Fiber/resin composite ladder and accompanying accessories

Details Fiber/resin composite ladder and accompanying accessories Fiber/resin composite ladder and accompanying accessories

1997-12-12

1999-09-21

Chin-Shue, Alvin

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

16329, E05D 1100, E06C 750

Patent

active

059541571

ABSTRACT:
A combination step and extension ladder manufactured of prestressed filament wound composite material such as fiberglass is disclosed. The inner and outer side rails are molded, filament wound composite material (fiberglass) wherein the fibers are continuous and angularly oriented with respect to the longitudinal axis of the respective side rails. Hinges are provided on each of the inner side rails of the ladder and hinge actuators are located in the front edges of the outer side rails so that the ladder may be folded, unfolded or locked in either a closed, step ladder or straight extension ladder configuration, by depressing the hinge actuators, irrespective of the longitudinal position of the inner rail sections with respect to the outer rail sections. The inner side rails are telescopically mounted within channeled portions of the outer rails and interfaced with an "interlocking tongue and groove joint" such that the inner side rails can be extended to increase the height of the ladder in either configuration without compromising the torsion characteristics of the outer rail under a weighted load. Both the inner and outer side rails have composite rungs, integrally molded into the sides to produce a homogeneous casting. Ladder accessories are provided that facilitate stability and convenient use during operation thereof.

REFERENCES:
patent: 3517965 (1970-06-01), Cowles
patent: 4087885 (1978-05-01), Gillentine
patent: 4447033 (1984-05-01), Jaumann
patent: 4474264 (1984-10-01), Krause
patent: 4697305 (1987-10-01), Boothe

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