Title:
おねじ部材
Document Type and Number:
Japanese Patent JP7328906
Kind Code:
B2
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.
Inventors:
Minoru Sugiyama
Shigeto Mori
Mayumi Matsuno
Naoki Horiuchi
Shigeto Mori
Mayumi Matsuno
Naoki Horiuchi
Application Number:
JP2020011669A
Publication Date:
August 17, 2023
Filing Date:
January 28, 2020
Export Citation:
Assignee:
Topura Co., Ltd.
International Classes:
F16B25/00; F16B25/04
Domestic Patent References:
| JP201631088A | ||||
| JP2005337406A | ||||
| JP6054823U | ||||
| JP2004190713A | ||||
| JP201919935A | ||||
| JP2019190512A | ||||
| JP2005127487A |
Foreign References:
| WO2012160619A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation Shuwa Patent Office
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