Airless spray gun having tip discharge resistance
US4611762A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1984 |
| Grant date | Sep 16, 1986 |
| Priority date | — |
| Expiry date | Oct 26, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/035
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A spray gun for airless atomization and electrostatic deposition of a coating material upon a substrate, including a gun nozzle tip element serving to prevent arcing from the gun nozzle tip to an adjacent electrical ground. As disclosed, the airless spray gun includes a metallic nozzle tip from which atomized liquid coating material is emitted, and the thus-emitted coating material is charged by an electrode mounted on the nozzle which is electrically isolated from the metallic tip. During use of the spray gun, the metallic tip becomes charged via electrical charge conduction through the emitted atomized coating material. To prevent arcing from the charged tip to an electrical ground, a pair of resistive threads are secured in bores in the spray gun nozzle, each having a first end electrically connected to the conductive tip and a second end extending slightly beyond the nozzle. If an electrical ground approaches the charged conductive tip, the resistive threads are positioned such that electrical energy on the tip is coupled to the electrical ground through one or both of the resistive threads in the form of a low energy corona discharge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.