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Heater safety control

  • US 4,068,114 A
  • Filed: 05/06/1976
  • Issued: 01/10/1978
  • Est. Priority Date: 05/06/1976
  • Status: Expired due to Term
First Claim
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1. In an apparatus having a liquid holder receptacle, fill means for delivering liquid to the receptacle from a pressurized supply, and heater means for heating liquid in the receptacle, improved control means for controlling the operation of the fill means and the heater means, comprising:

  • level sensing means for sensing the volume of liquid in said receptacle;

    timer means for controlling the fill means to provide a preselected filling of the receptacle to a preselected level above a full level and cyclically energizing said heater means;

    means responsive to said level sensing means for preventing delivery of liquid to said receptacle whenever said sensed liquid volume is above said full level; and

    switch means further responsive to said level sensing means for preventing energization of said heater means by said timer means whenever said sensed liquid volume is below a preselected minimum below said full level.

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