Patent Number: 6,308,789

Title: Drill bit for directional drilling

Abstract: A drill bit that is arranged to change the direction of drilling. A cone head is rotatably mounted on a shank portion extending from an elongate housing. When the housing is rotated, the cone head generates a concave hole. When a change in direction is required, the housing is rotated a few degrees in one direction and then counter-rotated in the opposite direction. This generates a partial but redirected pilot hole that is also substantially concave in configuration. Continued full rotation causes the drill bit to follow the partial pilot hole in the new direction.

Inventors: Kuenzi; Neal A. (Silverton, OR), Kuenzi; Rodney R. (Silverton, OR)


International Classification: E21B 7/04 (20060101); E21B 7/06 (20060101); E21B 10/16 (20060101); E21B 10/08 (20060101); E21B 007/08 ()

Expiration Date: 10/30/2018