US 11,701,851 B2
Method for building tyres
Oliver Haupt, Breuberg (DE); Maurizio Marchini, Milan (IT); Silvio Montanari, Milan (IT); Mario Mariani, Milan (IT); and Davide Lupo Conti, Milan (IT)
Assigned to PIRELLI S.P.A., Milan (IT)
Filed by PIRELLI TYRE S.P.A., Milan (IT)
Filed on Dec. 13, 2021, as Appl. No. 17/549,380.
Application 17/549,380 is a continuation of application No. 16/836,545, filed on Mar. 31, 2020, granted, now 11,230,075.
Application 16/836,545 is a continuation of application No. 15/037,209, granted, now 10,639,860, issued on May 5, 2020, previously published as PCT/IB2014/065582, filed on Oct. 24, 2014.
Claims priority of application No. MI2013A001970 (IT), filed on Nov. 26, 2013.
Prior Publication US 2022/0105698 A1, Apr. 7, 2022
Int. Cl. B29D 30/36 (2006.01); B29D 30/16 (2006.01); B29D 30/24 (2006.01); B29D 30/26 (2006.01); B29D 30/08 (2006.01)
CPC B29D 30/36 (2013.01) [B29D 30/1621 (2013.01); B29D 30/1628 (2013.01); B29D 30/247 (2013.01); B29D 30/08 (2013.01); B29D 30/24 (2013.01); B29D 30/244 (2013.01); B29D 30/245 (2013.01); B29D 2030/265 (2013.01); B29D 2030/2642 (2013.01); B29D 2030/2657 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for building tyres comprising:
building a carcass sleeve and a crown structure of each tyre in sequence relative to each other, wherein the sequence comprises:
arranging an expandable toroidal forming drum having a radially external toroidal surface configured for contacting a radially inner surface of the carcass sleeve;
positioning the carcass sleeve at a radially external position relative to the expandable toroidal forming drum and spaced from the expandable toroidal forming drum;
shaping the carcass sleeve as a toroid until reaching a maximum carcass sleeve diameter at the radially inner surface of the carcass sleeve, while said forming drum is positioned inside, and spaced from, the carcass sleeve;
expanding the expandable toroidal forming drum to form an expanded toroidal forming drum remaining spaced from the carcass sleeve and exhibiting a maximum forming drum diameter;
radially contracting the carcass sleeve shaped as a toroid for subsequently contacting the radially internal surface of the carcass sleeve to the expanded toroidal forming drum; and
building the crown structure directly on a radially external surface of the carcass sleeve shaped as a toroid and contacted with the expanded toroidal forming drum.