US3870375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder spray system
Assignee: Nordson Corp
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Filing: 1972-06-05
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Granted: 1975-03-11
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Expires: 1992-06-05
Abstract
Abstract A coating apparatus with a powder supply system for use in a device for electrostatically spraying powder material onto the surface of an article or substrate to be coated. The system includes a powder reclaiming and recycling system which pneumatically retrieves the unused powder from the spray booths and filters the powder from the air. The filter system includes plural modules, each capable of accommodating a given number of spray guns. An automatic filter shaking system releases the powder from the filters upon command by sequentially shutting down the filter modules, one at a time, while the system is in operation. An additional filter module is provided so that adequate filtering capability is maintained while the filter shaking operation proceeds. The powder released from the filters is blown from the filters to a feeder section through a sieve which mixes new powder with the reclaimed powder under automatic control which replenishes the powder supply to the feeder. The feeder employs a fluidizing bed from which (a plurality of) plural module feeders are fed. The feeders are positioned beneath the bed and draw powder through elongated standpipes for improved powder flow control. This configuration shows complete drainage of the bed and prevents ''''puffing'''' associated with conventional fluidized bed feeders. The feeders are quickly and easily detachable from the system and can be quickly and easily replaced or disassembled for cleaning when material or color change is desired.
Inventors
- 👤 Lane S Duncan
- 👤 Simon Z Tamny
- 👤 Charles H Riedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:46
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B05B7/144; B05B7/1445; B05B14/00; B05B14/40; B05B14/48; B05B5/00; B05B5/16; B05B5/1683; B05B7/1454; B05B7/1477; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
A feeder for feeding a powder-air mixture comprising: a fluidizing bed including a fluidizing chamber, a generally horizontal porous floor for said chamber and means for directing air through said floor into said chamber to fluidize powder therein; a venturi pump having at least one small diameter air inlet opening into a large diameter expansion chamber, a powder inlet and an outlet; means connecting said powder inlet of said venturi pump to said fluidizing chamber of said fluidizing bed so as to enable said venturi pump to draw powder from said fluidizing bed into said expansion chamber of said pump, said connecting means comprises an elongated vertical passage having an inlet connected to the bottom of said fluidizing bed chamber and an outlet located vertically beneath said elongated passage inlet, said elongated passage outlet being connected to said powder inlet of said venturi pump for communicaTing powder from said bed to said venturi pump expansion chamber, said connecting means comprising an elongated vertical pipe, said inlet of said elongated vertical passage being located above and out of the horizontal plane of said generally horizontal porous floor, said elongated vertical pipe being horizontally spaced and separated from said generally horizontal porous floor by a nonporous portion of said floor.
Claim 2
Dependent Claim
208 words
A feeder for feeding a powder-air mixture comprising: a fluidizing bed including a fluidizing chamber, a generally horizontal porous floor for said chamber and means for directing air through said floor into said chamber to fluidize powder therein; a venturi pump having at least one small diameter air inlet opening into a large diameter expansion chamber, a powder inlet and an outlet; means connecting said powder inlet of said venturi pump to said fluidizing chamber of said fluidizing bed so as to enable said venturi pump to draw powder from said fluidizing bed into said expansion chamber of said pump, said connecting means comprises an elongated vertical passage having an inlet connected to the bottom of said fluidizing bed chamber and an outlet located vertically beneath said elongated passage inlet, said elongated passage outlet being connected to said powder inlet of said venturi pump for communicaTing powder from said bed to said venturi pump expansion chamber, said connecting means comprising an elongated vertical pipe, said inlet of said elongated vertical passage being located above and out of the horizontal plane of said generally horizontal porous floor, said elongated vertical pipe being horizontally spaced and separated from said generally horizontal porous floor by a nonporous portion of said floor.
Claim 3
Dependent Claim
208 words
A feeder for feeding a powder-air mixture comprising: a fluidizing bed including a fluidizing chamber, a generally horizontal porous floor for said chamber and means for directing air through said floor into said chamber to fluidize powder therein; a venturi pump having at least one small diameter air inlet opening into a large diameter expansion chamber, a powder inlet and an outlet; means connecting said powder inlet of said venturi pump to said fluidizing chamber of said fluidizing bed so as to enable said venturi pump to draw powder from said fluidizing bed into said expansion chamber of said pump, said connecting means comprises an elongated vertical passage having an inlet connected to the bottom of said fluidizing bed chamber and an outlet located vertically beneath said elongated passage inlet, said elongated passage outlet being connected to said powder inlet of said venturi pump for communicaTing powder from said bed to said venturi pump expansion chamber, said connecting means comprising an elongated vertical pipe, said inlet of said elongated vertical passage being located above and out of the horizontal plane of said generally horizontal porous floor, said elongated vertical pipe being horizontally spaced and separated from said generally horizontal porous floor by a non-porous portion of said floor.
Claim 4
Dependent Claim
208 words
A feeder for feeding a powder-air mixture comprising: a fluidizing bed including a fluidizing chamber, a generally horizontal porous floor for said chamber and means for directing air through said floor into said chamber to fluidize powder therein; a venturi pump having at least one small diameter air inlet opening into a large diameter expansion chamber, a powder inlet and an outlet; means connecting said powder inlet of said venturi pump to said fluidizing chamber of said fluidizing bed so as to enable said venturi pump to draw powder from said fluidizing bed into said expansion chamber of said pump, said connecting means comprises an elongated vertical passage having an inlet connected to the bottom of said fluidizing bed chamber and an outlet located vertically beneath said elongated passage inlet, said elongated passage outlet being connected to said powder inlet of said venturi pump for communicaTing powder from said bed to said venturi pump expansion chamber, said connecting means comprising an elongated vertical pipe, said inlet of said elongated vertical passage being located above and out of the horizontal plane of said generally horizontal porous floor, said elongated vertical pipe being horizontally spaced and separated from said generally horizontal porous floor by a non-porous portion of said floor.
Claim 5
Dependent Claim
17 words
The feeder of claim 1 further comprising: a remotely controlled valve near the inlet of said passage.
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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) | 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 |