Apparatus for producing pneumatic tyres
AssigneePirelli Tyre S.p.A.
InventorGianni Mancini
Life of this patent
Estimating the term…
Abstract
Along a building line, a green tire is built on a rigid toroidal support having an outer surface substantially conforming in shape to an inner surface of the green tire. The green tire is then transferred to a bead molding and prevulcanization station where each bead of the tire is molded by tightening it between a surface portion of the toroidal support and an annular clamping surface carried by a removable tightening flange. The tightened beads are prevulcanized through a heat supply by means of electric resistors integrated into the tightening flanges. The tire with the prevulcanized and tightened beads is transferred into a molding cavity having an inner wall of a shape substantially conforming to that of the outer surface of the molded tire, to carry out molding of the tire and complete vulcanization of same.
Claims38
An apparatus for producing pneumatic tyres, the apparatus comprising:
- a building line designed to form a green tyre on a toroidal support, the green tyre having a pair of beads each defined along a respective inner circumferential edge of said tyre, said toroidal support having an outer surface substantially conforming in shape to an inner surface of the green tyre;
- bead moulding devices to tighten each bead between a surface portion of the toroidal support and an annular clamping surface axially opposite to said surface portion of the toroidal support;
- a moulding unit for the tyre having a moulding cavity with an inner wall substantially conforming in shape to an outer surface of the moulded tyre;
- devices for vulcanising the tyre;
- actuating devices for transferring the tyre together with said toroidal support and said bead moulding devices into the moulding cavity;
- and
- prevulcanisation devices configured to at least partly prevulcanise the beads while the bead moulding devices tighten the beads between the surface portion of the toroidal support and the annular clamping surface, and before the actuating devices transfer the tyre into the moulding cavity:
- wherein the actuating devices are configured to transfer the tyre into the moulding cavity with the beads at least partially vulcanised.
An apparatus for producing pneumatic tyres, the apparatus comprising:
- a building line designed to form a green tyre on a toroidal support, the green tyre having a pair of beads each defined along a respective inner circumferential edge of said tyre, said toroidal support having an outer surface substantially conforming in shape to an inner surface of the green tyre;
- bead moulding devices to tighten each bead between a surface portion of the toroidal support and an annular clamping surface axially opposite to said surface portion of the toroidal support;
- a moulding unit for the tyre having a moulding cavity with an inner wall substantially conforming in shape to an outer surface of the moulded tyre;
- devices for vulcanising the tyre;
- actuating devices for transferring the tyre together with said toroidal support and said bead moulding devices into the moulding cavity;
- and
- spring elements to urge each clamping surface and the corresponding surface portion of the toroidal support against each other with a predetermined tightening load during moulding of the beads.
Dependencies are inferred from the claim text.