Fire escape – ladder – or scaffold – Wall- or floor-attached – Ladder
Patent
1982-07-26
1985-08-20
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Ladder
182194, 182228, 52182, E06C 902, B63B 2920
Patent
active
045358710
ABSTRACT:
A stair or ladder which has a central stringer adapted for mounting between an upper level and a lower level at a relatively steep angle of inclination, and a plurality of tread members disposed in alternating arrangement on respective sides of the stringer, each of the tread members having a foot support portion outwardly extending from the stringer. A pair of handrails is disposed substantially in a plane forward and parallel to a plane passing through the front edges of the foot support portions and positioned with respect to the foot support portions to provide support of the user. The tread members are substantially identical, except for the top tread and bottom tread of the stairway and include a foot support portion and an outwardly extending support adapted for connection to a rail. The stairway is preferably composed of components preformed of aluminum and welded together to provide a completed structure which is relatively light weight, rigid, and strong.
REFERENCES:
patent: 118632 (1871-08-01), Morse
patent: 1215352 (1917-02-01), Durinage
patent: 2466155 (1949-04-01), Conrad
patent: 4044857 (1977-08-01), Guerette
patent: 4143740 (1979-03-01), Mathews
patent: 4199040 (1980-04-01), Lapeyre
patent: 4333547 (1982-06-01), Johansson
Chin-Shue Alvin
Machado Reinaldo P.
The Laitram Corporation
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