Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder
Patent
1992-09-25
1993-07-20
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Collapsible ladder
182 22, 403 96, E06C 700
Patent
active
052285359
ABSTRACT:
A folding ladder comprising multiple ladder sections pivotally joined together to permit the ladder to be articulated into and locked in a variety of configurations. Each ladder section includes a pair of side rails and a plurality of spaced rungs. The ladder end sections are identical and interchangeable. The ladder middle sections are identical and interchangeable. All side rails are reinforced by steel rods. The ladder sections are hinged together at their ends along one side of the ladder by master-type pivots and are hinged together at their ends along the opposite side of the ladder by slave-type pivots. Master pivots may be adjusted to a first position allowing the ladder sections to be moved with a denting action and to a second position locking the ladder sections together in a selected position. Slave pivots follow the action of the master pivots, allowing all ladder adjustments to be made from one side. Side rails and rungs of each ladder section are formed integrally from resin impregnated glass fibers in a single molding operation. Only two different mold forms are required. An adjustable leveler is provided for legs of the end ladder section.
REFERENCES:
patent: 4216844 (1980-08-01), Klafs
patent: 4407045 (1983-10-01), Boothe
patent: 4666328 (1987-05-01), Ryu
patent: 4773503 (1988-09-01), Purkapile
patent: 4927959 (1990-08-01), Yuen
patent: 5163532 (1992-11-01), McCarty
Bloom Leonard
Chotkowski Karen J.
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