Percussion drill bit

Details Percussion drill bit Percussion drill bit

E - Fixed Constructions

21

B

255/84

E21B 10/00 (2006.01) B25D 17/02 (2006.01) E21B 17/00 (2006.01) E21B 17/04 (2006.01) E21B 17/042 (2006.01) E21B 17/046 (2006.01)

Patent

CA 1038856

PERCUSSION DRILL BIT Abstract of the Disclosure A drill bit for use in percussion drilling comprising a solid bit body having one or more cutting edges at its front end and a centrally provided rod receiving hole having a conical internal surface. The hole is bottomed in the bit and comprises a cylindrical internal surface in front of said conical surface, and the cylindrical surface has an internal thread located at a distance from the bottom of said hole.

249433

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