Patent US3828974A successfully refreshed from Google Patents.
US3828974A
Expired / Lapsed
US
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Process for the emergency interruption of the flow of melt in a gravity casting plant
Assignee: GRAVICAST PATENT GmbH
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Filing: 1973-01-11
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Granted: 1974-08-13
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Expires: 1993-01-11
Abstract
Abstract In a gravity casting plant the melt is dammed up in a supply chamber up to a level which is higher than the level of the mouth of a casting nozzle. The melt flows from the supply chamber into an oblong equalization chamber and from this into the casting nozzle, and the flow of melt when operating the casting plant under normal conditions is controlled by a valve situated between the supply chamber and the equalization chamber. To avoid undesired outflow of melt from the casting nozzle at least the melt in the region of the mouth of the casting nozzle is cooled until same melt is solidified. A cooling member having an internal cooling system is provided on the nozzle to provide for the necessary cooling thereof.
Inventors
- 👤 O Tenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:08
CPC Classifications
B; B22; B22D; B22D35/00; B22D35/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A process for the emergency interruption of the flow of melt in a gravity-type casting plant having a supply chamber, an upwardly directed casting nozzle spaced from said supply chamber and having an outlet opening, control means for controlling the flow of melt under its own weight from the supply chamber to the casting nozzle and damming up the melt in the supply chamber to a higher level than the level of the outlet opening of the casting nozzle, comprising the steps of temporarily closing the casting nozzle from above, and then forming a plug in the casting nozzle by cooling the melt at least in the region of said casting nozzle until said melt is solidified in said region and thereby interrupts the flow of melt through the casting nozzle independently of said control means and avoids undesired overflow of the melt.
Claim 2
Dependent Claim
143 words
A process for the emergency interruption of the flow of melt in a gravity-type casting plant having a supply chamber, an upwardly directed casting nozzle spaced from said supply chamber and having an outlet opening, control means for controlling the flow of melt under its own weight from the supply chamber to the casting nozzle and damming up the melt in the supply chamber to a higher level than the level of the outlet opening of the casting nozzle, comprising the steps of temporarily closing the casting nozzle from above, and then forming a plug in the casting nozzle by cooling the melt at least in the region of said casting nozzle until said melt is solidified in said region and thereby interrupts the flow of melt through the casting nozzle independently of said control means and avoids undesired overflow of the melt.
Claim 3
Dependent Claim
66 words
The process of claim 1, wherein the step of damming up the melt in the supply chamber by cooling the region of the casting nozzle comprises the placing of a cooling member on the casting nozzle and holding the cooling member on the casting nozzle until at least the melt in the region of the mouth of said casting nozzle is solidified and forms a plug.
Claim 4
Dependent Claim
45 words
The process of claim 1, wherein upwardly directed passageway means form a support for said casting nozzle and wherein the step of cooling the melt in the region of the casting nozzle includes the step of cooling the casting nozzle support around the passageway means.
Claim 5
Dependent Claim
34 words
The process of claim 1, including the step of equalizing the level between said control means and said casting nozzle by flowing the melt in the region between the control means and casting nozzle.
Claim 6
Dependent Claim
21 words
The process of claim 1, including the step of reestablishing the flow through said cooling nozzle by melting the plug therein.
References Cited (Backward Citations)
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US673556A
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US2957936A
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US3705616A
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US3682456A
Cited
US3709477A
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |