Roof bolts for use in mines, a method for their production and method for their installation
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United States of America Patent
Stats
-
Jan 31, 2006
Grant Date -
Aug 11, 2005
app pub date -
Apr 6, 2005
filing date -
Sep 13, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A roof bolt comprises a shaft for insertion in a hole drilled in a mine roof and a head whereby the bolt may be rotated, the head being offset with respect to the longitudinal axis of the shaft so that when the bolt is rotated by means of its head the shaft is caused to describe a circle of greater diameter than its own diameter, and where the offset is at least 08 inch and not more than 0.25 inch. Preferably the offset is from 0.10 to 0.16 inch. The invention includes a method for the production of roof bolts which comprise a shaft for insertion in a hole drilled in a mine roof and a head whereby the bolt may be rotated, the method being characterised by being controlled so that at least 90% of the bolts produced have their head central axis offset with respect to the longitudinal axis of the shaft by an amount of at least about 0.08 inch and not more than about 0.25 inch.
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