Electrically heated hot-air dispenser

Claim 1

A hot-air dispenser, comprising: an elongated hollow handle having means defining an air flow passage therethrough; means for connecting an air-supply tube to said airflow passage at one end of said handle and an electric cable to said one end of said handle whereby relatively cool air traverses the interior of said handle; a heating unit affixed to the other end of said handle and including an outer cylindrical tube, a central cylindrical tube coaxially received in said outer cylindrical tube with a clearance communicating with the interior of said handle airfloW passage at the end proximal said handle and receiving air therefrom, the end of the clearance remote from the handle being closed, and an inner cylindrical tube coaxially received in said central cylindrical tube with a second clearance closed at the end proximal the handle and communicating with the first-mentioned clearance remote from said handle, the interior of said inner tube communicating with said second clearance proximal to said handle; a resistive heating element received in said inner tube and defining therewith a heating chamber traversable by air; nozzle means secured to said heating unit remote from said handle and communicating with said chamber of said inner tube; and temperature control means including circuit means received in the airflow passage of said handle, exposed to the flow of cooling air therethrough, and connected to said resistor heating element for controlling the current flow therethrough, and a temperature-responsive element positioned immediately ahead of said nozzle means and exposed to air traversing said chamber and connected to said circuit means.