US3685707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding-gate closure for bottom-pour vessel
Assignee: United States Steel Corp
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Filing: 1970-05-01
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Granted: 1972-08-22
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Expires: 1990-05-01
Abstract
Abstract A sliding gate closure member for a bottom-pour hot metal vessel. The gate includes an erosion-resistant nozzle orifice insert positioned in a low-cost refractory and a hard refractory top plate that presents a crack-free surface to the molten metal, thus preventing the formation of fins. An alternative gate construction has a recessed erosion-resistant nozzle orifice insert positioned in a hard refractory that serves as both a back-up material for the orifice insert and as the top surface of the gate, yet provides similar protection against the formation of fins.
Inventors
- 👤 James T Shapland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:43
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
In the combination of a bottom-pour vessel having an outlet in its bottom wall, an orifice plate fixed to the underside of said vessel and a gate slidable on the bottom of said orifice plate, an improved gate comprising a main refractory block having an orifice, said orifice having an upwardly extending wall, and a nozzle of erosion-resistant refractory positioned within said orifice and recessed below the top of said block leaving the portion of the refractory wall of said orifice exposed above the nozzle, said block having a smooth joint-free upper surface surrounding said orifice to serve as the top of the gate, the joint between the refractories of said block and said nozzle being located within said orifice to avoid formation of fins when metal flows through said nozzle.
Claim 2
Dependent Claim
131 words
In the combination of a bottom-pour vessel having an outlet in its bottom wall, an orifice plate fixed to the underside of said vessel and a gate slidable on the bottom of said orifice plate, an improved gate comprising a main refractory block having an orifice, said orifice having an upwardly extending wall, and a nozzle of erosion-resistant refractory positioned within said orifice and recessed below the top of said block leaving the portion of the refractory wall of said orifice exposed above the nozzle, said block having a smooth joint-free upper surface surrounding said orifice to serve as the top of the gate, the joint between the refractories of said block and said nozzle being located within said orifice to avoid formation of fins when metal flows through said nozzle.
Claim 3
Dependent Claim
15 words
A gate as defined in claim 1 further comprising a metal frame surrounding said gate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |