US4468783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for arc furnaces
Assignee: Arc Technologies Systems Ltd
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Filing: 1981-07-21
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Granted: 1984-08-28
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Expires: 2001-07-21
Abstract
Abstract Electrodes for arc furnaces comprising a top portion (5) of metal and a replaceable bottom portion (6) of material which is only slowly consumable, being substantially cylindrical shape and the portions being interconnected by means of a screw nipple (1) or the like and the top portion has a liquid cooling device with a header duct (2) and a return duct (3) and the top portion (5) is advantageously protected in the bottom region thereof by means of an insulating coating of high temperature stability representing a detachably surmountable moulding. An electrically conductive intermediate layer of high temperature stability can be provided between the insulating moulding and the top portion. The electrodes are only slightly trouble prone, have emergency operating properties, have a high mechanical stressability and are easy to repair.
Inventors
- 👤 Hanns G. Bauer
- 👤 Dieter H. Zollner
- 👤 Josef Otto
- 👤 Josef Muhlenbeck
- 👤 Friedrich Rittmann
- 👤 Claudio Conradty
- 👤 Inge Lauterbach-Dammler
- 👤 Horst Sonke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:15
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/10; H05B7/101
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
100 words
A metellurgical arc furnace having an electrode, said electrode comprising: an electrical current conducting metallic top portion and a consumable, replaceable bottom portion, a threadable interconnection between the portions; the top portion including a cooling means having a supply and return, each extending longitudinally through the top portion; the top portion including at least one insulation support; and a plurality of ring-like insulative moulding sections having an inner diameter sufficiently in excess of an outer diameter of the top portion whereby, when the furnace is in operation, the moulding section slideably surrounds at least a portion of the top portion.
Claim 2
Dependent Claim
100 words
A metellurgical arc furnace having an electrode, said electrode comprising: an electrical current conducting metallic top portion and a consumable, replaceable bottom portion, a threadable interconnection between the portions; the top portion including a cooling means having a supply and return, each extending longitudinally through the top portion; the top portion including at least one insulation support; and a plurality of ring-like insulative moulding sections having an inner diameter sufficiently in excess of an outer diameter of the top portion whereby, when the furnace is in operation, the moulding section slideably surrounds at least a portion of the top portion.
Claim 3
Dependent Claim
10 words
The electrode of claim 1 the moulding sections being tubular.
Claim 4
Dependent Claim
27 words
The electrode of claim 1, the moulding sections and external edges of the top portion not surrounded by the mouldings being substantially flush each with the other.
Claim 5
Dependent Claim
18 words
The electrode of claim 1, the insulative moulding sections being at least partially supported by the threadable interconnection.
Claim 6
Dependent Claim
34 words
The electrode of claim 1, an insulation support being provided on said top portion including an abutment, positioned adjacent the threadable interconnection, the insulative mouldings being supported upon the abutment below the upper region.
Claim 7
Dependent Claim
82 words
The electrode of claim 1, the top portion including an upper region of a relatively larger diameter and a lower region of a relatively smaller diameter, the upper region including a plurality of longitudinal bores, shafts being received one within each such bore, the shafts including a spring for biasing the shafts downwardly along the electrode, and the shafts including a portion for contacting the insulative mouldings whereby the insulative mouldings are downwardly biased along the lower region of the upper portion.
Claim 8
Dependent Claim
38 words
The electrode of any one of claims 1-6 including a plurality of ring-like intermediate sections configured to closely surround the lower region, intermediate sections being introduced between the insulative moulding and the lower region of the upper portion.
Claim 9
Dependent Claim
19 words
The electrode of claim 7, the intermediate sections being formed of a fabric material having an elevated temperature stability.
Claim 10
Dependent Claim
23 words
The electrode of claim 1, the portion of the top portion surrounded by the moulding being coated with a stressable electrically conductive coating.
Claim 11
Dependent Claim
11 words
The electrode of claim 9, the coating being a ceramic coating.
Claim 12
Dependent Claim
23 words
The electrode of claim 1, the insulative moulding section being formed from ceramic and graphite having a substantially elevated resistance to elevated temperature.
Claim 13
Dependent Claim
21 words
The electrode of claim 1, the insulative moulding comprising tubular sections formed from graphite and covered with an electrically insulative coating.
Claim 14
Dependent Claim
15 words
The electrode of claim 7, the intermediate sections being formed from an electrically conductive ceramic.
Claim 15
Dependent Claim
12 words
The electrode of claim 7, the intermediate sections being formed from graphite.
Claim 16
Dependent Claim
23 words
The electrode of claim 7, the intermediate sections being formed from a fabric including at least one of mineral fabric and ceramic materials.
Claim 17
Dependent Claim
13 words
The electrode of claim 7, the intermediate sections being formed from a felt.
Claim 18
Dependent Claim
34 words
The electrode of claim 7, including a plurality of insulative mouldings at least one such moulding and at least one intermediate section being mounted on retainers, the retainers being attached to the lower region.
Claim 19
Dependent Claim
44 words
The electrode of claim 1, the insulative moulding adjacent the top region of the upper portion being an insulating, injectible refractory compound, the upper region of the top portion including at least one retaining member to which the insulating, injectible refractory compound is anchored.
Claim 20
Dependent Claim
41 words
The electrode of claim 7, the intermediate sections and the insulative moulding being configured for slideable longitudinal movement along the top portion to effect replacement of damaged sections of such intermediate and/or insulative moulding which become detached from the lower region.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |