Adjustable rungs for ladder

Details Adjustable rungs for ladder Adjustable rungs for ladder

1990-07-11

1991-10-29

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Rung or rung-to-stile connection

182194, E06C 708

Patent

active

050607570

ABSTRACT:
Adjustable cross pieces or rungs for aiding in forming a ladder using a tree cut at predetermined lengths and trimmed of branches. The cross members include two end members and a centrally located channel member which receives an elongated main body portion of the end members and which can be stabilized at the top and bottom rungs for securing the trees together and forming foot rests or rungs for the ladder.

REFERENCES:
patent: 1116073 (1914-11-01), Johnson et al.
patent: 1823509 (1931-09-01), Peters
patent: 1960863 (1934-05-01), Boyer
patent: 2599976 (1952-06-01), Carlson
patent: 2941617 (1960-06-01), Stiffler
patent: 3282378 (1964-09-01), Pierce
patent: 3380697 (1968-04-01), Melcher
patent: 3985204 (1976-10-01), Lattig
patent: 4289215 (1981-09-01), Robinson
patent: 4605097 (1986-08-01), Maxwell

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