Double extendible or support ladder

Details Double extendible or support ladder Double extendible or support ladder

1979-05-21

1981-03-17

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Convertible

Ladder

182162, E06C 1383

Patent

active

042562007

ABSTRACT:
A step ladder with rungs which can be retracted and transformed, without dismantling, into a folded ladder and an extension ladder.

REFERENCES:
patent: 193081 (1877-07-01), Gay
patent: 798388 (1905-08-01), Bodendieck
patent: 860065 (1907-07-01), Scott
patent: 958732 (1910-05-01), Dennis
patent: 4016954 (1977-04-01), Hickman
patent: 4027741 (1977-06-01), Derrick

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