US3921576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray booth
Assignee: C-I-L Inc A CORP OF CANADA
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Filing: 1974-01-24
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Granted: 1975-11-25
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Expires: 1994-01-24
Abstract
Abstract A spray booth for use in the electrostatic spraying of powder paint has a spray chamber defined by walls, at least one of which has a wall panel facing inwardly of the spray chamber and made of porous material. An enclosure of gas-impervious material secured in sealed relation to the side of the wall panel opposite to the spray chamber forms, with the panel, a gas chamber, to which gas is supplied under pressure. The gas passes through the porous panel and thereby counteracts deposition of paint powder on the panel, thus facilitating cleaning of the booth and color changeover and reducing color contamination after color changeover.
Inventors
- 👤 Charles R Vertue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:22
CPC Classifications
B; B05; B05B; B05B14/00; B05B14/40; B05B14/41; B05B14/412
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
166 words
A spray booth comprising: a top, a bottom and a plurality of walls defining a spray chamber; at least one of said walls comprising a wall panel having one side facing inwardly of said spray chamber; said wall panel comprising a porous material; an enclosure of gas-impervious material at the opposite side of said wall panel and secured in sealed relationship to said wall panel to form with said panel a gas chamber; means for supplying gas under pressure into said gas chamber; an outer housing spaced outwardly of said walls; an opposed pair of said walls and opposed walls of said outer housing defining upwardly open openings for the passage of a conveyed workpiece through said spray booth and through said spray chamber; and partition walls extending from the openings in said opposed spray chamber walls to said opposed outer housing walls and forming an inlet passage and an outlet passage for movement of the workpiece to and from the interior of said spray chamber.
Claim 2
Dependent Claim
166 words
A spray booth comprising: a top, a bottom and a plurality of walls defining a spray chamber; at least one of said walls comprising a wall panel having one side facing inwardly of said spray chamber; said wall panel comprising a porous material; an enclosure of gas-impervious material at the opposite side of said wall panel and secured in sealed relationship to said wall panel to form with said panel a gas chamber; means for supplying gas under pressure into said gas chamber; an outer housing spaced outwardly of said walls; an opposed pair of said walls and opposed walls of said outer housing defining upwardly open openings for the passage of a conveyed workpiece through said spray booth and through said spray chamber; and partition walls extending from the openings in said opposed spray chamber walls to said opposed outer housing walls and forming an inlet passage and an outlet passage for movement of the workpiece to and from the interior of said spray chamber.
Claim 3
Dependent Claim
15 words
A spray booth as claimed in claim 1, wherein said porous material comprises porous asbestos.
Claim 4
Dependent Claim
15 words
A spray booth as claimed in claim 1, wherein said porous material comprises porous polyvinylchloride.
Claim 5
Dependent Claim
41 words
A spray booth as claimed in claim 1, wherein said partition walls of the outlet passage define suction slots, and means are provided for applying a partial vacuum to said suction slots to suck unused spray material from said outlet passage.
Claim 6
Dependent Claim
185 words
A spray booth comprising: a top, a bottom and four walls defining a spray chamber, said four walls forming front, rear and side walls of said spray chamber; each of said top, said bottom and said four walls comprising a panel having one side facing inwardly of said spray chamber; each of said panels comprising a porous material; at least one enclosure of gas-impervious material at the opposite side of each of said panels; said enclosures being secured in sealed relationship to the respective panels to form, with said panels, gas chambers; means for supplying gas under pressure into said gas chambers; an outer housing spaced outwardly of said walls; an opposed pair of said walls and opposed walls of said outer housing defining upwardly open openings for the passage of a conveyed workpiece through said spray booth and through said spray chamber; and partition walls extending from the openings in said opposed spray chamber walls to said opposed outer housing walls and forming an inlet passage and an outlet passage for movement of the workpiece to and from the interior of said spray chamber.
Claim 7
Dependent Claim
185 words
A spray booth comprising: a top, a bottom and four walls defining a spray chamber, said four walls forming front, rear and side walls of said spray chamber; each of said top, said bottom and said four walls comprising a panel having one side facing inwardly of said spray chamber; each of said panels comprising a porous material; at least one enclosure of gas-impervious material at the opposite side of each of said panels; said enclosures being secured in sealed relationship to the respective panels to form, with said panels, gas chambers; means for supplying gas under pressure into said gas chambers; an outer housing spaced outwardly of said walls; an opposed pair of said walls and opposed walls of said outer housing defining upwardly open openings for the passage of a conveyed workpiece through said spray booth and through said spray chamber; and partition walls extending from the openings in said opposed spray chamber walls to said opposed outer housing walls and forming an inlet passage and an outlet passage for movement of the workpiece to and from the interior of said spray chamber.
Claim 8
Dependent Claim
30 words
A spray booth as claimed in claim 5, wherein said enclosures are formed by sheet metal sealingly secured to said panels, and said porous material comprises a rigid, self-supporting material.
Claim 9
Dependent Claim
40 words
A spray booth as claimed in claim 5, wherein an opposed pair of said walls define openings for the passage of a conveyed workpiece through said spray chamber, and at least one spray gun is mounted within said spray chamber.
Claim 10
Dependent Claim
28 words
A spray booth as claimed in claim 5, wherein one of said walls comprise a door pivotable into an open position to allow access to the spray chamber.
Claim 11
Dependent Claim
18 words
A spray booth as claimed in claim 5, wherein said walls are spaced inwardly of an outer housing.
Claim 12
Dependent Claim
15 words
A spray booth as claimed in claim 5, wherein said porous material comprises porous asbestos.
Claim 13
Dependent Claim
15 words
A spray booth as claimed in claim 5, wherein said porous material comprises porous polyvinylchloride.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |