Patent ID: 7661912
Filing Date: 2010-02-16
Classification: B23B,B23C,Y10T

Abstract:
1. A tool having a damper, comprising: a tool body, including a hollow part extending in an axial direction in the tool body; a pair of ring-shaped elastic members; a substantially cylindrical weight part mounted in the hollow part, such that the weight part is held by a rod, and the weight part can be moved relative to the tool body through the pair of ring-shaped elastic members; a ring-shaped spacer having a stiffness, that is disposed between the ring-shaped elastic members at an outside end of the weight part, that contacts said ring-shaped elastic members at opposite ends of the ring-shaped spacer, and wherein the outside of the ring-shaped spacer defines an inner surface of the hollow part of the tool body; a unit held by the rod, for moving the ring-shaped spacer in the axial direction; and an hermetically-sealed annular space that is filled with a viscous fluid, provided at an end of the weight part in the axial direction, and axial ends of the annular space being defined by the pair of ring shaped elastic members.