Method of manufacturing box ladders
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Mar 10, 1992
filing date -
Mar 13, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of manufacturing box ladders having a pair of side rails and rungs wherein each of the side rails are assembled from a pair of section members having holes pre-formed prior to assembly of the side rail. The method provides reduced deformation in the manufacture of box ladders having cylindrical rungs and provides for the manufacture of box ladders having non-cylindrical shaped rungs.
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