Automatic milk boiling appliance - uses overflow vessel and counterbalanced lever to open and close electric contacts when heated vessel is empty or full

摘要

The milk bottling appliance uses two vessels, a taller one with a large spout which directs boiling milk into the second, lower, vessel placed with its edge beneath the overhang of the spout of the taller vessel. The taller vessel (1) is placed on a horizontal electric heating plate (5) which has a vertical rod (8) passing through it. The rod acts against a counterweight (10) lever (9) so that when the vessel is empty the counterweight holds the lever horizontal against a stop on the rod, and when the vessel (1) is filled the weight of fluid overcomes the counterweight (10) and the lever (9) falls, closing a spring contact (11) which closes the electric circuit to the heating element. Once the milk has boiled over into the second vessel the reduced weight of the heating vessel allows the lever (9) to rise and the spring contact opens (11) the electric circuit.