Boring or penetrating the earth – Processes – Boring horizontal bores
Reissue Patent
2000-01-19
2001-11-20
Will, Thomas B. (Department: 3671)
Boring or penetrating the earth
Processes
Boring horizontal bores
C175S376000
Reissue Patent
active
RE037450
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to a steerable fluid assisted mechanical boring head for drilling substantially horizontal boreholes under a roadway or other obstruction.
BACKGROUND OF THE INVENTION
Using boring machines with a steerable bit or head for drilling horizontal boreholes under a roadway or other obstruction is a well known practice. The process of providing such boreholes is generally referred to as “trenchless” digging, since an open trench is not required. A key to the operation of such a boring device is to have an effective steerable boring bit or head. If the bit is steerable, the operator can redirect the borehole along the proper path if it begins diverting from the desired path, and also allows the operator to steer around obstructions underground.
Many drill bits have been designed which have such a steering feature. However, there is a continuing need to develop boring bits which have better directional control, operate in a variety of soil conditions effectively and provide enhanced cutting action.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, a directional boring bit is illustrated which is capable of axially advancing while the drill string on which the boring bit is mounted is rotated and is capable of moving in a different direction as the drill string rotation is stopped and the drill string and boring bit are thrust forward. The directional boring bit has a body and a deflecting surface on the body at an oblique angle to the central axis rotation of the body. The directional boring bit also has at least one conically shaped rotary cutter or cone mounted thereon to assist in boring.
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Deken Arthur D.
Sewell Cody L.
McKinney & Stringer, P.C.
Petravick M.
The Charles Machine Works, Inc.
Will Thomas B.
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