Method and drum for molding tire

A method of building a tire in which a cylindrical carcass band is shaped on a building drum, and bead cores and bead fillers are arranged on an outer peripheral side of the carcass band to form a green case, and a central portion of the green case is expansion-deformed in a radial direction while approaching both the bead cores to each other under a restraint of the bead core, and the green case is pressed onto an inner peripheral face of a belt-tread band composed mainly of a belt and a tread, and thereafter the carcass band is pushed onto rigid support members comprising two differently shaped kinds of rigid support members alternately arranged in a peripheral direction without space in at least diameter-expanded posture, arranged inward in an axial direction of the carcass band over a whole of an arranging region of the bead core and the bead filler together therewith.

A tire building drum comprising a building bladder having substantially a cylindrical form and capable of expanding in a radial direction, a pair of bead lock means located adjacent to end portions of the building bladder and movable laterally as well as in a diameter-expansion direction, double fold bladders located adjacent to an outside of each bead lock means and arranged inward and outward in the radial direction, and plural rigid support members comprising two differently shaped kinds of rigid support members alternately arranged in a peripheral direction, arranged inside the building bladder and at a position adjacent to an inside of the bead lock means and movable in diameter expansion and contraction directions in the radial direction in which these members are aligned in a peripheral direction without space in at least diameter-expanded posture and form an annular plane having a given width in the radial direction at a plane perpendicular to a center axial line of the building bladder and crossing thereto.