| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost screw-loosening detection apparatus which can be inserted laterally and engaged with screw fastening means without removing an existing member to be fixed or the screw fastening means, without additional machining, configured to be easily installed and stably held, while accurately detecting a screw loosening state for a long time.SOLUTION: A turning member 2 includes an engaging hole 2a communicating with a first notch 2d to be engaged with a bolt or a nut, and includes a magnet embedded near a periphery. A body member 1 includes a second notch 1j, holds the turning member 2 turnably, and includes a lead switch arranged close to a turning area where the magnet turns. The lead switch performs switching operation when the magnet moves closer or apart. A screw-loosening detection apparatus having the above configuration is engaged with a bolt and fixed firmly to a structure by means of magnetic force attraction means 5. |
