| 摘要 |
1,056,878. Pneumatic tyres. PIRELLI S.p.A. Sept. 19, 1963 [Oct. 4. 1962]. No. 36873/63. Heading B7C. A tread ring 2, for pneumatic tyres of the replaceable tread type, includes an inextensible reinforcement 3 constituted by a single layer of metallic cords or cord convolutions laid parallel or substantially parallel to the mid-circumferential plane and having an axial width substantially equal to that of the ring 2, there being disposed in at least the axially outer zones of the tread ring and radially inwardly of the reinforcement 3 at least one layer 7 of nylon, rayon or cotton cords which are parallel to each other in each layer and which form an angle greater than 30 degrees with the mid-circumferential plane. The layer 7 of cords may extend over substantially the whole axial width of the tread ring 2 or may comprise two axially spaced strips disposed in the axially outer zones of the tread ring. The cords of the layer 7 preferably form an angle of 90 degrees with the midcircumferential plane. |
