| 摘要 |
An electrically heated hair curler or roller suitable for use in, for example, a hair setter contains therein a self-regulating heater comprised of a positive temperature coefficient (PTC) thermistor material. The PTC is in the shape of a flat pill or disc. There are no holes in the PTC, thus enabling it to maintain its integrity under stress. There are two cup shaped heat sinks, the bottoms of which rest against the flat faces of the PTC in electrical and heat conducting contact therewith. The heat sinks are held firmly against the PTC element by electrically conductive rivets or other connectors through holes in the bottoms of the heat sinks and depressions in the circumference of the PTC. A male positive electrical contact pin extends down from the inside face of the bottom of the lower heat sink. A negative electrical contact ring is around the pin and separated therefrom by a plastic insulating sleeve. The base of the contact ring has a leg through which one of the rivets fits and is in electrical contact with the rivet. The rivets are electrically insulated from the lower heat sink and the PTC thermistor. The heater is powered by electricity, which is conducted to the contact pin through a plug in a post in a hair setter stand.
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