Vertically movable staircase

Details Vertically movable staircase Vertically movable staircase

1992-05-22

1993-05-25

Olszewski, Robert P.

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

By stairway having steps forming an endless member

198778, B65G 2118

Patent

active

052131912

ABSTRACT:
A vertically movable staircase carries on a vertical pillar a plurality of steps sequentially secured to the pillar along a spiral line thereon, the pillar being vertically moved while being axially rotated by a driving device. The staircase is space saving and simple in structure.

REFERENCES:
patent: 782009 (1905-02-01), Dodge
patent: 807565 (1905-12-01), Lorillard
patent: 967710 (1910-08-01), Bennett
patent: 3878931 (1975-04-01), Luna
patent: 4434884 (1984-03-01), Kettle
patent: 4768621 (1988-09-01), Kunii
patent: 4828099 (1989-05-01), Dexter, Jr.

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