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A fixedly positioned hot plate, particularly for use with a coffee maker, has an upper surface for receiving a container of liquid to be maintained at a constant temperature. An electric heating device arranged underneath the hot plate includes a plate member movable between a first position in bias

A fixedly positioned hot plate, particularly for use with a coffee maker, has an upper surface for receiving a container of liquid to be maintained at a constant temperature. An electric heating device arranged underneath the hot plate includes a plate member movable between a first position in biased engagement with the underside of the hot plate and a second position spaced therefrom to vary the heat exchange rate therebetween. Secured to the underside of the plate member is a metallic sheathed heating having a water heating pipe soldered to the periphery thereof. A temperature sensitive element, e.g. U-shaped bimetal, thermally coupled to the heating device has a first portion connected to a downwardly dependent stud secured to the underside of the hot plate and extending freely through a bore in the plate member an a second portion secured to the plate member. The temperature sensitive element is arranged to move the plate member toward and away from the hot plate in response to the temperature of the heating device to maintain the temperature of the liquid in the container at constant optimal value independent of the amount of liquid in the container.

대표청구항 ▼

In an electrical appliance, particularly an electric coffee maker, a fixedly positioned hot plate structure having an upper surface for receiving an article to be heated, an electric heating device arranged underneath said hot plate structure in heat exchange relationship therewith. stud structure s

In an electrical appliance, particularly an electric coffee maker, a fixedly positioned hot plate structure having an upper surface for receiving an article to be heated, an electric heating device arranged underneath said hot plate structure in heat exchange relationship therewith. stud structure secured to the underside of said hot plate structure and extending downwardly therefrom, said heating device including a plate member movable between a first position in engagement with the underside of said hot plate structure and a second position spaced from said hot plate structure to vary the heat exchange rate therebetween, said plate member having an aperture through which said stud structure freely extends, and a temperature-sensitive element thermally coupled to said heating device and adapted to deform as a function of its temperature, said temperature-sensitive element having first contact means connecting a first portion of said temperature-sensitive element to said stud structure, and second contact means connecting a second portion of said temperature-sensitive element to said plate member of said heating device, said second portion having a bore through which said stud structure freely extends, said temperature sensitive element being arranged to move said plate member toward and away from said hot plate structure.