Extraction device for pneumatically actuated drilling tools

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

1991-01-14

1991-11-19

Watts, Douglas D.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173134, E02D 900

Patent

active

050658239

ABSTRACT:
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 secton. 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.

REFERENCES:
patent: 711859 (1902-10-01), Holden
patent: 3511325 (1970-05-01), Schmidt
patent: 4114950 (1978-09-01), Cooper

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