Pressure sensitive switch

Details Pressure sensitive switch Pressure sensitive switch

1978-05-19

1979-10-23

Tolin, Gerald P.

Electricity: circuit makers and breakers

Weight

200 86R, 200264, 340666, 338114, H01H 902

Patent

active

041722167

ABSTRACT:
A resilient insulative layer of a plastic foam material is sandwiched between a dimpled carbon powder loaded plastic sheet and a resilient carbon powder loaded plastic foam pad. The dimples extend part way through holes provided therefor in the insulative layer. This sandwich assembly being placed under a bed mattress serves as a mattress-switch indicating electrically by contact between the sheet and the pad the presence of an occupant in the bed or his absence by lack of such contact. The characteristic time of the pad material for returning to its original shape is substantially longer than the corresponding return time of the insulative layer. Reliable operation is obtained for a wide range of occupant weights regardless of the weight(s) of the previous occupants.

REFERENCES:
patent: RE28754 (1976-03-01), Cook et al.
patent: 2260715 (1941-10-01), Ketchem
patent: 2818477 (1957-12-01), Gollhofer
patent: 3487451 (1969-12-01), Fontaine
patent: 3715541 (1973-02-01), Koenig
patent: 3830991 (1974-08-01), Durocher
patent: 3879586 (1975-04-01), Durocher
patent: 3959610 (1976-05-01), Finnegan
patent: 3960044 (1976-06-01), Nagai et al.

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