Boring or penetrating the earth – With below-ground tool drive prime mover – With positive connection between tool and support shaft for...
Patent
1975-11-06
1977-12-06
Purser, Ernest R.
Boring or penetrating the earth
With below-ground tool drive prime mover
With positive connection between tool and support shaft for...
175 17, 175323, 175394, 175325, 175422, E21B 106
Patent
active
040611973
ABSTRACT:
A drilling assembly which is particularly adapted for drilling in regions of the earth having permafrost, comprising a relativey large earth auger including at least one helical flight which is welded to a long central tube. The upper end of the auger has a shape such that torque may be readily applied to the auger for rotating the same. Interiorly of the upper end of the tube is a means for mounting a downhole percussion hammer, such that the percussion hammer may be suspended for operation within the tube. Preferably, a substantially solid drill bit having a generally frustoconical (pointed) shape is used in conjunction with the percussion hammer. Also, a means for advantageously providing for admitting more compressed air to the bottom of the hole than would normally be admissible by relying on air supplied to the percussion hammer alone.
In another embodiment, the helical flight adjacent to the periphery of the tube is replaced by arc-shaped segments that are axially spaced and off-set with respect to each other along the tube. Cuttings which are blown part of the way out of a hole being drilled will tend to accumulate on top of these segments; lifting the apparatus out of the hole will naturally remove the captured cuttings.
REFERENCES:
patent: 1343902 (1920-06-01), Chapman
patent: 2776123 (1957-01-01), Snyder
patent: 2999572 (1961-09-01), Hinckley
patent: 3219131 (1965-11-01), Boyd
patent: 3232361 (1966-02-01), Haspert
patent: 3241624 (1966-03-01), Rassieur
patent: 3463254 (1969-08-01), Miller
patent: 3885638 (1975-05-01), Skidmore
Favreau Richard E.
McHugh Charles W.
Purser Ernest R.
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