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Spray coating device for electrostatic spray coating

  • US 4,993,645 A
  • Filed: 01/25/1990
  • Issued: 02/19/1991
  • Est. Priority Date: 02/14/1989
  • Status: Expired due to Term
First Claim
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1. Spray coating apparatus for electrostatic spray coating of articles with coating material,with a gun barrel (2),with a spray nozzle (4) attached to the front end of the gun barrel,with a straight-line first channel (10) which extends axially to the spray nozzle through the gun barrel (2) and communicates with the spray nozzle (4),with a straight-line second channel (16) which extends through the gun barrel (2) from its rear end toward its front end, essentially parallel to the first channel (10),with a voltage generator (14) which is exchangeably inserted in the second channel (16), from the rear, and which consists at least of a transformer (57) located near the rear barrel end (74) and of a more forwardly situated voltage multiplier cascade (59), and features on the secondary side an electrical contact (61) by way of which it is electrically connected through an electrical conductor (62) with an electrode (64) serving to electrostatically charge the coating material,with a carrier (18) which detachably is fastened on the gun barrel (2),with a third channel (24), extending through the carrier (18), through which an electrical connector (40) of an electrical voltage supply cable (41) can be passed in order to detachably connect it electrically with the primary side electrical connectors (46, 50) of the voltage generator (14),wherein the rear end (74, 75) of the gun barrel (2) is in its length so graduated that its rear end features at the bottom a recess (20),in that the first channel (10) is located in the lower barrel part (76) of the gun barrel (2), which due to the recess is shorter than the remaining upper barrel part (78) of the gun barrel (2),in that the second channel (16) with the voltage generator (14) is located in the upper barrel part (78), which equal to the length of the recess (20) protrudes rearwardly beyond the lower part (76),in that the transformer (57) and the voltage multiplier cascade (59) of the voltage generator (14) are cast in a common plastic body which as a module is exchangeably arranged in the second channel (16),in that the voltage generator (14) extends within the second channel (16) with at least one-half the length of the transformer (57) rearwardly beyond the first channel (10),in that the second channel (16) is sealed liquid-tight at both of its ends (90, 92 at the rear end, end faces 3, 5 on the front end) so that no liquid can proceed to the voltage generator (14) in this second channel (16),in that a part (36) of the carrier (18) is fitted in the recess (20) at the bottom of the gun barrel (2), in that the third channel (24) extending through the carrier (18) and serving to accommodate the electrical connector (40) is straight, in that the connecting elements (46, 50) for the electrical connection of the primary side of the voltage generator (14) are relative to the inner end of the third channel (24) so arranged that they will automatically make contact with the electrical contacts (44) of the electrical connector (40) that are provided on the end of the connector (40), away from the voltage supply cable (41), as the connector (40) is passed from outside through the third channel (24), for which purpose the connector (40) is designed rod-shaped and stiff.

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