Rotary percussive core drill bit

Details Rotary percussive core drill bit Rotary percussive core drill bit

E - Fixed Constructions

21

B

E21B 10/02 (2006.01) E21B 10/04 (2006.01) E21B 10/36 (2006.01) E21B 10/38 (2006.01) E21B 10/56 (2006.01) E21B 21/12 (2006.01)

Patent

CA 2159903

A drill bit for a drill system using a down-the-hole reverse circulation percussive hammer with at least one aperture (5a) in a cutting face of the drill bit, the aperture communicating with a return conduit (4), with a part only of the aperture being located and shaped so as to coincide with an axial centre (8) of the drill but such that as the drill bit is rotated about the central axis, the aperture in the drill bit will define an un-cut area (5) which is coaxial with the central axis of the drill bit, and a clearance space (6) offset from the un-cut area.

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