Abstract: An apparatus for molding and vulcanization of tyres for vehicle wheels includes a vulcanization press and a vulcanization mold associated with the press. The apparatus includes a pair of plates and a plurality of mold sectors that are mutually movable between an open condition and a closed condition; at least one plurality of sector carriers designed to support the mold sectors and movable together with the sectors; and a plurality of guide means on which the plurality of sector carriers slide for movement of the mold sectors from the closed condition to the open condition and vice versa, at least part of the sector carriers having at least one spring device designed to exert a thrust action adapted to ensure sliding of the sector carrier on the guide element in a substantially parallel direction.

Abstract: An apparatus for moulding and vulcanisation of tyres for vehicle wheels includes a vulcanisation press and a vulcanisation mould associated with the press. The apparatus includes a pair of plates and a plurality of mould sectors that are mutually movable between an open condition and a closed condition; at least one plurality of sector carriers designed to support the mould sectors and movable together with the sectors; and a plurality of guide means on which the plurality of sector carriers slide for movement of the mould sectors from the closed condition to the open condition and vice versa, at least part of the sector carriers having at least one spring device designed to exert a thrust action adapted to ensure sliding of the sector carrier on the guide element in a substantially parallel direction.

Abstract: A process for vulcanization and moulding of a pneumatic tyres in tyre manufacture is carried out with an apparatus including a vulcanisation mould and including: a pair of plates adapted to be moved close to each other; a plurality of circumferentially distributed mould sectors; the plates and sectors being mutually movable between an open condition at which they are spaced apart to enable loading of the tyre being worked, and a closed condition at which they define a moulding cavity having a geometric configuration matching the outer surface of the tyre to be obtained. The process includes the steps of: loading the green tyre into the mould; vulcanising the tyre: opening the mould; and exerting a radially outward thrust action on each mould sector.

Abstract: A safety support for mounting on a rim of a vehicle wheel within a tire includes a substantially toroidal hollow annular body and a filling of elastically deformable expanded material. The annular body includes a convex radially outer surface, two axially opposite side surfaces, and devices for associating the annular body to the rim. The annular body is made of a rigid and substantially non-extensible material and is elastically deformable under load for absorbing stresses imparted to the tire in case of pressure loss by the tire. Each side surface is connected to the radially outer surface by respective first axially opposite connecting portions. A safety system for the vehicle wheel includes a tire and the safety support. The vehicle wheel includes the tire, the safety support, and the rim.

Abstract: A safety support (1) is described intended for being mounted on a rim (2) of a vehicle wheel within a tire (3), for supporting said tire (3) in case of pressure loss, which support comprises a substantially toroidal hollow annular body (5) made of a rigid and substantially non-extensible material including a filling (6) of elastically deformable expanded material. Advantageously, the safety support (1) of the invention is resistant to centrifugation and has an adequate contact surface with the crown portion (33), without however involving an excessive increase in the total weight of the wheel wherein the same is mounted.

Abstract: A removable plug for an air vent in a mold includes an annular bushing and an annular insert. The annular bushing includes a central bore preferably of about 0.8 mm. The annular insert includes a central bore preferably of about 0.1 mm to 0.4 mm. The annular insert is snugly fitted into the central bore of the annular bushing. A mold including the plug and a method for making the mold are also described.