Anti-vibration tool holder

A tool holder comprising:

• a shank member to be held by a tool spindle of a machine tool;
• a cylindrical body coupled to the shank member;
• an attachment hole formed in a radially inner portion of the body;
• an anti-vibration device fitted to a radially outer portion of the body;
• and
• a bolt,
• wherein a straight shank of a cutting tool is inserted into the attachment hole, the bolt is inserted in a radial direction through the anti-vibration device to fix the straight shank of the cutting tool to the attachment hole of the body, wherein the anti-vibration device includes:
• a ring-shaped first anti-vibration member fitted to the radially outer portion of the body of the anti-vibration holder;
• a cylindrical second anti-vibration member fitted to the radially outer portion of the first anti-vibration member;
• and
• four O-rings arranged at radially inner and outer portions at both ends of the first anti-vibration member, wherein
• each end of the first anti-vibration member has a trapezoidal cross-sectional shape,
• the O-rings are each arranged on one of the inner and outer circumferential surfaces of the ends of the first anti-vibration member, and
• the first anti-vibration member is in contact with two of the O-rings in a wedge-like manner.