Wire line core barrel

Claim 1

IN CORE DRILLING APPARATUS THAT INCLUDES A DRILL STEM HAVING A HOLLOW BIT END LOCATED IN A HOLE DRILLED IN THE EARTH AND A LATCH SEAT AXIALLY SPACED FROM SAID BIT END, A CORE BARREL INNER TUBE ASSEMBLY COMPRISING MEANS FOR COLLECTING A CORE SAMPLE, A FITTING CONNECTED TO THE CORE SAMPLE MEANS TO EXTEND AXIALLY THEREFROM, DETENT MEANS MOUNTED BY SAID FITTING FOR MOVEMENT BETWEEN A POSITION LATCHINGLY ENGAGING SAID LATCH SEAT AND A RETRACTED POSITION, SAID DETENT MEANS INCLUDING A PAIR OF LATCHES PIVOTALLY MOUNTED ON SAID FITTING, LATCH RELEASE MEANS MOUNTED BY THE FITTING FOR LIMITED AXIAL SLIDABLE MOVEMENT BETWEEN A FIRST POSITION AND A SECOND POSITION MORE REMOTE FROM SAID CORE SAMPLE MEANS, SAID DETENT MEANS BEING POSITIONED TO MOVE TO A RETRACTED POSITION WHEN SAID RELEASE MEANS IS MOVED TO ITS SECOND POSITION, MEANS MOUNTED ON THE RELEASE MEANS FOR MOVEMENT THEREWITH TO IN THE RELEASE MEANS FIRST POSITION LOCK SAID DETENT MEANS IN A LATCH SEAT ENGAGING POSITION AND IN A RELEASE MEANS SECOND POSITION PERMIT THE DETENT MEANS BEING MOVED TO A RETRACTED POSITION, SAID LATCHES HAVING AXIALLY OUTER, ADJACENT CORNERS THAT HAVE OPPOSITELY FACED CUT OUTS OF A SIZE AND SHAPE TO HAVE THE LOCKING MEANS MOVE THEREINTO WHEN THE LATCHES ARE IN A LATCH SEAT ENGAGING POSITION TO RETAIN SAID LATCHES