Pneumatic-electrical control device

Details Pneumatic-electrical control device Pneumatic-electrical control device

1994-12-02

1996-07-23

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

200 81R, 241 325, H01H 3526, B02C 2300

Patent

active

055391664

ABSTRACT:
An electrical kitchen appliance, such as a garbage disposal unit, is operated by providing a pneumatically actuated switch which prevents the user from being shocked due to the presence of water in the area. The pneumatic switch can be moved between an on and an off position so that electrical current is supplied or cut off from the appliance. A non-electrically conductive air conduit is connected to the switch and leads to a remote location from the appliance. A bellows is supplied at the remote location and forces air through the conduit to the pneumatic switch, switching the appliance on or off. Because the bellows is not electrically connected to the switch and is located at remote distance, electrical shock due to the presence of water is eliminated.

REFERENCES:
patent: 3571821 (1971-03-01), Kaiser
patent: 3902028 (1975-08-01), Tremain
patent: 4124789 (1978-11-01), Preece
patent: 4150264 (1979-04-01), Lieberman
patent: 4209678 (1980-06-01), Hussey
patent: 4647738 (1987-03-01), Diamond
patent: 4668847 (1987-05-01), Greene
patent: 4754107 (1988-06-01), Tracey
patent: 5118909 (1992-06-01), Husting
patent: 5249749 (1993-10-01), Krebsbach

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