Patent ID: 6837292
Filing Date: 2005-01-04
Classification: B29D

Abstract:
1. Tire drum comprising a turn-up mechanism for use in building an unvulcanized tire having tire components of rubber or provided with reinforcement cords and two bead cores which either may or may not be provided with a bead filling strip, which tire drum is provided with a central axis, two ring segments placed around the axis and spaced apart each for supporting a bead core, means for radially expanding the part of the tire components that is situated between the ring segments, in which the tire drum on either side outside of the ring segments is provided with a set of axially extending hinged arms, in which each arm is provided with an end oriented towards the ring segment which end has a first turn-up roller, means for axially and radially moving each set of arms from a first position in which the first rollers of the set of arms form a virtually closed ring to an expanded second position for pressing a part of the tire components situated outside of the ring segments against the expanded part of the tire components situated between the ring segments, in which the arms extend in an arm direction and in which the arms at the ends near the first rollers are provided with support surfaces for supporting the tire components, said support surfaces being movable in the arm direction along the arm and in the first position form a virtually closed cylindrical surface for supporting the tire components and in the second position said support surfaces on said arms are spaced from one another in circumferential direction of the tire drum.