Patent ID: 8944179
Filing Date: 2015-02-03
Classification: B25B,B25F

Abstract:
1. A power tool comprising a driving motor and a power transmitting mechanism to transmit power of the driving motor to a tool bit to perform a predetermined operation on a workpiece via the tool bit, wherein: the power transmitting mechanism includes: a driving-side member that is rotationally driven by the driving motor, a driven-side member that holds the tool bit, an engagement part that engages the driving-side member and the driven-side member when the driven-side member is pushed in toward the driving-side member together with the tool bit by user's pressing force, a detecting mechanism that detects an operating condition of the driven-side member with respect to the driving-side member, and a controller that can control the driving motor, according to the operating condition of the driven-side member detected by the detecting mechanism, in a first control mode in which the driving motor is controlled to rotate at a first rotation speed greater than zero before the driving-side and driven-side members are engaged with each other at the engagement part, and in a second control mode in which the driving motor is controlled to rotate at a second rotation speed higher than the first rotation speed after the driving-side and driven-side members are engaged with each other at the engagement part.