US3667676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for electrostatically coating powders on a workpiece
Assignee: Nippon Kogei Kogyo Co Ltd
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Filing: 1969-12-18
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Granted: 1972-06-06
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Expires: 1989-12-18
Abstract
Abstract Apparatus for electrostatically coating powders on a workpiece from a rotating injection head having a plurality of nozzles disposed outwardly from the axis of the rotating injection head and rotatably mounted on the injection head for dispersing the powders. Each of the nozzles has a curved or bent portion, such that the distance between the nozzle and the axis of the rotating injection head and the angle from which the powders are dispersed are variable. The apparatus is utilized for performing a method of electrostatically coating powders on a workpiece comprising the steps of dispersing the powders in such a manner that the angle at which the powders are dispersed is variable. The apparatus also comprises a mixer connected to a source of compressed air for supplying the powders from a source through a pipe into the injection head with an air stream fed from a compressed air source, a controller for controlling the powder supply from the powder source to the injection head, and a constant powder supplying means for supplying the powders from the powder source to the mixer, whereby the powder supply is controlled by the powder supply means.
Inventors
- 👤 Tamotsu Watanabe
- 👤 Fumio Onoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B05B7/144; B05B7/1445; B05B5/00; B05B5/025; B05B5/04; B05B5/0403; B05B5/0418; B05B5/16; B05B5/1683; B05B7/1477
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
235 words
A rotary powder injection head for apparatus for electrostatically coating powdered materials onto a workpiece comprising at least one nozzle having a bent portion and rotatably mounted by means of a fitting on said injection head such that the distance between the axis of rotation of said head and the injection port of said nozzle is variable whereby the injection angle of said powder material is variable, powder supply means for supplying powder coating materials by means of an air stream, a flexible supply line connected to said powder supply means, a plurality of injection nozzles attached to said rotary head, a tubular conduit of insulating material having the end portion thereof of electroconductive material, and connected through a coupling to said flexible supply line for feeding said powder from said powder supply means to said injection nozzles, a drive motor for driving said rotary head through said tubular conduit, a hollow pulley mounted on said conduit and having a belt wound thereon, bearings for supporting said tubular conduit at both ends, supporting means mounted at both ends of said tubular conduit for supporting said beArings and said tubular conduit, a tubular supporting member mounted on said tubular conduit between said supporting members for isolating high voltage from ground, a high voltage power supply electrically connected through a cable, and means for producing an electric field between the ground and the article to be coated.
Claim 2
Dependent Claim
235 words
A rotary powder injection head for apparatus for electrostatically coating powdered materials onto a workpiece comprising at least one nozzle having a bent portion and rotatably mounted by means of a fitting on said injection head such that the distance between the axis of rotation of said head and the injection port of said nozzle is variable whereby the injection angle of said powder material is variable, powder supply means for supplying powder coating materials by means of an air stream, a flexible supply line connected to said powder supply means, a plurality of injection nozzles attached to said rotary head, a tubular conduit of insulating material having the end portion thereof of electroconductive material, and connected through a coupling to said flexible supply line for feeding said powder from said powder supply means to said injection nozzles, a drive motor for driving said rotary head through said tubular conduit, a hollow pulley mounted on said conduit and having a belt wound thereon, bearings for supporting said tubular conduit at both ends, supporting means mounted at both ends of said tubular conduit for supporting said beArings and said tubular conduit, a tubular supporting member mounted on said tubular conduit between said supporting members for isolating high voltage from ground, a high voltage power supply electrically connected through a cable, and means for producing an electric field between the ground and the article to be coated.
Claim 3
Dependent Claim
42 words
A rotary powder injection head as set forth in claim 1, wherein said rotary head comprises an inlet port for receiving said powders from said powder supply means through said conduit and a passage in said injection nozzle to said injection port.
Claim 4
Dependent Claim
131 words
Apparatus for electrostatically coating powdered materials onto a workpiece comprising a rotary powder injection head, a powder-air mixer for mixing said powders with compressed air supplied from a source of compressed air and a constant powder means for supplying said powders at a constant rate in response to the size and shape of the article to be coated so as to provide an even coating of said powdered materials onto said article, wherein said constant powder supply means comprises a hopper for containing the powders therein, a trough mounted beneath said hopper, a vibrator mounted beneath said trough and connected to a supply rate controller electrically connected to a source of power, said supply rate controlling member provided beneath the terminal portion of said trough for receiving powder materials falling therefrom.
Claim 5
Dependent Claim
131 words
Apparatus for electrostatically coating powdered materials onto a workpiece comprising a rotary powder injection head, a powder-air mixer for mixing said powders with compressed air supplied from a source of compressed air and a constant powder means for supplying said powders at a constant rate in response to the size and shape of the article to be coated so as to provide an even coating of said powdered materials onto said article, wherein said constant powder supply means comprises a hopper for containing the powders therein, a trough mounted beneath said hopper, a vibrator mounted beneath said trough and connected to a supply rate controller electrically connected to a source of power, said supply rate controlling member provided beneath the terminal portion of said trough for receiving powder materials falling therefrom.
Claim 6
Dependent Claim
77 words
Apparatus as set forth in claim 3, wherein said powder-air mixer comprises a source of compressed air connected through an air supply pipe to said powder-air mixer and a powder mixture supply line connected from said powder-air mixer to said powder injection head, a powder receiving inlet, an air inlet, and a powder-air mixture supply port, an air injection port communicating with said air inlet, and an air introducing inlet communicating with said powder-air mixture supply port.
Claim 7
Dependent Claim
58 words
Apparatus as set forth in claim 4, wherein said supply rate controlling member is so disposed above a plurality of mixers provided beneath the terminal end of said trough as to rotate about a shaft to control the distribution of powder falling on said mixer by adjusting the position relative to said trough at the upper end thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |