| 摘要 |
<p>A rolling platform (10) comprises a static frame (11) fixed to a building by clamps (17), and a movable frame (20) telescopically slidable between a retracted position within the building and an extended position extending outwardly of the building. The movable frame (20) is carried by rollers (30, 31). Further rollers (32) are positioned to engage the movable frame (20) when retracted in such a manner that the movable frame (20) can be of greater length than the static frame (11).</p> |
