Boring or penetrating the earth – Processes – Boring horizontal bores
Reexamination Certificate
1999-06-08
2001-06-26
Pezzuto, Robert E. (Department: 3671)
Boring or penetrating the earth
Processes
Boring horizontal bores
Reexamination Certificate
active
06250404
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to boring heads, and in particular to directional boring head assemblies for drilling horizontal boreholes underground.
SUMMARY OF THE INVENTION
The present invention is directed to a directional boring head assembly for use with a boring machine capable of directionally drilling horizontal underground boreholes, wherein the boring machine includes a drill string with an end for supporting a directional boring head assembly. The directional boring head assembly comprises a directional boring head and cutting member. The directional boring head has a rear end, a forward portion, and a body portion therebetween. The rear end is releasably connectable to the end of the drill string and the forward portion has a slot therethrough. The cutting member has a planar rear portion, a forward end, and a body portion therebetween. The planar rear portion of the cutting member is insertable into the slot of the directional boring head, and the forward end has a cutting edge. The cutting member is releasably connectable to the directional boring head. The directional boring head is provided with a deflection surface inclined at an angle relative to the longitudinal axis of the directional boring head. A portion of the cutting member extends beyond the forward portion of the directional boring head.
The present invention further includes a directional boring head for use with a boring machine capable of directionally drilling horizontal underground boreholes, wherein the boring machine includes a drill string with an end for supporting a boring head. The directional boring head has a rear end, a forward portion, and a body portion therebetween. The rear end is releasably connectable to the end of the drill string. The forward portion has a slot therethrough adapted to receive a releasable cutting member. The directional boring head is provided with a deflection surface inclined at an angle relative to the longitudinal axis of the directional boring head.
The present invention further includes a directional boring machine capable of directionally drilling horizontal underground boreholes. The directional boring machine comprises a drill string with an end for supporting a directional boring head assembly, means for intermittently rotating and axially advancing the drill string and a directional boring head assembly. The directional boring head assembly comprises a directional boring head and a cutting member releasably connectable to the directional boring head. The directional boring head has a rear end, a forward portion, and a body portion therebetween. The rear end is releasably connectable to the end of the drill string, and the forward portion has slot therethrough. The cutting member has a planar rear portion insertable into the slot of the directional boring head, and a forward end having a cutting edge. The directional boring head is provided with a deflection surface inclined at an angle relative to the longitudinal axis of the directional boring head, and wherein a portion of the cutting member extends beyond the forward portion of the directional boring head.
Finally, the present invention includes a directional boring head assembly for use with a boring machine capable of directionally drilling horizontal underground boreholes, wherein the boring machine includes a drill string with an end for supporting a directional boring head assembly. The directional boring head assembly comprises a directional boring head having a rear end, a forward portion, a body portion therebetween, a forward edge and a single planar cutting blade. The rear end of the directional boring head is releasably connectable to the end of the drill string, and the forward portion defines a deflection surface. The deflection surface is inclined at an angle and terminates at the forward edge. The single planar cutting blade is non-parallel to the longitudinal axis and to the deflection surface of the directional boring head.
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McKinney & Stringer, P.C.
Pezzuto Robert E.
The Charles Machine Works, Inc.
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