Stairtread for spiral staircase

Details Stairtread for spiral staircase Stairtread for spiral staircase

1981-02-09

1984-03-27

Perham, Alfred C.

Static structures (e.g., buildings)

Stepped; e.g., stair

Helical type

52189, E04F 1102, E04F 1108

Patent

active

044386087

ABSTRACT:
Pie shaped stairtreads are mounted to a vertical column with spacers to provide a desired riser height. Each tread includes a tubular sleeve with a T-shaped frame welded to the sleeve. The frame extends peripherally of the pie shaped tread and includes two radially sides and a short arcuate segment welded to the outer radial ends opposite the tubular sleeve. The tread includes a perforated steel plate welded to the frame, which plate and frame are covered by a polyurethane foam. A railing rod can be mounted to the outer arcuate frame segment by bracket means clamped to the web of the T in either one of two positions for left hand or right hand stairway installations.

REFERENCES:
patent: 194580 (1877-08-01), Clark
patent: 580262 (1897-04-01), Dyer
patent: 1031645 (1912-07-01), Haskell
patent: 1215352 (1917-02-01), Duvinage
patent: 1726133 (1929-08-01), Wilson
patent: 3585769 (1971-06-01), Giuseppe
patent: 3713260 (1973-01-01), Brauckmann
patent: 4321294 (1982-03-01), Naka

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