脱落防止ボルト及び脱落防止部材

Japanese Patent JP6713875

B2

PROBLEM TO BE SOLVED: To provide a fall prevention bolt in which attachment/detachment of a nut member to/from a bolt is easy.SOLUTION: A bolt 10 includes a bolt body 1 and a cylindrical falling prevention member 2. The bolt body 1 includes a heat part 11h, a male screw part 11m and a fitting shaft part 11f. The fitting shaft part 11f is formed in the intermediate part of the male screw part 11m, and the fall prevention member 2 is fitted in the fitting shaft part 11f. The fall prevention member 2 has a circular outer periphery 2c and a projection 2b. In the outer periphery 2c, the diameter is made smaller than a thread diameter of a female screw part 3f of a nut member 3n which can be screwed to the male screw part 11m. The projection 2b bulges in a truncated cone manner from the outer periphery 2c of the fall prevention member 2, and a tip surface can press an inner wall of the female screw part 3f of the nut member 3n. In a state where the nut member 3n is rotated with a predetermined torque or greater, the nut member 3n can be screwed further. In a state where the nut member 3n has passed the projection 2b, the projection 2b returns elastically and falling of the nut member 3n can be prevented.SELECTED DRAWING: Figure 2

Oikawa Munetoshi
Soichiro Shinozawa
Yatsushiro Yuta
Hattori So
Nobuhiro Hayashi
Fujikawa Yoshimi

JP2016160177A

June 24, 2020

August 17, 2016

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Fuji Equipment Co., Ltd.
Shuto Expressway Co., Ltd.
Nabeya Bitec Co., Ltd.

F16B41/00

JP2002070916A
JP7019617A
JP5018410A
JP2007010132A
JP2000027839A
JP60182513U
JP60018323U
JP2012077782A

Takashi Onodera
Masao Sekiguchi

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