Bead locking method and apparatus for use in green tyre building machine.

摘要

A bead locking apparatus comprising bead support segments (6) disposed in an annular arrangements at each of the axially opposite ends of building drum (1) mounted on a rotary shaft (4) the support segments (6) being movable outwards or inwards radially of the drum (1), an elastic ring (8) fitted in an annular recess (20) formed in the outer periphery of the annular arrangement of segments (6), a segment drive device for moving the bead support segments (6) radially outward, and a device for radially enlarging the elastic ring (8) independently of the segments (6). The bead may then be first primarily locked by the elastic ring and then secondarily locked by the segments. <IMAGE>