US3750622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-pollution ventilation system for spray-type coating chambers
Assignee: Individual
•
Filing: 1971-06-11
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Granted: 1973-08-07
•
Expires: 1991-06-11
Abstract
Abstract An anti-pollution ventilation system includes means for circulating a fluid in a closed-loop path outside of a spray-type coating chamber. The circulating fluid is directed so as to form a fluid curtain across entrance and exit openings of the coating chamber. The system also includes a separator for continuously separating coating material from the circulating fluid. The separator comprises a plurality of side-by-side bores, having helical baffles therein, through which circulating fluid is directed. In one embodiment of the invention, some of the bores can be selectively closed. Means are included for transporting separated coating material from the separator back to the coating chamber for reuse. One refinement of the invention is to provide a bleeding means for bleeding fluid from the ventilation system, and another refinement is to provide a leakage collecting means for collecting leakage from the fluid curtains; in both cases a vapor-contaminant cleaner is provided to clean drained or leaked fluid before it is released to outside atmosphere. The ventilation system of this invention is further disclosed in combination with an irradiation type coating device wherein a coating chamber and an irradiating oven are located so close to one another that their inner atmospheres can mix. The inner atmospheres comprise mainly inert gases. In this embodiment, inert gas is bled from the ventilation system and fed to the irradiation oven.
Inventors
- 👤 A Repp
- 👤 W Berk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:13
CPC Classifications
B; B05; B05B; B05B14/00; B05B14/40; B05B14/44; B05B16/00; B05B16/20; B05B16/90; Y; Y02; Y02P; Y02P70/00; Y02P70/10; Y10; Y10S; Y10S55/00; Y10S55/29; Y10S55/46
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
272 words
A spray-type coating system comprising: a coating chamber of the type having a coating chamber opening through which work pieces can pass into said coating chamber along a work-piece path; a spraying device located in said chamber for receiving coating material and spraying said coating material in atomized form in said coating chamber, thereby establishing an atomized coatingmaterial environment inside said chamber; a coating-material reservoir in communication with said spraying device for continually feeding coating material to said spraying device; a ventilation system including, a motivating means for circulating gas and a duck-work means for guiding said circulating gas along an endless, closed, gas-flow path, said duct-work means defining a first port on one side of said coating-chamber opening and a second port on the other side of said coating-chamber opening, thereby establishing a duct-work gap across said coating-chamber opening, wherein said motivating means causes said circulating gas in said endless, closed, gas-flow path to travel out of said first port, across said coating-chamber opening in a substantially straight path, and into said second port to thereby produce a flowing gas curtain across said work-piece path through said opening, said ventilation system further including a separating means located in said duct-work system for separating coating material from said circulating gas; and a recapture means connected between said separating means and said coating-material reservoir for recapturing said separated coating material and transferring said recaptured coating material to said coating-material reservoir; whereby said circulating gas in said endless closed gas-flow path is continually cleaned by said separating means, and said coating material which is thereby recaptured is returned to said coating-material reservoir for reuse.
Claim 2
Dependent Claim
272 words
A spray-type coating system comprising: a coating chamber of the type having a coating chamber opening through which work pieces can pass into said coating chamber along a work-piece path; a spraying device located in said chamber for receiving coating material and spraying said coating material in atomized form in said coating chamber, thereby establishing an atomized coatingmaterial environment inside said chamber; a coating-material reservoir in communication with said spraying device for continually feeding coating material to said spraying device; a ventilation system including, a motivating means for circulating gas and a duck-work means for guiding said circulating gas along an endless, closed, gas-flow path, said duct-work means defining a first port on one side of said coating-chamber opening and a second port on the other side of said coating-chamber opening, thereby establishing a duct-work gap across said coating-chamber opening, wherein said motivating means causes said circulating gas in said endless, closed, gas-flow path to travel out of said first port, across said coating-chamber opening in a substantially straight path, and into said second port to thereby produce a flowing gas curtain across said work-piece path through said opening, said ventilation system further including a separating means located in said duct-work system for separating coating material from said circulating gas; and a recapture means connected between said separating means and said coating-material reservoir for recapturing said separated coating material and transferring said recaptured coating material to said coating-material reservoir; whereby said circulating gas in said endless closed gas-flow path is continually cleaned by said separating means, and said coating material which is thereby recaptured is returned to said coating-material reservoir for reuse.
Claim 3
Dependent Claim
17 words
A ventilation system as claimed in claim 1 wherein said separating means includes a helically shaped baffle.
Claim 4
Dependent Claim
35 words
A ventilation system as claimed in claim 1 wherein said separating means includes: an impervious frame supporting parallel tubes having bores therein; and, a helically shaped baffle in the bore of each of said tubes.
Claim 5
Dependent Claim
21 words
A ventilation system as claimed in claim 3 and further including a closing means for selectively closing some of said bores.
Claim 6
Dependent Claim
24 words
A ventilation system as claimed in claim 3 wherein said separating means further includes a liquid dispensing means for dispensing liquid on said tubes.
Claim 7
Dependent Claim
32 words
A ventilation system as claimed in claim 1 wherein is further included a bleeding system for bleeding a portion of said gas from said circulating gas in said endless, closed, gas-flow path.
Claim 8
Dependent Claim
29 words
A ventilation system as claimed in claim 6 wherein said bleeding system includes an adjustable means for adjusting the amount of gas bled from said endless, closed, gas-flow path.
Claim 9
Dependent Claim
23 words
A ventilation system as claimed in claim 7 wherein said bleeding system includes a contaminant cleaner for cleaning vapors from the bled-off gas.
Claim 10
Dependent Claim
25 words
A ventilation system as claimed in claim 6 wherein said bleeding system is connected downstream of said separating means and upstream of said gas curtain.
Claim 11
Dependent Claim
31 words
A ventilation system as claimed in claim 1 wherein is further included a leakage collecting system located in close proximity to said gas curtain for collecting leakage from said gas curtain.
Claim 12
Dependent Claim
26 words
A ventilation system as claimed in claim 10 wherein said leakage collecting system further includes a vapor-contaminant cleaner for cleaning contaminating vapors from said collected leakage.
Claim 13
Dependent Claim
21 words
A ventilation system as claimed in claim 10 wherein said leakage collecting system comprises a funnel positioned above said gas curtain.
Claim 14
Dependent Claim
25 words
A ventilation system as claimed in claim 12 wherein said leakage collecting system further includes a vapor contaminant cleaner for cleaning vapors from leakage collected.
References Cited (Backward Citations)
US18645A
Cited
US582892A
Cited
US983877A
Cited
US1520267A
Cited
US1970077A
Cited
US2057579A
Cited
US2074317A
Cited
US2014962A
Cited
US2216390A
Cited
US2487176A
Cited
US2827266A
Cited
FR1189075A
Cited
US3147135A
Cited
US3270711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |