Brian Keith Marshall

US Patent:

20090020525, Jan 22, 2009

Filed:

Jul 19, 2008

Appl. No.:

12/176363

Inventors:

Don L. Loveless - Rochester MI, US
Valery I. Rudnev - Rochester Hills MI, US
Joseph M. O'Haire - Washington Township MI, US
Randall J. Minnick - Lake Orion MI, US
Brian L. Marshall - Troy MI, US

International Classification:

H05B 6/10

US Classification:

219640

Abstract:

An induction coil with inner and outer coil segments joined together by a transition segment is arranged so that the outer coil segment generally inductively heat treats an annular outer region of a workpiece positioned under the coil, the inner coil segment generally inductively heat treats an annular inner region of the workpiece, and the transition segment traverses at least a portion of the width of the overall annular region of the workpiece to be heat treated. Relative arrangement of inner, outer and transition coil segments provides for controlled induction heat treatment across the overall annular region such as the gear teeth region of an intersecting axes or non-intersecting and non-parallel axes gear.