Knockdown spiral stairway

Details Knockdown spiral stairway Knockdown spiral stairway

1980-07-30

1982-07-13

Friedman, Carl D.

Static structures (e.g., buildings)

Stepped; e.g., stair

Helical type

E04F 1100

Patent

active

043387519

ABSTRACT:
A spiral stairway construction, designed for ease of assembly, is adapted for use by hobbists on a reduced scale, for display in model homes and elsewhere and for a spiral stairway installation in residences and the like. This stairway comprises a semicircular wall, a central vertical post support assembly and a plurality of treads or steps each diverging from its mounting or proximal end to its distal end as is usual in spiral stairway treads. Each proximal end has a mounting hole for removable attachment to the post support assembly in a vertically spaced relationshiped provided by spacing alignment on such support and each distal end is removably engaged with a designated point on the wall to dispose the treads in a helical path. The assembled construction is free standing and does not require anchoring the wall or post support assembly to any supporting surface.

REFERENCES:
patent: 384376 (1888-06-01), McMullin
patent: 432599 (1890-07-01), Clarke
patent: 1229482 (1917-06-01), Leclair
patent: 3740906 (1973-06-01), Schneider
patent: 3894614 (1975-07-01), Naka
patent: 3916591 (1975-11-01), Agterhof et al.
patent: 3964222 (1976-06-01), Geleijnse et al.
patent: 4190992 (1980-03-01), Takenaga

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