A thread joint for a drill string for percussive rock-drilling

Details A thread joint for a drill string for percussive rock-drilling A thread joint for a drill string for percussive rock-drilling

E - Fixed Constructions

21

B

E21B 17/042 (2006.01)

Patent

CA 2484540

The present invention relates to a screw joint for a drill run or drill string for percussion rock drilling, comprising male and female screw threads (5, 9) on the elements (1, 2) to be joined together to form a drill string. According to the invention the male thread (5) and the female thread (9) have a trapezoidal shape and a slight conical inclination.

L'invention concerne un joint à vis destiné à une opération de forage ou un train de tige destiné à un forage de roches par percussion, qui comprend des filetages mâles et femelles (5, 9) sur les éléments à raccorder destinés à former un train de tiges. Selon l'invention, le filetage mâle (5) et le filetage femelle (9) ont une forme trapézoïdale et une légère inclinaison conique.

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