Directional drill hammer pullback device

摘要

A pullback system to install or replace underground utilities that is used with a hammer used in horizontal directional drilling operations. The system comprises a drill bit attached to the hammer. The drill bit comprises a cutting face comprising a first and second passage. The system further comprises a pullback adapter comprising an attachment member, a first member, and a second member. The attachment member may be secured to the cutting face of the drill bit by inserting the first member of the pullback adapter through the first passage of the cutting face and inserting the second member of the pullback adapter through the second passage of the cutting face. The first member secures to the second member within an internal cavity of the drill bit to hold the attachment member for movement with the drill bit. A new pipe may be secured to a shackle on the pullback adapter. The drilling machine will then pull the hammer rearwardly through the borehole which in turn pulls the new pipe into the borehole.

主权项

1. An assembly comprising:
a drill bit comprising:
a body having an internal cavity;a cutting face;a first opening on the cutting face in fluid communication with the internal cavity such that the first opening and the internal cavity form a continuous conduit; anda second opening on the cutting face; a pullback adapter that overlays the cutting face comprising:
a first member disposed in the first opening configured to secure the pullback adapter relative the cutting face; anda second member disposed in the second opening configured to secure the pullback adapter relative the cutting face.