Automatic sequencing system for earth drilling machine

Abstract From the Canadian patent

The invention relates to the field of earth drilling machines of the type having a boom mounted adjacent a mast to move a tubular between a lower, horizontal boom position and an upper vertical boom position and which also includes a lifter configured to move a length of downhole tubular between a lower lifter position and an upper lifter position aligned with the lower boom position. The prior art required manual coordination of operations of the lifter and boom which was inefficient and led to operator fatigue and error. The invention solves this problem by providing au automatic sequencing system to automatically coordinate movement of the lifter and the boom to reduce or eliminate …