Electromagnetic structures for electrical control devices

Claim 1

AN ELECTROMAGNETIC STRUCTURE COMPRISING A PAIR OF SUBSTANTIALLY PARALLEL, SPACED MAGNETIC PLATES, AT LEAST ONE OUTER MAGNETIC MEMBER DISPOSED TO EXTEND BETWEEN THE PLATES WITH A PREDETERMINED NON-MAGNETIC GAP BETWEEN EACH OUTER LEG MEMBER AND THE PLATES, A CENTRAL MAGNETIC LEG MEMBER EXTENDING FROM ONE PLATE TOWARD THE OTHER PLATE FOR ONLY A PORTION OF THE SPACING BETWEEN THE PLATES, SAID OTHER PLATE INCLUDING A CENTRAL OPENING SUBSTANTIALLY ALIGNED WITH THE CENTRAL LEG MEMBER, AN ARMATURE DISPOSED TO PASS THROUGH THE OPENING IN SAID OTHER PLATE AND TO MOVE RECIPROCALLY BETWEEN A FIRST POSITION IN WHICH ONE END OF THE ARMATURE IS DISPOSED ADJACENT TO THE CENTRAL LEG MEMBER AND A SECOND POSITION IN WHICH SAID ONE END IS SPACED AWAY FROM THE CENTRAL LEG MEMBER BY A PREDETERMINED NON-MAGNETIC GAP, MEANS FOR BIASING THE ARMATURE TOWARD THE SECOND POSITION, ONE OR MORE PERMANENT MAGNETIC MEMBERS DISPOSED TO EXTEND BETWEEN THE PLATES TO PROVIDE A MAGNETIC FLUX WHICH PASSES THROUGH THE ARMATURE AND THE CENTRAL LEG MEMBER TO LATCH THE ARMATURE IN THE FIRST POSITION, AND MEANS FOR ACTUATING THE ARMATURE BETWEEN THE FIRST AND SECOND POSITIONS INCLUDING COIL MEANS DISPOSED BETWEEN THE PLATES AROUND THE CENTRAL LEG MEMBER AND SAID ONE END OF THE ARMATURE, SAID COIL MEANS BEING ENERGIZABLE TO ACTUATE MOST OF THE MAGNETIC FLUX FROM THE PERMANENT MAGNETIC MEMBERS BETWEEN A FIRST PATH WHICH INCLUDES THE ARMATURE AND THE CENTRAL LEG MEMBER AND SECOND PATH WHICH INCLUDES THE OUTER LEG MEMBER.