Title:
締結工具
Document Type and Number:
Japanese Patent JP6764332
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a fastening tool hardly making a deep recession on the end surface of a stud bolt.SOLUTION: A fastening tool includes: a bit body 10 provided with a first female screw part 12 screwing with a stud bolt B and a communication hole 13 comprising an inner diameter larger than that of the first female part 12; a steel ball 30 arranged so as to loosely fit into the communication hole 13; a pressing axis 40 inserted into the communication hole 13, relatively rotating at a predetermined angle to the bit body 10 and relatively movable in an axis direction; and an inclusion member 20 provided with an end part 22a inserted into the communication hole 13 and partly projecting to the first female part. The inclusion member 20 is structured so that the end part 22a on the side partly projecting to the first female part 12 is set to a curved surface flat or composed of a curvature radius larger than that of the steel ball 30, and thereby a deep recession is hardly made on one end of the stud bolt B fastened to the work W.SELECTED DRAWING: Figure 1
Inventors:
Keiichi Azumi
Application Number:
JP2016244894A
Publication Date:
September 30, 2020
Filing Date:
December 16, 2016
Export Citation:
Assignee:
Nitto Seiko Co., Ltd.
International Classes:
B25B21/00; B23P19/06
Domestic Patent References:
| JP63283872A | ||||
| JP62088535U |