Collapsible ladder

Details Collapsible ladder Collapsible ladder

1988-11-30

1989-12-05

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

182 41, 182196, 182219, E04C 1383

Patent

active

048846597

ABSTRACT:
A relatively simple, lighweight, portable, collapsible ladder includes a plurality of H-shaped sections pivotally interconnected end-to-end to define a flat bundle in the stored or non-use condition. The sections can be unfolded to a flat, extended conditions. In the extended condition, torsion springs cause the sides of the sections to fold inwardly to define side bars having U-shaped cross sections. By reversing the process, the ladder can readily be restored to the folded, storage condition.

REFERENCES:
patent: 277222 (1883-05-01), Bush
patent: 2461429 (1949-02-01), Larson
patent: 2806562 (1957-09-01), Harman
patent: 3053358 (1962-09-01), Gross
patent: 3295269 (1967-01-01), Schuster

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