Releasable safety coupling pin

Claim 1

A COUPLING SECURING PIN, COMPRISING: AN ELONGATED BODY MEMBER HAVING ONE END THEREOF REMOVABLY INSERTABLE IN AN APERTURED ELEMENT OF A COUPLING; SAID BODY MEMBER HAVING AN ENLARGED HEAD AT THE END THEREOF OPPOSITE THE SAID ONE END AND FASHIONED WITH A RADIALLY EXTENDING SURFACE SPACED INWARDLY FROM AN OUTER END OF SAID HEAD, AND AN ABUTMENT-FORMING PROJECTION SPACED FROM SAID HEAD ALONG THE LONGITUDINAL AXIS OF SAID BODY MEMBER AND PROVIDING A RADIALLY EXTENDING SURFACE THEREON FACING THE RADIALLY EXTENDING SURFACE OF SAID HEAD; A SPLIT, COILED RESILIENT AND GENERALLY SPIRAL-SHAPED RING MOUNTED FOR SWINGING MOVEMENT ON THE BODY, AND HAVING OPPOSITE ENDS THEREOF ATTACHED TO THE BODY, ONE BEING ATTACHED PROXIMATE ONE OF SAID RADIALLY EXTENDING SURFACES AND THE OTHER END BEING ATTACHED PROXIMATE THE OTHER OF SAID RADIALLY EXTENDING SURFACES, AND HAVING SAID RING TENSIONED FOR SWINGING INTO ENCIRCLING RELATION TO THE ELEMENT IN THE COUPLING INTO WHICH SAID BODY MEMBER IS REMOVABLY INSERTABLE FOR ANCHORING SAID BODY MEMBER THEREIN; SAID RING BEING FASHIONED WITH A LOOP AT EACH END THEREOF AND HAVING SAID LOOPS WRAPPED AROUND THE BODY AND DISPOSED IN AXIALLY ABUTTING RELATION ONE EACH WITH A RESPECTIVE ONE OF SAID RADIALLY EXTENDING SURFACES; SAID RING HAVING THE LOOPS THEREOF ARRANGED FOR SLIDABLE MOVEMENT RELATIVE TO ONE ANOTHER ALONG THE LONGITUDINAL AXIS OF THE BODY TO PERMIT DEFLECTION OF THE RING IN ORDER TO PERMIT PASSING THE RING PAST THE SAID ONE END OF THE BODY MEMBER WHILE CONCURRENTLY THEREWITH ENCIRCLING THE APERTURED ELEMENT OF THE COUPLING.