Patent ID: 6129159
Filing Date: 2000-10-10
Classification: E21B

Abstract:
A vibratory drill head apparatus for use with drilling apparatus including a drill stand and a drill shaft, extending along a drilling axis, the vibratory drill head comprising:(a) a housing releasably coupled to the drill stand and to the drill shaft;(b) a pair of drive shafts mounted in the housing for rotation about spaced parallel drive axes perpendicular to the drilling axis;(c) a pair of eccentric cams for exerting vibratory forces on the housing when the drive shafts are rotated, wherein each of the eccentric cams is rigidly mounted on one of the drive shafts, the drive shafts being spaced to allow for rotation of the cams;(d) motor means for counter-rotating the drive shafts at the same speed, thereby synchronizing the vibratory forces generated by the eccentric cams along the drilling axis; and(e) coupling means for coupling the housing to the drill shaft, wherein the coupling means comprises a coupling member extending downwardly from the housing which slidingly fits over a coupling member extending upwardly from the drill shaft.