| 摘要 |
<p>PCT No. PCT/EP89/00256 Sec. 371 Date Nov. 8, 1989 Sec. 102(e) Date Nov. 8, 1989 PCT Filed Mar. 11, 1989 PCT Pub. No. WO89/08769 PCT Pub. Date Sep. 21, 1989.A drilling apparatus, especially for drilling blast holes, includes a carriage, a drilling rod, a pressure-operated drive system movable along the carriage for transmitting a back and forth rotation to the drilling rod, a flushing head arranged on the carriage and movable either with or apart from the drilling rod, and a hydraulically operated in-hole hammer arranged on a front end of the drilling rod.</p> |
