Ladder locking mechanism

Details Ladder locking mechanism Ladder locking mechanism

1984-04-16

1986-03-11

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

182211, E06C 1383

Patent

active

045749183

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 which when the ladder is extended and open.

REFERENCES:
patent: 409711 (1889-08-01), Sickles
patent: 974018 (1910-10-01), Binckley
patent: 2499091 (1950-02-01), Brubaker
patent: 2976070 (1961-03-01), Gollbach
patent: 3948352 (1976-04-01), Larson
patent: 4423797 (1984-01-01), Batten
patent: 4448283 (1984-05-01), Marques
patent: 4457391 (1984-07-01), Marques

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