Patent ID: 9737984
Date: 2017-08-22
CPC Classifications: B23B,B25B,B25F

Claim:
1. A power tool, which rotationally drives a tool accessory around a prescribed axial direction, comprising: a tool body, a rotary shaft that holds the tool accessory in a front end region of the tool body such that a tip of the tool accessory protrudes from the tool body, a brushless motor having an output shaft, an operating member that is manually operated by a user to drive the brushless motor, and a rotation transmitting mechanism that transmits rotation of the output shaft to the rotary shaft, wherein: the rotary shaft is movable between a first position on a front end region side of the tool body and a second position apart from the front end region side in the axial direction, a detecting mechanism that detects the position of the rotary shaft in the axial direction, and a controller that controls the rotation speed of the brushless motor according to the position of the rotary shaft detected by the detecting mechanism, wherein: the rotation transmitting mechanism interrupts transmission of rotation of the output shaft to the rotary shaft when the rotary shaft is located at the first position, and transmits rotation of the output shaft to the rotary shaft when the rotary shaft is located at the second position, the detecting mechanism is arranged such that the detecting mechanism and the front end region hold the rotation transmitting mechanism therebetween in the axial direction, the controller has a first mode of controlling the rotation speed of the brushless motor to a first rotation speed when the rotary shaft is located at the first position, and a second mode of controlling the rotation speed to a second rotation speed exceeding the first rotation speed when the rotary shaft is located at the second position, and after the operating member is operated, the controller switches between the first mode and the second mode based on the position of the rotary shaft in the axial direction and controls the rotation speed of the brushless motor.