Measuring and testing – Liquid level or depth gauge – Float
Patent
1978-11-28
1981-01-13
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Float
331266, 73321, 73313, G01F 2310
Patent
active
042442192
ABSTRACT:
A liquid level meter having a first and second rotatable shaft mounted within a housing coaxially one within the other and coupled for relative rotation. A drum is mounted on one shaft and has a float suspended therefrom, for engagement with the liquid. Detecting means for sensing the torque on the drum is provided comprising an energy source and an energy receiver and a pair of relatively movable shield means located therebetween. One of the shield means is conjointly movable with one shaft and the other shield means is conjointly movable with the second shaft. Each of the shield means has spaced apertures aligned respectively with each other to permit selective passage of energy between the source and receive depending upon the degree of relative movement of the shield plates. A signal is produced in response to the sensing of energy variation which operates a motor coupled to one shaft to drive the same and consequently to rotate the other shaft in the direction of the torque exerted on the drum. An indicator showing the level of liquid in response to the degree of movement of the motor is also provided.
REFERENCES:
patent: 2766623 (1956-10-01), DeGiers
patent: 3319476 (1967-05-01), MacKenzie
patent: 3482447 (1969-12-01), Bennett
patent: 3517282 (1970-06-01), Miller
patent: 3685358 (1972-08-01), Hubner et al.
patent: 4065968 (1978-01-01), Sunagawa
Publication: "Electromagnetic Fields, Energy, and Forces", Robert M. Fano et al., pp. 246-249.
Publication: "Radio Shack Dictionary of Electronics", R. F. Gray, 1974-1975, pp. 80, 226.
Sakura Instrument Co. Ltd.
Yasich Daniel M.
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