Pneumatically actuated hospital signaling device

Details Pneumatically actuated hospital signaling device Pneumatically actuated hospital signaling device

1989-12-15

1992-05-12

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 81H, H01H 3524

Patent

active

051130483

ABSTRACT:
A positionally neutral, liquid tight signaling device includes an electrical contact switch remotely actuated by a pneumatic squeeze bulb. A gas permeable, flexible diaphragm divides the internal chamber of the signaling device into a switching portion and an isolated actuating portion. First and second electrical contacts within the switching portion are biased into an open circuit position by a compression spring. The selective collapsing of the squeeze bulb creates an overpressure in the actuating portion of the internal chamber, collapsing the diaphragm and shifting the two electrical contacts into abutting, electrically conducting relationship.

REFERENCES:
patent: 2875291 (1959-02-01), Armstrong et al.
patent: 4461181 (1984-07-01), North, Jr.
patent: 4754107 (1988-06-01), Tracey

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