US 12,281,522 B2
Percussive drill bit
Anthony Lachance, Burlington (CA); Adrian Brubacher, North Bay (CA); and Mark Bily, Milton (CA)
Assigned to Boart Longyear Manufacturing And Distribution Inc., Salt Lake City, UT (US)
Filed by BOART LONGYEAR COMPANY, Salt Lake City, UT (US)
Filed on Sep. 28, 2023, as Appl. No. 18/476,462.
Claims priority of provisional application 63/411,304, filed on Sep. 29, 2022.
Prior Publication US 2024/0110445 A1, Apr. 4, 2024
Int. Cl. E21B 10/38 (2006.01); E21B 10/36 (2006.01); E21B 10/60 (2006.01)
CPC E21B 10/36 (2013.01) 20 Claims
OG exemplary drawing
 
1. A drill bit for cutting a hole in a formation, the drill bit having a longitudinal axis extending through a center of the drill bit, wherein a plane including the longitudinal axis of the drill bit bisects the drill bit and divides the drill bit into first and second sides, wherein the drill bit comprises:
a shank defining an interior space;
a crown coupled to the shank, the crown comprising:
a circumferential outer surface;
a cutting face; and
at least one bore that extends through the crown from the interior space of the shank to the cutting face, each bore having an outlet defined by the cutting face, wherein each outlet has a perimeter defined by an intersection between the bore and the cutting face,
wherein the cutting face defines a face channel that extends to the circumferential outer surface of the crown, wherein the face channel comprises an outlet where the face channel meets the circumferential outer surface of the crown, wherein the longitudinal axis intersects the face channel,
wherein greater than 50% of the perimeter of the outlet of each bore of the at least one bore is positioned on the first side of the drill bit, and wherein the outlet of the face channel is on the second side of the drill bit, and
wherein the face channel is defined by a base surface and a peripheral inner wall that extends distally from the base surface, wherein the outlet of each bore of the at least one bore is enclosed within a volume defined by and within the peripheral inner wall and the outlet of the face channel.