Ring holder

Claim 1

MEANS FOR HOLDING A RING IN A RING RAIL HAVING TWO OPPOSITELY-FACING OUTER SURFACES AND MEANS DEFINING A RINGHOLDER-RECEIVING APERTURE, SAID APERTURE-DEFINING MEANS FORMING JUNCTURES WITH SAID SURFACES, COMPRISING AN INTEGRAL ANNULAR MEMBER FORMED ABOUT AN AXIS AND OF A RESILIENT NONMETALLIC MATERIAL AND HAVING (A) A SPLIT FORMED THEREIN, (B) A GROOVE IN ITS INNER PERIPHERY FOR TIGHTLY ENGAGING A FLANGE ON A RING TO BE HELD IN SAID RING RAIL, (C) A RAIL SEAT ON ITS OUTER PERIPHERY FOR TIGHTLY ENGAGING ONE OF SAID TWO SURFACES OF SAID RING RAIL, (D) A RELIEF GROOVE IN ITS OUTER PERIPHERY ADJACENT TO SAID RAIL SEAT, LYING WITHIN SAID APERTURE IN SAID RING RAIL, AND SPACED APART FROM SAID APERTURE-DEFINING MEANS, (E) A GENERALLY FRUSTO-CONICAL SURFACE ON ITS OUTER PERIPHERY ADJACENT TO SAID RELIEF GROOVE ON THE SIDE THEREOF OPPOSITE SAID RAIL SEAT, SAID FRUSTOCONICAL SURFACE (I) TAPERING AWAY FROM SAID AXIS AND FROM SAID ONE OF SAID TWO SURFACES OF SAID RING RAIL FOR TIGHTLY ENGAGING SAID RING RAIL AT THE JUNCTION OF THE SECOND OF SAID TWO SURFACES OF SAID RING RAIL WITH SAID APERTURE-DEFINING MEANS AND (II) TERMINATING BEYOND SAID SECOND SURFACE OF SAID RING RAIL IN A RIB HAVING A GREATER DIAMETER THAN THAT OF SAID APERTURE, AND (F) A GENERALLY FRUSTO-CONICAL SURFACE ON ITS OUTER PERIPHERY TAPERING FROM SAID RIB TOWARDS SAID AXIS AND AWAY FROM SAID TWO SURFACES AND TERMINATING IN AN EDGE HAVING A DIAMETER LESS THAN THAT OF SAID APERTURE.