| 摘要 |
The relief (3) is incised (10) from its outer tread surface (6) down to and through the lower side walls (7, 8) of the relief, noting that the relief increases in transverse width to the tread surface (6). The broad incisions made, do not penetrate the ridge (5) to which parts of the tread surface (6) and side wall (7, 8) are common. On each side of the tread wall, the radial ridge depth is given by H2-H1 and H2'-H1 (in the example illustrated H1 = 0 and is not shown), measured from the tread surface. These measurements correspond to differing wear levels. An Independent claim is included for a mold section for the corresponding tire. This has pull-out dovetailed sections, which leave behind the shape of the broad incision in the ridges of the tire. Ridge resilience permits stretching so that the downwardly-widening dovetail can be pulled out without causing damage. (reference to the patent illustrations is recommended for clarification) Preferred features: H2 is 40%-90% of the groove depth. A variant in which the tread surface itself is depressed by H1 and H1' on each side of the incision, is described and illustrated. The values again correspond with wear levels. Numbers of similar incisions are made around the ridges. The tread and its variants are further detailed. The corresponding tire fitted with the tread is also claimed.
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