发明名称 Apparatus for sinking wells in the ground
摘要 A specific feature of the apparatus according to the invention which incorporates a percussion unit to a tail piece whereof there is attached a rope connecting to a means of extracting is that fitted into said tail piece coaxially therewith and with a clearance is a ring, the clearance between said ring and said tail piece containing a resilient member with passages reeved wherethrough are the ends of the rope and the inside surface of said tail piece being provided with stops in the body whereof there are also passages for reeving the ends of the rope.
申请公布号 US4398609(A) 申请公布日期 1983.08.16
申请号 US19820357580 申请日期 1982.03.12
申请人 INSTITUT GORNOGO DELA SIBIRSKOGO OTDELENIA AKADEMII NAUK SSSR 发明人 KARAVAEV, ANDRON T.;PLAVSKIKH, VLADIMIR D.;TERSKOV, ALEXEI D.;SUKHUSHIN, ANATOLY V.;CHEPURNOI, NIKOLAI P.;CHEREDNIKOV, EVGENY N.
分类号 E21B4/06;E21B7/26;(IPC1-7):E21B7/26 主分类号 E21B4/06
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