Moisture-detecting, switching device and a method of forming the

Details Moisture-detecting, switching device and a method of forming the Moisture-detecting, switching device and a method of forming the

1993-08-05

1995-12-19

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Liquid or moisture responsive

H01H 3500, H01H 1100

Patent

active

054770181

ABSTRACT:
One end of a dual-ended housing is closed off by a plug formed of a first constituent which is a water-soluble material and a second constituent which is a thermosetting resin and forms a readily-frangible structure in the plug. An electrical switch which has an actuating plunger is set, in the housing against the plug, so that the latter holds the plunger depressed/retracted. Moisture expands the water-soluble material which, in turn, destroys the plug integrity and, subsequently, the plug is so weakened that the plunger breaks through the frangible structure to actuate the switch.

REFERENCES:
patent: 3311721 (1968-03-01), Wright
patent: 3578767 (1971-05-01), Lee
patent: 3787650 (1974-01-01), Lewis
patent: 3983527 (1976-09-01), Ohsato et al.
patent: 4001531 (1977-01-01), Crockett, Sr.
patent: 4133016 (1979-01-01), Tanguy
patent: 4888455 (1989-12-01), Hanson
patent: 4910627 (1990-03-01), Mahlich

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