Ladder

Details Ladder Ladder

1979-09-14

1980-10-21

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

182228, 113116V, E06C 138

Patent

active

042288720

ABSTRACT:
To enable use to be made of relatively thin sheet metal to be employed in the manufacture of a ladder which is formed by punching adjacent openings from the sheet to leave edge strips which are subsequently folded to form stiles and cross pieces which are twisted to form tread bodies, embossed corrugations are incorporated into the twisted metal portions between the tread bodies and the stiles, and stiffening cheeks along the edges of the tread bodies are folded below the said bodies, thereby to impart rigidity to the ladder structure. Additionally or alternatively, holes and/or further corrugations may be provided, and the stiles may, if desired, be of oval cross-section each with connecting cheeks along their facing edges.

REFERENCES:
patent: 1196667 (1916-08-01), Dallmeyer
patent: 1688210 (1928-10-01), Smith
patent: 1714451 (1929-05-01), Sauvage
patent: 3299985 (1967-01-01), Harrison
patent: 3908260 (1975-09-01), Loomis

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