Drill head and method for chambering blind drill-holes

Drill head comprising a body with a rear end and a front end, the body having, at the rear end, a mechanical interface for connection to a drill tube and, at the front end, a projection extending in the axial direction,

• with a central slider which can be displaced in the axial direction being guided in the projection,
• with at least one third recess extending in the radial direction being formed in the projection, with a cutting slider being guided in every third recess,
• the central slider and the at least one cutting slider being coupled to one another in such a way that a relative movement between the central slider and the body causes a radial advancing movement of the cutting slider or sliders,
• characterized in that
• at least one second recess extending in the radial direction and in parallel with the at least one third recess is formed in the projection,
• in that a drag slider is guided in the second recess or recesses in each case, and in that in each case
• a cutting slider and a drag slider are coupled to one another in such a way that advancing movements of the drag slider are transmitted to the cutting slider coupled thereto.