Pressure reducing blow gun

Claim 1

IN A PRESSURE REDUCING BLOW GUN INCLUDING AN INLET FOR COMPRESSED GAS AND A VALVE FOR CONTROLLING THE ENTRY OF COMPRESSED GAS FROM SAID INLET TO THE GUN, OUTLET MEANS FOR DISCHARGE OF COMPRESSED GAS FROM THE GUN COMPRISING: A TUBE HAVING AN INNER END AND AN OUTER END PROVIDED WITH A DISCHARGE OPENING THERETHROUGH FOR DISCHARGE OF COMPRESSED GAS FROM THE GUN; A NOZZLE MOUNTED WITHIN THE INNER END OF SAID TUBE EXTENDING A DISTANCE AXIALLY THEREINTO AND BEING PROVIDED AT ITS INNER END WITH A DISCHARGE ORIFICE FOR DISCHARGE OF COMPRESSED GAS THERETHROUGH INTO SAID TUBE; SAID NOZZLE BEING FORMED AND MOUNTED TO RECEIVE COMPRESSED GAS FROM SAID VALVE FOR DISCHARGE THROUGH SAID ORIFICE AND BEING SHAPED TO FORM IN COMBINATION WITH SAID TUBE A VENTURI THEREAROUND WITHIN SAID TUBE; SAID TUBE BEING PROVIDED WITH A FIRST SET OF PERFORATIONS THERETHROUGH SPACED APART THEREAROUND AND SPACED APART LONGITUDINALLY THEREALONG IN THE REGION OF AND AROUND SAID VENTURI FOR ASPIRATION OF AIR THERETHROUGH INTO SAID TUBE BY THE ACTION OF SAID VENTURI; SAID NOZZLE BEING MOUNTED WITH SAID DISCHARGE ORIFICE THEREOF LOCATED WITHIN THAT PORTION OF THE INTERIOR OF SAID TUBE SURROUNDED BY SAID FIRST SET OF PERFORATIONS; SAID TUBE BEING PROVIDED WITH A SECOND SET OF PERFORATIONS INDEPENDENT OF SAID FIRST SET OF PERFORATIONS AND BEING LOCATED ADJACENT SAID DISCHARGE IN THE OUTER END OF SAID TUBE; AND SAID SECOND SET OF PERFORATIONS BEING SPACED A DISTANCE LONGITUDINALLY ALONG SAID TUBE REMOTE FROM AND INDEPENDENT OF SAID FIRST SET OF PERFORATIONS FOR ASPIRATION OF AIR INTO SAID TUBE ADJACENT THE DISCHARGE END OF THE LATTER BY THE FLOW OF COMPRESSED GAS THROUGH SAID TUBE AND FOR PRESSURE RELEASING REVERSE FLOW OF COMPRESSED GAS OUTWARDLY THERETHROUGH UPON BLOCKING OF SAID DISCHARGE FROM SAID TUBE.