Device for retrieving pneumatically actuated percussion tools from boreholes

摘要

The device for retrieving is a special embodiment of the invention of South African Patent 85/0484. The device is used for retrieving drilling tools from a borehole. The device has a support element (1), a hammer (2) capable of moving to and fro and a sleeve (13). Fluid channels (5, 6, 11, 12, 16) are provided to convey fluid under pressure through the device in order to set the hammer (2) into a to-and-fro movement. <IMAGE>