US3837531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for pouring liquid metal using electromagnetic pump
Assignee: Alco Industries Inc
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Filing: 1972-02-14
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Granted: 1974-09-24
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Expires: 1992-02-14
Abstract
Abstract Molten metal is poured from a receptacle through a discharge orifice at a substantially constant predetermined discharge rate. Metal is transferred from the receptacle to the orifice at a rate in excess of the predetermined discharge rate to completely cover the orifice with a predetermined head of liquid metal. Metal transferred to the orifice from the receptacle in excess of the predetermined discharge rate is returned to the receptacle so that the predetermined head is maintained substantially constant.
Inventors
- 👤 H Eickelberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:02
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/003; B22D39/006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A method of pouring liquid metal from a receptacle through a discharge orifice, comprising the steps of; transferring metal from said receptacle to said orifice to completely cover said orifice with a substantially predetermined head of liquid metal so that liquid metal flows through said orifice at a substantially constant predetermined rate proportional to said head, continuing to transfer metal from said receptacle to said orifice at a rate in excess of that required to maintain metal flowing through said orifice at said predetermined rate, and returning excess metal to said receptacle at a rate substantially equal to the transfer rate less the predetermined discharge rate, said predetermined head being maintained by returning to the receptacle metal transferred to the orifice in excess of the predetermined discharge rate.
Claim 2
Independent Claim
128 words
A method of pouring liquid metal from a receptacle through a discharge orifice, comprising the steps of; transferring metal from said receptacle to said orifice to completely cover said orifice with a substantially predetermined head of liquid metal so that liquid metal flows through said orifice at a substantially constant predetermined rate proportional to said head, continuing to transfer metal from said receptacle to said orifice at a rate in excess of that required to maintain metal flowing through said orifice at said predetermined rate, and returning excess metal to said receptacle at a rate substantially equal to the transfer rate less the predetermined discharge rate, said predetermined head being maintained by returning to the receptacle metal transferred to the orifice in excess of the predetermined discharge rate.
Claim 3
Dependent Claim
56 words
The method of claim 1 wherein said orifice includes selectively openable and closable stopper means for selectively opening and closing said orifice to flow of metal therethrough, and further including the step of opening and closing said stopper means at predetermined intervals of time for successively discharging substantially equal predetermined quantities of metal through said orifice.
Claim 4
Independent Claim
165 words
A method of pouring liquid metal from a receptacle having an upwardly inclined discharge passage terminating at a discharge orifice, comprising the steps of: moving metal from said receptacle upwardly through said discharge passage with an electromagnetic induction field at a sufficient rate to completely cover said discharge orifice with a substantially predetermined head of liquid metal, and maintaining said substantially predetermined head so that metal flows through said orifice at a substantially constant predetermined rate, said step of moving metal from said receptacle upwardly through said discharge passage being carried out at a rate in excess of that required to maintain metal flowing through said orifice at said predetermined rate so that metal in said discharge passage includes a lower level moving upwardly under influence of said induction field and an upper level moving downwardly under influence of gravity, said substantially predetermined head being maintained by having excess metal moved up said passage flow back down in said upper level under influence of gravity.
Claim 5
Independent Claim
165 words
A method of pouring liquid metal from a receptacle having an upwardly inclined discharge passage terminating at a discharge orifice, comprising the steps of: moving metal from said receptacle upwardly through said discharge passage with an electromagnetic induction field at a sufficient rate to completely cover said discharge orifice with a substantially predetermined head of liquid metal, and maintaining said substantially predetermined head so that metal flows through said orifice at a substantially constant predetermined rate, said step of moving metal from said receptacle upwardly through said discharge passage being carried out at a rate in excess of that required to maintain metal flowing through said orifice at said predetermined rate so that metal in said discharge passage includes a lower level moving upwardly under influence of said induction field and an upper level moving downwardly under influence of gravity, said substantially predetermined head being maintained by having excess metal moved up said passage flow back down in said upper level under influence of gravity.
Claim 6
Dependent Claim
36 words
The method of claim 3, and further including the step of alternately energizing and de-energizing said induction field at predetermined intervals of time for successively discharging substantially equal predetermined quantities of metal through said discharge orifice.
Claim 7
Dependent Claim
58 words
The method of claim 3, wherein said discharge orifice includes selectively openable and closable stopper means for selectively opening and closing said orifice to flow of metal therethrough, and further including the step of opening and closing said stopper means at predetermined intervals of time for successively discharging substantially equal predetermined quantities of metal through said discharge orifice.
References Cited (Backward Citations)
FR969953A
Cited
US3610600A
Cited
US3554670A
Cited
US3612720A
Cited
DE2061168A1
Cited
US3713639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |