Method and apparatus for treating ladder rungs for forming assembly with ladder rails
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Apr 3, 1989
filing date -
Apr 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for treating preselected areas of metallic ladder rungs wherein such metallic spaced rungs are moved in a path substantially normal to the longitudinal axes of the rungs with preselected areas of the spaced rungs passing through a controlled longitudinally extending heating zone to heat such preselected areas to a desired annealing temperature.
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