BigPatents India

The invention relates to a tool coupler for connecting a replaceable tool head to a machine tool comprising an at least partly or fully conical or cylindrical hollow shaft and a ring-shaped collar interacting with a correspondingly configured receiving bore hole and a ring-shaped opposite surface of a basic holder on a machine tool, where the basic holder and the tool coupler can be locked by means of clamping elements actuated via a clamping device in such a way that the collar of the tool coupler abuts on the opposite surface of the basic holder, and the tool coupler is provided with a continuous gripper groove for a gripping device used in automatic tool replacement. According to the invention, two diametrically opposite blind bore holes with varying bore hole contours are disposed in the gripper groove. (FIG. 1)