Patent ID: 7491916

Claim:
A coil head for an induction heating apparatus, said coil head comprising: (a) an outer member; (b) an inner member, said inner member having an inner side wall and an outer side wall, said inner side wall forming an opening fbr receiving a workpiece; and (c) an induction coil disposed between said inner and outer members, said induction coil comprising an electrical winding that runs substantially along said outer side wall of said inner member, wherein said induction coil is a primary source of thermal energy for heating said workpiece; further comprising: at least one external heat pipe that runs into said coil head at a location different than at said opening for the workpiece, wherein said heat pipe tends to transfer thermal energy away from said inner side wall of said inner member, and away from said opening; and wherein said heat pipe is not the primary source of thermal energy for heating the workpiece.