Boring or penetrating the earth – Tool actuation by reaction of rotating eccentric mass
Reexamination Certificate
2011-08-30
2011-08-30
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Tool actuation by reaction of rotating eccentric mass
Reexamination Certificate
active
08006782
ABSTRACT:
A drill head assembly includes a shaft having a shaft axis, an oscillator assembly operatively associated with the shaft, the oscillator assembly having at least one eccentrically weighted rotor configured to rotate about a pivot point to generate an oscillating vibratory force, wherein an oscillation centerline is defined transverse to the shaft axis and including the pivot point. The drill head assembly also includes a lower bearing coupled to the shaft on a first side of the oscillation centerline and an upper bearing coupled to the shaft on a second side of the oscillation centerline, the second side being opposite the first side.
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Able Robert Eugene
Altrichter Kenneth Carl
Drivdahl Kristian S.
Nevenner Todd A.
Gay Jennifer H
Longyear TM, Inc.
Wallace Kipp C
Workman Nydegger
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