Patent · US Expired

Apparatus for electrostatic coating of objects

US4771949A · kind A · utility

16Cited by

5References

12Claims

0Family size

Assignee

Hermann Behr & Sohn GmbH & Co. · DE

Inventors

Hans Behr · Stuttgart, DE
Kurt Vetter · Cicero, US
Rolf Schneider · Burgstetten, DE
Fred Luderer · Leutenbach, DE

Key dates

Filing date	Jan 22, 1986
Grant date	Sep 20, 1988
Priority date	—
Expiry date	Jan 22, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB05B5/0426
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An electrostatic spray coating assembly (10) for atomizing electrically conductive material comprises a rotary atomizer spray head (12) having an annular atomizing spraying edge (14). An external housing (22) supports the spray head (12) and a feed line (18) supplies the material from a supply system to the spraying edge (14) of the spray head (12). The feed line (18) and the material supplied thereby and the spray head (12) are electrically grounded. Three needle-shaped charging electrodes (36) are in spaced relationship circumferentially at uniform angular intervals with respect to the spray head (12). The charging electrodes (36) are connected to a source of high voltage potential for producing an electrical field charging the conductive material. The charging electrodes (36) are positioned from the spraying edge (14) of the spray head (12) a predetermined radial distance (R) at least twice the diameter (d) of the spraying edge (14) of the spray head (12).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.