| 摘要 |
<p>The device has a body (1) that is provided with two arms (3) that are provided in an elevating manner, where the arms are drawn aside and are provided parallel to each other. A spring (7) is provided such that the pressure of the spring allows the movement of the arms to be stopped. A pivot (5) is arranged between the arms, where a part between the pivot and an end of the arm regulates pressure to be exerted on the arms. The arms are able to be rotated under the effect of traction of the spring.</p> |
