Bridgestone Corporation

Bridgestone Europe Nv/sa

Stefano Ducci

Paolo Straffi

Antonio Tirone

Daniele Cristadoro

Alessandro Martini

Yochiro Kondo

Jose Silicani

Jos&eacute; Silicani

Giuseppe Stracqualursi

A winter tyre with improved traction on snow surfaces; the tyre has a tread with a raised pattern defined by a number of longitudinal and transverse grooves which form at least one longitudinal row of blocks projecting radially from a base surface of the tread. Each block has two longitudinal lateral surfaces bounding two corresponding longitudinal grooves, and two transverse lateral surfaces bounding two corresponding transverse grooves. At least one of the blocks has lateral channels, each of which is formed on the lateral surface of a corresponding block, extends from the base surface of the tread to a top surface of the block, and is designed to impede radial spin-out of snow trapped inside the lateral channel.

Winter tyre with improved traction on snow surfaces

A winter tire with improved traction on snow surfaces; the tire has a tread with a raised pattern defined by a number of longitudinal and transverse grooves which form at least one longitudinal row of blocks projecting radially from a base surface of the tread. Each block has two longitudinal lateral surfaces bounding two corresponding longitudinal grooves, and two transverse lateral surfaces bounding two corresponding transverse grooves. At least one of the blocks has lateral channels, each of which is formed on the lateral surface of a corresponding block, extends from the base surface of the tread to a top surface of the block, and is designed to impede radial spin-out of snow trapped inside the lateral channel.

A tire, the tread of which has an equatorial plane and at least one raised element, which has a longitudinal axis and respective lateral edges substantially parallel to the equatorial plane, and sipes crosswise to the longitudinal axis; and wherein at least one sipe is Z-shaped and defined by three consecutive portions, a first and a third portion of which are end portions originating at respective lateral edges, and a second portion of which is an intermediate portion connected to the first portion at a first point, which is located a first distance from the lateral edge from which the relevant first portion originates, and to the third portion at a second point located a second distance from the lateral edge from which the relevant first portion originates; the intermediate portion sloping with respect to the longitudinal axis, and the second distance being less than the first distance.

Tire with tread having Z-shaped sipes in circumferential rib

An antistatic tire having a tread made from a first mix (MP ) and having two annular shoulders and a peripheral rolling surface, two opposite annular portions of the rolling surface being defined by outer annular surfaces of the shoulders. Each shoulder is made from a second mix (MPC), which is electrically conducting, and which, under low strain, has substantially the same rigidity as the first mix (MP ), and, under high strain, has a greater rigidity than the first mix (MP ). In a second embodiment, an electrically conducting element is inserted inside the tread. The conducting element and the shoulders both being made of an electrically conducting third mix, which, under low strain and in the cured state, has the same mechanical characteristics as the first mix in the cured state, and, under high strain, has the same mechanical characteristics as the second mix in the cured state.

Antistatic tire

An antistatic tire and relative production method, whereby a portion of a tread made of an electrically insulating mix is hollowed out and filled with a cement (C) in the form of a carbon black mix in a volatile liquid; the carbon black mix being left inside the hollow portion when the volatile liquid evaporates, and defining inside the tread at least one conducting body communicating with a rolling surface of the tire.

Growing community of inventors

Rome, Italy

Stefano Ducci