Patent US3755644A successfully refreshed from Google Patents.
US3755644A
Expired / Lapsed
US
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High frequency induction heating apparatus
Assignee: Growth International Inc
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Filing: 1972-06-27
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Granted: 1973-08-28
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Expires: 1992-06-27
Abstract
Abstract An apparatus for high frequency induction heating of elongated workpieces wherein the induction heating inductor is mounted as an integral part of the transformer secondary portion. The transformer secondary is comprised of one or more spaced apart disc members having the inductor, which defines a desired workpiece heating pass, disposed therein and extending therebetween. The transformer secondary portion is releasably retained between a pair of spaced apart transformer primary pancake coils with one of the coils positioned in a magnetic coupling relationship with each of the disc members. The transformer secondary portion is easily removable from its magnetic coupling relationship with the transformer primary so as to permit selective use of other secondary portions which include inductors defining different sized workpiece passes.
Inventors
- 👤 J Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:48
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/101; H05B6/103; H05B6/104
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A high frequency induction heating apparatus comprising: an induction heating inductor having a workpiece encircling portion with a central workpiece receiving passage moving along a given path, and a slot intersecting said passage and generally radially extending from said path and defining opposite ends of said inductor; a transformer secondary plate secured to said inductor in a plane generally perpendicular to said path and coextensive with said inductor between said ends, said plate having at least one generally flat surface in a plane generally perpendicular to said path, an inner peripheral surface engaging said inductor, an outer peripheral surface and a slot aligned with said inductor slot and extending between said peripheral surface; a generally flat spiral pancake-tyPe primary coil having a central opening surrounding said path, positioned parallel to said flat surface and magnetically coupled thereto; and, means for connecting said primary coil to a source of high frequency current.
Claim 2
Dependent Claim
151 words
A high frequency induction heating apparatus comprising: an induction heating inductor having a workpiece encircling portion with a central workpiece receiving passage moving along a given path, and a slot intersecting said passage and generally radially extending from said path and defining opposite ends of said inductor; a transformer secondary plate secured to said inductor in a plane generally perpendicular to said path and coextensive with said inductor between said ends, said plate having at least one generally flat surface in a plane generally perpendicular to said path, an inner peripheral surface engaging said inductor, an outer peripheral surface and a slot aligned with said inductor slot and extending between said peripheral surface; a generally flat spiral pancake-tyPe primary coil having a central opening surrounding said path, positioned parallel to said flat surface and magnetically coupled thereto; and, means for connecting said primary coil to a source of high frequency current.
Claim 3
Dependent Claim
86 words
A high frequency induction heating device as defined in claim 1 wherein said secondary plate includes two generally parallel discs with one of said discs having a surface forming a generally flat surface and the other of said disc having a generally flat surface generally perpendicular to said path and a second generally flat spiral pancake-type primary coil positioned parallel to said flat surface of said other disc and magnetically coupled therewith, said means for connecting said second primary coil to said high frequency power source.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |