F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/77
F15B 21/06 (2006.01) E21B 6/00 (2006.01) E21B 44/06 (2006.01)
Patent
CA 1111738
Abstract of the Disclosure Pressure medium operated control system for a rock drill is described, for preventing the drill steel form getting stuck and for releasing the drill steel if stuck. The system comprises a striking apparatus, a rotation motor and a feed motor with con- trol valves and sources for pressure medium and, at the striking end of the drill steel, a shank adapter which can be brought into striking contact with the striking piston by means of a shank cylinder and thereto connected pressure medium source, also during the return movement of the drill. Pressure medium is fed into the said shank cylinder through a pressure controlled direc- tional control valve which is controlled through the pressure line or the rotation speed of the rotation motor. Reversing of the feed motor from feed of the rock drill into its return movement is caused to take place substantially at the same pressure value of the rotation circuit or at the same rotation speed at which the said directional control valve starts to let pressure medium into the shank cylinder.
327388
Helin Aimo
Salmi Pekka
Bereskin & Parr
Oy Tampella Ab
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