A percussive down-the-hole hammer and a drill bit

Details A percussive down-the-hole hammer and a drill bit A percussive down-the-hole hammer and a drill bit

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) E21B 10/38 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2260547

The present invention relates to a percussive down-the-hole hammer and a drill bit. The drill bit (13) comprises a body having a front drilling face, a central passageway (18) extending from a rear end (30) of the body in direction towards the drilling face to conduct flushing medium to the drilling face. The rear end comprises an impact surface (24) surrounding the passageway (18). The central passageway (18) is adapted to receive a foot valve (20) to transfer pressurized air through the drill bit. The intersection of the drill bit (13) impact surface (24) and the drill bit passageway (18) is provided with a circumferential projection (25) integrated with the drill bit (13) to deflect jet streams of water during drilling.

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