Percussive tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01) E21B 1/38 (2006.01) E21B 21/10 (2006.01) F15B 21/06 (2006.01) F15B 21/12 (2006.01)

Patent

CA 2312341

A percussion drill (10) has a tubular fluid transmitting body (14), with a drill bit (16) mounted on a drill bit support (20) itself mounted in body (14) via a spring (22) and splines (24). A mass (28) is spring mounted in the body (14) and is movable to impact on a face (26) of the support (20). Mounted to the mass (28) is a rotating valve (32) comprising two valve plates (34, 36). Each plate (34, 36) defines a slot (38, 40), such that rotation of one of the valve plates (36) relative to the other moves the slots (38, 40) into and out of alignment; the change in alignment of the slots (38, 40) alters the flow of drilling fluid through the valve (32), so altering the drilling fluid pressure force acting on the mass (28), so causing mass (28) to push against the spring (30), and impact on the drill bit support (20) providing a percussive action at the drill bit (16).

Marteau perforateur à percussion (10) possédant un corps tubulaire (14) transmettant un liquide, un trépan (16) étant monté sur un support (20) lui-même monté dans le corps (14) par l'intermédiaire d'un ressort (22) et de cannelures (24). Une masse (28) est montée élastique dans le corps (14) et est mobile, de façon à exercer un impact sur une face (26) du support (20). Une soupape rotative (32) est montée sur la masse (28) et est composée de deux plaques (34, 36). Chaque plaque (34, 36) définit une fente (38, 40), de sorte que la rotation d'une de ces plaques (36) par rapport à l'autre déplace les fentes (38, 40) afin de les aligner ou de les désaligner. La modification de l'alignement des fentes (38, 40) entraîne la variation de l'écoulement de liquide de perforation à travers la soupape (32) et, de ce fait, celle de la force de la pression du liquide de perforation sur la masse (28), ce qui provoque la poussée de la masse (28) contre le ressort (30) et son impact sur le support (20) du trépan et exerce, par conséquent, une action de percussion au niveau du trépan (16).

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