Boring or penetrating the earth – Combined
Patent
1981-09-04
1983-09-27
Purser, Ernest R.
Boring or penetrating the earth
Combined
175 40, 408 68, 408204, E21B 1200
Patent
active
044063342
ABSTRACT:
A drilling tool has a drilling shaft member, a crown drilling member with an annular wall provided with a plurality of cutting edges and detachably mounted on the shaft member, a center drilling member detachably mounted on the shaft member inside the crown drilling member and having a further cutting edge, and elements for limiting a drilling depth of the tool when the center drilling member is mounted on the shaft member. Thereby, the operator of the drilling tool, after drilling a guiding groove in a rock, is forced to remove the center drilling member from the drilling tool and drill further without the center drilling member, which increases the drilling efficiency.
REFERENCES:
patent: 1234467 (1917-07-01), Hamilton
patent: 1365660 (1921-01-01), Collier
patent: 2484150 (1949-10-01), Brown
patent: 2886291 (1959-05-01), Frisby
patent: 3833073 (1974-09-01), Carver
patent: 4078622 (1978-03-01), Taylor-Myers
patent: 4101238 (1978-07-01), Reibetanz et al.
Baumann Otto
Dohse Hans-Peter
Reibetanz Wilbert
Wanner Karl
Bui Thuy M.
Purser Ernest R.
Robert & Bosch GmbH
Striker Michael J.
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