Patent ID: 7641000

Claim:
A drilling arrangement for drilling a borehole in the earth, the arrangement comprising: a) a drill string defining a first axis of rotation; and b) a boring head attached to an end of the drill string, the boring head including: i) a transmitter for measuring the relative position of the boring head to the drill string; ii) an offset coupling interconnected to the transmitter, wherein the offset coupling includes a first end having an axis of rotation that is aligned with the first axis of rotation and a second end configured to define a second axis of rotation that is offset from the first axis of rotation at a predetermined angle; iii) a bit drive element having an axis of rotation that is aligned with the second axis of rotation, the bit drive element including a one-way clutch; and iv) a drill bit interconnected to the bit drive element; wherein the one-way clutch is located between the bit and the offset coupling.