Drill rig

Details Drill rig Drill rig

E - Fixed Constructions

21

B

E21B 7/02 (2006.01) E21B 7/04 (2006.01) E21B 15/04 (2006.01)

Patent

CA 2276220

A drill rig is provided in which a drill boom is supported on the upper of two frames whilst the lower of the two frames supports the rig. The two frames are interconnected by pivoted elongate support members in such a way that the inclination of the upper frame relative to the lower frame varies as the upper frame is raised and lowered. The variation in inclination is such that holes to be drilled automatically assume the required inclination relative to the grade of the development.

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