| 摘要 |
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.
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