US3562393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector circuit for consumable electrode furnace
Assignee: Allegheny Ludlum Corp
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Filing: 1969-08-21
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Granted: 1971-02-09
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Expires: 1989-08-21
Abstract
Abstract Detector circuitry for indicating progress of melting of an electrode in a consumable electrode furnace having an isolated alternating current source transformer coupled to a detector circuit which is series connected to the electrode, and signaling alarm means in an isolated circuit relationship.
Inventors
- 👤 Harold S Jackson
- 👤 Jack W Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A consumable electrode arc furnace having a crucible, a vertically reciprocal ram disposed above said crucible; a consumable electrode supported by and in electrical contact with said ram; electrical power supply connected to said ram and said crucible to establish an electrical arc between said electrode and said crucible to melt said electrode, means to vertically position said ram and electrode, detector circuit means electrically connected to said electrode at a predetermined position, signaling means disposed externally of said furnace responsive to said detector circuit means; enabling circuit means isolated electrically from said detector circuit means to establish a signal current in said detector circuit, said signal means responsive to interruption of said signal current in said detector circuit.
Claim 2
Dependent Claim
119 words
A consumable electrode arc furnace having a crucible, a vertically reciprocal ram disposed above said crucible; a consumable electrode supported by and in electrical contact with said ram; electrical power supply connected to said ram and said crucible to establish an electrical arc between said electrode and said crucible to melt said electrode, means to vertically position said ram and electrode, detector circuit means electrically connected to said electrode at a predetermined position, signaling means disposed externally of said furnace responsive to said detector circuit means; enabling circuit means isolated electrically from said detector circuit means to establish a signal current in said detector circuit, said signal means responsive to interruption of said signal current in said detector circuit.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1 including secondary power supply means connected to said signaling means in an isolated circuit relation from said detector circuit.
Claim 4
Dependent Claim
55 words
Apparatus according to claim 2 wherein said first isolated power supply means is AC and is connected in series with the primary of an impedance coupler, and the energizing coil of an AC relay and said detector circuit includes the secondary of said impedance coupler and said signaling means is responsive to said AC relay.
Claim 5
Dependent Claim
21 words
Apparatus according to claim 3 wherein said detector circuit includes an impedance to protect said circuit from being inadvertently short circuited.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 4 wherein said detector circuit includes enabling means to energize said AC relay energizing coil and said impedance coupler is a stepdown transformer.
Claim 7
Dependent Claim
65 words
Apparatus according to claim 5 wherein said enabling means includes normally open AC relay contacts operable by said relay energizing coil in parallel with switching means in series with said detector circuit whereby closing of said switching means causes said transformer secondary winding to reflect low impedance into said transformer primary winding to establish a holding current through the energizing coil of said AC relay.
Claim 8
Dependent Claim
20 words
Apparatus according to claim 6 including a plurality of detector circuits, each having isolated power supply means and signaling means.
Claim 9
Dependent Claim
16 words
Apparatus according to claim 6 including detector circuit means connected between predetermined points on said ram.
Claim 10
Dependent Claim
20 words
Apparatus according to claim 8 wherein said signaling means includes visual and audio alarm means responsive to said detector circuit.
References Cited (Backward Citations)
US3187159A
Cited
US3495018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |