Patent US5271033A successfully refreshed from Google Patents.
US5271033A
Expired / Lapsed
US
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Induction furnace for melting and casting substances in a nonreactive atmosphere
Assignee: ALD Vacuum Technologies GmbH
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Filing: 1992-08-11
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Granted: 1993-12-14
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Expires: 2012-08-11
Abstract
Abstract A furnace chamber contains a chassis to which a closure plate for said chamber is removably fixed. A tilting frame is borne by said chassis in a pair of coaxial tilting bearings, one of which incorporates a rotary lead through for power lines and cooling lines to an induction coil surrounding a crucible on the tilting frame. The chassis includes a pair of rails which are movable horizontally on wheels mounted to the floor of the furnace chamber.
Inventors
- 👤 Daniel Bethge
- 👤 Alfred Henn
- 👤 Michael Schaefer
- 👤 Hans-Johann Kemmer
- 👤 Otto Stenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:01
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/06; F27B14/061; F27B14/04; H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24; H05B6/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
Induction furnace for melting and casting substances in a non-reactive atmosphere, said furnace comprising a furnace chamber having a floor and a wall with a vertical opening therein, a closure plate associated with said opening so that said chamber is vacuum tight, a chassis to which said closure plate is fixed, said chassis being movable linearly through said opening, a tilting frame borne by said chassis in a pair of tilting bearings which are coaxial to a horizontal tilting axis, and a crucible borne by said tilting frame, said crucible having a pouring spout along said axis between said bearings.
Claim 2
Dependent Claim
100 words
Induction furnace for melting and casting substances in a non-reactive atmosphere, said furnace comprising a furnace chamber having a floor and a wall with a vertical opening therein, a closure plate associated with said opening so that said chamber is vacuum tight, a chassis to which said closure plate is fixed, said chassis being movable linearly through said opening, a tilting frame borne by said chassis in a pair of tilting bearings which are coaxial to a horizontal tilting axis, and a crucible borne by said tilting frame, said crucible having a pouring spout along said axis between said bearings.
Claim 3
Dependent Claim
37 words
Induction furnace as in claim 1 further comprising a pair of horizontal first rails and a plurality of first wheels associated with said rails so that said chassis is movable horizontally with respect to said furnace chamber.
Claim 4
Dependent Claim
24 words
Induction furnace as in claim 2 wherein said first rails are fixed with respect to said chassis, said wheels being mounted on said floor.
Claim 5
Dependent Claim
33 words
Induction furnace as in claim 3 further comprising a pair of second rials external to said chamber and fixed relative to said floor, and a plurality of second wheels mounted to said chassis.
Claim 6
Dependent Claim
54 words
Induction furnace as in claim 1 further comprising an induction coil surrounding said crucible, power lines carrying current for said coil, cooling water lines for said induction coil, and a rotary lead through for said power lines and said cooling water lines, said rotary lead through being incorporated in one of said tilting bearings.
Claim 7
Dependent Claim
59 words
Induction furnace as in claim 5 wherein said rotary lead through comprises a hollow cylindrical bearing body having an end facing the crucible and an opposed end, a plate of insulating materials closing said end, gland packings in said plate for bringing said lines through said plate, and a sprocket on said opposed end for engaging a tilting drive.
Claim 8
Dependent Claim
24 words
Induction furnace as in claim 1 wherein said crucible is mounted for rotation with respect to said tiling frame about a central vertical axis.
Claim 9
Dependent Claim
26 words
Inductive furnace as in claim 7 further comprising an air cushion bearing in said tilting frame, said central vertical axis passing through said air cushion bearing.
Claim 10
Dependent Claim
16 words
Inductive furnace as in claim 1 wherein said chassis is movable only in a fixed direction.
Claim 11
Dependent Claim
17 words
Induction furnace as in claim 9 wherein said fixed direction is parallel to said horizontal tilting axis.
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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) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |