Drilling apparatus

Details Drilling apparatus Drilling apparatus

1976-08-09

1978-07-25

Leppink, James A.

Boring or penetrating the earth

With orienting or racking means for unconnected tools or...

81 5716, 81 5734, B25B 2300, E21B 1900

Patent

active

041024141

ABSTRACT:
A drilling apparatus adapted to have a drill string releasably secured thereto and including improved means for selectively locking such a drill string against axial rotation.

REFERENCES:
patent: 3270823 (1966-09-01), Buehler
patent: 3446284 (1969-05-01), Dyer et al.
patent: 3463247 (1969-08-01), Klein
patent: 3771389 (1973-11-01), Coyne
patent: 3976149 (1976-08-01), Granholm et al.
patent: 3980143 (1976-09-01), Swartz et al.

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