Patent ID: 7552882
Filing Date: 2009-06-30
Classification: B05B

Abstract:
1. An electrostatic-painting spray gun comprising: an atomizer provided at a forward end of the spray gun; an external charging electrode disposed at an outer portion of the spray gun so as to project ahead of the atomizer, the external charging electrode being separated from a passage through which paint is to be supplied to the atomizer, with an electric insulation of the external charging electrode being maintained; and an electrode receptacle provided at an outer portion of the spray gun, an output terminal of a high voltage generator being connected to the electrode receptacle, wherein the external electrode is freely attachable to and removable from the electrode receptacle, the electrode receptacle having a plurality of grooves formed along an outer surface of the electrode receptacle so as to define a plurality of projections, wherein the external electrode includes an electrode body formed from an insulative material, the electrode body having a charging electrode provided so as to be exposed at a forward end thereof and a plug-in portion formed at a rear end thereof, the plug-in portion having a connecting terminal arranged to electrically connect to the electrode receptacle so as to conduct electricity from the electrode receptacle to the charging electrode, the plug-in portion having a plurality of grooves formed along an outer surface of the plug-in portion so as to define a plurality of projections, the plug-in portion being attachable to the electrode receptacle by inserting the projections of the plug-in portion into respective grooves of the electrode receptacle and by inserting the projections of the electrode receptacle into respective grooves of the plug-in portion, and wherein a corrugated boundary surface formed by outer surfaces of the grooves and projections of the electrode receptacle and the plug-in portion is defined between an exposed end of the outer surface of the plug-in portion and an electrical connection formed between the connecting terminal and the electrode receptacle so as to provide a long creepage distance.