A rock drill bit and a thread joint

Details A rock drill bit and a thread joint A rock drill bit and a thread joint

E - Fixed Constructions

21

B

E21B 10/36 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2576145

The present invention relates to a drill bit intended for percussive rock drilling. The drill bit (10) is formed to reduce origin of cavitation at percussive drilling by guiding the flush medium in direction towards a rod (11). The drill bit comprises a skirt (13) integrated with the drill bit (10). The drill bit (10) comprises at least one channel for transport of flush medium, such as water. The drill bit (10) has a front face (29) provided with buttons (31), which define a greatest first external diameter (DO) and a first end face (26) wherein a recess with a female thread a (24) exits, such as a rope or trapezoid thread for percussive drilling. The recess has a depth (LO). The external surface (28) of the skirt (13) comprises a conical portion (15). The conical portion (15) has an axial extension that is greater than an eighth part of the depth (LO) of the recess but smaller than the depth (LO) of the recess. The invention also relates to a thread joint for percussive rock drilling.

L'invention concerne un fleuret conçu pour le forage à percussion de roches. Ce fleuret (10) permet de réduire l'origine d'une cavitation lors du forage à percussion, par le guidage d'un milieu de purge vers une tige (11). Ce fleuret comprend une jupe (13) intégrée et au moins un canal destiné au transport d'un milieu de purge, tel que de l'eau. Le fleuret (10) selon l'invention présente une face avant (29) pourvue de boutons (31), qui définit un premier diamètre externe (D0), le plus grand, et une première face d'extrémité (26) sur laquelle est formé un renfoncement pourvu d'un filet femelle (24), tel qu'un filet de type corde ou trapézoïdal destiné au forage à percussion. Ledit renfoncement présente une profondeur (L0) déterminée. La surface externe (28) de la jupe (13) comprend une partie conique (15). Cette partie conique (15) comporte une extension axiale supérieure à un huitième de la profondeur (L0) du renfoncement, mais inférieure à la profondeur (L0) du renfoncement. L'invention concerne également un joint fileté destiné au forage à percussion de roches.

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