Retractable fountain pen

Claim 1

A FOUNTAIN PEN, COMPRISING A CYLINDRICAL BARREL, A TUBULAR BODY AXIALLY DISPOSED IN THE BARREL AND SLIDABLE THEREIN, SAID BODY HAVING A LATERAL HOLE NEAR ONE END THEREOF, A CYLINDRICAL CARTRIDGE CONTAINING INK AXIALLY DISPOSED IN SAID BODY, SAID CARTRIDGE HAVING A FRANGIBLE END WALL, A PEN POINT AND INK FEEDING STEM INSERTED IN SAID ONE END OF SAID BODY AND SLIDABLE THEREWITH TO EXTEND OUT OF ONE END OF THE BARREL AND TO RETRACT WITHIN SAID ONE END OF THE BARREL IN TWO DIFFERENT POSITIONS OF SAID BODY IN THE BARREL, A ROD-LIKE MEMBER COAXIAL WITH SAID BODY AND MOVABLE TO PROJECT ONE END THEREOF OUT OF THE OTHER END OF THE BARREL IN ONE POSITION OF THE BODY WHILE THE PEN POINT IS RETRACTED INSIDE THE BARREL, A COIL SPRING IN THE BARREL COAXIAL WITH SAID BODY AND BEARING ON SAID ONE END THEREOF, SAID SPRING BIASING SAID BODY TO SAID ONE POSITION THEREOF RETRACTING THE PEN POINT AND EXTENDING THE ROD-LIKE MEMBER, AN ELONGATED SPRING CLIP SECURED AT ONE END THEREOF NEAR SAID ONE END OF THE BARREL, SAID CLIP HAVING A CATCH PIN NEAR SAID ONE END THEREOF ENGAGEABLE IN THE HOLE IN SAID BODY FOR HOLDING THE BODY IN THE OTHER OF SAID TWO POSITIONS WITH THE PEN POINT EXTENDED FROM THE BARREL AND WITH SAID ONE END OF THE ROD-LIKE MEMBER RETRACTED INTO THE BARREL, SAID BARREL HAVING AN ANNULAR FLANGE NEAR THE OTHER END THEREOF PROVIDING A SEAT FOR SAID SPRING, SAID BARREL HAVING AN EXTERNAL, LATERAL, LONGITUDINALLY EXTENDING RECESS, SAID CLIP HAVING A FREE OTHER END DISPOSED IN SAID RECESS SO THAT THE CLIP LIES FLUSH WITH THE EXTERIOR OF THE BARREL WHEN THE PEN POINT IS EXTENDED IN WRITING POSITION, SAID FREE OTHER END OF THE CLIP EXTENDING TOWARD THE OTHER END OF THE BARREL, A PRONG CARRIED BY SAID BODY INTERIORLY THEREOF AND PIERCING THE FRANGIBLE END WALL OF THE CARTRIDGE TO FORM AN OPENING THEREIN, SAID STEM HAVING AN INK FEEDING GROOVE COMMUNICATING WITH THE OPENING IN THE END WALL OF THE CARTRIDGE, AND A CAP DETACHABLY SECURED TO THE OTHER END OF SAID BODY APPLYING PRESSURE AXIALLY TO THE CARTRIDGE TO FORCE SAID END WALL AGAINST SAID PRONG AND MAINTAIN SAID OPENING IN COMMUNICATION WITH SAID GROOVE, SAID ROD-LIKE MEMBER BEING INTEGRAL WITH SAID CAP AND EXTENDING AXIALLY THEREFROM, WHEREBY LIFTING THE FREE END OF THE SPRING CLIP OUT OF SAID RECESS REMOVES THE CATCH PIN FROM SAID HOLE WHILE THE BODY SLIDES AXIALLY AND RETRACTS THE PEN POINT, SAID CATCH PIN THEN BEARING ON THE BODY AND HOLDING THE FREE END OF THE SPRING CLIP EXTENDED LATERALLY OUTWARDLY OF THE BODY AND TOWARD THE OTHER END OF THE BARREL TO SERVE AS A HOOK-LIKE SUPPORT FOR THE PEN.