Patent US3979031A successfully refreshed from Google Patents.
US3979031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge valve assembly for a metal ladle actuated through bottom of ladle
Assignee: Individual
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Filing: 1975-05-05
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Granted: 1976-09-07
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Expires: 1995-05-05
Abstract
Abstract A discharge valve assembly for a hot metal ladle having a discharge opening in the bottom thereof includes a heat resistant stopper positioned in the ladle for movement toward and away from the discharge opening and a vertical portion extending through the bottom of the ladle for actuating the same.
Inventors
- 👤 John A. Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:08
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
In a ladle for molten metal having a bottom wall and means in the bottom wall providing a discharge opening and a separate passageway therethrough, a valve assembly for said discharge opening and consisting of a stopper in said ladle and means positioning said stopper for vertical movement toward and away from said discharge opening, said means including a vertical portion extending through said passageway and having a sideward extension carrying said stopper in depending relation thereto and means exteriorly of said ladle for moving said vertical portion of the means positioning said stopper and a sleeve disposed in said separate passageway for sliding sealing engagement with said vertical portion of the means positioning said stopper.
Claim 2
Dependent Claim
116 words
In a ladle for molten metal having a bottom wall and means in the bottom wall providing a discharge opening and a separate passageway therethrough, a valve assembly for said discharge opening and consisting of a stopper in said ladle and means positioning said stopper for vertical movement toward and away from said discharge opening, said means including a vertical portion extending through said passageway and having a sideward extension carrying said stopper in depending relation thereto and means exteriorly of said ladle for moving said vertical portion of the means positioning said stopper and a sleeve disposed in said separate passageway for sliding sealing engagement with said vertical portion of the means positioning said stopper.
Claim 3
Dependent Claim
27 words
The ladle and valve assembly of claim 1 wherein said means providing said discharge opening and separate passageway is a nozzle block having spaced parallel openings therethrough.
Claim 4
Dependent Claim
30 words
The ladle and valve assembly of claim 1 and wherein at least said vertical portion and sideward extensions of said means positioning said stopper are metal enclosed in refractory material.
Claim 5
Dependent Claim
70 words
The ladle and valve assembly of claim 1 and wherein said stopper consists of an inverted U-shaped heat resistant body having passageways in its parallel portions and a second heat resistant body positioned thereon and attached thereto, opposed registering horizontal troughs in said bodies communicating with said passageways to provide an inverted U-shaped area for the reception of some of said stopper positioning means when said bodies are assembled thereon.
Claim 6
Dependent Claim
39 words
The ladle and valve assembly of claim 4 and wherein longitudinally extending ribs are formed on the walls of said bodies defining said passageways and troughs so as to form air circulation channels around said stopper positioning means therein.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |