Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder
Patent
1987-12-14
1988-11-22
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Collapsible ladder
182220, E06C 1383
Patent
active
047859121
ABSTRACT:
A folding ladder of the type made up of a pair of side rails to which rungs are pivoted at opposite ends for folding of the structure from an open mode, in which the rungs are horizontal, to a closed or folded mode in which the rails move lengthwise relative to each other as well as toward each other as the rungs pivot about their respective pivots, parallel-link fashion. The present improvement resides in the design of each rail in semi-circular section in which the open side of the C thus formed faces inwardly toward the open side of the C of the other rail, whereby, in the closed mode, the two rails form a cylindrical shell within which the rungs are housed or confined, leading to a compact package that is easily carried, shipped, etc.
REFERENCES:
patent: 256990 (1882-04-01), Fish
patent: 646987 (1900-04-01), Herrick
patent: 804494 (1905-11-01), O'Hearne
patent: 1140281 (1915-05-01), Otto
patent: 1401526 (1921-12-01), Saussure
patent: 1631922 (1927-06-01), Curtis
patent: 3901354 (1975-08-01), Grebausky
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