Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate
2007-05-22
2007-05-22
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
With tool drive prime mover or above-ground mechanical...
With installing casing
C175S045000, C175S073000
Reexamination Certificate
active
10939558
ABSTRACT:
A steering head that comprises a forward pivot block and a rearward pivot block. The forward pivot block is attached to a leading edge of a casing. The rearward pivot block is attached to a trailing portion of the casing, the leading edge being separated from the trailing portion by a gap in the casing. Extending between the forward and rearward pivot blocks is a central drive shaft. The central drive shaft includes a threaded portion and is rotatable to move a drive nut away from or towards the rearward pivot block. The central drive shaft, to either side of the drive nut, is covered by a cylindrical sleeve. A second internal sleeve extends between the rearward pivot block and the drive nut to protect the threads of the drive shaft from earthen debris when the casing is being advanced or reversed to steer the forward-most casing portion during operation.
REFERENCES:
patent: 3938597 (1976-02-01), Richmond et al.
patent: 4013134 (1977-03-01), Richmond et al.
patent: 4977967 (1990-12-01), Alston et al.
patent: 5470132 (1995-11-01), Cartwright
Bergin Patrick M.
Heino Joseph S.
Tsay Frank
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