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AssigneeU.S. Philips Corporation
InventorsJohan Pragt, Ronald Wijnsema
Estimating the term…
Apparatus (1a, 1b) for heating liquids has a receptacle (10)for receiving liquid to be heated, a heating element (30) in the form of a support (31) having an electrically insulating surface (32b) carrying a resistive track (33) for heating liquid within the receptacle (10) and a control arrangement (40) for controlling the supply of power to the heating element (30). The control arrangement (40) includes a detector (41) for detecting deflection of the heating element (30). during operation of the apparatus and for reducing the power supply to the heating element (30) when the deflection of the heating element (30) exceeds a predetermined amount so providing a simple, efficient way of switching off the apparatus if the heating element (30) overhears due to, for example, the apparatus being boiled dry or the vessel (2a, 2b) being tilted to expose the heating element out of the liquid being heated.
An apparatus for heating liquids comprising a receptacle for receiving liquid to be heated, a heating element comprising a support having an electrically insulating surface carrying a resistive track for heating liquid within the receptacle, differences in temperature between surfaces of the heating element causing deflection of said heating element during operation of the apparatus, and a control arrangement for controlling the supply of power to the heating element, which control arrangement comprises means for detecting deflection of the heating element during operation of the apparatus and for reducing the power supply to the heating element when the deflection of the heating element exceeds a predetermined amount.
An apparatus for heating liquids comprising a receptacle for receiving liquid to be heated, a heating element comprising a support having an electrically insulating surface carrying a resistive track for heating liquid within the receptacle, an increase in differences in temperature between surfaces of the heating element causing deflection of said heating element during operation of the apparatus, and a control arrangement for controlling the supply of power to the heating element, which control arrangement comprises means for detecting deflection of the heating element during operation of the apparatus and for reducing the power supply to the heating element when the deflection of the heating element exceeds a predetermined amount responsive to said heating element not being in contact with liquid being heated.
An apparatus for heating liquids comprising a receptacle for receiving liquid to be heated, a heating element comprising a support having an electrically insulating surface carrying a resistive track for heating liquid within the receptacle, differences in temperature between surfaces of the heating element causing deflection of said heating element during operation of the apparatus, and a control arrangement for controlling the supply of power to the heating element, which control arrangement comprises means for detecting deflection of the heating element during operation of the apparatus and for reducing the power supply to the heating element when the deflection of the heating element exceeds a predetermined amount responsive to the absence of liquid in the receptacle.
An apparatus for heating liquids comprising a receptacle for receiving liquid to be heated, a heating element comprising a support having an electrically insulating surface carrying a resistive track for heating liquid within the receptacle, an increase in differences in temperature between surfaces of the heating element causing deflection of said heating element during operation of the apparatus, and a control arrangement for controlling the supply of power to the heating element, which control arrangement comprises means for detecting deflection of the heating element during operation of the apparatus and for reducing the power supply to the heating element when the deflection of the heating element exceeds a predetermined amount responsive to liquid in the receptacle being tilted.
Dependencies are inferred from the claim text.