Detachable drill bit for impact drilling

Details Detachable drill bit for impact drilling Detachable drill bit for impact drilling

E - Fixed Constructions

21

B

255/46, 255/84

E21B 10/00 (2006.01) E21B 4/14 (2006.01) E21B 10/56 (2006.01) E21B 17/042 (2006.01)

Patent

CA 1058607

ABSTRACT OF THE DISCLOSURE An impact drilling apparatus has an anvil insaid a casing for receiving impact blows from a hammer. The lower end of the anvil is threadably connected to a drill bit having an external load bearing shoulder. On the lower end of the casing is attached a driver guide sub which extends downwardly around the threaded connection between the drill bit and anvil to bear on the external load bearing shoulder for transmitting down weight to the bit and simultaneously counteracting lateral forces acting on the bit and anvil. A spline connection is provided between the driver guide sub and the anvil. In the off bottom position, a shoulder of the anvil comes to rest against the top of the driver guide sub which stops the reciprocating action of the hammer while drilling fluid continues to flow.

261534

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