Fire escape – ladder – or scaffold – Ladder – Extension
Patent
1985-12-09
1987-02-03
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Extension
182 66, E06C 706
Patent
active
046403876
ABSTRACT:
The invention relates to a locking device between two relatively movable telescopic sections of an elevator such as a scaffolding or load hoist. The individual telescopic sections are locked together by a locking dog. The locking system can be arranged to snap in automatically, and to be released by cable actuation, or vice versa. The locking dog is actuated by a draw cable which controls a locking/release cable. The cable stretch of the draw cable is compensated by a tackle block reversal thereof, that is to say a substantially greater shortening takes place (with reduced force application) in the draw cable compared with the locking/release cable. Thus, a mechanical advantage is obtained not only within the draw cable itself, but also between the draw cable and the locking/release cable.
REFERENCES:
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patent: 2853221 (1958-09-01), Troche
patent: 4364451 (1982-12-01), Wright
Evans, Sr. George A.
Firma Albert Bocker GmbH & Co. Kg.
Machado Reinaldo P.
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