Ladder constructions
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 27, 1980
Grant Date -
N/A
app pub date -
Oct 13, 1978
filing date -
Oct 13, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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