Extraction device for pneumatically actuated drilling tools

Details Extraction device for pneumatically actuated drilling tools Extraction device for pneumatically actuated drilling tools

E - Fixed Constructions

21

B

255/91

E21B 31/00 (2006.01) E21B 4/14 (2006.01) E21B 31/113 (2006.01)

Patent

CA 1261819

A B S T R A C T The invention relates to an extraction device used for extracting pneumatically actuated impact tools and the like from boreholes. The device includes a carrier member 1, a reciprocable hammer 2, and a sleeve 13. The carrier is adapted to be connected to a drill rod section. Reciprocation of the hammer relative to the carrier may be used to effect extraction. Fluid passages are provided for conveying fluid under pressure through the device in order to cause the hammer to reciprocate.

533480

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