| 摘要 |
<p>The device has a carriage (6) comprising a front wheel (8) that is equipped with a tread of a concave curved section. The section scrolls on a rail (3) and a slope (4), where the slope is connected to the rail in an articulated manner. The slope is deviated toward a side at a time of receiving the weight applied by the wheel. The carriage is provided with a rear wheel longitudinally arranged with the front wheel and adapted to roll longitudinally on the rail and move transversely on the slope, where the carriage is connected to an opening (100) by an articulation unit.</p> |
