Patent US3687007A successfully refreshed from Google Patents.
US3687007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for machining blast furnace hopper ring in place on the furnace
Assignee: United States Steel Corp
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Filing: 1970-10-06
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Granted: 1972-08-29
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Expires: 1990-10-06
Abstract
Abstract Portable machining apparatus to be mounted in the top of a blast furnace for milling a level surface on a blast furnace hopper ring to enable a gas-tight seal to be formed between the blast furnace stack and the large bell hopper. This prevents flue gas and entrained solids from escaping into the atmosphere. The apparatus includes means for moving the cutting head circumferentially, radially, vertically and horizontally.
Inventors
- 👤 Leonard F Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:21
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/34; B23Q5/38; B23Q5/385; B23Q9/00; B23Q9/0014; B23Q9/0021; Y; Y10; Y10T; Y10T408/00; Y10T408/55; Y10T408/557; Y10T408/91; Y10T408/93; Y10T408/935; Y10T409/00; Y10T409/30; Y10T409/306216; Y10T409/306384; Y10T409/30644
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A milling machine comprising: a base having an upstanding boss centered thereon; a support plate journaled on said boss; at least one bearing member between said base and said support plate radially spaced from said boss for supporting the entire support plate weight directly on said base; radial ways carried by said support plate; a carriage mounted on said ways; means connected to said support plate and said carriage for moving said carriage radially; a cutter assembly mounted on said carriage and having a cutting head; means supported by said carriage for rotating said cutting head; means supported by said carriage for moving said cutting head vertically; means supported by said carriage for moving said cutting head tangentially; and means connected to said support plate for moving said cutter assembly arcuately.
Claim 2
Dependent Claim
131 words
A milling machine comprising: a base having an upstanding boss centered thereon; a support plate journaled on said boss; at least one bearing member between said base and said support plate radially spaced from said boss for supporting the entire support plate weight directly on said base; radial ways carried by said support plate; a carriage mounted on said ways; means connected to said support plate and said carriage for moving said carriage radially; a cutter assembly mounted on said carriage and having a cutting head; means supported by said carriage for rotating said cutting head; means supported by said carriage for moving said cutting head vertically; means supported by said carriage for moving said cutting head tangentially; and means connected to said support plate for moving said cutter assembly arcuately.
Claim 3
Dependent Claim
64 words
Apparatus as defined in claim 1, in which said means for moving said carriage radially comprises: a pillow block fixed to said support plate; a pedestal fixed to said carriage and having a threaded hole therethrough; an adjusting screw journaled in said pillow block and threadedly engaged with said pedestal; and means for rotating said screw to move said carriage radially along said ways.
Claim 4
Dependent Claim
26 words
Apparatus as defined in claim 1 in which said means for rotating said cutting head comprises a variable speed drive motor mounted on said cutter assembly.
Claim 5
Dependent Claim
68 words
Apparatus as defined in claim 1 in which said means for moving said cutting head vertically comprises: drive means mounted on and horizontally movable with respect to said carriage; a drive nut fixed to said cutter assembly; and a vertically mounted drive screw depending from said drive means and threadedly engaged with said drive nut, whereby rotation of said drive screw causes vertical movement of said cutter assembly.
Claim 6
Dependent Claim
63 words
Apparatus as defined in claim 1 in which said means for moving said cutter assembly arcuately comprises: a gear fixed to and concentric with said base; a pinion gear meshed with said first-named gear and having a shaft; and means connected to said support plate and said pinion gear shaft for rotating said pinion gear in both a clockwise and a counterclockwise direction.
Claim 7
Dependent Claim
16 words
Apparatus as defined in claim 1 including means attached to said base for leveling said base.
Claim 8
Dependent Claim
66 words
Apparatus as defined in claim 1 in which said means for moving said cutter tangentially comprises: drive means supported by said cutter assembly; a horizontal drive screw journaled on said carriage, and connected to said drive means; and a drive nut fixed to said cutter assembly and threadedly engaged with said drive screw, whereby rotation of said drive screw causes tangential movement of said cutter assembly.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |