Patent ID: 9714543
Date: 2017-07-25
CPC Classifications: E21B

Claim:
1. An assembly comprising a drill bit, wherein the drill bit comprises a drill bit gauge at or near a drilling end thereof, and a connection means for connecting the drill bit to a motor shaft of a drill motor assembly having a tubular motor body portion, wherein a lower end portion of the motor shaft is disposed substantially within a lower end portion of the motor body portion, wherein the connection means comprises an externally threaded pin configured for extending into the lower end portion of the motor body portion and engaging, connecting or engaging and connecting with an internal thread of the lower end portion of the motor shaft, the internal thread of the lower end portion of the motor shaft being provided within or inside the motor body portion, and wherein the drill bit gauge comprises a substantially cylindrical portion having a length less than or equal to approximately 1.0 times the nominal bit diameter.