Fire escape – ladder – or scaffold – Ladder with pivoted prop – Coplanar extension with prop pivoted to lower section
Patent
1990-03-02
1991-07-23
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder with pivoted prop
Coplanar extension with prop pivoted to lower section
182208, E06C 130, E06C 704
Patent
active
050335847
ABSTRACT:
An all purpose ladder includes a fixed base ladder segment that is conventionally made with long side pieces that are connected together by rungs or steps. An upper ladder segment comprises a pair of long side pieces connected together by rungs. As is conventional with extendible ladders, the side pieces of the upper ladder segment are in sliding engagement with the side pieces of the base ladder segment. A screw or worm shaft is rotatably mounted to one side piece of the lower ladder segment and a threaded bracket engages both the upper ladder segment and the screw or worm shaft such that when the screw or worm shaft is rotated about its longitudinal axis, the bracket travels along the length of the screw or worm shaft, thereby moving the upper segment relative to the fixed base ladder segment. Gears and a handle are provided so that a user can adjust the relative extension position between the base ladder segment and the upper ladder segment on a continuous basis. Struts or legs pivotably extend from an upper part of the base ladder segment to the ground to provide a triangular support structure such that the ladder may be freestanding. When standing vertically, the sliding ladder segment can be raised until it contacts a ceiling. Also, objects can be held against the ceiling by pressing them upwardly with the ladder. Loads can be elevated by being placed on or attached to the sliding upper ladder segment before it is raised. A pair of all-purpose ladders may be used like a scaffold by putting a platform between them.
REFERENCES:
patent: 375250 (1887-12-01), Bailey
patent: 886737 (1908-05-01), Taylor
patent: 1077650 (1913-11-01), Stroud
patent: 1423104 (1922-07-01), Glasser
patent: 1986477 (1935-01-01), Kenyon
patent: 2650750 (1953-09-01), Chesney
patent: 2880920 (1959-04-01), Glessner
patent: 2992696 (1961-07-01), Jedinak
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