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) F16L 15/06 (2006.01)

Patent

CA 2345575

Thread coupling for a drill string for percussive drilling. The thread coupling is provided with a male thread (5) and a female thread (4) 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 threads are conical. Furthermore the crests (8) of the male thread (5) have a radius of curvature which is more than 30 % of the pitch of the thread.

Cette invention concerne un raccord fileté pour train de tiges utilisé dans le perçage à percussion. Ce raccord fileté comporte une filetage mâle (5) et un filetage femelle (4) 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). Les filetages sont du type conique. Par ailleurs, les crêtes (8) du filet mâle (5) présentent un rayon de courbure qui dépasse les 30 % du pas du filet.

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