Patent ID: 9260928
Filing Date: 2016-02-16
CPC Classification: E21B

Claim Text:
1. A drill rig traverse system for a drill rig having a drill tower, a rotation head linearly traversable on the drill tower, and a travelling sheave trolley supported on the drill tower for linear motion along the drill tower and coupled to the rotation head wherein a force applied in one direction to the travelling sheave trolley is transferred as a force action in an opposite direction to the rotation head, the drill rig traverse system comprising: ram traverse system having a plurality of rams capable of applying selectively variable force symmetrically to the travelling sheave trolley in either direction along the drill tower, wherein the selectively variable force is transferred by the travelling sheave trolley to the rotation head to apply both pull down and pull back force to the rotation head, the ram traverse system being arranged to traverse the rotation head for substantially a full length of an associated tower; and, a winch pull back system selectively engagable with the rotation head to provide additional pull back force to the rotation head, the winch pull back system having a winch that in use is mounted on the tower.