Rock drill

Details Rock drill Rock drill

E - Fixed Constructions

21

B

255/61

E21B 10/36 (2006.01) E21B 17/04 (2006.01) E21B 17/042 (2006.01) F16D 1/06 (2006.01)

Patent

CA 1195317

Abstract A drilling assembly for use in percussion drilling com- prising a drill bit (10) and a drill rod (11) having co- operating conical surfaces (15,16), one of said surfaces being provided with a helically extending thread (17). For purposes of ensuring a reliable connection the thread (17) meets certain geometrical demands and is designed as a left hand thread. Further, the conical surface (16) being provided with the thread (17) is harder than the other conical surface (15).

373350

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