Patent ID: 9649818
Date: 2017-05-16
CPC Classifications: B29D,Y10T

Claim:
1. A process for building a tyre, the process comprising: providing a building drum having an outer circumferential surface defining an application diameter; providing two axially approachable halves in said building drum; applying at least one carcass ply having axially opposite end flaps around said outer circumferential surface, according to said application diameter; engaging an annular anchoring structure defining a fitting diameter that is smaller than said application diameter, coaxially around each of the end flaps, so as to make a carcass sleeve; forming at least one pair of sidewalls around the carcass sleeve by laying of at least one first continuous elongated element into approached coils; locating an outer sleeve at a coaxially centered position around said at least one carcass ply, shaping said at least one carcass ply into a toroidal configuration, whereby said at least one carcass ply is applied against a radially internal surface of the outer sleeve; wherein, before application of said at least one carcass ply, auxiliary support members, each having at least one circumferential rest surface extending in a continuation of the outer circumferential surface of the building drum, are engaged with the building drum, each in axially approached relationship with one of said halves; wherein each auxiliary support member is engaged with the building drum at least at a connecting member carried by the building drum, wherein each connecting member is in the form of a cylindrical sleeve; and wherein, after engaging each annular anchoring structure and before shaping the at least one carcass ply, auxiliary shaping members separate from the building drum are connected to the building drum by a fastening device operatively carried by a flanged element of each auxiliary shaping member, each auxiliary shaping member being connected at least to a respective one of said connecting members in place of each auxiliary support member, the fastening device comprising a guide sleeve internally defining an engagement seat slidably engaged on a cylindrical surface of the cylindrical sleeve of the respective one of said connecting members, each auxiliary shaping member having a continuous circumferential extension to hermetically seal the carcass sleeve at the annular anchoring structures thereby facilitating radial expansion of the sleeve itself through inflation during the shaping and maintenance of the inflated state following the shaping.