Portable and collapsible stair

Details Portable and collapsible stair Portable and collapsible stair

1986-06-06

1987-12-08

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

With handrail or guard for ladder

182156, E06C 1383

Patent

active

047112824

ABSTRACT:
A portable and collapsible stair which provides support platforms that are spaced laterally and vertically from one another at approximately a one-to-one slope, thus enabling a person to ascend or descend the stair in a more convenient walking motion. There are two inverted U-shaped cross members pivotally connected to one another at a pivot axis intermediate the ends of the legs of the two U-shaped members. An upper support platform extends between the upper ends of the two inverted U-shaped members. There are one or more additional support platforms extending horizontally from forwardly positioned lower leg portions of one of the U-shaped members.

REFERENCES:
patent: 362379 (1887-05-01), Henry
patent: 1222673 (1917-04-01), Rizzo
patent: 1406888 (1922-02-01), Pandolfo
patent: 2217658 (1940-10-01), Puy
patent: 2643925 (1953-06-01), Derman
patent: 2871075 (1959-01-01), Stone
patent: 3058544 (1962-10-01), Rossi
patent: 3166028 (1965-01-01), Zagel
patent: 3547225 (1970-12-01), Deane
patent: 3999629 (1976-12-01), Schaffer
patent: 4425984 (1984-01-01), Lachance

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