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US 9,926,962 B2Granted
Self-tapping screw and method of manufacturing the same
AssigneeCrown Screw Corporation
InventorsNobuhiro Ogawa, Naoki Yokoyama
Life of this patent
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Abstract
A self-tapping screw includes a head and a shank extending from the head. The shank includes a cylindrical shank immediately below the head and a truncated conical shank following an end of the cylindrical shank. The cylindrical shank is provided with a plurality of first external threads, the truncated conical shank is provided with a plurality of second external threads following the first external threads, and a peak of each of the second external threads is provided with a biting surface having a concave-convex form.
Claims2
A self-tapping screw comprising:
- a head;
- and
- a shank extending from the head,
- the shank including a cylindrical shank immediately below the head and a truncated conical shank following an end of the cylindrical shank,
- the cylindrical shank being provided with a plurality of first external threads, and a plurality of no-thread parts,
- the truncated conical shank being provided with a plurality of second external threads, and with a plurality of no-thread parts following the first external threads,
- a peak of each of the second external threads being provided with a biting surface having a concave-convex form, wherein
- the biting surface bites into an inner peripheral surface of a pilot hole.
5 more elements
Dependencies are inferred from the claim text.