Patent US4100387A successfully refreshed from Google Patents.
US4100387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the inductive heating of workpieces especially for the heating of cam shafts
Assignee: SMS Elotherm GmbH
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Filing: 1976-08-10
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Granted: 1978-07-11
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Expires: 1996-08-10
Abstract
Abstract An apparatus for surface hardening an irregularly shaped workpiece made of hardenable material by inductive heating whereby a clamped workpiece is rotated past a linear conductor disposed along the envelope circle formed by the cam of the workpiece which extends farthest from the workpiece axis. The conductor has a plurality of yoke sheets to heat the workpiece surface uniformly.
Inventors
- 👤 Friedhelm Reinke
- 👤 Ludwig Mackenberger
- 👤 Eckhard Siefert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:28
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/365; C; C21; C21D; C21D9/00; C21D9/30; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
An apparatus for inductive heating to surface harden an eccentric workpiece made of hardenable material with extensions disposed eccentrically in relation to its longitudinal axis, said heating apparatus comprising: means for clamping said eccentric workpiece for rotation; driving means acting upon said clamping arrangement for rotating said eccentric workpiece around its longitudinal axis; and inductor means for inductive heating said eccentric workpiece, disposed at an air distance from the surface of said eccentric workpiece, and including a linear conductor disposed at a distance from the rotational axis of said eccentric workpiece running outside in the direction of the longitudinal axis of the eccentric workpiece, at least as far from said axis as the envelope cylinder surface of the eccentric workpiece, which is assigned to the eccentric extension of the greatest length.
Claim 2
Independent Claim
131 words
An apparatus for inductive heating to surface harden an eccentric workpiece made of hardenable material with extensions disposed eccentrically in relation to its longitudinal axis, said heating apparatus comprising: means for clamping said eccentric workpiece for rotation; driving means acting upon said clamping arrangement for rotating said eccentric workpiece around its longitudinal axis; and inductor means for inductive heating said eccentric workpiece, disposed at an air distance from the surface of said eccentric workpiece, and including a linear conductor disposed at a distance from the rotational axis of said eccentric workpiece running outside in the direction of the longitudinal axis of the eccentric workpiece, at least as far from said axis as the envelope cylinder surface of the eccentric workpiece, which is assigned to the eccentric extension of the greatest length.
Claim 3
Dependent Claim
46 words
An apparatus an in claim 1, further including a plurality of yoke sheets made of ferromagnetic material and attached to the back of said linear conductor, the distance of which along the longitudinal extent of the condutor being varied for controlling the heating in said workpiece.
Claim 4
Dependent Claim
48 words
An apparatus as in claim 1, including a plurality of linearly running conductors which are disposed in parallel to one another, each distributed around the rotational axis of the workpiece, outside of the envelope cylinder surface with the greatest radius, and at an angular separation from one another.
References Cited (Backward Citations)
US2785263A
Cited
GB1036725A
Cited
US3562030A
Cited
US3659069A
Cited
US3846609A
Cited
US3842234A
Cited
US3944446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |