Boring head for a subsurface soil-boring apparatus

Details Boring head for a subsurface soil-boring apparatus Boring head for a subsurface soil-boring apparatus

1990-11-08

1992-05-12

Britts, Ramon S.

Boring or penetrating the earth

Boring without earth removal

Fluid passage to exterior of drive point

175 45, E21B 726

Patent

active

051118912

ABSTRACT:
A steerable subsurface soil-boring head arranged to be rotated and advanced by a pipe string operated by an above-surface drilling apparatus which also provides a supply of high-pressure fluid emitted from a nozzle in the head as an eroding jet stream. The head comprising a body portion coupled to a pipe string and a nose portion hingedly coupled to the body portion with a biasing mechanism coupled therebetween to align the head portions. The head when rotated and advanced retains the nose portion and body portion in alignment due to the rotation of the head and the effect of the biasing mechanism. When advanced without rotation, the nose portion pivots about the hinged coupling and compresses the biasing mechanism to follow the contour of the cavity ahead of the nose portion. The body portion and the nose portion return to alignment when the head is rotated due to rotation and recovery of the biasing mechanism.

REFERENCES:
patent: 3131778 (1964-05-01), Emerson et al.
patent: 3572839 (1971-03-01), Okabe
patent: 3797586 (1974-03-01), Coyne et al.
patent: 4013134 (1977-03-01), Richmond et al.
patent: 4042046 (1977-08-01), Capoccia
patent: 4258800 (1981-03-01), Hipp
patent: 5002138 (1991-03-01), Smet

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