Patent ID: 7748651

Claim:
An electrostatic coating spray gun for electrifying a coating material atomized by compressed air using high voltage and coating the same onto a substance to be coated, the spray gun comprising: a barrel constituting a main body of the spray gun; an air cap mounted on a front of the barrel; a coating material delivery port which is defined in a central part of the air cap and is open outwardly; a centralized electrode protruding forward through the coating material delivery port; a first pair of projections provided at respective upper and lower positions of said air cap and formed at respective radial opposing positions of the air cap while sandwiching the centralized electrode therebetween, and said projections protruding farther forward than the coating material delivery port; a second pair of projections provided at respective left and right positions in a diametrical direction of the air cap with the centralized electrode placed therebetween, said second pair projecting forward from the coating material delivery port, wherein each of said projections has a pattern air port hole so that compressed air is spouted inwardly forward with respect to the projections; and a first pair of insulatively shielded electrodes accommodated in interiors of the respective first pair of projections and having respective surfaces covered with an electrically insulating material; a second pair of insulatively shielded electrodes having respective surfaces covered with an electrically insulating material, said second pair being accommodated, respectively, in said second pair of projections, wherein the centralized electrode is grounded and a high DC voltage is applied between the centralized electrode and the insulatively shielded electrodes so that air near a distal end of the centralized electrode is ionized and so that electrons are emitted from the centralized electrode; the insulatively shielded electrodes protrude forward; the insulatively shielded electrodes have distal ends covered by the projections located in front of the insulatively shielded electrodes, respectively; and the projections include portions other than the pattern air port holes, which portions, respectively, cover portions other than portions of the insulatively shielded electrodes opposed to the pattern air port holes.