Sonic drill

B - Operations – Transporting – 25 – D

Patent

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Details

B25D 9/02 (2006.01) B25D 9/04 (2006.01) E21B 1/24 (2006.01) E21B 1/26 (2006.01) E21B 1/30 (2006.01) E21B 7/24 (2006.01)

Patent

CA 2493039

A sonic drilling apparatus having a work piston within a cylinder chamber to provide a vibratory force through the alternate application of fluid under pressure into the bore above and below the piston in a manner that the piston will be forced to reciprocate within the bore. The cylinder chamber includes an inlet gallery to allow fluid under pressure to pass into the bore above a first face of the work piston and an exhaust gallery to allow fluid to escape from the bore below the second face of the work piston. A relief bypass is provided to prevent excessive build up of pressure in the bore during the reciprocating movement of the work piston.

L'invention concerne un appareil de forage ultrasonore à piston de travail établi dans une enveloppe de cylindre. Le piston se déplace en va-et-vient dans sa chemise pour fournir une force de vibration, par l'application alternée de fluide pressurisé dans la chemise, au-dessus et au-dessous du piston, contraignant celui-ci au mouvement de va-et-vient à l'intérieur de la chemise. L'enveloppe du cylindre comprend une galerie d'admission permettant au fluide pressurisé d'entrer dans la chemise au-dessus d'une première face du piston, et une galerie d'évacuation permettant au fluide de s'échapper de la chemise au-dessous de la seconde face du piston. Une dérivation de décharge est prévue pour éviter l'accumulation excessive de pression dans la chemise durant le mouvement de va-et-vient du piston.

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