Patent ID: 8960688
Filing Date: 2015-02-24
Classification: B23D,B24B,B27B,Y10T

Abstract:
1. A power tool, comprising: a driving shaft defining a longitudinal axis and driving a working element; a fastening piece fastening the working element to the driving shaft and having a projecting shaft insertable into the driving shaft; a locking assembly locking the projecting shaft in the driving shaft, the locking assembly comprising a radial locking member having a locking position for locking the projecting shaft in the driving shaft and a loosening position for loosening the projecting shaft in the driving shaft; and an elastic component for pressing the fastening piece towards an end portion of the driving shaft at the locking position; wherein the locking assembly further comprises a movable member movable along the longitudinal axis of the driving shaft, operatively coupled to the radial locking member, and arranged around the driving shaft, an inner surface of the movable member having a first portion and a second portion, wherein a radial distance of the first portion relative to a shaft center of the driving shaft is unequal to that of the second portion relative to the shaft center of the driving shaft such that, when the first portion is directly or indirectly mated with the locking member, the locking member is at the locking position and when the second portion is directly or indirectly mated with the locking member the locking member is at the loosening position.