Particle spray gun
US4819879A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Jul 13, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/0533
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An electrostatic particle spray gun having, in one preferred embodiment, a conical deflector of insulative material mounted in the nozzle in the particle path for forming a conical particle spray pattern. A resistive sheet connected to a high voltage electrostatic supply is sandwiched between the forward and rearward ends of the deflector, leaving only the perimeter of the sheet exposed at the peripheral region of the conical deflector. The perimeter of the resistive sheet functions as a multi-point circular electrode for charging the particles such that improved coating transfer efficiencies are achieved. Also, because of the resistive nature of the resistive sheet, the sheet constitutes a resistor in the electrical current path between the center of the sheet where it connects to a high voltage terminal and the circular periphery of the sheet which serves as the multiple point charging electrode, thereby minimizing unsafe electrical discharges should the electrode inadvertently approach a grounded object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.