Adjustable Height Stairway.
Patent application, filed 14 Sep 92,
DEPARTMENT OF THE ARMY WASHINGTON DC
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The invention is an adjustable height stairway having two parallel elongate lower frame members and two parallel elongate upper frame members swingable on a base. The upper frame members have wave-like edges that can fit with complimentary wave-like edges on the lower frame members. A set of steps parallel to the base has pivotal connections to each frame member at peaks of the wave-like edges. At a first angular position, the stairway is in a collapsed configuration wherein the pivotal connections are coplanar and the steps lie in a common plane to form a runway. In a second angular position the stairway is in an expanded configuration form a ladder or set of stairs.
- Combat Vehicles
- Computer Programming and Software