| 摘要 |
An induction heating device for inductively heating the conical surface of a valve seat in an engine block for subsequent quench hardening including a fixed multi-turn transformer primary winding having a central opening and a carrier having both the secondary of the transformer and the inductor mounted thereon wherein the carrier is selectively shiftable between a first position with the inductor spaced away from the valve seat and a second position with the inductor magnetically coupled to the valve seat and with the secondary then within the primary.
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