Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder
Patent
1990-07-06
1992-03-31
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
182230, E04G 100
Patent
active
050999532
ABSTRACT:
A foldable scaffold includes a frame and one or more planks for supporting one or more workmen. The frame comprises two generally vertically extending end ladders and a horizontally extending truss portion. The truss portion includes three pivotally connected elements to permit collapsing or folding of the scaffold for ease in transportation to a job site. The truss portion includes two, similar truss end members that are pivotally connected to the end ladders and a central locking gate element. The locking gate is pivotally connected to the inner ends of the two truss end portions and includes means for locking the central gate and end portion in a straight horizontal position to maintain the truss in a fully extended position. A plurality of connectors permit vertical stacking of one or more of the foldable scaffolds and the workmen's supporting planks are removably mounted to the tops of the end ladders when the truss portion is in its fully extended, locked position. A plurality of casters are provided to facilitate movement and positioning of the extended scaffold.
REFERENCES:
patent: 2852145 (1958-09-01), Scholz
patent: 3011586 (1961-12-01), Harvey, Jr.
patent: 3221837 (1965-12-01), Fisher
patent: 3266503 (1966-08-01), Hoiness et al.
patent: 3392801 (1968-07-01), Gethmann
patent: 3747898 (1973-07-01), Warren
patent: 4155424 (1979-05-01), Johnson
patent: 4534447 (1985-08-01), Champigny
patent: 4609071 (1986-09-01), Edwards
Genie Industries, "Genie Quik-Step", Jun. 1984.
Chotkowski Karen J.
Staghorn Products
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