E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/34
E21B 15/00 (2006.01) E21B 7/02 (2006.01)
Patent
CA 1190920
ABSTRACT A mobile drilling apparatus having a support structure, a mast positioned on said support structure, a drill head and a hydraulic assembly vertically operable on and guided by said mast. The hydraulic assembly moves the drill head and includes lower hydraulic cylinders rigidly connected to the mast and upper cylinders, each mounted inside and connected rigidly to a tube. A piston rod with connected upper and lower pistons is movable within the upper and lower hydraulic cylinders. The drill head is connected to the lower portion of the tube.
422153
Bralorne Resources Limited
Uren John Russell
LandOfFree
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