Method of manfacturing a foldable ladder structure

Details Method of manfacturing a foldable ladder structure Method of manfacturing a foldable ladder structure

1989-11-15

1991-04-09

Simmons, David A.

Metal working

Method of mechanical manufacture

Assembling or joining

295271, 264 41, 2643288, B29C 6722

Patent

active

050052802

ABSTRACT:
A method of making foldable ladder structure 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: 4722821 (1988-02-01), Vermilye
patent: 4806293 (1989-02-01), Akitama et al.
patent: 4806405 (1989-02-01), Liebl

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