Air operated spray device having flexible packing means

Claim 1

IN A SPRAY DEVICE OF THE CLASS DESCRIBED, A SPRAY GUN BODY HAVING A SPRAY NOZZLE AT THE FORWARD END THEREOF, A LIQUID CHAMBER IN THE FORWARD PORTION OF SAID GUN BODY IN COMMUNICATION WITH SAID NOZZLE, A COMPRESSED AIR CHAMBER IN SAID BODY ALSO IN COMMUNICATION WITH SAID NOZZLE BUT HAVING A REARWARDLY DISPOSED PORTION, A LIQUID DISCHARGE ORIFICE AND AIR DISCHARGE ORIFICES IN SAID NOZZLE, AN ELONGATED CYLINDRICAL NEEDLE VALVE HAVING A FORWARD END CONTROLLING FLOW THROUGH SAID LIQUID ORIFICE, A BORE IN THE BODY OF SAID GUN BETWEEN SAID LIQUID CHAMBER AND THE REARWARD PORTION OF SAID AIR CHAMBER THROUGH WHICH AN INTERMEDIATE PORTION OF SAID NEEDLE VALVE SNUGLY PASSES, A MOTOR CHAMBER WITHIN SAID GUN BODY COMMUNICATION WITH THE COMPRESSED AIR SUPPLY, AND A MOTOR ELEMENT IN SID MOTOR CHAMBER ADAPTED TO BE SUBJECTED TO THE PRESSURE OF THE COMPRESSED AIR, MEANS CONNECTING THE REAR END PORTION OF SAID NEEDLE VALVE WITH SAID MOTOR ELEMENT WHEREBY MOVEMENT OF SAID MOTOR ELEMENT UNDER THE PRESSURE OF THE COMPRESSED AIR EFFECTS LONGITUDINALLY MOVEMENT OF SAID NEEDLE VALVE TO OPEN THE LIQUID ORIFICE OF SAID NOZZLE, AND PACKING MEANS FOR THE NEEDLE VALVE SUPPLEMENTING THE CLOSE FIT OF THE VALVE IN SAID BORE WHICH COMPRISES A TUBULAR FLEXIBLE MEMBER