Airless spray gun having improved nozzle assembly and electrode circuit connections

An airless spray gun for electrostatically coating a substrate with an atomized liquid, comprising:

• a spray gun body having a forward end and a passage therethrough adapted to convey a liquid coating material which is under pressure to said forward end;
• a spray nozzle assembly adapted to be secured to said forward end of said gun body, said nozzle assembly including,
• a spray nozzle communicating with said coating material passage through which the coating material issues in an airless atomized spray,
• a nozzle mount for said spray nozzle having a bore through which the coating material passes to said nozzle,
• sealing means for connecting said nozzle mount bore with said liquid passage, said sealing means having an axial channel for flow of coating material from said liquid passage to said nozzle mount bore;
• an electrode for electrostatically charging atomized coating material;
• an electrode mount for said electrode which is concentric with said nozzle mount;
• said electrode having a forward portion extending through said electrode mount and adjacent said nozzle for generating an electrostatic field to charge the atomized coating material, and an integral rearward portion formed into a spiral spring;
• an electrical circuit means for carrying a high voltage to said electrode, said electrical circuit means including an electrode contact abutting said spring portion of said electrode, said electrode contact and said spring portion being in continuous electrical contact regardless of how said electrode mount is rotated;
• and
• said electrode spring portion engaging said sealing means and holding said sealing means and said nozzle mount together when said spray nozzle assembly is not secured to said gun body forward end.

An airless spray gun comprising:

• an elongated body having a passage therethrough adapted to be connected with a supply of liquid coating material under sufficient pressure to effect airless atomization of said liquid coating;
• a nozzle assembly adapted to be secured to said elongated body, said nozzle assembly including,
• an airless spray nozzle having a liquid passage therethrough,
• a nozzle adapter having an axial passage therethrough, said axial passage being coaxially aligned with said liquid passage, said nozzle being mounted in said nozzle adapter axial passage,
• a nozzle mounting ring having an axial passage therethrough, said axial passage being coaxially aligned with said liquid passage, said nozzle adapter being mounted within said nozzle mounting ring axial passage,
• sealing means between said adapter and said elongated body, said sealing means having an axial channel through which liquid can pass from said liquid passage through said sealing means to said nozzle adapter and nozzle passages;
• a single piece electrode carried by said nozzle mounting ring, said electrode having two forward portions extending through throughbores in said nozzle mounting ring and adjacent said nozzle for imparting a charge to fluid atomized by said nozzle, and a rearward portion formed in a spring spiral, and
• electrical circuit means for connecting said electrode to a voltage source, said electrical circuit means including resistor means and an electrode contact abutting said electrode spring spiral portion to electrically connect said electrical circuit means with said electrode.

An airless spray gun comprising:

• an elongated body having a passage therethrough adapted to be connected with a supply of liquid coating material under sufficient pressure to effect airless atomization of said liquid coating;
• a nozzle assembly adapted to be secured to said elongated body, said nozzle assembly including,
• an airless spray nozzle having a liquid passage therethrough,
• a nozzle adapter having an axial passage therethrough, said axial passage being coaxially aligned with said liquid passage, said nozzle being mounted in said nozzle adapter axial passage,
• a nozzle mounting ring having an axial passage therethrough, said axial passage being coaxially aligned with said liquid passage, said nozzle adapter being mounted within said nozzle mounting ring axial passage,
• sealing means between said adapter and said elongated body, said sealing means having an axial channel through which liquid can pass from said liquid passage through said sealing means to said nozzle adapter and nozzle passages;
• a single piece electrode carried by said nozzle mounting ring, said electrode having at least one forward portion extending through a throughbore in said nozzle mounting ring and adjacent said nozzle for imparting a charge to fluid atomized by said nozzle, and a rearward portion formed in a spring spiral, and
• electrical circuit means for connecting said electrode to a voltage source, said electrical circuit means including resistor means and an electrode contact abutting said electrode spring spiral portion to electrically connect said electrical circuit means with said electrode.