Fire escape – ladder – or scaffold – Convertible
Patent
1985-09-06
1986-09-23
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Convertible
182164, 182196, 182206, E06C 1383, E06C 152, E06C 708
Patent
active
046130136
ABSTRACT:
A suspension ladder comprises a string of identical rigid rectangular sections (1) which are hinged together about a series of parallel axes adjacent their longer rear edges (2), and each of which has one or more apertures (11) forming a rung of the ladder. Each section (1) has a trapezoidal cross sectional profile providing the section with sloping top and bottom edge faces (4) and (5) which converge towards the front face (6) from the longitudinal rear edges (2) and form stops which limit the extent to which adjoining sections can pivot towards each other in a forward direction. The ladder therefore cannot be flexed in this direction beyond a predetermined minimum radius of curvature and will therefore form a substantially rigid cradle (21) when its lower end is lifted while its upper end is suspended. In contrast adjacent sections can pivot flat against each other in the rearward direction so that the ladder can be rolled up tightly for easy storage.
REFERENCES:
patent: 277222 (1883-05-01), Bush
patent: 288455 (1883-11-01), Landes
patent: 2998863 (1961-09-01), Larson
patent: 3139949 (1964-07-01), Graves
patent: 3295269 (1967-01-01), Schuster
patent: 3397546 (1968-08-01), Eisert
patent: 3744591 (1973-07-01), Lucci
patent: 4023647 (1977-05-01), Confer
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