Thread coupling for a drill string for percussive rock drilling

Details Thread coupling for a drill string for percussive rock drilling Thread coupling for a drill string for percussive rock drilling

E - Fixed Constructions

21

B

E21B 17/042 (2006.01)

Patent

CA 2345707

The thread coupling is provided with a male thread (4) and a female thread (5) cooperating therewith. The male thread is arranged on a first drill string element (3) provided with a first impact surface (6). The female thread is arranged on a second drill string element (2) which is provided with a second impact surface (7). The male thread (4) has an axially variable pitch. And the female thread (5) has a thread opening (8) which is wider than the crest (9) of the male thread.

Cette invention concerne un raccord fileté pour train de tiges utilisé dans le perçage à percussion. Ce raccord fileté comporte une filetage mâle (4) et un filetage femelle (5) correspondant. Le filetage mâle se trouve sur un premier élément de tige (3) présentant une première surface d'impact (6), et le filetage femelle sur un second élément de tige (2) présentant une seconde surface d'impact (7). Le filetage mâle (4) présente un pas variable axialement et le filet femelle (5) une gorge (8) plus large que la crête (9) du filet mâle.

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