Step ladder for stairs

Details Step ladder for stairs Step ladder for stairs

1986-08-27

1988-01-19

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

182 24, 182166, E06C 128

Patent

active

047199903

ABSTRACT:
A step ladder for stairs has a rear support member for providing a climbing structure, a front support member for retaining the rear support member in a substantially erect position, the front support member being hinged connected to the rear support member and including an upper portion with a bottom end and a lower portion, and a hinge assembly for hinged connecting the upper and lower portions together. The hinge assembly permits folding of the front support member so that the bottom end of the upper portion can rest on a first surface which is raised above a second surface whereupon the rear support member rests. The hinge assembly may have a first locking assembly to secure the upper and lower portions in an unfolded position and a second locking assembly to secure the upper and lower portions in a folded position.

REFERENCES:
patent: 383243 (1888-05-01), Peacock
patent: 646347 (1900-03-01), Betty
patent: 1479628 (1924-01-01), Seger
patent: 1648844 (1927-11-01), Frisk
patent: 1936508 (1933-11-01), Hanly et al.
patent: 2012592 (1935-08-01), Skiba
patent: 3143185 (1964-08-01), Wenger
patent: 3554318 (1971-01-01), Knight

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