| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive method of preventing looseness due to vibration between a bolt and a nut. SOLUTION: Additive (bond or rosin) is mixed in a wood piece so that the wood piece is evenly fitted to a screw portion during fastening a screw. The restoring property of the wood piece is utilized to make the screw hardly loosened. COPYRIGHT: (C)2007,JPO&INPIT
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