Spiral spring
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United States of America Patent
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Jul 26, 2016
Grant Date -
Oct 15, 2015
app pub date -
Nov 20, 2013
filing date -
Dec 13, 2012
priority date (Note) -
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Abstract
At least a first movable coil part of a plurality of movable coil parts that is in the innermost place in the radial direction does not come into contact with both the fixed coil part, which is radially adjacent inwardly, and a second movable coil part, which is radially adjacent outwardly, at the same place in the circumferential direction while coming into contact with only one of the fixed coil part and the second movable coil part in a plurality of places that are circumferentially displaced, when the spiral spring is in an elasticity retaining state reached from a free length state by elastic deformation in the diameter-reducing direction.
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