| 摘要 |
A device is provided that includes a post, an arm assembly being pivotably connected to the post at one or more connection points, a set of beams comprising an upper beam set and a lower beam set, wherein the upper beam set and the lower beam set each comprise one or more beams, the set of beams being pivotably connected to the post, wherein the post is connected to the upper beam set and the lower beam set such that the lower beam set and the upper beam set are positioned at a first distance apart from one another at their connection point with the post, a platform being pivotably connected to the set of beams, wherein the platform is connected to the upper beam set and the lower beam set such that the lower beam set and the upper beam set are positioned at a second distance apart from one another at their connection point with the platform and a lift tube having a length and being pivotably connected to the upper beam set at one or more connection points and the arm assembly at one or more connection points. |
