Abstract: A demountable sealed joint (1) for the fluid tight connection of a sheet member (2) to a support (3), in which the latter is provided with a dovetail groove (5) engaged by a bead (4) of substantially the same shape as said groove and forming a portion of the sheet member (2) and substantially rigid in a transverse direction; the groove (5) comprising two longitudinal undercuts (6, 7) engaged by respective longitudinal extensions (14, 15) of said bead (4) and of which one is more pronounced than the other, the sheet member (2) being connected to the bead (4) substantially at the base of the extension (15) engaged in the more pronounced undercut and at a predetermined distance from the other extension (14).

Abstract: A tire forming drum provided with two half drums axially mobile relative to each other and arranged to support on their outer periphery tubular plies of a carcass to be formed, each half drum being arranged to produce automatic folding of the relative end of said tubular plies about a respective annular bead by means of a respective multiple air chamber element rigid at one end with an outer flange of the relative half drum, and at the other end with a tubular support member mobile under the thrust of said multiple air chamber element between a retracted rest position inside said flange and an extracted working position in which said tubular member projects axially outward from the relative half drum.