Static structures (e.g. – buildings) – Stepped; e.g. – stair – Tread unit on horizontal tread member connected to riser
Patent
1983-05-13
1986-06-10
Perham, Alfred C.
Static structures (e.g., buildings)
Stepped; e.g., stair
Tread unit on horizontal tread member connected to riser
52182, 52183, 52741, E04F 1100
Patent
active
045935033
ABSTRACT:
Several horizontal links have inward-projecting horizontal flanges for supporting the treads of a stairway. Such links are uniformly spaced apart elevationally by upright parallel links pivoted to the horizontal links to form a lazy tongs linkage. One such lazy tongs linkage is permanently attached in inclined attitude to the conventional weight-bearing supports for the stair treads, such as sidewalls or inclined stringers, at each side of the rough opening for the stairway. Prior to permanent installation, the lazy tongs linkage can be extended or contracted by conjoint swinging of the upright links to adjust the spacing of the horizontal tread support flanges so that the total rise of the linkage matches the total rise between adjacent floors as actually constructed. The support is designed to fit a range of expected total rises between the adjacent floors while maintaining a rise and run for each step within acceptable limits.
REFERENCES:
patent: 1128212 (1915-02-01), Woolard
patent: 2245825 (1941-06-01), Ross
patent: 2575615 (1951-11-01), Crump
patent: 2879556 (1959-03-01), Lyons
patent: 3626438 (1971-12-01), Cornell
patent: 3885365 (1975-05-01), Cox
patent: 3962838 (1976-06-01), Cox
patent: 4020920 (1977-05-01), Abbott
patent: 4124957 (1978-11-01), Poulain
Beach Robert W.
Brown Ward
Perham Alfred C.
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