Rock drill

Details Rock drill Rock drill

B - Operations, Transporting

25

D

138/40.13

B25D 9/12 (2006.01) E21B 21/01 (2006.01)

Patent

CA 1060311

ABSTRACT OF THE DISCLOSURE A percussive rock drill and more particularly a percussive rock drill having improved means for passing a flow of flushing fluid therethrough. The rock drill is powered by a fluid motor including a body member with an elongated chamber defined within the member and having a first portion intermediate second and third portions thereof. A working member is reciprocable within the first portion. A port is provided for introducing a flow of pressurized liquid within the second and third portions and a seal is provided for sealing the first portion from the flow of pressurized liquid within the second and third portions. A charge of gas is maintained within at least a part of the first portion and communicates with the seal at a pressure greater than the pressure of the liquid. The arrangement is such that in the event of a water tube seal failure the entry of flushing liquid thereinto is guarded against.

262861

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