| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a loosening prevention bolt having a simple configuration and capable of reliably preventing loosening and of being repeatedly used in a wide range of construction processes, and to provide a loosening prevention bolt capable of reliably preventing loosening even for use in a place with strong temperature differences and for use in a place with strong vibrations and of being repeatedly used in a wide range of construction processes. <P>SOLUTION: The loosening preventing bolt includes a bolt body, a sub bolt, and a diameter expanding member on which a friction member is mounted in need. In the bolt body, a shaft hole is formed at least one end of a shaft core part so as to become a space of a circular truncated cone shape in which the end part of the shaft hole is enlarged as coming closer to the distal end, one or more of slits are formed from the distal end in the distal end part of the shaft part where the space with the circular truncated cone shape is formed, the diameter expanding member is arranged in the space of the bolt body and has side faces with the circular truncated cone shape abutting on the inner wall of the space and enlarging the diameter of the space, the sub bolt is inserted into the shaft hole arranged in the bolt body and moves the diameter expanding member in a direction for enlarging the diameter of the space of the bolt body and provides diameter enlarging force to the space of the bolt body. <P>COPYRIGHT: (C)2012,JPO&INPIT |
