Electricity: circuit makers and breakers – Float – Float and pressure
Patent
1989-02-28
1990-02-27
Cohan, Alan
Electricity: circuit makers and breakers
Float
Float and pressure
137362, 137312, 137412, H01H 3518
Patent
active
049048309
ABSTRACT:
The System is designed to shut-off the flow of liquid in a conduit, unattended, i.e., automatically, in the event of a liquid conduit rupture, liquid overflow, or the like. A float which carries a mercury switch is set over a recess formed therefor and into which liquid can flow and collect. The float rises with the collected liquid, and the mercury switch activates a solenoid valve which is interpositioned in a pressured-liquid conduit, to halt the flow of liquid through the conduit. The recess is formed in a lowermost portion of an area in which the subject conduit is sited.
REFERENCES:
patent: 3473553 (1969-10-01), Collins
patent: 3944770 (1976-03-01), Pepper
patent: 4223190 (1980-09-01), Olson
patent: 4305420 (1981-12-01), Nussdorf
patent: 4418712 (1983-12-01), Braley
patent: 4540891 (1985-09-01), Keener
patent: 4778951 (1988-10-01), Crowell
patent: 4796658 (1989-01-01), Caple
patent: 4805662 (1989-02-01), Moody
Cohan Alan
Murphy Bernard J.
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