Fastener and Fastening Structure
AssigneeArt Screw Co., Ltd.
InventorKou Matsubayashi
Life of this patent
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Abstract
To provide a fastener having a high anti-loosening effect. A fastener has a thread structure including an upper portion of the crest and a bottom portion at the groove. The upper portion has a load flank surface inclined from the standard load flank surface toward the fastener seat while the bottom has an undercut on at least one of the groove side lower than the extension of the corresponding flank surface.
Claims17
A fastening member having a thread structure including an upper portion provided on a side of a thread crest, and a lower portion provided on a side of a thread root, wherein
- said thread crest and a pressure flank surface formed in said upper portion is provided on a side of a seat surface with respect to a pressure flank surface of a basic profile, and
- at least one side surface of said lower portion is provided inwardly of an extension line of a corresponding flank surface of said upper portion, and formed to be continuous from a lower end of said corresponding flank surface.
3-12. (canceled)
A fastening member having a thread structure including an upper portion provided on a side of a thread crest, and a lower portion provided on a side of a thread root, wherein
- a crest and a pressure flank surface of said thread structure are shifted to a side of a seat surface with respect to a crest and a pressure flank surface of a basic profile using a pair of roots of said basic profile as base points,
- said pressure flank surface of said thread structure is parallel to said pressure flank surface of said basic profile, and
- at least a pressure side surface of said lower portion is provided inwardly of an extension line of a corresponding flank surface of said upper portion, and is formed to be continuous from a lower end of said corresponding flank surface.
Dependencies are inferred from the claim text.