公开(公告)号：US20220128082A1

公开(公告)日：2022-04-28

申请号：US17430625

申请日：2020-02-03

Applicant: TOPURA CO., LTD.

Inventor： Shigeto MORI ,  Mayumi MATSUNO ,  Naoki HORIUCHI

IPC: F16B33/02

Abstract: To provide a screw thread which achieves a further reduction in screwing torque while securing removability of a coating film or the like and which is capable of stabilizing conductivity. In a screw thread in which a recessed portion (7) is partially provided on a flank surface (131) of a screw thread ridge provided on a screw thread shaft main body (5), a screw thread ridge (13) in a section where the recessed portion (7) is formed is smaller than a regular screw thread ridge (3), and a ridge height (H12) in a distal end portion in a screwing direction is lower than a ridge height (H11) in a rear end portion in the screwing direction W.

公开(公告)号：US20160169263A1

公开(公告)日：2016-06-16

申请号：US14903553

申请日：2014-07-08

Applicant: TOPURA CO., LTD.

Inventor： Shigeto MORI ,  Hiroshi NAKANO ,  Yosuke OKAMURA ,  Seiya HOSHINO

IPC: F16B35/04 ,  B21H3/02

CPC classification number: F16B35/048 ,  B21H3/02 ,  F16B39/30

Abstract: 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).

Abstract translation: 提供了一种螺纹紧固件，其中头部支承表面可与对应物完全紧密接触。 螺纹紧固件设置有头部（10）和从头部（10）延伸的螺钉柄（20）。 螺杆（20）具有形成有完整螺纹的平行螺纹部分（22），不具有螺纹的颈部（24），具有不完整螺纹的过渡螺纹部分（26）形成为延伸 从平行螺纹部分（22）朝向颈部部分（24），其根直径与完整螺纹的根直径相同，并且其螺纹高度逐渐变低以到达颈部部分，以及底部圆形部分（28 ）形成在颈部（24）和头部支承表面（11）之间的角角部分中，其中颈部（24）的工作硬化，其直径从平行螺纹部分（22）的根部直径变窄， 。

公开(公告)号：US20210231157A1

公开(公告)日：2021-07-29

申请号：US17160151

申请日：2021-01-27

Applicant: TOPURA CO., LTD.

Inventor： Minoru SUGIYAMA ,  Shigeto MORI ,  Mayumi MATSUNO ,  Naoki HORIUCHI

IPC: F16B25/00

Abstract: An external screw member includes a parallel screw portion and a tapered screw portion provided on a side further toward a tip end than the parallel screw portion, and a plurality of sets of step portion and a transition screw thread portion are provided on at least one of the parallel screw portion and the tapered screw portion, the step portion having a reduced thread height in a radial direction and the transition screw thread portion gradually increasing in diameter from the step portion in an anti-driving rotation direction so as to reach a thread height of a normal screw thread portion. A top portion of the transition screw thread portion is positioned at an offset toward a pressure side relative to a position of a regular screw pitch in a minimum diameter portion of the step portion, and transitions to the regular screw pitch in the anti-driving rotation direction.

公开(公告)号：US20200370587A1

公开(公告)日：2020-11-26

申请号：US16879344

申请日：2020-05-20

Applicant: TOPURA CO., LTD.

Inventor： Takehiro OKUWAKI ,  Kenju SAWANISHI ,  Shigeto MORI ,  Mayumi MATSUNO ,  Yoshie SATO

IPC: F16B25/00 ,  F16B33/02 ,  F16B25/10 ,  F16B35/04

Abstract: An external screw member includes a head, a shank, a parallel threaded portion, a tapered threaded portion, a screw thread, a convex portion and a screw driving side end face of the convex portion. The convex portion protruding more radially outward than the crest of the screw thread is formed in at least one of the parallel threaded portion and the tapered threaded portion over the tapered threaded portion and the parallel threaded portion. The screw driving side end face of the convex portion is configured to form an inclined plane which gradually rises from a root position of the end face at the side of the crest of the screw thread toward a crest of the convex portion in a direction opposite to a screw driving direction of the screw thread to reach the crest of the convex portion.