US3799445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical remote-controlled refractory gunning apparatus
Assignee: Pfizer Inc
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Filing: 1973-04-30
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Granted: 1974-03-26
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Expires: 1993-04-30
Abstract
Abstract A vertical gunning conduit having a horizontal nozzle at its lower end is supported from a hoist above and extends into the open top of a refractory-lined vessel, such as an electric steelmaking furnace, with the nozzle positioned within the vessel. Refractory materials and water are supplied to the top of the conduit through a mixing head, which is connected by a swivel coupling to the lower portion of the conduit which is rotatable about its axis. An oscillating drive provided by a crank and slotted lever, is connected to the rotatable conduit through a magnetic clutch which is actuable to engage at a variable angle to control the position of the nozzle, either motionless for filling large holes, or in an oscillating path for gunning a selected portion of the vessel wall.
Inventors
- 👤 J Marino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:46
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1636; F27D1/1642; B; B05; B05B; B05B13/00; B05B13/06; B05B13/0627; B05B13/0636; B05B3/00; B05B3/14; B23; B23K; B23K9/00; B23K9/04; F27B; F27B3/00; F27B3/10; F27B3/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A vertical refractory gunning apparatus comprising a vertical gunning conduit, a control unit, bearing means rotatably connecting and mounting said vertical gunning conduit from said control unit, an oscillating drive in said control unit, a drive coupling in said control unit connecting said oscillating drive to said vertical gunning conduit supply conduits entering said control unit for supplying refractory material and water, a mixing head in said control unit to which said supply conduits are connected, a swivel coupling connecting said mixing head to said vertical gunning conduit for providing a mixture of water and refractory to said nozzle, and actuating means connected to said oscillating drive for selectively actuating it to control the angular orientation of said nozzle whereby said nozzle is angularly oriented about said vertical gunning conduit in stationary and oscillating modes of operation.
Claim 2
Dependent Claim
137 words
A vertical refractory gunning apparatus comprising a vertical gunning conduit, a control unit, bearing means rotatably connecting and mounting said vertical gunning conduit from said control unit, an oscillating drive in said control unit, a drive coupling in said control unit connecting said oscillating drive to said vertical gunning conduit supply conduits entering said control unit for supplying refractory material and water, a mixing head in said control unit to which said supply conduits are connected, a swivel coupling connecting said mixing head to said vertical gunning conduit for providing a mixture of water and refractory to said nozzle, and actuating means connected to said oscillating drive for selectively actuating it to control the angular orientation of said nozzle whereby said nozzle is angularly oriented about said vertical gunning conduit in stationary and oscillating modes of operation.
Claim 3
Dependent Claim
15 words
An apparatus as set forth in claim 1 wherein said drive coupling is a clutch.
Claim 4
Dependent Claim
19 words
An apparatus as set forth in claim 2 wherein said oscillating drive includes a crank and slotted lever linkage.
Claim 5
Dependent Claim
18 words
An apparatus as set forth in claim 3 wherein said crank comprises a rotating disc and crank pin.
Claim 6
Dependent Claim
19 words
An apparatus as set forth in claim 3 wherein said slotted lever is connected to part of said clutch.
Claim 7
Dependent Claim
24 words
An apparatus as set forth in claim 2 wherein said clutch is a magnetic clutch, and said actuating means is an electric switching device.
Claim 8
Dependent Claim
16 words
An apparatus as set forth in claim 1 wherein said oscillating drive comprises a reversible motor.
Claim 9
Dependent Claim
17 words
An apparatus as set forth in claim 7 wherein said reversible motor comprises an air driven motor.
Claim 10
Dependent Claim
18 words
An apparatus as set forth in claim 1 wherein said control unit is disposed within a control casing.
Claim 11
Dependent Claim
23 words
An apparatus as set forth in claim 1 wherein said actuating means is disposed remotely from said control unit and vertical gunning conduit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |