Patent US4379375A successfully refreshed from Google Patents.
Patent US3921831A successfully refreshed from Google Patents.
US3921831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for distributing raw materials into blast furnace
Assignee: IHI Corp
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Filing: 1974-03-15
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Granted: 1975-11-25
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Expires: 1994-03-15
Abstract
Abstract A device for charging and distributing raw materials into a blast furnace is disclosed in which a distribution chute suspended from a rotary chute is adapted to rotate in unison with the rotary chute and to be tilted when a control rod extending through the rotary chute is vertically lifted or lowered. The pattern of distribution of raw materials may be arbitarily varied.
Inventors
- 👤 Masaoki Takahashi
- 👤 Makoto Nishinomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:31
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18; C21B7/20; F; F27; F27B; F27B1/00; F27B1/10; F27B1/20; F27D; F27D3/00; F27D3/0033; F27D3/10; F27D2003/105
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A spreader assembly for distributing raw material into the top of a blast furnace having a fixed distribution chute, comprising a rotary, cylindrical chute into which the raw material is introduced from said fixed chute, a pair of vertical partition walls disposed within the rotary chute, the side edges of the walls being fixed to the inner wall of said chute, a cover fixed to the upper edges of the pair of partition walls, said partition walls and cover defining a chamber, raw material passages defined between the pair of partition walls and the inner surface of the cylindrical chute, a distribution chute positioned below said passages, a control rod extending into said chamber and supporting said distribution chute, means in said chamber connected to said rod to control tilting and rotary movement of the distribution chute, and means to cause said control rod, distribution chute and cylindrical chute to rotate as a unit.
Claim 2
Dependent Claim
154 words
A spreader assembly for distributing raw material into the top of a blast furnace having a fixed distribution chute, comprising a rotary, cylindrical chute into which the raw material is introduced from said fixed chute, a pair of vertical partition walls disposed within the rotary chute, the side edges of the walls being fixed to the inner wall of said chute, a cover fixed to the upper edges of the pair of partition walls, said partition walls and cover defining a chamber, raw material passages defined between the pair of partition walls and the inner surface of the cylindrical chute, a distribution chute positioned below said passages, a control rod extending into said chamber and supporting said distribution chute, means in said chamber connected to said rod to control tilting and rotary movement of the distribution chute, and means to cause said control rod, distribution chute and cylindrical chute to rotate as a unit.
Claim 3
Dependent Claim
25 words
A device as defined in claim 1 wherein said distribution chute may be removed from the furnace and may be mounted again within the furnace.
Claim 4
Dependent Claim
38 words
A spreader assembly as called for in claim 1 comprising, in addition, a hopper disposed between said fixed distribution chute and said rotary chute and means to control the flow-rate of the raw materials into the rotary chute.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |