Marangoni Meccanica S.p.a.

The Goodyear & Tire Rubber Company

Viscardo Baldoni

George Michael Stoila

Dale Eugene Wells

Thierry Royer

Giorgio Marangoni

Thomas Alan Sells

Minwu Yao

Flavio Boscolo

Giogio Marangoni

A tire building drum is described that includes an inboard section, a center section and an outboard section. The inboard section has a rotating spindle and a sliding shaft, and the sliding shaft is slidable within the spindle. The inboard section further includes a radially expandable bead lock device mounted on the spindle. The center section has an internal hub mounted on the sliding shaft and further comprises a plurality of tiles that are radially expandable. The outboard section of the drum is mounted on a distal end of the sliding shaft, and further includes a radially expandable bead lock device. The center section and the outboard section are each axially movable by sliding of the sliding shaft.

Tire building drum

To form a tire carcass, a body ply is wound about a drum, which has two half-drums movable axially in opposite directions to and from a center plane of the drum, and having respective turn-up bladders, on each of which is laid a respective annular lateral portion of the body ply; each annular lateral portion being turned up about a respective bead bundle and onto a sidewall of a toroidal-shaped annular central portion of the body ply by inflating the relative turn-up bladder and controlling distension of a given annular portion of the turn-up bladder so that, when inflation is completed, the annular portion assumes a given final position, in which an intermediate portion of the turn-up bladder rolls outwards along the relative sidewall of the annular central portion of the body ply.

Tyre carcass forming method and drum

To build a tire carcass, a tubular carcass body is formed about a building drum, which has a longitudinal axis, and an outer surface coaxial with the longitudinal axis and defined at least partly by a ring of longitudinal articulated rods lying in respective planes of a sheaf of planes through the longitudinal axis; the building drum locking two bead bundles to the tubular carcass body and torus-shaping the tubular carcass body by moving and/or deforming the articulated rods in their planes.

Tire carcass building method and drum

Growing community of inventors

Rovereto, Italy

Viscardo Baldoni