Carl S Back

US Patent:

50943022, Mar 10, 1992

Filed:

Jun 15, 1990

Appl. No.:

7/539355

Inventors:

Carl F. Back - Fort Myers FL

Assignee:

Laibe Supply Corporation - Indianapolis IN

International Classification:

E21B 702

US Classification:

173 28

Abstract:

A mobile drilling rig includes a rectangular tube which is used for the derrick and is normally transported on the vehicle in a generally horizontal attitude. The derrick is pivoted to vertical position by a hydraulic cylinder. A pulldown system located inside the tube includes a double-acting hydraulic pulldown cylinder, drive pinions mounted to the piston rod, one gear rack fixed inside the tube and another gear rack slidable inside the tube. A drill-driving powerhead is slidably mounted on the outside of the tube and is connected to the slidable gear rack. The pinions connected to the pulldown cylinder piston rod engage both racks and, with a piston stroke less than half the length of the tube, drive the power head essentially the full length of the tube for the pull-down function.

US Patent:

49711628, Nov 20, 1990

Filed:

Dec 18, 1989

Appl. No.:

7/451929

Inventors:

Carl F. Back - Fort Myers FL

International Classification:

E21B 420

US Classification:

175103

Abstract:

A continuous feed system for a drill comprising a down-hole drill assembly having a support end and a drilling bit. Rotation is imported to the down-hole drill assembly between the support end and the drilling bit, which results in a torque being applied to the support end. A vertically disposed support chain has two ends, one end of the chain is connected to the support end. The chain resists the torque with limited torsional flexibility. A drive interacts with the chain at a point between the two ends for positively providing axial extension of a length of the chain.