Thread coupling for drill string elements for percussion...

Details Thread coupling for drill string elements for percussion... Thread coupling for drill string elements for percussion...

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 35/00 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2126027

Thread coupling for drill string elements for percussion drilling. The thread coupling comprises a first drill string element (1) provided with a sleeve formed part (2) having an internal thread (3) and a free end (4) for cooperation with a second drill string element (6) provided with a stop face (10) and a spigot (7) with an external thread (8). The free end (4} and the stop face (10) are hardened during manufacturing, preferably through case-hardening, to a depth of at least 2 mm. Furthermore, the sleeve formed part (2) and the spigot (7) are given such dimensions during manufacturing that a bottom play (A) of 1.1-2.0 mm, preferably 1.1-1.5 mm, is obtained when coupling newly made drill string elements.

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