Thread structure for percussion rock drilling

Details Thread structure for percussion rock drilling Thread structure for percussion rock drilling

F - Mech Eng,Light,Heat,Weapons

16

D

64/20

F16D 1/00 (2006.01) E21B 17/042 (2006.01) F16L 15/00 (2006.01)

Patent

CA 1272386

Abstract A thread structure for interconnecting two elements (10) in a percussion drill string comprising an interior cy- lindrical thread (12) and an exterior cylindrical thread (13). The threads (12,13) have abutting flanks (19,20) which are straight along their abutting contact portions. The clearance (a) between the bottom portion (22) of the exterior thread (13) and the crest portion (24) of the interior thread (12) is large enough to ensure that con- tact does not arise at said clearance when the threads are worn. (Fig. 6)

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