Patent ID: 9199316
Filing Date: 2015-12-01
Classification: B23B,B28D,E21B,Y10T

Abstract:
1. A rock drilling tool for rotational percussive machining of concrete, rock, masonry, and such materials, comprising: a drill head which includes a cutting body, and a helix arranged between the drill head and a shaft, wherein the cutting body extends in an uninterrupted manner over a nominal diameter of the rock drilling tool, wherein the cutting body includes an inner region configured as a centering tip and an outer region adjoining the centering tip in the radial direction, wherein the outer region is set back in the effective direction of the rock drilling tool in relation to the centering tip, wherein the centering tip is configured as a pyramid or as a truncated pyramid and has pyramidal edges, wherein side surfaces lie between the pyramidal edges, wherein a longitudinal center axis of the drilling tool passes through a tip of the pyramid or of the truncated pyramid, wherein at least one side surface of the centering tip is configured as a cavity, and wherein a cavity lying in front of the pyramidal edge in the direction of rotation of the rock drilling tool is configured as a face cavity, wherein a cavity lying behind the pyramidal edge in the direction of rotation of the rock drilling tool is configured as a flank cavity, and wherein the face cavity has an ascension that is different than an ascension of the flank cavity.