Releasable retention structure for scabbard-knife combination

Claim 1

IN A KNIFE: SAID KNIFE HAVING A BLADE PROVIDED WITH AN EXTENSION TERMINATING IN AN EXTERNALLY THREADED STUD, A KNOB SURROUNDING THE STUD, AND A SHANK SURROUNDING THE EXTENSION BETWEEN THE BLADE AND THE KNOB, PRESENTING A HANDLE, SAID KNOB HAVING AN OUTER FACE, A PERFORATED PARTITION SPACED INWARDLY FROM SAID FACE, AND A BORE BETWEEN THE FACE AND THE PARTITION, SAID STUD EXTENDING THROUGH THE PARTITION, A FASTENER HAVING AN INTERNALLY TAPPED BOSS SCREWTHREADED ON THE STUD WITHIN THE BORE IN ENGAGEMENT WITH THE PARTITION FOR HOLDING THE SHANK ON THE EXTENSION AND THE KNOB ON THE STUD, WITH THE SHANK AND THE KNOB CLAMPED TIGHTLY BETWEEN THE BLADE AND THE BOSS, THE BORE AND THE BOSS HAVING SMOOTH, COMPLEMENTAL, CYLINDRICAL SURFACES, RENDERING THE BOSS FREELY ROTATABLE IN THE BORE; AND AN ELEMENT ON THE FASTENER DISPOSED OUTWARDLY FROM THE BOSS FOR LOCKING THE FASTENER TO THE KNOB, THE BOSS BEING BETWEEN THE EXTENSION AND THE ELEMENT, SAID ELEMENT HAVING A POLYGONAL PERIPHERY, PRESENTING A NUMBER OF TOOL-RECEIVING FLATS FOR ROTATING THE BOSS, SAID ELEMENT BEING EMBEDDED WITHIN THE KNOB FLUSH WITH SAID FACE.