Metal ladder and method of fabricating the same

Details Metal ladder and method of fabricating the same Metal ladder and method of fabricating the same

1980-01-17

1981-04-14

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

182219, 182228, 29512, E06C 708

Patent

active

042614368

ABSTRACT:
A metal ladder is fabricated from a pair of spaced rails in which the rails have web portions which are provided at spaced intervals with inwardly directed embossments. Each of these embossments has an opening into which one end of a tubular rung is inserted and swaged to the rail. The embossments act as ribs to carry the load toward the flanges constituting the stiffer portions of the rail thereby increasing the strength and effectively reducing the web flexure and angle changes between the rungs and the rails, due to sideward forces in ladder use. By reason of the built in stiffness web thickness may be reduced resulting in savings in materials. Additionally, intermediate these embossments, just described, the web portion of each rail is formed with one or more outwardly directed embossments.

REFERENCES:
patent: 805570 (1905-11-01), Maldaner
patent: 3193051 (1965-07-01), Dosker
patent: 3283402 (1966-11-01), Larson
patent: 3388454 (1968-06-01), Willis
patent: 3856113 (1974-12-01), Engvall
patent: 4063836 (1977-12-01), Militano
patent: 4205426 (1980-06-01), Stillman, Jr.

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