US Patent 7507077 Self-locking tire blade system

A tire blade system for curing tires including a tire mold defining at least one slot, the slot defining a first recess and a second recess spaced by a bridge, the walls of the first and second recess being straight; a blade including a body exposed within the tire mold and an attachment assembly received in the slot, the attachment assembly including a first and a second prong spaced by a notch; and wherein the first prong includes a engaging edge and the second prong including an undercut edge, and when the blade is inserted into the slot, the engaging edge deflects the bridge toward the undercut edge to resiliently hold the blade in the slot.