Water level sensing device having rupturable hygroscopic-type sw

Details Water level sensing device having rupturable hygroscopic-type sw Water level sensing device having rupturable hygroscopic-type sw

1975-07-28

1976-09-07

Scott, James R.

Electricity: circuit makers and breakers

Special application

Liquid or moisture responsive

73335, 733375, 200 6106, H01H 3518

Patent

active

039795691

ABSTRACT:
A water level sensing device includes a housing having a bottom opening and a micro-switch mounted in the housing above its bottom and provided with a spring loaded horizontally projecting actuating arm. An upper support arm depends from the actuating arm and terminates in a horizontal leg and a bottom horizontal arm is vertically adjustably supported on a wall of the housing below the horizontal leg. A loop of water absorbent paper is engaged and stretched between the horizontal arm and leg and retains the switch arm in actuated position until the loop is wetted and weakened to rupture and releases the switch arm to a deactuated position.

REFERENCES:
patent: 2191630 (1940-02-01), Shutts
patent: 3091674 (1963-05-01), Harris
patent: 3115557 (1963-12-01), Kjellman
patent: 3123687 (1964-03-01), Kjellman et al.
patent: 3142610 (1964-08-01), Gustafson
patent: 3163729 (1964-12-01), Flagg
patent: 3243536 (1966-03-01), Hansen
patent: 3288961 (1966-11-01), Thompson

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