Dual temperature hair curler utilizing a pair of PTC heaters

Details Dual temperature hair curler utilizing a pair of PTC heaters Dual temperature hair curler utilizing a pair of PTC heaters

1987-04-06

1989-06-20

Bartis, Anthony

Electric heating

Heating devices

Tool or instrument

132232, 219230, 219241, 219505, 219534, 219544, 338 22R, H05B 102, H05B 324, H01C 702, A45D 104

Patent

active

048411272

ABSTRACT:
A dual temperature hair curler has a hollow heat transmitting metallic barrel enclosing a pair of PTC heaters connected in series to each other and electrically insulated from the barrel by an oxide-filled silicone rubber material. The PTC heaters have different anomaly temperatures and a switch arrangement is provided for (1) energizing the higher anomaly temperature heater a series with the lower anomaly temperature heater to produce a low temperature limited by the anomaly temperature of the lower temperature heater and (2) effectively energizing only the higher anomaly temperature heater to produce a high temperature limited by the anomaly temperature of the higher temperature of the higher temperature heater by bypassing the lower anomaly temperature heater.

REFERENCES:
patent: 2507736 (1950-05-01), Ritchie et al.
patent: 3400250 (1968-09-01), Buiting et al.
patent: 3953711 (1976-04-01), Eck et al.
patent: 4147927 (1979-04-01), Pirotte
patent: 4151401 (1979-04-01), Van Bokestal et al.
patent: 4267430 (1981-05-01), Downey
patent: 4365140 (1982-12-01), Bast et al.
patent: 4493972 (1985-01-01), Steimel et al.
patent: 4673798 (1987-06-01), Comtri et al.

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