Patent ID: 8122978

Claim:
A drilling device for providing a shaped cavity in a bore hole, said drilling device comprising: a shank for attachment to a drill; a reverse threaded section, said reverse threaded section attached to said shank; a cutting head, said cutting head rotatably attached to said reverse threaded section, said cutting head having extendable cutting blades for providing the shaped cavity, said cutting head further having a cutting tip thereon for boring the bore hole, wherein said cutting head comprises a substantially cylindrical body having an internal chamber therein with a cutting tip located at a top of said cylindrical body; a plurality of clean out flutes located on a side of said cylindrical body, said plurality of clean out flutes being bi-directional in cleaning of debris from said cutting head; said extendable cutting blades mounted within said internal chamber of said cutting head body; and means for extending said cutting blades through said side of said body.