Adjustable stairway

Details Adjustable stairway Adjustable stairway

1989-09-25

1990-10-02

Murtagh, John E.

Static structures (e.g., buildings)

Stepped; e.g., stair

Interconnected relatively movable components

182156, E04F 1100

Patent

active

049599356

ABSTRACT:
A prefabricated adjustable stairway having a pair of opposed stacked stringers supporting each step. A stair support bracket is pivotally attached to each top stringer and is connected by an associated link to the supporting bottom stringer. Each step is mounted on an opposed pair of brackets. Sliding movement of the top stringer on the bottom stringer is used to adjust each step to a horizontal plane regardless of the inclination of the stairway. The steps can then be fixed in this position.

REFERENCES:
patent: 1235411 (1917-07-01), Andrews
patent: 2498375 (1950-02-01), Moore
patent: 3367444 (1968-02-01), Meddick
patent: 3626438 (1971-12-01), Cornell
patent: 3713511 (1973-01-01), Hinkle
patent: 3731761 (1973-05-01), Glenn
patent: 3765137 (1973-10-01), Loix
patent: 3885365 (1975-05-01), Cox
patent: 3962838 (1976-06-01), Cox
patent: 4124957 (1978-11-01), Poulain
patent: 4406347 (1983-09-01), Stathopoulos
patent: 4421206 (1983-12-01), Kummerlin
patent: 4593503 (1986-06-01), Koslowski
patent: 4642953 (1987-02-01), DeGood

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