Coating apparatus – With means to apply electrical and/or radiant energy to work... – Electrostatic and/or electromagnetic attraction or...
Patent
1975-01-29
1976-07-27
Rimrodt, Louis K.
Coating apparatus
With means to apply electrical and/or radiant energy to work...
Electrostatic and/or electromagnetic attraction or...
138137, 138141, 138146, 174 9F, B05B 502
Patent
active
039713377
ABSTRACT:
An electrostatic spray apparatus and method for spraying highly electrically conductive water-based coating material in which safety hazards are minimized. Included is a spray gun from which electrostatically charged water-based coating material is emitted toward an electrically grounded object to be coated; an enclosure of insulative material having upper and lower compartments electrically isolated from each other; a metallic coating supply container or tank located in the upper compartment for supplying coating material to the gun; an insulative hose interconnecting the tank and gun having a section thereof which passes through the lower compartment; a charging electrode located in the lower compartment in communication with the bore of the hose; a high voltage source connected to the charging electrode for charging the coating as it passes through the section of hose in the lower compartment; an opening in the upper compartment normally closed by a cover to facilitate access to the tank for replenishing the coating material; and a high voltage switch located in the lower compartment which is automatically actuated concommitantly with removal of the enclosure cover to electrically ground the charging electrode, and hence the system, thereby eliminating shock hazards when the tank is accessed for replenishment purposes and the like. Other features are also disclosed.
REFERENCES:
patent: 2784350 (1957-03-01), Sedlacsik
patent: 3412198 (1968-11-01), Wallis
patent: 3734139 (1973-05-01), Zafiroglu
patent: 3878312 (1975-04-01), Bergh et al.
Nordson Corporation
Rimrodt Louis K.
Salser Douglas
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