Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder
Patent
1992-05-04
1993-03-23
Johnson, Blair M.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Collapsible ladder
182159, 182160, E06C 100
Patent
active
051956101
ABSTRACT:
A step ladder which folds with respect to a width and a depth thereof. A set of unidirectionally foldable steps is pivotally attached between a pair of side rails, and an extendible cross-bracing assembly is disposed between another pair of side rails. Foldable spreaders are pivotally attached between opposing side rails. Each step has two halves, and a brace is pivotally attached to each half. A translation assembly is disposed in each side rail to which each brace is attached. When the ladder is folded with respect to its width, the steps fold upward, drawing the braces upward by means of the translation assembly. When the ladder is folded with respect to its depth, the spreaders are folded, resulting in a completely folded ladder with the steps and the braces substantially contained within the side rails. A locking assembly is disposed between the side rails for preventing the ladder from folding.
REFERENCES:
patent: 958732 (1900-05-01), Dennis
patent: 1054108 (1913-02-01), Garraway
patent: 1371125 (1921-03-01), Speckman, Jr.
patent: 3084760 (1963-04-01), Lamberti
patent: 4560030 (1985-12-01), Macelli
patent: 4842099 (1989-06-01), Collet et al.
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