CUTTING GRAIN FOR DRILL, IN PARTICULAR FOR MASONRY AND ROCK, AND DRILL BIT EQUIPPED WITH SUCH CUTTING GRAIN

摘要

P DRILL BIT FOR USE IN DRILLING MASONRY AND STONE AND TYPE CONVENTIONALLY COMPRISING A TIP DEFINED BY THE INTERSECTION OF A FIRST AND A SECOND SURFACE, AND ALSO COMPRISING FRONT SURFACES AND FLANK PLACED ON OPPOSITE COTES OF THE SAME POINT TO DEFINE TWO CORNS RESPECTIVELY LOCATED AT THE INTERSECTION OF THE EDGES BEFORE SAID SURFACES; AT LEAST ONE OF THE FRONT EDGES, CONSIDERING THE DIRECTION OF THE ROTATION OF THE FOREST, THIS GRAIN IS CHANFREIN ALONG THE INTERSECTION OF SAID FRONT AND FLANK SURFACES 43, 44 SO AS TO CREATE DOUBLE INTERSECTIONS 46, 47, 52, 53, ADJACENT TO THE MOST ADVANCED PART OF GRAIN 1. / P P THE LIFETIME AND EFFICIENCY OF CUTTING GRAIN ARE ENHANCED. / P