| 摘要 |
<p>An apparatus (10) for transferring electrically conductive coating materials such as water-based paint from a source (15) to an electrostatically charged dispenser (54) includes first and second shuttle devices (24, 48) and two large reservoir, piston pumps (32, 52) each having structure for preventing contamination of the coating material and pressure build-up at their piston heads. The first shuttle device (24) is movable between a neutral position wherein it is electrically isolated from a filling station (14) connected to the coating material source (15), and a transfer position wherein coating material is transmitted to one of the piston pumps (32, 52) through a coupling device (20) which connects the filling station and first shuttle. The second shuttle device (48) is movable with respect to a discharge station (36) between a neutral position wherein the second shuttle (48) is spaced from the discharge station (36), and a transfer position wherein coating material is transmitted from the filled piston (32) pump, through another coupling device which connects the second shuttle (48) and discharge station (36) and then to the second piston pump (52) for transmission to one or more electrostatic coating dispensers (54). Movement of the shuttle is controlled to maintain one of the shuttles (24, 48) in the neutral position while the other is at the transfer position. <IMAGE></p> |
