Arrangement in rock drill and method of controlling rock drilling
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United States of America Patent
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Aug 14, 2001
Grant Date -
N/A
app pub date -
May 19, 2000
filing date -
Mar 21, 1997
priority date (Note) -
Expired
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Abstract
An arrangement in a rock drill comprising a shank and a percussion piston and lifting sleeve for moving the shank towards percussion piston, and a method of controlling rock drilling. The arrangement comprises a lifting sleeve around the shank and a plurality of cylindrical lifting pistons around the shank. In the method, upon downward drilling, the magnitude of the feed force of the rock drill is decreased as the number of extension rods increases, and a force is set to act on some lifting pistons to move the shank towards the percussion point.
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