Downhole drill bit and bit coupling

Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft

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Details

175262, 175292, 175415, 408180, 408188, E21B 1026, E21B 1066

Patent

active

049628224

ABSTRACT:
A downhole impact drill having a drill bit head with a drill bit sector for drilling an enlarge hole upon rotation of the drill. The bit is mounted within a chuck for movement between a retracted, working position in which the bit is coaxially mounted for drilling and an extended, non-working position in which the bit is loosely mounted within the chuck to permit the bit to swing laterally to reduce the diameter of the drill bit head envelope. In its extended, non-working position, the bit is supported on the chuck at a 3.degree. angle at which the drill bit sector is positioned inwardly to facilitate installation and withdrawal of the drill.

REFERENCES:
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patent: 3416616 (1967-03-01), Ahlgren
patent: 3648789 (1972-03-01), Ericksson
patent: 3753470 (1973-08-01), Lagerstrom et al.
patent: 3848683 (1974-11-01), Persson
patent: 3870114 (1975-03-01), Pulk et al.
patent: 4408669 (1983-10-01), Wiredal
patent: 4440244 (1984-04-01), Wiredal
patent: 4545443 (1985-10-01), Wiredal
patent: 4620600 (1986-11-01), Persson
patent: 4770259 (1988-09-01), Jansson
patent: 4836306 (1989-06-01), Barrows

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