Rock drill

Details Rock drill Rock drill

1985-07-10

1988-03-08

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175410, 175411, 175414, E21B 1046, E21B 1026

Patent

active

047294418

ABSTRACT:
A rock drill in which the depth of the recessed groove for accommodating the cutting body is made greater than the axial brazing-in depth of the cutting body whereby a largely stress-free seating of the cutting body results. In particular, for rock drills for making break-throughs, this recessed groove extended in the radial direction into lobes of a drill head can be used for locating cutting bodies in the lobes.

REFERENCES:
patent: 2030576 (1936-02-01), Erickson
patent: 2101376 (1937-12-01), Voigtlander
patent: 2341314 (1944-02-01), Clark
patent: 2522045 (1950-09-01), Knowles
patent: 2707619 (1955-05-01), Andersson
patent: 2777672 (1957-01-01), Haglund et al.
patent: 3459073 (1969-08-01), Conover
patent: 3549337 (1970-12-01), Palmer
patent: 3960223 (1976-06-01), Kleine
patent: 4190127 (1980-02-01), Wolf
patent: 4294319 (1981-10-01), Guergen

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