Screw thread structure for preventing being pulled out and tool for manufacturing same
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United States of America Patent
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Dec 22, 2020
Grant Date -
Jan 4, 2018
app pub date -
Jan 5, 2016
filing date -
Apr 7, 2015
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides a looseness-prevention screw thread structure including a screw thread having a predetermined pitch, a no-load flank which is an inclined surface in a direction in which the screw thread is advanced, and a load flank which is an inclined surface in a direction in which the screw thread is retracted, the no-load flank and the load flank being formed at both sides of the screw thread, in which the no-load flank of the screw thread includes: a first tangential portion which abuts against an arc portion formed at a thread crest of an opposing fastening object; and a second tangential portion which has a preset angle with respect to the first tangential portion and abuts against the arc portion.
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