Electromagnetic actuator with translatory armature movement

Claim 1

AN ELECTROMAGNETIC TRANSDUCER COMPRSING, IN COMBINATION, A BASE MEMBER OF MAGNETIC MATERIAL HAVING FIRST, SECOND AND THIRD PROJECTIONS DEFINING A FIRST SLOT BETWEEN SAID FIRST AND THIRD PROJECTIONS AND A SECOND SLOT BETWEEN SAID SECOND AND THIRD PROJECTIONS, AN ARMATURE ASSEMBLY COMPRSING A FIRST ARMATURE BRIDGING SAID FIRST SLOT AND CLOSELY SPACED FROM SAID FIRST AND THIRD PROJECTIONS AND A SECOND ARMATURE BRIDGING SAID SECOND SLOT AND CLOSELY SPACED FROM SAID SECOND AND THIRD PROJECTIONS, SAID ARMATURES AND PROJECTIONS FORMING FIRST AND SECOND GAPS BETWEEN SAID FIRST ARMATURE AND SAID FIRST AND THIRD PROJECTIONS AND THIRD AND FOURTH GAPS BETWEEN SAID SECOND ARMATURE AND SAID SECOND AND THIRD PROJECTIONS, NONMAGNETIC MEANS MECHANICALLY COUPLING SAID ARMATURES WHEREBY THEY MOVE AS A SINGLE UNIT, MEANS FOR DIRECTING A FIRST MAGNETIC FIELD IN ONE DIRECTION THROUGH SAID FIRST AND SECOND GAPS AND IN THE OPPOSITE DIRECTION THROUGH SAID THIRD AND FOURTH GAPS AND MEANS FOR DIRECTING A SECOND MAGNETIC FIELD IN ONE DIRECTION THROUGH SAID SECOND AND THIRD GAPS AND IN THE DIRECTION OPPOSITE THERETO IN SAID FIRST AND FOURTH GAPS, SAID MEANS FOR DIRECTING SAID FIRST FIELD AND SAID MEANS FOR DIRECTING SAID SECOND FIELD BEING STATIONARY WITH RESPECT TO SAID BASE MEMBER.