Patent · US Active

Expandable forming drum, and process for building tyres

US11090891B2 · kind B2 · utility

0Cited by

3References

10Claims

0Family size

Assignee

PIRELLI TYRE S.P.A. · IT

Inventors

Silvio Montanari · Milano, IT
Maurizio Marchini · Milano, IT
Oliver Haupt · Rosenbach, DE
Mario Mariani · Milano, IT
Davide Conti · Wantage, GB

Key dates

Filing date	Mar 2, 2020
Grant date	Aug 17, 2021
Priority date	—
Expiry date	Mar 2, 2040

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2021/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A toroidal forming drum and a process for building tyres. The toroidal forming drum (23) is expanded within a shaped carcass sleeve (12), for supporting the carcass sleeve (12) against an abutment surface (“S”) externally provided by the forming drum (23). An elementary semi-finished product (54a, 54b) is applied around the shaped carcass sleeve (12), by pressing the elementary semi-finished product (54a, 54b) towards the abutment surface (“S”). The abutment surface (“S”) has circumferential rows of solid portions (40) alternated with hollow portions (41). The solid portions (40), arranged along axially opposite circumferential edges of the abutment surface (“S”), have a transverse size comprised between 10% and 60% of a transverse size presented by the solid portions (40) arranged in proximity to an axial centreline plane of the abutment surface (“S”).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.