Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
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
Farber Martin A.
Favreau Richard E.
Gebrueder Heller
Purser Ernest R.
LandOfFree
Drill for rock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drill for rock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill for rock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2399664