Fire escape – ladder – or scaffold – Means maintaining step lever on horizontally pivoted ladder
Patent
1977-02-14
1978-07-18
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining step lever on horizontally pivoted ladder
182 97, 182164, 182106, 182207, B63B 2920
Patent
active
041009959
ABSTRACT:
A telescopic set of steps comprises at least two frames, each of which consists of two parallel members forming stringboards, one end of one of the frames being pivoted to a fixed support for pivotal movement about a horizontal axis, and the other frame being slidable along the pivoted frame, means for varying the slope of the set of steps, a plurality of steps pivoted about respective axes parallel to the said horizontal axis and comprising a first group of steps mounted directly on the sliding frame, and a second group of steps, each of which has an axle mounted on a respective pair of supports which are slidable along a pair of slideways formed on respective stringboards of the pivoted frame, slideway extensions extending onto the fixed support to a distance at least equal to the length of the sliding frame, means for maintaining a constant spacing between the pivot axes of the steps, means for maintaining the steps parallel to one another, and means for setting the inclination of at least one step.
REFERENCES:
patent: 1590317 (1926-06-01), Richards
patent: 2812528 (1957-11-01), Odell
patent: 3139949 (1964-07-01), Graves
patent: 3970169 (1976-07-01), Gonzalez
patent: 4013140 (1977-03-01), Pradon
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