Percussion device with a control valve for two alternately striking pistons
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United States of America Patent
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Dec 16, 2008
Grant Date -
Dec 16, 2004
app pub date -
May 7, 2004
filing date -
Nov 7, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a percussion device comprising two percussion pistons alternately making a percussion motion and a control valve for controlling the percussion pistons. The control valve (7) comprises a slide (8) affected by a force so that the slide is generally in a first position, but moves at the end of the percussion motion of the first percussion piston from the first position to a second position and correspondingly back to the first position at the end of the percussion motion of the second percussion piston (4).
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