US3575344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle and apparatus for electrostatic powder spraying
Assignee: ELECTROSTATIC EQUIPMENT CORP
•
Filing: 1969-09-22
•
Granted: 1971-04-20
•
Expires: 1989-09-22
Abstract
Abstract A nozzle for an electrostatic powder spray apparatus has a plug member which is generally circular in cross section mounted axially within a generally circular passage therethrough so as to provide an annular flow path therebetween. Adjacent its outlet end the plug member has a circumferential groove which serves to radially divert the powder particles that pass through the annular flow path.
Inventors
- 👤 Henry R Angelico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/025; B05B5/03; B05B5/032
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
Electrostatic powder-spraying apparatus comprising a nozzle having a generally circular interior passage therethrough and inlet and outlet ends; conduit means connected to the inlet end of said nozzle for delivering a gas suspension of particles thereto; charging means along the flow path of the suspension for electrically charging the particles thereof; and a plug member having a generally circular cross section mounted axially in said passage of said nozzle, said plug member being dimensioned and configured to seat within said passage with annular spacing between the circumferential surface of said plug member and the sidewall of said nozzle defining said passage to provide an annular flow path for the suspension, said plug member having in said surface a groove extending circumferentially about said plug member adjacent the outer end thereof to effect a radial diversion of the gas suspension passing thereover.
Claim 2
Dependent Claim
141 words
Electrostatic powder-spraying apparatus comprising a nozzle having a generally circular interior passage therethrough and inlet and outlet ends; conduit means connected to the inlet end of said nozzle for delivering a gas suspension of particles thereto; charging means along the flow path of the suspension for electrically charging the particles thereof; and a plug member having a generally circular cross section mounted axially in said passage of said nozzle, said plug member being dimensioned and configured to seat within said passage with annular spacing between the circumferential surface of said plug member and the sidewall of said nozzle defining said passage to provide an annular flow path for the suspension, said plug member having in said surface a groove extending circumferentially about said plug member adjacent the outer end thereof to effect a radial diversion of the gas suspension passing thereover.
Claim 3
Dependent Claim
55 words
The apparatus of claim 1 wherein the outlet end of said nozzle has an outwardly flared configuration, and wherein said plug member has a generally conical portion and is positioned with the smaller diameter end thereof directed inwardly of said nozzle passage, said circumferential groove being adjacent the larger diameter end of said plug member.
Claim 4
Dependent Claim
30 words
The apparatus of claim 2 wherein said plug member is adjustably mounted in said nozzle for axial movement within said passage to vary the dimensions of said annular flow path.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1 wherein said nozzle includes a metallic insert along said passage through which the suspension of particles must pass, said insert providing at least a portion of said charging means for the particles.
Claim 6
Dependent Claim
34 words
The apparatus of claim 4 wherein said insert has a portion generally conical in configuration, and wherein the edge at the outlet end thereof is relatively sharp to enhance the effectiveness of particle charging.
Claim 7
Dependent Claim
55 words
The apparatus of claim 1 wherein said gas suspension delivery means comprises a mixing chamber wherein saId gas suspension is produced, feed means for providing powder to said mixing chamber, and a source of gas under pressure connected to said mixing chamber, said mixing chamber being independent of said feed means and located outwardly thereof.
Claim 8
Dependent Claim
29 words
The apparatus of claim 6 wherein said mixing chamber is positioned below said feed means so that the powder is provided thereto at least in part by gravitational flow.
Claim 9
Dependent Claim
28 words
The apparatus of claim 6 wherein said mixing chamber is of a venturi type so that the powder is provided thereto at least in part by vacuum effects.
Claim 10
Dependent Claim
27 words
The apparatus of claim 7 wherein said feed means includes an inclined vibratory trough down which the powder migrates from a supply thereof to said mixing chamber.
References Cited (Backward Citations)
SU195083A1
Cited
US2498540A
Cited
US2609123A
Cited
US3263127A
Cited
US3327948A
Cited
US3346190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |