Patent ID: 8272417
Filing Date: 2012-09-25
Classification: B29D

Abstract:
1. A rotary radial expand collapse tire building drum comprising a plurality of segments defining an outer circumference of said tire building drum, said segments being divided into two sets, one set being located to each opposite side of a transverse central plane of said tire building drum, said central plane being disposed normal to a rotational axis of said drum, said two sets of segments being adapted to be driven by a rotatable hub assembly between a collapsed position in which a formed tire carcass may be removed from said tire building drum and an expanded position in which a tire carcass may be formed on said drum wherein each set of segments are mounted for selective relative axial positioning, and an adjustment means located outside of the rotational axis of said drum, which is arranged to adjust an overall working width of said drum, said adjustment means including an inboard hub and an outboard hub, wherein a first one of said two sets of segments is associated with said inboard hub located to one side of said transverse central plane and a second one of said two sets of segments is associated with said outboard hub located to the opposite side of said transverse central plane, and in which said adjustment means further comprises a first set of inboard leadscrews associated with said inboard hub and a second set of outboard leadscrews associated with said outboard hub, each of said inboard leadscrews and said outboard leadscrews being adapted for rotation with respect to one another such that rotation of said outboard leadscrews causes relative movement of said inboard leadscrews and said outboard leadscrews causing the axial separation of said inboard hub and said outboard hub to be adjusted.