Spray gun

Claim 1

IN A SPRAY GUN HAVING A CONTAINER FOR A LIQUID CHEMICAL AND A HOLLOW HOUSING SECURED TO THE CONTAINER, THE HOUSING HAVING AN INLET PORT ADAPTED FOR CONNECTION TO A SUPPLY OF A CARRIER FLUID TO BE MIXED WITH THE CHEMICAL, AND HAVING AN OUTLET PORT THROUGH WHICH THE MIXED CHEMICAL AND CARRIER FLUID IS SPRAYED, THE IMPROVEMENT COMPRISING: A MANIFOLD MOUNTED IN THE HOLLOW HOUSING TO BE MOVABLE FROM A FIRST TO A SECOND POSITION, THE MANIFOLD HAVING A FIRST SPRAY DUCT AND A FILLING DUCT THERETHROUGH, THE FIRST SPRAY DUCT HAVING AN INLET ALIGNED WITH THE INLET PORT AND AN OUTLET ALIGNED WITH THE OUTLET PORT WHEN THE MANIFOLD IS IN THE FIRST POSITION THE FILLING DUCT HAVING AN INLET ALIGNED WITH THE INLET PORT WHEN THE MANIFOLD IS IN THE SECOND POSITION, THE MANIFOLD HAVING A SUCTION PASSAGE AND A FILLING PORT WHICH OPEN INTO THE SPRAY DUCT ADJACENT THE SPRAY DUCT OUTLET; A METERING JET MOUNTED IN THE SPRAY DUCT ADJACENT THE SPRAY DUCT OUTLET AND HAVING A FIRST TRANSVERSE PASSAGE IN ALIGNMENT WITH THE MANIFOLD FILLING PORT AND A SECOND TRANSVERSE PASSAGE IN ALIGNMENT WITH THE SUCTION PASSAGE; MEANS DEFINING A CHANNEL BETWEEN AN OUTLET OF THE SECOND DUCT AND THE FILLING PORT; AND MEANS FOR SEALING THE FILLING PORT WHEN THE MANIFOLD IS IN THE FIRST POSITION; WHEREBY CARRIER FLUID FLOWS LONGITUDINALLY THROUGH THE JET TO MIX WITH AND ASPIRATE LIQUID CHEMICAL THROUGH THE SUCTION PASSAGE WHEN THE MANIFOLD IS IN THE FIRST POSITION, AND CARRIER FLUID FLOWS TRANSVERSELY THROUGH THE JET INTO THE SUCTION PASSAGE WHEN THE MANIFOLD IS IN THE SECOND POSITION.