主权项 |
1. A rotary drill bit for engaging an earth strata material, the rotary drill bit comprising:
an elongate drill bit body having an axial forward end and an axial rearward end, the drill bit body containing a slot at the forward end; an edge protector received in the slot of the drill bit body, the edge protector comprising:
a first side having a first bottom edge and a first top edge;a second side opposed to the first side, the second side having a second bottom edge and a second top edge; anda bottom portion adjoining the first bottom edge of the first side and the second bottom edge of the second side; and a cutting insert having an elongate insert body rotatable about a central axis, the elongate insert body having a pair of symmetrical halves symmetrical about the central axis, each symmetrical half comprising:
a leading face;a top surface; anda cutting edge formed between the leading face and the top surface, wherein the cutting insert is received in the edge protector such that the cutting edge is recessed below one of the first top edge of the first side or the second top edge of the second side. |