Device for regulating the level of a liquid in a boiler of a coffee machine
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United States of America Patent
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May 19, 2015
Grant Date -
Dec 30, 2010
app pub date -
Oct 16, 2007
filing date -
Oct 20, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a device to regulate the level of a liquid inside a boiler of a coffee machine, having a transparent duct connected to the boiler and designed to visibly display the level of the liquid inside the boiler, a capacitive sensor that can be positioned outside the transparent duct in determined positions and designed to generate electric signals representing the presence or absence of liquid in correspondence to the position of the sensor along the transparent duct. The sensor of the device has first measuring elements and second measuring elements, both of capacitive type; the second measuring elements are positioned at a predetermined distance from the first measuring elements, and a measuring device designed to measure the impedance between the first and second measuring elements and to generate signals indicating the presence or absence of liquid in correspondence to the position of the sensor. The invention also relates to the machine that includes this device.
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