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Infant warmer open bed

  • US 5,162,038 A
  • Filed: 01/27/1992
  • Issued: 11/10/1992
  • Est. Priority Date: 12/04/1989
  • Status: Expired due to Term
First Claim
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1. An infant warmer bed comprising:

  • a base;

    an infant support surface mounted on said base;

    a heating circuit connectable to a source of electrical energy to energize a heating element connected therein;

    a heating element supported on said base and connected in said heating circuit, said element being so positioned and operable to generate heat onto said surface when electrically energized;

    means connected in said heating circuit for varying the electrical energy supplied to said element in response to a control signal;

    a control circuit having an output connected to said energy varying means for delivering said control signal thereto, said control circuit having an input for receiving a temperature signal; and

    a temperature sensing probe positionable at said support surface and attachable to the skin of an infant supported on said surface, said probe having an output connected to the input of said control circuit and operable to generate a temperature signal responsive to the temperature sensed at said probe; and

    said control circuit includingmeans for generating an intermediate signal in response to the difference between the temperature signal and a predetermined temperature setting; and

    means for generating an offset signal and for algebraically adding said offset signal and said intermediate signal so as to produce said control signal responsive to the algebraic sum of said offset signal and the difference between said temperature signal and said temperature setting; and

    said offset signal generating means including means responsive to the sign of the difference between said temperature setting and said temperature signal for periodically and cumulatively incrementing said offset signal a predetermined amount, up or down in accordance with said sign of said difference.

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