公开(公告)号：US10954985B2

公开(公告)日：2021-03-23

申请号：US16879344

申请日：2020-05-20

Applicant: TOPURA CO., LTD.

Inventor： Takehiro Okuwaki ,  Takeki Sawanishi ,  Shigeto Mori ,  Mayumi Matsuno ,  Yoshie Sato

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

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：US11953045B2

公开(公告)日：2024-04-09

申请号：US17430625

申请日：2020-02-03

Applicant: TOPURA CO., LTD.

Inventor： Shigeto Mori ,  Mayumi Matsuno ,  Naoki Horiuchi

IPC: F16B33/02

CPC classification number: 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：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：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.