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Method and device for detecting the presence of a body, for example a saucepan, on a glass ceramic cooking hob in correspondence with a heating element associated with said hob

  • US 5,424,512 A
  • Filed: 01/28/1993
  • Issued: 06/13/1995
  • Est. Priority Date: 01/28/1992
  • Status: Expired due to Term
First Claim
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1. A device for detecting the presence of a food container on a glass ceramic cooking hob within a cooking zone on a hob plate of said glass ceramic cooking hob, below said hob plate there being provided at least one heating element in correspondence with said cooking zone, said device comprising conductive means positioned between the hob plate and the corresponding heating element, said conductive means being at least of open loop configuration and being connected to control means for controlling the operation of at least said heating element, a physical characteristic of said conductive means varying following the positioning of the container on the hob plate in correspondence with said heating element, said variation corresponding to a variation in a corresponding electrical signal passing through said means, this variation being measured by the control means, which consequently act to control the heating element to modify its operating parameters,said conductive means comprising an electrical resistor associated with a support for the heating element and positioned above the heating element,said electrical resistor of filiform type and associated with a plurality of supports, at least one of which is elastically movable relative to a reflecting element which also acts as the support for the heating element.

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