Drill steel drive unit
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United States of America Patent
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-
May 30, 1989
Grant Date -
N/A
app pub date -
Apr 6, 1987
filing date -
Apr 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A chuck to be power driven for rotating drill bits in the mining and construction fields. The chuck is designed to drive one or more telescoped drill steels which carry a mining bit and is designed to drive drill steels with square drive ends, large hexagonal drive ends, small hexagonal drive ends and large and small hexagonal ends as well as roof bolt units without modification.
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