Title: Apparatus for the electrostatic coating of workpieces

Abstract: An electrostatic spray apparatus wherein a charging chamber is formed as an enlargement in the conduit feed to the spray nozzle. The charging electrode is disposed axially of the conduit with a pointed end located at the exit end of the enlargement and facing upstream of a particle stream flow and opposed to a counterelectrode end located at the inlet side of said enlargement. The counterelectrode may be an obtuse end of an elongated element or may be formed as a grid extending across the conduit or as an annular element formed about a wall of the conduit. Optionally shown are a plurality of enlarged charging chambers, as annular element forming a constricted flow path and a charging electrode second end extending beyond the spray nozzle. Means introduce an air flow into the particle stream at both the nozzle and at the charging chamber.

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Inventors: Benedek, Gyorgy (Budapest, HU)
Hornung, Peter (Budapest, HU)

Application Number: 780472
Filing Date: 1977-03-23
Publication_date: 1979-01-23
Assignee: Hajtomuvek es Festoberendezesek Gyara (Budapest, HU)
Primary Class(es): 239/697 239/707
Other Classes:
US Patent Ref:

3521125	Jul, 1970	Nelson	239/15.
3659151	Apr, 1972	Fabre	361/227.
3673463	Jun, 1972	Gourdine	361/227.
3745413	Jul, 1973	Whitmore	361/229.
3895261	Jul, 1975	Merkind et al.	361/227.
4020393	Apr, 1977	Porter	361/227.
4039145	Aug, 1977	Felici et al.	239/15.

Other Refs:
Primary Examiner: Kaplan, Morris
Assistant Examiner:
Attorney: