Syringe for chromatographic analyses

Claim 1

A SYRINGE, COMPRISING: (A) A TUBULAR BARREL ASSEMBLY INCLUDING (1) A TUBULAR BARREL HAVING (A) A WALL AT ONE END WITH AN AXIAL BORE THERETHROUGH, SAID BARREL BEING OPEN AT THE OPPOSITE END WHICH TERMINATES IN (B) A THIMBLE WITH A FRUSTO-CONICAL FREE END PORTION HAVING ANNULARLY SPACED SCALE MARKINGS THEREON, THERE BEING AN INTERNALLY THREADED PORTION ADJACENT SAID WALL, (C) AN EXTERNALLY THREADED ANNULAR ENLARGEMENT ADJACENT SAID FREE END, THERE BEING A PLURALITY OF LONGITUDINALLY EXTENDING, ANNULARLY SPACED SLOTS THROUGH THE ENLARGEMENT AND A PORTION OF THE BARREL REARWARDLY OF SAID ENLARGEMENT TO THEREBY PROVIDE A PLURALITY OF RESILIENT CLAMPING ELEMENTS; (D) A CLAMPING WEDGE FOR EACH CLAMPING ELEMENT, SAID CLAMPING WEDGES HAVING THEIR OUTER SURFACES EXTENDING OUTWARDLY AND REARWARDLY FROM A LOCATION ADJACENT THE ENLARGEMENT; (E) AN INTERNALLY THREADED LOCKING RING THREADEDABLY DISPOSED ON SAID ENLARGEMENT AND ADAPTED TO BE SCREWED TOWARD SAID WEDGES TO THEREBY ENGAGE THE INCLINED SURFACES THEREOF AND FORCE SAME INWARDLY AND THEREBY CORRESPONDING MOVE SAID CLAMPING ELEMENTS, SAID LOCKING RING BEING ADAPTED TO BE SCREWED FORWARDLY TO A WEDGE DISENGAGED POSITION; (2) AN INNER SLEEVE HAVING ITS INNER END PROVIDED WITH AN EXTERNALLY THREADED PORTION ENGAGEABLE WITH THE INTERIOR THREADS OF THE BARREL, SAID SLEEVE PROJECTING FORWARDLY OF THE FORWARD END OF SAID BARREL AND BEING ROTATABLE IN SAID BARREL TO EFFECT RELATIVE LONGITUDINAL MOVEMENT OF SAID SLEEVE AND BARREL, SAID INNER SLEEVE HAVING A GRADUATE SCALE WITHIN LONGITUDINALLY SPACED MARKS THEREON COOPERABLE WITH THE SCALE ON THE THIMBLE TO THEREBY PROVIDE A MICROMETER ARRANGEMENT FOR CALIBRATING THE SYRINGE AND DETERMINING THE VOLUME OF FLUID DISCHARGE THEREFROM; (B) A HOLLOW CYLINDER CONNECTED TO THE FORWARD END OF SAID INNER SLEEVE; (C) A PLUNGER ROD OPERABLY DISPOSED IN THE BORE OF SAID BARREL WALL, SAID BARREL, INNER SLEEVE, AND CYLINDER; (D) A PLUNGER OPERABLY DISPOSED WITHIN SAID CYLINDER, SAID PLUNGER BEING MOUNTED ON THE ADJACENT END OF SAID PLUNGE ROD; (E) YIELDING MEANS FOR RESILIENTLY URGING THE ROD IN A DIRECTION TO EFFECT DISCHARGE OF FLUID FROM SAID CYLINDER; (F) AND A LATCH FOR RELEASABLY HOLDING THE PLUNGER ROD TO MAINTAIN THE PLUNGER TEMPORARILY IN A RETRACTED POSITION.