Longitudinally variable ladder

Details Longitudinally variable ladder Longitudinally variable ladder

1979-01-05

1980-07-01

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Extension

182 23, 182166, E06C 122, E06C 706

Patent

active

042102243

ABSTRACT:
A longitudinally variable ladder with at least two ladder parts which are displaceable relative to one another in their longitudinal direction, one part of which with its two struts forms a guide for the struts of the other part, which latter struts engage between the former struts, and the rungs, which are connected with the outer struts, lie on the front side of these struts, the rungs which are connected with the inner struts lying between the two planes which are defined by the front side and the rear side of these struts. The struts of all ladder parts have the same box profile, and the inner struts are guided between at least those two rungs of the outer struts which lie in the upper end section of these struts, from which upper end section the other ladder part is able to be pulled out, and guide rails, the guide rails being limited to the end section which carries the two rungs and in this end section at least indirectly engage on the rear side of the outer struts.

REFERENCES:
patent: 470515 (1892-03-01), Skeels
patent: 697294 (1902-04-01), Totman
patent: 1461952 (1923-07-01), Walchli
patent: 2210803 (1940-08-01), Dunn
patent: 3692143 (1972-09-01), Kummerlin

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