"twin-impact" double-blow drilling apparatus

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/16 (2006.01) E21B 6/04 (2006.01) E21B 7/00 (2006.01) E21B 7/20 (2006.01) E21B 17/03 (2006.01)

Patent

CA 2268400

A drilling apparatus 1 having a twin-impact system can work continuously with a shank end 5 is provided with a compensation ring 10 on the rotary impact side, which has a material with hardness that is lower than that of the material of the pipe and striker 8 and/or corresponding to the adjacent end portion 11 of the shank end 5 and has a shape and/or surfaces 21, 22 to compensate for the applied forces.

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