| 摘要 |
<p>The elastic unit (10) is assembled of an upper and a lower disk (11), accommodating a helical spring (12) between them. The spring (12) has a narrow center and conical upper and lower segments. The elastic unit (10) is positioned inside a recess (221) at the heel part of the sole and surrounded from a hollow border (22). The border (22) and the front part (21) of the sole are filled with air by a small tube (13). A second tube (14) is used for compensating the pressure.</p> |
