Drill steel

Details Drill steel Drill steel

E - Fixed Constructions

21

B

255/56

E21B 17/00 (2006.01) E21B 10/44 (2006.01) E21B 17/22 (2006.01)

Patent

CA 1255652

Abstract A drill steel (10) for percussion drilling has four longitu- dinally extending grooves (13) for removal of cuttings. The grooves (13) are shaped such that, in comparison with a hexa- gonal drill steel, there is obtained an enlarged space for cuttings and a less consumption of material with maintenance of the same resistance to bending.

490906

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