Patent US3942690A successfully refreshed from Google Patents.
US3942690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding gate with spring biased bolts for sealing
Assignee: United States Steel Corp
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Filing: 1974-10-16
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Granted: 1976-03-09
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Expires: 1994-10-16
Abstract
Abstract Disclosed is a slidable gate for controlling flow of liquid metal from a bottom pour vessel. The gate is springpressed against a top plate. The springs engage bolts, the heads of which have a large number of small projections contacting the underside of the gate, whereby less heat is transmitted from the gate to the bolts and springs, and their useful life is prolonged.
Inventors
- 👤 Leo Lohrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:48
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In a slider valve for a vessel, which valve comprises: a replaceable fixed ceramic head plate; a metal frame in which said head plate is mounted; a replaceable ceramic slidable plate beneath said head plate; a slidable frame in which said slidable plate is mounted; operating means connected with said slidable frame; and a plurality of spring-loaded bolts carried by said frame and having heads; the improvement in which the outer faces of the bolt heads carry a large number of projections which have crests located in a common plane transversely of the vessel; said projections bearing against the underside of said slidable plate, whereby said bolts urge said slidable plate against said head plate.
Claim 2
Dependent Claim
115 words
In a slider valve for a vessel, which valve comprises: a replaceable fixed ceramic head plate; a metal frame in which said head plate is mounted; a replaceable ceramic slidable plate beneath said head plate; a slidable frame in which said slidable plate is mounted; operating means connected with said slidable frame; and a plurality of spring-loaded bolts carried by said frame and having heads; the improvement in which the outer faces of the bolt heads carry a large number of projections which have crests located in a common plane transversely of the vessel; said projections bearing against the underside of said slidable plate, whereby said bolts urge said slidable plate against said head plate.
Claim 3
Dependent Claim
19 words
A valve as defined in claim 1 in which said projections are square shaped when viewed from the side.
Claim 4
Dependent Claim
22 words
A valve as defined in claim 1 in which said projections have the shape of truncated pyramids when viewed from the side.
Claim 5
Dependent Claim
23 words
A valve as defined in claim 1 in which the base dimensions of said projections are smaller than the free spacings between projections.
Claim 6
Dependent Claim
15 words
A valve as defined in claim 1 in which said projections are arranged in rows.
Claim 7
Dependent Claim
31 words
A valve as defined in claim 1 in which the planar view of the bolt heads correspond with a circle from which segments have been removed by superimposing an intersecting square.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |