Arrangement for employing drill steel centralizer travelling on feed beam of rock drill machine
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United States of America Patent
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Sep 4, 2012
Grant Date -
Jun 10, 2010
app pub date -
May 15, 2008
filing date -
May 18, 2007
priority date (Note) -
Expired
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Abstract
The invention relates to an arrangement for employing a drill steel centralizer travelling on a feed beam of a rock drill machine. The drill steel centralizer has a pressure fluid-operated actuator for closing a transfer opening intended for a drill rod during drilling, whereby pressure fluid is fed into the actuator during drilling.
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