Multi-color pressure adjustable writing instrument

Claim 1

IN A WRITING INSTRUMENT: A CASING HAVING A WRITING END, AN AXIALLY SLOTTED TUBULAR INSERT IN SAID CASING, A ROTATABLE FEED SPINDLE AXIALLY MOVABLE IN SAID INSERT FROM A RETRACTED POSITION DOWNWARDLY TOWARD THE WRITING END OF THE CASING INTO ADVANCED POSITION, SPRING MEANS URGING SAID SPINDLE TOWARD ITS RETRACTED POSITION, A PLURALITY OF CARRIES IN THE CASING RESPECTIVELY PROVIDED WITH TONGUES EXTENDING ALONG SAID INSERT AND ENDING IN HOOK-SHAPED PORTIONS EXTENDING INTO THE UPPER ENDS OF THE SLOTS IN THE INSERT, SAID SPINDLE BEING PROVIDED WITH RADIALLY EXTENDING MEANS HAVING A RECESS THEREIN LOCATED IN THE PLANE OF SAID HOOK-SHAPED PORTIONS WHEN THE SPINDLE IS RETRACTED AND MOVABLE BY ROTATION OF THE SPINDLE INTO PREDETERMINED ROTATED POSITIONS INTO SELECTIVE ENGAGEMENT WITH ANY ONE ONLY OF SAID HOOK-SHAPED PORTIONS, A SPRING URGED LOCKING MEMBER CARRIED BY SAID SPINDLE, AN ABUTMENT IN THE INSERT ENGAGEABLE BY SAID LOCKING MEMBER FOR LOCKING THE SPINDLE IN SAID ADVANCED POSITION, MEANS PROTRUDING FROM SAID CASING AND CONNECTED TO SAID SPINDLE FOR MOVING SAID SPINDLE INTO SAID ADVANCED POSITION AND FOR MOVING SAID SPINDLE BEYOND SAID ADVANCED POSITION, MEANS FREELY RECIPROCABLY MOUNTED IN SAID CASING AND FRICTIONALLY ENGAGING AND RETRACTING SAID LOCKING MEMBER WHEN THE SPINDLE IS ADVANCED BEYOND ITS ADVANCED POSITION THEREBY TO PERMIT SAID SPRING MEANS TO RETURN SAID PINDLE TO ITS RETRACTED POSITION, RETAINER RING MEANS ROTATABLY BUT AXIALLY NONDISPLACEABLY MOUNTED IN THE INSERT ENGAGING BENEATH SAID HOOK-SHAPED PORTIONS FOR RETAINING THEOSE CARRIES NOT ENGAGED BY SAID RECESS MEANS, AND ABUTMENT MEANS AT THE END