Patent US3674247A successfully refreshed from Google Patents.
US3674247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of inductively heating and quench hardening an elongated workpiece
Assignee: Park Ohio Holdings Corp
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Filing: 1970-03-27
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Granted: 1972-07-04
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Expires: 1990-03-27
Abstract
Abstract There is provided an apparatus and method for inductively heating and quench hardening a relatively long elongated workpiece wherein the workpiece is inductively heated by an inductor extending substantially the total length of the workpiece while the workpiece is rotated and a quenching head for quench hardening the rotating inductively heated workpiece over its complete length while the workpiece remains in the heating position.
Inventors
- 👤 Jack W Gillick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:24
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/667
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
208 words
In a device for inductively heating a relatively long, elongated workpiece having an elongated cylindrical portion of a given length b and a given diameter c and a central axis concentric with said surface, with the ratio of b:c being at least 10, said device comprising an inductor including two generally parallel conductors extending along said surface for generally said given length and cross-over conductors joining said parallel conductors; means for energizing said inductor; means for supporting said workpiece for rotation about said axis; and, means for rotating said workpiece about said axis while it is being heated, the improvement comprising: a quenching means for quenching said surface over said given length and as a unit, said quenching means including a quench head extending along said surface for substantially said given length, said head having a plurality of quench fluid outlet means for directing a quench fluid against said surface over said given length, and means for supporting said head with said outlet means closely spaced from said surface whereby said workpiece is quenched in its heating position wherein, said quench head includes a surface in which said outlet means are located, said head surface extending generally arcuately between said parallel conductors and spaced from said workpiece surface.
Claim 2
Dependent Claim
208 words
In a device for inductively heating a relatively long, elongated workpiece having an elongated cylindrical portion of a given length b and a given diameter c and a central axis concentric with said surface, with the ratio of b:c being at least 10, said device comprising an inductor including two generally parallel conductors extending along said surface for generally said given length and cross-over conductors joining said parallel conductors; means for energizing said inductor; means for supporting said workpiece for rotation about said axis; and, means for rotating said workpiece about said axis while it is being heated, the improvement comprising: a quenching means for quenching said surface over said given length and as a unit, said quenching means including a quench head extending along said surface for substantially said given length, said head having a plurality of quench fluid outlet means for directing a quench fluid against said surface over said given length, and means for supporting said head with said outlet means closely spaced from said surface whereby said workpiece is quenched in its heating position wherein, said quench head includes a surface in which said outlet means are located, said head surface extending generally arcuately between said parallel conductors and spaced from said workpiece surface.
Claim 3
Dependent Claim
50 words
The improvement as defined in claim 1 wherein said cross-over conductors extend between said parallel conductors in a first circumferential direction around said workpiece and said quench head extends between said parallel conductors in a second circumferential direction around said workpiece, said second direction being opposite to said first direction.
Claim 4
Dependent Claim
34 words
The improvement as defined in claim 2 including means for allowing said quench head to be shifted between a first position adjacent said workpiece surface and a second position remote from said workpiece surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |