Core sampling drill

Details Core sampling drill Core sampling drill

1975-06-06

1976-09-21

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Core forming type

175 60, E21B 4900

Patent

active

039813711

ABSTRACT:
A core sampling drill comprising a drill bit having a series of cutting surfaces arranged around a central core hole, the upper end of the drill bit being threaded so that it can be fitted to the lower end of a tubular drill stem, a core tube positioned within the lower end of the drill stem substantially concentric therewith and spaced apart therefrom to provide an outer annular passage, the inner portion of the outer wall of the drill bit being provided with an annular recess which is arcuate in cross section so that air flowing downwardly through the outer annular passage is turned through approximately 180.degree. and directed upwardly into the core tube so that the material cut by the drill bit is entrained therein and carried into the core tube.

REFERENCES:
patent: 2485098 (1949-10-01), Johnson
patent: 3208538 (1965-09-01), Pitcher
patent: 3331455 (1967-07-01), Anderson, Jr. et al.
patent: 3807514 (1974-04-01), Murrell

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