Device in core barrels
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United States of America Patent
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-
Jun 5, 1984
Grant Date -
N/A
app pub date -
Oct 5, 1981
filing date -
Oct 10, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device in core drilling for indicating when a core barrel placed in a rotatable hollow drill rod is no longer capable of receiving a further quantity of reamed-out core material includes a valve which at said condition of the barrel constricts the passage for flushing medium flowing between the core barrel and the bore of the drill rod so that a readable flushing medium pressure increase occurs. The valve closes off said passage incompletely to allow a minor quantity of flushing medium to be taken to the drill bit mounted at the bottom of the drill rod, thereby to prevent said drill bit from being burnt out.
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