Electromagnetic switching relay having a three piece u-shaped core

Claim 1

IN AN ELECTROMAGNETIC DEVICE, A FRAME COMPRISING SPACED UPPER AND LOWER PLATES, A PLURALITY OF SPACED UPSTANDING LEGS SECURED TO THE PLATES AND PROJECTING BELOW THE LOWER PLATE, A PAIR OF UPSTANDING MAGNETIZING COILS POSITIONED WITHIN THE CONFINES OF THE PLATES AND THE LETS, A CORE ASSEMBLY COMPRISING A FIRST MEMBER SECURED TO THE FRAME AND INCLUDING A WEB DISPOSED ABOVE THE COILS AND A PAIR OF SPACED ARMS DEPENDING FROM THE WEB, EACH ARM EXTENDING THROUGH A CORRESPONDING COIL, AND A PAIR OF SECOND MEMBERS, EACH SECOND MEMBER INCLUDING A PORTION WHICH EXTENDS THROUGH A CORRESPONDING COIL AND A PORTION WHICH IS WIDER THAN THE FIRST-MENTIONED PORTION AND WHICH IS DISPOSED BENEATH THE LOWER PLATE AND SERVES AS A POLE PIECE, EACH SECOND MEMBER BEARING AGAINST AND BEING SECURED TO A CORRESPONDING ARM OF THE FIRST MEMBER, AN ARMATURE UNIT POSITIONED BELOW AND SECURED TO THE LOWER PLATE COMPRISING AN ARMATURE THAT IS PIVOTAL RELATIVE TO THE FRAME AND THAT INCLUDES A PAIR OF SPACED PARTS EACH OF WHICH IS COOPRATIVELY ASSOCIATED WITH A CORRESPONDING POLE PIECE, BIASING MEANS NORMALLY URGING THE ARMATURE IN ONE DIRECTION OF ROTATION RELATIVE TO THE FRAME AND MAINTAINING SAID ARMATURE PARTS IN A POSITION AWAY FROM THE POLE PIECES, THE ARMATURE BEING ADAPTED, UPON ENERGIZATION OF THE COIL, TO BE MOVED IN A REVERSE DIRECTION AGAINST THE ACTION OF THE BIASING MEANS BY MAGNETIC ATTRACTION BETGWEEN THE POLE PIECES AND SAID ARMATURE PARTS, AND A PLURALITY OF SPACED RESILIENT FINGERS CARRIED BY AND PROFECTING GENERALLY OUTWARDLY OF THE FRAME, SAID FINGERS BEING ADAPTED TO EFFECT FRICTIONAL ENGAGEMENT WITH THE INNER SURFACE OF THE INSIDE WALL OF A COVER UNIT THAT IS ADAPTED TO ENCASE PARTS OF THE DEVICE.