Drilling device for producing drilled holes with undercut

摘要

Drilling devices for producing undercut drilled holes are known, said devices having a conical shape. To safeguard the drilled-hole mouth against damage and also to facilitate the swivelling-out during the performance of the swivelling movements to produce undercut drilled holes, while having to take account of the vibrations occurring in the course of the drilling operation, there is proposed a drilling device in which the drilling shank is located in a stop sleeve. In the region of the stop sleeve, the drilling shank has a collar, on the underside of which there are situated two concave curved washers lying loosely around the drilling shank. These washers take account of the swivelling movements and also, owing to their spring bearing, the vibrations occurring during the drilling operation and the discharge of drilling dust in the inner region.