Fire escape – ladder – or scaffold – Having transpositioning base and erecting means
Patent
1980-12-29
1982-11-02
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Having transpositioning base and erecting means
182148, 187 18, E04G 122
Patent
active
043568874
ABSTRACT:
A rotatable platform assembly having upper and lower frames coupled together for rotation of the upper frame relative to the lower frame and about a first and fixed vertical axis. A large diameter ring, having its center at the first vertical axis, is mounted on the lower frame and has a cylindrical vertical outer surface and an annular horizontal track surface. The upper frame has a plurality of rollers in rolling engagement with the track and a chain sprocket mounted thereon and rotatable about a second vertical axis. A standard roller chain is trained around the ring and chain sprocket and the ring is provided with fixed chain-engaging pins and adjustable pad members engageable with the chain to take up chain slack between pins. A manually-operable, lockable and impact-releasable drive means is provided in the upper frame for rotation of the chain sprocket, so that the upper frame rotates about the first vertical axis with the rotating chain sprocket orbiting around such axis.
REFERENCES:
patent: 596676 (1898-01-01), Ford
patent: 803717 (1905-11-01), Scharz
patent: 1091419 (1914-03-01), Yandell
patent: 1092096 (1914-03-01), Donigan
patent: 1638611 (1927-08-01), Baldwin
patent: 2647022 (1953-07-01), Smid
patent: 2888299 (1959-05-01), Balogh
patent: 3095945 (1963-07-01), Mitchell
patent: 3509965 (1970-05-01), Mitchell
patent: 3709322 (1973-01-01), Mitchell
Fisher Robert E.
Weiner Gerhard J.
Machado Reinaldo P.
Up-Right, Inc.
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