Fire escape – ladder – or scaffold – Convertible – Ladder
Patent
1989-09-05
1990-05-22
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Convertible
Ladder
182166, 182209, E06C 118, E06C 112
Patent
active
049269640
ABSTRACT:
This invention relates to a convertible step/extension ladder which allows to use one or more of extension sections with a basic A-shaped ladder frame. The extension sections are slidably mounted on legs of the frame through the use of housing/sliding rail arrangement on the legs of the frame and on the extension sections. When converted to an extension ladder, the basic frame portions are folded and locked in that position, while one extension section is moved along the frame portion to rest on the ground. If more than one extension sections are used, the second extension section is mounted on the opposite frame portion and extended upwardly, so that the basic frame portions form a middle part of the ladder.
REFERENCES:
patent: 408281 (1889-08-01), Wright
patent: 489059 (1893-01-01), Wieland
patent: 535082 (1895-03-01), Snell
patent: 763209 (1904-06-01), Schwalbe
patent: 860065 (1907-07-01), Scott
patent: 943511 (1909-12-01), Burgstaller
patent: 989570 (1911-04-01), Cooper
patent: 1441529 (1923-01-01), Saccone
patent: 3768592 (1973-10-01), Higgins
patent: 4155422 (1979-05-01), Larson
Keaty Thomas S.
Machado Reinaldo P.
LandOfFree
Step/extension ladder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Step/extension ladder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Step/extension ladder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2127314