Patent US3700025A successfully refreshed from Google Patents.
US3700025A
Expired / Lapsed
US
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Method of casting quiet melts
Assignee: GRAVICAST PATENT GmbH
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Filing: 1971-08-30
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Granted: 1972-10-24
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Expires: 1991-08-30
Abstract
Abstract The melt to be cast is dammed up in a supply chamber so as to flow by its own weight through an equalization chamber and from the latter through a nozzle into a mold. The melt is brought to a quiet condition before it reaches the mold by interrupting the flow of the melt into the equalization chamber and after the mold has been filled, a return flow of the melt into the equalization chamber is prevented by subjecting the melt in equalization chamber and in the mold to an increased pressure and the melt in the gate cross section of mold has solidified.
Inventors
- 👤 Oscar Tenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:02
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/04; B22D39/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
Method of casting melts in which the melt is dammed up to such a level in a supply chamber that the melt flows by its own weight through an equalization chamber connected to said supply chamber and fills a casting mold connected with said equalization chamber, wherein the improvement comprises the steps of bringing the melt to a quiet condition before the melt reaches the mold by interrupting the flow of the melt into the equalization chamber, then introducing the quiet melt into the mold and after filling the mold preventing a return flow of the melt from the equalization chamber to the supply chamber, then subjecting the melt in the equalization chamber and in the mold to an increased pressure which is higher than the ferrostatic pressure acting on the melt during the filling operation of the mold.
Claim 2
Dependent Claim
139 words
Method of casting melts in which the melt is dammed up to such a level in a supply chamber that the melt flows by its own weight through an equalization chamber connected to said supply chamber and fills a casting mold connected with said equalization chamber, wherein the improvement comprises the steps of bringing the melt to a quiet condition before the melt reaches the mold by interrupting the flow of the melt into the equalization chamber, then introducing the quiet melt into the mold and after filling the mold preventing a return flow of the melt from the equalization chamber to the supply chamber, then subjecting the melt in the equalization chamber and in the mold to an increased pressure which is higher than the ferrostatic pressure acting on the melt during the filling operation of the mold.
Claim 3
Dependent Claim
40 words
Method according to claim 1 in which the melt in the equalization chamber is caused to flow during the filling of the mold along a straight passage having a constant cross section until the melt is substantially free of turbulence.
Claim 4
Dependent Claim
28 words
Method according to claim 1 including the step of maintaining said increased pressure on the melt until the melt has solidified in gate cross section of the mold.
Claim 5
Dependent Claim
20 words
Method according to claim 1, in which the raised pressure on the melt is produced mechanically inside said equalization chamber.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |