Tool for excavating an object

Details Tool for excavating an object Tool for excavating an object

2008-01-29

2008-01-29

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Miscellaneous

C166S222000

Reexamination Certificate

active

07322433

ABSTRACT:
A Tool for excavating an object, the tool havinga jetting system arranged to impinge the object to be excavated with a jetted stream of a drilling fluid mixed with abrasive particles, the jetting system being provided with at least a mixing chamber with a drilling fluid inlet, a second inlet for abrasive particles, and an outlet nozzle for releasing the drilling fluid mixed with the abrasive particles;a recirculation system arranged to recirculate at least some of the abrasive particles, from a return stream of the fluid mixed with the abrasive particles downstream impingement of the jet with the object back to the jetting system, whereby the abrasive particles have a magnetic material, which recirculation system has a separator magnet for separating the abrasive particles from the return stream and for transporting the particles to the second inlet; and,a piece of magnetic material that is provided in or in the vicinity of the mixing chamber such as to draw a part of the magnetic field generated by the separator magnet into the mixing chamber.

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