Apparatus and method for dispensing electrically conductive coating material including a pneumatic/mechanical control
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United States of America Patent
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-
Jan 13, 1998
Grant Date -
N/A
app pub date -
Dec 6, 1996
filing date -
Jun 11, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for transferring electrically conductive coating material comprises a filling station having a first coupling element connected to a source of the coating material and a shuttle carrying a second coupling element which is movable with respect to the filling station between a paint transfer position in which the coupling elements engage and a neutral position physically spaced from the filling station. The shuttle, in turn, is connected to the reservoir of a piston pump which communicates with one or more air operated or air assist spray guns. A high-voltage power supply is connected to the metal body of the piston pump to charge the electrically conductive coating material immediately before it is supplied to the spray gun. A pneumatic/mechanical control system controls the operation of the shuttle, pump and electrostatic power supply to ensure that a voltage block is maintained between the source of coating material and the electrostatically charged coating material which is discharged from the spray gun.
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