Drill for making a pole in the ground and method applying...

Details Drill for making a pole in the ground and method applying... Drill for making a pole in the ground and method applying...

E - Fixed Constructions

21

B

E21B 7/02 (2006.01) E02D 5/36 (2006.01) E02D 5/56 (2006.01) E02D 7/22 (2006.01) E21B 10/44 (2006.01)

Patent

CA 2214552

Drill for making a pole in the ground, whereby this drill (9) is provided with a passage (15) and whereby this drill has at the bottom a screw-shaped displacement part (11) of which the outside increases in radius upwardly, up to a diameter larger than that of the drill tube (8), characterised in that the displacement part (11) passes with its upper extremity into a cylindrical part (12) which is provided on its mantle with at least a screw blade (13) which runs in the shape of a screw in the same direction as the displacement part (11), but of which the pitch (S2) is larger than the pitch (S1) of the displacement part (11).

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