Convertible ladder

Details Convertible ladder Convertible ladder

1979-02-12

1981-08-18

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Convertible

Ladder

182 27, 182119, E04G 130, E06C 132

Patent

active

042841712

ABSTRACT:
A convertible ladder is provided which can be set up as an extension ladder, a step ladder or a trestle. A pair of leg assemblies each have a pair of sides connected by a plurality of rungs. Each leg assembly has regularly spaced hooks along its length which engage with the end lugs of a plank member. The plank member has arms provided with lugs which engage another pair of hooks on each leg assembly to form a trestle. The leg assemblies are also provided with a pair of upturned hook lugs which engage a rung of the other leg to form an extension ladder. In the step ladder configuration, the leg assemblies are maintained at maximum angular relationship by means of ties pivotally connected to one leg assembly with openings to engage pins on the other leg assembly.

REFERENCES:
patent: 212050 (1879-02-01), Phillips
patent: 1207552 (1916-12-01), Hill
patent: 2656223 (1953-10-01), Gray
patent: 3108657 (1963-10-01), Carlson
patent: 3566990 (1971-03-01), Fredricks

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