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US 6,659,198 B2Granted
Back reamer assembly
AssigneeS & S Trust
InventorDavid Camp
Life of this patent
Estimating the term…
Abstract
The backreamer assembly for enlarging shallow depth boreholes in an earthen environment includes a substantially conical cutting surface. Contained within the substantially conical cutting surface is a speed reduction, torque increasing gearbox which transmits rotational power from a drive motor to the substantially conical cutting surface.
Claims16
A back reamer assembly for enlarging an existing borehole formed in an earthen environment, said back reamer assembly comprising:
- a substantially conical means for cutting into the earthen environment;
- means for rotating said substantially conical means for cutting into the earthen environment, said means for rotating including:
- a speed reduction, torque increasing gearbox constructed and arranged to be substantially contained within said substantially conical means for cutting into the earthen environment;
- means for supplying rotational force to said speed reduction, torque increasing gearbox.
1 more element
A method for enlarging a borehole having a proximal end and a distal end, said borehole being previously formed in an earthen environment, said method comprising the steps of:
- inserting a string of an elongated cylindrical member through the borehole;
- mounting a back reaming tool assembly on said elongated cylindrical member at said distal end of said borehole, said back reaming tool assembly including:
- a substantially conical means for cutting into said earthen environment;
- means for rotating said substantially conical mean for cutting into the earthen environment, said means for rotating including;
- a speed reduction, torque increasing gearbox constructed and arranged to be substantially contained within said substantially conical means for cutting into the earthen environment
- means for supplying rotational force to said speed reduction, torque increasing gearbox;
- rotating the substantially conical means for cutting into the earthen environment of said back reaming tool with said means for supplying rotational force to said speed reduction, torque increasing gearbox;
- placing tension force on said elongated cylindrical member to pull said back reaming tool through the previously drilled borehole.
5 more elements
Dependencies are inferred from the claim text.