Apparatus for recovering ground soil samples

Details Apparatus for recovering ground soil samples Apparatus for recovering ground soil samples

1989-05-05

1990-09-04

Noland, Tom

Boring or penetrating the earth

Boring without earth removal

Combined with earth removal

175249, E21B 2510

Patent

active

049536370

ABSTRACT:
The apparatus includes a sample-holder comprising a tube (16) of thin aluminum, and a piston (12) slidable in the tube. The piston is mounted on a solid, robust piston rod (14). To drive the apparatus down to the depth at which the sample is to be taken, the piston and tube are locked together, and travel down in unison, most of the force of the hammer blows being taken by the robust piston rod. When sampling depth is reached, the piston rod (14) is uncoupled, and the piston (12) is restrained by means of a cable (36) to the surface; further hammering now drives only the tube (16) downwards, not the piston. The tube being thin, the drive force is must less, whereby the tube does not collapse, as the sample enters the tube.

REFERENCES:
patent: 4161988 (1979-07-01), Hart
patent: 4284150 (1981-08-01), Davis
patent: 4332541 (1982-06-01), Doty
patent: 4400970 (1983-08-01), Ali
patent: 4685339 (1987-08-01), Philipenko

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