Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder
Patent
1993-02-01
1994-09-27
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Collapsible ladder
182207, E06C 112
Patent
active
053500385
ABSTRACT:
A foldable extension ladder includes first and second ladder sections; each ladder section including a three foldable sections, each foldable section including a pair of end rails and a plurality of transverse rungs connecting the pair of end rails in a parallel, spaced apart relation, hinges for hingedly connecting together the three foldable sections in end to end relation for movement between an in-line configuration and a folded configuration in which all of the foldable sections are arranged in a substantially parallel, overlaying relation with each other, each hinge including a pivot pin pivotally connecting ends of two adjacent foldable sections, the pivot pins of all hinges of the first ladder section being arranged to a first side of the first ladder section, when the first ladder section is in the in-line configuration, the pivot pins of all hinges of the second ladder section being arranged to a first side of the second ladder section, when the second ladder section is in the in-line configuration, and a pivoted hook assembly releasably locking each hinge in a fixed position when two foldable sections at opposite ends of each hinge are arranged in the in-line configuration; and the end rails of the first and second ladder sections being slidably connected together in the lengthwise direction of the ladder, at second, opposite sides of the first and second ladder sections such that the first and second ladder sections are fully slidable with respect to each other.
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Chin-Shue Alvin C.
Goldberg Richard M.
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