Geometrical instruments – Distance measuring – Scale reading position sensor
Patent
1990-08-13
1991-12-24
Levy, Stuart S.
Geometrical instruments
Distance measuring
Scale reading position sensor
73313, 73314, 73319, 340624, 32420724, G01F 2362, G01F 2372, G01F 2330
Patent
active
050740539
ABSTRACT:
A linear sensing device containing an electrically conductive reed strip which, in the presence of an external actuating horseshoe magnet, makes electrical contact to a resistive strip at the location of that magnet. The conductive reed strip is attached along one end to a supporting member, formed from a material with coefficient of thermal expansion similar to the reed strip, to prevent warping of the reed strip over a range of environmental temperatures. The sensing device is of a modular construction with elongate cap, to which the resistive strip is attached, and an elongate base, to which the reed strip support member is attached. The cap and base mate together to form an inner container which then slides into an outer container.
REFERENCES:
patent: 2484690 (1949-10-01), De Giers
patent: 3377537 (1968-04-01), Braitsford
patent: 3678750 (1972-07-01), DiNoia et al.
patent: 4175435 (1979-11-01), Hara
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patent: 4384184 (1983-05-01), Alvarez
patent: 4627283 (1986-12-01), Nishida et al.
patent: 4631375 (1986-12-01), McCann
patent: 4827769 (1989-05-01), Riley et al.
Hersey Measurement Co., Liquid Level Model VR-2 12/88.
Levy Stuart S.
Rhoa Joseph A.
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