MANUFACTURE OF TIRE AND TIRE PRESS MECHANISM

摘要

A radial tire having an annular cavity is built with precision and positioned between the upper and lower mold sections of a tire press. An upper center mechanism has an inflatable clamping bladder for gripping the upper bead of the tire which is suspended from the center mechanism to insure orientation of the tire components in substantially the built condition of the tire. The upper center mechanism including the upper bead ring and clamping bladder is lowered to grip and center the upper bead on the upper bead ring. The lower bead is positioned over the lower bead ring and sealing air may be utilized to provide the necessary centering and seating. The sealing air in the tire cavity is maintained at a pressure sufficient to hold the beads in seating engagement with the bead rings while the curing bladder is being inserted in the tire cavity and while the clamping bladder is deflated and retracted with the center support assembly from the tire cavity. The press may then be closed for vulcanizing the tire without distortion by the curing bladder. The annular inflatable clamping bladder is mounted on an upper center support assembly of the upper center mechanism for movement with the assembly upward into a retracted storage position in an upper well of the upper center mechanism and downward into an operating position for inflation and engagement with the upper bead of the tire.