Patent US3767832A successfully refreshed from Google Patents.
US3767832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic electrode control
Assignee: Individual
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Filing: 1972-08-17
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Granted: 1973-10-23
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Expires: 1992-08-17
Abstract
Abstract An electrode-positioning system for electric furnaces including a first circuit which develops a signal proportional to the magnitude of voltage at the electrode, and a second circuit which develops a signal proportional to the magnitude of current flow through the electrode. Outputs of each of the two circuits are impressed upon the power supply circuit of a reversible winch motor through saturable core reactors. The relative magnitudes of the control signals govern the direction of current flow through the motor supply circuit, and the winch motor, in turn, raises or lowers the electrode through a direct mechanical coupling.
Inventors
- 👤 G Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:15
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/144; H05B7/148; H05B7/152; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
A control system for adjusting the position of an electrode comprising means for sensing an electrical potential existing at the electrode and generating a signal in response thereto; means for sensing current flow through the electrode and generating a signal in response thereto; a reversible electric motor; means responsive to rotation of the motor for moving the electrode in either of two directions; a circuit for energizing the motor including a first means for causing current to flow in a first direction in the circuit and a second means for causing electrical current to flow in the circuit in a direction opposed to the first direction; means for impressing a signal generated by the potential-sensing means on the first means; means for impressing a signal generated by the current-sensing means on the second means; said potential-sensing and generating means including an isolating transformer having a primary winding and a secondary winding, a rectifying means electrically connected to the secondary winding of the isolating transformer, and a saturable core reactor having its primary winding electrically connected to the output of the rectifying means; and said current-sensing and signal generating means including a current transformer, a rectifying means, an isolation transformer electrically connecting the current transformer to the rectifying means, and a saturable core reactor having a primary winding electrically connected to output terminals of the rectifying means.
Claim 2
Dependent Claim
226 words
A control system for adjusting the position of an electrode comprising means for sensing an electrical potential existing at the electrode and generating a signal in response thereto; means for sensing current flow through the electrode and generating a signal in response thereto; a reversible electric motor; means responsive to rotation of the motor for moving the electrode in either of two directions; a circuit for energizing the motor including a first means for causing current to flow in a first direction in the circuit and a second means for causing electrical current to flow in the circuit in a direction opposed to the first direction; means for impressing a signal generated by the potential-sensing means on the first means; means for impressing a signal generated by the current-sensing means on the second means; said potential-sensing and generating means including an isolating transformer having a primary winding and a secondary winding, a rectifying means electrically connected to the secondary winding of the isolating transformer, and a saturable core reactor having its primary winding electrically connected to the output of the rectifying means; and said current-sensing and signal generating means including a current transformer, a rectifying means, an isolation transformer electrically connecting the current transformer to the rectifying means, and a saturable core reactor having a primary winding electrically connected to output terminals of the rectifying means.
Claim 3
Dependent Claim
76 words
The electrode control system of claim 1 wherein the first means includes a first transformer and the secondary winding of the saturable core reactor of the potential-sensing and generating is in series with the primary winding of the first transformer, and wherein the second meaNs includes a second transformer and the secondary winding of the saturable core reactor of the current sending and generating means is in series with the primary winding of the second transformer.
Claim 4
Dependent Claim
41 words
The electrode control system of claim 2 wherein the first means includes rectifying means electrically connected to the secondary winding of the first transformer and wherein the second means includes rectifying means connected to the secondary windings of the second transformer.
References Cited (Backward Citations)
US3277229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |