Fire escape – ladder – or scaffold – Unitary foldable – rigid scaffold or ladder – Collapsible ladder
Patent
1992-01-21
1992-10-27
Johnson, Blair M.
Fire escape, ladder, or scaffold
Unitary foldable, rigid scaffold or ladder
Collapsible ladder
182156, E06C 100
Patent
active
051581515
ABSTRACT:
A step ladder which folds with respect to a width and a depth thereof. Two sets of unidirectionally foldable steps are pivotally attached between two pairs of side rails, and 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. A head step is disposed on a top of the ladder and is pivotal in the two directions of the step ladder. When the ladder is folded with respect to its width, the step 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. A retaining assembly prevents the ladder from unfolding.
REFERENCES:
patent: 958732 (1910-05-01), 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), Mucelli
patent: 4842099 (1989-06-01), Collet et al.
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