US3850416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slag depth indicator
Assignee: Ford Motor Co
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Filing: 1974-01-04
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Granted: 1974-11-26
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Expires: 1994-01-04
Abstract
Abstract An apparatus and method for quickly determining the depth of slag in a furnace or ladle is disclosed. A pyrolytic coating is applied to a metallic lance so that upon immersion through said slag, the lance will be cleanly etched by the metal without hinderance from the slag. Determination of the depth is obtained by measuring between the top of the etched marking and an indicator which is aligned with the top of the slag layer.
Inventors
- 👤 P Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:41
CPC Classifications
F; F27; F27D; F27D21/00; F27B; F27B3/00; F27B3/08; F27B3/085; F27D21/0028
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
Apparatus for determining slag depth in a vessel, comprising: a. a lance having sufficient length to extend above, through and below the most extreme slag condition anticipated for said vessel, b. support means for controllably positioning said lance over said slag and for permitting said lance to be inserted through said slag while said support means remains above said slag, c. indicator means of said lance for permitting alignment of a predetermined location on said lance in contact with the exposed surface of said slag, and d. coating means on and along substantially the entire length of said lance, said coating being effective to pyrolyze upon contact with said molten slag.
Claim 2
Dependent Claim
111 words
Apparatus for determining slag depth in a vessel, comprising: a. a lance having sufficient length to extend above, through and below the most extreme slag condition anticipated for said vessel, b. support means for controllably positioning said lance over said slag and for permitting said lance to be inserted through said slag while said support means remains above said slag, c. indicator means of said lance for permitting alignment of a predetermined location on said lance in contact with the exposed surface of said slag, and d. coating means on and along substantially the entire length of said lance, said coating being effective to pyrolyze upon contact with said molten slag.
Claim 3
Dependent Claim
17 words
The instrument as in claim 1, in which said lance is substantially constituted of plain carbon steel.
Claim 4
Dependent Claim
32 words
The instrument as in claim 1, in which said pyrolyzible coating for said lance is comprised substantially of impregnated paper having a layer of adhesive for joining said paper to said lance.
Claim 5
Dependent Claim
27 words
The instrument as in claim 1, in which the support means has a joint for replaceably holding said lance in a direction transverse to said support means.
Claim 6
Dependent Claim
52 words
The instrument as in claim 4, in which said replaceable journal comprises a sleeve having an opening for snugly receiving said lance therethrough, said journal also having aligned openings with similar openings in said lance whereby a tapered pin may be inserted therethrough for releaseably holding said lance locked in said sleeve.
Claim 7
Independent Claim
217 words
A method for determining the depth of molten slag in a vessel, comprising: a. providing a lance of sufficient length to penetrate the intended slag layer in the furnace, said lance being provided with a pyrolytic coating substantially throughout the length of said lance and an indicator at one end of the lance, b. while releaseably supporting said lance at the end of a beam, insert said lance and beam through the furnace door with the lance and beam in a common horizontal plane, upon reaching a centralized position over said slag the beam is rotated to bring the lance into a perpendicular position so that it may be lowered to penetrate through said slag, thence lowering the lance through the slag while aligning said indicator in contact with the upper surface of the slag, c. holding said lance in said lowered position for a period of time between 5-10 seconds, d. raising said lance and rotating said lance to return to the horizontal place and thence withdrawing said lance from the furnace, and e. releasing said lance from the beam and analyzing the displaced lance to note where molten metal has etched the lance, and measuring the distance from the top of said etching point to said indicator for rendering a measurement of the slag depth.
Claim 8
Independent Claim
217 words
A method for determining the depth of molten slag in a vessel, comprising: a. providing a lance of sufficient length to penetrate the intended slag layer in the furnace, said lance being provided with a pyrolytic coating substantially throughout the length of said lance and an indicator at one end of the lance, b. while releaseably supporting said lance at the end of a beam, insert said lance and beam through the furnace door with the lance and beam in a common horizontal plane, upon reaching a centralized position over said slag the beam is rotated to bring the lance into a perpendicular position so that it may be lowered to penetrate through said slag, thence lowering the lance through the slag while aligning said indicator in contact with the upper surface of the slag, c. holding said lance in said lowered position for a period of time between 5-10 seconds, d. raising said lance and rotating said lance to return to the horizontal place and thence withdrawing said lance from the furnace, and e. releasing said lance from the beam and analyzing the displaced lance to note where molten metal has etched the lance, and measuring the distance from the top of said etching point to said indicator for rendering a measurement of the slag depth.
Claim 9
Dependent Claim
35 words
The method as in claim 6, in which the pyrolytic material is comprised of an adherent paper tape impregnated with said tape being applied to the exterior of said lance throughout substantially its entire length.
Claim 10
Dependent Claim
25 words
The method as in claim 6, in which the pyrolytic material is an organic coating selected from the group consisting of varnish, tar biTuminous paint.
References Cited (Backward Citations)
US3663204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |