Drilling tool e.g. drill bit, has a cutting element that defines first envelope during rotation of second cutting element, while defining a second envelope which lies axially downstream of first envelope as viewed along rotational axis

摘要

The drill bit (1) comprises a working surface (12) that includes several hard cutting elements (6,14) which are arranged in protruding manner from the working surface, and a first envelope (91a) defining a mating face. The first cutting element (91) defines the first envelope during the rotation of a second cutting element (92) about the axis of rotation (16), while defining a second envelope (92a) which lies axially downstream of the first envelope as viewed along the rotational axis.