Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device
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United States of America Patent
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Dec 6, 2011
Grant Date -
Dec 31, 2009
app pub date -
Sep 12, 2007
filing date -
Sep 13, 2006
priority date (Note) -
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Abstract
A percussive device and method having, inside a machine housing (3), a reciprocally moveable percussive piston (2), the movement of which is controlled by a control valve (5), which is arranged to alternatively connect a chamber to a pressure source and to low pressure in dependence on a signal corresponding to the axial position of the percussive piston, and a valve (16) arranged to allow adjustment of the axial position of the percussive piston at which the signal is transmitted, by opening and blocking of a connection between one or more control channels (10, 11, 12, 13) and the control valve.
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