| 摘要 |
A drill bit for use with a percussion drilling apparatus can include an elongated body with a first end, a second end, and a longitudinal surface extending between the first and second ends. A plurality of splines extends along the longitudinal surface of the drill bit internally, and at least one of the splines has an apex, a root, and a planar surface between the apex and root. The planar surface can be oriented at an angle to a plane extending from a center of the drill bit to a midpoint of the apex. The internal splines of the hammer bit correspond to external splines in a hammer casing. |
