To provide a loosening-prevention screwing structure that can be re-fastened after fastened once, can exert a function for surely preventing loosening at a degree not lower than a prescribed value, and can secure a holding property of a fastening axial force by the whole screwing structure.
The loosening-prevention fastening structure is composed of a nut structure 1 having a fastening part 12 which has an inner screw extension continuously formed from an inner screw of a nut 11, and a plate-shaped washer structure 2 having a washer hole 21 which allows the penetration of the fastening part 12. The washer hole 21 has, from a one-face side of the washer plate toward a position close to the other face, a diameter-contracted structure which reaches the smallest diameter part having a smaller hole shape than the smallest part of a contour by being contracted in diameter from a large-diameter part which is formed at the one-face side of the washer plate, and has a larger hole shape than the contour at the release of the fastening part 12. By an effect that the smallest diameter part circumferentially and adhesively fastens the fastening part 12 by the fastening of the nut structure, pressure-adhesion fastening is performed.
IMODA YOSHIHIKO
| JPH01105011A | 1989-04-21 | |||
| JPH01150011A | 1989-06-13 | |||
| JPH09210039A | 1997-08-12 | |||
| JPH08205354A | 1996-08-09 | |||
| JPH05332340A | 1993-12-14 | |||
| JP2002372024A | 2002-12-26 | |||
| JP2007327535A | 2007-12-20 | |||
| JP2006329308A | 2006-12-07 | |||
| JP2004332800A | 2004-11-25 | |||
| JP2003056541A | 2003-02-26 | |||
| JP2002349530A | 2002-12-04 | |||
| JP3156798U | 2010-01-21 |
Nozomi Tsujimoto
Morita Takuo
Next Patent: SPINDLE MOTOR