Foldable ladder structure and method of manufacturing the same

Details Foldable ladder structure and method of manufacturing the same Foldable ladder structure and method of manufacturing the same

1987-01-15

1989-05-30

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Ladder with pivoted prop

182152, 182180, 182 46, 182104, E06C 1383

Patent

active

048342165

ABSTRACT:
Foldable ladder structure and method of making the same wherein plastic material is injected and expanded in molds to form several parts of a foldable ladder which includes front and rear ladder sections that can be pivotally hinged at their upper portions, a collapsible shelf and spreader linkage to allow the sections to be relatively pivoted from collapsed face-to-face relation to erected position.

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patent: 4124093 (1978-11-01), Breisch
patent: 4228872 (1980-10-01), Treitz
patent: 4383488 (1983-05-01), Macho

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