US4391860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the controlled feeding of powder material
Assignee: Eutectic Corp
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Filing: 1981-02-23
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Granted: 1983-07-05
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Expires: 2001-02-23
Abstract
Abstract The invention contemplates a powder-feeding system for gas-propelled delivery of a powder to be controllably supplied, as to a flame-spraying gas torch or to a transferred-arc plasma torch. A fluidizing chamber receives (a) fluidizing-gas flow from below a porous screen, and (b) a restricted gravitational flow of powder at a relatively small central discharge location above the porous screen. A gas conduit extends transversely through the chamber between the powder-discharge location and the porous screen; it has a carrier-gas supply connection at one end and a gas-propelled powder-delivery connection at its other end. The conduit also has an upwardly extending opening virtually beneath and facing the powder-discharge location, but a shed interposed between this opening and the powder-discharge location sufficiently overlaps the opening to assure that no powder will pass through the opening and into the conduit unless it has been gas-fluidized. The powder-discharge flow is blocked to gas flow when powder is being delivered by the carrier-gas flow, but the powder delivery is terminated promptly upon gas-venting the fluidizing chamber, via the powder-discharge flow or otherwise. A multiple-unit combination of such a system is also described wherein the proportion of different gas-fluidized powders may be selectively varied and/or coordinated to achieve various different application objectives, as in the course of a single run of a flame-spraying torch served by such combination.
Inventors
- 👤 Anthony J. Rotolico
- 👤 Eduardo Romero
- 👤 John E. Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:30
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B01; B01J; B01J8/00; B01J8/001; B01J8/0015; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/42
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
116 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, supplying different gas-fluidizable powders to the respective systems, increasing the rate of powder assimilation in carrier-gas flow through one of said systems while decreasing the rate of powder assimilation in the carrier-gas flow through the other of said systems, combining the carrier-gas flows after powder-assimilation therein, and delivering the combined flow to the torch, the same carrier-gas flow being passed through the respective systems in succession, whereby the combining step occurs at passage of the carrier-gas flow through the second system.
Claim 2
Independent Claim
116 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, supplying different gas-fluidizable powders to the respective systems, increasing the rate of powder assimilation in carrier-gas flow through one of said systems while decreasing the rate of powder assimilation in the carrier-gas flow through the other of said systems, combining the carrier-gas flows after powder-assimilation therein, and delivering the combined flow to the torch, the same carrier-gas flow being passed through the respective systems in succession, whereby the combining step occurs at passage of the carrier-gas flow through the second system.
Claim 3
Dependent Claim
13 words
The method of claim 1, in which the increasing rate commences at zero.
Claim 4
Dependent Claim
14 words
The method of claim 1, in which the decreasing rate is terminated at zero.
Claim 5
Dependent Claim
45 words
The method of claim 1, and thereafter decreasing the rate of powder assimilation in carrier-gas flow through said one system, while increasing the rate of powder assimilation in carrier-gas flow through said other system, and while continuing delivery of the combined flow to the torch.
Claim 6
Independent Claim
99 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, supplying different gas-fluidizable powders to the respective systems, varying the ratio of a powder-assimilation rate in carrier-gas flow through the respective systems, combining the carrier-gas flows after powder-assimilation therein, and delivering the combined flow to the torch, the same carrier-gas flow being passed through the respective systems in succession, whereby the combining step occurs at passage of the carrier-gas flow through the second system.
Claim 7
Independent Claim
99 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, supplying different gas-fluidizable powders to the respective systems, varying the ratio of a powder-assimilation rate in carrier-gas flow through the respective systems, combining the carrier-gas flows after powder-assimilation therein, and delivering the combined flow to the torch, the same carrier-gas flow being passed through the respective systems in succession, whereby the combining step occurs at passage of the carrier-gas flow through the second system.
Claim 8
Dependent Claim
17 words
The method of claim 5, wherein the sum of the respective powder-assimilation rates is maintained substantially constant.
Claim 9
Dependent Claim
32 words
The method of claim 1 or claim 5, in which the powder supplied to one of said systems is ceramic and the powder supplied to the other of said systems is metallic.
Claim 10
Independent Claim
126 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, providing different supplies of the same powder to the respective systems, supplying the same single flow of carrier gas to both said systems in succsssion, varying the rate of powder assimilation in said single flow at one of said systems while varying in the opposite sense the rate of powder assimilation in said single flow at the other of said systems, the variation being from zero flow at one system and to zero flow at the other system, and delivering said single flow to the torch after passage through both systems.
Claim 11
Independent Claim
126 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, providing different supplies of the same powder to the respective systems, supplying the same single flow of carrier gas to both said systems in succsssion, varying the rate of powder assimilation in said single flow at one of said systems while varying in the opposite sense the rate of powder assimilation in said single flow at the other of said systems, the variation being from zero flow at one system and to zero flow at the other system, and delivering said single flow to the torch after passage through both systems.
Claim 12
Independent Claim
85 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, supplying different gas-fluidizable powder to the respective systems, supplying the same single flow of carrier gas to both said systems in succession, varying the rate of powder assimilation in said single flow at one of said systems, and delivering said single flow to the torch after passage through both systems.
Claim 13
Independent Claim
85 words
The method of supplying powder to a powder-deposition torch, which comprises selecting two powder-fluidizing systems each having the ability to selectively control the rate of its powder assimilation in a flow of carrier gas therethrough, supplying different gas-fluidizable powder to the respective systems, supplying the same single flow of carrier gas to both said systems in succession, varying the rate of powder assimilation in said single flow at one of said systems, and delivering said single flow to the torch after passage through both systems.
Claim 14
Dependent Claim
160 words
Powder-feeding apparatus for carrier-gas delivery of a powder to be supplied to a torch or the like in loose particulate form, said apparatus comprising a carrier-gas line adapted at one end for connection to a source of carrier gas and adapted at its other end for connection to a torch or the like, and means for supplying a predetermined flow of carrier gas in said line, first and second powder-fluidizing chambers each having a fluidized-powder discharge-port connection to said line, said discharge-port connections being in succession in their connection to said line, a separate powder-supply means associated with each of the respective chambers, and a separate fluidizing-gas supply for each of said chambers, each fluidizing-gas supply being distinct and apart from the carrier-gas line and including a regulating valve connected to each of the respective chambers, whereby the setting of the respective regulator valves determines the respective rates of carrier-gas assimilation of the powders separately fluidized in the respective chambers.
Claim 15
Dependent Claim
160 words
Powder-feeding apparatus for carrier-gas delivery of a powder to be supplied to a torch or the like in loose particulate form, said apparatus comprising a carrier-gas line adapted at one end for connection to a source of carrier gas and adapted at its other end for connection to a torch or the like, and means for supplying a predetermined flow of carrier gas in said line, first and second powder-fluidizing chambers each having a fluidized-powder discharge-port connection to said line, said discharge-port connections being in succession in their connection to said line, a separate powder-supply means associated with each of the respective chambers, and a separate fluidizing-gas supply for each of said chambers, each fluidizing-gas supply being distinct and apart from the carrier-gas line and including a regulating valve connected to each of the respective chambers, whereby the setting of the respective regulator valves determines the respective rates of carrier-gas assimilation of the powders separately fluidized in the respective chambers.
Claim 16
Dependent Claim
26 words
Apparatus according to claim 10, in which control means having concurrent connection to both regulator valves is operative to maintain a predetermined relation between regulator-valve settings.
Claim 17
Dependent Claim
30 words
Apparatus according to claim 10, in which said relation is one of increasing fluidizing-gas flow to one of said chambers while decreasing fluidizing-gas flow to the other of said chambers.
Claim 18
Dependent Claim
26 words
Apparatus according to claim 11, in which said relation is selected to produce a substantially constant combined delivery rate for both fluidized powders to said line.
Claim 19
Dependent Claim
41 words
Apparatus according to claim 10, in which said line includes two branch lines for comingled delivery of separate carrier-gas flows in the respective branch lines, said first and second chambers being each associated with a different one of said branch lines.
Claim 20
Dependent Claim
24 words
Apparatus according to claim 10, in which said line is a single carrier-gas line with which said first and second chambers are each associated.
Claim 21
Dependent Claim
27 words
Apparatus according to claim 15, in which said first and second chambers are independently associated with said line in spaced succession in the direction of carrier-gas flow.
Claim 22
Dependent Claim
40 words
Apparatus according to claim 10, in which said first and second chambers are part of a larger plurality of such chambers, and in which said line is a single carrier-gas line with which each of said chambers is independently associated.
References Cited (Backward Citations)
US2571608A
Cited
US2817310A
Cited
US2919160A
Cited
US2998322A
Cited
US3020182A
Cited
US3163329A
Cited
US3220778A
Cited
US3365242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |