F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
64/20
F16D 1/02 (2006.01) E21B 17/042 (2006.01) F16B 33/02 (2006.01)
Patent
CA 1122424
A B S T R A C T A coupling thread structure for percussion drill elements including a rod having an external thread and a sleeve having an internal thread with the threads, when the sleeve and rod are coupled, having abutting and non-abutting flanks and with the flanks being joined by bottom and crest portions, wherein the threads have at least two starts; the abutting flanks are substantially straight along their whole abutting contact portions and form an angle of between 10°and 25°, preferably 15° to 20°, with the drill axis; the pitch angle of the threads is in the range 9° to 20°, preferably 11° to 16°; the crest portions are substantially straight and intersect the abutting flank portions at a well defined edge ; the non-abutting flanks have a flank angle which is considerably greater than that of the abutting flanks ; the flank angle of the non-abutting flanks is in the range 50° to 80°, preferably 65°to 75°, with respect to the drill axis; and the bottom portions of the threads are curved.
336031
Boart International Limited
Gowling Lafleur Henderson Llp
LandOfFree
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