Threaded member, fastening member, and dart

  • US 10,663,270 B2
  • Filed: 02/09/2017
  • Issued: 05/26/2020
  • Est. Priority Date: 03/02/2016
  • Status: Active Grant
First Claim
Patent Images

1. A threaded member formed from a first end side to a second end side along the center line and being configured to be screwed with a member having a basic ridge profile in which a basic flank on each side of a ridge has a same flank angle, the threaded member comprising:

  • a discontinuous thread ridge formed along a helical direction around the center line of the threaded member, having a first flank on one side of the discontinuous thread ridge and a second flank on an opposite side of the discontinuous thread ridge, including a plurality of dividing portions and discontinuous portions, the plurality of dividing portions being formed in a middle of the helical direction of the discontinuous thread ridge and dividing the discontinuous thread ridge, the discontinuous portions are interposed parts in the dividing portions, wherein at least one of the discontinuous portions is a locking portion wherein the locking portion has a first flank of the pair of flanks that has a first flank angle smaller than the flank angle of the basic flank and at least part of the first flank in the helical direction is offset to the first end side from a corresponding angle of the basic flank as viewed in a superimposed view of a cross-section of the thread ridge and a cross section of the basic ridge profile, each cross-section being taken along a plane including a center axis of the thread profile, a second flank of the pair of flanks is offset to the first end side of the basic flank corresponding to the basic ridge profile so as to form a gap entirely separating with respect to the basic flank of the member having the basic ridge profile as viewed in the superimposed view, and wherein the first flank is a leading flank or a trailing flank, the second flank is a trailing flank when the first flank is a leading flank and the second flank is a leading flank when the first flank is a trailing flank, wherein the leading flank refers to a flank facing a moving direction of the threaded member when being screwed in, and the trailing flank refers to a flank on a side opposite to the leading flank.

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