US3870016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Box for powder coating
Assignee: Otto Durr Anlagen fuer Oberflachentechnik Firma
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Filing: 1972-07-03
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Granted: 1975-03-11
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Expires: 1992-07-03
Abstract
Abstract The box is used for powder coating of a workpiece, such as for coating a workpiece with synthetic resin powder. The box has a front wall, side walls, a rear wall, a base and a top wall, and a nozzle in the front wall directs an air-powder stream substantially centrally and horizontally of the box toward a workpiece in the box positioned on the axis of the air powder stream, to provide a powder cloud surrounding the workpiece. Air inlet means, such as slots or nozzles, in the side walls provide rinsing air flows directed substantially tangentially of the powder cloud to impart thereto a rotary motion about the axis of the air-powder stream and counteracting the force of gravity on the powder cloud. Air outlet apertures are formed in the rear wall substantially symmetrical with the axis of the air powder stream. An endless air-permeable belt extends along the inner surfaces of the side walls, base and top wall and is driven to move in a direction transversely of the axis of the air-powder stream. The endless belt receives powder carried toward the side walls, base and top wall and delivers this powder to the rinsing air flows for return to the powder cloud. One or more endless conveyors are positioned adjacent the base of the box to receive powder falling onto the base and to remove the received powder to prevent powder accumulation. The powder-air flow is focused in the direction of the axis of the air-powder stream by virtue of the mentioned rotary motion which has the characteristics of a well-known cyclone.
Inventors
- 👤 Dr-Ing Udo U Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
B; B05; B05B; B05B14/00; B05B14/40; B05B14/41; Y; Y10; Y10S; Y10S118/00; Y10S118/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
210 words
In a box for powder coating of a workpiece, of the type having a front wall, side walls, a rear wall, a base and a top wall, and nozzle means in the front wall operable to direct an air-powder stream, substantially centrally and horizontally of the box, toward a workpiece in the box, positioned on the axis of the air-powder stream, to provide a powder cloud surrounding the workpiece, the improvement comprising, in combination, air inlet means in said side walls; means connected to said air inlet means and producing air flows directed through said air inlet means substantially tangentially of said powder cloud to impart thereto a supporting rotary motion maintaining said powder cloud about said axis and the workpiece and counteracting the force of gravity on said powder cloud; air outlet means in said rear wall substantially symmetrical with said axis for discharge of the air flows carrying excess powder from said powder cloud; conveyor means receiving powder carried toward the walls of said box and delivering the received powder to said rinsing air flows for return thereby to said powder cloud; and a conveyor device adjacent said base receiving any powder falling onto said base and removing the received powder to prevent powder accumulation onto said base.
Claim 2
Dependent Claim
210 words
In a box for powder coating of a workpiece, of the type having a front wall, side walls, a rear wall, a base and a top wall, and nozzle means in the front wall operable to direct an air-powder stream, substantially centrally and horizontally of the box, toward a workpiece in the box, positioned on the axis of the air-powder stream, to provide a powder cloud surrounding the workpiece, the improvement comprising, in combination, air inlet means in said side walls; means connected to said air inlet means and producing air flows directed through said air inlet means substantially tangentially of said powder cloud to impart thereto a supporting rotary motion maintaining said powder cloud about said axis and the workpiece and counteracting the force of gravity on said powder cloud; air outlet means in said rear wall substantially symmetrical with said axis for discharge of the air flows carrying excess powder from said powder cloud; conveyor means receiving powder carried toward the walls of said box and delivering the received powder to said rinsing air flows for return thereby to said powder cloud; and a conveyor device adjacent said base receiving any powder falling onto said base and removing the received powder to prevent powder accumulation onto said base.
Claim 3
Dependent Claim
210 words
In a box for powder coating of a workpiece, of the type having a front wall, side walls, a rear wall, a base and a top wall, and nozzle means in the front wall operable to direct an air-powder stream, substantially centrally and horizontally of the box, toward a workpiece in the box, positioned on the axis of the air-powder stream, to provide a powder cloud surrounding the workpiece, the improvement comprising, in combination, air inlet means in said side walls; means connected to said air inlet means and producing air flows directed through said air inlet means substantially tangentially of said powder cloud to impart thereto a supporting rotary motion maintaining said powder cloud about said axis and the workpiece and counteracting the force of gravity on said powder cloud; air outlet means in said rear wall substantially symmetrical with said axis for discharge of the air flows carrying excess powder from said powder cloud; conveyor means receiving powder carried toward the walls of said box and delivering the received powder to said rinsing air flows for return thereby to said powder cloud; and a conveyor device adjacent said base receiving any powder falling onto said base and removing the received powder to prevent powder accumulation onto said base.
Claim 4
Dependent Claim
210 words
In a box for powder coating of a workpiece, of the type having a front wall, side walls, a rear wall, a base and a top wall, and nozzle means in the front wall operable to direct an air-powder stream, substantially centrally and horizontally of the box, toward a workpiece in the box, positioned on the axis of the air-powder stream, to provide a powder cloud surrounding the workpiece, the improvement comprising, in combination, air inlet means in said side walls; means connected to said air inlet means and producing air flows directed through said air inlet means substantially tangentially of said powder cloud to impart thereto a supporting rotary motion maintaining said powder cloud about said axis and the workpiece and counteracting the force of gravity on said powder cloud; air outlet means in said rear wall substantially symmetrical with said axis for discharge of the air flows carrying excess powder from said powder cloud; conveyor means receiving powder carried toward the walls of said box and delivering the received powder to said rinsing air flows for return thereby to said powder cloud; and a conveyor device adjacent said base receiving any powder falling onto said base and removing the received powder to prevent powder accumulation onto said base.
Claim 5
Dependent Claim
31 words
In a box for powder coating of a workpiece, the improvement claimed in claim 1, in which sAid conveyor means comprises an endless belt moving adjacent the walls of said box.
Claim 6
Dependent Claim
35 words
In a box for powder coating of a workpiece, the improvement claimed in claim 2, in which said endless belt covers at least part of said side walls, base and top wall of said box.
Claim 7
Dependent Claim
42 words
In a box for powder coating of a workpiece, the improvement claimed in claim 2, in which said air inlet means comprises rinsing air slots directing the rinsing air to flow tangentially of said powder cloud at a selected angle of tangency.
Claim 8
Dependent Claim
30 words
In a box for powder coating of a workpiece, the improvement claimed in claim 2, in which the direction of movement of said endless belt is transversely of said axis.
Claim 9
Dependent Claim
45 words
In a box for powder coating of a workpiece, the improvement claimed in claim 2, in which said air inlet means comprises rinsing air slots; said rinsing air slots providing rinsing air flows which are directed at a selected angle with respect to said axis.
Claim 10
Dependent Claim
77 words
In a box for powder coating of a workpiece, the improvement claimed in claim 2, in which said air inlet means comprises rinsing air slots directing the rinsing air flows in a direction to impart a rotary motion to said powder cloud about said axis and which rotary motion provides a cyclone effect around the workpiece and which is comparable to the effect of known cyclones to focus the air-powder flow in the direction of said axis.
Claim 11
Dependent Claim
33 words
In a box for powder coating of a workpiece, this improvement claimed in claim 2, in which said air inlet means direct said rinsing air flows upwardly at an angle to the vertical.
Claim 12
Dependent Claim
22 words
In a box for powder coating of a workpiece, the improvement claimed in claim 2, in which said endless belt is air-permeable.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |