Electric heating – Inductive heating – With power supply system
Reexamination Certificate
2007-08-07
2007-08-07
Van, Quang (Department: 3742)
Electric heating
Inductive heating
With power supply system
C219S662000, C219S640000
Reexamination Certificate
active
11111419
ABSTRACT:
An apparatus and process are provided for multi-frequency induction heat treatment of workpieces including gears. High frequency power is applied to an induction coil that surrounds the workpiece so that a high frequency magnetic field couples with the workpiece to inductively heat the workpiece. A C-core inductor is coupled to a coil that has low frequency power applied to it. The workpiece is inserted in a gap in the C-core inductor magnetic circuit so that it experiences low frequency Joule effect heating when the low frequency current is applied to the coil coupled with the C-core inductor. Alternatively the workpiece may be inserted around the C-core inductor when the workpiece has an opening.
REFERENCES:
patent: 4359620 (1982-11-01), Keller
patent: 4708325 (1987-11-01), Georges
patent: 4785147 (1988-11-01), Mucha et al.
patent: 5396050 (1995-03-01), Ebihara et al.
patent: 5412183 (1995-05-01), Buffenoir et al.
Loveless Don L.
Rudnev Valery I.
Inductoheat, Inc.
Post Philip O.
Van Quang
LandOfFree
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