Prefabricated stair construction

Details Prefabricated stair construction Prefabricated stair construction

1974-12-06

1976-09-21

Bell, J. Karl

Static structures (e.g., buildings)

Stepped; e.g., stair

With additional building feature

52189, E04F 1100, E04F 1118

Patent

active

039811123

ABSTRACT:
A prefabricated stair construction consisting of a pair of spaced, parallel stair stringers, either one or both being a free span member between support beams with developed strength of a rigid truss by the joining of stair rails, balusters and stringer into a single unit. The stringers are joined together by a plurality of precast treads secured at each end to the stringer by two welded flanges, the treads having a reinforced nose portion and riser to decrease the bending moment of the tread.

REFERENCES:
patent: 1861751 (1932-06-01), Nicols
patent: 1870598 (1932-08-01), Amann
patent: 2703005 (1955-03-01), Dobermann
patent: 3672106 (1972-06-01), Multiz
patent: 3875708 (1975-04-01), Thorsnes

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