Tool for formation of holes in macroporous compressible soils

Details Tool for formation of holes in macroporous compressible soils Tool for formation of holes in macroporous compressible soils

1982-07-12

1984-11-27

Novosad, Stephen J.

Boring or penetrating the earth

Boring without earth removal

175394, 175 21, E21B 726

Patent

active

044846401

ABSTRACT:
A tool for the formation of holes without extracting the soil comprises a body having a cylindrical calibrating portion, coaxial portions with surfaces for the compaction of the soil and radii decreasing stepwise in the direction away from the calibrating portion, and terminating in an end piece. The body has also transition portions with surfaces for the compaction of the soil, forming a smooth transition from a coaxial portion with a larger radius to an adjacent coaxial portion with a smaller radius. The surface for the compaction of the soil of each coaxial portion is a conical surface having the configuration of a ribbon wound from the calibrating portion to the end piece and comprising the transition portions.

REFERENCES:
patent: 1166153 (1915-12-01), Ridley et al.
patent: 1639731 (1927-08-01), Hamiston

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