Measuring and testing – Liquid level or depth gauge – Float
Patent
1986-09-29
1988-03-15
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Float
73313, 200 84C, G01F 2362, H01H 3518
Patent
active
047304910
ABSTRACT:
This invention discloses a linear position detector including a pair of elongated electrically conducting members disposed in a parallel arrangement and a plurality of magnetically activated normally open switches disposed at regular intervals following the lengthwise direction of the two elongated electrically conducting members, wherein each of the magnetically activated normally open switches provides electrical connection between the two elongated electrically conducting members when the magnetically activated normally open switch is closed. The combination of the two electrically conducting members and the plurality of the magnetically activated normally open switches are enclosed within a sealed elongated tubular container. A float including at least one magnet is secured to the sealed elongated tubular container in a sliding relationship. The position of the float is determined from the ohmic resistances of two electrical circuits respectively comprising two portions of the two electrically conducting members divided by the float and one or more of the magnetically activated normally open switches closed by the magnetic force of the float, wherein the position of the float is determined independent of the ohmic resistance contributed by one or more of the magnetically activated switches closed by the magnet in the float.
REFERENCES:
patent: 3678750 (1972-07-01), DiNoia
patent: 3976963 (1976-08-01), Kubler
patent: 4056979 (1979-11-01), Bongort et al.
patent: 4384184 (1983-05-01), Alvarez
patent: 4567762 (1986-02-01), Hoppert et al.
patent: 4627283 (1986-12-01), Nishida et al.
patent: 4628162 (1986-12-01), Reinartz et al.
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