Patent ID: 7980322
Filing Date: 2011-07-19
Classification: E21B

Abstract:
1. An impact adapter for an impact driver wherein said impact driver comprises a drifter connected to a rock drill and guidingly displaceable along a boom, said drifter being adapted to convert a rotational drive of said rock drill to a high frequency percussion movement of a shank thereof, displacement means to displace said drifter along said boom, said impact adapter comprising a boom coupling for securing said adapter in co-operating alignment with said shank, said adapter having a casing for slidingly receiving and guiding an anvil therein from a top open end thereof, said anvil being a solid steel mass, said casing having an opening in a bottom end adapted for receiving a top end section of a pile, tube or rod in said casing, anvil support means in said casing to retain said anvil therein in the absence of said top end section of said pile, tube or rod, said casing having a predetermined length above said anvil support means to permit displacement of said anvil and said top section of said pile, tube or rod captive thereabove, and guide means at said bottom end of said casing for guidingly positioning a free top end of said top end section of the pile, tube or rod in said opening at said bottom end of said casing to position said free top end on a bottom face of said anvil.