Pressure operated electric switch and alarm system using such sw

Details Pressure operated electric switch and alarm system using such sw Pressure operated electric switch and alarm system using such sw

1978-05-19

1981-04-21

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340573, 340666, 200 85R, G08B 1314

Patent

active

042635861

ABSTRACT:
A pressure operated electrical switch and an alarm system for use in hospitals and nursing homes. The switch is constructed such that a force is applied to a pressure plate therein, and once the load is reduced below a predetermined value the pressure plate will move under spring influence to close/open a microswitch or electrical contact means. The normal force applied to the pressure plate is the load on the leg of a hospital bed when occupied. If the bed occupant gets out of the bed the load on the pressure plate is reduced below the predetermined value and the consequent movement of the pressure plate opens/closes the switch means to actuate the alarm.

REFERENCES:
patent: 1758546 (1930-05-01), Wantmann
patent: 2458192 (1949-01-01), Niles
patent: 2818477 (1957-12-01), Gollhofer
patent: 3656141 (1972-04-01), Hill
patent: 3824536 (1974-07-01), Cherico
patent: 3852736 (1974-12-01), Cook et al.
patent: 3961201 (1976-06-01), Rosenthal

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