US4005982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-blast stove for a blast furnace
Assignee: Didier Werke AG
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Filing: 1975-09-25
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Granted: 1977-02-01
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Expires: 1995-09-25
Abstract
Abstract A shaft casing has a funnel-shaped widened upper portion connected to a cupola casing. Between the widened portion and a refractory shaft lining is a supporting frame having a platform on which a cupola lining rests. The frame is connected to the lower end of the widened portion.
Inventors
- 👤 Helmut Palz
- 👤 Rudolf Hebel
- 👤 Otto Bauersachs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:58
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/02; C21B9/04; C21B9/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
A hot-blast stove comprising: a vertically extending metallic shaft casing having therein a refractory shaft lining surrounding a combustion shaft chamber and a grating shaft, said shaft casing including a lower cylindrical section and an upper funnel-shaped widened section integrally joined to said cylindrical section and flaring upwardly and outwardly therefrom; a metallic cupola casing having a configuration of part of a sphere of a diameter greater than that of said cylindrical section, said cupola casing being integrally joined to said shaft casing at the upper end of said funnel-shaped widened section thereof, said cupola casing having therein a refractory cupola lining; an annular supporting frame positioned within and rigidly attached to said funnel-shaped widened section, said supporting frame surrounding said shaft lining and being free of direct attachment to said cylindrical section; and said supporting frame having integrally attached thereto an annular platform supporting said cupola lining.
Claim 2
Dependent Claim
148 words
A hot-blast stove comprising: a vertically extending metallic shaft casing having therein a refractory shaft lining surrounding a combustion shaft chamber and a grating shaft, said shaft casing including a lower cylindrical section and an upper funnel-shaped widened section integrally joined to said cylindrical section and flaring upwardly and outwardly therefrom; a metallic cupola casing having a configuration of part of a sphere of a diameter greater than that of said cylindrical section, said cupola casing being integrally joined to said shaft casing at the upper end of said funnel-shaped widened section thereof, said cupola casing having therein a refractory cupola lining; an annular supporting frame positioned within and rigidly attached to said funnel-shaped widened section, said supporting frame surrounding said shaft lining and being free of direct attachment to said cylindrical section; and said supporting frame having integrally attached thereto an annular platform supporting said cupola lining.
Claim 3
Dependent Claim
25 words
A stove as claimed in claim 1, wherein said supporting frame is positioned in an upward extension of said cylindrical section of said shaft casing.
Claim 4
Dependent Claim
38 words
A stove as claimed in claim 2, further comprising abutments circumferentially spaced around and attached to the inner surface of said funnel-shaped widened section directly above the lower end thereof, said supporting frame being supported by said abutments.
Claim 5
Dependent Claim
34 words
A stove as claimed in claim 3, wherein said supporting frame comprises a tubular member attached to and extending upwardly from said abutments, said platform comprising an annular member attached to said tubular section.
Claim 6
Dependent Claim
49 words
A stove as claimed in claim 4, wherein said supporting frame further comprises an annular flange attached to said tubular member at a position below said platform, and a plurality of reinforcing ribs spaced about said tubular member and attached thereto and to said platform and said annular flange.
Claim 7
Dependent Claim
21 words
A stove as claimed in claim 5, further comprising holes provided in at least one of said platform and tubular member.
Claim 8
Dependent Claim
29 words
A stove as claimed in claim 1, further comprising an annular space between said funnel-shaped widened section and said supporting frame, said annular space being filled with refractory material.
Claim 9
Dependent Claim
60 words
A stove as claimed in claim 1, wherein said cupola lining comprises a first, vertically extending, single thickness brickwork resting directly on said platform; a second, vertically extending, double thickness brickwork extending upwardly from said single thickness brickwork beyond the upper end of said funnel-shaped widened section into said cupola casing; and an arch-shaped brickwork above said double thickness brickwork.
Claim 10
Dependent Claim
24 words
A stove as claimed in claim 8, wherein said first and second brickworks project successively further inwardly to form steps in the upward direction.
Claim 11
Dependent Claim
14 words
A stove as claimed in claim 9, further comprising expansion joints at said steps.
Claim 12
Dependent Claim
36 words
A stove as claimed in claim 8, wherein the vertical axis of the centers of gravity of said first and second brickworks is positioned in an upward extension of said cylindrical section of said shaft casing.
Claim 13
Dependent Claim
36 words
A stove as claimed in claim 8, further comprising space between said first and second brickworks and said funnel-shaped widened section of said shaft casing and said cupola casing, said space being filled with refractory material.
References Cited (Backward Citations)
US2376099A
Cited
US2989296A
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US3241823A
Cited
US3334880A
Cited
US3416780A
Cited
US3690627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |