Electromagnet assembly with interfitting parts

Claim 1

IN AN ELONGATED THE COMBINATION COMPRISING: A BASE FRAME HAVING A PAIR OF FORWARDLY PROJECTING ARMS EXTENDING THEREFROM THAT ARE LATERALLY SPACED WITH RESPECT TO ONE ANOTHER TO PRESENT FACING INNER SURFACES, SAID ARMS BEING PROVIDED WITH KEYWAY SLOTS THAT OPEN ALONG SAID FACING INNER SURFACES AND AT THE OUTER ENDS OF THE ARMS AND WHICH HAVE DIVERGENT SURFACES; SAID FRAME ALSO INCLUDING A YOKE SOCKET THAT IS BETWEEN SAID ARMS AND IS OF AN IRREGULAR CONFIGURATION; A MAGNETIC YOKE HAVING AN AFTER END RECEIVED IN AND MATCHING THE CONFIGURATION OF SAID YOKE SOCKET AND A KEYPIECE SLOT EXTENDING THERETHROUGH, SAID KEYPIECE SLOT HAVING DIVERGENT SURFACES MATCHING THOSE OF SAID KEYWAY SLOTS AND ALIGNED WITH SAID KEYWAY SLOTS WHEN SAID YOKE IS RECEIVED IN SAID YOKE SOCKET; A KEYPIECE EXTENDING THROUGH THE KEYPIECE SLOT AND OUTWARDLY ON EITHER SIDE OF THE YOKE TO BE RECEIVED IN SAID KEYWAY SLOTS, SAID KEYPIECE HAVING DIVERGENT SURFACES MATCHING SAID KEYWAY AND KEYPIECE SLOTS; AN OPERATING COIL MOUNTED ON SAID FRAME; AND A MAGNETIC ARMATURE IN FACING RELATION TO SAID YOKE FOR OPERATION THEREWITH IN RESPONSE TO SAID COIL.