| 摘要 |
A stabilized, collapsible platform having two stages, each adjustable with respect to the other along a support column except to the extent restricted by a temporary lock. In a preferred embodiment, the platform may be adjusted along the support column with each stage moving independently of the other, and, once in the desired position, the temporary lock may then be employed to restrict movement of the stages relative to one another. The temporary lock may additionally stabilize the platform against movement with respect to the support column. |
