| 摘要 |
<p>The device has a case (1) arranged on an inside of a footwear. A rod (7) is slidably mounted in a conduit (4) between an inserted position and a deployed position. The conduit includes a rear end (9) placed in the conduit and a front end (10) supported against a front region inside the footwear. An elastic biasing unit (8) places the rod in the deployed position. A slider (12) is integral with movement of the rod and includes one end (13) projecting from the case, which is arranged opposite to a reference mark scale (14) in a position of the slider in the conduit.</p> |
