Circular stairway and method of making same

Details Circular stairway and method of making same Circular stairway and method of making same

1996-02-06

1997-05-27

Smith, Creighton

Static structures (e.g., buildings)

Stepped; e.g., stair

Helical type

527412, 182187, E04F 1100

Patent

active

056321244

ABSTRACT:
A circular stairway and method of making same, including a helical newel formed by installing a cylindrical tube or pipe with its longitudinal axis concentric with the vertical axis about which the circular staircase is to wind. The treads are then affixed to the tube in either cantilever fashion or are bridged between the tube and an outer wall. The tube is subsequently cut along helically extending lines disposed beneath the tread line and at approximately the handrail elevation. The tube material between these lines is then removed to leave a helically extending ribbon of tube material forming the tread supporting helical newel. As an alternative, the several components of the stairway can be pre-fabricated and transported to a site for assembly.

REFERENCES:
patent: 415078 (1889-11-01), Wagner
patent: 4190992 (1980-03-01), Takenaga
patent: 4338751 (1982-07-01), Sanders
patent: 4413460 (1983-11-01), Gerlach
patent: 4527367 (1985-07-01), Morellini
patent: 4587780 (1986-05-01), Rorke
patent: 4850164 (1989-07-01), McLeod
patent: 4918799 (1990-04-01), Benedetti
patent: 5058339 (1991-10-01), Krstovic

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