DRILL BIT CUTTER WITH MILLED CUTTING STRUCTURE Russian patent published in 2008 - IPC E21B10/16 

FIELD: drilling equipment, particularly drill bits characterized by tooth form or arrangement.

SUBSTANCE: cutter comprises milled cutting structure made as prismatic teeth with transversal partitions adjoining tooth sides and tooth row groove bottoms. Partition tops are spaced a distance equal to 30-55% of prismatic tooth height from tooth row groove bottoms and are connected to prismatic tooth mid-lengths. Partition cross-sections defined in plane of tooth valley symmetry form corner with straight or curved sides and defined by acute angle. In another variant partitions alternate with tooth row grooves and comprise no partitions to create prismatic tooth stiffening ribs only from one, namely right or left, side. In the case of odd number of prismatic teeth connected to cutter top one tooth is provided with transversal partitions connected to both sides thereof.

EFFECT: increased penetration speed.

3 cl, 4 dwg