Neal A Kuenzi

US Patent:

63087898, Oct 30, 2001

Filed:

Oct 26, 1999

Appl. No.:

9/427534

Inventors:

Neal A. Kuenzi - Silverton OR
Rodney R. Kuenzi - Silverton OR

International Classification:

E21B 708

US Classification:

175 61

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.