| 摘要 |
1,168,716. Moulding tyres. UNIROYAL ENGLEBERT FRANCE. 19 May, 1967 [1 June, 1966], No. 23371/67. Heading B5A. A mould for producing an asymmetric pneumatic tyre from a symmetrical tyre carcass having at least the tread band uncured, comprises opposed mould members 1, 2, a segmental tread moulding ring 3 therebetween, means for radially contracting the ring towards a tyre in the mould so that as the ring contracts, and the members 1, 2 move together axially, its median equatorial plane X-X moves axially relative the median equatorial plane t-t of the members to axially displace at least a portion of the tyre tread band. Frusto-conical wall surfaces S1, S<SP>1</SP>1 of different inclinations of the members 1, 2 engage corresponding surfaces of the tread ring segments. Dovetail portions 7 of the latter engage within grooves 6 in the member 1 which is axially moved towards the stationary member 2 by a fluid motor 13, 14. The ring 3 may be asymmetric with respect to its median plane. |
