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US 9,752,609 B2Granted
Threaded fastener
AssigneeTopura Co., Ltd.
InventorsShigeto Mori, Hiroshi Nakano, Yosuke Okamura, Seiya Hoshino
Life of this patent
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AssigneeTopura Co., Ltd.
InventorsShigeto Mori, Hiroshi Nakano, Yosuke Okamura, Seiya Hoshino
Estimating the term…
A threaded fastener is provided in which a head bearing surface can be in full intimate contact with a counterpart. The threaded fastener is provided with a head (10), and a screw shank (20) extending from the head (10). The screw shank (20) is provided with a parallel thread portion (22) having a complete screw thread formed therein, a neck portion (24) having no screw thread, a transition thread portion (26) having an incomplete screw thread formed to extend from the parallel thread portion (22) toward the neck portion (24) with its root diameter being the same as that of the complete screw thread and with its thread height gradually becoming lower to reach the neck portion, and an underneck rounded portion (28) formed in a corner angle portion between the neck portion (24) and a head bearing surface (11), wherein the neck portion (24) is work hardened with its diameter being narrowed from a root diameter of the parallel thread portion (22).
A threaded fastener which is provided with a head and a screw shank extending from said head, wherein said screw shank is provided with a parallel thread portion having a complete screw thread formed therein, a neck portion having no screw thread, a transition thread portion having an incomplete screw thread formed to extend from said parallel thread portion toward said neck portion with its root diameter being the same as that of said complete screw thread and with its thread height gradually becoming lower to reach said neck portion, and an underneck rounded portion formed in a corner angle portion between said neck portion and a head bearing surface,
A method for manufacturing a threaded fastener which is provided with a head and a screw shank extending from said head, wherein said screw shank is provided with a parallel thread portion having a complete screw thread formed therein, a neck portion having no screw thread, a transfer thread portion having an incomplete screw thread formed to extend from said parallel thread portion toward said neck portion with its root diameter being the same as that of said complete screw thread and with its thread height gradually becoming lower to reach said neck portion, and an underneck rounded portion formed in a corner angle portion between said neck portion and a head bearing surface,
Dependencies are inferred from the claim text.