Boring or penetrating the earth – Natural vibration characteristic of an element of boring...
Patent
1979-08-06
1981-06-09
Pate, III, William F.
Boring or penetrating the earth
Natural vibration characteristic of an element of boring...
175105, 418 48, E21B 402
Patent
active
042719151
ABSTRACT:
A drill bit is connected to the bottom end of a longitudinally elastic drill stem which is contained within a jacket. An orbiting mass oscillator is coupled to the drill stem, this oscillator generating vibrational energy at a sonic frequency. The rotation axis of the oscillator is parallel to the drill stem, the drill stem being driven elastically, preferably at a frequency such as to set up standing waves therein, whereby circumferentially successive lengthwise oriented regions around the periphery of the column cyclically elongate and contract longitudinally in rotary progression. This longidudinal vibratory energy is transferred to the drill bit causing nutation thereof such that successive portions of the bit drive into the work material in a progression of longitudinal impulses as the stem undergoes circumferentially successive longitudinal cyclic motion in response to the vibratory energy applied thereto. This motion is limited by a jacket which surrounds the stem, thus effectively limiting the cyclic stress of this stem and isolating the vibrations thereof from the supporting structure of the assembly.
REFERENCES:
patent: 2743083 (1956-04-01), Zublin
patent: 2903242 (1959-09-01), Bodine
patent: 3096833 (1963-07-01), Bodine
patent: 3603407 (1971-09-01), Clark
patent: 3746310 (1973-07-01), Fransson et al.
Pate III William F.
Sokolski Edward A.
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