Spiral staircase arrangement

Details Spiral staircase arrangement Spiral staircase arrangement

1986-02-18

1987-04-28

Perham, Alfred C.

Static structures (e.g., buildings)

Stepped; e.g., stair

Helical type

E04F 1110, E04F 1118

Patent

active

046603352

ABSTRACT:
A round or spiral staircase is formed from post pieces and treads with the treads each having a collar portion which cooperates with the post pieces to form a complete post. The collars are rotatable relative to the post portions to allow the treads to be aligned for transportation. The post portions and collars are clamped together by a longitudinal screw with end caps closing the end post portions. The upper end cap has an opening therein so that a pourable settable liquid reinforced with glass-fiber can be poured down the hole post with the treads arranged spirally to integrate the collars and post portions into a complete rigid post.

REFERENCES:
patent: 1726133 (1929-08-01), Wilson
patent: 3585769 (1971-06-01), Guiseppe
patent: 3667176 (1972-06-01), MacKay
patent: 4338751 (1982-07-01), Sanders

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