公开(公告)号：US20240401514A1

公开(公告)日：2024-12-05

申请号：US18718643

申请日：2022-12-28

Applicant: TOPURA CO., LTD.

Inventor： Shinya Yamamoto ,  Hiroshi Suzuki ,  Mayumi Matsuno ,  Masanari Kobayashi ,  Takenori Okawa ,  Kei Endo ,  Daisuke Kitahara

IPC: F01N13/18

Abstract: A fastening member includes: a fastening main body section; and a coil spring assembled with the fastening main body section. The fastening main body section includes a threaded section configured to be coupled to a coupling target, a shaft section extending from one end of the threaded section, a head section provided on a side of the shaft section opposite to the threaded section side, the head section having a maximum diameter greater than an inner diameter of the coil spring, a stepped section provided between the shaft section and the head section, and a locking section provided in the stepped section or the head section and configured to lock the coil spring. The coil spring is configured to be inserted into the shaft section and the stepped section, and be locked to the locking section.

公开(公告)号：US11795986B2

公开(公告)日：2023-10-24

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 ,  F16B5/00

CPC classification number: F16B5/0052

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：US11279990B2

公开(公告)日：2022-03-22

申请号：US15999785

申请日：2017-02-16

Applicant: NHK SPRING CO., LTD. ,  TOPURA CO., LTD.

Inventor： Noriyoshi Kaneda ,  Takeshi Suzuki ,  Kouhei Miyamoto ,  Naoki Horiuchi

IPC: C22C21/14 ,  C22C21/16 ,  C22C21/18 ,  C22C21/08 ,  C22C21/02 ,  C22C21/00 ,  C22F1/043 ,  C22F1/057 ,  F16B19/06 ,  F16B35/00 ,  F16B37/00

Abstract: An aluminum alloy contains 0.7% to 1.8% of silicon, 0.5% to 2.1% of copper, 0.4% to 1.8% of manganese, 0.6% to 1.6% of magnesium, and 0.1% to 0.7% of zinc in terms of mass ratio and the balance aluminum with inevitable impurities.

公开(公告)号：US11162525B2

公开(公告)日：2021-11-02

申请号：US16470972

申请日：2017-11-20

Applicant: TOPURA CO., LTD.

Inventor： Kuninori Matsumoto ,  Mayumi Matsuno

IPC: F16B39/26 ,  F16B5/02 ,  F16B25/00

Abstract: An external thread member capable of performing a fastening operation efficiently without increasing the number of parts by assembling a collar into the external thread member. The external thread member 1 includes a shaft portion 5 inserted into a mounting hole 105 of a mounting member 101 through a collar 7, and the mounting member 101 is fastened to a fastening member 102. The shaft portion 5 includes a threaded portion 51 and a neck portion 52. The collar 7 is mounted on the neck portion 52 so as to be rotatable relative to each other and is engaged with the threaded portion 51 whereby retention is achieved. A counterbore hole 106 is formed in an opening close to the mounting hole 105 of an internal thread hole 104 with a tubular portion 71 inserted into the mounting hole 105 of the collar 7.

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：US12038035B2

公开(公告)日：2024-07-16

申请号：US17217056

申请日：2021-03-30

Applicant: TOPURA CO., LTD.

Inventor： Youichi Matsueda

IPC: F16B43/00 ,  F16B23/00 ,  F16B35/04

CPC classification number: F16B43/001 ,  F16B23/0084 ,  F16B35/041

Abstract: A threaded fastener includes a bolt and a washer. The washer has a washer main body and a seal member provided at an outer peripheral side of the washer main body. The washer is caulked and fixed to a shank portion of the bolt in a water stop state, and the seal member is in contact with a fastened member in a water stop state, with a bearing surface of the washer main body held in contact with the fastened member. The seal member is provided on its outer periphery with a protrusion portion that protrudes outward beyond a radially outer end of a contact portion of the seal member with the washer in a no-load state. A back surface of the protrusion portion on the opposite side of the fastened member is an inclined surface.

公开(公告)号：US11846311B2

公开(公告)日：2023-12-19

申请号：US17251595

申请日：2019-06-12

Applicant: TOPURA CO., LTD.

Inventor： Naoki Horiuchi ,  Keisuke Hibino

IPC: F16B33/02 ,  F16B35/04

CPC classification number: F16B33/02 ,  F16B35/047

Abstract: 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.

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.

公开(公告)号：US20190316230A1

公开(公告)日：2019-10-17

申请号：US15999785

申请日：2017-02-16

Applicant: NHK SPRING CO., LTD. ,  TOPURA CO., LTD.

Inventor： Noriyoshi KANEDA ,  Takeshi SUZUKI ,  Kouhei MIYAMOTO ,  Naoki HORIUCHI

IPC: C22C21/02 ,  C22F1/043 ,  C22C21/14 ,  C22C21/16 ,  C22C21/18 ,  C22C21/00 ,  C22F1/057

Abstract: An aluminum alloy contains 0.7% to 1.8% of silicon, 0.5% to 2.1% of copper, 0.4% to 1.8% of manganese, 0.6% to 1.6% of magnesium, and 0.1% to 0.7% of zinc in terms of mass ratio and the balance aluminum with inevitable impurities.

公开(公告)号：US10294977B2

公开(公告)日：2019-05-21

申请号：US15126698

申请日：2015-03-20

Applicant: NHK Spring Co., Ltd. ,  TOPURA CO., LTD.

Inventor： Toshio Kazama ,  Takeshi Suzuki ,  Shigeto Mori

IPC: F16B35/04 ,  F16B33/00 ,  F16B33/06 ,  C22C21/06 ,  C22C21/10 ,  B32B15/01

Abstract: A fastening member includes a first alloy portion and a second alloy portion. The first alloy portion is made of an aluminum alloy including 0.005 wt % to 5.0 wt % zinc and 0.6 wt % to 2.0 wt % magnesium and is provided to a part that comes into contact with at least one of a plurality of members serving as a fastening target. The second alloy portion is made of an aluminum alloy including more than 2.0 wt % and 5.0 wt % or less magnesium and more than 5.0 wt % and 10 wt % or less zinc and is joined to the first alloy portion.