E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/18 (2006.01) E21B 7/06 (2006.01) E21B 10/56 (2006.01) E21B 10/60 (2006.01) E21B 47/01 (2006.01) E21B 47/12 (2006.01)
Patent
CA 2046417
ABSTRACT OF THE DISCLOSURE 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 said head as an eroding jet stream. The head comprising a body portion coupled to said pipe string and a nose portion hingedly coupled to said body portion with biasing means coupled therebetween to align said head portions. The head when rotated and advanced retains said nose portion and said body portion in alignment due to the rotation of the head and the effect of the biasing means. When advanced without rotation, said nose portion pivoting about the hinged coupling and compressing the biasing means to follow the contour of the cavity ahead of the nose portion. Said body portion and said nose portion returned to alignment when said head is rotated due to said rotation and the recovery of said biasing means.
Kinnan Frank R.
Moffat & Co.
Underground Technologies
LandOfFree
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