Induction heating system

Claim 1

A U-shaped induction heating core for use in activating adhesive in a heat activable adhesive fastener member, such as a stud with an adhesive carrying base extending generally 90* to the axis of the stud, the core including a pair of parallel legs interconnected by a bridge section extending substantially perpendicular to the legs, the bridge section and legs having substantially rectangular cross-sectional configurations with the axes of the bridge and legs lying in in the same plane, the free terminal extremity of each leg forming substantially flat, planar end surfaces which are coplanar with each other, and therefore adapted for intimate contact with the base of a fastener so that flux may be channeled directly through the base without allowing an appreciable amount of flux leakage, the planar end surfaces being disposed at an acute angle to the plane which includes the axes of the bridge and legs, and therefore presents end surface areas greater than the cross-sectional area of the legs, wherein a magnetic flux path created in the core through the use of a current carrying coil wound thereabout may be minimized thus minimizing the core losses while allowing the flux path to be completed through the base of the fastener member directly beneath the axis of the stud.