US3792965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walking beam furnace
Assignee: TABOUGNAR AB
•
Filing: 1971-11-29
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Granted: 1974-02-19
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Expires: 1991-11-29
Abstract
Abstract A furnace of the walking beam type in which the portion of the hearth located between two walking beams can be lifted above the level assumed by the walking beams during the feeding movement in order to permit the feed of the charge to be interrupted without the necessity for stopping the feeding movement of the beams.
Inventors
- 👤 A Bengtsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:18
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/201; F27B9/202
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
A walking beam furnace, which comprises an elongated oven hearth; a pair of walking beams disposed at opposite sides of the hearth; means for periodically raising said walking beams above the plane of the hearth and advancing them when raised, thereby effecting forward feeding movement of a charge supported thereon and thereafter retracting and lowering said walking beams to the plane of the hearth; at least one portion of the hearth length located between said walking beams being vertically liftable; and means for intermittently vertically lifting said liftable portion of the hearth, during the feeding movement of said walking beams, above the level assumed by the walking beams when lifted thereby raising but not forwardly feeding charge supported on said liftable portion.
Claim 2
Dependent Claim
122 words
A walking beam furnace, which comprises an elongated oven hearth; a pair of walking beams disposed at opposite sides of the hearth; means for periodically raising said walking beams above the plane of the hearth and advancing them when raised, thereby effecting forward feeding movement of a charge supported thereon and thereafter retracting and lowering said walking beams to the plane of the hearth; at least one portion of the hearth length located between said walking beams being vertically liftable; and means for intermittently vertically lifting said liftable portion of the hearth, during the feeding movement of said walking beams, above the level assumed by the walking beams when lifted thereby raising but not forwardly feeding charge supported on said liftable portion.
Claim 3
Dependent Claim
35 words
A walking beam furnace according to claim 1, in which said lifting means is adapted to effect lifting of said hearth portion in connection with or immediately prior to the lifting of the walking beams.
References Cited (Backward Citations)
US1761199A
Cited
US2875995A
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FR1206789A
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US3373980A
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US3450394A
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US3480264A
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US3544094A
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US3565241A
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US3662876A
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US3567198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |