Arm structure
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United States of America Patent
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Jun 28, 2016
Grant Date -
Sep 4, 2014
app pub date -
Feb 26, 2014
filing date -
Mar 1, 2013
priority date (Note) -
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Abstract
When the compression spring is compressed due to the relative displacement of the stopper which occurs in response to the tilt angle of the arm structure, the compression spring is compressed by the small relative displacement of the stopper over its entire body in the longitudinal direction, so that a repulsive force is obtained which varies little over the entire range of the tilt angle, enabling support of the heavy object in a stable condition.
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