| 摘要 |
PURPOSE: Crampons are provided to prevent a chain from being unintentionally separated from a band during use thereof. CONSTITUTION: Crampons comprise a spring unit(100) and a spike unit(200). The spring unit has elasticity, covers the girth of footwear into a closed-loop shape and is supported in the footwear. The spring unit has first strength that is the same as or stronger than the second strength of the spike unit. The spike unit is expanded from the spring unit in order to cover the lower part of the footwear. The spike unit has second strength that is the same as or weaker than the first strength of the spring unit. |
