(57) A refrigerated drink dispenser includes a continuous carbonator with a closed carbonating
tank containing therein a carbon dioxid diffuser, an inlet for carbon dioxide to the
diffuser and an outlet for carbonated water from the carbonating tank, a closed still
water tank vertically disposed above the carbonator tank, the still water tank having
an outlet coupled to supply water by gravity to the carbonator tank, a check valve
between the still water tank and the carbonator tank to prevent backflow, a high and
low level water sensor in the still water tank, a vent outlet from the still water
tank a water supply inlet to the still water tank, with the valves for equalizing
the pressure between the carbonator tank and still water tank, valves responsive to
the high and low level sensors to: when the water level is between the upper and lower
level to open the equalizing valves and to close the vent and to close the water inlet,
when the low level is reached, to close the equalizing valve, to open the vent, and
to open the water inlet to refill the still water chamber; and to sense when the high
level is reached and to return to the condition where the equalizing valve is opened
and the vent and the supply are closed; and a spiral ice bank interposed between the
water inlet and the still water tank, the incoming water adapted to run over ice in
the ice bank to be cooled as it is supplied to the still water tank.
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