초록 ▼

A spray gun for airless atomization for electrostatic deposition of a coating material upon a substrate includes a novel dual electrode element having a spring loop portion. The two electrodes are the respective end portions of a single electrode wire, which has its major portion between the electro

A spray gun for airless atomization for electrostatic deposition of a coating material upon a substrate includes a novel dual electrode element having a spring loop portion. The two electrodes are the respective end portions of a single electrode wire, which has its major portion between the electrodes formed into a spiral spring. A tip resistor is provided with a conductive fitting that presents a broad and sturdy bearing surface which abuts the electrode spring portion to thereby directly connect the electrode with a high voltage charging circuit. The electrode spring accommodates spacing variations between the electrode and tip resistor, and provides a continuous electrical connection regardless of the rotational position of the electrode relative to the tip resistor. The dual electrode spring further serves to secure a number of otherwise loose parts of the gun nozzle assembly together, and prevents the parts from falling out and getting lost when the nozzle assembly is removed from the spray gun. An improved electrical circuit is also achieved through the use of a conductive cap which surrounds one end of a high voltage barrel resistor used in the gun. The conductive cap has a portion which extends along the barrel resistor body which is electrically connected to the tip resistor by a spring lead from the tip resistor.

대표청구항 ▼

An airless spray gun for electrostatically coating a substrate with an atomized liquid, comprising: a spray gun body having a passage therethrough adapted to convey a liquid coating material which is under pressure; a spray nozzle through which coating material can issue in an airless atomized spray

An airless spray gun for electrostatically coating a substrate with an atomized liquid, comprising: a spray gun body having a passage therethrough adapted to convey a liquid coating material which is under pressure; a spray nozzle through which coating material can issue in an airless atomized spray; spray nozzle mounting means for removeably mounting said spray nozzle on said spray gun body and in fluid communication with said liquid passage for flow of coating material from said liquid passage to said nozzle; an electrode, said electrode carried by said spray nozzle mounting means and having a forward portion extending from said spray nozzle mounting means and adjacent said nozzle for generating an electrostatic field to charge the atomized coating material, and a rearward portion formed into a spiral spring; electrical circuit means for carrying a high voltage to said electrode, said electrical circuit means including an electrode contact member engaging said spring portion of said electrode for electrical connection of said electrode to said electrical circuit means; said spray nozzle mounting means including a nozzle mount for said nozzle having a bore through which the coating material passes to said nozzle, and 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, said electrode spring portion engaging said sealing means and holding said sealing means and said nozzle mount together when said spray nozzle mounting means is removed from said spray gun body.