公开(公告)号：EP4234878A1

公开(公告)日：2023-08-30

申请号：EP23176873.0

申请日：2020-08-17

申请人： Vermeer Manufacturing Company

发明人： SMITH, Jacob Richard ,  LANGENFELD, Michael David ,  DORIN, Tyler J.

IPC分类号： E21B7/04 ,  E21B7/20 ,  E21B7/30 ,  E21B10/42 ,  E21B10/62 ,  E21B12/00 ,  F16L1/028

摘要： A rotary drill bit for use with a horizontal directional drill string. A coupler at a proximal axial end is configured to attach the rotary drill bit to a drill head at a distal end of the drill string. A cutting portion at a distal axial end is provided with a plurality of vanes with respective cutters that operate to cut a hole in earth when the rotary drill bit is rotated about a central axis. The plurality of vanes project radially outwardly from a surface of the cutting portion such that the surface forms respective troughs circumferentially interspersed with the plurality of vanes. A plurality of engagement features is positioned axially within the cutting portion and radially inward of an outer cutting diameter to facilitate attachment of a product pullback device between the plurality of vanes without removing the rotary drill bit, or any portion thereof, from the drill head.