Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1980-06-02
1982-05-11
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182 99, 182106, 182194, 52187, E06C 902, E06C 708
Patent
active
043288804
ABSTRACT:
A circular ladder for use along a cylindrical wall and having a single stringer which is disposed in a helical path around the cylindrical wall and an array of half treads disposed on each side of the stringer. Each array of half treads is vertically spaced from the other along the length of the stringer, the half treads being affixed to and laterally extending from the respective sides of the stringer. Each half tread includes an outwardly extending portion which terminates in a plane which is forward of a plane passing through the front edges of the treads. First and second handrails are disposed in this forward plane and affixed to the outwardly extending tread portions. In an alternative embodiment, a single outside handrail is employed, the cylindrical wall providing a body support in place of an inside handrail.
REFERENCES:
patent: 2085839 (1937-06-01), Van Dyke
patent: 4199040 (1980-04-01), Lapeyre
patent: 4215766 (1980-08-01), Littlefield
Machado Reinaldo P.
The Laitram Corporation
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