Patent ID: 8820431

Claim:
A power tool, which comprises: a housing; a chuck disposed in front of the housing, the chuck including: a shaft that defines a longitudinal axis and that includes a cavity along the longitudinal axis for receiving a tool bit and a slot through an exterior wall of the shaft in communication with the cavity, a retention member received in the slot, and a sleeve axially moveable relative to the shaft between a first position where the retention member moves radially inward to engage and retain the tool bit in the cavity of the shaft, and a second position where the retention member moves radially outward to enable removal of the tool bit from the shaft, wherein the chuck is selectively operated in one of a working mode, when the sleeve is in the first position, and a chucking mode, when the sleeve is in the second position, wherein the power tool further comprises a driving device which drives the chuck sleeve to move axially along the longitudinal axis between the first position corresponding to the working mode and the second position corresponding to the chucking mode, and wherein the driving device comprises an actuator at least partially exterior of the housing and moveable in a direction parallel to the axial movement of the chuck sleeve along the longitudinal axis between the first position and the second position, and a mechanical mechanism between the actuator and the sleeve to transmit movement from the actuator and the sleeve.