Derrick tilting system

Details Derrick tilting system Derrick tilting system

E - Fixed Constructions

21

B

255/35, 255/50

E21B 3/02 (2006.01) E21B 15/00 (2006.01) E21B 15/04 (2006.01)

Patent

CA 1039705

Abstract of the Disclosure A shaft drilling machine generally includes a pivotable power swivel supported on a drilling assembly moved along a mast by hydraulic cylinders. improved means for positioning the mast include a screw jack assembly with one end adapted to be secured to the power swivel and the other end secured to the base of the machine -2-

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