Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1975-12-05
1977-11-15
Purser, Ernest R.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
64 2R, 173131, 175320, E21C 1500
Patent
active
040581764
ABSTRACT:
A tool and a method for drilling holes having an increased cross-sectional area in a region remote from an exposed surface of the support structure in which the holes are to be drilled include mounting a drill bit having cutting edges at one end of a resiliently-deflectable, elongated force-transmitting spring, and angularly displacing an other end of the elongated force-transmitting spring so as to resiliently deflect said one end thereof into a plurality of positions in each of which the cutting edges of the drill bit are brought into engagement with the inner circumferential wall of the hole being drilled so as to form undercut surfaces in said region.
REFERENCES:
patent: 919808 (1909-04-01), Bales
patent: 1485036 (1924-02-01), Kingsley
patent: 2388741 (1945-11-01), Hays
patent: 2441881 (1948-05-01), Hays
patent: 2765149 (1956-10-01), Christodolu
patent: 3118159 (1964-01-01), Kollmann
patent: 3934428 (1976-01-01), Hedin
Fischer Artur
Fischer Klaus
Fischer Artur
Purser Ernest R.
Striker Michael J.
LandOfFree
Tool and method for drilling a hole with an increased cross-sect does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tool and method for drilling a hole with an increased cross-sect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tool and method for drilling a hole with an increased cross-sect will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1716257