Fire escape – ladder – or scaffold – Ladder with pivoted prop – Lateral prop
Patent
1989-12-07
1990-08-21
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder with pivoted prop
Lateral prop
2483541, E06C 536, E06C 122
Patent
active
049498096
ABSTRACT:
A locking mechanism for fixing the first and second telescopingly disposed tubular poles longitudinally relative to one another includes a longitudinally extending channel of rectangular cross-section projecting radially from the outermost tube and running the length thereof and an elongated rack having a plurality of spaced, parallel teeth projecting radially outward from the inner tubular member and fitted into the channel of the outer tubular member. Affixed to one end of the outer tubular member is a sleeve on which is rotatably mounted a locking ring having a notch extending along the width dimension thereof and a plurality of parallel, arcuate spaced-apart teeth circumferentially adjacent the notch. When the rack on the inner tubular member is aligned with the notch in the ring, the outer and inner tubular poles can slide relative to one another. By then rotating the locking ring, its teeth are made to mesh with the teeth on the rack of the inner tubular member, preventing further longitudinal displacement between the telescoping pole segments.
REFERENCES:
patent: 4872529 (1989-10-01), Viets
patent: 4899849 (1990-02-01), Levi et al.
Levi Avraham Y.
Quarberg Craig D.
A. C. Innovations, Inc.
Machado Reinaldo P.
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