US3596037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for inductively heat-treating steel workpieces
Assignee: SMS Elotherm GmbH
•
Filing: 1968-02-12
•
Granted: 1971-07-27
•
Expires: 1988-02-12
Abstract
Abstract Elongate workpieces of varying diameter along their length which are to be inductively heat treated to provide both surfacehardened zones and zones toughened all the way through, have low reverse bending and torsional resistance, due to induced notch effect. It has now been discovered that if the heat treatment is carried out in two stages, one being superimposed on the other, the notch effect is diminished or eliminated.
Inventors
- 👤 Gerhard Seulln
- 👤 Friedhelm Reinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:53
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/06; C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D1/10; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
Apparatus for inductively heat treating an elongate workpiece comprising: first inductive heating means, second inductive heating means, means for moving said first and second heating means along said workpiece so as to inductively heat said workpiece, means for stopping the movement of the trailing one of said heating means relative to the other of said heating means at a given position without stopping the movement of said other of said heating means so that the adjacent region of said workpiece is heated to a greater extent than the regions adjacent the path of said other of said heating means beyond said given position.
Claim 2
Dependent Claim
103 words
Apparatus for inductively heat treating an elongate workpiece comprising: first inductive heating means, second inductive heating means, means for moving said first and second heating means along said workpiece so as to inductively heat said workpiece, means for stopping the movement of the trailing one of said heating means relative to the other of said heating means at a given position without stopping the movement of said other of said heating means so that the adjacent region of said workpiece is heated to a greater extent than the regions adjacent the path of said other of said heating means beyond said given position.
Claim 3
Dependent Claim
16 words
Apparatus as in claim 1 further including spray quenching means associated with said other heating means.
Claim 4
Dependent Claim
19 words
Apparatus as in claim 1 wherein said supplying means includes a transformer connected to each of said heating means.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |