Impact tool

B - Operations – Transporting – 25 – D

Patent

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Details

B25D 9/12 (2006.01)

Patent

CA 2548404

An impact tool (20) has a slidable hammer (82) that is driven by hydraulic oil under pressure inside a chamber (26,89). The hydraulic oil is pressurized by a piston (110,280) driven by compressed gas on the opposite side of the piston (110,282) from the hydraulic oil. The gas in the gas chamber (62,72,251A,294) is compressed by the piston (110,282) on an initial stroke, and has a large annular chamber (62,294) holding the gas so that higher average gas pressure can be attained during a power stroke of the piston (110,282). As the piston (110,282) is moved to compress the gas, the piston lifts a valve (116,256) that opens a passage (134,135,136,262,264,265) for the hydraulic oil moved by the piston (110,280) to act on a hammer (82) to impact a breaking tool (98). The piston (110,280) is a two part (112,114,284,290) piston that serves to lower the inertia during the final closing of the valve (116,256), and thereby reduces impact loads on the valve (116,256) as it is closed. The valve (116,256) also is controlled as to its stroke for efficient operation.

L'invention concerne un outil d'impact (20) ayant un marteau coulissant (82) qui est entraîné par une huile hydraulique sous pression contenue dans une chambre (26,89). L'huile hydraulique est mise sous pression par un piston (110,280) entraîné par du gaz comprimé sur le côté opposé du piston (110,282) de l'huile hydraulique. Le gaz de la chambre à gaz (62,72,251A,294) est comprimé par le piston (110,282) lors d'une course initiale. Une grande chambre annulaire (62,294) contient le gaz de telle manière que l'on puisse obtenir une pression moyenne du gaz plus élevée pendant une course puissante du piston (110,282). Lorsque le piston (110,282) se déplace pour comprimer le gaz, le piston lève la valve (116,256) qui ouvre un passage (134,135,136,262,264,265) destiné à l'huile hydraulique qui est déplacée par le piston (110,280) pour agir sur un marteau (82) et l'amener à frapper un outil de rupture (98). Le piston (110,280) est un piston à deux éléments (112,114,284,290) qui permet de réduire l'inertie pendant la fermeture finale de la valve (116,256), et ainsi de réduire les charges d'impact sur la valve (116,256) lorsqu'elle est fermée. La valve (116,256) est également commandée ainsi que sa course aux fins d'un fonctionnement efficace.

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