Patent US3573337A successfully refreshed from Google Patents.
US3573337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feeding arrangement for an electric furnace having a tubular electrode
Assignee: SUDDEUTSCHE KALKSTICKSTOFFWERKE AG
•
Filing: 1969-10-08
•
Granted: 1971-04-06
•
Expires: 1989-10-08
Abstract
Abstract In an electric furnace in which particulate solid material is fed to the furnace hearth from a normally stationary feed pipe through an axially expandable and contractable conduit and through the bore of the electrode, a charging chamber is mounted between the conduit and the electrode and provided with slide valves in its feeding and discharge portions respectively. Suitable operation of the valves permits the material to be introduced into the furnace without release of significant amounts of furnace gases.
Inventors
- 👤 Ludwig Grimm
- 👤 Otto Kick
- 👤 Siegfried Starke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:29
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/18; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
174 words
In a feeding arrangement for an electric furnace including a normally stationary feed pipe having a vertically extending axis, an electrode formed with a bore axially aligned with said pipe, said electrode being mounted for axial movement, and axially expandable and contractable conduit means interposed between said pipe and said bore and connecting the same for passage of material from said pipe to said bore, the improvement which comprises: a. a chamber having a feeding portion and a discharge portion, said discharge portion being downwardly spaced from said feeding portion; b. mounting means respectively securing said discharge portion to said electrode and securing said feeding portion to said conduit means; c. first valve means movable in said feeding portion; d. second valve means movable in said discharge portion; and e. valve actuating means for moving each of said valve means between two respective positions in which the valve means open and close the associated portions of said chamber to the passage of said material from said feed pIpe to said bore through said chamber.
Claim 2
Dependent Claim
174 words
In a feeding arrangement for an electric furnace including a normally stationary feed pipe having a vertically extending axis, an electrode formed with a bore axially aligned with said pipe, said electrode being mounted for axial movement, and axially expandable and contractable conduit means interposed between said pipe and said bore and connecting the same for passage of material from said pipe to said bore, the improvement which comprises: a. a chamber having a feeding portion and a discharge portion, said discharge portion being downwardly spaced from said feeding portion; b. mounting means respectively securing said discharge portion to said electrode and securing said feeding portion to said conduit means; c. first valve means movable in said feeding portion; d. second valve means movable in said discharge portion; and e. valve actuating means for moving each of said valve means between two respective positions in which the valve means open and close the associated portions of said chamber to the passage of said material from said feed pIpe to said bore through said chamber.
Claim 3
Dependent Claim
38 words
In an arrangement as set forth in claim 1, each of said valve means including a slide valve member, and said valve actuating means including means for moving each of said slide valve members transversely of said axis.
Claim 4
Dependent Claim
84 words
In an arrangement as set forth in claim 2, actuating means including two pressure-fluid operated motors respectively associated with said slide valve members each motor including a cylinder member defining a cavity and a piston member slidable in said cavity and dividing the same into two compartments, one member of each motor being mounted on said chamber and the other member being operatively connected to the associated slide valve member, and fluid supply means for supplying fluid under pressure to each of said compartments.
Claim 5
Dependent Claim
32 words
In an arrangement as set forth in claim 3, said fluid supply means including a source of said pressure-fluid, and a conduit simultaneously connecting respective compartments of said motors to said source.
Claim 6
Dependent Claim
47 words
In an arrangement as set forth in claim 1, said expandable and contractable conduit means including two telescoping tubular members secured to said feed pipe and to said chamber respectively for relative axial movement, and sealing means sealing said tubular members to each other during said movement.
Claim 7
Dependent Claim
38 words
In an arrangement as set forth in claim 1, a source of a purging gas under positive pressure, and an injection nozzle mounted on said chamber and communicating with said source for injecting said gas into said chamber.
Claim 8
Dependent Claim
68 words
In an arrangement as set forth in claim 6, a connecting tube axially interposed between said chamber and said electrode and connecting said chamber to said bore, a source of furnace gas under pressure, said furnace gas being different from said purging gas, and another injection nozzle mounted on said connecting tube in a position to inject said furnace gas into said connecting tube in a downward direction.
Claim 9
Dependent Claim
55 words
In an arrangement as set forth in claim 1, an axially deformable tubular member interposed between said chamber and said electrode, said tubular member connecting said discharge portion to said bore, limit switch means, and switch operating means for operating said limit switch means in response to a predetermined axial deformation of said tubular member.
Claim 10
Dependent Claim
60 words
In an arrangement as set forth in claim 8, said limit switch means including two limit switches, and said switch operating means including means for operating one of said limit switches when the axial dimension of said tubular member reaches a predetermined minimum value, and for operating the other limit switch when said axial dimension reaches a predetermined maximum value.
Claim 11
Dependent Claim
28 words
In an arrangement as set forth in claim 8, a spring member operatively interposed between said chamber and said electrode for opposing axial deformation of said tubular member.
Claim 12
Dependent Claim
19 words
In an arrangement as set forth in claim 1, venting means permanently venting said feed pipe to the atmosphere.
Claim 13
Dependent Claim
47 words
In an arrangement as set forth in claim 1, the mounting means securing said discharge portion to said electrode being releasable, and balancing means upwardly biasing said chamber with a force sufficient to prevent downward movement of said chamber when the same is released from said electrode.
References Cited (Backward Citations)
US3101385A
Cited
US3198623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |