Magnetic key holder

Claim 1

A KEY HOLDER COMPRISING TWO INTERFITTING ELEMENTS, ONE OF SAID ELEMENTS COMPRISING A SHALLOW STEEL CUP HAVING A BOTTOM, A RIM, A CENTRAL AXIS SUBSTANTIALLY PERPENDICULAR TO SAID BOTTOM AND A DISK-SHAPED PERMANENT MAGNET SECURED IN SAID CUP, THE OTHER OF SAID ELEMENTS COMPRISING A STEEL COVER FOR SAID CUP CONSTITUTING AN ARMATURE FOR SAID MAGNET, TWO KEY-HOLDING MEANS, MEANS FOR ATTACHING ONE OF SAID KEY-HOLDING MEANS TO THE PERIPHERY OF SAID CUP, MEANS FOR ATTACHING THE OTHER OF SAID KEYHOLDING MEANS TO THE PERIPHERY OF SAID COVER, THE POINTS OF ATTACHMENT BEING NORMALLY OPPOSITE ONE ANOTHER ON A LINE APPROXIMATELY NORMAL TO SAID AXIS, THE RIM OF SAID CUP HAVING A HEIGHT AT A POINT OPPOSITE SAID POINT OF ATTACHMENT GREATER THAN THE THICKNESS OF SAID MAGNET AND SLOPING DOWNWARDLY TO APPROXIMATELY ZERO HEIGHT ADJACENT SAID POINT OF ATTACHMENT, AND SAID COVER HAVING A RIM PORTION COMPLEMENTAL TO THE RIM OF SAID CUP WHEN THE COVER AND CUP ARE IN ASSEMBLED POSITION, WHEREBY THE PORTION OF THE RIM OF SAID COVER OPPOSITE SAID POINT OF ATTACHMENT IS ENGAGEABLE WITH THE PERIPHERY OF SAID MAGNET TO PROVIDE A MECHANICAL INTERLOCK RESISTING SEPARATION OF SID CUP AND COVER BY A PULL IN OPPOSITE DIRECTION ON SAID ATTACHING MEANS.