Spiral staircase

Details Spiral staircase Spiral staircase

1978-09-18

1980-03-04

Perham, Alfred C.

Static structures (e.g., buildings)

Stepped; e.g., stair

Helical type

182187, 2482194, 403234, 403237, E04F 1100

Patent

active

041909925

ABSTRACT:
This invention relates to improvements in or relating to outdoor spiral stairs comprising a column of galvanized pipe, a plurality of footstep means fixed with the column to a spiral direction and supporting means having a U-shaped bolt and nuts. Unlike the conventional welding and drilling method, a plurality of footstep means are firmly fixed with the column by clamping the supporting means by the U-shaped bolt and nuts.

REFERENCES:
patent: 340338 (1886-04-01), Marshall
patent: 575851 (1897-01-01), Sly
patent: 1547254 (1925-07-01), McClure
patent: 2060953 (1936-11-01), Strom

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