| 摘要 |
<p>An elevating platform assembly (10) includes a generally vertical mast (12) having a generally vertical rack (40) mounted thereon. A first trolley (100) is coupled to the mast and is moveable therealong. A drive mechanism (110) is carried by the first trolley and includes at least one pinion (118) in mating engagement with the rack. An elongated elevating platform (16) extends from the mast and has a second trolley (50) mounted adjacent one end thereof. The second trolley (50) couples the elevating platform to the mast and is moveable along the mast. The first trolley (100) is coupled to at least one of the second trolley (50) and elevating platform (16) in a manner to maintain alignment of the at least one pinion and rack when loads are placed on the elevating platform that create moments at the mast. <IMAGE></p> |
