Spray coating apparatus

Abstract

Abstract AN ELECTROSTATIC SPRAY GUN FOR FORMING A SPARY OF AIRATOMIZED, ELECTRICALLY CHARGED PAINT PARTICLES COMPRISES A GROUNDED METAL BARREL HAVING AT ITS FORWARD END A PASSAGE WITHIN WHICH THE SPRAY IS FORMED. PAINT IS SUPPLIED TO SUCH PASSAGE THROUGH A NARROW ANNULAR PAINT ORIFICE IN THE PASSAGE WALL AND IS ATOMIZED BY AN AIRSTREAM DIRECTED INWARDLY AND FORWARDLY OF THE PASSAGE FROM AN ANNULAR AIR ORIFICE LOCATED IMMEDIATELY REARWARD OF THE PAINT ORIFICE. AN IONIZING ELECTRODE SUPPORTED IN REAR OF THE PAINT AND AIR ORIFICES EXTENDS FORWARDLY ON THE AXIS OF THE PASSAGE PAST THE PAINT ORIFICE AND TERMINATES AT A POINT SPACED REARWARDLY FROM THE FORWARD END OF THE PASSAGE. AN APPROPRIATE VOLTAGE SOURCE MAINTAINS THE ELECTRODE AT ELEVATED POTENTIAL TO CREATE BETWEEN THE ELECTRODE AND THE WALL OF THE PASSAGE AN ELECTROSTATIC FIELD THROUGH WHICH THE SPRAY PASSES IMMEDIATELY AFTER IT IS FORMED.

Inventors

• 👤 David H Badger

Bibliographic Details