Powder spray gun
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Accused Products
Abstract
An electrostatic spray gun apparatus includes a spray gun housing and a nozzle attached to a spray end of the housing, and a powder path that extends in a substantially straight line along an axis of the housing from the powder inlet to the powder outlet. The powder path is in the form of an enclosed smooth powder passage that is substantially continuous and uninterrupted from the powder inlet to the powder outlet to eliminate substantially all recesses or gaps that could capture or trap powder. The powder passage is formed by a plurality of tubular segments that are aligned along the housing axis and abut end to end. that when assembled in the housing axially compress the segments together to substantially eliminate dead spots or recesses to form the continuous smooth powder path. A gun purge function is provided that allows a purge line to be installed on the gun assembly. A cartridge valve and conductor assembly is provided between the gun electrode in the nozzle and the output of the voltage multiplier. The cartridge includes a conductive path to provide electrical continuity from the multiplier to the gun electrode, and also includes valve, preferably in the form of a stem check valve, that closes when the gun electrode is removed or at least unseated from the nozzle. The gun also includes a tube mount arrangement wherein the tube mount is rigidly held together with the gun housing in axial compression by a tie bar.
46 Citations
45 Claims
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1-21. -21. Canceled.
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22. A powder spray apparatus comprising:
- a spray gun disposed in a gun housing; and
a ball mount for mounting said gun on a support bar;
said ball mount permitting alignment of said gun in a plurality of selectable vertical and horizontal angles. - View Dependent Claims (23, 24, 25)
- a spray gun disposed in a gun housing; and
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26-29. -29. Canceled.
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30. Air purge device for a powder spray gun, comprising:
- a gun housing with a powder spray nozzle at one end thereof;
a powder path extending from a powder inlet to said nozzle; and
an air purge inlet in fluid communication with said powder path through a transverse opening in said powder path. - View Dependent Claims (31, 32)
- a gun housing with a powder spray nozzle at one end thereof;
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33-38. -38. Canceled.
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39. An electrostatic powder spray gun comprising:
- a gun housing having a nozzle end and a powder inlet end along an axis;
said inlet end adapted to receive powder to be sprayed and said nozzle having an electrode and a powder outlet through which powder is sprayed toward a surface; and
an electrode holder in said housing;
said holder having an axial keyway and said housing having a key that engages said keyway when said holder is properly aligned within said housing during assembly. - View Dependent Claims (40)
- a gun housing having a nozzle end and a powder inlet end along an axis;
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42. The apparatus of claim 41 wherein said electrical contact engages said wire axially extending portion when the gun is assembled.
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43. The apparatus of claim 41 wherein said conductor comprises a wire connected to a resistive element, with the wire and resistive element being molded in a sleeve made of flexible material.
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45. Canceled.
Specification