Fire escape – ladder – or scaffold – Safety device for ground-supported ladder
Patent
1983-11-15
1985-05-28
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Safety device for ground-supported ladder
182172, 182200, E06C 536, E06C 744, E06C 108
Patent
active
045194777
ABSTRACT:
An adjustable stablizing device which is attached to an extension ladder having hollow rungs without requiring modification of the ladder structure or affecting normal operation of the ladder is described. The device has two stabilizing elements made of aluminum which are located at different side of the ladder. Each stabilizing element has an upper and a lower bracket which are connected together by two rigid pivotably-linked longitudinal members. The stabilizing elements are connected to each other by rods which extend through the hollow rungs of the ladder and which connect the upper and the lower brackets. The lower bracket and the lower longitudinal member are pivotably connected, and the upper bracket has a number of apertures spaced lengthwise of the ladder. By choosing the aperture to which the upper longitudinal member is connected, the attitude of each of the lower members is varied via the pivotable connection so as to lie on the surface adjacent the ladder side. When not in use, the stabilizing elements are retained flush against the sides of the ladder for storage.
REFERENCES:
patent: 1385319 (1921-07-01), Enke
patent: 2423477 (1947-07-01), Brimboeuf
patent: 3012628 (1961-12-01), Zumbaum
patent: 3025926 (1962-03-01), Vives
patent: 3618703 (1971-11-01), Wilke
patent: 3856112 (1974-12-01), Stewart
patent: 4147231 (1979-04-01), Chantler
patent: 4175641 (1979-11-01), Reyes
patent: 4244446 (1981-01-01), Mair
patent: 4311207 (1982-01-01), Lurry
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