GESTEINSBOHRER

摘要

A drill, especially a masonry and rock drill, in which a fluted shank has a transverse slot in the working end and a hard cutting plate seated in the slot and retained therein by a pin removably mounted in the shank. The cutting plate may be indexable in the slot to expose respective regions thereof for cutting operations. The cutting plate engages the bottom of the slot and is supported thereby. The engagement of the cutting plate by the bottom and side walls of the slot and by the pin holds the cutting plate against displacement in the slot.