Fire escape – ladder – or scaffold – Ladder – With hook or grab
Patent
1990-05-21
1991-02-26
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
With hook or grab
182107, 182214, E04C 748
Patent
active
049954768
ABSTRACT:
A safety attachment for a ladder is disclosed as including an extruded channel fixed to the top of the ladder with a screw shaft having left and right hand threads disposed in the channel, pole engaging arms extend from guides mounted on the shaft threads for movement of the arm to engage and disengage relative to the pole. A pulley fixed to the shaft rotates the same by means of a rope having ends extending toward the bottom of the ladder whereby the pulley may be operated either at the top or the bottom of the ladder.
REFERENCES:
patent: 1522292 (1925-01-01), Enssle
patent: 1658191 (1928-02-01), Gravning
patent: 2232414 (1941-02-01), Swann
patent: 2778556 (1957-01-01), Johnson
patent: 3336999 (1967-08-01), McSwain
patent: 4090587 (1978-05-01), Pyle
patent: 4469195 (1984-09-01), Sartain
Machado Reinaldo P.
O'Brien Anthony A.
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