Boring or penetrating the earth – With below-ground tool drive prime mover – With mechanical motion-converting means
Reexamination Certificate
2001-12-03
2008-08-12
Chilcot, Jr., Richard E. (Department: 3635)
Boring or penetrating the earth
With below-ground tool drive prime mover
With mechanical motion-converting means
C175S298000, C175S319000, C175S415000, C175S417000, C175S418000
Reexamination Certificate
active
07410013
ABSTRACT:
An apparatus (10) for use in boring is described, the apparatus including a rotatable drive shaft (12), a cam member (20) and followers (16) for converting rotational motion into reciprocal motion, and a shroud (24) having a cutting edge (26) driven by the cam member and followers. The shroud may be selectively engageable with the cam member and followers, allowing the drive shaft to be removed through the shroud. A fluid circulation arrangement (31), (13) allows air to be injected into loose drilling substrate, so assisting removal of drill cuttings from the boring apparatus. Also described is a drill string incorporating a similar arrangement, allowing the drill string to be reciprocated within a bore. The drill string may further include casing sections, which may have intumescent coatings to allow the sections to be fixed in a wellbore.
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Chilcot Jr. Richard E.
Smith Matt J
Steptoe & Johnson LLP
Wave Craft Limited
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