Tank heater alarm
OwnerVeral L. McGrawinventor
Life of this patent
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Abstract
A housing containing a buzzer and mercury switch is mounted on the shaft of the drain lever for a heated tank, for example in a dishwasher. If the heating unit is still turned on when the drain valve is opened, the buzzer sounds to warn the operator that operation of the heating unit without water in the tank will damage the machine.
Claims4
In an appliance having a tank, an electrically controlled heating unit to heat liquid in said tank, and a tank drain valve, the improvement comprising an alarm circuit energized from a circuit which is energized to operate said heating unit, and a control switch for actuating an alarm in said alarm circuit which is closed by the opening of said drain valve.
Dependencies are inferred from the claim text.