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Patent Searching and Data

Document Type and Number:
Japanese Patent JPH074417
Kind Code:

PURPOSE: To prevent a bolt from being loosened by providing a tapered hole and a slit for the axial through hole of a bolt main body, forming a notch and a taper at the head section of a deforming bolt in the through hole, and thereby threadedly engaging a nut with the shaft end section of the deforming bolt within the recessed section of the head section of the bolt main body.

CONSTITUTION: When a nut 3 is rotated after a bolt main body 1 has been installed in a bolt hole 14, the tapered head section 9 of a deforming bolt 2 disposed within the tapered hole 7 of the bolt main body 1 is moved to the head section 4 of the bolt main body 1. This constitution thereby allows the inner wall surface of the tapered hole 7 to be expanded outward by the head section 9. In this case, the head section 9 allows an overhang section 13 due to a notch 12 to be engaged with the slit of the bolt main body 1, so that a deforming bolt 2 is prevented from being rotated together with the nut 3. The outward expansion of the shaft end section of the bolt main body 1 permits the screw thread of the shaft end section to bite in the screw thread of the bolt hole 14, and prevents the bolt main body 1 from being rotated thereafter, so that the bolt main body is thereby prevented from being loosened.

Application Number:
Publication Date:
January 10, 1995
Filing Date:
June 14, 1993
Export Citation:
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International Classes:
F16B39/02; (IPC1-7): F16B39/02
Attorney, Agent or Firm:
Sumiko Shimosaka