Patent US4435815A successfully refreshed from Google Patents.
US4435815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for charging a furnace
Assignee: Elkem ASA
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Filing: 1982-04-14
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Granted: 1984-03-06
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Expires: 2002-04-14
Abstract
Abstract The invention relates to a method and apparatus for charging an electric smelting or reduction furnace. In accordance with the invention, a charge tube movable within the roof or smoke hood of the furnace and is normally held in a protected position therein. When charging of the furnace is desired, the charge tube is lowered into the furnace to serve as a means for channeling charge material into the furnace. Preferably, the charge tube is operative to accumulate charge material while in its protected position and to release the material as it is lowered toward the furnace pot.
Inventors
- 👤 Knut Evensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:07
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/0025; F27D3/0032
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
In a covered smelting furnace, an apparatus for supplying charge to the furnace through the cover, said apparatus comprising: (a) a charging tube having an upper section and a lower section slidable with respect to each other, said charging tube being disposed in the cover of the smelting furnace; (b) the lower section being slidable between a first position in which it extends through the cover into the interior of the furnace to enable discharge of material and a second position in which it is withdrawn into the cover of the furnace while the furnace is in operation.
Claim 2
Dependent Claim
98 words
In a covered smelting furnace, an apparatus for supplying charge to the furnace through the cover, said apparatus comprising: (a) a charging tube having an upper section and a lower section slidable with respect to each other, said charging tube being disposed in the cover of the smelting furnace; (b) the lower section being slidable between a first position in which it extends through the cover into the interior of the furnace to enable discharge of material and a second position in which it is withdrawn into the cover of the furnace while the furnace is in operation.
Claim 3
Dependent Claim
21 words
The covered smelting furnace of claim 1 wherein the furnace is an open furnace and the cover is a smoke hood.
Claim 4
Dependent Claim
21 words
The covered smelting furnace of claim 1 wherein the furnace is a closed furnace and the cover is the furnace roof.
Claim 5
Dependent Claim
30 words
The apparatus of claim 1 wherein the said lower section has a closed bottom and has an opening in the side of its bottom portion for discharge of charging material.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4 wherein the charging tube is rotatable with respect to said furnace pot.
Claim 7
Dependent Claim
36 words
The apparatus of claim 4 wherein the lower end of the charging tube has a transverse surface for deflecting charge from the tube through an opening in the side of the lower end of said tube.
Claim 8
Dependent Claim
18 words
The apparatus of claim 1 wherein the lower section is concentric with and slideable on said upper section.
Claim 9
Dependent Claim
23 words
The apparatus of claim 6 further comprising means for sealing said opening when said at least said lower section withdrawn into the cover.
Claim 10
Dependent Claim
54 words
The apparatus of claim 8 wherein the furnace is an open furnace having a smoke hood disposed above said furnace pot and said lower section is movable within said smoke hood, said means for sealing said opening being disposed in said smoke hood for sealing said opening when said lower section is positioned therein.
Claim 11
Dependent Claim
16 words
The apparatus of claim 1 further comprising means for measuring the travel of said lower portion.
Claim 12
Independent Claim
116 words
A method for batchwise charging a furnace pot through a cover comprising the steps of: (a) accumulating charge material in a charging tube having an opening therein, said charging tube being withdrawn from said furnace pot for receiving said charge material, said opening being sealed when said charge tube is in said withdrawn position; (b) lowering at least a lower section of the charging tube through the cover and into the furnace pot, said opening being unsealed by the lowering of said tube thereby allowing the accumulated material to flow into the furnace pot through said opening; and (c) drawing said charge tube upwardly to its withdrawn position for receiving a subsequent batch of charge material.
Claim 13
Independent Claim
116 words
A method for batchwise charging a furnace pot through a cover comprising the steps of: (a) accumulating charge material in a charging tube having an opening therein, said charging tube being withdrawn from said furnace pot for receiving said charge material, said opening being sealed when said charge tube is in said withdrawn position; (b) lowering at least a lower section of the charging tube through the cover and into the furnace pot, said opening being unsealed by the lowering of said tube thereby allowing the accumulated material to flow into the furnace pot through said opening; and (c) drawing said charge tube upwardly to its withdrawn position for receiving a subsequent batch of charge material.
Claim 14
Dependent Claim
34 words
The method of claim 11 wherein the step of lowering the lower portion of said charging tube includes dropping said lower section for initiating a downward motion of the accumulated charge in the tube.
Claim 15
Dependent Claim
34 words
The method of claim 11 further comprising the step of rotating the charge tube to a second position before lowering said lower section to vary the direction of an opening in said charge tube.
References Cited (Backward Citations)
US3835232A
Cited
US3945515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |