Heat control apparatus

Claim 2

Heat control apparatus for use with an electric heater, comprising proportional controller means for supplying heating current to he electric heater, temperature sensing means connected to the controller having a voltage input to said controller proportional to the temperature sensed, external circuit means connected to said temperature sensing means for applying variable voltage to the controller through said temperature sensing means, said controller receiving the sum of input voltage from both said temperature sensing means and said external circuit means, the electric heater being operated by said controller in response to the sum of the input voltages from said temperature sensing means and said external circuit means.

Claim 3

Heat control apparatus, comprising electric heater means, proportional controller means for controlling said heater means, temperature sensing means exposed to the temperature of whatever is heated by said heater means having a voltage output propottional to the temperature sensed, said temperature sensing means being connected to said proportional controller for said heater means, electrical circuit means connected to said temperature sensing means for applying voltage to said controller means through said temperature sensing means, said controller means receiving control voltage equal to the sum of the voltage output of said temperature sensing means resulting from heating and said applied voltage, said heater means being operated by said controller means in response to said sum of said voltages.

Claim 4

Heat control apparatus, comprising electric heater means, proportional controller means for controlling said heater means, temperature sensing means exposed to the temperature of whatever is heated by said heater means having a voltage output propottional to the temperature sensed, said temperature sensing means being connected to said proportional controller for said heater means, electrical circuit means connected to said temperature sensing means for applying voltage to said controller means through said temperature sensing means, said controller means receiving control voltage equal to the sum of the voltage output of said temperature sensing means resulting from heating and said applied voltage, said heater means being operated by said controller means in response to said sum of said voltages.

Claim 5

The combination of claim 2, including conductor means connecting said temperature sensing means to said controller means and including resistance means, said electrical circuit means being connected across said resistance means.

Claim 6

The combination of claim 3, said electric circuit means comprising means delivering constant direct current voltage, and variable potentiometer means for controlling said applied voltage to said controller means.

Claim 7

The combination of claim 4, including clock motor means for controlling said variable potentiometer means to substantially linearly reduce said applied voltage during a timed heating period.

Claim 8

The combination of claim 5, said temperature sensing means being a thermocouple.

Claim 9

The combination of claim 6, said applied voltage being reduced substantially linearly from a voltage substantially equal to the output voltage of said thermocouple means at the maximum temperature of heating, to zero, during the heating period, the output voltage of said thermocouple increasing substantially linearly from zero to the output voltage of said thermocouple means at said maximum temperature of heating during the heating period, whereby said controller means operates said heater means to supply heat for neating in response to reduction of said applied voltage and the increaSe in thermocouple means output voltage caused by heating maintaining the voltage supplied to said controller substantially constant.