Combination extension and step ladder rungs therefor

Details Combination extension and step ladder rungs therefor Combination extension and step ladder rungs therefor

1978-03-13

1980-01-08

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Convertible

Ladder

182167, 182228, E06C 118, E06C 132

Patent

active

041824318

ABSTRACT:
A combination step and extension ladder is disclosed. Hinges are provided on each of the side rails of the ladder so that the ladder may be folded and unfolded from a step ladder configuration to a straight extension ladder configuration and vice versa. Additional side rails are provided which are telescopically mounted so that the ladder can be extended to increase its height in either of the step ladder or extension ladder configurations. Each of the ladder rungs are provided with two flat stepping surfaces which are symmetrically angularly oriented with respect to the side rails of the ladder so that at least one of the surfaces of each rung will present an essentially horizontal stepping surface whenever the ladder is in an upright position, either as a step ladder or as an extension ladder, and irrespective of which end of the side rails the ladder is standing on.

REFERENCES:
patent: 745320 (1903-12-01), Bruno
patent: 3085651 (1963-04-01), Rich
patent: 3692143 (1972-09-01), Kummerlin

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