×

Control circuit arrangement for a portable electrically heated hair treatment appliance

  • US 4,085,309 A
  • Filed: 06/04/1975
  • Issued: 04/18/1978
  • Est. Priority Date: 06/04/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. An improved heater control for an electrical appliance comprising,a. an appliance casing having an air inlet and an air outlet,b. means positioned in said casing for establishing an airstream from said inlet through said casing to said outlet,c. an electrical resistance heater positioned within the casing in said airstream,d. means including a switch means for applying an alternating potential to energize said heater to heat the airstream to an operating temperature T1,e. means within the airstream for sensing the heat of the airstream and electrically connected in series circuit with said switch means, said sensing means being operable to automatically open said series circuit to interrupt said alternating potential energization of the heater when said operating temperature exceeds a safe limit temperature T2 which is greater than temperature T1, andf. half-wave rectifier means electrically connected across said sensing means for applying half-cycles of the applied alternating potential to the heater during said open circuit condition of the series circuit.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×