Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1979-05-02
1981-04-14
Hix, L. T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
200 84R, 340625, 361178, H01H 3518
Patent
active
042622166
ABSTRACT:
A self-contained float switch for use in conjunction with water pumps and the like. The float switch operates to actuate and de-actuate such a pump at particular depths of water (L.sub.1) and (L.sub.2) which define an adjustable pumping range (R). In one embodiment the float switch consists of a cylindrical water-tight float (24) having an electrical cable (26) coming out of one end and terminating at a piggy-back plug (29) for insertion between a power output (20) and electric pump plug (18). The float contains six mercury switches (70-80) disposed obliquely to the axis of the float and equally spaced around the axis. Further circuitry including a relay (48) is provided to switch the heavier current load of the pump (12) in response to the electrical state of the mercury switches.
A further preferred embodiment of the float switch employs a double float system having an upper float (174) and lower float (176), each containing a single mercury switch (220 and 210 respectively) contained within the floats along the longitudinal central axis of the cylinder. The upper float (174) controls the maximum water level (L.sub.1) and the lower float (176) controls the minimum water level (L.sub.2).
REFERENCES:
patent: 2600659 (1952-06-01), Koch
patent: 2896038 (1959-07-01), Gerber
patent: 2979624 (1961-04-01), Askerneese
patent: 3212078 (1965-10-01), Shanahan
patent: 3291934 (1966-12-01), Mealy
patent: 3482237 (1972-12-01), Hamburg et al.
patent: 3483341 (1969-12-01), Reichensperger
patent: 3832702 (1974-08-01), Szeverenyi
patent: 3866470 (1975-02-01), Miller
patent: 4086457 (1978-04-01), Niedermeyer
Dwyer James L.
Hix L. T,.
S. J. Electro Systems Inc.
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