초록 ▼

A coffee brewing machine utilizes an insulated carafe to receive the brewed coffee and automatically turns itself off a short time after completion of a brew cycle. The machine also turns off automatically a specified time after a brew cycle is initiated when calcification is so extreme that flow of

A coffee brewing machine utilizes an insulated carafe to receive the brewed coffee and automatically turns itself off a short time after completion of a brew cycle. The machine also turns off automatically a specified time after a brew cycle is initiated when calcification is so extreme that flow of water through the unit is totally prevented. Additionally, as a safety feature, the system also turns off automatically in the case of a “dry run”, that is, a short specified time after accidental energization when no water is in the reservoir. A lamp is lighted when a brew cycle is in progress but is extinguished at other times.

대표청구항 ▼

A coffee brewing machine comprising: a water reservoir of finite capacity; a brewing station; a water supply conduit in communication with and extending between said reservoir and said brewing station; a first electrically energizable heat generator intermediate said water reservoir and said brewing

A coffee brewing machine comprising: a water reservoir of finite capacity; a brewing station; a water supply conduit in communication with and extending between said reservoir and said brewing station; a first electrically energizable heat generator intermediate said water reservoir and said brewing station for heating water in said water supply conduit to a sufficient extent as it flows from said reservoir to said brewing station to enable coffee to be brewed at said brewing station, said reservoir being substantially depleted of water at the end of a normal complete brew cycle; first and second temperature sensitive switches electrically in series with said first heat generator, said first switch being biased to a closed position and responsive to the temperature at said first heat generator and automatically movable to an open position when the temperature at said first heat generator exceeds a predetermined magnitude and automatically returning to a closed position when the temperature at said first heat generator falls below said predetermined magnitude by reason of the cooling effect of the continued flow of water through said supply conduit; and a second heat generator associated with said second switch electrically in parallel with said first switch and operable to generate heat upon opening of said first switch, said second switch being responsive to operation of said second heat generator to open if, after a predetermined lapse of time, said first switch is also open, a condition indicative of the absence of the flow of water through said supply conduit.