US3604882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control device for an inductor
Assignee: Park Ohio Holdings Corp
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Filing: 1970-07-24
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Granted: 1971-09-14
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Expires: 1990-07-24
Abstract
Abstract A sensing coil is placed in advance of an inductor used to inductively heat an elongated workpiece and a low-level voltage below the heating voltage, is maintained on the inductor. As the workpiece passes through the sensing coil into the energized inductor, an induced voltage is created within the sensing coil. This induced voltage is used to increase the voltage across the inductor to the induction heating level. As the workpiece exits from the sensing coil, the voltage across the inductor is decreased again to its low level.
Inventors
- 👤 Richard F Seyfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:30
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
In a device for inductively heating an elongated workpiece having a length L, said device comprising an inductor having an internal passageway with an entrant end, means for feeding said elongated workpiece along a feed line extending through said passageway, and power means for energizing said inductor with a high-frequency induction heating current, the improvement comprising: a multiturn sensing coil having an opening therethrough, said opening being aligned with said passageway and said sensing coil surrounding said feed line, said sensing coil being spaced from said entrant end a distance a, substantially less than length L; means for detecting an increase in voltage induced into said sensing coil when said workpiece approaches said inductor; means for maintaining a low voltage on said inductor; first responsive means responsive to said detecting means for increasing the voltage applied to said inductor to a heating level, when said iNduced voltage exceeds a first preset amount, and second responsive means, responsive to said detecting means, for decreasing the voltage to said inductor to said low voltage when said induced voltage decreases below a second preset amount.
Claim 2
Dependent Claim
182 words
In a device for inductively heating an elongated workpiece having a length L, said device comprising an inductor having an internal passageway with an entrant end, means for feeding said elongated workpiece along a feed line extending through said passageway, and power means for energizing said inductor with a high-frequency induction heating current, the improvement comprising: a multiturn sensing coil having an opening therethrough, said opening being aligned with said passageway and said sensing coil surrounding said feed line, said sensing coil being spaced from said entrant end a distance a, substantially less than length L; means for detecting an increase in voltage induced into said sensing coil when said workpiece approaches said inductor; means for maintaining a low voltage on said inductor; first responsive means responsive to said detecting means for increasing the voltage applied to said inductor to a heating level, when said iNduced voltage exceeds a first preset amount, and second responsive means, responsive to said detecting means, for decreasing the voltage to said inductor to said low voltage when said induced voltage decreases below a second preset amount.
Claim 3
Dependent Claim
34 words
The improvement as defined in claim 1 including a means for delaying for a selected time said decrease of said voltage on said inductor when said induced voltage decreases below said second preset amount.
Claim 4
Dependent Claim
18 words
The improvement as defined in claim 1 including means for adjusting said time delay of said delaying means.
Claim 5
Dependent Claim
19 words
The improvement as defined in claim 1 including means for adjusting the response time of said first responsive means.
Claim 6
Dependent Claim
19 words
The improvement as defined in claim 1 including means for adjusting the response time of said second responsive means.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |