| 摘要 |
The device has a base (3) extending in length from a rear end (4) to a front end (5) and extending in width from an edge (6) to another edge. A rear support unit (23) is mounted in rotation with respect to the base. A link (41) is placed on the base and cooperates with the unit (23) for limiting the rotation of the unit (23) towards rear. The position of the unit (23) with respect to the base is longitudinally adjusted. |
