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ELECTRIC BLANKETS

  • US 3,591,765 A
  • Filed: 05/19/1969
  • Issued: 07/06/1971
  • Est. Priority Date: 06/17/1968
  • Status: Expired due to Term
First Claim
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1. An electric blanket including a circuit comprising two heater elements, a transformer having a primary winding and a secondary winding, a pair of terminal across which a source of electric power can be connected, first switch means having a first condition in which said elements are connected across said terminals and a second condition in which said elements are connected across the secondary winding of the transformer and the primary winding is connected across said terminals, and second switch means which acts as a temperature control, the circuit being such that the root mean square current in the second switch means is the same whether the first switch means is in the first or the second condition.

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