Beer dispenser

Claim 1

A BEER DISPENSER OF THE TYPE INTENDED FOR THE DISPENSING OF ACCURATELY MEASURED QUANTITIES OF BEER AND DEPOSITING THE BEER IN SERVING GLASSES UNDER CONDITIONS OF CONTROLLED TURBULENCE TO CONTROL FOAMING, COMPRISING: A MEASURING CYLINDER HAVING A SUBSTANTIAL TOP AND BASE AND AN INTERMEDIATE CYLINDER WALL OF SHEET MATERIAL; A PISTON DISPOSED FOR RECIPROCATION IN SAID CYLINDER AND HAVING A COAXIAL PISTION STEM TUBE AND BYPASS VALVE; FLUID OPERATED DIAPHRAGM MEANS MOUNTED UPON SAID PISTON STEM TUBE FOR SEQUENTIAL CONTROL OF SAID BYPASS VALVE AND A COAXIALLY POSITIONED VALVE STEM OPERATIVELY CONNECTING SAID DIAPHRAGM MEANS AND SAID BYPASS VALVE; CHECK VALVE DISC SECURED ON SAID PISTON STEM AND DISPOSED FOR RECIPROCATION WITH SAID PISTON AND HAVING A SEPARATE TOP PLATE REMOVABLY SECURED THERETO; A PISTON RETURN FLUID OPERATED BELLOWS DISPOSED AROUND SAID PISTON STEM, SECURED AT ITS BOTTOM TO THE TOP OF SAID CYLINDER AND AT ITS UPPER END BETWEEN SAID VALVE DISC; AN ANNULAR PASSAGEWAY FOR BEER DISPOSED SPIRALLY AROUND SAID MEASURING CYLINDER AND UTILIZING THE SHEET MATERIAL CYLINDER OF SAID MEASURING CYLINDER AS THE INNER WALL OF SAID PASSAGEWAY AND MEANS FOR VARYING THE USABLE LENGTH THEREOF; COOLING MEANS FOR CONTROLLING THE TEMPERATURE OF BEER LEFT IN SAID CYLINDER AND SAID PASSAGEWAY BETWEEN DISPENSING PERIODS; A BEER DISCHARGE NOZZLE AND A FLUID ACTUATED OUTLET VALVE THEREFOR; A DISPENSING CYCLE COUNTER AND MEANS CONNECTED TO SAID PISTON DISPOSED TO OPERATE SAID COUNTER EACH TIME A SERVING OF BEER IS DRAWN; A SOURCE OF GAS UNDER PRESSURE TO OPERATE SAID FLUID PRESSURE OPERATED MEANS; A CHARGING VALVE MEANS CONTROLLING THE DISTRIBUTION OF SAID GAS UNDER PRESSURE.