Fire escape – ladder – or scaffold – Means maintaining step lever on horizontally pivoted ladder
Patent
1976-05-25
1977-10-11
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining step lever on horizontally pivoted ladder
182 16, 182 28, 182129, E06C 1393, E06C 1397
Patent
active
040530280
ABSTRACT:
Apparatus for use as a stairway, stepladder and the like has a pair of upper stringers and a pair of lower stringers, all connected at one end to a top structure; and a series of treads, each of which is pivoted to the upper and lower stringers. The axes of articulation associated with the upper stringers are offset vertically from those associated with the lower stringers so that the stringers may be swung about their points of connection with the top structure, without the treads deviating from the horizontal into a horizontal position of the stringers, in which the upper stringers rest on the lower stringers. Support elements are articulated to the top structure, and an automatic latching apparatus is provided to interconnect the support members with the stringers.
REFERENCES:
patent: 1419834 (1922-06-01), Fellows
patent: 1945531 (1934-02-01), Kramer
patent: 2865546 (1958-12-01), Shull
patent: 2978062 (1961-04-01), DiCamillo
patent: 3104889 (1963-09-01), Branch
patent: 3954155 (1976-05-01), Guidara
patent: 3961809 (1976-06-01), Clugston
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Machado Reinaldo P.
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