US4824295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder delivery system
Assignee: Nordson Corp
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Filing: 1986-03-19
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Granted: 1989-04-25
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Expires: 2006-03-19
Abstract
Abstract A method and apparatus for pumping a steady flow of powder from a powder spray gun of a powder spray system by pumping the powder from a fluidized bed feed hopper to the spray gun via a small auxiliary fluidized bed hopper located in close proximity to the powder spray gun. The apparatus comprises a primary fluidized bed hopper into which reclaimed powder is supplied from a powder spray booth via a powder filter module and a sieve. Powder from the primary feed hopper is pumped to the gun via an auxiliary and much smaller capacity auxiliary fluidized bed hopper located in relative close proximity to the spray gun.
Inventors
- 👤 John Sharpless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:08
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B05B7/1454; B05B7/1468; B05B7/1472; B05B7/1477
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
355 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, and a sieve for receiving powder from said filter module and separating said oversprayed powder from coarser particles, a primary fluidized bed hopper for receiving powder from said sieve, said primary hopper having an interior chamber adapted to receive and fluidize powder material, a primary pneumatic powder pump having an inlet port and a discharge port, said primary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage having an inlet connected via a siphon tube to said interior chamber of said primary hopper, means connecting said inlet port of said primary powder pump to a source of high pressure air, an auxiliary fluidized bed hopper having an interior chamber of substantially less capacity than said interior chamber of said primary hopper, said auxiliary fluidized bed hopper being located in close proximity to said powder spray booth, first conduit means connecting said outlet port of said primary powder pump to said interior chamber of said auxiliary hopper, at least one auxiliary pneumatic powder pump having an inlet port and a discharge port, said auxiliary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage of said auxiliary powder pump having an inlet connected via a siphon tube to said interior chamber of said auxiliary hopper, second conduit means connecting said outlet port of said auxiliary powder pump to said powder spray gun, said second conduit means being substantially shorter than said first conduit means, and means for maintaining a constant level of fluidized powder in said auxiliary hopper, said means for maintaining a constant level of fluidized powder in said auxiliary hopper comprising an overflow tube extending between said auxiliary hopper and said primary hopper, said overflow tube having an inlet spaced upwardly from the bottom of said interior chamber of said auxiliary hopper.
Claim 2
Dependent Claim
355 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, and a sieve for receiving powder from said filter module and separating said oversprayed powder from coarser particles, a primary fluidized bed hopper for receiving powder from said sieve, said primary hopper having an interior chamber adapted to receive and fluidize powder material, a primary pneumatic powder pump having an inlet port and a discharge port, said primary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage having an inlet connected via a siphon tube to said interior chamber of said primary hopper, means connecting said inlet port of said primary powder pump to a source of high pressure air, an auxiliary fluidized bed hopper having an interior chamber of substantially less capacity than said interior chamber of said primary hopper, said auxiliary fluidized bed hopper being located in close proximity to said powder spray booth, first conduit means connecting said outlet port of said primary powder pump to said interior chamber of said auxiliary hopper, at least one auxiliary pneumatic powder pump having an inlet port and a discharge port, said auxiliary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage of said auxiliary powder pump having an inlet connected via a siphon tube to said interior chamber of said auxiliary hopper, second conduit means connecting said outlet port of said auxiliary powder pump to said powder spray gun, said second conduit means being substantially shorter than said first conduit means, and means for maintaining a constant level of fluidized powder in said auxiliary hopper, said means for maintaining a constant level of fluidized powder in said auxiliary hopper comprising an overflow tube extending between said auxiliary hopper and said primary hopper, said overflow tube having an inlet spaced upwardly from the bottom of said interior chamber of said auxiliary hopper.
Claim 3
Dependent Claim
67 words
The apparatus of claim 1 which further comprises a plurality of auxiliary powder pumps and a plurality of powder spray guns, each of said auxiliary powder pumps having a powder flow passage connected via a siphon tube to the interior chamber of said auxiliary hopper, and each of said auxiliary powder pumps having an outlet port connected via conduit means to one of said powder spray guns.
Claim 4
Dependent Claim
214 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, and a sieve for receiving oversprayed powder from said filter module and separating said oversprayed powder from coarser particles, apparatus for dispensing a relatively constant flow of solid particulate powder from said powder spray gun, which apparatus comprises, means including a relatively large capacity primary hopper for receiving powder from said sieve and for fluidizing said solid particulate powder, a substantially smaller capacity auxiliary hopper, means including a relatively long conduit for supplying said powder from said primary hopper into said auxiliary hopper, means for fluidizing said powder in said auxiliary hopper, means including a relatively short conduit for supplying said solid particulate material from said auxiliary hopper to said powder spray gun, said means for supplying said powder from said primary hopper to said auxiliary hopper being operable to supply a greater quantity of solid particulate powder material to said auxiliary hopper than is supplied from said auxiliary hopper to said spray gun, and means for transporting excess powder from said auxiliary hopper to said primary hopper so as to maintain a substantially constant level of fluidized powder in sad auxiliary hopper.
Claim 5
Dependent Claim
214 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, and a sieve for receiving oversprayed powder from said filter module and separating said oversprayed powder from coarser particles, apparatus for dispensing a relatively constant flow of solid particulate powder from said powder spray gun, which apparatus comprises, means including a relatively large capacity primary hopper for receiving powder from said sieve and for fluidizing said solid particulate powder, a substantially smaller capacity auxiliary hopper, means including a relatively long conduit for supplying said powder from said primary hopper into said auxiliary hopper, means for fluidizing said powder in said auxiliary hopper, means including a relatively short conduit for supplying said solid particulate material from said auxiliary hopper to said powder spray gun, said means for supplying said powder from said primary hopper to said auxiliary hopper being operable to supply a greater quantity of solid particulate powder material to said auxiliary hopper than is supplied from said auxiliary hopper to said spray gun, and means for transporting excess powder from said auxiliary hopper to said primary hopper so as to maintain a substantially constant level of fluidized powder in sad auxiliary hopper.
Claim 6
Dependent Claim
315 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, a primary fluidized bed hopper for receiving powder from said filter module, said primary hopper having an interior chamber adapted to receive and fluidize powder material, a primary pneumatic powder pump having an inlet port and a discharge port, said primary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage having an inlet connected to said interior chamber of said primary hopper, means connecting said inlet port of said primary powder pump to a source of high pressure air, an auxiliary fluidized bed hopper having an interior chamber of substantially less capacity than said interior chamber of said primary hopper, first conduit means connecting said outlet port of said primary powder pump to said interior chamber of said auxiliary hopper, at least one auxiliary pneumatic powder pump having an inlet port and a discharge port, said auxiliary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage of said auxiliary powder pump having an inlet connected to said interior chamber of said auxiliary hopper, second conduit means connecting said outlet port of said auxiliary powder pump to said powder spray gun, said second conduit means being substantially shorter than said first conduit means, and means for maintaining a constant level of fluidized powder in said auxiliary hopper, said means for maintaining a constant level of fluidized powder in said auxiliary hopper comprising an overflow tube extending between said auxiliary hopper and said primary hopper, said overflow tube having an inlet spaced upwardly from the bottom of said interior chamber of said auxiliary hopper.
Claim 7
Dependent Claim
315 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, a primary fluidized bed hopper for receiving powder from said filter module, said primary hopper having an interior chamber adapted to receive and fluidize powder material, a primary pneumatic powder pump having an inlet port and a discharge port, said primary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage having an inlet connected to said interior chamber of said primary hopper, means connecting said inlet port of said primary powder pump to a source of high pressure air, an auxiliary fluidized bed hopper having an interior chamber of substantially less capacity than said interior chamber of said primary hopper, first conduit means connecting said outlet port of said primary powder pump to said interior chamber of said auxiliary hopper, at least one auxiliary pneumatic powder pump having an inlet port and a discharge port, said auxiliary powder pump having a low pressure venturi pumping chamber contained therein and a powder flow passage intersecting said venturi pumping chamber, said powder flow passage of said auxiliary powder pump having an inlet connected to said interior chamber of said auxiliary hopper, second conduit means connecting said outlet port of said auxiliary powder pump to said powder spray gun, said second conduit means being substantially shorter than said first conduit means, and means for maintaining a constant level of fluidized powder in said auxiliary hopper, said means for maintaining a constant level of fluidized powder in said auxiliary hopper comprising an overflow tube extending between said auxiliary hopper and said primary hopper, said overflow tube having an inlet spaced upwardly from the bottom of said interior chamber of said auxiliary hopper.
Claim 8
Dependent Claim
63 words
The apparatus of claim 4 which further comprises a plurality of auxiliary powder pumps and a plurality of powder spray guns, each of said auxiliary powder pumps having a powder flow passage connected to the interior chamber of said auxiliary hopper, and each of said auxiliary powder pumps having an outlet port connected via conduit means to one of said powder spray guns.
Claim 9
Dependent Claim
202 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, apparatus for dispensing a relatively constant flow of solid particulate powder from said powder spray gun, which apparatus comprises, means including a relatively large capacity primary hopper for receiving powder from said filter module and for fluidizing said solid particulate powder, a substantially smaller capacity auxiliary hopper, means including a pump and a relatively long conduit for supplying said powder from said primary hopper into said auxiliary hopper, means for fluidizing said powder in said auxiliary hopper, means including a pump and a relatively short conduit for supplying said solid particulate material from said auxiliary hopper to said powder spray gun, said means for supplying said powder from said primary hopper to said auxiliary hopper being operable to supply a greater quantity of solid particulate powder material to said auxiliary hopper than is supplied from said auxiliary hopper to said spray gun, and means for transporting excess powder from said auxiliary hopper to said primary hopper so as to maintain a substantially constant level of fluidized powder in said auxiliary hopper.
Claim 10
Dependent Claim
202 words
In combination, a powder spray booth, a powder spray gun for spraying solid particulate powder onto workpieces contained within said booth; a filter module for collecting oversprayed powder from said booth, apparatus for dispensing a relatively constant flow of solid particulate powder from said powder spray gun, which apparatus comprises, means including a relatively large capacity primary hopper for receiving powder from said filter module and for fluidizing said solid particulate powder, a substantially smaller capacity auxiliary hopper, means including a pump and a relatively long conduit for supplying said powder from said primary hopper into said auxiliary hopper, means for fluidizing said powder in said auxiliary hopper, means including a pump and a relatively short conduit for supplying said solid particulate material from said auxiliary hopper to said powder spray gun, said means for supplying said powder from said primary hopper to said auxiliary hopper being operable to supply a greater quantity of solid particulate powder material to said auxiliary hopper than is supplied from said auxiliary hopper to said spray gun, and means for transporting excess powder from said auxiliary hopper to said primary hopper so as to maintain a substantially constant level of fluidized powder in said auxiliary hopper.
References Cited (Backward Citations)
US1629032A
Cited
US2602707A
Cited
FR1494061A
Cited
US3733011A
Cited
DE1910487A1
Cited
US3791341A
Cited
US3746254A
Cited
US3870375A
Cited
US3847118A
Cited
GB1521800A
Cited
US4380320A
Cited
US4586854A
Cited
WO1987005832A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |