Drag bit excavation

Details Drag bit excavation Drag bit excavation

E - Fixed Constructions

21

C

262/55

E21C 27/22 (2006.01) E21C 29/24 (2006.01) E21C 41/00 (2006.01)

Patent

CA 1078882

ABSTRACT OF THE DISCLOSURE A drag bit excavating device comprising a core extend- ing along an axis; a bit carrier supported on the core; cutter bits supported by the carrier along a three dimensional spiral having constant pitch and increasing radius along at least a portion of the axis, the carrier being relieved to provide radially extending spaces between the turns of the spiral; a frame support- ing the core, carrier, and bits for rotation about and advance along the axis; and a drive to provide rotation, where- by the bits slot the material to be excavated while the material between portions of the resulting slot extends into the spaces to be subsequently broken away.

289246

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