Boring or penetrating the earth – Boring without earth removal
Patent
1982-03-12
1983-08-16
Purser, Ernest R.
Boring or penetrating the earth
Boring without earth removal
175 21, 173 91, E21B 726
Patent
active
043986099
ABSTRACT:
A specific feature of the apparatus according to the invention which incorates 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.
REFERENCES:
patent: 1403766 (1922-01-01), Gillies
patent: 3550698 (1970-12-01), Pauley
patent: 4171727 (1979-10-01), Tkack et al.
patent: 4295533 (1981-10-01), Schmidt
Chepurnoi Nikolai P.
Cherednikov Evgeny N.
Karavaev Andron T.
Plavskikh Vladimir D.
Sukhushin Anatoly V.
Adams Bruce L.
Bui Thuy M.
Burns Robert E.
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
Lobato Emamual LJ.
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