Sonic drill head

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E - Fixed Constructions

21

B

E21B 7/24 (2006.01)

Patent

CA 2740432

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.

Un ensemble tête de forage comprend une tige comportant un axe de tige, un ensemble oscillateur fonctionnellement associé à la tige, lensemble oscillateur comportant au moins un rotor lesté de façon excentrée conçu pour tourner autour dun point de pivotement afin de générer une force de vibration oscillante, une ligne centrale doscillation étant définie transversalement à laxe de tige et comprenant le point de pivotement. Lensemble tête de forage comprend également un support inférieur accouplé à la tige sur un premier côté de la ligne centrale doscillation et un support supérieur accouplé à la tige sur un second côté de la ligne centrale doscillation, le second côté étant opposé au premier côté.

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