US3786969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding-gate closure construction for bottom-pour vessels
Assignee: United States Steel Corp
•
Filing: 1972-04-17
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Granted: 1974-01-22
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Expires: 1992-04-17
Abstract
Abstract A slidable gate construction for use as a closure on a bottompour vessel, such as a ladle or tundish used for pouring liquid metal. The novel feature is that the upper face of the gate is convex when viewed in cross section. The underface of the top plate has a mating concave face.
Inventors
- 👤 C Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:57
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
In a slidable gate closure construction for controlling discharge of liquid metal from a ladle or a tundish having an outlet in its bottom wall, which construction includes a refractory top plate having an orifice aligned with said outlet, a refractory gate abutting the underside of said top plate and slidable with respect thereto to open and close said orifice, and means engaging said gate along its side edges for supporting both said top plate and said gate on the underside of a vessel, the improvement in which the upper face of said gate is convex as viewed in a cross section taken in a plane transversely of the direction of gate travel, and appears straight as viewed in a longitudinal section taken in a plane parallel with the direction of gate travel, and said top plate has a mating concave lower face, whereby forces applied to the gate along its side edges are effectively transmitted to the mid portion of the gate where the gate abuts the top plate.
Claim 2
Dependent Claim
170 words
In a slidable gate closure construction for controlling discharge of liquid metal from a ladle or a tundish having an outlet in its bottom wall, which construction includes a refractory top plate having an orifice aligned with said outlet, a refractory gate abutting the underside of said top plate and slidable with respect thereto to open and close said orifice, and means engaging said gate along its side edges for supporting both said top plate and said gate on the underside of a vessel, the improvement in which the upper face of said gate is convex as viewed in a cross section taken in a plane transversely of the direction of gate travel, and appears straight as viewed in a longitudinal section taken in a plane parallel with the direction of gate travel, and said top plate has a mating concave lower face, whereby forces applied to the gate along its side edges are effectively transmitted to the mid portion of the gate where the gate abuts the top plate.
Claim 3
Dependent Claim
31 words
An improvement as defined in claim 1 in which said coNvex and concave faces are formed on arcs of approximately equal radii in the range of about 6 to 24 inches.
Claim 4
Dependent Claim
49 words
An improvement as defined in claim 1 in which said convex and concave faces are formed on arcs, with the radius of said concave face being greater than the radius of said convex face, the radius of each arc being in the range of about 6 to 24 inches.
Claim 5
Dependent Claim
33 words
An improvement as defined in claim 1 in which said gate carries a nozzle depending from its lower face, but the lower face of said gate is essentially flat apart from said nozzle.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |