US3696858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for casting metered quantities of liquid metals
Assignee: SMS Elotherm GmbH
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Filing: 1969-05-02
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Granted: 1972-10-10
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Expires: 1989-05-02
Abstract
Abstract An improved method of using travelling field runners in which liquid metal is conveyed therein by travelling magnetic fields to moulds, die casting machines, casting belts and the like by controlling the flow of liquid metal therein from an initially relatively low rate up to a maximum and thereafter continuously reducing the rate from the maximum until a predetermined amount of metal has been poured.
Inventors
- 👤 Gerhard Seulen
- 👤 Axel Von Starck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/003; B22D39/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A method of casting metered quantities of a liquid metal from a travelling field electromagnetic conveyor trough, comprising the steps of controlling the initial pouring rate of liquid metal to the casting mould at a relatively low pouring rate, subsequently increasing the rate to a maximum, and thereafter continuously reducing the pouring rate from said maximum pouring rate until a predetermined quantity of liquid metal has been poured, said pouring rates being controlled by varying the effective intensity of the travelling field.
Claim 2
Independent Claim
82 words
A method of casting metered quantities of a liquid metal from a travelling field electromagnetic conveyor trough, comprising the steps of controlling the initial pouring rate of liquid metal to the casting mould at a relatively low pouring rate, subsequently increasing the rate to a maximum, and thereafter continuously reducing the pouring rate from said maximum pouring rate until a predetermined quantity of liquid metal has been poured, said pouring rates being controlled by varying the effective intensity of the travelling field.
Claim 3
Dependent Claim
34 words
A method as in claim 1 wherein said steps of controlling, increasing and reducing each include the step of variably controlling the voltage supplied from a source to said travelling field electromagnetic conveyor trough.
Claim 4
Dependent Claim
40 words
A method as in claim 2 wherein said step of voltage controlling includes the step of varying the reactance of at least a single variable reactance coil connecting said source to said electromagnetic conveyor trough according to a predetermined program.
Claim 5
Dependent Claim
37 words
A method as in claim 3 wherein said step of varying includes the steps of varying together the reactances of three variable reactance coils connecting a three phase source to said electromagnetic conveyor trough via a transformer.
Claim 6
Independent Claim
72 words
A method of casting metered quantities of a liquid metal from a travelling field electromagnetic conveyor trough, comprising controlling the pouring rate of liquid metal during the casting operation whereby a maximum pouring rate is provided, and thereafter continuously reducing the pouring rate from said maximum pouring rate until a predetermined quantity of liquid metal has been poured, said pouring rates being controlled by varying the effective intensity of the travelling field.
Claim 7
Independent Claim
72 words
A method of casting metered quantities of a liquid metal from a travelling field electromagnetic conveyor trough, comprising controlling the pouring rate of liquid metal during the casting operation whereby a maximum pouring rate is provided, and thereafter continuously reducing the pouring rate from said maximum pouring rate until a predetermined quantity of liquid metal has been poured, said pouring rates being controlled by varying the effective intensity of the travelling field.
Claim 8
Dependent Claim
20 words
A method according to claim 1, wherein the said maximum rate occurs during the initial pouring of the liquid metal.
Claim 9
Dependent Claim
17 words
A method according to claim 1, wherein the said maximum rate occurs subsequent to the initial pouring.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |