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Title:
NUT HAVING REMOVAL PREVENTING FUNCTION AND SPECIAL SELF-LOCKING DOUBLE NUT
Document Type and Number:
Japanese Patent JP2007040344
Kind Code:
A
Abstract:

To easily and surely fasten a nut with proper fastening torque, and to prevent the nut from being easily taken out by mischief or the like after fastening.

This nut comprises a nut body 7 having a screw hole 5 at a shaft center in a state of being axially penetrated, a rotating tool engagement portion 8 mounted at the axial upper portion of the nut body 7, and a connecting portion 9 for connecting the nut body 7 and the rotating tool engagement portion 8, and is integrally molded, a cavity 11 having a diameter larger than the diameter of the screw hole 5 is formed at the shaft center of the rotating tool engagement portion 8, and the connecting portion 9 is broken when the rotating tool engagement portion 8 is fastened by fastening torque exceeding prescribed torque by a rotating tool engaged with the rotating tool engagement portion 8, thus the rotating tool engagement portion 8 is separated from the nut body 7.


Inventors:
WAKABAYASHI KATSUHIKO
Application Number:
JP2005223238A
Publication Date:
February 15, 2007
Filing Date:
August 01, 2005
Export Citation:
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Assignee:
HARD LOCK INDUSTRY CO LTD
International Classes:
F16B41/00; F16B31/02; F16B37/00; F16B39/12
Domestic Patent References:
JP2003254312A2003-09-10
JPH11303839A1999-11-02
JP3000526B
Attorney, Agent or Firm:
Taro Murakami