Drill for rock

Details Drill for rock Drill for rock

1975-03-12

1976-06-01

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175390, 175398, 175410, 175415, E21C 1308

Patent

active

039602230

ABSTRACT:
A drill for rock comprising a boring head arranged on one end of a drill shank and having radially projecting wings, an axial centering projection which projects in a boring direction in front of the wings, said wings and said projection constituting carriers of eccentrically arranged cutter bodies and a centering cutter body, respectively. Breaker surfaces are formed on the wing surfaces between the cutter bodies, respectively, pointing to the centering point of the centering cutter body. Each surface of the boring head located between the wings has at least one jacket line which extends longitudinally to the axis of the boring head and directly joins to a jacket line of the outer surface of the centering projection and is inclined relative thereto at an obtuse angle.

REFERENCES:
patent: 1169369 (1916-01-01), Wakfer
patent: 1746423 (1930-02-01), Hartman
patent: 2578593 (1951-12-01), Phipps
patent: 2759705 (1956-08-01), Bjorkman
patent: 2879037 (1959-03-01), Wolfram
patent: 3118511 (1964-01-01), Kay
patent: 3372763 (1968-03-01), Fischer

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