometer, producing a continuous electrical output.
REFERENCES:
patent: 3327396 (1967-06-01), Waddell
patent: 3380167 (1968-04-01), Abel, Jr. et al.
patent: 3483745 (1969-12-01), Ublacker
patent: 3538608 (1970-11-01), Bronson
patent: 3562916 (1971-02-01), Duckworth
patent: 3568326 (1971-03-01), Dodds
patent: 3885423 (1975-05-01), Schuermann et al.
patent: 4001942 (1977-01-01), Schuermann et al.
Besha Richard G.
Carnahan L. E.
Sartario Henry
Stearns Richard R.
The United States of America as represented by the United States
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