| 摘要 |
A steering head for use with an auger and a casing engaged to the auger, the steering head comprising: a generally cylindrical body having a first body end and a second body end mountable to the casing, a bore channel concentrically received in the body, a front lip, a rear lip, a body surface, and a lead edge; an outer tube having an internal side covering the body surface and an opposing external side; a steering flap disposed on the external side of the outer tube having a first flap face and a second flap face, a distal end, and a hinge end, the steering flap disposable in a retracted position and an extended position; a biased hinge operative to retract the steering flap into the retracted position; and a powered actuator operative to extend the first flap face into the extended position. |
