Rotary tool, particularly a drill, and a cutting head for such a rotary tool

A cutting head for a rotary tool, wherein the cutting head extends in an axial direction along an axis of rotation, the cutting head comprising:

• a front end surface;
• and
• a coupling pin for being fastened in a pin receptacle of a carrier;
• the coupling pin comprising:
• clamping surfaces for radially centering the coupling pin and for transmitting a radial clamping force;
• and
• stop surfaces for axial pull-out prevention;
• and
• the cutting head further comprising lateral surfaces disposed adjacent to the stop surfaces;
• wherein each of the lateral surfaces extends, with respect to the axial direction, to a front end portion of the lateral surface and toward the front end surface of the cutting head;
• wherein, when viewed with respect to the axial direction, the front end surface of the cutting head does not overlap the front end portion of each of the lateral surfaces;
• wherein the stop surfaces of the coupling pin are disposed axially closer to the front end surface of the cutting head than are the clamping surfaces of the coupling pin;
• and
• wherein the stop surfaces form axially upper boundary surfaces of at least a portion of the coupling pin, in a direction defined axially toward the front end of the cutting head.

A rotary tool which extends in an axial direction along an axis of rotation, the rotary drill comprising:

• a carrier;
• a cutting head which is interchangeably attached to the carrier and comprises a front end surface;
• the carrier comprising fastening webs which define a pin receptacle;
• the cutting head comprising a coupling pin which is insertable into the pin receptacle via rotating the cutting head relative to the carrier to thereby form, via a press fit, a clamping connection between the cutting head and the carrier;
• the coupling pin and the fastening webs each comprise clamping surfaces, wherein the clamping surfaces of the coupling pin and of the fastening webs interact with each other to radially center the coupling pin and to transmit a radial clamping force;
• the pin receptacle and the coupling pin each comprising stop surfaces, wherein the stop surfaces of the pin receptacle and of the coupling pin interact with each other for axial pull-out prevention;
• wherein the cutting head includes lateral surfaces disposed adjacent to the stop surfaces of the coupling pin;
• each of the lateral surfaces extending, generally axially, to a front end portion thereof and toward the front end surface of the cutting head;
• wherein, when viewed with respect to the axial direction, the front end surface of the cutting head does not overlap the front end portion of each of the lateral surfaces;
• and
• wherein the stop surfaces of the coupling pin are disposed axially closer to the front end surface of the cutting head than are the clamping surfaces of the coupling pin;
• each of the lateral surfaces extending over a transverse direction and over a longitudinal direction;
• wherein the transverse direction is orthogonal to the axial direction, and the longitudinal direction is inclined at a non-zero inclination angle with respect to the axial direction;
• the cutting head comprising flutes;
• each of the lateral surfaces extending to at least one of the flutes;
• and
• each of the flutes extending to a circumferential minor cutting edge opposite one of the lateral surfaces;
• wherein each of the circumferential minor cutting edges lies behind a plane which is spanned by a corresponding one of the lateral surfaces, such that the plane does not touch the cutting head in a region of the minor cutting edge.