Tool driving or impacting – With vehicle support for drive – Pivoted
Patent
1996-12-02
1997-12-16
Hail, III, Joseph J.
Tool driving or impacting
With vehicle support for drive
Pivoted
173186, 173 28, 173148, 173152, F21B 702
Patent
active
056974574
ABSTRACT:
A mobile drilling rig has a rectangular tubular derrick or mast normally transported on the truck in a generally horizontal attitude. The mast is pivoted to vertical at the drilling site. A drill rotating power head is connected to a pull-down system located inside the mast tube and which includes a rectangular guide tube slidably mounted inside the mast tube, and two double-acting hydraulic cylinder assemblies situated in a telescoping arrangement with one cylinder assembly inside the other. A cylinder inside the inner hydraulic cylinder assembly has a closed upper end secured to the upper end of the guide tube and serves as a piston rod connected to the power head. The overall stroke of the pull-down system is greater than the typical conventional length of pipe in a drill string to facilitate adding and removing lengths of pipe. The power head is floating mounted to the guide tube.
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Hail III Joseph J.
Laibe Supply Corporation
Stelacone Jay A.
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