Electromagnetic switching device

Claim 1

IN AN ELECTROMAGNETIC DEVICE, AN ELECTROMAGNET UNIT COMPRISING A FRAME, AN ELECTROMAGNET COIL CARRIED BY THE FRAME, A POLEPIECE EXTENDING THROUGH THE COIL AND AT LEAST ONE POLE AT ONE END OF THE POLEPIECE; AN ARMATURE UNIT COMPRISING AN ARMATURE ADJACENT THE POLE, AND ARMATURE ENGAGING THE FRAME AND HAVING A PAIR OF SPACED THROUGH OPENINGS FORMED THEREIN; AND A RESILIENT HINGE UNIT MADE OF A SINGLE PIECE OF SPRING METAL AND COMPRISING A PAIR OF END LEGS, EACH OF WHICH EXTENDS THROUGH A CORRESPONDING ONE OF SAID OPENINGS AND IS SECURED TO THE FRAME, A PAIR OF FIRST ARMS CONNECTED TO THE LEGS, EACH ARM BEING ANGULARLY DISPOSED RELATIVE TO A CORRESPONDING LEG, AND A LOOP MEMBER CONNECTED TO THE ENDS OF THE ARMS WHICH ARE REMOTE FROM THE LEGS, SAID LOOP MEMBER BEING OFFSET FROM THE ARMS AND PROJECTING TOWARD THE LEGS; THE FRAME, POLEPIECE, ARMATURE AND HINGE UNIT BEING SO CONSTRUCTED AND ARRANGED THAT THE LOOP MEMBER NORMALLY AND YIELDINGLY IMPARTS PIVOTAL MOVEMENT OF THE ARMATURE UNIT IN ONE DIRECTION RELATIVE TO THE FRAME WHEREBY THE ARMATURE IS POSITIONED AWAY FROM THE POLE, SAID ARMATURE UNIT, UPON ENERGIZATION OF THE COIL, BEING PIVOTED TO A REVERSE DIRECTION AGAINST THE ACTION OF THE LOOP MEMBER DUE TO THE ARMATURE BEING ATTRACTED TO THE POLE.