| 摘要 |
A tire building drum (10) having a plurality of drum segments (12, 14) which define a cylindrical drum surface (10a) when the segments are moved to an expanded position. A spider (26) that forms part of a rotatable hub (20) is connectable to a drive source. A swing arm hub is carried by the spider hub (20) and is relatively rotatable. The tire drum (10) includes a second spider (40) that is coupled to the first spider (26) with both spiders including radial arms that interconnect certain of the drum segments with the spiders (26, 40). The swing arm includes control links (58, 60) pivotally connected to and interconnected with the segments, such that relative rotation between the swing arm and the spider moves the drum segments (12, 14) in coordinated movement from an expanded position to a radially collapsed position.
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