Two-speed ladder

Details Two-speed ladder Two-speed ladder

1980-06-12

1982-02-23

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Wall- or floor-attached

Ladder

182 99, 182106, 182194, 52182, E06C 902, E06C 708

Patent

active

043165249

ABSTRACT:
A ladder which can be ascended and descended at either of two rates and which comprises an array of half treads on one side of a stringer and an array of full treads on the opposite side of the stringer, each array being vertically spaced from the other along the length of the stringer. Treads are affixed to and extend from respective sides of the stringer, and at least one of the arrays includes outwardly extending portions affixed to a handrail.

REFERENCES:
patent: 234389 (1880-11-01), Cannon
patent: 858199 (1907-06-01), Modjeski
patent: 2641401 (1953-06-01), James
patent: 4061202 (1977-12-01), Campbell
patent: 4125175 (1978-11-01), Ernst
patent: 4199040 (1980-04-01), Lapeyre

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