Patent ID: 6758425
Filing Date: 2004-07-06
Classification: B05B

Abstract:
A coating-powder spray gun, comprising:at least one high-voltage electrode (32) for electrostatically charging coating powder; a powder tube (38) made of electrically insulating material, positioned at an intake side of the spray gun, and having a rear terminal segment; a hookup tube (56) made of electrically insulating material and having a front terminal segment and a rear terminal segment which is adapted to be connected to a powder supply hose (84); and a bush (42) made of electrically conducting material, enclosing the powder tube (38) in sealing manner, and connectable to electrical ground to shunt electrical charges; wherein the front terminal segment (58) of the hookup tube (56) and the rear terminal segment (60) of the powder tube (38) are axially inserted into each other in overlapping and airtight manner so as to define an electrically insulating overlapping tube portion; said overlapping tube portion has a first end defined by the front terminal segment (58) of the hookup tube (56) and a second, opposite end defined by the rear terminal segment (60) of the powder tube (38), one of said first and second ends of said overlapping tube portion being positioned radially outwardly with respect to the other and defining an outer overlap end (78); and the bush (42) extends axially and rearwardly as far as or beyond the outer overlap end (78) for shunting any electrical charges that might issue at the outer overlap end (78).