Title:
打ち込み式ねじ釘
Document Type and Number:
Japanese Patent JP6816855
Kind Code:
B2
Abstract:
In an impact-driven threaded nail, a thread has a steep lead angle of about 45° in order to attach a material with the nail by hitting a nail head and causing the threaded nail to rotate. When external force is applied in a direction to pull back the attached material from an underlying material, the threaded nail is often slightly rotated in a loosening direction, thereby generating a gap between the underlying material and the attached material, particularly in the case of the attached material being a thin sheet such as plywood. The present invention addresses the problem of providing an impact-driven threaded nail equipped with a means for preventing the above-mentioned loosening. The solution means resides in that a tapered portion of the head of the impact-driven threaded nail on a back-surface side thereof is formed in a pyramidal shape having a regular polygonal cross-section with a diameter decreasing gradually toward the nail shank. By driving the impact-driven threaded nail until an upper surface of the threaded nail head becomes flush with a surface of the attached material, an effect of preventing the threaded nail from rotating is obtained with the aid of both restoration force due to elastic deformation of the attached material and pressing force acting on the regular polygonal surface of the threaded nail head when the attached material is going to be pulled back.
Inventors:
Takeo Hasegawa
Application Number:
JP2014267286A
Publication Date:
January 20, 2021
Filing Date:
December 24, 2014
Export Citation:
Assignee:
Fujitomi Co., Ltd.
International Classes:
F16B25/00; F16B15/00; F16B15/02; F16B35/04
Domestic Patent References:
| JP201143234A | ||||
| JP1037925A | ||||
| JP49653A | ||||
| JP2013116345A | ||||
| JP5497668U | ||||
| JP55104105U | ||||
| JP316504Y1 | ||||
| JP1514084Y1 | ||||
| JP365005Y1 | ||||
| JP5994607U |