Structure of gyrating nozzle spray gun

An improved structure of gyrating nozzle spray gun, comprising a grip, a gas delivery tube connected to said grip, and a gyrating nozzle head mounted on a front end of said gas delivery tube not touching said grip, said grip comprising an air inlet connectable to an external high-pressure air source for the intake of a compressed air, a valve seat and a trigger operable to open said valve seat for letting said compressed air flow into said gas delivery tube and said gyrating nozzle head, wherein:

• said gas delivery tube comprises a tubular mating connection screw rod located at the front end thereof;
• said gyrating nozzle head comprises a connection nut, an end cap fastened to said connection nut, a bearing mounted in said end cap and a rotator rotatably mounted in said end cap within said bearing, said connection nut comprising a through hole cut through opposing front and rear sides thereof, a screw hole axially located in the rear side thereof in communication with the said through hole of said connection nut and threaded onto said tubular mating connection screw rod of said gas delivery tube and an outer thread of said connection nut extending around a periphery of the front side, said end cap comprising an accommodation open chamber, an inner thread located in one side of said accommodation open chamber and threaded onto said outer thread of said connection nut, an outer chamber located in an opposite side of said accommodation open chamber and an opening surrounded by an inside wall of said outer chamber, said rotator being accommodated in said accommodation open chamber of said end cap and comprising a rotator head, said rotator head defining a front wall and being inserted into the said opening of said end cap, a gas accumulation chamber defined in said rotator head, an oblique jet hole eccentrically and obliquely relative to said through hole located at the said front wall of said rotator head and disposed in communication with said gas accumulation chamber, a rim radially extended around a periphery of one end of said rotator head not touching said front wall and a stop flange located at one side of said rim and extended around and abutted to a periphery of said rotator head and stopped at one side of said bearing, said rim defining with said rotator head a restricted space in said outer chamber of said end cap, said bearing being mounted in said restricted space in said end cap around said rotator head of said rotator and stopped with one side edge thereof against said stop flange of said rotator and an opposite side edge thereof against an inner end edge of said opening of said end cap, said bearing comprising an outer race abuttedly fitted into an inner peripheral wall of said outer chamber in said accommodation open chamber of said end cap and an inner race mounted on said rotator head of said rotator and rotatable with said rotator relative to said outer race;
• the compressed air flow is ejected out of said oblique jet hole toward said opening of said end cap.