Separable fastener

Claim 1

A SEPARABLE FASTENER FOR DETACHABLY SECURING TWO OBJECTS TOGETHER, EACH OBJECT HAVING A HOLE THERETHROUGH, SAID FASTENER COMPRISING: A RECEPTACLE, SAID RECEPTACLE INCLUDING A BASE PORTION ADAPTED TO BE ATTACHED TO A FIRST OF SAID OBJECTS, AND HAVING AN APERTURE THERETHROUGH HAVING AN AXIS, SPRINGING MEANS ATTACHED TO SAID RECEPTACLE INCLUDING A PAIR OF OPPOSITE ENGAGING ARMS ADAPTED TO ENTER THE APERTURE AND AT LEAST PARTIALLY OVERLIE THE HOLE IN THE OBJECT TO WHICH THE RECEPTACLE IS ATTACHED, AND ALSO TO AT LEAST PARTIALLY OVERLIE STRUCTURE OF THAT OBJECT SURROUNDING THAT HOLE, A PORTION OF EACH OF SAID ENGAGING ARMS LYING IN A PLANE WHERE IT IS AXIALLY BRACED BY STRUCTURE CONNECTED TO THE LAST-NAMED OBJECT; AND A PLUNGER ASSEMBLY, SAID PLUNGER ASSEMBLY INCLUDING A PLUNGER ADAPTED TO PASS THROUGH SAID HOLES, THE PLUNGER BEARING A PAIR OF SLANTED SURFACES LYING ON OPPOSITE SIDES OF A FIRST END OF SAID PLUNGER AND ADAPTED TO BE PRESSED BETWEEN AND PAST THE ENGAGING ARMS, THE PLUNGER ALSO BEARING A SLOT ON EACH SIDE OF SAID PLUNGER ANGULARLY ALIGNED WITH THE SLANTED SURFACES, A SHOULDER ON THE OTHER SIDE OF THE SLANTED SURFACES FROM SAID FIRST END AND BOUNDING ON SIDE OF THE SLOT, THE ENGAGING ARMS SNAPPING INTO THE SLOTS AND ENGAGING THE SHOULDERS TO LOCK THE FASTENER, THE PLUNGER BEARING A PAIR OF EXPELLER SURFACES ON OPPOSITE SIDES OF THE PLUNGER, A PORTION OF EACH OF WHICH IS AXIALLY EVEN WITH THE SLOTS, WHICH SLOTS ARE AXIALLY EVEN WITH EACH OTHER, SAID EXPELLER SURFACES TAPERING TOWARD EACH OTHER FROM THE SLOTS TO SAID FIRST END FOR EXPELLING THE PLUNGER FROM THE APERTURE WHEN THE PLUNGER IS TURNED SO THAT THE ENGAGING ARMS LEAVE SAID SLOTS AND ENGAGE THE EXPELLER SURFACES, AND MEANS FOR HOLDING THE PLUNGER TO THE SECOND OF SAID OBJECTS, THE SHOULDERS, ENGAGING ARMS, AND OBJECT STRUCTURE SERVING AS MUTUAL BUTTRESSING WHEN THE PLUNGER IS ENGAGED BY THE RECEPTACLE.