Ladder constructions

Details Ladder constructions Ladder constructions

1978-10-13

1980-05-27

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Rung or rung-to-stile connection

182194, 182126, E06C 708, E06C 750

Patent

active

042045878

ABSTRACT:
Ladders made of metal comprising first sections of metal channel that intersect second sections of metal channel have the first and second sections joined together without use of rivets or weldings by providing the first sections with pairs of U-shaped cavities, the second sections with tip flanges, fitting the tip flanges, in various ways, into the U-shaped cavities and press forming portions of the first sections against the tip flanges to lock the first and second sections together. Typically, the first sections would be side rails and the second sections, steps, rungs or cross braces.

REFERENCES:
patent: 2090331 (1937-08-01), Kutscheid
patent: 3559763 (1971-02-01), Stern

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