Electric ladder

Details Electric ladder Electric ladder

1990-09-24

1992-09-08

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Platform with elevating or lowering means

182194, 182228, 182103, E06C 712

Patent

active

051450313

ABSTRACT:
An adjustable ladder comprising, a pair of side supports, a device for retaining the supports in a spaced relationship, a rung, a device for slidably mounting the rungs in the supports, and a device for moving the rung along the supports for adjusting the position of the rung.

REFERENCES:
patent: 2880920 (1959-04-01), Glessner
patent: 3088123 (1963-05-01), Loughridge
patent: 3196981 (1965-07-01), Winnall
patent: 3799289 (1974-03-01), Cecere
patent: 4049081 (1977-09-01), McDonald
patent: 4427094 (1984-01-01), Winkelblech

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