Patent ID: 7131506

Claim:
A rock auger comprising: a drive shaft having a longitudinal axis, means at one end of said drive shaft for connecting a first end of said drive shaft to a power driven unit and a cutting head mounted on and projecting from a second end of said drive shaft, said cutting head including a side wall connecting a top edge and a bottom edge defining a tubular body disposed co-axial with said drive shaft and terminating in a free outer end spaced a selected distance from the second end of said drive shaft, a plurality of conical teeth mounted on said bottom edge of said side wall and extending from the free end thereof in an array about the periphery of an opening of selected diameter into a cavity defined by said side wall, said cavity being of selected depth for receiving therein a plug cut from said material by said teeth as said tubular body is rotated about said axis, said side wall having at least one opening extending from said top edge of said tubular body a selected distance there through forming a cutaway portion extending downwardly from said top edge.