Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder
Patent
1989-12-04
1990-08-28
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
182155, 182223, 108115, E04G 134
Patent
active
049517813
ABSTRACT:
Scaffolding structure includes first and second frame members with adjacent connected ends and remote free ends. The connected ends are hingedly connected for relative rotation of the frame members about a hinge axis between a closed position in which the frame members overlap each other and an open position in which the frame members are continuations of each other. A first leg member is mounted on the first frame member adjacent its connected end, a second leg member is mounted on the first frame member adjacent its free end, and a third leg member is mounted on the second frame member adjacent its free end. The leg members are positioned to extend in the same direction from the frame members when the frame members are in the open position and are movable between retracted positions in which they are generally parallel to the frame members and extended positions in which they are generally perpendicular to the frame members. The hinge axis is provided by a hinge pin that is removable, so that the first frame member can be used separately from the second frame member.
REFERENCES:
patent: 1763766 (1930-06-01), Erwin
patent: 1912947 (1933-06-01), Martin
patent: 2394221 (1946-02-01), Waltz
patent: 2556611 (1951-06-01), Borgman
patent: 2593386 (1952-04-01), Dirks
patent: 2782075 (1957-02-01), Fagan
patent: 3250344 (1966-05-01), Romano
patent: 4046221 (1977-09-01), Edenfield
patent: 4089522 (1978-05-01), Rock
patent: 4249636 (1981-02-01), Jackson et al.
patent: 4298094 (1981-11-01), Strong
patent: 4576251 (1986-03-01), Matsuura et al.
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