Patent ID: 8708060

Claim:
A power screwdriver comprising: a rotary drive device; a spindle configured to be capable of mounting a driver bit; a clutch mechanism configured to transmit rotation of the rotary drive device to the spindle and comprising a drive side clutch member coupled to the rotary drive device and a driven side clutch member coupled to the spindle; wherein the drive side clutch member and the driven side clutch member have drive side clutch teeth and driven side clutch teeth, respectively, and; wherein the drive side clutch teeth and the driven side clutch teeth engage with each other and disengaged from each other according to the position of the driven side clutch member in an axial direction relative to the drive side clutch member; and a synchronization mechanism comprising a drive side contact member and a driven side contact member; wherein the drive side contact member and the driven side contact member are provided on the drive side clutch member and the driven side clutch member at positions radially inwardly of the drive side clutch teeth and the driven side clutch teeth, respectively; wherein prior to engagement of the driven side clutch teeth with the drive side clutch teeth in the midway of the axial movement of the driven side clutch member in a retreating direction, the drive side contact member and the driven side contact member frictionally slidably contact each other to transmit rotation of the drive side clutch member to the driven side clutch member.