Importance

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Abstract

It is an object of the invention to provide a technique that can alleviate noise when the clutch comes into engagement. Representative tightening tool according to the invention comprises a motor, a driven shaft driven by the motor, a tool bit driven by the driven shaft and a clutch mechanism. The clutch mechanism includes a driving-side clutch element, a driven-side clutch element and an engagement speedup mechanism. The engagement speedup mechanism causes the driven-side clutch element to move at higher speed than the driven shaft when the driven-side clutch element moves toward the driving-side clutch element together with the driven shaft so as to engage with the driving-side clutch element. According to the invention, because driven-side clutch element can swiftly move toward the driving-side clutch element by the engagement speedup mechanism, noise when the clutch comes into engagement can be alleviated.

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First Claim