| 摘要 |
An athletic shoe for use on a relatively hard playing surface has an outer ground sole with grooves therein that define ribs between adjacent grooves, particularly in the toe and ball areas of the sole, is characterized in that the grooves are generally arranged in concentric curves with reference to the center of the toe and ball area and the grooves define similarly arranged concentric ribs between adjacent grooves, each groove being defined by two evenly spaced walls into the surface of the sole, the outer wall and the inner wall, the outer wall being substantially perpendicular to the sole surface and the inner wall being tapered from the sole surface toward the outer wall to the bottom of the groove. Thus, each rib has an inner side substantially perpendicular to the sole surface and an outer side that tapers from the sole surface toward the outer perimeter of the sole. This groove and rib design minimizes the tendency of hard particles becoming stuck in the groove and soft material becoming packed in the groove; and so it minimizes groove clogging. Furthermore, the arrangement of ribs in the areas of the outer sole that bear the hardest against the playing surface in dynamic action have the perpendicular side thereof oriented transverse to the direction of slipping associated with the action and the effect of the perpendicular side is to clean the playing surface so that the surface of the rib contacting the playing surface will stick to the playing surface.
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