US4459451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction hardening apparatus and process for the use thereof
Assignee: MASCHINENFABABRIK ALFING DESSLER GmbH
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Filing: 1981-11-19
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Granted: 1984-07-10
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Expires: 2001-11-19
Abstract
Abstract An inductor for heating rotating metal workpieces, especially for surface hardening the running surfaces, transition radii and shoulders of camshafts to different depths, has two or more heating regions which can be brought into the required heating position by changing the direction of rotation of the workpieces and, when the inductor has more than two heating regions, by using a movable abutment. When the inductor has two heating regions, then change from one region to another is achieved by simply changing the direction of workpiece rotation so that friction causes the inductor to be displaced. When the inductor has, for example, three heating regions (13, 14, 15), then an abutment (11) is used to control the inductor displacement. For more rapid displacement of the inductor or for cases where the workpiece is stationary, an external pusher device may be used.
Inventors
- 👤 Paul Regele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40; C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D1/10; C21D9/00; C21D9/30; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
Apparatus for hardening of a workpiece by induction heating, comprising: means for rotating a workpiece, such as a crankshaft, about its longitudinal axis, a heating area having heating area ends, induction heating means in said heating area disposed above a bearing surface of said workpiece and including at least two series connected inductors extending normal to said axis and partially encircling said bearing surface, means mounting said induction heating means for movements vertically and horizontally across said axis to locate a selected one of the inductors in opposed relation to said bearing surface of said workpiece, lug cams at the outer part of the heating area to keep the heating area of the workpiece in its position during turning of said workpiece, an electrical source and a source of cooling medium, means connecting said electrical source to said inductor for conducting heating current therethrough and means connecting said inductor to said source for cooling medium, said induction heating means being movable to position said selected one of the inductors over said bearing in dependence on the direction of rotation of said workpiece.
Claim 2
Dependent Claim
182 words
Apparatus for hardening of a workpiece by induction heating, comprising: means for rotating a workpiece, such as a crankshaft, about its longitudinal axis, a heating area having heating area ends, induction heating means in said heating area disposed above a bearing surface of said workpiece and including at least two series connected inductors extending normal to said axis and partially encircling said bearing surface, means mounting said induction heating means for movements vertically and horizontally across said axis to locate a selected one of the inductors in opposed relation to said bearing surface of said workpiece, lug cams at the outer part of the heating area to keep the heating area of the workpiece in its position during turning of said workpiece, an electrical source and a source of cooling medium, means connecting said electrical source to said inductor for conducting heating current therethrough and means connecting said inductor to said source for cooling medium, said induction heating means being movable to position said selected one of the inductors over said bearing in dependence on the direction of rotation of said workpiece.
Claim 3
Dependent Claim
40 words
Apparatus according to claim 1 wherein the induction heating means includes at least three inductors and also including a movable stop member for stopping said movable induction heating means to position said selected one of the inductors opposite said bearing.
Claim 4
Dependent Claim
23 words
Apparatus for hardening of a workpiece by induction heating as set forth in claim 1 wherein said heating area includes plural heating regions.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |