MULTI-PURPOSE LADDER WITH THREE-PIPE RUNGS
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United States of America Patent
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Issued Date -
Jul 16, 2015
app pub date -
May 15, 2014
filing date -
Jan 16, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A multi-purpose ladder is characterized by that each of the inner rungs is a three-pipe rung composed of an upper tubular rung member, a lower tubular rung member, and an intermediate tubular rung member, wherein the intermediate tubular rung member is a square pipe with two ends thereof joined to the respective pair of inner rails; the upper tubular rung member and the lower tubular rung member each has a triangle-like cross-section and a length equivalent to the span between the respective pair of inner rails with a side along the vertex of the triangle-like cross-section joined to upper and lower sides of the intermediate tubular rung member respectively and a side along the base of the triangle-like cross-section constituting an inner upper pedal side and an inner lower pedal side which oppositely incline an angle corresponding to the outer upper pedal side and the outer lower pedal side, respectively.
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