Fire escape – ladder – or scaffold – Ladder with pivoted prop – Lateral prop
Patent
1994-03-24
1995-10-03
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder with pivoted prop
Lateral prop
182107, E06C 122
Patent
active
054544467
ABSTRACT:
A freestanding extension ladder is disclosed which has lower and upper ladder sections joined together in slidable relation such that the upper ladder section is extensible above the lower ladder section and retractable to be generally coextensive with the lower ladder section. A longitudinal bracing frame having a length generally corresponding to the length of the lower ladder section has its upper end attached to the upper end of the lower ladder section and extends downward and longitudinally outward therefrom. Transverse base members are mounted to the lower end of the lower ladder section and the longitudinal bracing frame and extend laterally therefrom. A pair of spars have upper ends attached one to either side of the lower ladder section at its upper end and extend downward and laterally outward therefrom. The resulting ladder is free standing yet extensible to permit access to locations which are higher than conventional step ladders but which lack a suitable surface against which the upper end of a conventional extension ladder can be braced.
REFERENCES:
patent: 105126 (1870-07-01), Pullman
patent: 1359297 (1920-11-01), Voss
patent: 1670653 (1928-05-01), Cummins
patent: 3059723 (1962-10-01), Shore
patent: 3288248 (1966-11-01), Gurian et al.
patent: 4004652 (1977-01-01), Laboy
patent: 4172641 (1979-11-01), Reyes
patent: 4630819 (1986-12-01), Levin
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