Drill bit for trenchless drilling

A drill bit for trenchless drilling comprising:

• a generally flat bit body including first and second side surfaces separated from one another by a thickness of the bit body, the bit body further including a front cutting end, and a rear mounting end adapted to be mounted to a rotary drill string, the bit body defining a longitudinal center axis extending through the mounting end and the cutting end;
• the cutting end including a front edge, and first and second grooves formed in the first and second side surfaces, respectively, each groove defining a generally forwardly facing shoulder spaced rearwardly from the front edge and being exposed to the front edge by a plurality of slots formed in the respective first and second side surfaces, each slot extending from the front edge of a respective groove in a direction oriented generally radially with reference to the front edge, the slots associated with each groove being spaced apart from one another along the front edge by lands formed by the bit body, each land including a rear end spaced forwardly from and facing the respective shoulder, the grooves and the slots extending only partially through the thickness of the bit body from the respective first and second side surfaces, wherein the bit body defines a floor extending from each shoulder to the front edge;
• and
• first and second sets of cutting teeth mounted to respective ones of the first and second side surfaces and disposed on opposite sides of the axis, each tooth including a front cutting end, and a rear mounting portion mounted in a respective one of the slots, wherein each mounting portion rests upon the floor associated with the respective slot, and a rear end of each tooth abuts against a respective one of the shoulders, the first set of teeth being arranged asymmetrically relative to the second set of teeth with reference to the axis.