Bolt
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United States of America Patent
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-
Aug 1, 2017
Issued Date -
N/A
app pub date -
Feb 18, 2015
filing date -
Sep 30, 2014
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A bolt including a head portion, a shaft portion, and an external thread formed in the shaft portion, the bolt having: a plurality of thread collapsed rib portions each of which is composed of projecting portions that are arranged in a longitudinal direction of the shaft portion, each projecting portion being formed by collapsing a top portion of a screw thread of the external thread and by raising both sides of the collapsed top portion of the screw thread, wherein one projecting portion of the thread collapsed rib portion has a shape different from that of another projecting portion that is adjacent in a circumference direction of the screw thread of the adjacent thread collapsed rib portion in the shaft portion, such that an interference position with a counterpart internal thread varies in accordance with screw-engagement with the counterpart internal thread.
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