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US 11,795,986 B2Granted
External screw member
AssigneeTopura Co., Ltd.
InventorsMinoru Sugiyama, Shigeto Mori, Mayumi Matsuno, Naoki Horiuchi
Life of this patent
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AssigneeTopura Co., Ltd.
InventorsMinoru Sugiyama, Shigeto Mori, Mayumi Matsuno, Naoki Horiuchi
Estimating the term…
An external screw member includes a parallel screw portion and a tapered screw portion provided on a side further toward a tip end than the parallel screw portion, and a plurality of sets of step portion and a transition screw thread portion are provided on at least one of the parallel screw portion and the tapered screw portion, the step portion having a reduced thread height in a radial direction and the transition screw thread portion gradually increasing in diameter from the step portion in an anti-driving rotation direction so as to reach a thread height of a normal screw thread portion. A top portion of the transition screw thread portion is positioned at an offset toward a pressure side relative to a position of a regular screw pitch in a minimum diameter portion of the step portion, and transitions to the regular screw pitch in the anti-driving rotation direction.
An external screw member comprising a parallel screw portion and a tapered screw portion provided on a side further toward a tip end than the parallel screw portion, wherein
Dependencies are inferred from the claim text.