| 摘要 |
<p>It is an object of the invention to provide a technique that can alleviate noise when the clutch comes into engagement. Representative tightening tool (101) according to the invention comprises a motor (111), a driven shaft (117) driven by the motor (111), a tool bit (119) driven by the driven shaft (117) and a clutch mechanism (131). The clutch mechanism (131) includes a driving-side clutch element (133), a driven-side clutch element (135) and an engagement speedup mechanism (161). The engagement speedup mechanism (161) causes the driven-side clutch element (135) to move at higher speed than the driven shaft (117) when the driven-side clutch element (135) moves toward the driving-side clutch element (133) together with the driven shaft (117) so as to engage with the driving-side clutch element (133).</p><p>According to the invention, because driven-side clutch element (135) can swiftly move toward the driving-side clutch element (133) by the engagement speedup mechanism, noise when the clutch comes into engagement can be alleviated.
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