Structure of gyrating nozzle spray gun

Abstract

An improved structure of gyrating nozzle spray gun includes a grip including an air inlet and a trigger-controlled valve seat, an attachment tube connected to the valve seat, and a gyrating nozzle head including a connection nut threaded onto a front tubular mating connection screw rod of the attachment tube, an end cap threaded onto outer thread of the connection nut, a bearing positioned in the end cap, and a rotator supported on the connection nut and inserted through the bearing into a front opening of the end cap and rotatable with an inner race of the bearing and defining therein a plenum chamber for receiving compressed air from the valve seat via the attachment tube and the connection nut and an oblique jet hole eccentrically located in a front side thereof for ejecting compressed air and causing the rotator to rotate during ejection of compressed air.

What the invention claimed is: 
     
         1 . An improved structure of gyrating nozzle spray gun, comprising a grip, an attachment tube connected to said grip, and a gyrating nozzle head mounted on a front end of said attachment tube remote from said grip, said grip comprising an air inlet connectable to an external high-pressure air source for the intake of compressed air, a valve seat and a trigger operable to open said valve seat for letting said compressed air flow into said attachment tube and said gyrating nozzle head, wherein:
 said attachment tube comprises a tubular mating connection screw rod located at the front end thereof;   said gyrating nozzle head comprises a connection nut, said connection nut comprising a through hole extending through opposing front and rear sides thereof, a screw hole located in said rear side and threaded onto said tubular mating connection screw rod of said attachment tube, an outer thread extending around the periphery of the front side thereof, an end cap, said end cap comprising an accommodation open chamber, an inner thread located in a rear side of said accommodation open chamber and threaded onto said outer thread of said connection nut and an opening located in an opposing front side of said accommodation open chamber, a bearing positioned in said accommodation open chamber of said end cap, and a rotator mounted in said bearing inside said accommodation open chamber and rotatable relative to said end cap and said attachment tube, said rotator comprising a plenum chamber disposed in communication with the through hole of said connection nut for receiving said compressed air flow and an oblique jet hole obliquely located in a front side thereof in communication with said plenum chamber for ejecting said compressed air flow out of said rotator and said end cap.   
     
     
         2 . The improved structure of gyrating nozzle spray gun as claimed in  claim 1 , wherein said rotator inserted into said opening of said end cap comprises a radial stop flange formed around the plenum chamber, and a circular peripheral stop wall located on the front surface of the radial stop flange; said bearing is stopped at the radial stop flange of the rotator thereof abutted against the circular peripheral stop wall of the rotator. 
     
     
         3 . The improved structure of gyrating nozzle spray gun as claimed in  claim 1 , further comprising a gasket ring mounted on said tubular mating connection screw rod of said attachment tube and sealed between said attachment tube and said connection nut of said gyrating nozzle head. 
     
     
         4 . The improved structure of gyrating nozzle spray gun as claimed in  claim 1 , wherein said bearing is tightly press-fitted into said accommodation open chamber of said end cap of said gyrating nozzle head, comprising a rotatable inner race attached to said rotator for rotation with said rotator relative to said end cap and said attachment tube; said rotator inserted into said opening of said end cap comprises a radial stop flange formed around the plenum chamber, and a circular peripheral stop wall located on the front surface of the radial stop flange; said bearing is stopped at the radial stop flange of the rotator thereof abutted against the circular peripheral stop wall of the rotator. 
     
     
         5 . The improved structure of gyrating nozzle spray gun as claimed in  claim 1 , wherein said oblique jet hole of said rotator of said gyrating nozzle head is disposed at an eccentric location in communication with said plenum chamber. 
     
     
         6 . The improved structure of gyrating nozzle spray gun as claimed in  claim 1 , wherein said rotator further comprises a through hole located in the front side thereof; said attachment tube is a T-shaped three-way tube, comprising a bottom connection tube located at a bottom side thereof and mounted with a water tank, a dip tube connected to said bottom connection tube and inserted into said water tank for sucking a fluid from said water tank into said bottom connection tube, a water-supply tube connected to said bottom connection tube in communication with said dip tube and inserted into said gas-delivery hole of said attachment tube, the through hole of said connection nut and said plenum chamber of said rotator and terminating in a water outlet tip, said water outlet tip of said water-supply tube being inserted into the through hole in the front side of said rotator near said oblique jet hole. 
     
     
         7 . The improved structure of gyrating nozzle spray gun as claimed in  claim 6 , wherein the through hole of said rotator is located at one lateral side of said oblique jet hole and disposed in communication with said plenum chamber; said oblique jet hole of said is obliquely located at an eccentric location in the front side of said rotator. 
     
     
         8 . The improved structure of gyrating nozzle spray gun as claimed in  claim 6 , wherein the diameter of the through hole of said rotator is larger than the outer diameter of said water outlet tip so that an annular gap is defined in the through hole of said rotator around said water outlet tip for the passing of said compressed air flow.