Fire escape – ladder – or scaffold – Horizontal traversing - actuation – control – or response – Holding means
Patent
1993-10-25
1995-05-02
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Horizontal traversing - actuation, control, or response
Holding means
182116, E04G 300, E06C 500
Patent
active
054111110
ABSTRACT:
A rolling platform ladder includes a frame supporting a stairway and a flat work platform area at the top of the stairway. The frame includes a base portion that has a cantilevered front area for preventing tipping over if the platform is overloaded. A main structural support column is placed at the center portion of the platform and extends down at an angle toward the rear of the base. At least a portion of the platform is positioned in front of the column during use. This configuration enables at least a portion of the platform to be positioned over machines, conveyors and over obstructions. A portion of the base extends in front of the frame so that it can extend under objects elevated slightly above a work surface such as an elevated conveyor or machine.
REFERENCES:
patent: 2362170 (1944-11-01), Swaisgood
patent: 2798652 (1957-07-01), Easton
patent: 2923373 (1960-02-01), Ledgerwood
patent: 3155190 (1964-11-01), Borgman
patent: 3664458 (1972-05-01), Sterns et al.
patent: 4044857 (1977-08-01), Guerette
McMaster-Carr Supply Company Catalog, pp. 1174-1175.
Chotkowski Karen J.
The Laitram Corporation
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