Boring or penetrating the earth – Bit or bit element – Core forming type
Patent
1995-09-27
1997-05-13
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Core forming type
1754201, 175426, E21B 1048, E21B 1058
Patent
active
056283768
ABSTRACT:
A drilling bit includes a carrier member (3) shaped, for instance, as a hollow annular crown. In such a crown several cutter members (4) are distributed angularly apart around the circumferentially extending leading end of the carrier member. The cutter members (4) project both radially outwardly and inwardly from the wall thickness of the carrier member. A step (S) is formed in the cutter members spaced from the leading end thereof opposite of the drilling direction. The step (S) is located at the trailing end of a region (K) with a continuous reduction in the radial dimension (R) of the cutter member and the radial dimension is further reduced at the step. Due to the further reduction in the radial dimension at the step (S), the length of the cutter member (4) in the drilling direction, causing friction with the wall surface of the borehole to be drilled, is limited after extended use of the drilling bit, so that the drilling bit retains a higher drilling efficiency even after such extended use.
REFERENCES:
patent: 1112498 (1914-10-01), Van Es
patent: 1204805 (1916-11-01), MacDonald
patent: 2998086 (1961-08-01), Demo
Dang Hoang C.
Hilti Aktiengesellschaft
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