Patent ID: 7530881

Claim:
An eccentric stroke adjusting mechanism for use in a power tool, comprising: a principle drive shaft having a central axis; a first eccentric member mounted radially on the principle drive shaft, the first eccentric member having a first central axis; a second eccentric member mounted radially on the principle drive shaft, the second eccentric member having a second central axis; a coupling member for coupling the first eccentric member to the second eccentric member, wherein the eccentricity of the first central axis and the eccentricity of the second central axis with respect to the central axis of the principle drive shaft are adjustable; wherein the central axis, the first central axis, and the second central axis are in a common plane; and wherein the first eccentric member has a first eccentric sleeve, the second eccentric member has a second eccentric sleeve and the first eccentric sleeve and the second eccentric sleeve are rotatable relative to the principle drive shaft, wherein a central axis of the first eccentric sleeve is the first central axis of the first eccentric member and a central axis of the second eccentric sleeve is the second central axis of the second eccentric member.