Fastener
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United States of America Patent
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Nov 19, 2013
Grant Date -
Feb 21, 2013
app pub date -
Dec 1, 2011
filing date -
Aug 18, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A fastener includes a bolt, a ring engaged around the bolt, and a coil spring. The bolt includes a head, a threaded engaging portion, a shaft portion between the head and the threaded engaging portion, and a bottom flange extending radially and outwards from an end of the shaft portion connecting the threaded engaging portion. The shaft portion includes a main part connecting the head, a tail part connecting the bottom flange, and a guiding part connecting the main part and the tail part. A diameter of tail part is smaller than a diameter of the main part. A diameter of the guiding part increases from the tail part to the main part along an axial direction of the bolt. The coil spring coils the shaft portion and is sandwiched between the head of the bolt and the ring.
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