Fire escape – ladder – or scaffold – Convertible – Ladder
Patent
1984-04-04
1985-06-04
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Convertible
Ladder
182156, 182168, E06C 120, E06C 1383
Patent
active
045208964
ABSTRACT:
A ladder including a lower step section and a strut pivotally connected together at their upper ends for swinging movement between a collapsed position toward each other and a downwardly divergent erected position, an upper step section pivoted to the upper end of the lower step section for swinging movement between a folded position along the lower step section and an erected position inclining as an extension of the lower step section, and a catch pivotally connected to the upper step section for swinging movement between a gravitationally depending retracted position along the upper step section when the ladder is folded to a gravitationally depending position from the upper step section to hooked engagement with a lug on the lower step section when the upper step section is extended.
REFERENCES:
patent: 229552 (1880-07-01), Phelps
patent: 353868 (1886-12-01), Koerner
patent: 572201 (1896-12-01), Hausmann
patent: 826582 (1906-07-01), Laird
patent: 1051950 (1913-02-01), Francis
patent: 1206628 (1916-11-01), Webster
patent: 1973774 (1934-09-01), Pflugradt
patent: 2997127 (1961-08-01), Wojtowicz
patent: 3311190 (1967-03-01), Naumann
patent: 3912043 (1975-10-01), Brannan
patent: 4030565 (1977-06-01), Chaput
patent: 4483415 (1984-11-01), Disston
Disston Horace C.
Eichfeld Timothy J.
Machado Reinaldo P.
Youtie Robert K.
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