Carrier with foldable wheels
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United States of America Patent
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Sep 19, 2017
Issued Date -
N/A
app pub date -
May 11, 2015
filing date -
May 11, 2014
priority date (Note) -
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Abstract
Disclosed is a device for turning rotatable rods for folding or unfolding wheels of a carrier, the device comprising: a pair of rotatable rods, each of which comprises one or more helical lines; a cross bar comprising helical line coupling portions coupled to one or more helical lines, and one or more elastic members, which provide restoring forces to the cross bar.
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