Earth borehole drilling and testing tool

Claim 1

IN AN EARTH FORMATION DRILLING AND TESTING TOOL, APPARATUS COMPRISING: A TUBULAR DRILL STEM INCLUDING A DRILL BIT AT THE LOWER END THEREOF; A SLIP JOINT MEANS LOCATED IN SAID DRILL STEM ADJACENT AND DRILL BIT, SAID SLIP JOINT MEANS INCLUDING; A PAIR OF CONCENTRIC, LONGITUDINALLY TELESCOPICALLY SLIDABLE COUPLING ELEMENTS, ONE OF SUCH COUPLING ELEMENTS BEING FIXEDLY CONNECTED TO THE DRILL STEM PORTION THEREABOVE AND THE OTHER OF SAID COUPLING ELEMENTS BEING FIXEDLY CONNECTED TO SAID DRILL STEM PORTION THEREBELOW; MEANS INTERLOCKING SAID COUPLING ELEMENTS PERMITTING LIMITED LONGITUDINAL SHORTENING AND LENGTHENING TELESCOPIC SLIDING MOVEMENT BUT AT ALL POSITIONS RELATIVE TO ONE ANOTHER PREVENTING CONTINUOUS ROTATION OF SAID COUPLING ELEMENTS, RELATIVE TO ONE ANOTHER; A TUBULAR MANDREL HAVING A PACKING SUPPORTING PORTION OF UNIFORM OUTSIDE DIAMETER FIXED TO ONE OF SAID COUPLING ELEMENTS AND SLIDABLE LONGITUDINALLY RELATIVE TO THE OTHER OF SAID COUPLING ELEMENTS; A FIRST CONCENTRIC ANNULAR SHOULDER CARRIED BY ONE OF SAID COUPLING ELEMENTS ADJACENT ONE END PORTION OF SAID MANDREL; A SECOND CONCENTRIC ANNULAR SHOULDER CARRIED BY THE OTHER OF SAID COUPLING ELEMENTS ADJACENT THE OTHER END PORTION OF SAID MANDREL AND SPACED APART AXIALLY FROM SAID FIRST ANNULAR SHOULDER, SAID SHOULDERS BEING THEREBY MOVABLE LONGITUDINALLY TOWARD AND WAY FROM ONE ANOTHER ALONG SAID PACKING SUPPORTING PORTION OF SAID MANDREL BY SUCH RELATIVE LONGITUDINAL TELESCOPIC SHORTENING AND LENGTHENING MOVEMENT, RESPECTIVELY, OF SAID COUPLING ELEMENTS; AND AN ELONGATED PACKING SLEEVE ON SAID PACKING SUPPORTING PORTION OF SAID MANDREL INTERMEDIATE SAID SHOULDERS, SAID PACKING SLEEVE BEING ADAPTED TO BE COMPRESSED AXIALLY BETWEEN SAID SHOULDERS AND THEREBY EXPANDED RADIALLY INTO SEALING ENGAGEMENT WITH A SURROUNDING BOREHOLE WALL UPON SUCH SHORTENING MOVEMENT OF SAID COUPLING ELEMENTS.