Filler for charging containers

Claim 1

IN A FILLER UNIT FOR A CONTAINER FILLING MACHINE COMPRISING, A SUPPLY TANK, A FIXED CYLINDER SEALINGLY MOUNTED IN AN APERTURE IN THE BOTTOM OF SAID SUPPLY TANK, A DISPLACEMENT CYLINDER ADAPTED TO TELESCOPE WITHIN SAID FIXED CYLINDER AND TO TRAP FLUID WITHIN SAID CYLINDERS, AN OPERATING SLEEVE HAVING A LATERAL ENLARGEMENT INTERMEDIATE THE ENDS THEREOF, SAID OPERATING SLEEVE BEING SLIDABLY MOUNTED WITHIN SAID CYLINDERS FOR UPWARD AND DOWNWARD MOVEMENT THEREIN, MEANS FOR MOVING SAID OPERATING SLEEVE UPWARDLY AND DOWNWARDLY WITHIN SAID CYLINDERS, UPWARD MOVEMENT OF SAID OPERATING SLEEVE LIFTING SAID DISPLACEMENT CYLINDER THROUGH ENGAGEMENT OF THE SAME BY SAID LATERAL ENLARGEMENT, MEANS FOR EFFECTING DOWNWARD MOVEMENT OF SAID DISPLACEMENT CYLINDER UPON DOWNWARD MOVEMENT OF SAID OPERATING SLEEVE, AND A DISPENSING VALVE AT THE LOWER END OF SAID OPERATING SLEEVE, MEANS DEFINING COMMUNICATION BETWEEN THE INTERIOR OF SAID OPERATING SLEEVE AND SAID CYLINDERS, MEANS DEFINING AT LEAST ONE METERING VENT IN THAT PORTION OF SAID OPERATING SLEEVE OUTSIDE SAID CYLINDERS BUT WITHIN SAID SUPPLY TANK, THE IMPROVEMENT IN SAID FILLER UNIT COMPRISING: AN AIR EXHAUST