Helical spring, connector, electrode and electrometer
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United States of America Patent
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Sep 29, 2015
Grant Date -
Apr 17, 2014
app pub date -
Mar 4, 2013
filing date -
Oct 12, 2012
priority date (Note) -
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Abstract
A helical spring includes cylindrical portions and a widened portion disposed between the cylindrical portions. The cylindrical portions are disposed at both ends of the helical spring in the axis direction and have a constant outside diameter. In the widened portion, from the both ends of the helical spring toward a center of the helical spring in the axis direction, a diameter of the helical spring increases as a pitch of the helical spring increases. The helical spring can be used as part of a connector, an electrode or an electrometer.
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