| 摘要 |
<p>The device (1) has an attachment unit varying between attachment and release configurations. A support body (7) varies between a service configuration in which the support body is in contact with a rail (2) to support a fraction of weight of the device while allowing the device to move along the rail, and a rest configuration in which the support body does not support the weight of the device. The attachment unit and the support body move between their respective configurations independent from each other.</p> |
