Fire escape – ladder – or scaffold – Means maintaining step lever on horizontally pivoted ladder
Patent
1978-04-24
1979-09-25
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining step lever on horizontally pivoted ladder
182 96, E06C 906, E04F 1104
Patent
active
041687647
ABSTRACT:
Self adjusting stair walkway with double side handrailing keyed and hinged to opposed side bar hinge linkage configurations that have steps hinge supported in a manner that upon the main side bars being swung in an arc about its support hinge the steps remain level for practical use as a safe self supporting stairway suitable for pedestrian traffic from seventy-five degrees below the horizontal to sixty degrees above the horizontal then folds to an essentially vertical compactness upon reaching ninety degrees above the horizontal to a standby position. Opposed side gears hydraulically driven are provided for safely swinging the level step stairs that will hydraulically lock the stairs in a desired inclination whereupon controllable opposed ratchet and pawl configurations can safely and additionally lock the stairs in the position.
REFERENCES:
patent: 298212 (1884-05-01), Knight
patent: 1419834 (1922-06-01), Fellows
patent: 1944159 (1934-01-01), Bailey
patent: 4013140 (1977-03-01), Pradon
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