Percussion device

Details Percussion device Percussion device

B - Operations, Transporting

25

D

B25D 9/14 (2006.01)

Patent

CA 2579149

Percussion device including a machine housing (1), a forwards and backwards movable percussion piston (2) in the machine housing, and a reciprocatingly movable tubular valve body (6) inside the machine housing, said percussion piston (2) being arranged to subject a tool (3) to impact, and said percussion piston including a first (4) and a second (5) driving surface arranged to be pressurized in order to drive the percussion piston forwards and backwards, said valve body (6) including a first end surface (12) and a second end surface (13), wherein pressurizing the first end surface (12) tends to drive the valve body in a first direction and pressurizing the second end surface (13) tends to drive the valve body in a second direction, whereby the valve body (6) is arranged, over a channel (7) arranged in the machine housing, to connect at least the second (5) of the driving surfaces alternately to a pressure source (8) or to low pressure (9), wherein an inner room (31) in the tubular valve body (6) is continuously connected to the low pressure (9) over at least one-opening (32) through an envelope surface of the valve body (6).

L'invention concerne un dispositif de percussion comprenant une enceinte de machine (1), un piston de percussion mobile en avant et en arrière (2) dans l'enceinte, et un corps de valve tubulaire mobile en va-et-vient (6) à l'intérieur de l'enceinte, ledit piston (2) soumettant un outil (3) à l'impact, et comprenant des première (4) et seconde (5) surfaces d'entraînement soumises à pression pour le mouvement de percussion avant-arrière du piston, et ce corps de valve (6) comprenant une première surface terminale (12) et une seconde surface terminale (13), sachant que la pression exercée sur cette première surface (12) tend à entraîner le corps de valve dans une première direction et que la pression exercée sur cette seconde surface (13) tend à entraîner le corps de valve dans une seconde direction, ledit corps (6), situé au-dessus d'un canal (7) placé dans l'enceinte, connectant au moins la seconde (5) surface d'entraînement alternativement à une source de pression (8) ou à une faible pression (9), et un espace interne (31) dans le corps de valve tubulaire (6) est relié continuellement à la basse pression (9) via au moins une ouverture (32) à travers une surface d'enveloppe du corps de valve (6).

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