Patent ID: 7721861

Claim:
A clutch mechanism for adjusting eccentricity in a power tool comprising: a principle drive shaft; an eccentric shaft driveable by the principle drive shaft, wherein the eccentric shaft is disposed eccentrically to the drive shaft and comprises a recess; an annular main body mounted radially on the eccentric shaft, wherein the annular main body comprises an axial projection formed on an end face which is cooperable with the recess on the eccentric shaft; an outer race mounted radially on the annular main body; at least one first connecting member disposed between the outer race and the annular main body such that when the principle drive shaft is locked the outer race and the annular main body are rotatable together in a common direction; and at least one second connecting member disposed between the annular main body and the eccentric shaft such that when the principle drive shaft rotates the annular main body and the eccentric shaft are rotatable together in a common direction.