Ladder structure

Details Ladder structure Ladder structure

1974-11-08

1976-04-13

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

182228, 182 46, E06C 750

Patent

active

039498360

ABSTRACT:
Ladder structures are disclosed comprising a pair of side rails and a plurality of tubular extruded aluminum rung members extending therebetween. The opposite ends of each rung are interconnected with the corresponding side rail by means of an expandable fastener extending through an opening in the rails and into the rung end. The openings in the rails and rung are non-circular and the corresponding portions of the fastener are non-circular, whereby rotation of the fastener and rung relative to the side rail is precluded.

REFERENCES:
patent: 1191151 (1916-07-01), Brush
patent: 2006300 (1935-06-01), Kinninger
patent: 2989141 (1961-06-01), Howard
patent: 3186561 (1965-06-01), Strassle
patent: 3469493 (1969-09-01), Fisher
patent: 3520663 (1970-07-01), Schertel
patent: 3566992 (1971-03-01), Berger
patent: 3608256 (1971-09-01), Jefferys
Designing With Aluminum Extrusion, Reynolds Metals Co.

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