Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1986-09-24
1988-10-11
Bartis, Anthony
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
128403, 219201, 219327, 219496, 219509, 338114, 383901, H05B 102, H05B 354, A61F 704, H01C 1010
Patent
active
047773464
ABSTRACT:
A liquid or gel filled pillow utilized for therapeutic purposes is formed from a pair of flexible casing of plastic or the like, one within the other, and being separated by a compressible electrically conductive foam material having a high resistance in its uncompressed slate and a low resistance when compressed. The facing surfaces of the casings are coated with a layer of highly conductive material in electrical contact with the foam. The inner casing is provided with a thermostatically controlled heating element for heating the liquid or gel contained therein. One terminal of the heating element is connected to the power supply through the conductive layers foam so that upon compression of the foam, as would be occasioned by a patient laying his head upon the pillow, there will result an electric current flow to the heating element due to the lowered electrical resistance of the foam. Upon removal of the compressive force to the pillow, the foam reverts to its high resistance uncompressed state thereby automatically terminating electric current flow to the heating element.
REFERENCES:
patent: 2072564 (1937-03-01), May
patent: 2114396 (1938-04-01), McFarlan et al.
patent: 2223154 (1940-11-01), Thornton-Norris
patent: 2294010 (1942-08-01), Van Daam
patent: 2445660 (1948-07-01), Bruestle
patent: 3014117 (1961-12-01), Madding
patent: 3386067 (1968-05-01), Costamzo
patent: 3885403 (1975-05-01), Spencer
patent: 4201218 (1980-05-01), Feldman et al.
patent: 4204110 (1980-05-01), Smit et al.
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