Bolt centralizer
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United States of America Patent
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Jul 29, 2003
Grant Date -
N/A
app pub date -
Apr 30, 2002
filing date -
Apr 30, 2002
priority date (Note) -
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Abstract
A bolt centralizer for a rock bolter, which advances a bolt along a work axis, has a hand pivotably mounted on an arm so as to pivot between first and second hand positions. A pair of fingers is pivotably attached to the hand. When the fingers are in a closed position, they form a centralizer passage which is aligned with the work axis when the hand is in the first hand position. The hand is pivoted to the second hand position to remove the fingers from the bolt to allow a bolt plate and bolt driver to be advanced past the hand.
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