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US 11,846,311 B2Granted
External thread member
AssigneeTopura Co., Ltd.
InventorsNaoki Horiuchi, Keisuke Hibino
Life of this patent
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AssigneeTopura Co., Ltd.
InventorsNaoki Horiuchi, Keisuke Hibino
Estimating the term…
An external thread member capable of preventing oblique entry or insertion by a short screw tip shape is provided including, in its shank portion (20), a normal thread area (22), a guide thread area (24) provided at a tip side of the shank portion with respect to the normal thread area (22) and in which a guide screw thread (23) is formed, and a rising area (26) in which a transition screw thread (25) gradually rising from the guide screw thread (23) to the complete screw thread (21) is formed. A tapered guide portion (30) is provided at a tip end side of the normal thread area (22) and includes at least the guide thread area (24). The guide screw thread (23) is formed on an outer periphery of the tapered guide portion (30) which has a maximum diameter equal to or smaller than an inner diameter of an internal thread.
An external thread member including, in its shank portion, a normal thread area in which a complete screw thread to be fastened to an internal thread member is formed, a guide thread area which is provided on a shank portion tip end side with respect to the normal thread area and in which a guide screw thread having a diameter smaller than that of the complete screw thread and having a same pitch is formed, and a rising area in which a transition screw thread gradually rising from the guide screw thread to the complete screw thread is formed,
Dependencies are inferred from the claim text.