Convertible fold-up ladder

Details Convertible fold-up ladder Convertible fold-up ladder

1983-09-29

1985-01-15

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Convertible

Ladder

182164, 182196, 182211, E06C 1383

Patent

active

044933924

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 progressively 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: 1644739 (1927-10-01), McCracken
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), Kummerlin

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