Ladder with retractable rungs

Details Ladder with retractable rungs Ladder with retractable rungs

1978-02-06

1979-01-02

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

182100, 182 91, 182189, E06C 1387

Patent

active

041322886

ABSTRACT:
A ladder with retractable rungs is disclosed herein. The ladder includes an elongated housing having alternating apertures on opposite sides. A stem is carried in the housing. The stem can be manually reciprocated longitudinally and has a series of rungs hingedly attached to it. The rungs engage the apertures and extend outward to provide a step when the stem is moved upward. A supporting rod is pivotally connected inside the housing at its base so as to be swingable from a position to one side of the housing to a center position. The stem must be lifted when the supporting rod is moved to the center position, where the supporting rod then supports the stem with the rungs in the open position. A retaining rod is mounted pivotally inside the housing at the top of the stem. It is also swingable from one side to a center position where it prevents the stem from moving upward. The supporting and retaining rods are connected together by a control rod, and spaced apart vertically so that when one is in an engagement, the other is disengaged.

REFERENCES:
patent: 438036 (1890-10-01), Verstraete
patent: 646291 (1900-03-01), Krueger
patent: 928478 (1909-07-01), Smalley
patent: 1313444 (1919-08-01), Witherow
patent: 1831332 (1931-11-01), Wagner
patent: 2148099 (1939-02-01), Bray
patent: 2553438 (1951-05-01), Caduff

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