Directional multi-blade boring head

Details Directional multi-blade boring head Directional multi-blade boring head

E - Fixed Constructions

21

B

E21B 4/00 (2006.01) E21B 7/06 (2006.01) E21B 7/26 (2006.01) E21B 10/08 (2006.01) E21B 10/20 (2006.01) E21B 10/42 (2006.01) E21B 10/54 (2006.01) E21B 10/60 (2006.01) E21B 10/62 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2116267

55 DIRECTIONAL MULTI-BLADE BORING HEAD ABSTRACT Directional multi-blade boring heads (1000, 1050) are disclosed which have first and second blades (1030, 1032) which each define a deflecting surface (1036, 1038) for deflecting the boring head when the head is advanced without rotation. At least one intermediate blade (1034) extends between the deflecting surfaces in a three blade design. In a four blade design, a second intermediate blade (1042) extends on the side opposite the first intermediate blade (1034). The boring head is particularly effective in drilling a straight borehole through a variety of soil conditions when the boring head is simultaneously rotated and advanced along the direction of boring.

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