| 摘要 |
A unit for preventing footwear sliding comprises a handle to extend a spike from a heel for different distances, a metal spike, which is fixed in a metal body, a tooth gear with a shaft, which allow to adjust extension of the spike, a hexagon. The height of the spike h and the radius of its base are in a ratio of h:r = 4,5:(3.8...3.2), and the thickness of the spike S and the diameter of its base D are in a ratio S:D = 1.2:(1.2...0.7). |
