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Solid plate heating unit

  • US 4,394,564 A
  • Filed: 12/21/1981
  • Issued: 07/19/1983
  • Est. Priority Date: 12/21/1981
  • Status: Expired due to Fees
First Claim
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1. A plate surface heating unit having a top plate defining a heating area, said top plate having a softening temperature, temperature setting means for determining the operating temperature of said top plate including a control system for maintaining said heating area substantially at the selected cooking temperature while maintaining the temperature of said heating area below the softening temperature of said top plate comprising:

  • a metal sheathed electrical resistance heating element in intimate contact with the underside of said top plate, said element having a heating capacity capable of elevating the temperature of said top plate above its softening temperature;

    a temperature-sensing means arranged for sensing the temperature of said top plate at a plurality of selected locations in said heating area;

    cycling means in said temperature setting means operable to control energization of said heating element to maintain the temperature of said top plate at said operating temperature;

    a control means in circuit connection between said temperature sensing means and said temperature setting means for deenergizing said heating element independent of said cycling means when the temperature sensed by said temperature sensing means of said top plate and said heating element at said selected locations of said heating area reaches a selected temperature below the softening temperature of said top plate.

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