Adjustable height stairway

Details Adjustable height stairway Adjustable height stairway

1992-09-14

1993-03-02

Chilcot, Jr., Richard E.

Static structures (e.g., buildings)

Stepped; e.g., stair

Interconnected relatively movable components

182 1, E04F 1100

Patent

active

051898543

ABSTRACT:
The invention is an adjustable height stairway having two parallel elongate ower 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.

REFERENCES:
patent: 4593503 (1986-06-01), Koslowski
patent: 4768617 (1988-09-01), Mason et al.
patent: 4959935 (1990-10-01), Stob
patent: 4971168 (1990-11-01), Stanescy

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