Access ladder with plungers

Details Access ladder with plungers Access ladder with plungers

2010-06-10

2011-10-04

Chin-Shue, Alvin C (Department: 3634)

Fire escape, ladder, or scaffold

Ladder

Slidable nested single rung units

C182S077000, C182S211000

Reexamination Certificate

active

08028805

ABSTRACT:
An access ladder for accessing a ceiling from a floor. The ladder comprises a plurality of sections which telescope open and closed, and from a bottom section each section telescopes open to positively lock to the section below it with plungers that lock and unlock each section in sequence as the sections open and close, respectively. A method for using an access ladder for accessing a ceiling from a floor.

REFERENCES:
patent: 2993561 (1961-07-01), Watson
patent: 3061042 (1962-10-01), Giles
patent: 4429766 (1984-02-01), Alimbau Marques
patent: 4457391 (1984-07-01), Alimbau Marques
patent: 5495915 (1996-03-01), Weston et al.
patent: 6886661 (2005-05-01), Battenberg
patent: 2004/0195043 (2004-10-01), Johansson

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