Fire escape – ladder – or scaffold – Wall- or floor-attached – Wall-mounted platform – with ladder
Patent
1988-04-14
1989-07-18
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Wall-mounted platform, with ladder
182106, 182115, 182127, E06C 524
Patent
active
048485179
ABSTRACT:
A safety ladder particularly suited for permitting access to the top of a tank having a convex exterior surface is provided. The ladder is designed to provide a safe vertical path between the ground and a flat work platform attached to the ladder at the top of the tank. The safety of the tank ladder is enhanced by providing a pair of smooth, continuous, unbroken vertical handrails spaced outwardly of the ladder along which the tank operator can slide his hands without removing them from the rails from the top to the bottom of the ladder. Safety steps include spaced rung sections secured to vertical supports to define a central opening through which spilled liquids, rain or snow may drop instead of accumulating on the surface of the step as in prior art ladder steps. A central reinforcing bar extends between the rung sections to strengthen the steps. A flat platform is attached to the top of the ladder to form the top step of the ladder and to provide a safe work space at the curved top of the tank. Optional sidewalls and guardrails may be provided to enhance the safety of the platform.
REFERENCES:
patent: 1982865 (1934-12-01), Gross
patent: 2226489 (1940-12-01), Doherty
patent: 2318492 (1945-08-01), Fenner
patent: 2726123 (1955-12-01), Matthews
patent: 3112010 (1963-11-01), Mihalik
patent: 4044857 (1977-08-01), Guerette
patent: 4063616 (1977-12-01), Gutierrez
patent: 4316525 (1982-02-01), Gehlbach
patent: 4371056 (1983-02-01), Anglade
patent: 4572328 (1986-02-01), Benko
patent: 4603758 (1986-08-01), Pettit
patent: 4679657 (1987-07-01), Bennett
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