Patent ID: 8317574

Claim:
A power-driven hand tool comprising: a housing; a work spindle for driving a tool; a tool end provided on said work spindle; a fixing mechanism for fixing a tool between said fixing mechanism and said tool end; a displacing mechanism having a clamping lever configured for pivoting about a pivot axis for displacing said fixing mechanism between a releasing position, in which said fixing mechanism can be released from said work spindle, and a clamping position in which said fixing mechanism is clamped on said work spindle by means of a spring; and an impeding mechanism, interacting with said clamping lever for impeding the pivoting movement of said clamping lever between said releasing position and said clamping position; wherein said impeding mechanism comprises: at least one elastic impeding element configured as a metal spring; and a counter-contour configured for moving relative to said elastic impeding element; wherein said counter-contour is configured for frictionally engaging said elastic impeding element along the entire range between said releasing position and said clamping position; and wherein said counter-contour comprises a locking element for locking said impeding element when being in said clamping position.