TREAD FOR RADIAL TYRE THE ELEMENTS IN RELIEF OF WHICH ARE PROVIDED WITH INCISIONS HAVING BROKEN LINE OR UNDULATED LINE TRACES IN THE DIRECTION OF THEIR DEPTH

摘要

In order to improve the wear life of a tread having elements in relief which are provided with numerous incisions, each element in relief which is defined by circumferential grooves and transverse grooves comprises an even number of incisions which have rectilinear traces on the surface of the tread and, in cross-section, broken line or undulated line traces, the mean axes of which are perpendicular to the surface of the tread, and in such manner that the trace of one incision is identical to the symmetrical trace, with respect to its mean axis, of the trace of a circumferentially adjacent incision.