Patent ID: 7946510

Claim:
A spray gun comprising: a hollow cylindrical part located at a front end of the spray gun and having an open end in a front end thereof; a nozzle assembly comprising a nozzle connected to the open end of the hollow cylindrical part and a piston rod movably inserted into the nozzle; an air cap having a central passage, multiple angular passages and multiple air passages, the multiple angular passages and the multiple air passages located symmetrically on a front face of the air cap respectively, and a back board located at a back face of the air cap and having an air outlet portion which includes a central hole and multiple outlets which are independent from the central hole, the back board including multiple positioning studs extending from a back face thereof and multiple resilient members located on the back face of the back board and mounted to the positioning studs so as to push the back board to contact the air cap, the spray gun including multiple reception holes in which the positioning studs are inserted.