Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Reexamination Certificate
2005-09-27
2005-09-27
Singh, Sunil (Department: 3673)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
C299S022000, C299S023000
Reexamination Certificate
active
06948573
ABSTRACT:
The device for breaking rocks includes a hollow cylindrical chamber having a closed lower end, a closed upper end and an access aperture in the closed upper end and an outer circumstantial surface. A cylindrical plunger is longitudinally-reciprocally disposed within the interior of the cylindrical chamber, has a converging portion and is biased to a retracted position. Four spools are equally disposed around the circumference of the cylindrical plunger, each spool including a converging upper end which is configured to be in slidable contact with the converging portion of the cylindrical plunger. Four hardened inserts are secured to an outer face of an associated spool. Each spool and secured hardened insert is biased to an inner retracted position. Hydraulic pressure is applied to the upper face of the cylindrical plunger to urge the converging portion to move downwardly, thereby urging the spools, together with the secured hardened inserts, radially-outwardly so that the hardened inserts project radially outwardly from the outer surface of the hollow cylindrical chamber whereby the radially-outwardly-projecting inserts can fracture a rock face.
REFERENCES:
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patent: 0305553 (1987-03-01), None
patent: 0306539 (1987-03-01), None
China Carlo B.
China Ferruccio I.
Singh Sunil
Vigil Thomas R.
Welsh & Katz Ltd.
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