US4216800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for the control of liquid metal streams
Assignee: Bpifrance Financement SA
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Filing: 1978-07-10
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Granted: 1980-08-12
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Expires: 1998-07-10
Abstract
Abstract The invention concerns the centering, the guiding and the correction of shape of liquid streams of different metals. A series of various and different electrical conductors A, B, C, D, even in number, are disposed along generatrices of a prism whose axis X coincides with the axis to be imposed on stream V. High frequency alternating currents opposite in direction are passed along two successive conductors. Application to different types of casting in particular.
Inventors
- 👤 Marcel A. Garnier
- 👤 Rene J. Moreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:34
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/01; B22D11/015; B22D35/00; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/206; Y10T137/2082; Y10T137/218; Y10T137/2191
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
164 words
A device for centering, guiding and/or imparting a circular section to an unconfined liquid metal stream by subjecting said stream to at least one high frequency multipolar rotating field for creating induced current only in the skin of said stream, the geometry of this field within said stream being such that its amplitude increases greatly from a line or zone toward said skin where it is minimal, so that the longitudinal axis of said stream aligns itself along with said line or zone controlling said stream without using physical walls comprising; a series of at least four electrical field generating means even in number, disposed generally equally along generatrices of a prism or cylinder whose axis, rectilinear or curvilinear, coincides with the longitudinal axis to be imposed on said liquid metal stream, and means for passing, at least during certain periods of time, high frequency alternating currents opposite in direction along two successive field generating means, following the periphery of said prism or cylinder.
Claim 2
Independent Claim
164 words
A device for centering, guiding and/or imparting a circular section to an unconfined liquid metal stream by subjecting said stream to at least one high frequency multipolar rotating field for creating induced current only in the skin of said stream, the geometry of this field within said stream being such that its amplitude increases greatly from a line or zone toward said skin where it is minimal, so that the longitudinal axis of said stream aligns itself along with said line or zone controlling said stream without using physical walls comprising; a series of at least four electrical field generating means even in number, disposed generally equally along generatrices of a prism or cylinder whose axis, rectilinear or curvilinear, coincides with the longitudinal axis to be imposed on said liquid metal stream, and means for passing, at least during certain periods of time, high frequency alternating currents opposite in direction along two successive field generating means, following the periphery of said prism or cylinder.
Claim 3
Dependent Claim
81 words
The device according of claim 1, comprising a second series of at least four electrical field generating means, also even in number, disposed alternately with the field generating means of the first series along generatrices of said prism or cylinder, and means for passing, at least during certain periods of time, high frequency alternating currents opposite in direction along two successive of said generating means of this second series, following the periphery of said prism or cylinder, of the second series.
Claim 4
Dependent Claim
23 words
The device according to claim 2, wherein the frequencies of the current passing along the field generating means of both series are different.
Claim 5
Dependent Claim
37 words
The device of claim 2 comprising means for alternately supplying, for periods of duration T 1 and T 2 , the field generating means of the first series and the field generating means of the second series.
Claim 6
Dependent Claim
43 words
The device according to claim 2, wherein the assembly of the field generating means of both series forms the edge of a right prism whose base is formed by a regular polygon having a number of sides which is a multiple of four.
Claim 7
Dependent Claim
34 words
The device of claim 1, wherein the first or sole series of conductors forms the edge of a right prism whose base is formed by a regular polygon having an even number of sides.
Claim 8
Dependent Claim
11 words
A device of claim 6, wherein the polygon is a square.
Claim 9
Dependent Claim
12 words
The device according to claim 6, wherein the polygon is an octagon.
Claim 10
Dependent Claim
46 words
The device according to claim 1, wherein the field generating means of one series or of the series of field generating means are formed from a single conducting element folded a number of times in hairpins between two field generating means operating successively on the periphery.
Claim 11
Dependent Claim
54 words
A device for contracting a liquid metal stream, comprising a device according to claim 1 and a tubular shield made from a good electricity conducting metal, such as copper, said shield being disposed in continuation of this latter device starting from the place where it is desired to obtain the contraction and coaxially thereto.
Claim 12
Dependent Claim
21 words
A device according to claim 10, which further comprises a second device according to claim 1 disposed about said tubular shield.
References Cited (Backward Citations)
US2686864A
Cited
FR1296410A
Cited
US3218681A
Cited
FR1576364A
Cited
US4016926A
Cited
US4033398A
Cited
US4146078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |