Patent ID: 8113299

Claim:
An assembly for articulating a mast operatively associated with a drill rig, comprising: a boom having a first end and a second end, said first end being adapted to be coupled to the drill rig, and said second end being adapted to be coupled to the mast; a lifter operatively associated with said boom, wherein variation of a length of said lifter causes said boom to rotate about said first end of said boom thereby raising or lowering the mast; a mast tilt cylinder operatively associated with the mast, wherein variation of a length of said mast tilt cylinder orients the mast into a drilling angle relative to a vertical axis; and an articulation assembly pivotally coupled to said boom, said articulation assembly being adapted to pivot upon variation of the length of said lifter thereby maintaining the drilling angle of the mast as the mast is raised or lowered without varying the length of said mast tilt cylinder.