DROP-OFF PREVENTION TOOL

Japanese Patent JP2016156482

A

PROBLEM TO BE SOLVED: To provide a drop-off prevention tool which can be threaded into a bolt with a small force and improves durability and reliability.SOLUTION: The drop-off prevention tool comprises: a first coil spring part formed from a coil element wire that is wound in a predetermined direction; a second coil spring part 2 which has one end to be connected with one end of the coil element wire forming the first coil spring part 1, is formed from a coil element wire that is wound in the same direction as the predetermined direction and has a diameter smaller than an inscribed circle of the first coil spring part; and a third coil spring part 3 which has one end to be connected with the other end at a side opposite to the one end of the coil element wire of the second coil spring part connected with the one end of the coil element wire of the first coil spring part, is formed from a coil element wire that is wound in the same direction as the predetermined direction, and has an inscribed circle that is larger than the diameter of the second coil spring part. A shape of the first coil spring part is substantially similar to that of the third coil spring part, the second coil spring part is formed from three or more coils, and half coils at both the ends of the second coil spring part are wound in such a manner that a curvature radius becomes larger gradually.SELECTED DRAWING: Figure 1

SASAKI HARUO
OWAYA MAKI
HIRATA SHINICHIRO

JP2015036484A

September 01, 2016

February 26, 2015

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TAISEI CORP
TOKYO KOKI CO LTD

F16B39/20; F16B37/12; F16B41/00

JP2004100952A	2004-04-02
JPS6298015A	1987-05-07
JPS1012319Y1

WO2011145212A1	2011-11-24
DE19831001A1	2000-02-17

Zentaro Hasebe
Yasuyuki Yamada
Nakamura Norihiro

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