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US 4,792,092 AGranted
Paint color change system
AssigneeThe DeVilbiss Company
InventorsMichael D. Elberson, Raymond G. Plummer
Life of this patent
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AssigneeThe DeVilbiss Company
InventorsMichael D. Elberson, Raymond G. Plummer
Estimating the term…
A paint color change system and method for sequentially supplying different color electrically conductive paints to an electrostatic applicator. Paint is supplied through a supply hose to a first isolated reservoir and the supply hose is purged and dried to form a voltage block. While paint is supplied through a first delivery hose from the first reservoir to an applicator, a second reservoir is cleaned, paint is supplied to the second reservoir through a supply hose, and the supply hose is purged of paint and dried to form a voltage block. Upon completion of coating with the first color paint, the first delivery hose is purged of paint and dried to form a voltage block and paint then is supplied from the second reservoir through a second delivery hose to the coating applicator. If the same color paint is applied from both reservoirs, the first delivery hose can be cleaned and dried after paint delivery from the second reservoir has started to permit continuous coating.
An electrically isolating color change system for supplying selected colors of electrically conductive liquid coating materials to an electrostatic coating applicator, comprising, a plurality of different coating material supplies, first and second electrically insulated material reservoirs, electrically insulated means for supplying a predetermined quantity of coating material from a selected one of said supplies to a selected one of said reservoirs, means for cleaning said supply means after material is supplied to a reservoir to form an electrical barrier between said supply means and such reservoir, means for pressurizing a reservoir containing coating material, electrically insulated means for delivering coating material under pressure from a pressurized reservoir to the coating applicator, means for cleaning the other of said reservoirs while coating material is delivered from such pressurized reservoir to the coating applicator, said material supplying means including means for supplying a predetermined quantity of coating material from a selected one of said supplies to such other reservoir while coating material is delivered from such pressurized reservoir to the coating applicator, and means for cleaning said delivery means upon completion of coating with material from such pressurized reservoir to form an electrical barrier between said pressurized reservoir and the coating applicator.
A method for selectively supplying different color electrically conductive coating material to an electrostatic coating applicator comprising the steps of:
Dependencies are inferred from the claim text.