Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate
2007-10-30
2010-06-22
Bagnell, David J. (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
C310S323180, C310S323190
Reexamination Certificate
active
07740088
ABSTRACT:
A mechanism for drilling or coring by a combination of sonic hammering and rotation. The drill includes a hammering section with a set of preload weights mounted atop a hammering actuator and an axial passage through the hammering section. In addition, a rotary section includes a motor coupled to a drive shaft that traverses the axial passage through the hammering section. A drill bit is coupled to the drive shaft for drilling by a combination of sonic hammering and rotation. The drill bit includes a fluted shaft leading to a distal crown cutter with teeth. The bit penetrates sampled media by repeated hammering action. In addition, the bit is rotated. As it rotates the fluted bit carries powdered cuttings helically upward along the side of the bit to the surface.
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Merriam-Webster Dictionary's definition of “vibrating” “oscillate” and “hammering”, accessed Feb. 26, 2010.
Badescu Mircea
Bao Xiaoqi
Bar-Cohen Yoseph
Kassab Steve
Sherrit Stewart
Bagnell David J.
Homer Mark
Michener Blake
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