Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent
1990-12-24
1992-05-12
Melius, Terry Lee
Boring or penetrating the earth
Tool removable or insertable through or around driving or...
Laterally shiftable cutter element movable through shaft
175269, 175291, 175384, E21B 1066
Patent
active
051118939
ABSTRACT:
A device for drilling and lining holes in earth bores wherein a casing is intended to be lowered into the bore along with the drilling unit. The drilling unit is mounted on a rotating drill. The drilling unit includes a plurality of cutters which can be arranged in the extended active position or can be retracted to a passive position arranged within the casing of the drilling unit. Drilling fluid through an activating piston repositions the cutters between the passive and the active position. The drilling unit includes a gripping device which contacts a groove in the casing which carries the casing down the bore with the drilling unit. Threaded ribs within the drilling unit act as a pump to maintain down hole drilling fluid pressure. A valve is provided in conjunction with the cutters whereby when the cutters are moved to the active position the valve will open allowing flow of the drilling fluid.
REFERENCES:
patent: 2719701 (1955-10-01), Kammerer, Jr.
patent: 3169592 (1965-02-01), Kammerer
patent: 4470470 (1984-09-01), Takano
patent: 4544041 (1985-10-01), Rinaldi
Melius Terry Lee
Pittenger James E.
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