Patent ID: 9551189
Date: 2017-01-24
CPC Classifications: E21B

Claim:
1. A percussion drill bit, said drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the body having a center axis and a cutting face, the cutting face having a frontal flat face, and a beveled face extending outwardly radially therefrom, the body and the cutting face being integrally formed; said drill bit formed of a double chisel design or modified double chisel design configuration; said drill bit capable of operating at a machine torque pressure of less than 20 bar, and at a machine thrust pressure of less than 20 bar; said frontal face and said beveled face having a series of openings provided therein, and inserts being press fitted within said openings in preparation for usage of the drill bit in said drilling operation, each of said inserts having a tip comprising a polycrystalline diamond coating; select of said inserts providing a first set of inserts and others of said inserts forming a second set of inserts; said first set of inserts having a first approximately linear alignment and offset from the center axis of said bit body, and said second set of inserts having a second approximately linear alignment and also offset from the center axis of said bit body, said first and second sets of inserts forming wings of a double chisel, the first and second alignments being at an angle relative to each other; each insert provided in the cutting face of the drill bit positioned at a different radius from the center axis of said bit body than all of the other inserts provided upon said cutting face of the drill bit, each insert in the cutting face being non-tracking relative to all of the other inserts provided upon said cutting face of the drill bit; said drill bit body having a gauge diameter between about 1¼″ inches to 3½″ inches; each insert being of conical shape; and each insert having a gripping portion of a diameter between about 0.300 inches to 0.520 inches, each insert having a grip length of between about 0.290 inches and 0.550 inches, and each tip of each insert having a length of between about 0.200 inches to 0.320 inches, and a conical surface of each tip formed at an angle from the insert grip portion of about 15° to 40° with the vertical of said inserts.