Sonic large bore earth auger

Details Sonic large bore earth auger Sonic large bore earth auger

1976-03-22

1978-02-14

Purser, Ernest R.

Boring or penetrating the earth

Natural vibration characteristic of an element of boring...

299 15, 175394, E21B 704

Patent

active

040733530

ABSTRACT:
Means are provided to rotatably drive a cutter blade device about a central point so as to bore a circular hole in the ground. Elastic bar means is vibrationally excited at a sonic frequency by means of an orbital mechanical oscillator, the frequency of the oscillator being adjusted to provide resonant standing wave vibration of the bar means. Vibrational energy is transferred from the bar means to the cutter device in unidirectional (rectified) pulses, the vibrational energy aiding the rotary torque action of the cutter device and causing the earthen material to be broken into small size cuttings. The vibrational energy is applied to the cutter device at a location thereon away from the rotational axis of the cutter device, therefore maximizing the availability of the sonic energy in the cutting action and providing a substantial lever arm at the central portions of the device.

REFERENCES:
patent: 3235311 (1966-02-01), Hagenbook
patent: 3291228 (1966-12-01), Bodine, Jr.
patent: 3367716 (1968-02-01), Bodine
patent: 3406768 (1968-10-01), Miller
patent: 3550698 (1970-12-01), Pauley
patent: 3633683 (1972-01-01), Shatto, Jr.
patent: 3633688 (1972-01-01), Bodine

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