Method of forming a ladder

Details Method of forming a ladder Method of forming a ladder

2009-05-11

2010-12-21

Del Sole, Joseph S (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S046400

Reexamination Certificate

active

07854869

ABSTRACT:
A method for forming a ladder including: forming first and second expandable members used in constructing the ladder, the forming of each of the first and second expandable members which includes; expanding a covering to define a cavity; expanding foam in the cavity in an expansion direction to expand the covering into a predetermined shape; and connecting the first and second expandable members together by disposing a plurality of rungs therebetween.

REFERENCES:
patent: 2921645 (1960-01-01), Morrow et al.
patent: 5203427 (1993-04-01), Williams et al.

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