Directional drill hammer pullback device

摘要

A pull back 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 pull back 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 pull back adapter through the first passage of the cutting face and inserting the second member of the pull back 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 pull back 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. A pull back adapter for use with a hammer used in horizontal directional drilling operations, the hammer comprising a drill bit comprising a cutting face, an internal cavity, a first passage, and a second passage, the pull back adapter comprising:
an attachment member; a first member connected to the attachment member and disposed in the first passage and the internal cavity; and a second member connected to the attachment member and disposed in the second passage and the internal cavity and connected to the first member within the internal cavity to hold the attachment member for movement with the drill bit.