| 摘要 |
724,210. Wheel tyres. GOODRICH CO., B. F. March 26, 1952. No. 7744/52. Class 144 (2) A tyre tread comprises spaced circumferential ribs 17, some or all of which comprise transversely-extending thin leaves 18 formed, without removal of tread material, by incisions 19 spaced at more than twelve incisions per inch circumferentially of the tyre. The tread ribs 17 are separated by grooves 16 and their axial width is at least two-thirds of their height: The incisions 19, which may number up to twenty-seven to the inch, may extend radially to a depth of one-half of the rib height.
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