Fold-up ladder

Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder

Patent

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Details

182211, 182196, E06C 1383

Patent

active

044573910

ABSTRACT:
A portable folding ladder comprising a plurality of U-shaped modules having a rung and two vertical portions, the modules movable connected to each other, and when opened becoming progressible narrower as they approach the top of the ladder, when folded the narrower modules fitting inside of the next wider modules and locking means to lock the modules in a rigid manner when the ladder is extended and open.

REFERENCES:
patent: 303884 (1884-08-01), Reisener
patent: 308179 (1884-11-01), Linnenbrink
patent: 311661 (1885-02-01), Joyut
patent: 1228248 (1917-05-01), Rudd
patent: 1644739 (1927-10-01), McCracken
patent: 1722844 (1929-07-01), Faulkenberry
patent: 2529112 (1950-11-01), Steele
patent: 3216526 (1965-11-01), Cole
patent: 3554318 (1971-01-01), Knight
patent: 3655012 (1972-04-01), Hoffmann
patent: 3730295 (1973-05-01), Deese
patent: 3811151 (1974-05-01), Kuemmerlin

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