| 摘要 |
PROBLEM TO BE SOLVED: To provide shoes 1 of which the slip-preventing capability and cushioning property are increased. SOLUTION: The shoe 1 is equipped with an upper 2, an insole 3, a midsole 4, and an outsole 5. The outsole 5 is equipped with numerous protruding parts 6. A ratio (μb/μf) of a frictional factorμb to the tiptoe direction of the bottom surface of a back foot part B to a frictional factorμf to the heel direction of the bottom surface of a front foot part F is 0.95 or lower. In the designing of the shoe 1, first, the floor reaction forces in the horizontal direction and the vertical direction during running are measured. Thus, the time history of a ratio R of a horizontal load to a vertical load is obtained. Then, a peak value Rm of the ratio R is determined. Then, a pattern of the bottom surface is determined in such a manner that the frictional factorμb to the tiptoe direction of the bottom surface of the back foot part B may become from 50% to 98% of the peak value Rm, and the frictional factorμf to the heel direction of the bottom surface of the front foot part F may become 100% or higher of the peak value Rm. COPYRIGHT: (C)2004,JPO&NCIPI
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