Title:
木ねじ構造
Document Type and Number:
Japanese Patent JP7016852
Kind Code:
B2
Abstract:
A wood screw that includes a head (1) and a shank (2) is revealed. The shank (2) is formed by a main shank portion (21) and a tapered portion (22) whose diameter is smaller than that of the main shank portion, the main and tapered portions provided with a first (23) and second (24) locking thread respectively. A plurality of drilling units (25), whose outside diameter (D3) of the drilling unit (25) is smaller than that (D4) of the second locking thread (24), is disposed on the tapered portion (22). The drilling units first destroy workpiece material corresponding to the main shank portion so that the workpiece material becomes loose and the resistance of the first locking thread of the main shank portion is reduced. Thereby the wood screw is screwed into the workpiece more smoothly. Moreover, an internal thread segment whose thread depth matches that of the locking thread of the main shank portion is formed so that the wood screw and the workpiece are fastened more firmly.
Inventors:
Xu Kuniyasu
Satoru
Satoru
Application Number:
JP2019227334A
Publication Date:
February 07, 2022
Filing Date:
December 17, 2019
Export Citation:
Assignee:
Xu Kuniyasu
Satoru
Satoru
International Classes:
F16B25/10; F16B35/00
Domestic Patent References:
| JP2007315513A | ||||
| JP56015814U | ||||
| JP2010190269A | ||||
| JP9217722A |
Foreign References:
| US20180266467 |
Attorney, Agent or Firm:
Sakuo Yamaguchi
Nobuyuki Oshima
Shinjiro Yamaguchi
Nobuyuki Oshima
Shinjiro Yamaguchi
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