Patent US3756172A successfully refreshed from Google Patents.
US3756172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace roof construction
Assignee: STEETLY Ltd GB
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Filing: 1971-12-17
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Granted: 1973-09-04
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Expires: 1991-12-17
Abstract
Abstract At least one element is hinged to a retaining ring that supports the roof of an electric arc furnace, and is movable from an operative position over the roof to an inoperative position free of the roof. The individual bricks comprising the roof can be held up and/or held down by the hinged element when such is in its operative position, and means are provided for removably fixing the hinged element in its operative position.
Inventors
- 👤 R Brereton
- 👤 T Lythe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:52
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/18; F27D1/1808; F27D1/1816; F27B; F27B3/00; F27B3/10; F27B3/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
In an electric arc furnace, a roof comprised of a plurality of bricks arranged in a pattern, and a superstructure adapted for holding up and/or holding down at least a part of said bricks, said furnace including a roof retaining ring upon which the outer, lower portion of said roof rests, and said superstructure including: at least one superstructure element hinged at one end thereof to said retaining ring, whereby said element is pivotally movable from an operative position lying over said roof, to an inoperative position wherein said element is free of said roof to provide access to bricks lying thereunder when said element is in its operative position, said element when in said operative position having means for holding up and/or holding down at least some of the bricks lying thereunder; and releasable means engageable with said element, and operable for fixing said element in said operative position.
Claim 2
Dependent Claim
150 words
In an electric arc furnace, a roof comprised of a plurality of bricks arranged in a pattern, and a superstructure adapted for holding up and/or holding down at least a part of said bricks, said furnace including a roof retaining ring upon which the outer, lower portion of said roof rests, and said superstructure including: at least one superstructure element hinged at one end thereof to said retaining ring, whereby said element is pivotally movable from an operative position lying over said roof, to an inoperative position wherein said element is free of said roof to provide access to bricks lying thereunder when said element is in its operative position, said element when in said operative position having means for holding up and/or holding down at least some of the bricks lying thereunder; and releasable means engageable with said element, and operable for fixing said element in said operative position.
Claim 3
Dependent Claim
42 words
In an electric arc furnace as recited in claim 1, wherein said element comprises: at least two spaced, substantially concentric arc-shaped members, connected by at least one transverse member, said transverse member being hinged at its outer end to said retaining ring.
Claim 4
Dependent Claim
52 words
In an electric arc furnace as recited in claim 2, wherein said bricks are arranged in concentric rings to form said roof, the bricks in at least some of said rings underlying said element when said element is in said operative position thereof being suspended from said arc-shaped members of said element.
Claim 5
Dependent Claim
25 words
In an electric arc furnace as recited in claim 3, wherein the bricks in others of said rings are held down by said arc-shaped members.
Claim 6
Dependent Claim
53 words
In an electric arc furance as rEcited in claim 2, wherein said bricks are arranged in concentric rings to form said roof, the bricks in at least some of said rings underlying said element when said element is in said operative position thereof being held down by said arc-shaped members of said element.
Claim 7
Dependent Claim
64 words
In an electric arc furnace as recited in claim 1, wherein a plurality of said elements are employed, said elements being arc shaped, and when taken together in their operative positions forming an annular array disposed over said roof, and said means for fixing said elements in their operative positions comprising removable fasteners interconnecting adjacent portions of said elements near the inner ends thereof.
Claim 8
Dependent Claim
51 words
In an electric arc furnace as recited in claim 1, wherein said means for fixing said element in its operative position includes: a structural member supported over the central portion of said roof; and removable fastener means adapted to secure the inner end of said element to said supported structural member.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |