Apparatus for obtaining earth cores

Details Apparatus for obtaining earth cores Apparatus for obtaining earth cores

1975-11-14

1976-06-22

Purser, Ernest R.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Providing identifiable indication of core position in situ...

175106, 175230, 175255, 175320, E21B 920

Patent

active

039645550

ABSTRACT:
An apparatus for obtaining earth samples of soil or rock from the bottom of holes previously drilled in the earth, the apparatus having an outer and inner non-rotatable casing and a rotatable intermediate casing wherein the intermediate casing is provided with a cutter head fixed to the outer end thereof, including a rotatable hollow shaft adapted to rotate the intermediate casing through a reduction gear train and to supply water or other drill fluid under predetermined pressures to the apparatus, the outer casing having expandable earth engaging arms operatable by the water or fluid pressure received from the hollow shaft for engaging the side wall of the previously bored hole formed in the earth wherein the earth engaging arms will prevent rotation of the outer and inner casing while the hollow shaft is rotating the intermediate casing, and means carried within the outer casing for supporting the gear train, including means incorporated within the apparatus for marking the azimuth of the core, and means for retrieving the oriented core within the inner casing while the apparatus is being removed from the bored hole.

REFERENCES:
patent: 1484065 (1924-02-01), Gould
patent: 1773915 (1930-08-01), Lydon
patent: 2313576 (1943-03-01), Phillips et al.
patent: 2324682 (1943-07-01), De Long
patent: 2859938 (1958-11-01), Boucher
patent: 3225843 (1965-12-01), Ortloff et al.
patent: 3241623 (1966-03-01), Martinez

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