Hydraulic impact tool
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United States of America Patent
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-
Apr 13, 1999
Grant Date -
N/A
app pub date -
Jan 8, 1997
filing date -
Jan 8, 1997
priority date (Note) -
Expired
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Abstract
A hydraulically driven hammer has a piston which contains metal piston rings on a constant diameter section. The housing has a plurality of axially spaced apart radial ports that extend through the housing into the bore. A valve supplies fluid to the ports to control reciprocation of the piston.
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