COLLAPSIBLE LADDER

A relatively simple, lightweight, 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 condition. In the extended condition, torsion spri...

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Bibliographic Details
Main Author CHAO, PATRICK
Format Patent
LanguageEnglish
French
Published 13.03.1990
Edition4
Subjects
DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL
FIXED CONSTRUCTIONS
LADDERS
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Summary:A relatively simple, lightweight, 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 condition. 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.
Bibliography:Application Number: CA19880572499