Drill rod thread form

Details Drill rod thread form Drill rod thread form

F - Mech Eng,Light,Heat,Weapons

16

D

64/20

F16D 3/50 (2006.01)

Patent

CA 1037730

ABSTRACT A thread structure for use in coupling percussion drill- ing extension rods minimizes the torque necessary to disconnect such extension rods. This is accomplished by beveling the crest portions of the cooperating thread structures. The direc- tion of the bevel is such that the greatest intrusion of the crest portions into the complementary portions of the cooperat- ing thread structure occurs immediately adjacent the abutting flanks thereof. The abutting flanks then wear in such a way that wedging is substantially avoided. Additionally, the root portions are defined by a continuously curved surface that smoothly extends into a flat surface defining the thread flanks so that fatigue stresses are minimized.

247340

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