Patent ID: 7950200

Claim:
An apparatus comprising: a drilling device having a first end and a second end, wherein a point is located at the first end of the drilling device, wherein the drilling device comprises a drill bar and a modified auger device disposed on said drill bar, wherein said modified auger, device comprises a helical member comprising a leading edge, a terminal edge, and a common surface extending between the leading edge and the terminal edge that is continuous along the length of the helical member over at least a portion of the radius of the helical member, wherein a downwardly oriented flap is formed in said helical member as a partial discontinuity in the surface of the helical member between the leading edge and the terminal edge, such that the flap defines a supplemental leading edge disposed on said flap and a supplemental trailing edge disposed on at least a portion of the radius of the helical member, wherein said supplemental leading edge and said supplemental trailing edge are located on the same side of said drill bar, said supplemental leading edge is proximal to and substantially aligned with said supplemental trailing edge in the direction of the longitudinal axis of the drill bar, and there is substantially no offset between said supplemental leading edge and said supplemental trailing edge in the direction of the transverse axis of the drill bar; a tube having a first end and a second end, wherein the first end of the tube is connected to the second end of the drilling device, and having a solid interior portion forming a longitudinal cavity having a cross-sectional shape; an insertion bar having a first end and a second end, the first end of the insertion bar slideably inserted into the second end of the tube so that the insertion bar lies at least partially in the tube and has a cross-sectional shape corresponding to the cross-sectional shape of the cavity formed in the interior portion of the tube, so that a substantial portion of the insertion bar is slideably insertable within the tube and the amount of the insertion bar that is inserted within the tube is selectably adjustable; and a latching device affixed to said second end of said tube which can set a location of the insertion bar with respect to the tube so that a height is set, wherein the height is measured from the second end of the insertion bar to the point at the first end of the drilling device.