| 摘要 |
A stairway connects a stationary member, such as a fixed dock, to a member, such as a floating dock or a floating vessel, which moves vertically with respect to the stationary member. The stairway moves with the moving member and includes stringer members connected to hand rail members by picket members and step supporting pivot arms connected to adjustment arms in a manner which forms a compound parallelogram linkage in which the picket members and the pivot arms remain vertical during movement of the stairway whereby the steps remain horizontal and the hand rails remain parallel to the stringer members during such movement. The stairway includes wheels that rollably engage the moving member and moves between angular orientations as the moving member moves with respect to the stationary member. Steps are mounted on the pivot arms and include walking surfaces which remain horizontally oriented during movement of the stairway. |
