Down-the-hole percussion hammer

Details Down-the-hole percussion hammer Down-the-hole percussion hammer

E - Fixed Constructions

21

B

255/13

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

Patent

CA 1178943

DOWN-THE-HOLE PERCUSSION HAMMER Abstract of the Invention A drill bit for a percussion hammer having a short tubular member extending upwardly from the anvil surface of the bit for sealingly engaging a like-sized bore in the hammer piston. The tubular member defines an annular recessed area on its external wall extending axially upwardly from adjacent the anvil surface to provide a volume for non-compressible liquid splashed onto the member from between the striking surfaces and thereby reduces stress forces on the relatively soft member.

404941

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