Dual temperature electric curling iron having a safety shut-off

Details Dual temperature electric curling iron having a safety shut-off Dual temperature electric curling iron having a safety shut-off

1986-04-02

1987-06-16

Bartis, Anthony

Electric heating

Heating devices

Tool or instrument

132 9, 132 11R, 132 37R, 219230, 219240, 219241, 219248, 219250, 219251, 219255, 219506, 219508, H05B 102, A45D 104

Patent

active

046737987

ABSTRACT:
A dual temperature curling iron has a plastic handle and a metal barrel connected thereto. An electric heater positioned within the metal barrel and is arranged to rapidly heat the barrel and is selectively controlled by either a low temperature thermostat or a high temperature thermostat located within the barrel to provide heat to the metal barrel. A hair clamp is pivotally mounted on the metal barrel, and when opened, causes a switch to generate an in-use signal which is fed to a safety timing circuit. The timing circuit is reset each time it receives the in-use signal. In the event that no further in-use signals are received, the timing circuit, after a preselected interval, provides a signal to a silicon controlled rectifier which is connected to the electric heater causing the silicon controlled rectifier to interrupt electric power to the electric heater. The curling iron is provided with a visual signal for indicating that has reached the selected temperature and is ready for use.

REFERENCES:
patent: 2343654 (1944-03-01), Finlayson
patent: 2382587 (1945-08-01), Thomas
patent: 2648757 (1953-08-01), Harper
patent: 4203101 (1980-05-01), Towsend
patent: 4243875 (1981-01-01), Chang
patent: 4365140 (1982-12-01), Bast et al.
patent: 4418268 (1983-11-01), Munshaw
patent: 4520257 (1985-05-01), Schwob et al.

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