| 摘要 |
821,215. Tyre treads. OLSEN, S. I. March 3, 1958 [Feb. 12, 1958], No. 6761/58. Class 144(2). A tyre tread comprises two circumferential groups 1, 2 of rubber studs arranged as shown in a braid pattern in each group with each stud having a non-rectangular parallelogram-shaped tread surface and being spaced from the adjacent studs in the group by a narrow slot 3, each group 1, 2 being flanked on each side by at least one continuous circumferential rib 4, 5, 9, 10 which is spaced from the group by narrow slots 6, 7, 11, 12, respectively, of the same axial width as the slots 3, and each tread shoulder being formed by a further continuous circumferential rib 13, 14 which is spaced from the adjacent rib 9, 10 by a groove 15, 16, of substantially greater axial width than the aforesaid slots. As shown, the central ribs 4, 5 are spaced by a zig-zag groove 8 of the same axial width as the zig-zag grooves 15, 16. Each rib 4, 5, 9, 10 is of the same axial width as the rubber studs which is preferably 8 to 10 mms., the studs having a long diagonal of about 25 mms., and the slots 3, 6, 7, 11, 12 being 1 ¢ to 2 mms. wide. The braid patterns of the two stud groups 1, 2 may have an oppositely-directed oblique formation, respectively, as shown, or they may extend in the same direction. |
