BEAD SEAL RING UNIT

摘要

This invention is directed to the retreading of radial tires (10) by use of a bead sealing ring (24) unit that provides positive mechanical pressure for sealing the curing envelope (12) between the bead sealing ring unit and the bead area (16) of the tire by a radial force. In its relaxed or initial condition, the bead sealing ring unit has a diameter smaller than the bead diameter of the tire. The bead sealing ring unit is placed into sealing position and then expanded by a locking device secured to a metal band which is part of the bead sealing ring unit.