Patent US3714926A successfully refreshed from Google Patents.
US3714926A
Expired / Lapsed
US
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Apparatus for electrostatically coating the surfaces of articles with pulverulent materials
Assignee: SFB SPEZIAL FILLERBAU OFNER M
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Filing: 1970-12-09
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Granted: 1973-02-06
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Expires: 1990-12-09
Abstract
Abstract An apparatus for electrostatically coating the surfaces of articles with pulverulent materials, especially coloring substances, by spraying the material dispersed in an air current upon the article and permitting the recovery of the excessive material which is drawn off by suction from the spray chamber, treated, and then returned to the supply for immediate reuse in the spraying operation.
Inventors
- 👤 M Ofner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:53
CPC Classifications
B; B05; B05B; B05B14/00; B05B14/40; B05B14/45; B05B14/48; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
179 words
An apparatus for electrostatically coating the surfaces of articles with pulverulent materials, especially coloring substances, comprising a charging and spraying device, means for supplying the new material to be sprayed to said spraying device so as to be electrically charged therein and sprayed therefrom upon an article to be coated, a suction station for drawing off the excessive material not adhering to said article, a blower having a suction side and a pressure side for creating an air current, a separator for separating the larger particles of said excessive material from said air current, means for connecting said blower with said separator and said suction station for transporting said excessive material from said suction station to said separator, filter means for separating the smaller particles of said excessive material from said air current, means for collecting said larger and smaller particles and for thoroughly mixing them with each other, means for eliminating the electric charge from said particles, and means for conveying said mixed uncharged particles to said charging and spraying device to be recharged therein and sprayed therefrom.
Claim 2
Independent Claim
179 words
An apparatus for electrostatically coating the surfaces of articles with pulverulent materials, especially coloring substances, comprising a charging and spraying device, means for supplying the new material to be sprayed to said spraying device so as to be electrically charged therein and sprayed therefrom upon an article to be coated, a suction station for drawing off the excessive material not adhering to said article, a blower having a suction side and a pressure side for creating an air current, a separator for separating the larger particles of said excessive material from said air current, means for connecting said blower with said separator and said suction station for transporting said excessive material from said suction station to said separator, filter means for separating the smaller particles of said excessive material from said air current, means for collecting said larger and smaller particles and for thoroughly mixing them with each other, means for eliminating the electric charge from said particles, and means for conveying said mixed uncharged particles to said charging and spraying device to be recharged therein and sprayed therefrom.
Claim 3
Independent Claim
179 words
An apparatus for electrostatically coating the surfaces of articles with pulverulent materials, especially coloring substances, comprising a charging and spraying device, means for supplying the new material to be sprayed to said spraying device so as to be electrically charged therein and sprayed therefrom upon an article to be coated, a suction station for drawing off the excessive material not adhering to said article, a blower having a suction side and a pressure side for creating an air current, a separator for separating the larger particles of said excessive material from said air current, means for connecting said blower with said separator and said suction station for transporting said excessive material from said suction station to said separator, filter means for separating the smaller particles of said excessive material from said air current, means for collecting said larger and smaller particles and for thoroughly mixing them with each other, means for eliminating the electric charge from said particles, and means for conveying said mixed uncharged particles to said charging and spraying device to be recharged therein and sprayed therefrom.
Claim 4
Independent Claim
179 words
An apparatus for electrostatically coating the surfaces of articles with pulverulent materials, especially coloring substances, comprising a charging and spraying device, means for supplying the new material to be sprayed to said spraying device so as to be electrically charged therein and sprayed therefrom upon an article to be coated, a suction station for drawing off the excessive material not adhering to said article, a blower having a suction side and a pressure side for creating an air current, a separator for separating the larger particles of said excessive material from said air current, means for connecting said blower with said separator and said suction station for transporting said excessive material from said suction station to said separator, filter means for separating the smaller particles of said excessive material from said air current, means for collecting said larger and smaller particles and for thoroughly mixing them with each other, means for eliminating the electric charge from said particles, and means for conveying said mixed uncharged particles to said charging and spraying device to be recharged therein and sprayed therefrom.
Claim 5
Dependent Claim
42 words
An apparatus as defined in claim 1, wherein said collecting means comprise a container in which said particles are collected and mixed by further air currents, said container having grounded wall surfaces forming said means for eliminating said charge from said particles.
Claim 6
Dependent Claim
14 words
An apparatus as defined in claim 1, wherein said separator is a cyclone separator.
Claim 7
Dependent Claim
16 words
An apparatus as defined in claim 1, wherein said filter means is mounted on said separator.
Claim 8
Dependent Claim
16 words
An apparatus as defined in claim 2, wherein said filter means is mounted within said container.
Claim 9
Dependent Claim
17 words
An apparatus as defined in claim 3, wherein said filter means is mounted within said cyclone separator.
Claim 10
Dependent Claim
58 words
An apparatus as defined in claim 2, comprising means for screening the mixed particles, and wherein said container has a conical lower part having a large surface area and tapering downwardly at an angle of at least 90*, and a central outlet channel connected to the lower end of said lower part and leading to said screening means.
Claim 11
Dependent Claim
62 words
An apparatus as defined in claim 7, further comprising a plurality of nozzles peripherally spaced from each other and connected to and pointed upwardly into said lower part of said container and means for passing blasts of compressed air at predetermined intervals through said nozzles into said lower part for loosening said particles therein and preventing them from clogging said outlet channel.
Claim 12
Dependent Claim
53 words
An apparatus as defined in claim 7, further comprising a porous layer on the inner side of at least said lower part of said container, and means for passing compressed air from the outside through said layer into said container for loosening said particles therein and preventing them from clogging said outlet channel.
Claim 13
Dependent Claim
24 words
An apparatus as defined in claim 9, further comprising an electrically conductive grounded coating at least on the inner side of said porous layer.
Claim 14
Dependent Claim
34 words
An apparatus as defined in claim 7, further comprising dosing means interposed between said lower part of said container and said screening means for passing predetermined amounts of said particles to said screening means.
Claim 15
Dependent Claim
21 words
An apparatus as defined in claim 11, wherein said dosing means comprise a gate wheel, and means for rotating said wheel.
Claim 16
Dependent Claim
54 words
An apparatus as defined in claim 1, further comprising means for screenIng the mixed particles, and a spray chamber containing said suction station attached to the area of said apparatus containing said screening means, said connecting means of said suction side of said blower having a plurality of suction openings in said suction station.
Claim 17
Dependent Claim
71 words
An apparatus as defined in claim 1, comprising a frame and at least two equal units mounted on said frame and each having one of said separators, blowers, filter means, charge eliminating means, screening means, and conveying means, the suction sides of said blowers being connected to at least one suction station, and control means for connecting said screening means of one or both of said units to said spraying device.
Claim 18
Dependent Claim
57 words
An apparatus as defined in claim 1, wherein said means for supplying the new material to be sprayed to said spraying device are also connected to the suction side of said blower so as to be combined with and treated together with the recovered excessive material before being conveyed with said recovered material to said spraying device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |