Electric heating – Heating devices – Tool or instrument
Patent
1980-05-19
1982-10-12
Bartis, A.
Electric heating
Heating devices
Tool or instrument
132 11R, 132 31R, 132 37R, 219241, 219242, 219533, H05B 102, A45D 104, A45D 236
Patent
active
043540937
ABSTRACT:
An electrically heated hair curling instrument, such as a curling iron, includes heating element having an outer tube enclosing a thermistor located between a pair of longitudinally spaced electric heating coils and arranged in contact with the tube interior surface. The heating element is detachably connected to the end of a handle assembly by mating electrical connectors. An electric cord connects the heating coils and thermistor through the mating connectors and a rotatable mandrel and slip rings in the handle assembly to a temperature control box mounted in a stand having means for supporting the curling instrument when not in use. A manually-adjustable temperature control circuit located in the control box and responsive to the temperature of the heating element as measured by the thermistor controls energization of the curling instrument, depending on the type of hair being curled. The stand and control box can be arranged to accomodate and control two curling instruments of different size.
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