| 摘要 |
910,673. Replaceable tread tyres. PIRELLI S.p.A. July 7, 1961 [Aug. 2, 1960], No. 24663/61. Class 144 (2). In a pneumatic tyre having a replaceable tread formed by rings 6,7, 8 which have circumferential inextensible reinforcements 11, 12, 13 near their inner peripheries and seat in circumferential grooves, defined by circumferential ridges 16, 17 in the casing periphery, correct axial alignment of the tread rings to ensure the correct overall tread pattern is achieved by integrally connecting the tread rings together in manufacture by annular bridges 9, 10 which are of the same material as the rings and are offset radially outwards of the inner periphery of the rings to bear on the ridges 16, 17. The bridges may be reinforced by one or more layers of parallel cords 19 extending across the full width of the tread formed by the rings and through the bridges 9, 10, the cords subtending an angle greater than 70 degrees to the circumferential direction. Where such reinforcement is used, the casing shoulder ridges 15, 18, Fig. 3, may be dispensed with as in Fig. 4. Specifications 787,705, 815,053, 825,632, 905,469 and 905,518 are referred to. |
